EQUITY OFFICE PROPERTIES TRUST
S-4, 1997-11-18
REAL ESTATE INVESTMENT TRUSTS
Previous: MLCC MORT INV INC MORT LOAN ASST BK PASS THRU CERT SE 1997-A, 8-K, 1997-11-18
Next: EQUITY OFFICE PROPERTIES TRUST, S-4/A, 1997-11-18



<PAGE>   1
 
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 17, 1997
 
                                                     REGISTRATION NO. 333-
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                         ------------------------------
 
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                         ------------------------------
 
                       EOP OPERATING LIMITED PARTNERSHIP
      (Exact name of registrant as specified in its governing instrument)
 
<TABLE>
<S>                    <C>                    <C>
      DELAWARE                 6798                36-4156801
      (State of          (Primary Standard      (I.R.S. Employer
    Organization)           Industrial           Identification
                        Classification Code          Number)
                              Number)
</TABLE>
 
                         EQUITY OFFICE PROPERTIES TRUST
      (Exact name of registrant as specified in its governing instrument)
 
<TABLE>
<C>                    <C>                    <C>
      MARYLAND                 6798                36-4151656
      (State of          (Primary Standard      (I.R.S. Employer
     Organization)          Industrial           Identification
                        Classification Code          Number)
                              Number)
</TABLE>
 
                         ------------------------------
 
                     TWO NORTH RIVERSIDE PLAZA, SUITE 2200
                            CHICAGO, ILLINOIS 60606
                    (Address of principal executive offices)
 
                               STANLEY M. STEVENS
                              CHIEF LEGAL COUNSEL
                     TWO NORTH RIVERSIDE PLAZA, SUITE 2200
                            CHICAGO, ILLINOIS 60606
                    (Name and address of agent for service)
 
                         ------------------------------
 
                                   Copies to:
 
                             J. WARREN GORRELL, JR.
                                JAMES E. SHOWEN
                             HOGAN & HARTSON L.L.P.
                          555 THIRTEENTH STREET, N.W.
                          WASHINGTON, D.C. 20004-1109
                                 (202) 637-5600
                             GILBERT G. MENNA, P.C.
                               KATHRYN I. MURTAGH
                          GOODWIN, PROCTER & HOAR LLP
                                 EXCHANGE PLACE
                        BOSTON, MASSACHUSETTS 02109-2881
                                 (617) 570-1000
 
                         ------------------------------
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.
    If the securities being registered on this form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  [ ]
    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]
    If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
 
                         ------------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
=================================================================================================================================
                                                                PROPOSED MAXIMUM       PROPOSED MAXIMUM          AMOUNT OF
             TITLE OF CLASS                 AMOUNT BEING         OFFERING PRICE       AGGREGATE OFFERING        REGISTRATION
     OF SECURITIES BEING REGISTERED         REGISTERED(1)           PER UNIT               PRICE(2)                FEE(3)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                 <C>                    <C>                    <C>
Class A Units of Limited Partnership
  Interest(4)...........................      9,758,175             $29.7767             $290,566,438             $88,051
=================================================================================================================================
</TABLE>
 
(1) This Registration Statement covers the maximum number of Units of the
    registrant that are expected to be issued in connection with the
    transactions described herein.
(2) Determined pursuant to Rule 457(f)(l). (Based on the average high and low
    prices reported on the New York Stock Exchange as of November 12, 1997, for
    the Common Stock, $.01 par value per share, of Beacon Properties
    Corporation.)
(3) Includes $64,387 previously paid by the registrant as computed per Exchange
    Act Rules 14(a)-6(i)(l) and 0-11.
(4) The Class A Units of Limited Partnership of EOP Operating Limited
    Partnership are redeemable on a one-for-one basis for common shares of
    beneficial interest, $.01 par value per share, of Equity Office Properties
    Trust (the "Common Shares"), which Common Shares also are being registered
    herewith, as well as any Common Shares issuable in respect of distributions,
    share splits or recapitalizations relating thereto.
 
                         ------------------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
                           PROXY STATEMENT/PROSPECTUS
 
                    BEACON PROPERTIES, L.P. SPECIAL MEETING
                        TO BE HELD ON DECEMBER 19, 1997
 
                       EOP OPERATING LIMITED PARTNERSHIP
                 CLASS A UNITS OF LIMITED PARTNERSHIP INTEREST
 
    This Proxy Statement/Prospectus is being furnished to holders of units of
limited partnership interest ("Beacon Unitholders") of Beacon Properties, L.P.,
a Delaware limited partnership ("Beacon Partnership"), in connection with the
solicitation of proxies by Beacon Properties Corporation, a Maryland corporation
(together with its subsidiaries, "Beacon"), as the sole general partner of
Beacon Partnership, for use at a Special Meeting of Unitholders of Beacon
Partnership (including any adjournments or postponements thereof) (the "Beacon
Partnership Special Meeting") to be held on Friday, December 19, 1997 at the
time and place set forth in the accompanying notice.
 
    The purpose of the Beacon Partnership Special Meeting is to consider and
vote upon an Agreement and Plan of Merger, dated as of September 15, 1997, as
amended (the "Agreement"), among Equity Office Properties Trust, a Maryland real
estate investment trust (together with its subsidiaries, "EOP"), EOP Operating
Limited Partnership, a Delaware limited partnership ("EOP Partnership"), Beacon
and Beacon Partnership, and related matters. The Agreement is attached to this
Proxy Statement/Prospectus as Annex I.
 
    The Agreement provides for a merger of Beacon Partnership with and into EOP
Partnership (or a limited liability company or limited partnership wholly owned
directly or indirectly by EOP Partnership) (the "Partnership Merger") and a
merger of Beacon with and into EOP (the "Company Merger" and, together with the
Partnership Merger, the "Mergers"). At the effective time of the Mergers, (i)
each common partnership unit of Beacon Partnership ("Beacon Partnership Unit")
will be converted into the right to receive 1.4063 Class A Units of EOP
Partnership ("EOP Partnership Units") with cash in lieu of the issuance of any
fractional interests, (ii) each 8.98% Series A Preferred Unit of Beacon
Partnership ("Beacon Preferred Unit") will be converted into the right to
receive one 8.98% Series A Preferred Unit of EOP Partnership ("EOP Preferred
Unit"), (iii) each outstanding share of common stock, $0.01 par value per share,
of Beacon ("Beacon Common Shares") will be converted into the right to receive
1.4063 common shares of beneficial interest, $0.01 par value per share, of EOP
("EOP Common Shares") with cash in lieu of the issuance of any fractional
interests, and (iv) each share of 8.98% Series A Cumulative Redeemable Preferred
Stock, liquidation preference $25.00 per share, of Beacon ("Beacon Preferred
Shares") will be converted into the right to receive one 8.98% Series A
Cumulative Redeemable Preferred Share, liquidation preference $25.00 per share,
of EOP ("EOP Preferred Shares"). As of November 12, 1997, there were 6,938,900
Beacon Partnership Units (excluding those held by Beacon), 8,000,000 Beacon
Preferred Units (all of which are held by Beacon), 56,267,567 Beacon Common
Shares and 8,000,000 Beacon Preferred Shares outstanding.
 
    Based on the closing price of EOP Common Shares on the New York Stock
Exchange (the "NYSE") of $30 7/16 per share on November 12, 1997, if the
Agreement is approved and the Mergers are consummated, the total market value of
EOP and EOP Partnership would be approximately $8.5 billion. Based on the number
of EOP Common Shares and Beacon Common Shares outstanding on that date,
approximately 33% of the EOP Common Shares expected to be outstanding after the
Mergers would be issued to Beacon Shareholders and approximately 28% of the EOP
Partnership Units expected to be outstanding immediately after the Mergers
(other than EOP Partnership Units held by EOP) would be issued to Beacon
Unitholders. Based on the exchange ratio and the closing price of EOP Common
Shares on the NYSE on November 12, 1997, each Beacon Unitholder would receive in
the Partnership Merger EOP Partnership Units worth $42.80 for each Beacon
Partnership Unit owned on that date (as implied by the value of the EOP Common
Shares). For a description of the Mergers and the Agreement, see "THE MERGERS."
 
    This Proxy Statement/Prospectus also constitutes a prospectus of EOP
Partnership in respect of the EOP Partnership Units to be issued to Beacon
Unitholders in the Partnership Merger. The EOP Partnership Units offered hereby
will be redeemable for EOP Common Shares, or, at EOP's option, cash equal to the
fair market value of such EOP Common Shares. The outstanding EOP Common Shares
are, and the shares for which the EOP Partnership Units offered hereby may be
exchanged will be, listed on the NYSE and traded under the symbol "EOP."
 
    This Proxy Statement/Prospectus and the accompanying proxy cards are first
being mailed to Beacon Unitholders on or about November 21, 1997.
 
     FOR CERTAIN FACTORS WHICH SHOULD BE CONSIDERED IN EVALUATING THE AGREEMENT
AND THE TRANSACTIONS CONTEMPLATED THEREBY, INCLUDING THE PARTNERSHIP MERGER, SEE
"RISK FACTORS" BEGINNING ON PAGE 18. SUCH MATTERS INCLUDE:
 
    - Possible changes in the value of EOP Partnership Units and Beacon
     Partnership Units, as reflected in the market prices of EOP Common Shares
     and Beacon Common Shares, prior to the time the Mergers become effective.
    - Reduction in distributions per unit to Beacon Unitholders after the
     Mergers.
    - Possible failure of EOP to manage rapid growth after the Mergers.
    - Conflicts of interest due to the fact that certain members of the Beacon
     Board and management of Beacon have interests that are different from, or
     in addition to, the interests of Beacon Unitholders generally.
    - Possible payment of a break-up fee and payment by Beacon or EOP of
     expenses if the Mergers are not consummated.
    - Beacon Unitholders do not have appraisal rights in connection with the
     Mergers under Delaware law.
                            ------------------------
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
 ACCURACY OR ADEQUACY OF THIS PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO
                      THE CONTRARY IS A CRIMINAL OFFENSE.
 
THE ATTORNEY GENERAL OF THE STATE OF NEW YORK HAS NOT PASSED ON OR ENDORSED THE
    MERITS OF THIS OFFERING. ANY REPRESENTATION TO THE CONTRARY IS UNLAWFUL.
                            ------------------------
 
       The date of this Proxy Statement/Prospectus is November   , 1997.
<PAGE>   3
 
                             AVAILABLE INFORMATION
 
     Beacon Partnership is, and both EOP and Beacon are, subject to the
informational requirements of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), and, in accordance therewith, file reports, proxy
statements and other information with the Securities and Exchange Commission
(the "Commission"). Such reports, proxy statements and other information filed
by EOP and Beacon with the Commission can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at its Regional Offices at Suite 1400,
500 West Madison Street, Chicago, Illinois 60661 and Suite 1300, 7 World Trade
Center, New York, New York 10005. Copies of such material can be obtained from
the Public Reference Section of the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549, upon payment of the prescribed fees. The Commission
maintains a Web site that contains reports, proxy and information statements and
other information regarding EOP and Beacon and other registrants that have been
filed electronically with the Commission. The address of such site is
http://www.sec.gov. In addition, the EOP Common Shares, the Beacon Common Shares
and the Beacon Preferred Shares are listed on the New York Stock Exchange (the
"NYSE"), and reports and other information filed by EOP and Beacon with the NYSE
can be inspected and copied at the NYSE, 20 Broad Street, New York, New York
10005.
 
     This Proxy Statement/Prospectus is part of a registration statement on Form
S-4 (together with all amendments and exhibits, the "Registration Statement")
filed by EOP Partnership with the Commission under the Securities Act of 1933,
as amended (the "Securities Act"). This Proxy Statement/Prospectus does not
contain all of the information set forth in the Registration Statement, certain
parts of which are omitted in accordance with the rules of the Commission. For
further information, reference is made to the Registration Statement.
 
     All information contained in this Proxy Statement/Prospectus with respect
to EOP, EOP Partnership and EOP's subsidiaries has been supplied by EOP, and all
information with respect to Beacon, Beacon Partnership and Beacon's subsidiaries
has been supplied by Beacon.
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION OTHER THAN AS CONTAINED HEREIN IN CONNECTION WITH THE OFFER
CONTAINED IN THIS PROXY STATEMENT/PROSPECTUS, AND IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON. THIS PROXY
STATEMENT/PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF
AN OFFER TO BUY ANY SECURITIES OTHER THAN THE SECURITIES TO WHICH IT RELATES,
NOR DOES IT CONSTITUTE AN OFFER TO OR SOLICITATION OF ANY PERSON IN ANY
JURISDICTION TO WHOM IT WOULD BE UNLAWFUL TO MAKE SUCH AN OFFER OR SOLICITATION.
THE DELIVERY OF THIS PROXY STATEMENT/PROSPECTUS AT ANY TIME DOES NOT IMPLY THAT
THE INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
     Information contained in or delivered in connection with this Proxy
Statement/Prospectus contains "forward-looking statements" relating to, without
limitation, future economic performance, plans and objectives of management for
future operations and projections of revenue and other financial items, which
can be identified by the use of forward-looking terminology such as "may,"
"will," "should," "expect," "anticipate," "estimate" or "continue" or the
negative thereof or other variations thereon or comparable terminology. The
cautionary statements set forth under the caption "RISK FACTORS" and elsewhere
in this Proxy Statement/Prospectus identify important factors with respect to
such forward-looking statements, including certain risks and uncertainties, that
could cause actual results to differ materially from those in such
forward-looking statements, including, but not limited to, the timely
consummation of the Mergers, EOP's ability to successfully manage rapid growth
(including that resulting from the Mergers), general economic conditions,
financial and capital market conditions, local real estate conditions, the
timely reletting of occupied square footage upon expiration of leases, the
timely acquisition of additional income-producing properties and development
sites, and the timely development and lease-up of other properties.
<PAGE>   4
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
SUMMARY.....................................................    1
  Parties to the Agreement..................................    1
  Terms of the Merger; Exchange Ratio.......................    2
  Unitholder Meeting........................................    2
  Record Dates; Vote Required...............................    2
  Approval of Company Merger................................    3
  Approval by Preferred Shareholders........................    3
  Recommendation of Beacon Board............................    3
  Opinion of Beacon Financial Advisor.......................    4
  Effective Time of the Mergers.............................    5
  Trustees, Management and Headquarters After the Mergers...    5
  Conditions to Consummation of the Mergers.................    5
  Anticipated Accounting Treatment..........................    5
  Conduct of Business Pending the Mergers...................    5
  Summary Risk Factors......................................    6
  Interests of Certain Persons in the Mergers...............    8
  Federal Income Tax Consequences of the Partnership
     Merger.................................................    8
  Federal Income Tax Classification of EOP Partnership and
     EOP....................................................    8
  Resales of EOP Partnership Units, EOP Common Shares and
     EOP Preferred Shares...................................    9
  Termination...............................................    9
  Break-Up Fees.............................................    9
  Acquisition of Beacon Service Companies...................    9
  Equivalent Per Unit Data..................................   10
  Market Prices of Common Shares............................   11
  Distribution Policy.......................................   11
SUMMARY UNAUDITED PRO FORMA COMBINED FINANCIAL DATA.........   12
EOP PARTNERSHIP SUMMARY SELECTED CONSOLIDATED AND COMBINED
  FINANCIAL DATA............................................   13
BEACON PARTNERSHIP SUMMARY SELECTED COMBINED FINANCIAL
  DATA......................................................   15
RISK FACTORS................................................   17
  Unit Value Fluctuations Through the Effective Time........   17
  Unit Value Fluctuations After the Effective Time..........   17
  Failure to Effectively Manage Rapid Growth; Expansion into
     New Markets............................................   17
  Reductions in Distributions Per Unit for Beacon
     Unitholders After the Mergers..........................   17
  Conflicts of Interest Arising from Benefits to Certain
     Directors and Officers of Beacon.......................   18
  Limited Control over Business of EOP Partnership..........   18
  Risks of Ownership of EOP Partnership Units...............   19
  Issuance of Preferred Units...............................   19
  No Appraisal Rights in Connection with the Partnership
     Merger.................................................   19
  Payments if the Agreement Is Terminated...................   19
  Possibility That the Expected Benefits of Mergers Will Not
     Be Realized............................................   20
  Real Estate Risks.........................................   20
  Debt Financing............................................   22
  Concentration of Properties in Certain Markets............   23
  Federal Income Tax Risks..................................   23
  Limitations on Changes in Control and of Ownership
     Limit..................................................   26
  Managed Property Business and Non-REIT Services...........   28
  Conflicts of Interest in Connection with Formation and
     Business of EOP........................................   29
  Possible Environmental Liabilities........................   30
  Ownership of EOP Common Shares............................   32
  Dependence on Key Personnel...............................   33
  Contingent or Undisclosed Liabilities.....................   33
</TABLE>
 
                                        i
<PAGE>   5
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
THE BEACON PARTNERSHIP SPECIAL MEETING......................   34
  General...................................................   34
  Voting and Revocation of Proxies..........................   34
  Solicitation of Proxies...................................   34
  Vote Required.............................................   35
  Recommendation............................................   35
  Other Matters.............................................   35
THE MERGERS.................................................   35
  Background of and Reasons for the Mergers.................   36
  Opinion of Beacon Financial Advisor.......................   41
  Effective Time of the Mergers.............................   47
  Exchange Ratios and Exchange of EOP Common Shares, EOP
     Preferred Shares and EOP Partnership Units.............   47
  Distributions.............................................   48
  Effect of Mergers on the Declaration of Trust and the EOP
     Bylaws and Agreement of Limited Partnership............   49
  Headquarters..............................................   49
  Trustees and Management...................................   49
  Conditions to Consummation of the Mergers.................   49
  Representations and Warranties............................   50
  Conduct of Business Pending the Mergers...................   51
  No Solicitation...........................................   55
  Certain Other Covenants...................................   56
  Termination, Extension, Amendment and Waiver..............   57
  Fees and Expenses.........................................   59
  Assumption of Beacon's Obligations Under Registration
     Rights Agreements......................................   60
  Interests of Certain Persons in the Mergers...............   61
  Anticipated Accounting Treatment..........................   64
  Resales of EOP Partnership Units, EOP Common Shares and
     EOP Preferred Shares...................................   64
  Other Related Transactions................................   65
APPRAISAL RIGHTS............................................   66
BUSINESS OF EOP.............................................   67
  General...................................................   67
  Distribution of EOP Office Properties, Managed Properties
     and Parking Facilities by Region (as of September 30,
     1997)..................................................   68
  Operations................................................   68
  Operational Structure.....................................   68
  Formation Transactions....................................   69
  Recent Developments.......................................   70
  Business and Growth Strategies............................   71
  Price Range of EOP Common Shares and Distribution
     History................................................   73
EOP PARTNERSHIP SELECTED CONSOLIDATED AND COMBINED FINANCIAL
  DATA......................................................   74
EOP PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF
  FINANCIAL CONDITION AND RESULTS OF OPERATIONS.............   76
  Overview..................................................   76
  General...................................................   76
  Results of Operations.....................................   77
  Parking Operations........................................   81
  Parking Facilities........................................   87
  Dispositions of Property..................................   87
  Liquidity and Capital Resources...........................   88
  Cash Flows................................................   91
  Capital Improvements......................................   92
  Tenant Improvements and Leasing Commission Costs..........   92
  Inflation.................................................   93
</TABLE>
 
                                       ii
<PAGE>   6
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Funds from Operations.....................................   94
THE EOP PROPERTIES..........................................   96
  General...................................................   96
  EOP Office Properties by Region...........................   96
  EOP Office Property Market Sectors and Submarkets -- EOP
     Office Property Statistics.............................   97
  EOP Parking Facilities....................................  110
  Tenants...................................................  110
  Lease Expiration by Region................................  111
  Lease Expirations -- Total Portfolio......................  113
  Lease Distributions.......................................  114
  Capital Improvements......................................  114
  Tenant Improvement and Leasing Commission Costs...........  114
  Occupancy.................................................  116
  Debt Financing............................................  116
  Realty Taxes..............................................  116
  Legal Proceedings.........................................  116
BUSINESS OF BEACON..........................................  117
  General...................................................  117
  Operations................................................  117
  Operational Structure.....................................  117
  Recent Developments.......................................  117
BEACON PARTNERSHIP SELECTED COMBINED FINANCIAL
  INFORMATION...............................................  119
BEACON PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF
  FINANCIAL CONDITION AND RESULTS OF OPERATIONS.............  123
  Overview..................................................  123
  Results of Operations.....................................  123
  Liquidity and Capital Resources...........................  127
  Investing Activities......................................  127
  Financing Activities......................................  128
  Capitalization............................................  129
  Environmental Matters.....................................  130
  Inflation.................................................  130
THE BEACON PROPERTIES.......................................  131
  Lease Expirations.........................................  134
  Mortgage Indebtedness and Credit Facility.................  136
MARKETS AND COMPETITION OF EOP AND BEACON...................  137
MANAGEMENT..................................................  143
  Trustees and Executive and Senior Officers of EOP.........  143
  Committees of the EOP Board...............................  148
  Compensation of the EOP Board; Payment in EOP Common
     Shares.................................................  148
  Executive Compensation....................................  149
  Option and Restricted Share Plan..........................  150
  401(k) Plan...............................................  150
  Supplemental Retirement Savings Plan......................  150
  Employee Share Purchase Plan..............................  150
  Incentive Compensation....................................  151
  Limitation of Liability and Indemnification...............  151
CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS..............  152
  Sale of EOP Common Shares to Mr. Zell.....................  152
  Leases and Parking Operations.............................  152
  Equity Group Distributions and Fees.......................  153
  Miscellaneous.............................................  153
EOP PARTNERSHIP POLICIES WITH RESPECT TO CERTAIN
  ACTIVITIES................................................  154
  Investment Policies.......................................  154
  Financing Policies........................................  155
  Lending Policies..........................................  155
</TABLE>
 
                                       iii
<PAGE>   7
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Conflict of Interest Policies.............................  155
  Policies with Respect to Other Activities.................  156
EOP PARTNERSHIP AGREEMENT AND UNITS OF PARTNERSHIP
  INTEREST..................................................  156
  Capitalization............................................  157
  Issuance of Additional Partnership Interests..............  157
  Capital Contributions.....................................  157
  Distributions.............................................  157
  Preemptive Rights.........................................  158
  Liquidation Preferences...................................  158
  Conversion or Redemption of Partnership Interests.........  158
  Management................................................  159
  Reimbursement of EOP; Transactions with EOP and Its
     Affiliates.............................................  160
  Sales of Substantially All of the Assets of EOP
     Partnership............................................  160
  Indemnification...........................................  160
  Transfer or Pledge of Partnership Interests...............  161
  Amendment of the Partnership Agreement....................  161
  Meetings..................................................  162
  Financial Statements and Reports..........................  162
  Term......................................................  163
COMPARATIVE RIGHTS OF UNITHOLDERS...........................  163
  Capitalization............................................  163
  Issuance of Additional Partnership Interests..............  163
  Capital Contributions.....................................  164
  Distributions.............................................  165
  Preemptive Rights.........................................  165
  Conversion; Redemption....................................  166
  Management................................................  167
  Sale of Substantially All of Partnership Assets...........  168
  Indemnification...........................................  168
  Transfer or Pledge of Units...............................  169
  Amendment of Partnership Agreement........................  170
  Meetings..................................................  171
  Financial Statements and Reports..........................  172
CERTAIN PROVISIONS OF MARYLAND LAW AND EOP'S DECLARATION OF
  TRUST AND BYLAWS..........................................  173
  Classification and Removal of Board of Trustees; Other
     Provisions.............................................  173
  Changes in Control Pursuant to Maryland Law...............  173
  Amendments to the Declaration of Trust....................  174
  Advance Notice of Trustee Nominations and New Business....  175
  Anti-Takeover Effect of Certain Provisions of Maryland Law
     and of the Declaration of Trust and the EOP Bylaws.....  175
  Maryland REIT Law Asset Requirements......................  175
SHARES OF BENEFICIAL INTEREST...............................  176
  General...................................................  176
  EOP Common Shares.........................................  176
  Preferred Shares..........................................  177
  EOP Preferred Shares......................................  177
  Power to Issue Additional EOP Common Shares and Preferred
     Shares.................................................  179
  Restrictions on Ownership and Transfer....................  180
  Transfer Agent and Registrar..............................  181
COMPARATIVE RIGHTS OF SHAREHOLDERS..........................  182
  Capitalization............................................  182
  Voting Rights.............................................  183
  Trustees/Directors........................................  184
  Anti-Takeover Provisions..................................  186
  REIT Qualification Provisions.............................  187
</TABLE>
 
                                       iv
<PAGE>   8
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Preemptive Rights.........................................  190
  Assessment................................................  191
  Conversion; Redemption; Sinking Fund......................  191
  Liquidation Rights........................................  192
  Distributions.............................................  193
  Shareholder Meetings......................................  194
  Indemnification...........................................  196
  Trustee and Director Liability............................  198
  Amendments to Constituent Documents.......................  198
  Mergers; Consolidations; Sales of Assets..................  199
  Character of Assets and Business..........................  199
FEDERAL INCOME TAX CONSIDERATIONS...........................  199
  General...................................................  199
  Summary...................................................  200
  Tax Status of EOP Partnership.............................  201
  Tax Consequences of the Partnership Merger................  202
  Effect of Subsequent Events...............................  207
  Tax Treatment of Partners Who Hold EOP Partnership Units
     After the Partnership Merger...........................  209
  Taxation of EOP as a REIT -- General......................  215
  Requirements for Qualification as a REIT..................  217
  Taxation of Taxable U.S. Shareholders of EOP Generally....  224
  Backup Withholding for EOP Distributions..................  226
  Taxation of Tax-Exempt Shareholders of EOP................  226
  Taxation of Non-U.S. Shareholders of EOP..................  227
  Tax Aspects of EOP's Ownership of Interests in the ZML
     Opportunity Partnerships and EOP Partnership...........  229
  Other Tax Consequences for EOP, Its Shareholders and the
     Third-Party Service Corporations.......................  230
ERISA CONSIDERATIONS........................................  230
  Status of EOP and EOP Partnership Under ERISA.............  230
EXPERTS.....................................................  232
LEGAL MATTERS...............................................  232
OTHER MATTERS...............................................  233
GLOSSARY....................................................  234
INDEX TO FINANCIAL STATEMENTS...............................  F-1
ANNEX I  Agreement and Plan of Merger dated September 15,
  1997, as amended
ANNEX II Opinion of Morgan Stanley & Co. Incorporated
</TABLE>
 
                                        v
<PAGE>   9
 
                                    SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information included elsewhere in this Proxy Statement/Prospectus. As used
herein, "EOP" means Equity Office Properties Trust, a Maryland real estate
investment trust, and one or more of its Subsidiaries (including EOP Operating
Limited Partnership, a Delaware limited partnership ("EOP Partnership")), and
the predecessors thereof or, when describing the Mergers or otherwise as the
context may require, Equity Office Properties Trust only or EOP Partnership
only. As used herein, "Beacon" means Beacon Properties Corporation, a Maryland
corporation and one or more of its subsidiaries (including Beacon Properties,
L.P., a Delaware limited partnership ("Beacon Partnership")), or, when
describing the Mergers or otherwise as the context may require, Beacon
Properties Corporation only or Beacon Partnership only. See "GLOSSARY" for the
meanings of other terms used herein. All references herein to the value of the
EOP Partnership Units or the Beacon Partnership Units assume the value of one
EOP Partnership Unit or Beacon Partnership Unit is equal to the value of one EOP
Common Share or Beacon Common Share, respectively. Unless otherwise required by
the context, all rental and square footage data is approximate and/or on a
weighted average basis and all property information is presented as of September
30, 1997. All references to the historical activities of EOP prior to July 11,
1997 refer to the activities of the EOP Predecessors.
 
PARTIES TO THE AGREEMENT
 
     EOP AND EOP PARTNERSHIP.  EOP is a fully integrated, self-administered and
self-managed real estate investment trust ("REIT") engaged in owning and
operating institutional quality office buildings and providing a superior level
of service to tenants in central business districts ("CBDs") and suburban
markets across the United States. Institutional quality office buildings
generally are considered to be those that have excellent locations and access,
attract high quality tenants, are well maintained and professionally managed,
and achieve among the highest rent, occupancy and tenant retention rates within
their markets. EOP completed its initial public offering in July 1997. As of
September 30, 1997, EOP owned or had an interest in 93 office properties
containing approximately 33.4 million rentable square feet of office space (the
"EOP Office Properties") and owned 16 stand-alone parking facilities containing
approximately 16,037 parking spaces (the "EOP Parking Facilities" and, together
with the EOP Office Properties, the "EOP Properties"). The EOP Properties are
located in 48 submarkets in 35 markets in 20 states and the District of
Columbia. The EOP Office Properties, by rentable square feet, are located 53% in
CBDs and 49% in suburban markets. As of September 30, 1997, the EOP Office
Properties were, on a weighted average basis, 93.2% occupied by 3,099 tenants,
with no single tenant accounting for more than 2.3% of annualized rent. An
additional 556,000 square feet (approximately 1.7% of the rentable square
footage of the EOP Office Properties) were leased, with occupancy yet to
commence. Since September 30, 1997, EOP has acquired an additional 21 office
properties containing approximately 6.4 million rentable square feet of office
space, thereby increasing the size of its portfolio to 114 office properties
containing approximately 39.8 million rentable square feet.
 
     All of EOP's assets are owned by, and its operations conducted through, EOP
Partnership and its Subsidiaries. EOP is the managing general partner of EOP
Partnership.
 
     EOP's and EOP Partnership's principal executive offices are located at Two
North Riverside Plaza, 22nd Floor, Chicago, Illinois 60606, and the telephone
number is (312) 466-3300. For further information concerning EOP and EOP
Partnership, see "BUSINESS OF EOP."
 
     BEACON AND BEACON PARTNERSHIP.  Beacon is a fully integrated,
self-administered and self-managed REIT engaged in owning and operating
institutional quality office buildings and certain retail buildings located in
CBDs and suburban markets, including Boston, Atlanta, Chicago, Los Angeles, San
Francisco and Washington, D.C. As of the date hereof, Beacon owns or has an
interest in 126 income producing properties containing approximately 20.7
million rentable square feet of office space (the "Beacon Properties" and,
together with the EOP Properties, the "Properties"). The Beacon Properties are
located in 10 submarkets in six markets in five states and the District of
Columbia. The Beacon Properties, by rentable square feet, are located 68% in
suburban markets and 32% in CBDs, primarily Boston and suburban Boston. As of
September 30, 1997, the Beacon Properties were on a weighted average basis
approximately 97% leased by a total of approximately 1,280 tenants, with no
single tenant accounting for more than 4.0% of annualized rent.
 
                                        1
<PAGE>   10
 
     All of Beacon's assets are owned by, and its operations conducted through,
Beacon Partnership and its Subsidiaries. Beacon is the sole general partner of
Beacon Partnership.
 
     Beacon's and Beacon Partnership's principal executive offices are located
at 50 Rowes Wharf, Boston, Massachusetts 02110, and their telephone number is
(617) 330-1400. For further information concerning Beacon and Beacon
Partnership, see "BUSINESS OF BEACON."
 
TERMS OF THE MERGER; EXCHANGE RATIO
 
     The Agreement provides for a merger of Beacon with and into EOP (the
"Company Merger") and a merger of Beacon Partnership with and into EOP
Partnership (or into a limited liability company or limited partnership wholly
owned, directly or indirectly, by EOP Partnership) (the "Partnership Merger"
and, together with the Company Merger, the "Mergers"). At the Effective Time,
(i) each common partnership unit of Beacon Partnership ("Beacon Partnership
Unit") will be converted into the right to receive 1.4063 Class A Units of EOP
Partnership ("EOP Partnership Units"), with cash in lieu of the issuance of any
fractional interests, (ii) each 8.98% Series A Preferred Unit of Beacon
Partnership ("Beacon Preferred Unit") will be converted into the right to
receive one 8.98% Series A Preferred Unit of EOP Partnership ("EOP Preferred
Unit"), (iii) each outstanding share of common stock, $0.01 par value per share,
of Beacon ("Beacon Common Share") will be converted into the right to receive
1.4063 common shares of beneficial interest, $0.01 par value per share, of EOP
("EOP Common Shares"), with cash in lieu of the issuance of any fractional
interests, and (iv) each share of 8.98% Series A Cumulative Redeemable Preferred
Stock, liquidation preference $25.00 per share, of Beacon ("Beacon Preferred
Share") will be converted into the right to receive one 8.98% Series A
Cumulative Redeemable Preferred Share, liquidation preference $25.00 per share,
of EOP ("EOP Preferred Share"). As of November 12, 1997, there were 6,938,900
Beacon Partnership Units (excluding those held by Beacon), 8,000,000 Beacon
Preferred Units (all of which are held by Beacon), 56,267,567 Beacon Common
Shares and 8,000,000 Beacon Preferred Shares outstanding.
 
     Following the Mergers, each EOP Partnership Unit received by Beacon
Unitholders in the Partnership Merger will be redeemable for one EOP Common
Share or, at EOP's option, the cash equivalent thereof.
 
UNITHOLDER MEETING
 
     The Beacon Partnership Special Meeting will be held on Friday, December 19,
1997 at 9:30 a.m., Boston time, at State Street Bank, 225 Franklin Street,
Boston, Massachusetts. The purpose of the Beacon Partnership Special Meeting is
to consider and vote upon proposals to approve the Partnership Merger, the
Agreement and certain other transactions contemplated thereby. See "THE BEACON
PARTNERSHIP SPECIAL MEETING."
 
RECORD DATES; VOTE REQUIRED
 
     Only holders of Beacon Partnership Units of record admitted as limited
partners of Beacon Partnership at the close of business on November 14, 1997
(the "Beacon Partnership Record Date") will be entitled to vote at the Beacon
Partnership Special Meeting. The affirmative vote of the holders of 85% of the
Beacon Partnership Units (including those held by Beacon) is required to approve
the Partnership Merger. Beacon owns approximately 89% of the Beacon Partnership
Units and intends to vote in favor of the Partnership Merger. In addition, the
affirmative vote of holders of a majority of the Beacon Partnership Units (other
than those held by Beacon) is required to approve the transfer of Beacon
Partnership Units held by Beacon and its withdrawal as general partner of Beacon
Partnership pursuant to the Company Merger. As of the Beacon Partnership Record
Date, there were 6,938,900 Beacon Partnership Units (other than those held by
Beacon) outstanding and entitled to vote.
 
     Certain members of the Beacon Board, their families and trusts and
partnerships established for their benefit have entered into a voting agreement
(the "Beacon Voting Agreement") pursuant to which such persons and entities,
holding in the aggregate 2,571,618 Beacon Partnership Units or approximately
3.6% of the outstanding Beacon Partnership Units not held by Beacon, have
agreed, among other things, to vote such Beacon Partnership Units to approve the
Agreement, the Partnership Merger, the transfer of Beacon
 
                                        2
<PAGE>   11
 
Partnership Units held by Beacon and its withdrawal as general partner of Beacon
Partnership and any other matters which require the consent of Beacon
Unitholders in connection with the transactions contemplated by the Agreement.
 
     The Partnership Merger does not require approval by the EOP Unitholders
other than EOP.
 
APPROVAL OF COMPANY MERGER
 
     By separate Joint Proxy Statement/Prospectus, the Beacon Board and the EOP
Board are soliciting the approval of the Company Merger, the Agreement and the
other transactions contemplated thereby from the Beacon Shareholders and the EOP
Shareholders, respectively. Such Joint Proxy Statement/Prospectus also
constitutes a Prospectus of EOP with regard to the EOP Common Shares to be
issued to the Beacon Shareholders in connection with the Company Merger. The
Company Merger requires the affirmative vote of Beacon Shareholders holding
two-thirds of the outstanding Beacon Common Shares entitled to vote on the
matter at the Beacon Special Meeting and the affirmative vote of EOP
Shareholders holding a majority of all the EOP Common Shares entitled to vote on
the matter at the EOP Special Meeting. The consummation of the Company Merger is
conditioned upon consummation of the Partnership Merger, and the Partnership
Merger will not be consummated if the Company Merger does not receive the
required approval by Beacon Shareholders and EOP Shareholders.
 
APPROVAL BY PREFERRED SHAREHOLDERS
 
     By separate Proxy Statement/Prospectus, the Beacon Board is soliciting
proxies from the holders of Beacon Preferred Shares (the "Beacon Preferred
Shareholders") for use at a special meeting of such shareholders. The Beacon
Preferred Shareholders are being asked to consider and vote upon a proposal to
approve the Merger, the Agreement and the transactions contemplated thereby,
including the conversion of the Beacon Preferred Shares into EOP Preferred
Shares pursuant to the Merger. The Merger and the Agreement must be approved by
the affirmative vote of the holders of two-thirds of all Beacon Preferred Shares
entitled to vote. The consummation of the Merger is conditioned upon receiving
the required approval of the Beacon Preferred Shareholders. The separate Proxy
Statement/Prospectus relating to the special meeting of Beacon Preferred
Shareholders also constitutes a Prospectus of EOP with regard to the EOP
Preferred Shares to be issued to the Beacon Preferred Shareholders pursuant to
the Merger.
 
RECOMMENDATION OF BEACON BOARD
 
     The Beacon Board on behalf of Beacon, in its capacity as general partner of
Beacon Partnership, has unanimously approved the Mergers, the Agreement and the
transactions contemplated thereby, including the transfer of Beacon Partnership
Units by Beacon and its withdrawal as general partner of Beacon Partnership. The
Beacon Board believes that the Mergers, the Agreement and the transactions
completed thereby are fair to, and in the best interests of, Beacon, Beacon
Partnership and their respective security holders.
 
     In reaching its determination, the Beacon Board consulted with Beacon
management, as well as its financial advisors, legal counsel and accountants and
considered the short-term and long-term interests of Beacon, Beacon Partnership
and their respective security holders. In particular, the Beacon Board
considered the following material factors, all of which it deemed favorable: (a)
the value of the consideration to be received by the Beacon Unitholders in the
Partnership Merger would result in a premium as compared to the historical and
recent value of the Beacon Partnership Units as implied by historical and recent
market prices of Beacon Common Shares; (b) the Partnership Merger provides an
opportunity for Beacon Unitholders to become equity holders in the operating
partnership subsidiary of the largest publicly traded owner and operator of
office properties in the nation, with one of the strongest management teams in
the industry and a combined asset portfolio that will be more geographically
diversified than Beacon's current portfolio; (c) the Mergers would provide
increased market capitalization which likely would result in higher trading
volumes for the EOP Common Shares and enhanced liquidity for EOP Shareholders,
including EOP Unitholders who receive EOP Common Shares upon redemption of their
Units; (d) the Mergers likely would provide cost savings and
 
                                        3
<PAGE>   12
 
operating efficiencies to the surviving company; (e) the Partnership Merger is a
"unit-for-unit" rather than a "cash-for-unit" transaction and, thus, will
provide Beacon Unitholders with an opportunity to share in any future
appreciation of EOP Partnership Units and will allow Beacon Unitholders to
convert their Beacon Partnership Units into EOP Partnership Units while
deferring at least a substantial portion of the taxable gain that otherwise
would be recognized in a cash transaction; (f) the Agreement permits the Beacon
Board to continue to receive unsolicited inquiries and proposals concerning
other potential business combinations and to enter into discussions or
negotiations concerning such combinations with third parties to the extent
required by the fiduciary duties of the Beacon Board, and to terminate the
Agreement upon payment to EOP of the Break-Up Fee of up to $75 million if the
Beacon Board, in the exercise of its fiduciary duties, withdraws or amends in
any manner adverse to EOP its approval of the Mergers or the Agreement in
connection with a Superior Acquisition Proposal; and (g) Beacon can terminate
the Agreement in the event the average of the closing prices of EOP Common
Shares for the twenty consecutive trading days preceding the seventh trading day
prior to the Beacon Special Meeting is below $27.39. The Beacon Board also
considered as favorable to its determination the opinion, analyses and
presentations of Morgan Stanley & Co. Incorporated ("Morgan Stanley"), including
the opinion of Morgan Stanley dated September 15, 1997, to the effect that, as
of the date of such opinion and based upon and subject to certain matters stated
therein, the consideration to be received by the Beacon Shareholders pursuant to
the Agreement is fair from a financial point of view to the Beacon Shareholders.
 
     The Beacon Board also considered the following potentially negative factors
in its deliberations concerning the Mergers: (i) the limited public trading
history and limited public float of EOP; (ii) the reduction in distributions per
unit for Beacon Unitholders after the Partnership Merger from the current
quarterly distribution of $.50 per unit to $.42 per unit; (iii) the fact that
the Exchange Ratio is fixed and not subject to adjustment and, thus, a decrease
in the trading price of EOP Common Shares prior to the Effective Time would
reduce the value of the consideration paid to Beacon Unitholders (as implied by
the value of the EOP Common Shares) in the Partnership Merger; (iv) the risk
that the anticipated benefits of the Partnership Merger to Beacon Unitholders
may not be realized as a result of possible changes in the real estate market in
general, the inability to achieve the anticipated reductions in expenses or
other potential difficulties in integrating the two companies and their
respective operations; and (v) the significant costs involved in connection with
consummating the Mergers, the substantial management time and effort required to
effectuate the Mergers and integrate the businesses of Beacon and EOP and the
related disruption to Beacon's operations. The Beacon Board also considered the
potential benefits to certain directors and officers discussed in "-- Interests
of Certain Persons in the Mergers" below. Overall, however, the Beacon Board
concluded that the potentially negative factors considered by it were not
sufficient, either individually or collectively, to outweigh the positive
factors considered by the Beacon Board in its deliberations relating to the
Mergers.
 
OPINION OF BEACON FINANCIAL ADVISOR
 
     Beacon received the oral opinion of Morgan Stanley at the meeting of the
Beacon Board on September 14, 1997, which was confirmed in writing as of
September 15, 1997, to the effect that, as of the respective dates of such
opinions, the proposed consideration to be received by the Beacon Shareholders
pursuant to the Company Merger is fair from a financial point of view to the
Beacon Shareholders. Morgan Stanley's opinion did not specifically address the
fairness of the consideration to be received by Beacon Unitholders. The Beacon
Board believes, however, that the Morgan Stanley opinion is relevant to the
Beacon Unitholders because the value of the EOP Partnership Units to be received
by the Beacon Unitholders is derived from, and substantially equivalent to, the
value of the EOP Common Shares to be received by Beacon Shareholders in the
Company Merger.
 
     Morgan Stanley is an internationally recognized investment banking firm and
continually is engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, competitive
biddings, and secondary distributions of listed and unlisted securities, and
valuations for estate, corporate and other purposes. Beacon selected Morgan
Stanley as its financial advisor because of Morgan Stanley's reputation and
substantial experience in transactions such as the Company Merger and Morgan
Stanley's familiarity with Beacon and its business.
 
                                        4
<PAGE>   13
 
     Beacon has agreed to pay Morgan Stanley certain fees, to reimburse Morgan
Stanley for certain of its reasonable out-of-pocket expenses and to indemnify
Morgan Stanley against certain liabilities, including liabilities under the
federal securities laws. For additional information concerning Morgan Stanley
and its written opinion, see "THE MERGERS -- Opinion of Beacon Financial
Advisor" and Morgan Stanley's written opinion, dated September 15, 1997,
attached hereto as Annex II. The written opinion of Morgan Stanley should be
read in its entirety with respect to the assumptions made, matters considered
and limits of the reviews undertaken by Morgan Stanley in rendering such
opinion.
 
EFFECTIVE TIME OF THE MERGERS
 
     As soon as practicable after satisfaction or waiver of all conditions to
consummation of the Mergers (see "THE MERGERS -- Conditions to Consummation of
the Mergers"), EOP and Beacon will file articles of merger with the State
Department of Assessments and Taxation of Maryland (the "Department") and
immediately after consummation of the Company Merger, EOP Partnership will file
a certificate of merger with the Secretary of State of the State of Delaware.
The Mergers will become effective (the "Effective Time") at such time as will be
specified in the articles of merger and the certificate of merger, not to exceed
30 days after the articles of merger are accepted for record by the Department.
 
TRUSTEES, MANAGEMENT AND HEADQUARTERS AFTER THE MERGERS
 
     Following the Effective Time, the trustees of EOP who were trustees
immediately prior thereto will continue to serve for the balance of their
unexpired terms. In addition, Alan M. Leventhal, President, Chief Executive
Officer and a director of Beacon, and Edwin N. Sidman, Chairman of the Beacon
Board, will become trustees of EOP with terms expiring at the first annual
meeting of EOP Shareholders with respect to which notice is mailed subsequent to
the Effective Time. EOP has agreed that Messrs. Leventhal and Sidman will
thereafter be renominated as trustees for terms expiring at the annual meetings
of EOP Shareholders in 2002 and 2001, respectively. Those persons currently
serving as EOP's executive officers and senior management will continue to be
EOP's executive officers and senior management after the Effective Time, and the
location of EOP's principal executive offices will not change. EOP will continue
to be the managing general partner of EOP Partnership. See "THE
MERGERS -- Trustees and Management" and "-- Headquarters."
 
CONDITIONS TO CONSUMMATION OF THE MERGERS
 
     The consummation of the Mergers is subject to satisfaction or waiver of
certain conditions, including, among other things, obtaining the requisite
approval of the EOP Shareholders, the Beacon Shareholders, the Beacon Preferred
Shareholders and the Beacon Unitholders. See "THE MERGERS -- Conditions to
Consummation of the Mergers."
 
ANTICIPATED ACCOUNTING TREATMENT
 
     The Partnership Merger will be accounted for using the purchase method in
accordance with Accounting Principles Board Opinion No. 16. See "THE
MERGERS -- Anticipated Accounting Treatment."
 
CONDUCT OF BUSINESS PENDING THE MERGERS
 
     Each of Beacon and Beacon Partnership has agreed that, prior to the
Effective Time, it will, and will cause each of its respective Subsidiaries
which it controls to, conduct its business in the ordinary course, except in
certain circumstances. In addition, each of EOP and EOP Partnership has agreed
that, prior to the Effective Time, it will, and will cause each of its
respective Subsidiaries which it controls to, conduct its business consistent
with certain customary covenants. See "THE MERGERS -- Conduct of Business
Pending the Mergers."
 
                                        5
<PAGE>   14
 
SUMMARY RISK FACTORS
 
     In considering whether to approve the Partnership Merger, the Agreement and
the transactions contemplated thereby, the Beacon Unitholders entitled to vote
on the Partnership Merger should carefully consider, in addition to the other
information contained in this Proxy Statement/Prospectus, the matters discussed
under "RISK FACTORS." Such matters include:
 
     - The value of the EOP Partnership Units and the Beacon Partnership Units,
       as reflected in the relative market prices of the EOP Common Shares and
       the Beacon Common Shares at the Effective Time, may vary significantly
       from the value as reflected in such prices as of the date of execution of
       the Agreement, the date hereof or the date on which the Beacon
       Unitholders vote on the Partnership Merger and the Agreement due to
       changes in the business, operations and prospects of EOP or Beacon,
       market assessments of the likelihood that the Mergers will be consummated
       and the timing thereof, general market and economic conditions and other
       factors such as market perception of REIT shares and office REIT shares
       generally. See "RISK FACTORS -- Unit Value Fluctuations Through the
       Effective Time."
 
     - There can be no assurance as to the trading volume or market price of the
       EOP Common Shares after the Effective Time. Events outside the control of
       EOP which could adversely affect the market value of EOP's assets, as
       well as the market price of the EOP Common Shares and the value of the
       EOP Partnership Units, may occur after the Effective Time. See "RISK
       FACTORS -- Unit Value Fluctuations After the Effective Time."
 
     - After the Mergers, EOP will own or have an interest in (i) 245 office
       properties containing approximately 62.0 million rentable square feet of
       office space, representing an approximate 92% increase in the office
       space in EOP's portfolio (on a square foot basis) since EOP's IPO in July
       1997, and (ii) 17 stand-alone parking facilities containing approximately
       16,749 parking spaces, representing an approximate 13% increase in the
       parking spaces in EOP's portfolio since EOP's IPO. The failure to
       effectively manage rapid growth, including the growth resulting from the
       Mergers, could have a material adverse effect on operating results and
       financial condition of EOP. See "RISK FACTORS -- Failure to Effectively
       Manage Rapid Growth; Expansion into New Markets."
 
     - The federal income tax consequences of the Partnership Merger are highly
       complex and, with respect to each Beacon Unitholder, are dependent upon
       many variables, including the particular circumstances of such Beacon
       Unitholder. See "RISK FACTORS -- Federal Income Tax Risks -- Tax
       Consequences of the Partnership Merger" and "FEDERAL INCOME TAX
       CONSIDERATIONS -- Tax Consequences of the Partnership Merger" and
       "-- Effect of Subsequent Events."
 
     - Assuming EOP Partnership continues to make regular quarterly
       distributions at its current quarterly rate of $.30 per unit after the
       Partnership Merger, each Beacon Unitholder will receive an equivalent
       quarterly distribution payment of $.42 per unit, as compared to Beacon
       Partnership's most recent quarterly distribution of $.50 per unit. Based
       on the Exchange Ratio, the Beacon Unitholders will receive an adjusted
       annualized distribution of $1.69 per unit, representing a 16% decline
       from the Beacon Unitholders' current annual distribution of $2.00 per
       unit. See "RISK FACTORS -- Reductions in Distributions Per Unit for
       Beacon Unitholders After the Mergers."
 
     - Conflicts of interest exist due to the fact that certain members of the
       Beacon Board and the management of Beacon have certain interests in, and
       will receive benefits from, the Mergers that are different from, or in
       addition to, the interests of, and the benefits to, Beacon Unitholders
       generally. Upon, and at various times following, the closing of the
       transactions under the Agreement, certain executives and employees of
       Beacon and its affiliates will be entitled to receive severance payments
       (aggregating approximately $9.7 million), performance bonuses
       (aggregating approximately $31.2 million) and payments for taxes
       (currently estimated to aggregate approximately $18.8 million) pursuant
       to various existing Beacon incentive compensation, severance and other
       plans, arrangements or transactions, as well as the full vesting and
       immediate exercisability of all outstanding options to acquire Beacon
       Common Shares with an aggregate value (net of exercise price and assuming
       a price of
 
                                        6
<PAGE>   15
 
       $41 11/16 per Beacon Common Share) of approximately $34.7 million. In
       addition, certain officers and directors of Beacon and members of their
       families will benefit from certain agreements which are intended to
       permit such persons to continue to defer federal taxable income that
       otherwise might have to be recognized upon the sale of, or refinancing of
       indebtedness with respect to, certain Beacon Properties. See "RISK
       FACTORS -- Conflicts of Interest Arising from Benefits to Certain
       Directors and Officers of Beacon."
 
     - All decisions regarding the business and operations of EOP Partnership
       following the Mergers, including the amounts of distributions to be paid
       to the EOP Unitholders, will be made by EOP, which will continue to serve
       as managing general partner of EOP Partnership. Under the EOP Partnership
       Agreement, the limited partners of EOP Partnership may not remove EOP as
       the managing general partner. See "RISK FACTORS -- Limited Control over
       Business of EOP Partnership."
 
     - The Agreement provides for the payment by Beacon of a Break-Up Fee of up
       to $75 million if the Agreement is terminated by EOP or Beacon under
       certain circumstances, and/or reimbursement of expenses by EOP or Beacon
       of up to $10 million if the Agreement is terminated by EOP or Beacon
       under certain other circumstances. See "RISK FACTORS -- Payments if the
       Agreement Is Terminated."
 
     - The Merger Consideration (based upon the closing price of the EOP Common
       Shares on September 12, 1997) to be paid by EOP and EOP Partnership to
       Beacon Shareholders and Beacon Unitholders represents a 28.4% premium
       over the closing price of the Beacon Common Shares on September 12, 1997
       (the last trading day prior to the public announcement of the Mergers).
       Nevertheless, the Mergers have an accretive (rather than a dilutive)
       effect on EOP's Funds from Operations per unit on a pro forma basis for
       1996 and for the nine months ended September 30, 1997, and are expected
       to have an accretive effect for future periods. However, no assurance can
       be given that the Mergers will not have a dilutive effect on EOP's future
       Funds from Operations per unit. See "RISK FACTORS -- Possibility That the
       Expected Benefits of Mergers Will Not Be Realized."
 
     - The Beacon Unitholders do not have appraisal rights in connection with
       the Partnership Merger under Delaware law. See "RISK FACTORS -- No
       Appraisal Rights in Connection with the Partnership Merger."
 
     - EOP Partnership's investments are and will be subject to varying degrees
       of risk normally associated with the ownership of real property,
       including the need to renew leases or re-lease space upon lease
       expirations and to pay renovation and re-leasing costs in connection
       therewith, the effect of economic and other conditions on property cash
       flows and values, the ability of tenants to make lease payments, the
       ability of a property to generate revenue sufficient to meet operating
       expenses (including future debt service), the illiquidity of real estate
       investments and the risk of material losses in excess of insurance
       proceeds. Each of these risks could have a material adverse impact on EOP
       Partnership's business and future operations. See "RISK FACTORS -- Real
       Estate Risks."
 
     - EOP Partnership's investments are and will be subject to varying degrees
       of risk normally associated with debt financing, including the risk that
       EOP Partnership's cash flow will be insufficient to pay distributions at
       expected levels and meet required payments of principal and interest, the
       risk that existing indebtedness on its properties (which in virtually all
       cases will not have been fully amortized at maturity) will not be able to
       be refinanced or that the terms of such refinancing will not be as
       favorable as the terms of existing indebtedness, and the risk of
       increases in interest rates on variable rate indebtedness. In addition,
       the inability to refinance outstanding mortgage indebtedness upon
       maturity or refinance such indebtedness on favorable terms could result
       in foreclosures on properties pledged as collateral for such
       indebtedness. See "RISK FACTORS -- Debt Financing."
 
     - Upon consummation of the Mergers approximately 17.6% of the EOP Office
       Properties (in number of buildings) and 15.6% (in square footage) will be
       located in California, and 14.3% (in number of buildings) and 12.1% (in
       square footage) will be located in metropolitan Boston. See "RISK
       FACTORS -- Concentration of Properties in Certain Markets."
 
                                        7
<PAGE>   16
 
     - EOP would be taxed as a corporation were it to fail to qualify as a REIT
       for federal income tax purposes, resulting in liability for certain
       federal, state and local income taxes, which could have a material
       adverse impact on the value of the EOP Common Shares and EOP Partnership
       Units and on EOP Partnership's business and future operations. See "RISK
       FACTORS -- Federal Income Tax Risks."
 
     - EOP's ability to limit, for purposes of maintaining its REIT status, the
       actual or constructive ownership of EOP Common Shares to 9.9% of the
       outstanding EOP Common Shares, and of certain other provisions contained
       in the organizational documents of EOP and EOP Partnership, could have
       the effect of delaying, deferring or preventing a transaction or change
       in control of EOP that might involve a premium price for the EOP Common
       Shares or otherwise would be in the best interests of the EOP
       Securityholders. See "RISK FACTORS -- Limitations on Changes in Control
       and of Ownership Limit."
 
INTERESTS OF CERTAIN PERSONS IN THE MERGERS
 
     Certain directors, executives and employees of Beacon and its affiliates
and certain holders of Beacon Common Shares and/or Beacon Partnership Units have
certain interests in the Mergers that are different from, or in addition to, the
interests generally of the Beacon Unitholders. These interests include interests
in Beacon stock options, severance, incentive compensation and other benefit
plans, certain agreements restricting the sale or refinancing of certain Beacon
Properties intended to permit the beneficiaries to defer certain taxes, the
Stock Purchase Agreements, and indemnification. See "THE MERGERS -- Interests of
Certain Persons in the Mergers." The Beacon Board and the EOP Board were aware
of these interests and considered them, among other matters, in approving the
Mergers, the Agreement and the transactions contemplated thereby.
 
FEDERAL INCOME TAX CONSEQUENCES OF THE PARTNERSHIP MERGER
 
     The Partnership Merger and the resulting issuance and distribution of EOP
Partnership Units to Beacon Unitholders should not result in the recognition of
taxable gain, at the time of the Partnership Merger, to a Beacon Unitholder who
does not receive in connection with the Partnership Merger a cash distribution
(or a deemed cash distribution resulting from relief from liabilities) that
exceeds such Beacon Unitholder's aggregate adjusted basis in its Beacon
Partnership Units at the time of the Partnership Merger. Whether a particular
Beacon Unitholder will receive a deemed cash distribution attributable to relief
from liabilities in connection with the Partnership Merger that exceeds its
adjusted basis in its Beacon Partnership Units at the time of the Partnership
Merger will depend upon a number of variables, which are explained in detail
below under the heading "FEDERAL INCOME TAX CONSIDERATIONS -- Tax Consequences
of the Partnership Merger." In addition, as a result of events and transactions
that might occur subsequent to the Partnership Merger, a Beacon Unitholder could
be required to recognize all or part of the gain deferred at the time of the
Partnership Merger. See "FEDERAL INCOME TAX CONSEQUENCES -- Effect of Subsequent
Events."
 
FEDERAL INCOME TAX CLASSIFICATION OF EOP PARTNERSHIP AND EOP
 
     Hogan & Hartson L.L.P., counsel to EOP, will provide to EOP and EOP
Partnership an opinion to the effect that EOP Partnership will be treated as a
partnership for federal income tax purposes and will not be subject to tax as a
corporation or an association taxable as a corporation.
 
     Hogan & Hartson L.L.P. also will provide to EOP and Beacon an opinion to
the effect that, commencing with its formation on July 11, 1997, it has been
organized and has operated in such a manner so as to qualify for taxation as a
REIT under the Code and that after giving effect to the Mergers, EOP's proposed
method of operation will enable it to continue to meet the requirements for
qualification and taxation as a REIT. Goodwin, Procter & Hoar LLP, counsel to
Beacon, will deliver an opinion to EOP, as a condition to the Mergers, to the
effect that for Beacon's taxable year ended December 31, 1994, and for all
subsequent taxable
 
                                        8
<PAGE>   17
 
years ending on or before the Effective Time, Beacon was organized and has
operated in conformity with the requirements for qualification as a REIT under
the Code.
 
RESALES OF EOP PARTNERSHIP UNITS, EOP COMMON SHARES AND EOP PREFERRED SHARES
 
     The EOP Partnership Units to be issued to the holders of Beacon Partnership
Units in the Partnership Merger will be transferable subject to the restrictions
contained in the EOP Partnership Agreement as described under "EOP PARTNERSHIP
AGREEMENT AND UNITS OF PARTNERSHIP INTEREST -- Transfer or Pledge of Partnership
Interests." The EOP Common Shares and the EOP Preferred Shares to be issued to
holders of the Beacon Common Shares and the Beacon Preferred Shares,
respectively, upon consummation of the Company Merger, and the EOP Common Shares
reserved for issuance upon redemption of EOP Partnership Units to be issued to
holders of Beacon Partnership Units upon consummation of the Partnership Merger,
are registered under the Securities Act, and will be transferable freely and
without restriction by those holders of Beacon Common Shares, Beacon Preferred
Shares and Beacon Partnership Units who receive such shares following the
consummation of the Mergers and who are not deemed to be "Affiliates" (as
defined under Rule 145 of the Securities Act generally to include trustees,
directors, certain executive officers and ten percent or more shareholders) of
EOP or Beacon. Beacon has agreed to use its reasonable best efforts to cause
each person who may be deemed an "Affiliate" of Beacon at the time of the
Shareholder Meetings to deliver to EOP a written agreement that such person will
not dispose of EOP Common Shares received by such person in the Mergers except
in compliance with the Securities Act. See "THE MERGERS -- Resales of EOP
Partnership Units, EOP Common Shares and EOP Preferred Shares."
 
TERMINATION
 
     The Agreement may be terminated under certain circumstances at any time
prior to the Effective Time, whether before or after the approval of the
Partnership Merger by the Beacon Unitholders. See "THE MERGERS -- Termination,
Extension, Amendment and Waiver."
 
BREAK-UP FEES
 
     The Agreement provides for the payment by Beacon of a Break-Up Fee of up to
$75 million if the Agreement is terminated by EOP or Beacon under certain
circumstances. In addition, the Agreement provides for reimbursement to EOP or
Beacon of expenses of up to $10 million if the Mergers are terminated by EOP or
Beacon under other circumstances. See "THE MERGERS -- Fees and Expenses."
 
ACQUISITION OF BEACON SERVICE COMPANIES
 
     Beacon manages approximately 2.2 million square feet of commercial and
office space owned by third parties through Beacon Property Management
Corporation, a Massachusetts corporation ("Beacon Management Company"), and
conducts third-party tenant design services through Beacon Design Corporation, a
Massachusetts corporation ("Beacon Design Company"). The holders (which are
certain trusts affiliated with Messrs. Alan Leventhal and Sidman) of 99% of the
voting stock in each of Beacon Management Company, Beacon Design Company and
Beacon Construction Company, Inc., a Massachusetts corporation ("Beacon
Construction Company" and, together with Beacon Management Company and Beacon
Design Company, the "Beacon Service Companies"), have agreed to sell such stock
to Equity Office Properties Management Corp., a Delaware corporation in which
EOP owns a 95% non-voting equity interest ("EOP Management Corp."), or its
designees, upon the consummation of the Mergers pursuant to certain stock
purchase agreements (the "Stock Purchase Agreements"). The remaining interests
in the Beacon Service Companies are held by Beacon Partnership. Upon the
consummation of the Partnership Merger and the transactions contemplated by the
Stock Purchase Agreements, EOP Management Corp. will succeed to Beacon's
third-party management and design businesses. EOP Management Corp. expects to
cease operating Beacon Construction Company's construction business upon the
completion of Beacon Construction Company's existing contracts.
 
                                        9
<PAGE>   18
 
EQUIVALENT PER UNIT DATA
 
     The following summary presents selected comparative unaudited per unit
information for Beacon Partnership on a historical basis and EOP Partnership and
Beacon Partnership on a pro forma combined basis assuming the Mergers had been
effective throughout the periods presented. Such per unit amounts allow
comparison of historical information with respect to the value of one Beacon
Partnership Unit to the corresponding information with respect to the projected
value of one Beacon Partnership Unit as a result of the Partnership Merger and
are computed by multiplying the pro forma amounts by the Exchange Ratio.
 
     EOP Partnership income statement information for the year ended December
31, 1996 and balance sheet information as of December 31, 1996 are based on, and
should be read in conjunction with, the consolidated audited financial
statements of EOP Partnership included in this Proxy Statement/Prospectus.
Beacon Partnership income statement information for the year ended December 31,
1996 and balance sheet information as of December 31, 1996 are based on, and
should be read in conjunction with, the Consolidated Financial Statements of
Beacon Partnership included in this Proxy Statement/Prospectus. The remaining
financial information is based on the respective historical consolidated
unaudited financial statements of EOP Partnership and Beacon Partnership and the
notes thereto. In the opinion of the respective managements of EOP and Beacon,
all adjustments necessary to present a fair statement of results of interim
periods of EOP Partnership and Beacon Partnership (which adjustments were of a
normal recurring nature) have been included. Results for EOP Partnership and
Beacon Partnership for the nine months ended September 30, 1997 are not
necessarily indicative of results to be expected for their entire fiscal years,
nor are pro forma amounts necessarily indicative of results that will be
obtained on a combined basis.
 
<TABLE>
<CAPTION>
                                                              NINE MONTHS ENDED    YEAR ENDED
                                                                SEPTEMBER 30,     DECEMBER 31,
                                                                    1997              1996
                                                              -----------------   ------------
<S>                                                           <C>                 <C>
NET INCOME PER UNIT(A)
  EOP Partnership...........................................          N/A               N/A
  Beacon Partnership........................................       $ 1.38            $ 1.21
  EOP Partnership and Beacon Partnership pro forma
     combined...............................................       $  .80            $ 1.02
  Beacon Partnership pro forma equivalent(B)................       $ 1.13            $ 1.43
CASH DISTRIBUTIONS DECLARED PER UNIT
  EOP Partnership...........................................          N/A               N/A
  Beacon Partnership........................................       $1.425            $1.765
  EOP Partnership and Beacon Partnership pro forma
     combined...............................................       $  .90            $ 1.20
  Beacon Partnership pro forma equivalent(B)................       $1.266            $ 1.69
UNITHOLDERS' EQUITY (BOOK VALUE) PER UNIT (end of period)
  EOP Partnership...........................................       $20.78                --
  Beacon Partnership........................................       $21.59                --
  EOP Partnership and Beacon Partnership pro forma
     combined...............................................       $24.64                --
  Beacon Partnership pro forma equivalent (B)...............       $34.65                --
</TABLE>
 
- ---------------
(A) The Mergers are not dilutive and, therefore, fully-diluted net income per
    EOP Partnership Unit is not presented herein.
 
(B) The Beacon pro forma equivalent is determined by multiplying the Exchange
    Ratio (1.4063) by the EOP and Beacon pro forma combined per common unit
    amounts so that the per common unit amounts are equated to the comparative
    values for each Beacon Partnership Unit.
 
                                       10
<PAGE>   19
 
     The following table presents the weighted average number of units
outstanding relevant to the calculation of net income per unit as shown in the
preceding table.
 
<TABLE>
<CAPTION>
                                                          NINE MONTHS ENDED    YEAR ENDED
                                                            SEPTEMBER 30,     DECEMBER 31,
                                                                1997              1996
                                                          -----------------   ------------
<S>                                                       <C>                 <C>
EOP Partnership.........................................             N/A              N/A
Beacon Partnership......................................      59,443,531       34,446,907
EOP Partnership and Beacon Partnership pro forma
  combined..............................................     273,120,214      273,120,214
</TABLE>
 
MARKET PRICES OF COMMON SHARES
 
     The EOP Partnership Units and the Beacon Partnership Units are not listed
on any national securities exchange or quoted in the over the counter market,
and there is no established public trading market for either of the EOP
Partnership Units or the Beacon Partnership Units. However, each EOP Partnership
Unit to be received by Beacon Unitholders in the Partnership Merger may be
redeemed for one EOP Common Share or, at EOP's option, the cash equivalent
thereof. The Beacon Partnership Units currently may be redeemed for Beacon
Common Shares or, at the option of Beacon, the cash equivalent thereof. The
following table sets forth the price per share of EOP Common Shares and Beacon
Common Shares based on the last reported sale prices per share on the NYSE on
September 12, 1997, the last trading day prior to public announcement of the
execution of the Agreement, and on November 12, 1997, the most recent date for
which prices are available prior to mailing this Proxy Statement/Prospectus.
 
<TABLE>
<CAPTION>
                                                              PRICE PER SHARE
                                                   -------------------------------------
                                                     HISTORICAL
                                                   ---------------       BEACON PRO FORMA
                                                   EOP       BEACON      EQUIVALENT(a)
                                                   ---       ------       ----------------
<S>                                                <C>       <C>             <C>
September 12, 1997(b)............................  $33 7/16   $36   5/8      $47.02
November 12, 1997................................  $30 7/16   $41 11/16      $42.80
</TABLE>
 
- ---------------
(a) Computed by multiplying the last sale price of EOP Common Shares by the
    Exchange Ratio.
 
(b) The average last reported sale price per EOP Common Share for the five
    trading days preceding September 12, 1997 was $32.225. The Beacon pro forma
    equivalent, based on such five trading days, would be $45.32.
 
DISTRIBUTION POLICY
 
     Holders of EOP Partnership Units are entitled to cash distributions when,
if and as declared by the EOP Board as managing general partner of EOP
Partnership. There can be no assurance as to the payment of distributions on EOP
Partnership Units in the future because such payment will depend upon the
earnings and financial condition of EOP Partnership, as well as other related
factors. The EOP Partnership Agreement permits the issuance of preferred
partnership interests having the right to receive distributions before
distributions on the EOP Partnership Units are declared or paid. The EOP
Preferred Units will have such preferential distribution rights as described
below. In order to remain qualified as a REIT under the Code, EOP must
distribute to EOP Shareholders at least 95% of its REIT taxable income (other
than net capital gain) annually. See "FEDERAL INCOME TAX
CONSIDERATIONS -- Requirements for Qualification as a REIT -- Annual
Distribution Requirements Applicable to REITs." The Maryland REIT Law provides
that EOP may not pay distributions if, after giving effect to the distribution,
EOP would be insolvent or if the distribution exceeds the surplus of EOP.
 
                                       11
<PAGE>   20
 
                          SUMMARY UNAUDITED PRO FORMA
                            COMBINED FINANCIAL DATA
 
     The following table sets forth the summary unaudited pro forma combined
financial data for EOP Partnership and Beacon Partnership as a combined entity,
giving effect to the Partnership Merger as if it had occurred on the dates
indicated herein, after giving effect to the pro forma adjustments and
additional adjustments related to certain other EOP Partnership and Beacon
Partnership transactions which have either occurred or are probable of occurring
subsequent to September 30, 1997 as described in the notes to the pre-Merger
unaudited pro forma combined financial statements appearing for EOP Partnership
elsewhere in this Proxy Statement/Prospectus.
     The unaudited pro forma combined operating and other data are presented as
if the Partnership Merger had been consummated at the beginning of each period
presented. The unaudited pro forma combined balance sheet data at September 30,
1997 is presented as if the Partnership Merger and certain other EOP Partnership
and Beacon Partnership transactions had occurred on September 30, 1997. In the
opinion of management, all adjustments necessary to reflect the effects of these
transactions have been made. The Partnership Merger has been accounted for under
the purchase method of accounting in accordance with the Accounting Principles
Board Opinion No. 16.
     The pro forma financial information should be read in conjunction with, and
is qualified in its entirety by, the respective historical audited financial
statements and notes thereto of EOP Partnership and Beacon Partnership set forth
in this Proxy Statement/Prospectus and the unaudited pro forma financial
statements and notes thereto of EOP Partnership appearing elsewhere in this
Proxy Statement/Prospectus and of Beacon Partnership incorporated herein by
reference.
     The unaudited pro forma operating data and other data are presented for
comparative purposes only and are not necessarily indicative of what the actual
combined results of operations of EOP Partnership and Beacon Partnership would
have been for the periods presented, nor does such data purport to represent the
results of future periods.
 
<TABLE>
<CAPTION>
                                                              PRO FORMA FOR THE   PRO FORMA FOR THE
                                                              NINE MONTHS ENDED      YEAR ENDED
                                                                SEPTEMBER 30,       DECEMBER 31,
                                                                    1997                1996
                                                              -----------------   -----------------
                                                                      (AMOUNTS IN THOUSANDS
                                                                      EXCEPT PER UNIT DATA)
<S>                                                           <C>                 <C>
OPERATING DATA:
Revenues:
 Rental.....................................................     $   784,519         $  967,335
 Tenant reimbursements......................................         143,910            167,321
 Parking....................................................          43,430             54,314
 Other......................................................          21,280             42,578
 Management fees............................................           6,286              8,125
 Interest...................................................          19,930             21,143
                                                                 -----------         ----------
     Total revenue..........................................       1,019,355          1,260,816
                                                                 -----------         ----------
Expenses:
 Property operating.........................................         362,313            462,287
 Interest...................................................         193,032            251,621
 Depreciation and amortization..............................         185,341            242,899
 General and administrative.................................          39,573             32,644
                                                                 -----------         ----------
     Total expenses.........................................         780,259            989,451
                                                                 -----------         ----------
Income before allocation to minority interests, income from
 investment in unconsolidated joint ventures, gain on sale
 of real estate and extraordinary items.....................         239,096            271,365
Discontinued operations:
 Loss of operations -- Construction Company.................          (2,263)            (2,609)
 Loss on sale -- Construction Company.......................              --               (249)
Minority interests in partially owned properties............          (1,233)            (2,142)
Income from investment in unconsolidated joint ventures.....           9,033              9,264
Gain on sale of real estate.................................              --             21,843
Preferred dividends.........................................         (13,470)           (17,960)
                                                                 -----------         ----------
Income before extraordinary items...........................         231,163            279,512
Extraordinary items.........................................         (12,929)                --
                                                                 -----------         ----------
Net income..................................................     $   218,234         $  279,512
                                                                 ===========         ==========
Weighted average units outstanding..........................         273,120            273,120
                                                                 ===========         ==========
Net income per unit.........................................     $       .80         $     1.02
                                                                 ===========         ==========
BALANCE SHEET DATA: (AT END OF PERIOD)
Real estate, after accumulated depreciation.................     $10,299,868
                                                                 ===========
Total assets................................................     $10,720,165
                                                                 ===========
Total debt..................................................     $ 3,525,303
                                                                 ===========
Total liabilities...........................................     $ 3,763,058
                                                                 ===========
Partners' capital...........................................     $ 6,957,107
                                                                 ===========
</TABLE>
 
                                       12
<PAGE>   21
 
                                EOP PARTNERSHIP
 
           SUMMARY SELECTED CONSOLIDATED AND COMBINED FINANCIAL DATA
 
     The following sets forth summary selected consolidated and combined
financial and operating information on an historical basis for EOP Partnership
and the EOP Predecessors. The following information should be read in
conjunction with the consolidated and combined financial statements and notes
thereto of EOP Partnership and the EOP Predecessors included elsewhere in this
Proxy Statement/Prospectus. The summary selected consolidated historical
financial and operating information of EOP Partnership at September 30, 1997 and
for the period from July 11, 1997 to September 30, 1997, has been derived from
the historical financial and operating information of EOP Partnership. The
summary selected combined historical and operating information of EOP
Predecessors for the period from January 1, 1997 to July 10, 1997 and the nine
months ended September 30, 1996, has been derived from the historical unaudited
combined financial statements of the EOP Predecessors. The summary selected
combined historical financial and operating information of the EOP Predecessors
at December 31, 1996 and 1995, and for each of the three years in the period
ended December 31, 1996, has been derived from the historical combined financial
statements of the EOP Predecessors audited by Ernst & Young LLP, independent
auditors, whose report with respect thereto is included elsewhere in this Proxy
Statement/Prospectus. The summary selected combined historical financial and
operating information of the EOP Predecessors at December 31, 1994, 1993 and
1992, and for each of the two years in the period ended December 31, 1993, has
been derived from the historical unaudited combined financial statements of the
EOP Predecessors.
<TABLE>
<CAPTION>
                                              EOP
                                          PARTNERSHIP          EOP
                                         FOR THE PERIOD    PREDECESSORS    EOP PREDECESSORS
                                              FROM        FOR THE PERIOD     NINE MONTHS
                                         JULY 11, 1997         FROM             ENDED
                                               TO           JANUARY 1,      SEPTEMBER 30,
                                         SEPTEMBER 30,       1997 TO       ----------------
                                              1997        JULY 10, 1997          1996
                                         --------------   --------------         ----
<S>                                      <C>              <C>              <C>
OPERATING DATA:
Revenue:
 Rental, parking and other.............    $  162,290       $ 327,017         $  343,660
                                           ==========       =========           ========
   Total Revenue.......................    $  164,568         339,104            353,237
                                           ==========       =========           ========
Expenses:
 Interest..............................        25,793          80,481             87,551
 Depreciation and amortization.........        24,161          66,034             69,193
 Property operating expenses(1)........        62,885         127,285            141,823
 General and administrative............         5,855          17,201             16,278
 Provision for value impairment........             0               0                  0
                                           ----------       ---------           --------
   Total Expenses......................    $  118,694       $ 291,001         $  314,845
                                           ==========       =========           ========
Income before (income) loss allocated
 to minority interests, income from
 investments in unconsolidated joint
 ventures, gain on sale of real estate,
 and extraordinary items...............    $   45,874       $  48,103         $   38,392
Minority interests allocation..........          (279)           (912)            (2,166)
Income from investments in
 unconsolidated joint ventures.........         1,426           1,982              1,554
Gain on sale of real estate and
 extraordinary items...................       (12,930)         12,236              5,262
                                           ----------       ---------           --------
   Net income..........................    $   34,091       $  61,409         $   43,042
                                           ==========       =========           ========
   Net income per unit.................    $      .21
                                           ==========
BALANCE SHEET DATA (AT END OF PERIOD):
Investment in real estate after
 accumulated depreciation..............    $5,000,159              --                 --
   Total assets........................     5,355,922              --                 --
Mortgage debt, notes payable and
 revolving line of credit..............     1,716,458              --                 --
   Total liabilities...................     1,892,170              --                 --
Minority interests.....................        28,118              --                 --
Partners' Capital/Owners' Equity.......     3,435,634              --                 --
OTHER DATA:
General and administrative expenses as
 a percentage of total revenues........           3.6%             --                4.6%
Number of Office Properties owned at
 period end(2)(3)......................            93              --                 78
Net rental square feet of Office
 Properties owned at period end (in
 millions)(2)..........................          33.4              --               27.8
Occupancy of Office Properties owned at
 period end(2).........................           93%              --                 89%
Number of Parking Facilities owned at
 period end............................            16              --                  3
Number of spaces at Parking Facilities
 owned at period end...................        16,037              --              7,321
Funds from Operations(4)...............    $   70,148       $ 113,022         $  103,798
Cash flow from operating activities....    $   59,665       $  95,960         $   89,685
Cash flow from investing activities....    $  (85,634)      $(571,068)        $ (589,340)
Cash flow from financing activities....    $  158,593       $ 245,851         $  530,280
Ratio of earnings to fixed charges.....          2.57            1.52               1.41
 
<CAPTION>
 
                                              EOP PREDECESSORS (COMBINED HISTORICAL) YEARS ENDED
                                                                 DECEMBER 31,
                                         ------------------------------------------------------------
                                            1996         1995         1994         1993        1992
                                            ----         ----         ----         ----        ----
<S>                                      <C>          <C>          <C>          <C>          <C>
OPERATING DATA:
Revenue:
 Rental, parking and other.............  $  493,396   $  356,959   $  230,428   $  150,315   $ 96,787
                                         ==========   ==========   ==========   ==========   ========
   Total Revenue.......................  $  508,124   $  371,457   $  240,878   $  159,246   $107,154
                                         ==========   ==========   ==========   ==========   ========
Expenses:
 Interest..............................  $  119,595   $  100,566   $   59,316   $   36,755   $ 25,775
 Depreciation and amortization.........      96,237       74,156       46,905       29,752     19,266
 Property operating expenses(1)........     201,067      151,488      107,412       74,028     48,856
 General and administrative............      23,145       21,987       15,603       12,012      8,720
 Provision for value impairment........           0       20,248            0            0          0
                                         ----------   ----------   ----------   ----------   --------
   Total Expenses......................  $  440,044   $  368,445   $  229,236   $  152,547   $102,617
                                         ==========   ==========   ==========   ==========   ========
Income before (income) loss allocated
 to minority interests, income from
 investments in unconsolidated joint
 ventures, gain on sale of real estate,
 and extraordinary items...............  $   68,080   $    3,012   $   11,642   $    6,699   $  4,537
Minority interests allocation..........      (2,086)      (2,129)       1,437        1,772      1,793
Income from investments in
 unconsolidated joint ventures.........       2,093        2,305        1,778            0          0
Gain on sale of real estate and
 extraordinary items...................       5,338       31,271        1,705           --         --
                                         ----------   ----------   ----------   ----------   --------
   Net income..........................  $   73,425   $   34,459   $   16,562   $    8,471   $  6,330
                                         ==========   ==========   ==========   ==========   ========
   Net income per unit.................
 
BALANCE SHEET DATA (AT END OF PERIOD):
Investment in real estate after
 accumulated depreciation..............  $3,291,815   $2,393,403   $1,815,160   $1,220,268   $820,805
   Total assets........................   3,912,565    2,650,890    2,090,933    1,318,644    912,631
Mortgage debt, notes payable and
 revolving line of credit..............   1,964,892    1,434,827    1,261,156      798,897    526,830
   Total liabilities...................   2,174,483    1,529,334    1,350,552      845,315    552,666
Minority interests.....................      11,080       31,587        9,283      (15,298)   (14,133)
Partners' Capital/Owners' Equity.......   1,727,002    1,089,969      731,098      488,627    374,098
OTHER DATA:
General and administrative expenses as
 a percentage of total revenues........         4.6%         5.9%         6.5%         7.5%       8.1%
Number of Office Properties owned at
 period end(2)(3)......................          83           73           63           48         33
Net rental square feet of Office
 Properties owned at period end (in
 millions)(2)..........................        29.2         23.1         18.5         13.6        9.1
Occupancy of Office Properties owned at
 period end(2).........................          90%          86%          88%          80%        73%
Number of Parking Facilities owned at
 period end............................          10            3            0            0          0
Number of spaces at Parking Facilities
 owned at period end...................       7,321        3,323            0            0          0
Funds from Operations(4)...............  $  160,460       96,104   $   60,372           --         --
Cash flow from operating activities....  $  165,975   $   93,878   $   73,821           --         --
Cash flow from investing activities....  $ (924,227)  $ (380,615)  $ (513,965)          --         --
Cash flow from financing activities....  $1,057,551   $  276,513   $  514,923           --         --
Ratio of earnings to fixed charges.....        1.49         1.21         1.24         1.23       1.24
</TABLE>
 
                                                   (Footnotes on following page)
 
                                       13
<PAGE>   22
 
- -------------------------
(1) Includes EOP Property operating expenses, real estate taxes, insurance, as
    well as repair and maintenance expenses.
 
(2) The data at the periods ended September 30, 1997, December 31, 1996 and 1995
    includes 28 State Street, a 570,040 square foot EOP Office Property which
    recently has undergone major redevelopment and was vacant prior to May,
    1997. The weighted average occupancy, excluding 28 State Street, as of
    September 30, 1997, December 31, 1996 and 1995 was approximately 94%, 92%
    and 88%, respectively.
 
(3) The number of EOP Office Properties owned as of December 31, 1996, as
    reflected in the combined historical financial statements, includes Barton
    Oaks Plaza II, an EOP Office Property which was sold in January, 1997 and
    8383 Wilshire, an EOP Office Property which was sold in May, 1997.
 
(4) The White Paper on Funds from Operations approved by the Board of Governors
    of the National Association of Real Estate Investment Trusts ("NAREIT") in
    March 1995 defines Funds from Operations as net income (loss) (computed in
    accordance with GAAP), excluding gains (or losses) from debt restructuring
    and sales of properties, plus real estate related depreciation and
    amortization and after adjustments for unconsolidated partnerships and joint
    ventures. EOP Partnership believes that Funds from Operations is helpful to
    investors as a measure of the performance of an equity REIT because, along
    with cash flow from operating activities, financing activities and investing
    activities, it provides investors with an indication of the ability of EOP
    Partnership to incur and service debt, to make capital expenditures and to
    fund other cash needs. EOP Partnership computes Funds from Operations in
    accordance with standards established by NAREIT which may not be comparable
    to Funds from Operations reported by other REIT's that do not define the
    term in accordance with the current NAREIT definition or that interpret the
    current NAREIT definition differently than does EOP Partnership. Funds from
    Operations does not represent cash generated from operating activities in
    accordance with GAAP and should not be considered as an alternative to net
    income (determined in accordance with GAAP) as an indication of EOP
    Partnership's financial performance or to cash flow from operating
    activities (determined in accordance with GAAP) as a measure of EOP
    Partnership's liquidity, nor is it indicative of funds available to fund EOP
    Partnership's cash needs, including its ability to make distributions. For a
    reconciliation of net income and Funds from Operations, see "EOP PARTNERSHIP
    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
    OPERATIONS -- Funds from Operations."
 
                                       14
<PAGE>   23
 
          BEACON PARTNERSHIP SUMMARY SELECTED COMBINED FINANCIAL DATA
 
     The following table sets forth summary selected financial and operating
information for Beacon Partnership and on a combined historical basis for Beacon
Partnership and The Beacon Group (the "Beacon Predecessor"). The consolidated
results of operations for the nine months ended September 30, 1997 and 1996 have
been derived from unaudited financial statements. The consolidated results of
operations of Beacon Partnership for the years ended December 31, 1996 and 1995
and for the period from May 26, 1994 to December 31, 1994, the combined results
of operations of the Beacon Predecessor for the period from January 1, 1994 to
May 25, 1994 and the combined historical operating information of the Beacon
Predecessor for the years ended December 31, 1993 and 1992 have been derived
from the financial statements audited by Coopers & Lybrand L.L.P., independent
accountants, whose report with respect to the years 1992 through 1996 is
included elsewhere in this Proxy Statement/Prospectus.
<TABLE>
<CAPTION>
                                                                      BEACON PARTNERSHIP
                                          --------------------------------------------------------------------------
                                                                                                          FOR THE
                                                                                                           PERIOD
                                           NINE MONTHS     NINE MONTHS    FOR THE YEAR   FOR THE YEAR     MAY 26,
                                              ENDED           ENDED          ENDED          ENDED         1994 TO
                                          SEPTEMBER 30,   SEPTEMBER 30,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                              1997            1996            1996           1995           1994
                                          -------------   -------------   ------------   ------------   ------------
<S>                                       <C>             <C>             <C>            <C>            <C>
                                           (UNAUDITED)     (UNAUDITED)
                                                       (DOLLARS IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
OPERATING INFORMATION:
Revenues:
Rental Income...........................   $   218,544     $    97,308     $  147,825     $   69,781     $   23,702
Management fees.........................         2,445           2,248          3,005          2,203             --
Recoveries from tenants.................        29,376          11,001         16,719          9,524          4,395
Mortgage interest income................         5,320           3,561          4,970          2,546             --
Other income............................        10,350           7,567         11,249          5,985          2,671
                                           -----------     -----------     ----------     ----------     ----------
    Total Revenue.......................       266,035         121,691        183,768         90,039         30,768
                                           -----------     -----------     ----------     ----------     ----------
EXPENSES:
Property expenses.......................        51,169          24,607         37,210         17,698          6,497
Real estate taxes.......................        27,960          12,491         18,124          9,950          3,015
General and administrative..............        27,920          11,828         19,218          9,444          2,943
Mortgage interest expense...............        36,313          20,739         30,300         15,220          4,970
Interest -- amortization of financing
  costs.................................         1,131           1,618          2,084          1,370            617
Depreciation and amortization...........        50,756          21,726         33,170         17,233          6,727
                                           -----------     -----------     ----------     ----------     ----------
    Total Expenses......................       195,249          93,009        140,106         70,915         24,769
                                           -----------     -----------     ----------     ----------     ----------
Income (loss) from operations...........        70,786          28,682         43,662         19,124          5,999
Equity (loss) in joint ventures and
  corporations(1).......................         4,940           3,836          4,899          3,103            858
                                           -----------     -----------     ----------     ----------     ----------
Income (loss) from continuing operations
  before minority interest..............        75,726          32,518         48,561         22,227          6,857
Minority interest in partnerships and
  corporations..........................            --              --            (15)           (36)            (8)
                                           -----------     -----------     ----------     ----------     ----------
Income (loss) from continuing
  operations............................        75,726          32,518         48,546         22,191          6,849
Discontinued Beacon Construction
  Company...............................
  Income (loss) from operations.........        (2,263)         (1,911)        (2,609)           (12)           477
  Loss on sale..........................            --              --           (249)            --             --
                                           -----------     -----------     ----------     ----------     ----------
Gain on sale of property................        16,736              --             --             --             --
                                           -----------     -----------     ----------     ----------     ----------
Income (loss) before extraordinary
  items.................................        90,199          30,607         45,688         22,179          7,326
Extraordinary items.....................        (2,635)         (3,876)        (3,876)            --             --
                                           -----------     -----------     ----------     ----------     ----------
Net income (loss).......................   $    87,564     $    26,731     $   41,812     $   22,179     $    7,326
                                           ===========     ===========     ==========     ==========     ==========
PER UNIT DATA:
Income before extraordinary items.......   $      1.42     $      0.99     $     1.32     $     1.09     $     0.48
Extraordinary items.....................         (0.04)          (0.13)         (0.11)            --             --
                                           -----------     -----------     ----------     ----------     ----------
Net income..............................   $      1.38     $      0.86     $     1.21     $     1.09     $     0.48
                                           ===========     ===========     ==========     ==========     ==========
Distributions declared..................   $     1.425     $    1.3025     $    1.765     $     1.24     $     0.96
                                           -----------     -----------     ----------     ----------     ----------
Distributions paid......................   $     1.425     $    1.3025     $    1.765     $     1.64     $     0.56
Weighted average units outstanding......    59,443,531      30,955,399     34,446,907     20,323,327     15,270,899
 
<CAPTION>
                                                 BEACON PREDECESSOR
                                          ---------------------------------
                                             FOR THE
                                             PERIOD
                                           JANUARY 1,        YEAR ENDED
                                             1994 TO        DECEMBER 31,
                                             MAY 25,      -----------------
                                              1994         1993      1992
                                          -------------   -------   -------
<S>                                       <C>             <C>       <C>
 
OPERATING INFORMATION:
Revenues:
Rental Income...........................     $5,776       $14,315   $11,406
Management fees.........................      1,521         3,533     3,331
Recoveries from tenants.................      1,040         2,349     1,989
Mortgage interest income................         --            --        --
Other income............................        675         2,176     2,003
                                             ------       -------   -------
    Total Revenue.......................      9,012        22,373    18,729
                                             ------       -------   -------
EXPENSES:
Property expenses.......................      2,086         4,580     4,522
Real estate taxes.......................        595         1,354     1,204
General and administrative..............      1,399         4,357     4,658
Mortgage interest expense...............      2,798         7,650     7,203
Interest -- amortization of financing
  costs.................................        373           192       138
Depreciation and amortization...........      2,385         5,577     5,505
                                             ------       -------   -------
    Total Expenses......................      9,636        23,710    23,230
                                             ------       -------   -------
Income (loss) from operations...........       (624)       (1,337)   (4,501)
Equity (loss) in joint ventures and
  corporations(1).......................        198        (5,953)   (1,544)
                                             ------       -------   -------
Income (loss) from continuing operations
  before minority interest..............       (426)       (7,290)   (6,045)
Minority interest in partnerships and
  corporations..........................        931         1,539     2,656
                                             ------       -------   -------
Income (loss) from continuing
  operations............................        505        (5,751)   (3,389)
Discontinued Beacon Construction
  Company...............................
  Income (loss) from operations.........        102           440       136
  Loss on sale..........................         --            --        --
                                             ------       -------   -------
Gain on sale of property................         --            --        --
                                             ------       -------   -------
Income (loss) before extraordinary
  items.................................        607        (5,311)   (3,253)
Extraordinary items.....................      8,898         1,554
                                             ------       -------   -------
Net income (loss).......................     $9,505       $(3,757)  $(3,253)
                                             ======       =======   =======
PER UNIT DATA:
Income before extraordinary items.......         --            --        --
Extraordinary items.....................         --            --        --
                                             ------       -------   -------
Net income..............................
                                             ======       =======   =======
Distributions declared..................         --            --        --
                                             ------       -------   -------
Distributions paid......................         --            --        --
Weighted average units outstanding......         --            --        --
</TABLE>
 
                                       15
<PAGE>   24
<TABLE>
<CAPTION>
                                                                  BEACON PARTNERSHIP
                                     -----------------------------------------------------------------------------
                                      NINE MONTHS     NINE MONTHS    FOR THE YEAR   FOR THE YEAR   FOR THE PERIOD
                                         ENDED           ENDED          ENDED          ENDED       MAY 26, 1994 TO
                                     SEPTEMBER 30,   SEPTEMBER 30,   DECEMBER 31,   DECEMBER 31,    DECEMBER 31,
                                         1997            1996            1996           1995            1994
                                     -------------   -------------   ------------   ------------   ---------------
                                      (UNAUDITED)     (UNAUDITED)
                                                    (DOLLARS IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
<S>                                  <C>             <C>             <C>            <C>            <C>
BALANCE SHEET INFORMATION:
Real estate before accumulated
 depreciation.......................  $2,370,759      $1,061,413     $ 1,691,530     $ 471,142        $ 385,852
Total assets........................   2,470,954       1,142,378       1,778,913       534,723          385,565
Mortgage debt.......................     586,925         440,525         452,212        70,536           90,936
Note Payable, Beacon Credit
 Facility...........................     249,000          18,000         153,000       130,500          130,300
Total liabilities...................     910,720         508,727         671,283       239,009          260,468
Total partners capital..............   1,223,812         633,651       1,107,630       295,714          139,691
OTHER DATA:
Funds from Operations (FFO) after
 allocation of Series A
 Preferred Unit Distributions(2)....  $  121,928          55,343     $    83,154     $  41,913        $  17,262
 Cash Flows provided by (used by):
 Operating activities...............     119,288          59,618          92,232        32,963           11,155
 Investing activities...............    (545,909)       (521,776)     (1,097,870)     (145,924)        (233,830)
 Financing activities...............     424,126         470,438       1,037,053       102,636          237,481
RATIOS:
 Interest Coverage(3)(5)............         3.7             3.0             3.1           3.1              2.7
 Fixed Charge Coverage(4)(5)........         3.2             2.9             2.9           2.9              2.6
 Debt to Total Assets...............       33.8%           40.1%            34.0%         37.6%            57.4%
 Secured Debt to Total Assets.......       23.8%           40.1%            34.0%         37.6%            57.4%
 Unencumbered Assets to Total
   Unsecured Debt...................         5.5             n/a             n/a           n/a              n/a
 
- ---------------
(1) Depreciation and amortization...  $    3,086      $    2,999     $     4,033     $   2,306        $   3,013
    Interest-amortization of
    financing cost..................         673             673     $       898     $     853        $     796
 
<CAPTION>
                                               BEACON PREDECESSOR
                                      -------------------------------------
                                      FOR THE PERIOD        YEAR ENDED
                                      JANUARY 1, 1993      DECEMBER 31,
                                        TO MAY 25,      -------------------
                                           1994           1993       1992
                                      ---------------   --------   --------
 
<S>                                   <C>               <C>        <C>
BALANCE SHEET INFORMATION:
Real estate before accumulated
 depreciation.......................     $ 82,198       $ 81,220   $ 78,580
Total assets........................       77,470         85,497     93,327
Mortgage debt.......................       69,240         87,091     86,610
Note Payable, Beacon Credit
 Facility...........................           --             --         --
Total liabilities...................      129,836        143,451    142,015
Total partners capital..............      (52,366)       (57,954)   (48,688)
OTHER DATA:
Funds from Operations (FFO) after
 allocation of Series A
 Preferred Unit Distributions(2)....           --             --         --
 Cash Flows provided by (used by):
 Operating activities...............          241          5,408     10,069
 Investing activities...............       (1,102)        (9,890)    (2,091)
 Financing activities...............         (716)          (830)    (3,983)
RATIOS:
 Interest Coverage(3)(5)............           --             --         --
 Fixed Charge Coverage(4)(5)........           --             --         --
 Debt to Total Assets...............           --             --         --
 Secured Debt to Total Assets.......           --             --         --
 Unencumbered Assets to Total
   Unsecured Debt...................           --             --         --
- ---------------
(1) Depreciation and amortization...
    Interest-amortization of
    financing cost..................
</TABLE>
 
(2) Beacon Partnership believes that to facilitate a clear understanding of the
    operating results of Beacon Partnership, Funds from Operations ("FFO")
    should be examined in conjunction with net income. The definition of FFO was
    clarified in the NAREIT White Paper, adopted by the NAREIT Board of
    Governors on March 3, 1995, as net income (computed in accordance with GAAP,
    excluding gains (or losses) from debt restructuring and sales of property,
    plus depreciation and amortization (in each case only real estate related
    assets), and after adjustments for unconsolidated partnerships and joint
    ventures. Adjustments for unconsolidated partnerships and joint ventures
    will be calculated to reflect FFO on the same basis. FFO should not be
    considered as a substitute for net income as an indication of Beacon
    Partnership's performance or as a substitute for cash flow as a measure of
    its liquidity. Beacon Partnership's method of calculating FFO may be
    different from methods used by other companies.
 
(3) For purposes of computing the ratio of EBITDA to interest expense, EBITDA
    represents earnings before interest, taxes, depreciation and amortization.
    Interest expense includes Beacon Partnership's pro rata share of joint
    venture interest expense.
 
(4) For purposes of computing the ratio of EBITDA to fixed charges, EBITDA
    represents earnings before interest, taxes, depreciation and amortization.
    Fixed charges consist of interest costs, whether expensed or capitalized and
    including Beacon Partnership's pro rata share of joint venture interest
    expense, principal amortization including Beacon Partnership's pro rata
    share of joint venture principal amortization, plus any distributions on
    outstanding preferred units.
 
(5) EBITDA (i) does not represent cash flow from operations as defined by GAAP,
    (ii) should not be considered as an alternative to net income (determined in
    accordance with GAAP) as a measure of operating performance, and (iii) is
    not an alternative to cash flows as a measure of liquidity. Beacon
    Partnership's management believes that in addition to cash flows and net
    income, EBITDA is a useful financial performance measurement for assessing
    the operating performance of a company because, together with net income and
    cash flows, EBITDA provides investors with an additional basis to evaluate
    the ability of a company to incur and service debt and to fund acquisitions
    and other capital expenditures. To evaluate EBITDA and the trends it
    depicts, the components of EBITDA, such as revenues and operating expenses,
    should be considered. Beacon Partnership's method of calculating EBITDA may
    be different from the methods used by other companies.
 
                                       16
<PAGE>   25
 
                                  RISK FACTORS
 
     In considering whether to approve the Partnership Merger, the Agreement and
the transactions contemplated thereby, Beacon Unitholders should carefully
consider, in addition to the other information in this Proxy
Statement/Prospectus, the following matters:
 
UNIT VALUE FLUCTUATIONS THROUGH THE EFFECTIVE TIME
 
     Each EOP Partnership Unit to be received by Beacon Unitholders in the
Partnership Merger will be redeemable for one EOP Common Share or, at EOP's
option, the cash equivalent thereof. Consequently, the value of the EOP
Partnership Units received in the Partnership Merger will be directly affected
by price fluctuations of the EOP Common Shares through the Effective Time. The
value of the EOP Partnership Units and the Beacon Partnership Units, as
reflected in the relative market prices of the EOP Common Shares and the Beacon
Common Shares at the Effective Time, may vary significantly from the value as
reflected in such prices as of the date of execution of the Agreement, the date
hereof, the date of the Beacon Partnership Special Meeting due to changes in the
business, operations and prospects of EOP or Beacon, market assessments of the
likelihood that the Mergers will be consummated and the timing thereof, general
market and economic conditions and other factors such as market perception of
REIT shares and office REIT shares generally.
 
     The Exchange Ratio was fixed at 1.4063 at the time of execution of the
Agreement by the parties and is not subject to adjustment. Any increase or
decrease of the market price of the EOP Common Shares will correspondingly
increase or decrease the value of the Merger Consideration to be received by the
Beacon Unitholders pursuant to the Partnership Merger. In considering whether to
approve the Partnership Merger and the Agreement, Beacon Unitholders should
consider the risks associated with a potential change in the price of EOP Common
Shares between the date of this Proxy Statement/Prospectus and the Effective
Time. In this respect, EOP completed its IPO in July 1997 and, consequently, EOP
Common Shares have a limited trading history in the public market.
 
UNIT VALUE FLUCTUATIONS AFTER THE EFFECTIVE TIME
 
     There can be no assurance as to the value of the EOP Partnership Units, as
implied by the market price of the EOP Common Shares, after the Effective Time.
Events outside the control of EOP which could adversely affect the market value
of EOP Partnership's assets, as well as the market price of the EOP Common
Shares and the value of the EOP Partnership Units, may occur after the Effective
Time. See "-- Ownership of EOP Common Shares" below.
 
FAILURE TO EFFECTIVELY MANAGE RAPID GROWTH; EXPANSION INTO NEW MARKETS
 
     EOP currently is experiencing a period of rapid growth. After the Mergers,
EOP will own or have an interest in (i) 245 office properties containing
approximately 62.0 million rentable square feet of office space, representing an
approximate 92% increase in the office space in EOP's portfolio since EOP's IPO
in July 1997, and (ii) 17 stand-alone parking facilities containing
approximately 16,749 parking spaces, representing an approximate 13% increase in
the parking spaces in EOP's portfolio since EOP's IPO. Additionally, in
connection with the Mergers, EOP will substantially expand its operations in
Boston and extend its operations to suburban San Francisco. EOP's ability to
manage this growth effectively will require it to apply successfully its
experience managing its existing portfolio to new markets and to an increased
number of properties. The failure to effectively manage rapid growth, including
the growth resulting from the Mergers, could have a material adverse effect on
the operating results of unit and financial condition of EOP and, consequently,
on EOP Partnership's cash flow and ability to make expected distributions to its
limited partners.
 
REDUCTIONS IN DISTRIBUTIONS PER UNIT FOR BEACON UNITHOLDERS AFTER THE MERGERS
 
     Assuming EOP Partnership continues to make regular quarterly distributions
at its current rate of $.30 per unit after the Merger, each Beacon Unitholder
will receive an equivalent quarterly distribution payment of $.42 per unit, as
compared to Beacon's most recent quarterly distribution of $.50 per unit. Based
on the
 
                                       17
<PAGE>   26
 
Exchange Ratio, the Beacon Unitholders will receive an adjusted distribution of
$1.69 per unit, representing a 16% decline from the Beacon Unitholders' current
annual distribution of $2.00 per unit.
 
     Under the EOP Partnership Agreement, amounts of the distributions paid to
the limited partners are and will be within the discretion of EOP, as managing
general partner of EOP Partnership. If EOP, as managing general partner of EOP
Partnership, determines to reduce or otherwise limit the amount of such
distributions by EOP Partnership, the limited partners may not receive
anticipated distributions, which may adversely affect the financial planning of
such limited partners.
 
CONFLICTS OF INTEREST ARISING FROM BENEFITS TO CERTAIN DIRECTORS AND OFFICERS OF
BEACON
 
     In considering the recommendation of the Beacon Board with respect to the
Mergers, the Agreement and the transactions contemplated thereby, Beacon
Unitholders should be aware that conflicts of interest exist due to the fact
that certain members of the Beacon Board and the management of Beacon have
certain interests in, and will receive benefits from, the Mergers that are
different from, or in addition to, the interests of, and the benefits to, Beacon
Unitholders generally. See "THE MERGERS -- Interests of Certain Persons in the
Mergers." The Beacon Board was aware of these conflicts of interest and benefits
and considered them, among other matters, in deciding whether to approve the
Mergers, the Agreement and the transactions contemplated thereby.
 
     Beacon has entered into Senior Executive Severance Agreements with each of
Alan Leventhal and Lionel Fortin and has an Executive Severance Plan covering
all Senior Vice Presidents of Beacon Properties Corporation that, under certain
circumstances, entitle each officer to receive severance payments (aggregating
approximately $9.7 million), performance bonuses (aggregating approximately
$31.3 million), payments for taxes (currently estimated to aggregate
approximately $18.8 million) and other benefits if the officer's employment is
terminated following a change in control of Beacon. In addition, as of November
12, 1997, Beacon had granted to its executive officers options to purchase a
total of 2,418,333 Beacon Common Shares, of which a total of 343,336 were
vested. According to the terms of such options, all options which are not
currently vested will become fully vested and immediately exercisable in
connection with the Mergers. In the event that the executive officers exercise
such options, then, assuming a $41 11/16 per share price of Beacon Common
Shares, (the closing price of Beacon Common Shares on November 12, 1997) the
aggregate value (net of exercise prices) to the holders of such options would be
approximately $34.7 million. Certain officers and directors of Beacon and
members of their families will benefit from certain agreements which are
intended to permit such persons, in their capacity as holders of Beacon
Partnership Units, to continue to defer federal taxable income that otherwise
might be recognized by them upon the sale or refinancing of indebtedness with
respect to certain Beacon Properties. In addition, trusts affiliated with
Messrs. Alan Leventhal and Sidman will receive payments under the Stock Purchase
Agreements for their interests in the Beacon Service Companies. See "THE
MERGERS -- Interests of Certain Persons in the Mergers."
 
     Because of these potential conflicts of interest, the compensation
committee of the Beacon Board evaluates and negotiates on behalf of Beacon any
compensation, severance and other plans, arrangements or transactions involving
Beacon's management. The compensation committee retained its own independent
counsel. Beacon believes that the Beacon Unitholders will not be adversely
affected by any of such compensation, severance and other plans or arrangements.
 
LIMITED CONTROL OVER BUSINESS OF EOP PARTNERSHIP
 
     All decisions regarding the business and operations of EOP Partnership
following the Mergers will be made by EOP, which will continue to serve as
managing general partner of EOP Partnership. Under the EOP Partnership
Agreement, the limited partners of EOP Partnership may not remove EOP as the
managing general partner. The inability to remove EOP from such position may not
necessarily be in the limited partners' interest because the managing partner
may pursue policies or actions that the limited partners believe are adverse to
their interests.
 
                                       18
<PAGE>   27
 
     The limited partners of EOP Partnership have no control over actions of EOP
as managing general partner, and do not take part in the operation, management
or control of the business of EOP Partnership. The limited partners of EOP
Partnership have no rights with respect to the election of the EOP Board.
 
RISKS OF OWNERSHIP OF EOP PARTNERSHIP UNITS
 
     RESTRICTIONS ON TRANSFER OF UNITS.  The EOP Partnership Agreement provides
for certain restrictions on a limited partner's ability to transfer his or her
EOP Partnership Units. Subject to certain exceptions, a limited partner may not
transfer all or any portion of his or her EOP Partnership Units without (i)
providing written notice to the managing general partner, which will have ten
days in which to exercise its right of first refusal to acquire the limited
partner's EOP Partnership Units, and (ii) meeting certain other requirements set
forth in the EOP Partnership Agreement. Notwithstanding this general
prohibition, a limited partner of EOP Partnership may transfer his, her or its
EOP Partnership Units (i) to any general partner of EOP Partnership, (ii) to his
or her parent(s), spouse or descendants, nephews, nieces, brothers and sisters,
(iii) to a trust for the benefit of a charitable beneficiary or to a charitable
foundation, subject to certain limitations, or (iv) subject to certain
limitations, make pledges or other collateral transfers effected to secure the
repayment of a bona fide loan or other extension of credit. A "transfer" does
not include the conversion of a preferred unit into one or more EOP Partnership
Units nor the conversion of an EOP Partnership Unit into an EOP Common Share.
Notwithstanding the fact that EOP Partnership Units are redeemable for the cash
equivalent of EOP Common Shares, for which there is an active market (or at the
option of EOP, for EOP Common Shares), these restrictions may limit a limited
partner's ability to liquidate his, her or its investment in EOP Partnership
Units quickly.
 
     NO PUBLIC MARKET.  There is no public market for EOP Partnership Units.
However, the EOP Partnership Agreement provides that limited partners may,
subject to certain limitations, redeem their EOP Partnership Units for (i) EOP
Common Shares on a one-on-one basis or (ii) cash equal to the fair market value
of the EOP Common Shares into which such EOP Partnership Units would otherwise
have been converted. The determination of whether the redeeming party receives
cash or EOP Common Shares is within the sole discretion of EOP.
 
ISSUANCE OF PREFERRED UNITS
 
     The EOP Partnership Agreement provides that EOP, as the managing general
partner may, in its sole discretion, issue additional units of partnership
interest with rights and preferences that may be senior to those of EOP
Partnership Units. Such preferred units are available for issuance without
further action by the limited partners of EOP Partnership. To the extent
preferred units are issued, the holders of EOP Partnership Units may be
adversely affected because the holders of such additional units may have a
priority on distributions with respect to EOP Partnership Units or priority upon
the liquidation of the assets of EOP Partnership. The rights and preferences
associated with such additional units may also prevent distributions to the
holders of EOP Partnership Units until the obligations of EOP Partnership with
respect to such additional units are satisfied.
 
NO APPRAISAL RIGHTS IN CONNECTION WITH THE PARTNERSHIP MERGER
 
     Limited partners of Beacon Partnership are not entitled to dissenters'
appraisal rights under Delaware law or the Beacon Partnership Agreement in
connection with the Partnership Merger.
 
PAYMENTS IF THE AGREEMENT IS TERMINATED
 
     No assurance can be given that the Mergers will be consummated. The
Agreement provides for the payment by Beacon of a break-up fee of up to $75
million if the Agreement is terminated by EOP or Beacon under certain
circumstances. In addition, the Agreement provides for reimbursement of expenses
by EOP or Beacon of up to $10 million if the Agreement is terminated by EOP or
Beacon under certain other circumstances. Such payment obligations may adversely
affect the ability of EOP or Beacon to engage in another transaction in the
event the Mergers are not consummated and may have an adverse impact on the
 
                                       19
<PAGE>   28
 
financial condition of the company incurring such payment obligations. See "THE
MERGERS -- Fees and Expenses."
 
POSSIBILITY THAT THE EXPECTED BENEFITS OF MERGERS WILL NOT BE REALIZED
 
     The amount of the Merger Consideration (based upon the closing price of the
EOP Common Shares on September 12, 1997) to be paid by EOP Partnership to the
Beacon Unitholders represents a 28.4% premium over the value of the Beacon
Partnership Units, as implied by the closing price of the Beacon Common Shares
on September 12, 1997 (the last trading day prior to the public announcement of
the Merger). Nevertheless, based on anticipated savings in expenses and other
factors, the Mergers have an accretive (rather than a dilutive) effect on EOP
Partnership's Funds from Operations per unit on a pro forma basis for 1996 and
for the nine months ended September 30, 1997 and are expected to have an
accretive effect for future periods. See "SUMMARY UNAUDITED PRO FORMA COMBINED
FINANCIAL DATA." However, no assurance can be given that the Mergers will not
have a dilutive effect on EOP Partnership's Funds from Operations per unit.
 
REAL ESTATE RISKS
 
     GENERAL.  Real property investments are subject to varying degrees of risk.
The yields from equity investments in real estate depend on the amount of income
generated and expenses incurred. If EOP's properties do not, in the future,
generate income sufficient to meet operating expenses, debt service and capital
expenditures, EOP Partnership's ability to make distributions to its limited
partners will be adversely affected. Income from properties may be adversely
affected by the general economic climate, local conditions such as oversupply of
office properties or a reduction in demand for office properties in the area,
the attractiveness of the properties to tenants, competition from other
available office properties, inability to collect rent from tenants, changes in
market rental rates, the need to periodically repair, renovate and relet space,
and the ability of the owner to pay for adequate maintenance and insurance and
increased operating costs (including real estate taxes). EOP's income also would
be adversely affected if a significant number of tenants were unable to pay rent
or office properties could not be rented on favorable terms. Certain significant
expenditures associated with each equity investment (such as mortgage payments,
if any, real estate taxes and maintenance costs) generally are not reduced when
circumstances cause a reduction in income from the investment. If a property is
mortgaged to secure payment of indebtedness, and if EOP is unable to meet its
mortgage payments, a loss could be sustained as a result of foreclosure on the
mortgage. In addition, income from properties and real estate values also are
affected by such factors as applicable laws, including tax laws, interest rate
levels and the availability of financing.
 
     RENEWAL OF LEASES AND RELETTING OF SPACE.  EOP is subject to the risks that
leases may not be renewed, space may not be relet or the terms of renewal or
reletting (including the cost of required renovations) may be less favorable
than current lease terms. As of September 30, 1997, leases will expire prior to
2003 on a total of approximately 55% of the rentable square feet in the EOP
Office Properties and, as of September 30, 1997, on a total of approximately 64%
of the rentable square feet in the Beacon Properties, for a weighted average of
58% for all such properties. If EOP were unable to promptly relet or renew the
leases for all or a substantial portion of this space, if the rental rates upon
such renewal or reletting were significantly lower than expected rates or if its
reserves for these purposes proved inadequate, then the operating results and
financial condition of EOP may be adversely affected, and, consequently, EOP
Partnership's cash flow and ability to make expected distributions to its
limited partners may be adversely affected.
 
     RISK OF ACQUISITION ACTIVITIES.  As of November 12, 1997, EOP owned or had
interests in 114 office properties containing approximately 39.8 million
rentable square feet. Upon consummation of the Mergers (assuming consummation of
all Probable Acquisitions and no additional acquisitions by either EOP or
Beacon), EOP will increase its number of office properties to 245 (a 115%
increase) and its rentable square feet of office space to approximately 62.0
million (a 56% increase). Certain of the Beacon Properties to be acquired by EOP
in the Mergers are in markets where EOP has not historically owned and managed a
substantial number of properties, including Boston, suburban Boston, and
suburban San Francisco. Due primarily to the number and expanded geographic
diversity of its properties after the Mergers, EOP may not
 
                                       20
<PAGE>   29
 
have adequate management or other personnel or adequate systems or other
resources to manage its portfolio or its properties to the same level of
efficiency after the Mergers, which could adversely affect operations and result
in less distributions to limited partners. Additionally, one of the anticipated
benefits of the Mergers is the elimination of redundant activities in the
combined organization and the resulting savings in costs and expenses. An
inability to achieve these savings could have a material adverse effect on the
operating results and financial condition of EOP Partnership, and, consequently,
on EOP Partnership's cash flow and ability to make expected distributions to
limited partners.
 
     EOP intends to actively continue to acquire office and parking properties.
See "BUSINESS OF EOP -- Business and Growth Strategies." Acquisitions of office
and parking properties entail risks that investments will fail to perform in
accordance with expectations. Estimates of the costs of improvements to bring an
acquired property up to standards established for the market position intended
for that property may prove inaccurate. In addition, the general investment
risks described below under "-- Uncontrollable Factors Affecting Performance and
Value" are associated with any new real estate investment. Finally, EOP expects
that there will be significant competition for attractive investment
opportunities from other major real estate investors with significant capital,
including publicly traded REITs, private REITs and private institutional
investment funds. Such competition has resulted in certain markets, and may
result in other markets, in increased prices for office properties. EOP
anticipates that future acquisitions will be financed through secured or
unsecured financings and proceeds from equity or debt offerings by EOP or EOP
Partnership, including EOP Partnership's $1.5 billion unsecured credit facility
and its $600 million unsecured revolving line of credit (collectively, the
"Credit Facilities"). No assurance can be given that EOP will have the
opportunity in the future to make suitable property acquisitions on terms
favorable to EOP. See "EOP PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS -- Liquidity and Capital
Resources."
 
     UNCONTROLLABLE FACTORS AFFECTING PERFORMANCE AND VALUE.  EOP Unitholders
will bear risks associated with real property investments. The yields available
from equity investments in real estate depend in large part on the amount of
income generated and expenses incurred. The economic performance and value of
EOP Partnership's real estate assets will be subject to all of the risks
incident to the ownership and operation of real estate. These include the risks
normally associated with changes in general national, regional and local
economic and market conditions. Such local real estate market conditions may
include excess supply and intense competition for tenants, including competition
based on rental rates, attractiveness and location of the property and quality
of maintenance, insurance and management services. Other factors that may
adversely affect the performance and value of a property include changes in laws
and governmental regulations (including those governing usage, zoning and
taxes), changes in interest rates, the availability of financing and the
possibility of bankruptcies of tenants. To the extent that the value and/or
performance of its properties are adversely affected by any of the foregoing
factors, EOP Partnership's financial condition and results of operations would
be adversely affected.
 
     ILLIQUIDITY OF REAL ESTATE INVESTMENTS.  Because real estate investments
are relatively illiquid, EOP Partnership's ability to vary its portfolio
promptly in response to economic or other conditions is limited. In addition,
certain significant expenditures, such as debt service, real estate taxes, and
operating and maintenance costs generally are not reduced in circumstances
resulting in a reduction in income from the investment. The foregoing and any
other factor or event that would impede the ability of EOP Partnership to
respond to adverse changes in the performance of its investments could have an
adverse effect on EOP Partnership's financial condition and results of
operations, with a consequent adverse effect on EOP Partnership's ability to
make expected distributions to limited partners.
 
     UNINSURED LOSS.  EOP Partnership and Beacon Partnership carry comprehensive
liability, fire, extended coverage and rental loss insurance covering all of the
EOP Properties and the Beacon Properties, respectively, and EOP Partnership
intends to continue to carry such insurance on all of its properties after the
Mergers, with policy specifications and insured limits which EOP Partnership
believes are adequate and appropriate under the circumstances. There are,
however, certain types of losses that generally are not insured because it is
not economically feasible to insure against such losses. Should an uninsured
loss or a loss in excess of insured limits occur, EOP Partnership could lose its
capital invested in the applicable property, as well as the
 
                                       21
<PAGE>   30
 
anticipated future revenue from such property and, in the case of debt which is
with recourse to EOP Partnership, would remain obligated for any mortgage debt
or other financial obligations related to such property. EOP Partnership and
Beacon Partnership carry earthquake insurance on all of the EOP Properties and
the Beacon Properties, respectively, including those located in California,
subject to coverage limitations which EOP Partnership and Beacon, respectively,
believe are commercially reasonable. In light of the California earthquake risk,
California building codes since the early 1970s have established construction
standards for all new buildings. The current and strictest construction
standards were adopted in 1987. Of the 19 EOP Properties located in California,
nine have been built since January 1, 1988 and EOP Partnership believes that all
of the EOP Properties were constructed in full compliance with the applicable
standards existing at the time of construction. Of the 24 Beacon Properties
located in California, three have been built since January 1, 1988 and Beacon
believes that all of the Beacon Properties were constructed in full compliance
with the applicable standards existing at the time of construction. No assurance
can be given that material losses in excess of insurance proceeds will not occur
in the future.
 
DEBT FINANCING
 
     DEBT FINANCING AND EXISTING DEBT MATURITIES.  All outstanding indebtedness
of EOP is debt of EOP Partnership or a Subsidiary of EOP Partnership. EOP
Partnership is subject to risks normally associated with debt financing,
including the risk that EOP Partnership's cash flow will be insufficient to pay
distributions at expected levels and meet required payments of principal and
interest, the risk that existing indebtedness (which in virtually all cases will
not be fully amortized at maturity) will not be able to be refinanced or that
the terms of such refinancing will not be as favorable as the terms of existing
indebtedness. EOP Partnership has substantial outstanding indebtedness
(approximately $2.5 billion on a pro forma basis (after giving effect to the
IPO, $180 million of EOP Unsecured Notes issued in September 1997, borrowings
under the Credit Facilities, properties acquired after September 30, 1997 and
all Probable Acquisitions)) and, on a pro forma basis after giving effect to the
Mergers, will have approximately $3.5 billion in outstanding indebtedness. See
"THE EOP PROPERTIES -- Debt Financing" and "THE BEACON PROPERTIES -- Mortgage
Indebtedness and Credit Facility." If principal payments due at maturity cannot
be refinanced, extended or paid with proceeds of other capital transactions,
such as new equity capital, EOP Partnership expects that its cash flow will not
be sufficient in all years to pay distributions at expected levels and to repay
all such maturing debt. Furthermore, if prevailing interest rates or other
factors at the time of refinancing (such as the possible reluctance of lenders
to make commercial real estate loans) result in higher interest rates upon
refinancing, the interest expense relating to such refinanced indebtedness would
increase, which would adversely affect EOP Partnership's cash flow and the
amount of distributions it can make to its limited partners. If a property is
mortgaged to secure payment of indebtedness and EOP Partnership is unable to
meet mortgage payments, the property could be foreclosed by or otherwise
transferred to the mortgagee with a consequent loss of income and asset value to
EOP Partnership. EOP Partnership's mortgages contain customary negative
covenants limiting, among other things, EOP's ability, without the prior consent
of the lender, to enter into new or materially modify existing leases of a
material nature, to transfer interests in the mortgagor entity (including
mortgage interests) and to discontinue insurance coverage. Nine of EOP
Partnership's mortgage loans are cross-defaulted to, and cross-collateralized
with, each other. If an event of default were to occur under any of these loans,
EOP Partnership could be required to repay the aggregate of all such loans
(approximately $130.6 million), together with any applicable prepayment charges,
in order to avoid foreclosure on all such EOP Properties. Two of Beacon's
mortgage loans are cross-defaulted to, and cross-collateralized with, each
other. If an event of default were to occur under any of these loans after the
Mergers, EOP could be required to repay the aggregate of all such loans
(approximately $28.6 million), together with any applicable prepayment charges,
in order to avoid foreclosure on all such Beacon Properties. Foreclosure on such
Properties, or EOP Partnership's inability to refinance such loans on terms as
favorable as the existing terms, would negatively impact EOP Partnership's
financial condition and results of operations.
 
     DEGREE OF LEVERAGE.  EOP Partnership's Debt to Market Capitalization Ratio
is approximately 29% (on a pro forma basis after giving effect to the Mergers)
as of November 12, 1997. EOP Partnership has adopted a policy of incurring debt,
either directly or through EOP Partnership, only if upon such incurrence EOP
Partnership's Debt to Market Capitalization Ratio would be approximately 50% or
less. The degree to which
 
                                       22
<PAGE>   31
 
EOP Partnership is leveraged could have important consequences to EOP
Unitholders, including affecting EOP Partnership's ability to obtain additional
financing in the future for working capital, capital expenditures, acquisitions,
development or other general partnership purposes and making EOP Partnership
more vulnerable to a downturn in its business or the economy generally. The
Indenture which governs the issuance of the EOP Unsecured Notes contains
financial and operating covenants including, among other things, limitations on
EOP Partnership's ability to incur other indebtedness, sell all or substantially
all of its assets and engage in mergers and consolidations and certain
acquisitions. See "EOP PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS."
 
     RISK OF RISING INTEREST RATES AND VARIABLE RATE DEBT.  EOP, through EOP
Partnership, entered into the $600 million Credit Facility in July 1997 and
entered into the $1.5 billion Credit Facility in October 1997. Advances under
the Credit Facilities bear interest at a variable rate based upon LIBOR. EOP
Partnership has entered into interest rate hedging agreements for approximately
$1.0 billion of its floating rate debt to limit its exposure to rising interest
rates. Although the hedging agreements enable EOP Partnership to convert
floating rate liabilities to fixed rate liabilities, they expose EOP Partnership
to the risk that the counterparties to a hedge agreement may not perform, which
could cause EOP Partnership to lose the benefits of the hedge agreement. The
counterparties to such interest rate hedging agreements are all major financial
institutions. EOP Partnership may incur other variable rate indebtedness in the
future. Increases in interest rates on such indebtedness, or the loss of the
benefits of the anticipated hedging agreements, could increase EOP's interest
expense, which would adversely affect EOP Partnership's cash flow and its
ability to pay expected distributions to its limited partners. Accordingly, EOP
Partnership may in the future engage in other transactions to further limit its
exposure to rising interest rates as appropriate and cost effective. See "EOP
PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
RESULTS OF OPERATIONS -- Liquidity and Capital Resources."
 
CONCENTRATION OF PROPERTIES IN CERTAIN MARKETS
 
     Upon consummation of the Mergers, approximately 14.3% and 17.6% of EOP's
office properties (in number of buildings) and 12.1% and 15.6% (in square
footage) will be located in Boston (including suburban Boston) and California,
respectively. Of the 43 EOP and Beacon office properties located in California,
16 are located in Southern California. EOP's revenue from, and the value of, its
properties in these markets may be affected by a number of factors, including
the local economic climate (which may be adversely impacted by business layoffs
or downsizing, industry slowdowns, changing demographics and other factors) and
local real estate conditions (such as oversupply of, or reduced demand for,
office and other competing commercial properties). Therefore, EOP Partnership's
performance and its ability to make distributions to its limited partners will
likely be dependent, in part, on the economic conditions in these markets.
California recently began to recover from an economic recession which affected
Southern California in particular since the early 1990s. Additionally, the
Boston area has recently begun to experience some recovery from a severe
economic downturn in real estate markets that occurred in the late 1980s and
early 1990s. No assurances can be given that economic conditions in these market
areas will continue to improve.
 
FEDERAL INCOME TAX RISKS
 
     TAX STATUS OF EOP PARTNERSHIP.  Hogan & Hartson L.L.P., counsel to EOP,
will provide to EOP and to EOP Partnership an opinion to the effect that EOP
Partnership will be treated as a partnership for federal income tax purposes and
will not be subject to tax as a corporation or an association taxable as a
corporation. EOP Partnership will qualify as a partnership for federal income
tax purposes unless (i) it elects to be treated as a corporation for federal
income tax purposes or (ii) it is considered to be a "publicly traded
partnership" under Section 7704 of the Code. So long as EOP Partnership
qualifies as a partnership, EOP Partnership generally will not be subject to
federal income tax and the partners of EOP Partnership will be required to take
into account in computing their federal income tax liability their allocable
shares of income, gains, losses, deductions and credits of the partnership,
regardless of whether cash distributions are made by the partnership to the
partners. EOP Partnership has not elected, and will not elect, to be treated as
a corporation. If EOP
 
                                       23
<PAGE>   32
 
Partnership were considered to be a "publicly traded partnership," it would be
taxed as a corporation unless at least 90 percent of its income consists of
"qualifying income." EOP and EOP Partnership believe that it is not likely that
EOP Partnership will be treated as a "publicly traded partnership" and, in any
event, that EOP Partnership will have sufficient "qualifying income" so as to
avoid taxation as a corporation, even if it were considered a "publicly traded
partnership." However, if EOP Partnership were a "publicly traded partnership,"
a partner would be subject to certain restrictions with respect to the use of
passive losses. See "FEDERAL INCOME TAX CONSIDERATIONS -- Tax Status of EOP
Partnership."
 
     TAX CONSEQUENCES OF THE PARTNERSHIP MERGER.  The receipt of EOP Partnership
Units in the Partnership Merger generally is not expected to result in the
recognition of taxable income or gain by a Beacon Unitholder at the time of the
Partnership Merger, except to the extent that such Beacon Unitholder receives a
distribution (or a deemed distribution resulting from the relief from
liabilities) of cash in excess of such Beacon Unitholder's aggregate adjusted
tax basis in his or her Beacon Partnership Units. However, the particular tax
consequences of the Partnership Merger for each Beacon Unitholder will depend on
a number of factors related to the tax situation of that individual Unitholder,
including such Beacon Unitholder's adjusted tax basis in its Beacon Partnership
Units at the time of the Partnership Merger, the assets that the Beacon
Unitholder originally contributed to Beacon Partnership in exchange for his or
her Beacon Partnership Units, the indebtedness, if any, of Beacon Partnership
secured by such contributed assets at the time of the Partnership Merger, the
tax basis of such assets in the hands of Beacon Partnership at the time of the
Partnership Merger, such Beacon Unitholder's share of the "unrealized gain" with
respect to Beacon Partnership's assets at the time of the Partnership Merger,
and the extent to which the Beacon Unitholder includes in its basis for its
Beacon Partnership Units a share of Beacon Partnership's recourse liabilities by
reason of indemnification or "deficit restoration" obligations that will be
eliminated by reason of the Partnership Merger. See "FEDERAL INCOME TAX
CONSIDERATIONS -- Tax Consequences of the Partnership Merger." Although the
Partnership Merger is intended to permit Beacon Unitholders to defer the taxable
gain that they otherwise would recognize in a fully taxable transaction, the IRS
might contend that at least some Beacon Unitholders must recognize gain in
connection with the Partnership Merger. Each Beacon Unitholder is urged to
consult with his or her own tax advisor in order to determine the anticipated
tax consequences of the Partnership Merger for such Beacon Unitholder in light
of his or her specific circumstances.
 
     EFFECTS OF SUBSEQUENT EVENTS UPON RECOGNITION OF GAIN.  In addition to any
gain that might be recognized by a Beacon Unitholder at the time of the
Partnership Merger, a variety of future events and transactions could cause some
or all of the former Beacon Unitholders holding EOP Partnership Units as a
result of the Partnership Merger to recognize part or all of the taxable gain
that has been deferred either through the original contribution of assets to
Beacon Partnership in exchange for Beacon Partnership Units or through the
Partnership Merger. See "FEDERAL INCOME TAX CONSIDERATIONS -- Effect of
Subsequent Events." EOP, as the managing general partner of EOP Partnership, is
not required to take into account the tax consequences to the limited partners
in deciding whether to cause EOP Partnership to undertake specific transactions
that could cause the limited partners to have to recognize gain, and the limited
partners generally have no right to approve or disapprove such transactions.
 
     REDEMPTION OF UNITS; SALE OF ASSETS; DISSOLUTION OF PARTNERSHIP.  The
receipt of cash or EOP Common Shares by partners upon the exercise of the Unit
Redemption Right or the eventual liquidation of EOP Partnership will be a
taxable transaction and is likely to result in the recognition by the partners
of substantial gain for federal income tax purposes. State and local income and
transfer taxes may apply to such transactions as well. Furthermore, if EOP
Partnership were to sell any of the assets acquired from Beacon Partnership in
the Partnership Merger that have "unrealized gain" at the time of the
Partnership Merger (i.e., that have a value at the time of the Partnership
Merger in excess of their adjusted tax basis at such time), former Beacon
Unitholders would be specially allocated by EOP Partnership an amount of taxable
gain equal to such "unrealized gain." See "FEDERAL INCOME TAX
CONSIDERATIONS -- Tax Treatment of Partners Who Hold EOP Partnership Units After
the Partnership Merger."
 
     OTHER TAX LIABILITIES OF HOLDERS OF EOP PARTNERSHIP UNITS.  In addition to
the federal income tax aspects described above, a Beacon Unitholder should
consider the potential state and local tax consequences
 
                                       24
<PAGE>   33
 
of owning EOP Partnership Units. Tax returns may be required and tax liability
may be imposed both in the state or local jurisdictions where a partner resides
and in each state or local jurisdiction in which EOP Partnership has assets or
otherwise does business. EOP Partnership will hold assets and/or otherwise
conduct business in more than 20 states and the District of Columbia. EOP
Partnership anticipates providing EOP Unitholders with any information
reasonably necessary to permit them to satisfy state and local return filing
requirements. A Beacon Unitholder should consult with his personal tax advisor
with respect to the state and local income tax implications for such Unitholder
of owning EOP Partnership Units.
 
     ADVERSE CONSEQUENCES OF EOP'S FAILURE TO QUALIFY AS A REIT.  EOP believes
that, commencing with its formation on July 11, 1997, it has been organized and
has operated in such a manner so as to qualify for taxation as a REIT under the
Code, and that after giving effect to the Company Merger, its proposed method of
operation will enable it to continue to meet the requirements for qualification
and taxation as a REIT. Although management believes that EOP has and will
continue to be organized and has and will continue to operate in such a manner
so as to qualify as a REIT, no assurance can be given that EOP has been or will
remain so qualified. Qualification as a REIT involves the satisfaction of
numerous requirements (some on an annual and quarterly basis) established under
highly technical and complex Code provisions for which there are only limited
judicial and administrative interpretations, and involves the determination of
various factual matters and circumstances not entirely within EOP's control. For
example, in order to qualify as a REIT, at least 95% of EOP's gross income in
any year must be derived from qualifying sources, and EOP must pay distributions
to shareholders aggregating annually at least 95% of its REIT taxable income
(excluding capital gains). The complexity of these provisions and of the
applicable Treasury Regulations that have been promulgated under the Code is
greater in the case of a REIT, such as EOP, that holds its assets in partnership
form. No assurance can be given that legislation, new regulations,
administrative interpretations or court decisions will not significantly change
the tax laws with respect to qualification as a REIT or the federal income tax
consequences of such qualification. EOP, however, is not aware of any pending
tax legislation that would adversely affect EOP's ability to operate as a REIT.
 
     Hogan & Hartson L.L.P., counsel to EOP, will provide to EOP and to Beacon,
as a condition to the Mergers, an opinion to the effect that commencing with
EOP's formation on July 11, 1997, it has been organized and has operated in such
a manner so as to qualify for taxation as a REIT under the Code and that after
giving effect to the Mergers, EOP's proposed method of operation will enable it
to continue to meet the requirements for qualification and taxation as a REIT
under the Code. Goodwin, Procter & Hoar LLP, counsel to Beacon, will provide to
EOP as a condition to the Merger, an opinion to the effect that, for Beacon's
taxable year ended December 31, 1994, and for all subsequent taxable years
ending on or before the Effective Time, Beacon was organized and has operated in
conformity with the requirements for qualification as a REIT under the Code. See
"FEDERAL INCOME TAX CONSIDERATIONS -- Taxation of EOP as a REIT -- General."
Such legal opinions, however, will be based on various assumptions and factual
representations by EOP and/or Beacon, as applicable, regarding EOP's or Beacon's
ability to meet the various requirements for qualification as a REIT, and no
assurance can be given that actual operating results will meet these
requirements. Such legal opinions are not binding on the IRS or any court.
Moreover, the qualification and taxation of EOP and Beacon as REITs depends upon
their ability to meet on a continuing basis (through actual annual operating
results, distribution levels and diversity of stock ownership) the various
qualification tests imposed under the Code, compliance with which will not be
reviewed by counsel to EOP or Beacon. Hogan & Hartson's opinion as to the
qualification of EOP as a REIT under the Code is not based upon, or limited by,
an assumption or representation that the ZML REITs qualified as REITs for
federal income tax purposes.
 
     If EOP were to fail to qualify as a REIT in any taxable year, EOP would be
subject to federal income tax (including any applicable alternative minimum tax)
on its taxable income at regular corporate rates. Moreover, unless entitled to
relief under certain statutory provisions, EOP also would be disqualified from
treatment as a REIT for the four taxable years following the year during which
qualification was lost. This treatment would significantly reduce the net
earnings of EOP available for investment or distribution to shareholders (but
not holders of EOP Partnership Units) because of the additional tax liability to
EOP for the
 
                                       25
<PAGE>   34
 
years involved. In addition, distributions to shareholders would no longer be
required to be made. See "FEDERAL INCOME TAX CONSIDERATIONS -- Taxation of EOP
as a REIT -- General."
 
     OTHER TAX LIABILITIES.  Even if EOP qualifies as a REIT, it will be subject
to certain federal, state and local taxes on its income and property. In
addition, the net taxable income, if any, from the activities conducted through
the Third Party Service Corporations (as defined herein) will be subject to
federal and state income tax. See "FEDERAL INCOME TAX CONSIDERATIONS -- Other
Tax Consequences for EOP, Its Shareholders and the Third Party Service
Corporations."
 
     ADVERSE CONSEQUENCES IF ZML REITS OR BEACON FAILED TO QUALIFY AS REITS.  If
one or more of the ZML REITs that merged into EOP in connection with the
formation of EOP failed to qualify as a REIT throughout the duration of its
existence prior to formation of EOP, then it might have had undistributed "C
corporation earnings and profits" that, if not distributed by EOP prior to
December 31, 1997, could prevent EOP from continuing to qualify as a REIT.
Similarly, if Beacon has failed to qualify as a REIT throughout the duration of
its existence, then it might have undistributed "C corporation earnings and
profits" that, if not distributed by EOP prior to December 31, 1997, could
prevent EOP from continuing to qualify as a REIT. Beacon believes that Beacon
has qualified as a REIT throughout the duration of its existence, and EOP as a
condition to the Mergers, will receive an opinion from Goodwin, Procter & Hoar
LLP, counsel to Beacon, to that effect. EOP believes that each of the ZML REITs
qualified as a REIT throughout the duration of its existence and that, in any
event, no ZML REIT should be considered to have had any undistributed "C
corporation earnings and profits" at the time of the formation of EOP. In
addition, if a ZML REIT or Beacon failed to qualify as a REIT throughout the
duration of its existence, it would have recognized taxable gain at the time it
was merged into EOP (and EOP would be liable for the tax thereon), even though
such merger otherwise qualified as a "tax-free reorganization" for tax purposes,
unless EOP makes a special election that is available under current law. EOP
intends to make such an election as a protective matter with respect to each of
the ZML REITs and Beacon, which would have the effect of requiring EOP to pay
corporate income tax with respect to any gain existing at the time of
acquisition with respect to assets acquired from the entity that failed to
qualify as a REIT if such assets are sold within 10 years after their
acquisition by EOP. Finally, if one or more of the ZML REITs had failed to
qualify, or if Beacon has failed to qualify as a REIT, EOP could be precluded
from electing REIT status for up to four years after the year in which such ZML
REIT or Beacon failed to so qualify if EOP were determined to be a "successor"
to that ZML REIT or Beacon. See "FEDERAL INCOME TAX CONSIDERATIONS -- Taxation
of EOP as a REIT -- General" and "-- Requirements for Qualification as a REIT."
 
LIMITATIONS ON CHANGES IN CONTROL AND OF OWNERSHIP LIMIT
 
     LIMITATIONS ON CHANGES IN CONTROL CONTAINED IN THE DECLARATION OF TRUST AND
BYLAWS.  Certain provisions of the Declaration of Trust and the EOP Bylaws may
have the effect of delaying, deferring or preventing a change in control of EOP
or other transaction that could provide the holders of EOP Common Shares with
the opportunity to realize a premium over the then-prevailing market price of
such EOP Common Shares or which might otherwise be in their best interest. The
EOP Ownership Limit (described under "-- Possible Adverse Consequences of
Ownership Limit") also may have the effect of delaying, deferring or preventing
a change in control of EOP or other transactions even if such a change in
control or transaction were in the best interests of some, or a majority, of the
EOP Securityholders. The EOP Board is divided into three classes, with each
class serving a three-year term. The staggered terms of the members of the EOP
Board may adversely affect the shareholders' ability to effect a change in
control of EOP, even if a change in control were in the best interests of some,
or a majority, of the EOP's Securityholders. The Declaration of Trust authorizes
the EOP Board to cause EOP to issue, after giving effect to the Company Merger,
approximately 505 million additional authorized but unissued EOP Common Shares
and an additional 92 million preferred shares of beneficial interest, $.01 par
value per share ("Preferred Shares"), and to reclassify any unissued EOP Common
Shares and to classify any unissued Preferred Shares and reclassify any
previously classified but unissued Preferred Shares of any series, and to
establish the preferences, rights and other terms of any such classified or
unclassified shares. See "SHARES OF BENEFICIAL INTEREST." Prior to the Effective
Time, the EOP Board will adopt resolutions classifying and designating 8,000,000
 
                                       26
<PAGE>   35
 
Preferred Shares as EOP Preferred Shares and will adopt articles supplementary
relating to such EOP Preferred Shares. The EOP Preferred Shares will have
certain provisions that could delay, defer or prevent a change of control of EOP
or other transaction that might involve a premium price for the EOP Common
Shares or otherwise be in the best interests of the EOP Securityholders.
Moreover, although the EOP Board has no such intention at the present time, it
could establish another series of Preferred Shares that could delay, defer or
prevent a change in control of EOP or other transaction that might involve a
premium price for the EOP Common Shares or otherwise be in the best interest of
the EOP Securityholders. The Declaration of Trust and the EOP Bylaws also
contain other provisions that may delay, defer or prevent a change in control of
EOP or other transaction that might involve a premium price for the EOP Common
Shares or otherwise be in the best interest of the EOP Securityholders. See
"CERTAIN PROVISIONS OF MARYLAND LAW AND EOP'S DECLARATION OF TRUST AND BYLAWS."
 
     POSSIBLE LIMITATIONS ON CHANGES IN CONTROL PURSUANT TO MARYLAND LAW.  Under
provisions (which EOP has elected to opt out of, as described below) of the
Maryland General Corporation Law, as amended ("MGCL"), as generally applicable
to real estate investment trusts, certain "business combinations" (including
certain issuances of equity securities) between a Maryland real estate
investment trust and any person who beneficially owns ten percent or more of the
voting power of the trust's then outstanding shares or an affiliate of the trust
who, at any time within the two-year period prior to the date in question, was
the beneficial owner of ten percent or more of the voting power of the then
outstanding voting shares of beneficial interest of the trust (an "Interested
Shareholder"), or an affiliate of the Interested Shareholder, are prohibited for
five years after the most recent date on which the Interested Shareholder
becomes an Interested Shareholder. Thereafter, any such business combination
must be approved by two super-majority shareholder votes unless, among other
conditions, the trust's common shareholders receive a minimum price (as defined
in the MGCL) for their shares and the consideration is received in cash or in
the same form as previously paid by the Interested Shareholder for its common
shares. As permitted by the MGCL, the EOP Board has elected to opt out of the
business combination provisions of the MGCL. Consequently, the five-year
prohibition and the super-majority vote requirements will not apply to a
business combination involving EOP; however, the EOP Board may repeal (except
with respect to a shareholder who becomes an Interested Shareholder as a result
of EOP Common Shares received in the Company Merger) this election and cause EOP
to become subject to these provisions in the future.
 
     POSSIBLE ADVERSE CONSEQUENCES OF OWNERSHIP LIMIT.  For EOP to maintain its
qualification as a REIT for federal income tax purposes, not more than 50% in
value of the outstanding shares of beneficial interest of EOP may be owned,
directly or indirectly, by five or fewer individuals (as defined in the Code, to
include certain entities) at any time during the last half of EOP's taxable
year. See "FEDERAL INCOME TAX CONSIDERATIONS -- Taxation of EOP as a
REIT -- General" and "-- Requirements for Qualification as a REIT." To
facilitate maintenance of its qualification as a REIT for federal income tax
purposes, the Declaration of Trust, subject to certain exceptions, prohibits
ownership, directly or by virtue of the attribution provisions of the Code, by
any single shareholder of more than 9.9% (in value or number of shares,
whichever is more restrictive) of the issued and outstanding shares of any class
or series of shares of beneficial interest of EOP (the "EOP Ownership Limit").
The EOP Board is required to waive or modify the EOP Ownership Limit with
respect to one or more persons who would not be treated as "individuals" for
purposes of the Code if it is satisfied, in its reasonable discretion, based
upon information required to be provided by the party seeking the waiver, that
ownership in excess of this limit will not cause a person who is an individual
to be treated as owning EOP Common Shares or EOP Preferred Shares in excess of
the EOP Ownership Limit, applying the applicable constructive ownership rules,
and will not otherwise jeopardize EOP's status as a REIT for federal income tax
purposes. The EOP Board has granted such an exception for the sole ZML Investor
that is not an "individual" that owned more than 9.9% of the EOP Common Shares
immediately following the Consolidation as a result of receiving such EOP Common
Shares in the Consolidation. Absent any such exemption or waiver, EOP Common
Shares or EOP Preferred Shares acquired or held in violation of the EOP
Ownership Limit will be transferred to a trust for the exclusive benefit of a
designated charitable beneficiary, with the person who acquired such EOP Common
Shares and/or EOP Preferred Shares in violation of the EOP Ownership Limit not
entitled to receive any distributions thereon, to vote such EOP Common Shares or
EOP Preferred Shares, or to receive any proceeds from the subsequent sale
thereof in
 
                                       27
<PAGE>   36
 
excess of the lesser of (i) the price paid by the prohibited owner for the EOP
Common Shares and/or EOP Preferred Shares or, if the prohibited owner did not
give value for the EOP Common Shares and/or EOP Preferred Shares in connection
with the event causing the EOP Common Shares and/or EOP Preferred Shares to be
held in the trust (e.g., in the case of a gift, devise or other such
transaction), the market price of the EOP common and/or EOP Preferred Shares, as
determined pursuant to the Declaration of Trust, on the day the event causing
the EOP Common Shares and/or EOP Preferred Shares to be held in the trust
occurred or (ii) the amount realized from such sale. A transfer of EOP Common
Shares and/or EOP Preferred Shares to a person who, as a result of the transfer,
violates the EOP Ownership Limit may be void under certain circumstances. See
"SHARES OF BENEFICIAL INTEREST -- Restrictions on Ownership and Transfer." The
EOP Ownership Limit may have the effect of delaying, deferring or preventing a
change in control and, therefore, could adversely affect the shareholder's
ability to realize a premium over the then-prevailing market price for the EOP
Common Shares in connection with such transaction which, in turn, could
adversely affect the implied value of the EOP Partnership Units.
 
MANAGED PROPERTY BUSINESS AND NON-REIT SERVICES
 
     CONTRACT TERMINATION.  Risks associated with the management of properties
which are not, and after the Mergers will not be, controlled by EOP Partnership
and properties owned by parties other than EOP Partnership (including affiliates
of the Equity Group Owners) include the risk that management contracts will be
terminated by the entity controlling the property or in connection with a sale
of such property, that contracts may not be renewed upon expiration or may not
be renewed on terms consistent with current terms, and that the rental revenues
upon which management fees are based will decline as a result of general real
estate market conditions or specific market factors resulting in decreased
management fee income. EOP Management Corp. has property management contracts
with respect to the Managed Properties and Beacon Management Company has
management contracts with respect to the properties that it manages, including
the Beacon Joint Venture Properties. There can be no assurance, however, that
these management contracts will not be terminated in the future. The management
contracts with respect to the Managed Properties are terminable by the owners
thereof on 30 or 60 days' notice.
 
     LACK OF CONTROL OVER SERVICE BUSINESS.  To facilitate maintenance of EOP's
qualification as a REIT for federal income tax purposes, management of any
properties that are not wholly owned by EOP Partnership and its subsidiaries is
conducted through EOP Management Corp. and, after the Mergers, will also be
conducted through Beacon Management Company. EOP Partnership owns all of the
non-voting stock (representing a 95% equity interest) and Equity Office
Holdings, L.L.C., a Delaware limited liability company ("EOH"), owns all of the
voting stock (representing a 5% equity interest) of EOP Management Corp. (EOP
does not own any interest in, or otherwise control, EOH.) The current board of
directors of EOP Management Corp. consists of Mr. Zell, together with Arthur
Greenberg and Donald J. Liebentritt, a consultant to and employee of,
respectively, the Equity Group. EOH has the right to elect the directors of EOP
Management Corp. EOP Partnership does not control the timing or amount of
distributions paid by EOP Management Corp., nor does EOP Partnership have the
authority to control the management and operation of EOP Management Corp. As a
result, decisions relating to the declaration and payment of distributions and
the business policies and operations of EOP Management Corp. could be adverse to
the interests of EOP Partnership or could lead to adverse financial results,
which could adversely affect EOP Partnership's financial condition and results
of operations. Also, certain services for EOP Partnership's tenants that may not
be permissibly undertaken by a REIT are conducted through a service corporation
owned entirely by affiliates of the Equity Group Owners. EOP Partnership has no
control over, or ownership interest in, such service corporation, which operates
as an independent contractor. Consequently, EOP Partnership is not able to
assure that the day-to-day operations of the service corporation are conducted
in a manner consistent with EOP Partnership's best interests. EOP Partnership
may, however, terminate the services of the service corporation at any time upon
30 days' notice.
 
                                       28
<PAGE>   37
 
CONFLICTS OF INTEREST IN CONNECTION WITH FORMATION AND BUSINESS OF EOP
 
     ABSENCE OF ARM'S LENGTH NEGOTIATIONS IN THE FORMATION TRANSACTIONS.  There
were no arm's length negotiations in connection with EOP's Formation
Transactions, in particular with respect to the representations and warranties
made by the contributors of properties to EOP Partnership in the Formation
Transactions, or the indemnification provided for breach of such representations
and warranties. Such indemnification is limited generally to an amount equal to
1% of the value of consideration paid by EOP Partnership for such properties and
to $15 million with respect to pre-IPO liabilities in connection with the Equity
Group's contribution of the Management Business. Any losses to EOP Partnership
resulting from breaches of the Contribution Agreement in excess of the foregoing
indemnification limitations would have to be satisfied out of EOP Partnership's
assets, with the potential consequence of decreasing cash available for
distribution to EOP Unitholders. To date, EOP Partnership has no knowledge of
any material breaches of the Contribution Agreement.
 
     INFLUENCE OF TRUSTEES, OFFICERS AND SIGNIFICANT SHAREHOLDERS.  Upon
consummation of the Mergers, Mr. Zell (through the Equity Group and the ZML
Partners) will be deemed to beneficially own approximately 4.0%, Messrs.
Leventhal and Sidman will be deemed to beneficially own approximately 1.4% and
all other trustees and executive officers of EOP will be deemed to beneficially
own approximately 4.0% of the outstanding EOP Common Shares (in each case on a
fully diluted basis, i.e., including EOP Common Shares issuable upon exchange of
EOP Partnership Units). In addition, the ZML Partners may receive distributions
of up to approximately 11.3 million additional EOP Partnership Units
(representing approximately 4.0% of the outstanding EOP Common Shares on a fully
diluted basis) from the ZML Opportunity Partnerships during the two-year period
ending July 11, 1999. All such EOP Partnership Units will be exchangeable for
EOP Common Shares (subject to the Ownership Limit) or, at the option of EOP, for
the cash equivalent of that number of EOP Common Shares, beginning on July 11,
1998 for EOP Partnership Units issued to the Equity Group for the Management
Business and beginning on July 11, 1999 for EOP Partnership Units issued to the
ZML Partners in liquidation of the ZML Opportunity Partnerships. In addition, in
connection with EOP's IPO, Mr. Zell, Ms. Sheli Z. Rosenberg (one of EOP's
trustees) and the Named Executive Officers of EOP received options to purchase
an aggregate of 1,000,000 EOP Common Shares exercisable at the IPO price of $21
per share. Mr. Zell and Ms. Rosenberg are affiliated with the Equity Group
Owners and, along with Messrs. Leventhal and Sidman, as trustees, will have
influence on the management and operation of EOP and, as shareholders, on the
outcome of any matters submitted to a vote of the shareholders. Such influence
might be exercised in a manner that is inconsistent with the interests of other
EOP Securityholders. Although there is no understanding or arrangement for these
trustees, officers and shareholders and their affiliates to act in concert, such
parties would be in a position to exercise significant influence over EOP's
affairs should they choose to do so. If all or a substantial portion of the EOP
Partnership Units were exchanged for EOP Common Shares and such EOP Common
Shares were retained and not sold, subject to the Ownership Limit described
under "-- Limitations on Changes in Control and of Ownership Limit -- Possible
Adverse Consequences of Ownership Limit," the influence of the holders thereof
over the affairs of EOP would increase, and the influence of the remaining EOP
Securityholders would be diminished accordingly.
 
     EOP MANAGEMENT CORP. CONFLICTS.  EOP Management Corp. provides property
management services and, in most cases, asset management services to the EOP
Joint Venture Properties and properties not owned by EOP Partnership but which
are owned or controlled by the Equity Group Owners or their affiliates, and,
after the Mergers, will provide property management services to the Beacon Joint
Venture Properties and properties not owned by Beacon but currently managed by
Beacon Management Company. A substantial majority of these management contracts
were not negotiated on an arm's length basis. Although EOP believes that the
management fees charged by EOP Management Corp. and Beacon Management Company
are at current market rates, there is no assurance that these management fees
will equal at all times those fees that would be charged by an unaffiliated
third party. In this regard, through the Equity Group Owners, Mr. Zell has a
substantial interest in EOH, which owns the voting stock of EOP Management
Corp., and following the Mergers indirectly will control Beacon Management
Company.
 
     CONTINUED INVOLVEMENT IN OTHER INVESTMENT ACTIVITIES.  Although Mr. Zell
entered into a non-competition agreement with EOP at the time of its IPO, the
Equity Group Owners and their affiliates have
 
                                       29
<PAGE>   38
 
and will continue to have a broad and varied range of investment interests, and
companies directly or indirectly involved in real estate investment activities
in which one or more of them has or may acquire an interest will be owners of
real property and will acquire real property in the future. In addition, Mr.
Zell may not have management control over companies in which he or the Equity
Group Owners have or may have an investment interest and, therefore, he may not
be able to control whether any such company engages in activities that are in
competition with activities of EOP. Consequently, Mr. Zell's continued
involvement in other investment activities could result in competition to EOP as
well as management decisions which do not necessarily reflect the interests of
the EOP Securityholders.
 
     In addition, no current officer or director of Beacon will enter into a
non-competition agreement with EOP in connection with the Mergers. Consequently,
after the Mergers, any current officer or director of Beacon could engage in
activities in competition with activities of EOP, except Messrs. Leventhal and
Sidman during their tenure on the EOP Board to the extent that such actions
would violate their fiduciary duties to EOP and the EOP Securityholders.
 
     MONETARY LOSS TO COMPANY UPON FAILURE TO ENFORCE TERMS OF
CONTRIBUTIONS.  Through the Equity Group Owners, Mr. Zell has a substantial
economic interest in the Equity Group and controls and has a substantial
economic interest in the ZML Partners. Consequently, Mr. Zell has a conflict of
interest with respect to his obligation as an officer and trustee of EOP to
enforce the terms of the Contribution Agreement. The failure to enforce the
material terms of the Contribution Agreement, particularly the indemnification
provisions and the remedy provisions for breaches of representations and
warranties, could result in a monetary loss to EOP.
 
     CONFLICTS OF INTEREST IN CONNECTION WITH PROPERTIES OWNED OR CONTROLLED BY
THE EQUITY GROUP OWNERS OR THEIR AFFILIATES.  The Equity Group Owners or their
affiliates control or share control and have substantial economic interest in
the Managed Properties which were not contributed to EOP Partnership at the time
of its IPO. Beacon affiliates have interests in one of the three Beacon Managed
Properties which will not be acquired by EOP Partnership in the Mergers. EOP
Partnership believes that these Managed Properties generally do not directly
compete with any of the Properties; however, it is possible that a Managed
Property may compete with EOP Partnership in the future if EOP Partnership were
to invest in an office property similar to and in close proximity to such
property. Such competition could result in conflicting demands on management and
loss of income to EOP Partnership, consequently reducing distributions to EOP
Unitholders. EOP is prohibited by the terms of the EOP Bylaws from acquiring any
properties from the Equity Group Owners or their affiliates without the approval
of a majority of its disinterested trustees. See "EOP PARTNERSHIP POLICIES WITH
RESPECT TO CERTAIN ACTIVITIES -- Conflict of Interest Policies."
 
     CONFLICTS OF INTEREST IN CONNECTION WITH LEASE AGREEMENT WITH AN AFFILIATE
OF EQUITY GROUP OWNERS. EOP Partnership leases office space from an entity
controlled by an affiliate of the Equity Group Owners, at Two North Riverside
Plaza, Chicago, Illinois. EOP Partnership believes that the rental rates and
other terms of such lease are on current market terms.
 
POSSIBLE ENVIRONMENTAL LIABILITIES
 
     GENERAL.  Under federal, state and local laws and regulations relating to
protection of the environment ("Environmental Laws"), a current or previous
owner or operator of real estate may be required to investigate and clean up
hazardous or toxic substances or petroleum product releases at such property and
may be held liable to a governmental entity or to third parties for property
damage and for investigation and clean-up costs incurred by such parties in
connection with the contamination. Such laws typically impose clean-up
responsibility and liability without regard to whether the owner or operator
knew of or caused the presence of the contaminants, and the liability under such
laws has been interpreted to be joint and several unless the harm is divisible
and there is a reasonable basis for allocation of responsibility. In addition,
the owner or operator of a site may be subject to claims by third parties based
on damages and costs resulting from environmental contamination emanating from a
site.
 
                                       30
<PAGE>   39
 
     Environmental Laws also govern the presence, maintenance and removal of
asbestos-containing building materials ("ACBMs"). Such laws require that ACBMs
be properly managed and maintained, that those who may come into contact with
ACBMs be adequately apprised or trained and that special precautions, including
removal or other abatement, be undertaken in the event ACBMs would be disturbed
during renovation or demolition of a building. Such laws may impose fines and
penalties on building owners or operators for failure to comply with these
requirements and may allow third parties to seek recovery from owners or
operators for personal injury associated with exposure to asbestos fibers.
 
     EOP.  In connection with EOP's IPO, independent environmental consultants
conducted or updated comprehensive environmental assessments at the EOP
Properties then owned and have conducted or updated such assessments at all EOP
Properties acquired since the IPO. These assessments included, at a minimum, a
visual inspection of the EOP Properties and the surrounding areas, an
examination of current and historical uses of the EOP Properties and the
surrounding areas and a review of relevant state, federal and historical
documents. Where appropriate, on a property by property basis, additional
testing has been conducted, including sampling for asbestos, for lead in
drinking water, for soil contamination where underground storage tanks are or
were located or where other past site usages create a potential for site impact,
and for contamination in groundwater.
 
     These environmental assessments have not revealed any environmental
liabilities at the EOP Properties that EOP believes would have a material
adverse effect on EOP's business, assets, financial condition or results of
operations taken as a whole, nor is EOP aware of any such material environmental
liability. ACBMs have been detected through sampling in approximately half of
the EOP Office Properties. Most of these buildings contain only minor amounts of
ACBMs in good condition and nearly all of it is non-friable. All ACBMs are
currently being properly managed and maintained and other requirements relating
to ACBMs are being followed. The presence of ACBMs should not present a
significant risk as long as compliance with these requirements continues. For a
few of the EOP Properties, potential offsite sources of contamination, such as
underground storage tanks ("USTs"), are noted. For some of the EOP Properties,
previous uses, such as the former presence of USTs, have been noted; in these
cases, follow-up soil and/or groundwater sampling has not identified evidence of
significant contamination.
 
     EOP believes that the EOP Properties are in compliance in all material
respects with applicable Environmental Laws. EOP believes that the issues
identified in its environmental reports will not have a material adverse effect
on EOP if it continues to comply with Environmental Laws and with the
recommendations set forth in these reports. No assurance can be given, however,
that unidentified environmental liabilities will not arise with respect to the
EOP Properties which could have an adverse effect on EOP's financial condition.
 
     BEACON.  Phase I environmental site assessments have been conducted at all
of the Beacon Properties by independent environmental consultants. These
assessments have included, at a minimum, a visual inspection of the Beacon
Properties and the surrounding areas, an examination of current and historical
uses of the Beacon Properties and the surrounding areas and a review of relevant
state, federal and historical documents. Where appropriate, on a property by
property basis, additional testing has been conducted, including sampling for
asbestos, for lead in drinking water, for soil contamination where underground
storage tanks are or were located or where other past site usages create a
potential for site impact, and for contamination in groundwater.
 
     Beacon believes that the Beacon Properties are in compliance in all
material respects with applicable Environmental Laws. Beacon believes that the
issues identified in its environmental reports would not (assuming that the
Mergers are not completed) have a material adverse effect on Beacon if it
continues to comply with Environmental Laws and with the recommendations set
forth in these reports. Beacon has not been notified by any governmental
authority, and has no other knowledge of, any material non-compliance, liability
or claim relating to hazardous or toxic substances or other environmental
substances in connection with any Beacon Property, except as previously
disclosed in documents incorporated herein by reference. No assurance can be
given, however, that unidentified environmental liabilities will not arise with
respect to the
 
                                       31
<PAGE>   40
 
Beacon Properties which could have an adverse effect on Beacon's financial
condition prior to the Mergers or on EOP's financial condition after the
Mergers.
 
OWNERSHIP OF EOP COMMON SHARES
 
     EFFECT ON EOP COMMON SHARE PRICE OF SHARES AVAILABLE FOR FUTURE
SALE.  Sales of a substantial number of Restricted EOP Common Shares, or the
perception that such sales could occur, could adversely affect prevailing market
prices of the EOP Common Shares. A substantial portion of EOP's outstanding
equity is Restricted EOP Common Shares or EOP Partnership Units which may be
converted into Restricted EOP Common Shares. EOP Common Shares issued upon
redemption of EOP Partnership Units (including EOP Partnership Units to be
issued in the Partnership Merger) may be sold in the public market pursuant to
registration rights (subject to the terms and conditions thereof) that EOP
granted to certain ZML Investors, the ZML Partners and the Equity Group or that
Beacon granted to certain Beacon Unitholders, or pursuant to Rule 144 under the
Securities Act or other available exemptions from registration. In addition, EOP
has reserved a number of EOP Common Shares for issuance pursuant to EOP's
employee benefit plans and such EOP Common Shares will be available for sale
from time to time. Options to purchase additional EOP Common Shares have been
granted to certain executive officers, employees, trustees and consultants. In
addition, all of the EOP Common Shares to be issued in connection with the
Company Merger to the Beacon Shareholders, other than affiliates of Beacon, will
be freely tradeable. (The EOP Common Shares to be issued in the Company Merger
to affiliates of Beacon will be tradeable within the volume and manner of sale
limitations of Rule 144 under the Securities Act.) No prediction can be made
about the effect that future sales of EOP Common Shares, or the perception that
such sales could occur, will have on the market prices of the EOP Common Shares.
 
     EFFECT ON EOP COMMON SHARE PRICE OF MARKET CONDITIONS.  As with other
publicly traded equity securities, the value of the EOP Common Shares depends
upon various market conditions, which may change from time to time. Among the
market conditions that may affect the value of the EOP Common Shares and,
therefore, the EOP Partnership Units are the following: the extent of
institutional investor interest in EOP; the reputation of REITs and office REITs
generally and the attractiveness of their equity securities in comparison to
other equity securities (including securities issued by other real estate-based
companies); EOP's financial performance; and general stock and bond market
conditions.
 
     EFFECT ON EOP COMMON SHARE PRICE OF EARNINGS AND CASH DISTRIBUTIONS.  It is
generally believed that the market value of the equity securities of a REIT is
based primarily upon the market's perception of the REIT's growth potential and
its current and potential future cash distributions, whether from operations,
sales or refinancings, and is secondarily based upon the real estate market
value of the underlying assets. For that reason, EOP Common Shares may trade at
prices that are higher or lower than the net asset value per EOP Common Share.
To the extent EOP retains operating cash flow for investment purposes, working
capital reserves or other purposes, these retained funds, while increasing the
value of EOP's underlying assets, may not correspondingly increase the market
price of the EOP Common Shares. The failure of EOP to meet the market's
expectation with regard to future earnings and cash distributions likely would
adversely affect the market price of the EOP Common Shares and, therefore, the
value of the EOP Partnership Units. If the market price of the EOP Common Shares
declined significantly, EOP might breach certain covenants with respect to
future debt obligations which breach might adversely affect EOP's liquidity and
EOP's ability to make future acquisitions.
 
     EFFECT ON EOP COMMON SHARE PRICE OF MARKET INTEREST RATES.  One of the
factors that influences the price of the EOP Common Shares is the distribution
rate on the EOP Common Shares (as a percentage of the price of the EOP Common
Shares) relative to market interest rates. Thus, an increase in market interest
rates may lead prospective purchasers of EOP Common Shares to expect a higher
distribution rate, which would adversely affect the market price of the EOP
Common Shares and, therefore, the value of the EOP Partnership Units.
 
     DEPENDENCE ON EXTERNAL SOURCES OF CAPITAL.  In order to qualify as a REIT
under the Code, EOP generally is required to distribute to its shareholders each
year at least 95% of its net taxable income
 
                                       32
<PAGE>   41
 
(excluding any net capital gain). See "FEDERAL INCOME TAX
CONSIDERATIONS -- Requirements for Qualification as a REIT -- Annual
Distribution Requirements Applicable to REITs." In part, because of these
distribution requirements, it is unlikely that EOP will be able to fund all
future capital needs, including capital needs in connection with acquisitions,
from cash retained from operations. As a result, to fund future capital needs,
EOP likely will have to rely on third-party sources of capital, which may or may
not be available on favorable terms or at all. EOP's access to third-party
sources of capital will depend upon a number of factors, including the market's
perception of EOP's growth potential and its current and potential future
earnings and cash distributions and the market price of the EOP Common Shares.
Moreover, additional equity offerings may result in substantial dilution of
shareholders' interests in EOP and limited partners' interest in EOP
Partnership, and additional debt financing may substantially increase EOP
Partnership's leverage. See "EOP PARTNERSHIP POLICIES WITH RESPECT TO CERTAIN
ACTIVITIES -- Financing Policies."
 
DEPENDENCE ON KEY PERSONNEL
 
     EOP Partnership is dependent on the efforts of EOP's executive officers,
particularly Messrs. Zell and Callahan. The loss of their services could have an
adverse effect on the operations of EOP Partnership. Neither of these officers
has an employment agreement with EOP.
 
CONTINGENT OR UNDISCLOSED LIABILITIES
 
     In EOP's Formation Transactions, pursuant to the Contribution Agreement,
EOP Partnership acquired all the assets of the ZML Opportunity Partnerships and
certain assets of the Equity Group subject to existing liabilities. Such
liabilities became the obligations of EOP Partnership because EOP Partnership
acquired the assets, subject to the liabilities, of the ZML Opportunity
Partnerships, each of which will liquidate over the two-year period ending July
11, 1999, and the EOP Partnership Units and other assets (including cash from
distributions), net of liabilities, will be distributed to the ZML Partners and
the limited partners of the ZML Opportunity Partnerships (EOP and one other
Person) during such time period. EOP Partnership's recourse against the Equity
Group with respect to liabilities in connection with the Management Business
existing at the time of the Formation Transactions is limited to $15 million,
and EOP Partnership's recourse with respect to any unknown liabilities in
connection with the contribution of EOP Properties in the Formation Transactions
is limited to 1% of the value of the consideration paid for those assets and
must be asserted prior to July 11, 1999. Unknown liabilities might include
liabilities for cleanup or remediation of undisclosed environmental conditions,
claims of tenants, vendors or other persons dealing with the entities prior to
EOP's IPO (that had not been asserted prior to the IPO), accrued but unpaid
liabilities incurred in the ordinary course of business, and claims for
indemnification by ZML Partners of the ZML Opportunity Partnerships, the Equity
Group, its directors and officers, and others indemnified by such entities. See
"-- Possible Environmental Liabilities" above as to the possibility of
undisclosed environmental conditions. Similarly, EOP Partnership succeeded to
any liabilities that the ZML REITs may have had for periods prior to EOP's IPO
and to any liabilities, including claims for property transfer taxes, arising
out of the contribution to EOP Partnership of the EOP Properties in the
Formation Transactions.
 
                                       33
<PAGE>   42
 
                     THE BEACON PARTNERSHIP SPECIAL MEETING
 
GENERAL
 
     This Proxy Statement/Prospectus is being furnished to the holders of record
of Beacon Partnership Units as of the Record Date and is accompanied by a form
of proxy, which is being solicited by Beacon as general partner of the Beacon
Partnership for use at the Beacon Partnership Special Meeting to be held on
Friday, December 19, 1997, at 9:30 a.m., Boston time, at State Street Bank, 225
Franklin Street, Boston, Massachusetts, and any adjournments thereof. At the
Beacon Partnership Special Meeting, holders of record of Beacon Partnership
Units will consider and vote upon proposals to approve (i) the Partnership
Merger and the Agreement and (ii) the transfer by Beacon of its Beacon
Partnership Units to EOP and the withdrawal of Beacon as general partner of
Beacon Partnership which will occur as a result of the Company Merger. See "THE
MERGERS." The Partnership Merger will be approved if it receives the affirmative
vote of holders of 85% of the outstanding Beacon Partnership Units (including
such Beacon Partnership Units held by Beacon). Beacon owns approximately 90% of
the Beacon Partnership Units and intends to vote in favor of the Partnership
Merger. The transfer to EOP of the Beacon Partnership Units held by Beacon and
its withdrawal as general partner of Beacon Partnership pursuant to the Company
Merger will be approved if it receives the affirmative vote of holders of a
majority of the outstanding Beacon Partnership Units (excluding such Beacon
Partnership Units held by Beacon). Proxies may be voted on such other matters as
may properly come before the Beacon Special Meeting, or any adjournments
thereof, in the best judgment of the proxy holders named therein.
 
     EACH BEACON UNITHOLDER IS REQUESTED TO COMPLETE, DATE AND SIGN THE
ACCOMPANYING PROXY AND RETURN IT PROMPTLY TO BEACON IN THE ENCLOSED,
POSTAGE-PAID ENVELOPE OR BY FACSIMILE. FAILURE TO RETURN YOUR PROPERLY EXECUTED
PROXY OR TO VOTE AT THE MEETING WILL HAVE THE SAME EFFECT AS A VOTE AGAINST THE
MERGERS AND THE AGREEMENT.
 
VOTING AND REVOCATION OF PROXIES
 
     All Beacon Partnership Units represented by duly executed proxies will,
unless such proxies have been previously revoked, be voted in accordance with
the instructions indicated in such proxies. IF NO INSTRUCTIONS ARE INDICATED,
SUCH BEACON PARTNERSHIP UNITS WILL BE VOTED FOR APPROVAL OF THE MERGERS AND THE
AGREEMENT. A Beacon Unitholder who has executed and delivered a proxy may revoke
it at any time before it is voted by giving written notice of revocation or
submitting a signed proxy bearing a later date to the Secretary of Beacon
(provided such notice or proxy is actually received by Beacon prior to the vote
of the Beacon Unitholders), or by voting in person at the Beacon Partnership
Special Meeting; however, mere attendance at the Beacon Partnership Special
Meeting will not in and of itself have the effect of revoking the proxy. Beacon
Unitholders may vote via facsimile by calling (800) 223-2064 for instructions. A
proxy will not be revoked by the death or incapacity of the unitholder executing
it unless, before the units are voted, notice of such death or supervening
incapacity is filed with the Secretary of Beacon or other person authorized to
tabulate the votes on behalf of Beacon Partnership.
 
SOLICITATION OF PROXIES
 
     Beacon Partnership will bear the costs of soliciting proxies from the
Beacon Unitholders. In addition to use of the mails, proxies may be solicited
personally or by telephone or facsimile by directors, officers and regular
employees of Beacon, who will not be specially compensated for such solicitation
activities. Arrangements also will be made with nominees and fiduciaries for the
forwarding of solicitation materials to the beneficial owners of Beacon
Partnership Units held of record by such persons, and such persons will be
reimbursed for their reasonable expenses incurred in that effort by Beacon
Partnership. Georgeson & Co. Inc. has been engaged by Beacon Partnership to act
as proxy solicitors in connection with the Mergers and will receive a fee of
$10,000, plus expenses.
 
                                       34
<PAGE>   43
 
VOTE REQUIRED
 
     To be approved, the Partnership Merger must be approved by the affirmative
vote of holders of 85% of the outstanding Beacon Partnership Units (including
such Beacon Partnership Units held by Beacon). Beacon owns approximately 90% of
the Beacon Partnership Units and intends to vote in favor of the Partnership
Merger. To be approved, the transfer to EOP of the Beacon Partnership Units held
by Beacon and the withdrawal of Beacon as general partner of Beacon Partnership
must receive the affirmative vote of holders of at least a majority of the
outstanding Beacon Partnership Units (excluding such Beacon Partnership Units
held by Beacon). Abstentions will have the effect of votes against the approval
of the Mergers and the Agreement.
 
     Beacon has fixed the close of business on November 14, 1997, as the record
date (the "Record Date") for determining Beacon Unitholders entitled to notice
of and to vote at the Beacon Partnership Special Meeting. Only holders of Beacon
Partnership Units at the close of business on the Record Date who have been
admitted as partners will be entitled to notice of and to vote at the Beacon
Partnership Special Meeting. As of the Record Date, there were 6,398,900 Beacon
Partnership Units outstanding, excluding Beacon Partnership Units held by
Beacon. Beacon Unitholders are entitled to one vote per Beacon Partnership Unit.
As of the Record Date, the members of the Beacon Board and the executive
officers of Beacon and their affiliates are deemed to beneficially own a total
of 2,778,981 Beacon Partnership Units, representing approximately 37% of the
outstanding Beacon Partnership Units, excluding Beacon Partnership Units held by
Beacon, all of which are expected to be voted in favor of the Mergers and the
Agreement. Moreover, in connection with the Agreement, certain of these
directors, officers and affiliates entered into the Beacon Voting Agreement
pursuant to which such individuals and entities, which collectively hold
approximately 2,571,618 Beacon Partnership Units or approximately 35% of the
outstanding Beacon Partnership Units not held by Beacon, have agreed, among
other things, to vote their Beacon Partnership Units to approve the Agreement,
the Partnership Merger, the transfer of Beacon Partnership Units held by Beacon
and its withdrawal as general partner of Beacon Partnership and any other matter
which requires their vote in connection with the transactions contemplated by
the Agreement.
 
RECOMMENDATION
 
     For the reasons described herein, the Beacon Board, on behalf of Beacon, in
its capacity as general partner of Beacon Partnership, unanimously approved the
Mergers and the Agreement. THE BEACON BOARD BELIEVES THE MERGERS ARE FAIR TO,
AND IN THE BEST INTERESTS OF, BEACON, BEACON PARTNERSHIP AND THEIR RESPECTIVE
SECURITYHOLDERS AND UNANIMOUSLY RECOMMENDS THAT THE BEACON UNITHOLDERS VOTE FOR
APPROVAL OF THE PARTNERSHIP MERGER, THE AGREEMENT AND THE TRANSACTIONS
CONTEMPLATED THEREBY AND THE TRANSFER OF BEACON PARTNERSHIP UNITS HELD BY BEACON
AND ITS WITHDRAWAL AS GENERAL PARTNER OF BEACON PARTNERSHIP.
 
OTHER MATTERS
 
     At the present time, it is not anticipated that any other matters will be
brought before the Beacon Partnership Special Meeting for consideration and vote
by the Beacon Unitholders, including, without limitation, any motion to adjourn
such meeting. In the event of any vote to adjourn the Beacon Partnership Special
Meeting in order to allow Beacon to solicit votes in favor of the Mergers and
the Agreement, proxies voting AGAINST the Partnership Merger and the Agreement
will be voted against the motion to adjourn the Beacon Partnership Special
Meeting.
 
                                  THE MERGERS
 
     The detailed terms of the Mergers are contained in the Agreement attached
as Annex I to this Proxy Statement/Prospectus. The following discussion
describes the more important aspects of the Mergers and the terms of the
Agreement. This description is qualified in its entirety by reference to the
Agreement, which is incorporated by reference herein and which Beacon
Unitholders are urged to read carefully.
 
                                       35
<PAGE>   44
 
BACKGROUND OF AND REASONS FOR THE MERGERS
 
     BACKGROUND OF THE MERGERS.  The prospectus dated July 7, 1997, relating to
EOP's IPO described EOP's growth strategies. With respect to EOP's external
growth strategy, the prospectus stated that EOP "is pursuing, and expects to
continue to actively pursue, acquisitions of additional office properties . . .,
although no such acquisitions are currently probable. Management believes that
significant opportunities for external growth will continue to be available
through strategic acquisitions of institutional quality office properties . . .
 . Properties may be acquired separately or as part of a portfolio, and may be
acquired for cash and/or in exchange for equity or debt securities of [EOP], and
such acquisitions may be customary real estate transactions and/or mergers or
other business combinations."
 
     The prospectus also stated EOP's view that "[t]he real estate industry is
in the early stages of a major consolidation which [EOP] believes will continue
as institutional owners gain increasing confidence in indirect rather than
direct ownership of real estate . . . . [EOP] believes that given its size, its
UPREIT structure (which enables it to acquire properties in transactions that
may permit sellers to defer tax consequences) and its historic relationship with
many of the major institutional owners of real estate in the United States, it
will be well positioned to benefit from the consolidation that is occurring in
the real estate industry."
 
     On August 2, 1997, Samuel Zell, Chairman of the EOP Board, and Alan
Leventhal, President, Chief Executive Officer and a member of the Beacon Board,
independently attended a social event. At that event, Mr. Zell suggested to Mr.
Leventhal that a strategic merger of EOP and Beacon should be explored. Messrs.
Zell and Leventhal then briefly discussed in general terms the possibility of a
business combination transaction between Beacon and EOP and the strategic
benefits that could be achieved by such a transaction. Following this
conversation, both executives agreed to consider further the possible advantages
of such a strategic merger and to contact each other again if they were
interested in pursuing such a transaction. Following August 15, 1997, after
returning from a trip abroad, Mr. Zell contacted Mr. Leventhal to indicate his
continued interest and suggested that the parties proceed with more substantive
discussions regarding a potential transaction.
 
     As a result of these conversations, each of EOP and Beacon began to analyze
a potential strategic merger of EOP and Beacon, focusing particularly on the
geographic and operational fit of the two companies, the quality of the assets
of the other company, the magnitude of and certainty of achieving, cost savings
from a combination, the capital structures and relative costs of capital of the
companies, and the strength of the other company's management team.
 
     On August 26, 1997, Tim Callahan, President of EOP, met with Alan Leventhal
and Lionel Fortin, Executive Vice President and Chief Operating Officer of
Beacon, in order to explore the feasibility of a strategic merger in greater
depth. At this meeting, the participants discussed in general terms their
respective businesses and business organizations, their existing markets and the
strategic goals of both companies. The parties also considered, in general
terms, the manner in which the combined companies might operate and what
benefits to the EOP Shareholders and the Beacon Shareholders would result
therefrom. At the end of this meeting, the parties concluded that the potential
benefits from a strategic merger warranted the continuation of discussions
regarding the matter.
 
     Following the August 26 meeting, the parties commenced negotiating the
terms and provisions of reciprocal confidentiality agreements, which provided
that each party would not disclose and would keep confidential all non-public
due diligence materials provided to it by the other party. The parties executed
these confidentiality agreements on September 5, 1997. Also on that date, Alan
Leventhal, Lionel Fortin and Robert Perriello (Senior Vice President and Chief
Financial Officer of Beacon) met with Tim Callahan, Richard Kincaid (Executive
Vice President and Chief Financial Officer of EOP) and Jeffrey Johnson (Senior
Vice President -- Investments of EOP) to continue discussions regarding a
possible strategic merger. At this meeting, the participants exchanged a variety
of information relating to both companies' current businesses, future potential
acquisitions and short-term and long-term business objectives.
 
     Over the weekend of September 6, 1997 and September 7, 1997, Lionel Fortin
and Tim Callahan engaged in several phone conversations in which they discussed
the material terms of a possible business
 
                                       36
<PAGE>   45
 
combination, including (i) the relative exchange ratio and whether it would be
fixed or vary depending on the trading price of EOP Common Shares, (ii) whether
Beacon should have a right to terminate the transaction in the event of a
significant decrease in the trading price of EOP Common Shares and, if so, the
price level that would trigger such right, (iii) whether to provide for break-up
fees payable by either Beacon or EOP if the transaction were to be terminated
for certain specified reasons and, if so, the amounts of such fees and
triggering events, (iv) the representation of Beacon on the EOP Board, (v) the
nature of mechanisms to permit certain Beacon Unitholders to defer the
recognition of gain if certain properties were sold or certain outstanding loans
repaid, and (vi) the treatment of outstanding employee stock options. The
parties, however, did not reach agreement on the material terms of a possible
business combination at this time.
 
     On September 8, 1997, Samuel Zell contacted Alan Leventhal and both parties
reiterated their interest in pursuing a possible strategic merger. At Mr. Zell's
suggestion, Alan Leventhal, Lionel Fortin, Samuel Zell and Tim Callahan met on
September 10, 1997 in Boston and continued substantive discussions regarding the
terms of a possible strategic merger. At this meeting, the parties agreed upon
the general structure of the Mergers and certain material terms. During the week
of September 8, 1997, Mr. Leventhal had numerous discussions with the members of
the Beacon Board to review the possible strategic merger.
 
     On September 11, 1997, Beacon hired Morgan Stanley to act as Beacon's
financial advisor in connection with the proposed merger of Beacon and EOP.
Morgan Stanley's responsibilities included advice and assistance with respect to
defining objectives, performing valuation analysis, and structuring, planning
and negotiating the transaction. In addition, Morgan Stanley agreed to render a
fairness opinion letter with respect to the fairness, from a financial point of
view, of the consideration to be received by the Beacon Shareholders in the
transaction.
 
     On September 11, 1997, the parties and their attorneys and accountants
commenced preparation and negotiation of definitive documentation for the
proposed business combination transaction. Representatives of EOP and its
attorneys and financial advisors traveled to Boston to commence their respective
due diligence reviews of Beacon and its operations. At this point, a number of
material terms were not resolved, including the trading price of EOP Common
Shares that would trigger Beacon's termination rights, the precise nature of
termination rights and break-up fees and the treatment of outstanding employee
stock options. However, the parties believed that negotiations had proceeded to
a point where the remaining differences should be addressed in the context of
negotiations over definitive documentation.
 
     On September 13, 1997, EOP hired J.P. Morgan to act as EOP's financial
advisor with respect to the delivery of a written opinion to the EOP Board as to
the fairness, from a financial point of view, to EOP of the consideration
proposed to be paid by it in connection with the proposed merger of EOP and
Beacon. On September 13, 1997, EOP also hired Merrill Lynch to act as financial
advisor to EOP in connection with a possible acquisition transaction involving
Beacon. Merrill Lynch's responsibilities included analyzing, negotiating and
advising EOP with respect to such an acquisition transaction.
 
     On September 13, 1997, the compensation committee of the Beacon Board met
to review the various compensation and severance issues relating to the possible
strategic merger. Additionally, on September 14, 1997, a proposed form of merger
agreement was forwarded by EOP's management and legal counsel and Beacon's
management and legal counsel to the EOP Board and the Beacon Board,
respectively, for their consideration.
 
     On the evening of September 14, 1997, a special meeting of the EOP Board
was held at which members of management and representatives of J.P. Morgan and
Merrill Lynch and EOP's legal advisors were present in person or by conference
telephone call. The special meeting was held in order for the EOP Board to
consider and formally act upon the proposed strategic merger. At this meeting,
Messrs. Zell, Callahan and Kincaid described to the EOP Board the background and
events leading up to the meeting with respect to the proposed merger. Messrs.
Zell, Callahan and Kincaid then set forth the reasons they believed a strategic
merger with Beacon would be beneficial to EOP and its shareholders, including
(i) Beacon's high quality properties, the nature of Beacon's operations and
Beacon's commitment to tenant satisfaction (each of which are comparable to
those of EOP), (ii) management's belief that the proposed merger would result in
significant operating efficiencies, greater access to capital and reduced cost
of capital, (iii) management's
 
                                       37
<PAGE>   46
 
belief that the combination of Beacon's properties with those of EOP would
solidify EOP's leadership position in the office properties industry and
significantly enhance EOP's operations in attractive office markets such as
metropolitan Boston, Chicago, Washington, D.C., Atlanta, Los Angeles and San
Francisco, and (iv) management's belief that a merger would most likely increase
Funds from Operations per EOP Common Share and per EOP Partnership Unit
available for distribution in future periods. Legal counsel then reviewed the
fiduciary duties of trustees in connection with consideration of a merger
proposal and described to the EOP Board the due diligence investigation of
Beacon which had been conducted. J.P. Morgan then made a presentation which
included, among other things, (i) a summary of key transaction terms and a
description of the Mergers, (ii) an analysis of the stock trading history of
each of EOP and Beacon, (iii) valuation analyses of EOP and Beacon, (iv) a
comparison of each of EOP and Beacon with selected publicly traded companies,
(v) a comparison of the proposed terms of the Mergers with the financial terms
of other relevant mergers and acquisitions, and (vi) a pro forma merger
analysis. J.P. Morgan delivered to the EOP Board its oral opinion that, as of
that date, based upon the facts and circumstances as they existed at that time,
and subject to certain assumptions, limitations and other matters identified to
the EOP Board, the Merger Consideration to be paid by EOP in connection with the
proposed Mergers are fair, from a financial point of view, to EOP, including EOP
Partnership.
 
     EOP's legal counsel then made a presentation to the EOP Board in which it
explained the material terms of the form of Agreement and the transactions
contemplated thereby, including closing conditions, termination rights and
provisions regarding break-up fees and termination expenses, and briefed the EOP
Board on certain legal issues raised by the proposed merger. In addition, legal
counsel reviewed a proposed timetable for completing the transaction.
 
     Following such presentation, and after extensive discussion of the
advantages and risks of the proposed Merger transaction described under
"-- EOP's Reasons for the Mergers; Recommendation of the EOP Board" and
"-- Opinions of Financial Advisors -- EOP," the EOP Board concluded that the
advantages of the Mergers outweighed the potential risks, and unanimously
approved the Mergers, the form of Agreement and all transactions contemplated
thereby.
 
     On the evening of September 14, 1997, the Beacon Board met to consider the
proposed transaction with EOP. At this meeting, Beacon's senior management,
together with Beacon's legal and financial advisors and legal counsel to
Beacon's independent directors, reviewed with the Beacon Board the current
operations and properties of EOP, the background of the proposed business
combination, and certain financial and valuation analyses of the transaction,
and certain severance and other payments to be made in connection with the
Merger. Beacon's senior management also discussed with the Beacon Board the
strategic rationale for the transaction and the potential benefits and potential
negative consequences of the proposed transaction for Beacon and Beacon
Partnership and their respective securityholders. For a discussion of these
factors, see "-- Beacon Reasons for the Mergers; Recommendation of the Beacon
Board" and "-- Interests of Certain Persons in the Mergers" below. Beacon's
legal counsel also discussed with the Beacon Board, among other things, the
terms of the legal documentation relating to the proposed transaction, the
timetable for signing such definitive documentation and its fiduciary duties to
its shareholders as well as the unitholders of Beacon Partnership. Morgan
Stanley then made a presentation which included, among other things (i) a
summary of key transaction terms and a description of the Mergers, (ii) a
comparison of each of EOP and Beacon with selected publicly traded companies,
(iii) an analysis of the stock trading history of EOP and Beacon, (iv) valuation
analyses of EOP and Beacon, (v) a comparison of the proposed terms of the
Mergers with the financial terms of other relevant mergers and acquisitions, and
(vi) a pro forma merger analysis. Morgan Stanley also rendered its oral fairness
opinion to the Beacon Board that, as of such date, based upon the facts and
circumstances as they existed at the time, and subject to certain assumptions,
factors and limitations, the proposed Exchange Ratio was fair, from a financial
point of view, to the Beacon Shareholders. Following these presentations, the
directors asked numerous questions of management and its legal and financial
advisors and discussed at length the issues raised by these presentations,
including the Morgan Stanley presentation and fairness opinion. At the
conclusion of these discussions, the Beacon Board unanimously approved the
merger proposals and the transactions related thereto on substantially the terms
discussed at the meeting, and authorized management to complete negotiations of,
and execute, the Agreement.
 
                                       38
<PAGE>   47
 
     Throughout the night of September 14, 1997, representatives of Beacon and
EOP and their respective legal counsel negotiated the remaining unresolved terms
of the Agreement. On the morning of September 15, 1997, Beacon, Beacon
Partnership, EOP and EOP Partnership executed the definitive Agreement and
related documents.
 
     BEACON'S REASONS FOR THE MERGERS; RECOMMENDATION OF THE BEACON BOARD.  The
Beacon Board, on behalf of Beacon, in its capacity as general partner of Beacon
Partnership, unanimously approved the Mergers and the Agreement at a meeting
held on September 14, 1997. The Beacon Board believes that the terms of the
Mergers, the Agreement and the other transactions contemplated thereby are fair
to, and in the best interests of, Beacon, Beacon Partnership and their
respective securityholders. Accordingly, the Beacon Board unanimously approved
the Mergers, the Agreement and the transactions contemplated thereby and
recommends approval of the Mergers, the Agreement and the transactions
contemplated thereby and the transfer of Beacon Partnership Units held by Beacon
and its withdrawal as general partner of Beacon Partnership by the Beacon
Unitholders.
 
     In reaching the determination that the Mergers and the related transactions
are fair to, and in the best interests of, Beacon, Beacon Partnership and their
respective securityholders, the Beacon Board consulted with Beacon management,
as well as its financial advisors, legal counsel and accountants and considered
the short-term and long-term interests of Beacon, Beacon Partnership and their
respective securityholders. In particular, the Beacon Board considered the
following material factors, all of which it deemed favorable:
 
          (i) Value of Consideration to Be Received by Beacon Unitholders in the
     Partnership Merger as Compared to Historical and Recent Market Prices of
     Beacon Common Shares.  Each EOP Partnership Unit to be received by Beacon
     Unitholders in the Partnership Merger will be redeemable for one EOP Common
     Share or at EOP's option, the cash equivalent thereof. The value of one EOP
     Partnership Unit is therefore equivalent to the value of one EOP Common
     Share. Consequently, based on the Exchange Ratio and the closing price of
     EOP Common Shares on September 12, 1997 (the last trading day prior to the
     public announcement of the Merger), Beacon Unitholders would receive EOP
     Partnership Units in the Partnership Merger having a value of $47.02,
     representing a 28.4% premium over the closing price of $36.63 for Beacon
     Common Shares on September 12, 1997 and a 27.1% premium over $37.00, the
     highest closing price for Beacon Common Shares over the 52-week period
     preceding the public announcement of the Mergers.
 
          (ii) Benefits from Being the Largest Office REIT in the Nation.  The
     Partnership Merger provides an opportunity for Beacon Unitholders to become
     limited partners in EOP Partnership, the operating partnership of EOP, the
     largest publicly owned owner and operator of office properties in the
     nation, with one of the strongest management teams in the industry. As of
     September 14, 1997, the Merger would result in the surviving company owning
     approximately 250 properties containing approximately 65 million square
     feet as compared to Beacon's existing and anticipated portfolio of 126
     properties containing approximately 20.7 million square feet. In addition,
     the combined asset portfolio will be more geographically diversified than
     Beacon's current portfolio, with properties located in 20 states and the
     District of Columbia compared to Beacon's existing properties which are
     located in only five states. By virtue of its larger size, the Board
     believes that the surviving company also should have improved access to
     capital markets, which should make additional debt or other financing
     available upon more attractive terms.
 
          (iii) Increased Market Capitalization and Liquidity.  Based on the
     closing price of EOP Common Shares on September 12, 1997, the surviving
     company would have a total market capitalization of approximately $11.2
     billion. The larger total market capitalization will likely result in
     higher trading volumes for EOP Common Shares, and enhanced liquidity for
     the EOP Shareholders. The liquidity of the EOP Common Shares will be
     further enhanced over time as the restrictions imposed by the securities
     laws on public sale of the EOP Common Shares held by certain EOP
     Shareholders expire.
 
          (iv) Cost Savings and Operating Efficiencies.  The Beacon Board
     believes that the opportunities for economies of scale and operating
     efficiencies from the Mergers will result in significant cost savings to
     the surviving company, particularly as a result of reductions in overhead
     expenses. While the Beacon Board did not attempt to quantify these savings
     with precision, EOP has informed Beacon that it believes that
 
                                       39
<PAGE>   48
 
     approximately $15 to $20 million of corporate level general administrative
     expenses may be eliminated as a result of the Mergers. See "SUMMARY
     UNAUDITED PRO FORMA COMBINED FINANCIAL DATA."
 
          (v) Structure and Tax-Free Nature of the Mergers.  The Beacon Board
     viewed as favorable to its determination the fact that the Partnership
     Merger, as a "unit-for-unit" rather than a "cash-for-unit" transaction,
     and, thus, will provide the Beacon Unitholders with an opportunity to share
     in any future appreciation of EOP Partnership, as well as the fact that the
     Mergers generally will allow Beacon Unitholders to convert their Beacon
     Partnership Units into EOP Partnership Units while deferring at least a
     substantial portion of the taxable gain that otherwise would be recognized
     in a cash transaction.
 
          (vi) Termination Rights in the Event of a Superior Acquisition
     Proposal and Break-Up Fee.  The Beacon Board considered the provisions of
     the Agreement permitting it to receive unsolicited inquiries and proposals,
     concerning other potential business combinations and to enter into
     discussions or negotiations concerning such combinations with third parties
     to the extent required by the fiduciary duties of the Beacon Board and to
     terminate the Agreement upon payment to EOP of the Break-Up Fee of up to
     $75 million if the Beacon Board, in the exercise of its fiduciary duties,
     withdraws or modifies in any manner adverse to EOP its approval or
     recommendation of the Mergers or the Agreement in connection with, or
     approved or recommended, any Superior Acquisition Proposal.
 
          (vii) Termination Rights of Beacon in the Event of a Decrease in the
     Price of EOP Common Shares. Under the terms of the Agreement, Beacon also
     has the right to terminate the Agreement and withdraw from the Mergers if
     the average of the closing prices of EOP Common Shares for the twenty
     consecutive trading days preceding the seventh trading day prior to the
     Beacon Special Meeting decreases below $27.39 per share.
 
          (viii) Morgan Stanley Fairness Opinion.  The Beacon Board considered
     as favorable to its determination the opinion, analyses and presentations
     of Morgan Stanley described under "-- Opinion of Beacon Financial Advisor"
     below, including the opinion of Morgan Stanley to the effect that, as of
     the date of such opinion, and based upon and subject to certain matters
     stated therein, the consideration to be received by the Beacon Shareholders
     pursuant to the Agreement is fair from a financial point of view to such
     holders. While Morgan Stanley's opinion did not specifically address the
     fairness of the consideration to be received by Beacon Unitholders, the
     Beacon Board believes that such opinion is relevant to the Beacon
     Unitholders because the value of the EOP Partnership Units to be received
     by the Beacon Unitholders is derived from, and is substantially equivalent
     to, the value of the EOP Common Shares to be received by Beacon
     Shareholders in the Company Merger.
 
     The Beacon Board also considered the following potentially negative factors
in its deliberations concerning the Mergers:
 
          (i) Limited Public Trading History.  EOP completed its IPO in July
     1997 and, consequently, EOP Common Shares have a limited trading history in
     the public market. The Beacon Board, however, did note that the value of an
     EOP Common Share had increased 24.4% from its closing price on the first
     day after the IPO to its closing price on September 12, 1997 (the last
     trading day prior to the public announcement of the Mergers).
 
          (ii) Limited Public Float.  Despite EOP's large total market
     capitalization, as of September 12, 1997, EOP Shareholders holding 136.5
     million EOP Common Shares have restrictions imposed by the securities laws
     on their ability to sell their holdings (while only approximately 28.7
     million EOP Common Shares were sold publicly in EOP's IPO), thus limiting
     EOP's public float at this time. The expiration of these restrictions over
     time may affect the trading market for EOP Common Shares.
 
          (iii) Distribution Reduction.  The Beacon Unitholders will receive a
     distribution per EOP Partnership Unit after the Partnership Merger of $.42
     per EOP Partnership Unit, as compared to Beacon Partnership's current
     quarterly distribution of $.50 per Beacon Partnership Unit.
 
                                       40
<PAGE>   49
 
          (iv) Fixed Exchange Ratio.  The Exchange Ratio is fixed and not
     subject to adjustment, and thus, a decrease in the trading price of EOP
     Common Shares prior to the Effective Time will reduce the consideration
     paid to Beacon Unitholders (as implied by the value of the EOP Common
     Shares) in the Partnership Merger. Despite Beacon's right to withdraw from
     the Mergers if the average of the closing prices of EOP Common Shares
     decreases below $27.39 in the period prior to the Beacon Special Meeting, a
     significant decrease in the consideration to be paid could still occur
     without triggering Beacon's termination right. Based on the closing price
     of EOP Common Shares on September 12, 1997, Beacon Unitholders would
     receive EOP Partnership Units in the Partnership Merger having a value of
     $47.02 per unit.
 
          (v) Anticipated Benefits May Not Be Realized.  The Beacon Board
     considered the risk that the anticipated benefits of the Partnership Merger
     to Beacon Unitholders may not be realized as a result of possible changes
     in the real estate market in general, the inability to achieve the
     anticipated reductions in expenses or other potential difficulties in
     integrating the two companies and their respective operations.
 
          (vi) Significant Costs Involved.  The Beacon Board considered the
     significant costs involved in connection with consummating the Mergers, the
     substantial management time and effort required to effectuate the Mergers
     and integrate the businesses of Beacon and EOP and the related disruption
     to Beacon's operations.
 
     The Beacon Board also considered the potential benefits to certain
directors and officers discussed below in "-- Conflict of Interest Arising from
Benefits to Certain Officers and Directors of Beacon," including the provisions
of the Senior Executive Severance Agreements with each of Alan Leventhal and
Lionel Fortin, the Executive Severance Plan, acceleration of the vesting of
certain options to acquire Beacon Common Shares, certain agreements restricting
the sale or refinancing of certain Beacon Properties and the Stock Purchase
Agreements.
 
     In the opinion of the Beacon Board, the above factors represent the
material potential adverse consequences which could occur as a result of the
Mergers. In considering the Mergers, the Beacon Board considered the impact of
these factors on existing Beacon Unitholders.
 
     In view of the wide variety of factors considered by the Beacon Board, the
Beacon Board did not quantify or otherwise attempt to assign relative weights to
the specific factors that it considered in making its determination. However, in
the view of the Beacon Board, the potentially negative factors considered by it
were not sufficient, either individually or collectively, to outweigh the
positive factors considered by the Beacon Board in its deliberations relating to
the Mergers.
 
     In the event the Mergers are not consummated for any reason, Beacon will
continue to pursue its business objectives of (i) maximizing Funds from
Operations and cash available for distribution to holders of Beacon Partnership
Units, (ii) increasing distributions per Beacon Partnership Unit, (iii)
increasing rental revenues and (iv) continuing its growth through the active
acquisition and development of commercial properties. In addition, Beacon may
seek other business combination opportunities and additional debt and/or equity
financing. The Beacon Board believes that there are no feasible alternatives to
the Mergers available to Beacon at the present time that are likely to result in
greater unitholder value.
 
OPINION OF BEACON FINANCIAL ADVISOR
 
     Morgan Stanley was retained by Beacon as its financial advisor in
connection with the Mergers. Morgan Stanley is an internationally recognized
investment banking firm and was selected by Beacon based on Morgan Stanley's
qualifications, experience, expertise and reputation. As part of its investment
banking business, Morgan Stanley is regularly engaged in the valuation of
businesses and securities in connection with mergers and acquisitions,
negotiated underwritings, competitive biddings, secondary distributions of
listed and unlisted securities, private placements and valuation for estate,
corporate and other purposes.
 
     In connection with Morgan Stanley's engagement, the Beacon Board requested
that Morgan Stanley evaluate the fairness, from a financial point of view to the
Beacon Shareholders, of the consideration to be received by the Beacon
Shareholders pursuant to the Agreement. On September 14, 1997, Morgan Stanley
 
                                       41
<PAGE>   50
 
rendered to the Beacon Board an oral opinion to the effect that, as of such date
and subject to certain assumptions, limitations and other matters stated
therein, the aggregate consideration to be received by the Beacon Shareholders
pursuant to the Agreement was fair from a financial point of view to the Beacon
Shareholders. Morgan Stanley subsequently confirmed its oral opinion of
September 14, 1997, by delivery of a written opinion dated September 15, 1997
(the "Morgan Stanley Opinion"). Although Morgan Stanley evaluated the fairness,
from a financial point of view to the Beacon Shareholders, of the aggregate
consideration to be paid by EOP to acquire Beacon pursuant to the Agreement, the
specific consideration payable in the Merger and the terms of the Agreement were
determined by the Beacon Board and Beacon management through arm's length
negotiation. Morgan Stanley's opinion did not specifically address the fairness
of the consideration to be received by Beacon Unitholders.
 
     THE FULL TEXT OF THE MORGAN STANLEY OPINION, WHICH SETS FORTH, AMONG OTHER
THINGS, ASSUMPTIONS MADE, PROCEDURES FOLLOWED, MATTERS CONSIDERED AND
LIMITATIONS ON THE REVIEW UNDERTAKEN, IS ATTACHED HERETO AS ANNEX II. BEACON
UNITHOLDERS ARE URGED TO, AND SHOULD, READ THE MORGAN STANLEY OPINION CAREFULLY
AND IN ITS ENTIRETY. THE MORGAN STANLEY OPINION IS DIRECTED TO THE BEACON BOARD
AND ADDRESSES ONLY THE FAIRNESS FROM A FINANCIAL POINT OF VIEW TO THE BEACON
SHAREHOLDERS OF THE CONSIDERATION TO BE RECEIVED BY THE BEACON SHAREHOLDERS
PURSUANT TO THE AGREEMENT, AND IT DOES NOT ADDRESS ANY OTHER ASPECT OF THE
MERGERS. THE MORGAN STANLEY OPINION DOES NOT CONSTITUTE AN OPINION OR A
RECOMMENDATION AS TO HOW ANY BEACON UNITHOLDER SHOULD VOTE WITH RESPECT TO THE
TRANSACTION. THE SUMMARY OF THE MORGAN STANLEY OPINION SET FORTH HEREIN IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF SUCH OPINION.
 
     In arriving at its opinion, Morgan Stanley has: (i) reviewed certain
publicly available financial statements and other information of Beacon and EOP,
respectively; (ii) reviewed certain internal financial statements and other
financial and operating data concerning Beacon and EOP prepared by the
managements of Beacon and EOP, respectively; (iii) analyzed certain financial
projections for Beacon and EOP prepared by the managements of Beacon and EOP,
respectively; (iv) reviewed the reported prices and trading activity for the
Beacon Common Shares and EOP Common Shares; (v) compared the financial
performance of Beacon and EOP and the prices and trading activity of the Beacon
Common Shares and EOP Common Shares with that of certain other comparable
publicly traded companies and their securities; (vi) discussed with the senior
management of Beacon and EOP their preliminary estimates of the synergies and
cost savings expected to be derived from the Company Merger; (vii) reviewed the
financial terms, to the extent publicly available, of certain comparable
transactions; (viii) reviewed the pro forma impact of the Company Merger on the
EOP's Funds from Operations per share, consolidated capitalization and financial
ratios; (ix) participated in discussions and negotiations among representatives
of Beacon and EOP and their financial and legal advisors; (x) reviewed the
Agreement and certain related documents; and (xi) performed such other analyses
as Morgan Stanley has deemed appropriate.
 
     In preparing the Morgan Stanley Opinion, Morgan Stanley has assumed and
relied upon, without independent verification, the accuracy and completeness of
the information reviewed by Morgan Stanley for the purposes of its opinion. With
respect to the financial projections, including the preliminary estimates of
synergies and cost savings expected to be derived from the Merger, Morgan
Stanley assumed that they were reasonably prepared on bases reflecting the best
currently available estimates and judgments of the future financial performance
of Beacon and EOP. Morgan Stanley did not make any independent valuation or
appraisal of the assets or liabilities of Beacon or EOP, nor was Morgan Stanley
furnished with any such appraisals. Morgan Stanley noted that EOP completed its
IPO on July 7, 1997 and, accordingly, has a limited trading and operating
history as a public company. The Morgan Stanley Opinion was necessarily based on
economic, market and other conditions as in effect on, and the information made
available to, Morgan Stanley as of such date.
 
                                       42
<PAGE>   51
 
     Morgan Stanley expressed no opinion as to what the value of the EOP Common
Shares will be when issued to the Beacon Shareholders or the prices at which the
EOP Common Shares will trade after the Mergers. In addition, the Morgan Stanley
opinion does not evaluate the relative merits of the Mergers as compared to any
other alternative business strategy.
 
     The following is a brief summary of material analyses performed by Morgan
Stanley, which Morgan Stanley presented and reviewed with the Beacon Board on
September 14, 1997, in connection with the oral opinion as of such date and in
connection with the Morgan Stanley Opinion.
 
     In the following analyses, Morgan Stanley assumed the implied purchase
price per share for Beacon Common Shares was $47.02 (the "Implied Purchase
Price"). Morgan Stanley arrived at this amount by multiplying the 1.4063
Exchange Ratio by $33.4375, the closing price of EOP Common Shares on the NYSE
on September 12, 1997.
 
     SELECTED COMPARABLE PUBLIC COMPANIES ANALYSIS.  As part of its analysis,
Morgan Stanley compared selected historical and projected financial and
operating data of both Beacon and EOP with the corresponding data and stock
market performance data of certain publicly traded companies that Morgan Stanley
considered comparable in certain respects to Beacon and EOP. The comparable
companies consisted of nine office REITs. Morgan Stanley selected these
companies on the basis of corporate structure, asset type, size and portfolio
characteristics. The comparable companies included: (i) Boston Properties, Inc.;
(ii) Cali Realty Corporation; (iii) CarrAmerica Realty Corporation; (iv)
Cornerstone Properties, Inc.; (v) Duke Realty Investments, Inc.; (vi) Highwoods
Properties, Inc.; (vii) Prentiss Properties Trust; (viii) Reckson Associates
Realty Corp.; (ix) Spieker Properties, Inc.; (x) Beacon (when comparing
comparable companies to EOP); and (xi) EOP (when comparing comparable companies
to Beacon) (collectively, the "Peer Group").
 
     Morgan Stanley calculated trading statistics for each member of the Peer
Group including: (i) the multiple of the common stock trading price as of
September 12, 1997 (the "Share Price") to forecasted 1997 Funds from Operations
("FFO") and to forecasted 1998 FFO (each an "FFO Multiple"); (ii) the multiple
of the Share Price to "adjusted" forecasted 1997 FFO and to "adjusted"
forecasted 1998 FFO (each an "AFFO Multiple"), where "adjusted" means a
normalized reserve for capitalized leasing and maintenance costs, and straight
line rent adjustment and gains from land sales have been subtracted from
forecasted 1997 and forecasted 1998 FFO; (iii) the multiple of 1998 forecasted
FFO to Share Price to the forecasted funds from operations five year growth rate
("FFO to Growth Multiple"); and (iv) the premium obtained by computing the
percentage excess of the Share Price over the net asset value per share
("Premium to NAV"). Morgan Stanley then calculated the high, median and low
statistics for the Peer Group. All FFO estimates and growth rates for the Peer
Group were based on consensus security analyst estimates as reported by First
Call as of September 13, 1997, except for the forecasted funds from operations
five year growth rate for EOP, which was from Merrill Lynch Research. All AFFO
estimates and net asset value per share estimates were from Realty Stock Review
as of August 29, 1997. The estimates published by First Call and Realty Stock
Review, a publication of the Dow Jones Financial Publishing Corp. which presents
monthly market analyses of REITs and operating companies, were not prepared in
connection with the Mergers or at Morgan Stanley's request.
 
     For the Peer Group, Morgan Stanley noted that (i) FFO multiples ranged from
11.9x to 19.7x forecasted 1997 funds from operations, and 10.7x to 17.4x
forecasted 1998 funds from operations; (ii) AFFO multiples ranged from 14.5x to
26.1x forecasted 1997 adjusted funds from operations, and 13.3x to 24.1x
forecasted 1998 adjusted funds from operations; (iii) 1998 FFO to Growth
Multiples ranged from 1.1x to 2.1x the forecasted funds from operations five
year growth rate; and (iv) Premiums to NAV ranged from 23% to 70% over the
estimated net asset value per share. Morgan Stanley also noted that (i) the
median FFO multiples when Beacon was excluded from the Peer Group and when EOP
was excluded from the Peer Group were 14.4x and 14.0x forecasted 1997 FFO,
respectively, and 12.6x and 12.5x forecasted 1998 FFO, respectively; (ii) the
median AFFO multiples with Beacon and with EOP excluded from the Peer Group were
15.9x and 15.9x forecasted 1997 adjusted funds from operations, respectively,
and 14.4x and 14.4x forecasted 1998 adjusted funds from operations,
respectively; (iii) the median 1998 FFO to Growth Multiple with EOP excluded
from the Peer Group was 1.4x the forecasted funds from operations five year
growth rate; and (iv) the median
 
                                       43
<PAGE>   52
 
Premiums to net asset value with Beacon and with EOP excluded from the Peer
Group were 33% and 31% over the estimated net asset value per share,
respectively.
 
     Morgan Stanley derived a range of valuations for EOP from the Peer Group
data set forth above. Applying the range of FFO multiples derived from the Peer
Group (excluding EOP and the remaining high and low multiples from the Peer
Group) of 10.7x to 13.6x forecasted 1998 funds from operations to the First Call
consensus forecasted 1998 funds from operations for EOP resulted in a low to
high range of Share Prices for EOP of $20.57 to $26.06. Applying the range of
FFO to Growth Multiples derived from the Peer Group (excluding EOP and the
remaining high and low multiples from the Peer Group) of 1.2x to 1.6x the
forecasted funds from operations five year growth rate for EOP resulted in a low
to high range of 1998 FFO multiples of 14.7x to 18.8x forecasted 1998 funds from
operations for EOP. These forecasted 1998 FFO multiples result in a low to high
range of Share Prices for EOP of $28.20 to $36.08. Applying the range of
premiums at which the Share Price is trading over net asset value per share for
the Peer Group (excluding EOP and the remaining high and low premiums from the
Peer Group) of 24% to 52% above the net asset value per share (as estimated by
Realty Stock Review) for EOP resulted in a low to high range of Share Prices for
EOP of $24.44 to $29.95.
 
     Morgan Stanley derived a range of valuations for Beacon from the Peer Group
data as well. Applying the range of FFO multiples derived from the Peer Group
(excluding Beacon and the remaining high and low multiples from the Peer Group)
of 10.7x to 13.7x forecasted 1998 funds from operations to the First Call
consensus forecasted 1998 funds from operations for Beacon resulted in a low to
high range of Share Prices for Beacon of $33.16 to $42.41. Applying the range of
premiums at which the Share Price is trading over net asset value per share for
the Peer Group (excluding Beacon and the remaining high and low premiums from
the Peer Group) of 24% to 55% above the net asset value per share (as estimated
by Realty Stock Review) for Beacon resulted in a low to high range of Share
Prices for Beacon of $34.70 to $43.32. Morgan Stanley observed that the Implied
Purchase Price for Beacon is above the low and high range (excluding Beacon and
the remaining high and low multiples from the Peer Group) of the implied equity
valuation of Beacon and thus, such analysis supports Morgan Stanley's conclusion
that the Merger Consideration to be received by the Beacon Shareholders pursuant
to the Merger is fair to the Beacon Shareholders from a financial point of view.
 
     As part of its analysis, Morgan Stanley also compared selected projected
financial and operating data of EOP with the corresponding data and stock market
performance data of another group of publicly traded companies that Morgan
Stanley considered comparable in certain respects to EOP. The comparable
companies consisted of seven REITs. Morgan Stanley selected these companies on
the basis of corporate structure, and the size relative to other publicly traded
companies in their respective asset sector categories. Morgan Stanley selected
the largest REITs in six REIT industry sectors. The companies selected included:
(i) Equity Residential Properties Trust in the multifamily REIT sector; (ii)
Starwood Lodging Trust in the hotel REIT sector; (iii) Simon DeBartolo Group,
Inc. in the regional mall REIT sector; (iv) Vornado Realty Trust in the non-mall
retail REIT sector; (v) Public Storage, Inc. in the self-storage REIT sector;
(vi) Meditrust in the health care REIT sector; and (vii) The Mills Corporation
in the factory outlet center REIT sector (collectively, "Peer Group II").
 
     For Peer Group II, Morgan Stanley noted that the premium obtained by
computing the percentage excess of each company's FFO multiple over the median
1998 FFO multiples for each company's respective industry sector ("Premium to
Sector Median") ranged from 5.4% to 70.5%. Morgan Stanley derived a range of
valuations for EOP from the Peer Group II data set forth above. Applying the
range of Premiums to Sector Median derived from Peer Group II (excluding the
high and low multiples from Peer Group II) of 8.1% to 48.9% over the median 1998
FFO multiple for the office REIT sector for EOP resulted in a low to high range
of Share Prices for EOP of $25.71 to $35.41.
 
     No company utilized in the comparable company analyses for purposes of
comparison to EOP and Beacon is identical to EOP or Beacon. In selecting and
evaluating the Peer Group and Peer Group II, Morgan Stanley made certain
judgments and assumptions with regard to industry performance, general business,
economic, market and financial conditions and other matters. Mathematical
analysis (such as determining the
 
                                       44
<PAGE>   53
 
average or median) of certain financial ratios of the Peer Group and Peer Group
II is not in itself a meaningful method of using comparable company data.
 
     COMPARABLE TRANSACTION ANALYSIS.  Using publicly available information,
Morgan Stanley compared the principal terms of the Merger with those of selected
other comparable transactions ("Comparable Transactions"). These transactions
(some of which are pending), all involving combinations of two REITs, were the
mergers of: (i) Equity Residential Properties Trust with Evans Withycombe
Residential, Inc.; (ii) Post Properties, Inc. with Columbus Realty Trust; (iii)
Equity Residential Properties Trust with Wellsford Residential Property Trust;
(iv) Camden Property Trust with Paragon Group, Inc.; (v) United Dominion Realty
Trust, Inc. with South West Property Trust, Inc.; (vi) Chateau Communities, Inc.
with ROC Communities, Inc.; (vii) Highwoods Properties, Inc. with Crocker Realty
Trust, Inc.; (viii) Simon Property Group with DeBartolo Realty Corp.; (ix)
Eastgroup Properties, Inc. with Copley Properties, Inc.; (x) Bradley Real
Estate, Inc. with Tucker Properties Corp.; (xi) BRE Properties, Inc. with Real
Estate Investment Trust of California; (xii) Horizon Outlet Centers, Inc. with
McArthur Glen Realty Corp.; and (xiii) Wellsford Residential Property Trust with
Holly Residential Properties, Inc. Morgan Stanley noted that the premiums which
the acquiring companies paid over the targets' unaffected share price ("Premiums
to Unaffected Share Price" defined by computing the percentage excess of the
price per share paid over the average stock price for the ten trading days
ending five trading days prior to the announcement of the transaction) and the
premiums which the acquiring companies paid over the targets' 52 week high share
price ("Premiums to 52 Week High Share Price" defined by computing the
percentage excess of the price per share paid over the high share price over the
course of the 52 weeks prior to the announcement of the transaction) ranged from
- -2.3% to 59.0% and -40.0% to 16.0%, respectively.
 
     Morgan Stanley derived a range of valuations for Beacon from the Comparable
Transactions data. Applying the range of Premiums to Unaffected Share Price
derived from the Comparable Transactions (excluding the high and low premiums
from the Comparable Transactions) of 4.8% to 23.0% to the current Beacon share
price resulted in a low to high range of Share Prices for Beacon of $38.38 to
$45.05. Applying the range of Premiums to 52 Week High Share Price derived from
the Comparable Transactions (excluding the high and low premiums from the
Comparable Transactions) of -21.4% to 12.1% to the current Beacon share price
resulted in a low to high range of Share Prices for Beacon of $28.79 to $41.06.
Morgan Stanley observed that the Implied Purchase Price for Beacon is above the
low and high range (excluding the high and low premiums from the Comparable
Transactions) of the implied equity valuation of Beacon and thus, such analysis
supports Morgan Stanley's conclusion that the Merger Consideration to be
received by the Beacon Shareholders pursuant to the Company Merger is fair to
the Beacon Shareholders from a financial point of view.
 
     No transaction considered for purposes of the Comparable Transaction
analysis is identical to the Mergers. In evaluating the Comparable Transactions,
Morgan Stanley made certain judgments and assumptions with regard to industry
performance, general business, economic, market and financial conditions and
other matters. Mathematical analysis (such as determining the average or median)
is not in itself a meaningful method of using Comparable Transactions data.
 
     STOCK TRADING HISTORY.  Morgan Stanley reviewed the historical trading
prices for the EOP Common Shares from EOP's IPO through September 12, 1997, and
noted that the low and high closing prices for EOP Common Shares for this period
were $25.25 and $33.50, respectively. Morgan Stanley also reviewed the
historical trading prices for Beacon Common Shares for the last twelve months
ended September 12, 1997, and noted that the low and high closing prices for the
Beacon Common Shares for this period were $27.38 and $37.00, respectively.
 
     Morgan Stanley also reviewed the premium obtained by computing the
percentage excess of the product of the closing prices of EOP Common Shares and
1.4063 over the closing prices of Beacon Common Shares for each day of trading
from EOP's IPO on July 8, 1997 through September 12, 1997, and computed the
average value of these premiums for the entire period and for the last one week,
one month and six weeks of this period. These premiums averaged 28.0%, 20.0%,
19.1% and 15.6% for the last one week, one month, six weeks and entire period
ended September 12, 1997, and was 28.4% on September 12, 1997.
 
                                       45
<PAGE>   54
 
     HISTORICAL IMPLIED EXCHANGE RATIOS.  Morgan Stanley also computed the
historical ratios of the closing share prices of Beacon to EOP for each day of
trading from EOP's IPO on July 8, 1997 through September 12, 1997, and noted
that the averages of such ratios were 1.099, 1.174, 1.183 and 1.221 for the last
one week, one month, six weeks and entire period ending September 12, 1997, and
was 1.095 on September 12, 1997, as compared to the Exchange Ratio of 1.4063.
 
     DISCOUNTED CASH FLOW ANALYSIS.  Morgan Stanley performed discounted cash
flow analyses of EOP based upon projections and assumptions provided by EOP's
management of EOP's FFO per EOP Common Share and by maintaining a constant
distribution payout ratio ("Distribution Payout Ratio," defined as the ratio of
distributions per share of common stock over FFO per share of common stock)
equal to EOP's current Distribution Payout Ratio for the years ending December
31, 1998 to December 31, 2002, using discount rates reflecting an expected
equity total return of 12.0% to 15.0% and terminal multiples of 2003 FFO of
15.0x to 17.5x (Morgan Stanley, for the purposes of this valuation, derived 2003
FFO by growing 2002 FFO at a rate equal to the compound annual growth rate of
FFO from 1998-2002). The range of present values per EOP Common Share was $30.13
to $39.08.
 
     Morgan Stanley performed discounted cash flow analyses of Beacon based upon
projections and assumptions provided by Beacon's management of Beacon's FFO per
Beacon Common Share assuming no external growth (i.e., no acquisitions) and by
maintaining a constant Distribution Payout Ratio equal to Beacon's current
Distribution Payout Ratio for the years ending December 31, 1998 to December 31,
2002, using discount rates reflecting an expected equity total return of 10.0%
to 12.0% and terminal multiples of 2003 FFO of 11.0x to 13.0x (Morgan Stanley,
for the purposes of this valuation, derived 2003 FFO by growing 2002 FFO at a
rate equal to the compound annual growth rate of FFO from 1998-2002). The
expected equity total return and terminal multiples were affected by the
assumption of no external growth for these analyses. The range of present values
per Beacon Common Share was $32.43 to $40.09. Morgan Stanley observed that the
Implied Purchase Price for Beacon is above the range of the implied equity
valuation of Beacon and thus, such analysis supports Morgan Stanley's conclusion
that the Merger Consideration to be received by the Beacon Shareholders pursuant
to the Company Merger is fair to the Beacon Shareholders from a financial point
of view.
 
     PRO FORMA MERGER ANALYSIS.  As part of its analysis, Morgan Stanley
analyzed certain pro forma effects of the Mergers for the fiscal years ended
1997 and 1998. These analyses were based on the First Call consensus estimates
of FFO per share for EOP and Beacon, certain synergies, and certain other
adjustments Morgan Stanley deemed appropriate.
 
     Morgan Stanley also compared EOP's projected stand-alone FFO per share to
EOP's pro forma combined FFO per share resulting from the Mergers. Morgan
Stanley observed that, after giving effect to expected synergies of $20.0
million for fiscal year 1997 and 1998, an accounting adjustment of $5.8 million
for fiscal year 1997 and $5.3 million for fiscal year 1998 and transaction
expenses then estimated at $142.2 million to be financed with debt at a weighted
average interest rate of 7.45%, the transaction would be accretive to FFO per
share in the amount of $.15 per share in 1997, an 8.6% increase over projected
stand-alone FFO per share, and $.15 per share in 1998, a 7.6% increase over
projected stand-alone FFO per share.
 
     The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to a partial analysis or summary description. In
arriving at its opinion, Morgan Stanley considered the results of all of its
analyses as a whole and did not attribute any particular weight to any
particular analysis or factor considered by it. Furthermore, selecting any
portions of Morgan Stanley's analyses, without considering all analyses, would
create an incomplete view of the process underlying the Morgan Stanley Opinion.
In addition, Morgan Stanley may have deemed various assumptions more or less
probable than other assumptions, so that the ranges of valuations resulting from
any particular analysis described above should not be taken to be Morgan
Stanley's view of the actual value of EOP or Beacon.
 
     In performing its analyses, Morgan Stanley made numerous assumptions with
respect to industry performance, general business, economic, market and
financial conditions and other matters, many of which are beyond the control of
EOP and Beacon. Where appropriate, Morgan Stanley discounted comparable industry
and/or company data to reflect the combined company's current and projected
operating
 
                                       46
<PAGE>   55
 
performance in relation to that of the relevant industry or comparable company
group. The analyses performed by Morgan Stanley are not necessarily indicative
of actual values, which may be significantly more or less favorable than
suggested by such analyses. Such analyses were prepared solely as a part of
Morgan Stanley's analysis of whether the consideration to be received by the
holders of Beacon Common Shares pursuant to the Agreement is fair from a
financial point of view to such holders, and were conducted in connection with
the delivery of the Morgan Stanley Opinion. The analyses do not purport to be
appraisals or to reflect the prices at which Beacon might actually be sold.
Morgan Stanley was not authorized to solicit, nor did Morgan Stanley solicit,
third-party indications of interest for the acquisition of all or any part of
Beacon.
 
     As described above (see "-- Background of and Reasons for the
Mergers -- Beacon's Reasons for the Mergers; Recommendation of the Beacon
Board"), the Morgan Stanley Opinion and the information provided by Morgan
Stanley to the Beacon Board was one of a number of factors taken into
consideration by the Beacon Board in making its determination to recommend
approval of the Mergers and the Agreement. Consequently, the Morgan Stanley
analyses described above should not be viewed as determinative of the opinion of
the Beacon Board with respect to the value of Beacon and EOP or whether a
different valuation could have been negotiated with EOP. The consideration
received from EOP was determined through negotiations between the Beacon Board
and management of Beacon and EOP and was approved by the Beacon Board. Morgan
Stanley provided advice to the Beacon Board during the course of such
negotiations; however, the decision to enter into the Agreement was solely that
of the Beacon Board.
 
     Pursuant to a letter agreement dated September 15, 1997, Beacon has agreed
to pay Morgan Stanley, upon the delivery of the Morgan Stanley Opinion to the
Beacon Board, a transaction fee of $2.5 million. In addition, Beacon has agreed
to reimburse and to indemnify Morgan Stanley for liabilities and expenses
arising out of the engagement and the transactions in connection therewith,
including liabilities under federal securities laws.
 
     In the ordinary course of its business, Morgan Stanley and its affiliates
may actively trade the debt and equity securities of Beacon and EOP for their
own account and for the accounts of customers and, accordingly, may at any time
hold a long- or short-term position in such securities. Morgan Stanley has
provided financial advisory and investment banking services to EOP and Beacon in
the past, for which services Morgan Stanley has received customary fees.
 
EFFECTIVE TIME OF THE MERGERS
 
     As soon as practicable after satisfaction of all conditions to consummation
of the Mergers (see "-- Conditions to Consummation of the Mergers"), EOP and
Beacon will file articles of merger with the Department and immediately after
consummation of the Company Merger, EOP Partnership will file a certificate of
merger with the Secretary of State of the State of Delaware. The Effective Time
will be such time as shall be specified in the articles of merger and
certificate of merger, not to exceed 30 days after the articles of merger are
accepted for record by the Department. Prior to the filing of the articles of
Merger with the Department, EOP and Beacon each has the right to terminate the
Agreement should the Mergers not be consummated on or before April 15, 1998
(subject to extension by EOP in certain circumstances), provided that it has not
breached in any material respect its obligations under the Agreement in any
manner that shall have proximately contributed to the occurrence of the failure
of the Mergers to be consummated before such date. See "-- Termination,
Extension, Amendment, and Waiver."
 
     Until the Effective Time, Beacon Unitholders will retain their rights as
limited partners of Beacon Partnership to vote on matters submitted to them.
 
EXCHANGE RATIOS AND EXCHANGE OF EOP COMMON SHARES, EOP PREFERRED SHARES AND EOP
PARTNERSHIP UNITS
 
     At the Effective Time, (i) each outstanding Beacon Preferred Unit will be
converted into the right to receive one EOP Preferred Unit, (ii) each
outstanding Beacon Common Share will be converted into the right to receive
1.4063 EOP Common Shares, with cash in lieu of the issuance of any fractional
interests as described below, (iii) each outstanding Beacon Partnership Unit
will be converted into the right to receive
 
                                       47
<PAGE>   56
 
1.4063 EOP Partnership Units, with cash in lieu of the issuance of any
fractional interests as described below and (iv) each outstanding Beacon
Preferred Share will be converted into the right to receive one EOP Preferred
Share. In lieu of the issuance of any fractional EOP Common Shares or EOP
Partnership Units, each holder of Beacon Common Shares upon surrender of a
certificate for exchange and each holder of Beacon Partnership Units shall be
paid an amount in cash (without interest), rounded to the nearest cent,
determined by multiplying (i) the average closing price of one EOP Common Share
on the NYSE on the five trading days immediately preceding the closing date by
(ii) the fractional amount of the EOP Common Shares or EOP Partnership Units
which such holder would otherwise be entitled to receive under the Agreement.
 
     Following the Mergers, each EOP Partnership Unit received by Beacon
Unitholders in the Partnership Merger will be redeemable for one EOP Common
Share or, at EOP's option, the cash equivalent thereof.
 
     At the Effective Time, all outstanding options under Beacon's Amended and
Restated 1994 Stock Option and Incentive Plan and Beacon's 1996 Stock Option
Plan (collectively, the "Beacon Stock Options") will vest and be immediately
exercisable, be assumed by EOP and be deemed to constitute an option to acquire
the same number of EOP Common Shares as the holder of such Beacon Stock Option
would have been entitled to receive pursuant to the Company Merger had such
holder exercised such Beacon Stock Option in full immediately prior to the
Effective Time. Such EOP Common Shares may be purchased at a price per share
equal to the aggregate exercise price for the Beacon Common Shares subject to
such Beacon Stock Option divided by the number of full EOP Common Shares deemed
to be purchasable pursuant to such Beacon Stock Option. All such Beacon Stock
Options held by directors of Beacon and officers of Beacon above the office of
Vice President will expire on the next business day following the closing date
under the Agreement. All such Beacon Stock Options held by any other person will
expire (i) six months after the closing date, if such person's employment
terminates prior to or during such six-month period or (ii) on the date on which
such Beacon Stock Options expire in accordance with their terms, if such
person's employment does not terminate prior to or during such six-month period.
EOP has agreed to use its reasonable best efforts to arrange a transaction
whereby each person who exercises his Beacon Stock Option on or within one
business day after the date of the Company Merger will receive (other than from
EOP or any of its Subsidiaries) a cash amount per Beacon Stock Option equal to
the excess, if any, of the fair market value of the EOP Common Shares underlying
such Beacon Stock Option over the deemed exercise price thereof, and whereby EOP
will receive a cash amount equal to the aggregate exercise price of such Beacon
Stock Option. In the case of any such transaction, EOP would not be responsible
for the brokerage commissions incurred on behalf of any director or officer who
is above the level of Vice President. As of September 12, 1997, the number of
Beacon Common Shares purchasable pursuant to outstanding Beacon Stock Options
was 3,493,016. The weighted average per share exercise price of such outstanding
Beacon Stock Options was $27.23, representing an aggregate of approximately $95
million payable by the holders of such Beacon Stock Options upon the exercise
thereof.
 
DISTRIBUTIONS
 
     Except for Beacon's regularly quarterly distributions not in excess of $.50
per Beacon Common Share, Beacon has agreed not to declare, set aside or pay any
distributions on the Beacon Common Shares prior to the Effective Time.
Notwithstanding the foregoing, to the extent necessary to satisfy the
requirements of Section 857(a)(1) of the Code for the taxable year of Beacon
ending at the Effective Time (and to avoid the payment of tax with respect to
undistributed income), Beacon will declare a distribution (the "Final Beacon
Distribution") to holders of Beacon Common Shares, the record date for which
will be the close of business on the last business day prior to the Effective
Time, in an amount equal to the minimum distribution sufficient to permit Beacon
to satisfy such requirements, and, in such event this will necessitate the
making of a corresponding distribution by Beacon Partnership. If Beacon
determines it necessary to declare the Final Beacon Distribution, it will notify
EOP at least ten days prior to the date for the Beacon Special Meeting, and EOP
will declare a distribution per share to holders of EOP Common Shares, the
record date for which will be the close of business on the last business day
prior to the Effective Time, in an amount per EOP Common Share equal to the
quotient obtained by dividing (x) the Final Beacon Distribution per Beacon
Common Share paid by Beacon by (y) 1.4063. Additionally, notwithstanding the
foregoing, (a) Beacon has agreed to
 
                                       48
<PAGE>   57
 
declare and pay to holders of Beacon Common Shares of record as of December 10,
1997, for the fiscal period commencing October 1, 1997 and ending immediately
prior to the Effective Time, a distribution of $.50 per Beacon Common Share,
such distribution to be paid by Beacon, immediately prior to the Effective Time
and (b) EOP has agreed to declare and pay to holders of EOP Common Shares of
record as of December 10, 1997, for the fiscal period commencing October 1, 1997
and ending immediately prior to the Effective Time, a distribution of $.30 per
EOP Common Share, such distribution to be paid by EOP, immediately prior to the
Effective Time and in such event, this will necessitate the making of
corresponding distributions by Beacon Partnership and EOP Partnership. Any
distribution paid pursuant to the foregoing sentence will be in addition to the
Final Beacon Distribution and corresponding EOP distribution.
 
     Distributions declared by EOP after the Effective Time will include
distributions on all EOP Common Shares issued in the Company Merger, but no
distribution with respect to EOP Common Shares with a record date after the
Effective Time will be paid to the holder of any unsurrendered certificates of
Beacon Common Shares with respect to the shares of EOP Common Shares represented
thereby, and no cash payment in lieu of fractional shares will be paid to any
such holder, until the surrender of such certificates as described above.
 
EFFECT OF MERGERS ON THE DECLARATION OF TRUST AND THE EOP BYLAWS AND AGREEMENT
OF LIMITED PARTNERSHIP
 
     The Declaration of Trust and the EOP Bylaws, as in effect immediately prior
to the Effective Time, shall continue in full force and effect after the Company
Merger until further amended in accordance with applicable Maryland law. The
Agreement of Limited Partnership, as amended, of EOP Partnership, as in effect
immediately prior to the Effective Time (the "EOP Partnership Agreement"), shall
continue in full force and effect after the Partnership Merger until further
amended in accordance with applicable Delaware law.
 
HEADQUARTERS
 
     After the Mergers, the headquarters of EOP and EOP Partnership will
continue to be located at Two North Riverside Plaza, Suite 2200, Chicago,
Illinois, the current headquarters of EOP.
 
TRUSTEES AND MANAGEMENT
 
     Following the Effective Time, the trustees of EOP who were trustees
immediately prior thereto will continue to serve for the balance of their
unexpired terms. In addition, Alan M. Leventhal, President, Chief Executive
Officer and a director of Beacon, and Edwin N. Sidman, Chairman of the Beacon
Board, will become trustees of EOP with terms expiring at the first annual
meeting of the EOP Shareholders with respect to which notice is mailed
subsequent to the Effective Time. EOP has agreed that Messrs. Leventhal and
Sidman will thereafter be re-nominated as trustees for terms expiring at the
annual meetings of EOP Shareholders in 2002 and 2001, respectively. Those
persons currently serving as EOP's executive officers and senior management will
continue to be EOP's executive officers and senior management after the Mergers.
EOP will continue to be the managing general partner of EOP Partnership
following consummation of the Mergers. In addition, in the event that Mr. Zell
ceases to be Chairman of the EOP Board prior to the Effective Time, the EOP
Board will designate Mr. Leventhal as Chairman of the EOP Board for a term
consisting of at least twelve consecutive months (subject to Mr. Leventhal
remaining a trustee during such twelve-month period.) EOP will continue to be
the Managing General Partner of EOP Partnership following the consummation of
the Mergers.
 
CONDITIONS TO CONSUMMATION OF THE MERGERS
 
     The respective obligations of EOP and Beacon to effect the Company Merger,
and of EOP Partnership and Beacon Partnership to effect the Partnership Merger,
are subject to the satisfaction of the following conditions: (i) the Agreement
and the transactions contemplated thereby shall have been approved by the EOP
Shareholders, the Beacon Shareholders and the Beacon Preferred Shareholders;
(ii) the Agreement and the transactions contemplated thereby shall have been
approved by the Beacon Unitholders; (iii) the waiting
 
                                       49
<PAGE>   58
 
period (and any extension thereof), if any, under the Hart-Scott-Rodino
Antitrust Improvements Act of 1976 applicable to the Company Merger, the
Partnership Merger and the transactions contemplated by the Stock Purchase
Agreements (as defined below) shall have expired or been terminated; (iv) the
NYSE shall have approved for listing the EOP Common Shares and the EOP Preferred
Shares to be issued in the Company Merger and the EOP Common Shares reserved for
issuance upon redemption of EOP Partnership Units issued in the Partnership
Merger, subject to official notice of issuance; (v) the Registration Statement
shall have become effective and shall not be the subject of any stop order or
proceedings by the Commission seeking a stop order; (vi) no temporary
restraining order, preliminary or permanent injunction or other order issued by
any court of competent jurisdiction or other legal restraint or prohibition
preventing the consummation of the Mergers or any of the other transactions
contemplated by the Agreement shall be in effect; and (vii) EOP shall have
received all state securities or "blue sky" permits and other authorizations
necessary to issue the EOP Common Shares, EOP Preferred Shares and EOP
Partnership Units issuable in the Mergers.
 
     Consummation of the Mergers also is subject to the satisfaction or waiver
by EOP and EOP Partnership or Beacon and Beacon Partnership, as applicable, of
the following conditions: (i) the representations and warranties of each party
contained in the Agreement shall be true and correct in all material respects as
of the date of the Agreement and as of the closing date, except to the extent
that such representation or warranty is expressly limited by its terms to
another date; (ii) each party shall have performed in all material respects all
obligations required to be performed by it under the Agreement at or prior to
the Effective Time; (iii) from the date of the Agreement there shall not have
occurred a material adverse change in the business, financial condition or
results of operations of EOP or Beacon and their respective Subsidiaries taken
as a whole; (iv) EOP and Beacon shall have received opinions of counsel to the
effect described in "FEDERAL INCOME TAX CONSIDERATIONS;" (v) each party shall
have obtained all consents and waivers from third parties necessary in
connection with the transactions contemplated by the Agreement, other than such
consents and waivers which, if not obtained, would not result, individually or
in the aggregate, in a material adverse effect on the business, properties,
assets, financial condition or results of operation on Beacon and its
Subsidiaries taken as a whole or on EOP and its Subsidiaries taken as a whole;
and (vi) EOP and EOP Partnership, on the one hand, and Beacon and Beacon
Partnership, on the other hand, shall have received a "comfort letter" which
complies with the requirements for such letters as set forth in the Agreement.
In addition, consummation of the Mergers is subject to the condition that all of
the voting shares of the Beacon Management Company, the Beacon Design Company
and the Beacon Construction Company (other than any such shares owned by Beacon
Partnership) shall have been transferred to EOP Management Corp., or its
designees or assigns, in accordance with the Stock Purchase Agreements.
 
REPRESENTATIONS AND WARRANTIES
 
     The Agreement includes representations and warranties by Beacon and Beacon
Partnership as to the following: (i) the due organization, standing and power of
Beacon and Beacon's Subsidiaries, and the nature of Beacon's and third parties'
investments in Beacon's Subsidiaries and any other entities; (ii) the
capitalization of Beacon and Beacon's Subsidiaries; (iii) the authorization of
the Agreement and, subject to the requisite approvals, the transactions
contemplated thereby by Beacon and Beacon Partnership; (iv) the enforceability
of the Agreement against Beacon and Beacon Partnership; (v) the noncontravention
(except as specified) by the Agreement of any agreement, law, order or charter
or bylaw or other organizational document provision applicable to Beacon or any
Beacon Subsidiary; (vi) the absence of the need (except as specified) for
governmental or third-party consents to the Mergers; (vii) the accuracy of
Beacon's and Beacon Partnership's documents required to be filed with the
Commission; (viii) the absence of any undisclosed liabilities; (ix) except as
specified, the conduct of Beacon's and Beacon Subsidiaries' businesses in the
ordinary course, and the absence of any material adverse change in the business,
financial condition or results of operations of Beacon and its Subsidiaries
taken as a whole since the date of the most recent audited financial statements
included in the documents filed by Beacon and Beacon Partnership with the
Commission through the date of the Agreement; (x) pending or threatened
litigation; (xi) certain matters relating to the real estate owned by Beacon and
the Beacon Subsidiaries, including without limitation the absence (except as
specified) of liens, security interests or other encumbrances on title or other
restrictions and the outstanding leases or other occupancy rights relating to
such real estate; (xii) certain environmental matters; (xiii) certain
 
                                       50
<PAGE>   59
 
related party transactions; (xiv) the terms, existence, operations, liabilities
and compliance with applicable laws of employee plans of Beacon and its
Subsidiaries, certain other matters relating to the Employee Retirement Income
Security Act of 1974, as amended ("ERISA"), and certain employee policy and
labor matters; (xv) payment of taxes and certain other tax matters; (xvi) bonus
and severance payments payable to employees, officers and directors of Beacon
and its Subsidiaries as a result of the Mergers or a termination of service
subsequent to the Effective Time; (xvii) brokers, finders and financial advisors
engaged by Beacon and its Subsidiaries; (xviii) compliance with applicable laws;
(xix) certain contracts and debt instruments of Beacon and its Subsidiaries;
(xx) the fairness opinion received by Beacon; (xxi) the inapplicability of state
anti-takeover statutes and (xxii) the lack of any requirement of Beacon or any
Beacon Subsidiary to be registered under the Investment Company Act of 1940, as
amended (the "1940 Act").
 
     The Agreement includes representations and warranties by EOP and EOP
Partnership as to the following: (i) the due organization, standing and power of
EOP and EOP's Subsidiaries, and the nature of EOP's and third parties'
investments in EOP's Subsidiaries and any other entities; (ii) the
capitalization of EOP and EOP's Subsidiaries; (iii) the authorization of the
Agreement and, subject to the requisite approvals, the transactions contemplated
thereby by EOP and EOP Partnership; (iv) the enforceability of the Agreement
against EOP and EOP Partnership; (v) the noncontravention (except as specified)
by the Agreement of any agreement, law, order or charter or by-law or other
organizational document provision applicable to EOP or any EOP Subsidiary; (vi)
the absence of the need (except as specified) for governmental or third-party
consents to the Mergers; (vii) the accuracy of EOP's and EOP Partnership's
documents required to be filed with the Commission; (viii) the absence of any
undisclosed liabilities; (ix) except as specified, the conduct of EOP's and EOP
Subsidiaries' businesses in the ordinary course, and the absence of any material
adverse change in the business, financial condition or results of operations of
EOP and its Subsidiaries taken as a whole since the date of the most recent
audited financial statements included in the EOP reports filed with the
Commission through the date of the Agreement; (x) pending or threatened
litigation; (xi) certain matters relating to the real estate owned by EOP and
the EOP Subsidiaries, including, without limitation, the absence (except as
specified) of liens, security interests or other encumbrances on title or other
restrictions and the outstanding leases or other occupancy rights relating to
such real estate, (xii) certain environmental matters; (xiii) payment of taxes
and certain other tax matters; (xiv) brokers, finders and financial advisors
engaged by EOP and its Subsidiaries; (xv) compliance with applicable laws; (xvi)
certain contracts and debt instruments of EOP and its Subsidiaries; (xvii) the
fairness opinion received by EOP; (xviii) the inapplicability of state
anti-takeover statutes; (xix) the lack of any requirement of EOP or any EOP
Subsidiary to be registered under the 1940 Act and (xx) the lack of EOP's status
as an "interested stockholder" of Beacon or an "affiliate of an interested
stockholder" of Beacon within the meaning of Section 3-601 of the MGCL.
 
     The representations and warranties of each of the parties contain various
customary exceptions for materiality, knowledge and previously disclosed
information. The representations and warranties of each of the parties are
deemed to be conditions to the Mergers to the extent provided for in the
Agreement, but will not survive the Mergers.
 
CONDUCT OF BUSINESS PENDING THE MERGERS
 
     Beacon and Beacon Partnership have agreed that, prior to the Effective
Time, except as consented to by EOP in writing or as expressly provided for in
the Agreement, Beacon and Beacon Partnership shall, and shall cause (or, in the
case of Beacon Subsidiaries that Beacon or Beacon Partnership do not control,
shall use reasonable best efforts to cause) each of the Beacon Subsidiaries to:
 
          (i) conduct its business only in the usual, regular and ordinary
     course and in substantially the same manner as heretofore conducted;
 
          (ii) preserve intact its business organizations and goodwill and use
     reasonable best efforts to keep available the services of its officers and
     employees;
 
                                       51
<PAGE>   60
 
          (iii) confer on a regular basis with one or more representatives of
     EOP to report operational matters of materiality and, subject to the
     provisions described in "-- No Solicitation" below, any proposals to engage
     in material transactions;
 
          (iv) promptly notify EOP of any material emergency or other material
     change in the condition (financial or otherwise), business, properties,
     assets, liabilities or the normal course of its businesses or in the
     operation of its properties, or of any material governmental complaints,
     investigations or hearings (or communications indicating that the same may
     be contemplated);
 
          (v) promptly deliver to EOP true and correct copies of any report,
     statement or schedule filed with the Commission subsequent to the date of
     the Agreement;
 
          (vi) maintain its books and records in accordance with GAAP
     consistently applied and not change in any material manner any of its
     methods, principles or practices of accounting in effect on the date of the
     most recent audited financial statements included in the documents filed by
     Beacon and Beacon Partnership with the Commission through the date of the
     Agreement, except as may be required by the Commission, applicable law or
     GAAP;
 
          (vii) duly and timely file all reports, tax returns and other
     documents required to be filed with federal, state, local and other
     authorities, subject to extensions permitted by law, provided Beacon
     notifies EOP that it is availing itself of such extensions and provided
     such extensions do not adversely affect Beacon's status as a REIT under the
     Code;
 
          (viii) not make or rescind any express or deemed election relative to
     taxes (unless required by law or necessary to preserve Beacon's status as a
     REIT or the status of any Beacon Subsidiary as a partnership for federal
     income tax purposes or as a qualified REIT subsidiary under the Code, as
     the case may be);
 
          (ix) make all capital expenditures, and expenditures relating to
     leasing, in accordance with a budget of Beacon approved by EOP, which
     approval shall not be unreasonably withheld, and not (A) acquire, enter
     into any option to acquire, or exercise an option or other right or
     election or enter into any other commitment or contractual obligation
     (each, a "Commitment") for the acquisition of any real property or other
     transaction (other than certain specified Commitments) involving in excess
     of $100,000 which is not included in its budget approved by EOP, (B)
     encumber assets or commence construction of, or enter into any Commitment
     to develop or construct other real estate projects, except in the ordinary
     course of its office property business or (C) incur or enter into any
     Commitment to incur additional indebtedness (secured or unsecured) except
     for working capital under its revolving line(s) of credit and certain
     specified Commitments for indebtedness;
 
          (x) not amend the Beacon Articles or the Beacon Bylaws, or the
     articles or certificate of incorporation, bylaws, code of regulations,
     partnership agreement, operating agreement or joint venture agreement or
     comparable charter or organization document of any Beacon Subsidiary;
 
          (xi) make no change in the number of shares of capital stock,
     membership interests or units of limited partnership interest issued and
     outstanding, other than pursuant to (A) the exercise of specified options
     or (B) the redemption of Beacon Partnership Units under certain specified
     existing contracts, or pursuant to the Beacon Partnership Agreement, for
     cash or, at Beacon's option, Beacon Common Shares;
 
          (xii) grant no options or other right or commitment relating to its
     shares of capital stock, membership interests or units of limited
     partnership interest or any security convertible into its shares of capital
     stock, membership interests or units of limited partnership interest, or
     any security the value of which is measured by shares of capital stock, or
     any security subordinated to the claim of its general creditors and not
     amend or waive any rights under any of the Beacon Share Options described
     in the Agreement;
 
          (xiii) except as discussed in "-- Distributions" above, and except for
     quarterly distributions with respect to the Beacon Common Shares for the
     distribution for the third quarter of 1997 and for each quarterly
     distribution thereafter in an amount up to the distribution per share paid
     by it for the second
 
                                       52
<PAGE>   61
 
     quarter of 1997 and distributions per Beacon Partnership Unit in the same
     amount as a permitted distribution per Beacon Common Share except to the
     extent a distribution by Beacon is necessary to maintain REIT status or
     except in connection with the use of Beacon Common Shares to pay the
     exercise price or tax withholding in connection with equity-based employee
     benefit plans by the participants therein, not (A) authorize, declare, set
     aside or pay any distribution or make any other distribution or payment
     with respect to any Beacon Common Shares or Beacon Partnership Units or (B)
     directly or indirectly redeem, purchase or otherwise acquire any shares of
     capital stock, membership interests or units of partnership interest or any
     option, warrant or right to acquire, or security convertible into, shares
     of capital stock, membership interests, or units of partnership interest of
     Beacon, except for (A) redemptions of Beacon Common Shares required under
     the Beacon Articles in order to preserve the status of Beacon as a REIT
     under the Code, and (B) redemptions of Beacon Partnership Units under the
     Beacon Partnership Agreement in which Beacon Common Shares are utilized;
 
          (xiv) not sell, lease, mortgage, subject to lien or otherwise dispose
     of any of the Beacon Properties, except in connection with a transaction
     that is permitted under clause (ix) above or that is made in the ordinary
     course of business and is the subject of a binding contract in existence on
     the date of the Agreement and disclosed pursuant thereto;
 
          (xv) not sell, lease, mortgage, subject to lien or otherwise dispose
     of any of its personal property or intangible property, except in
     connection with a transaction that is permitted by clause (xiv) above or
     that is made in the ordinary course of business and is not material,
     individually or in the aggregate;
 
          (xvi) not make any loans, advances or capital contributions to, or
     investments in, any other individual, corporation, partnership, limited
     liability company, joint venture, association, trust, unincorporated
     organization or other entity (each, a "Person") other than loans, advances
     and capital contributions to Beacon Subsidiaries in existence on the date
     of the Agreement;
 
          (xvii) not pay, discharge or satisfy any claims, liabilities or
     obligations (absolute, accrued, asserted or unasserted, contingent or
     otherwise), other than the payment, discharge or satisfaction, in the
     ordinary course of business consistent with past practice or in accordance
     with their terms, of liabilities reflected or reserved against in, or
     contemplated by, the most recent consolidated financial statements (or the
     notes thereto) furnished to EOP or incurred in the ordinary course of
     business consistent with past practice;
 
          (xviii) not guarantee the indebtedness of another Person, enter into
     any "keep well" or other agreement to maintain any financial statement
     condition of another Person or enter into any arrangement having the
     economic effect of any of the foregoing;
 
          (xix) not enter into any Commitment with any officer, director or
     affiliate of Beacon or any of the Beacon Subsidiaries or any material
     Commitment with any consultant;
 
          (xx) not increase any compensation or enter into or amend any
     employment agreement disclosed pursuant to the Agreement with any of its
     officers, directors or employees earning more than $50,000 per annum, other
     than as required by any contract or plan or in accordance with waivers by
     employees of benefits under such agreements;
 
          (xxi) not adopt any new employee benefit plan or amend any existing
     plans or rights, except for changes to severance benefits to provide that
     an employee whose position is transferred to a location outside the
     standard metropolitan statistical area in which such employee is currently
     employed shall not forfeit severance benefits by reason of failure to
     accept such transfer, changes which are required by law and changes which
     are not more favorable to participants than provisions presently in effect;
 
          (xxii) not settle any shareholder derivative or class action claims
     arising out of or in connection with any of the transactions contemplated
     by the Agreement;
 
          (xxiii) not change the ownership of any of its Subsidiaries, except
     changes which arise as a result of the acquisition of Beacon Partnership
     Units in exchange for Beacon Common Shares pursuant to exercise of the
     Beacon Partnership Unit redemption right under the Beacon Partnership
     Agreement;
 
                                       53
<PAGE>   62
 
          (xxiv) not accept a promissory note in payment of the exercise price
     payable under any option to purchase Beacon Common Shares; and
 
          (xxv) not enter into, or modify, amend or breach any of certain
     specified agreements.
 
     EOP and EOP Partnership have agreed that, prior to the Effective Time,
except as consented to by Beacon in writing or as expressly provided for in the
Agreement, EOP and EOP Partnership shall, and shall cause (or, in the case of
EOP Subsidiaries that EOP or EOP Partnership do not control, shall use
reasonable best efforts to cause) each of the EOP Subsidiaries to:
 
          (i) preserve intact its business organizations and goodwill and use
     reasonable best efforts to keep available the services of its officers and
     employees;
 
          (ii) confer on a regular basis with one or more representatives of
     Beacon to report operational matters of materiality which would have a
     material adverse effect on the business, properties, assets, financial
     condition or results of operations of EOP and its Subsidiaries taken as
     whole;
 
          (iii) promptly notify Beacon of any material emergency or other
     material change in the condition (financial or otherwise), business,
     properties, assets, liabilities, prospects or the normal course of its
     businesses or in the operation of its properties, or of any material
     governmental complaints, investigations or hearings (or communications
     indicating that the same may be contemplated);
 
          (iv) promptly deliver to Beacon true and correct copies of any report,
     statement or schedule filed with the Commission subsequent to the date of
     the Agreement;
 
          (v) maintain its books and records in accordance with GAAP
     consistently applied and not change in any material manner any of its
     methods, principles or practices of accounting in effect on the date of the
     most recent audited financial statements included in the documents filed by
     EOP and EOP Partnership with the Commission through the date of the
     Agreement, except as may be required by the Commission, applicable law or
     GAAP;
 
          (vi) duly and timely file all reports, tax returns and other documents
     required to be filed with federal, state, local and other authorities,
     subject to extensions permitted by law, provided such extensions do not
     adversely affect EOP's status as a REIT under the Code;
 
          (vii) not make or rescind any express or deemed election relative to
     taxes (unless required by law or necessary to preserve EOP's status as a
     REIT or the status of any EOP Subsidiary as a partnership for federal
     income tax purposes or as a qualified REIT subsidiary under the Code, as
     the case may be);
 
          (viii) not enter into any Commitment for the acquisition of any real
     property (other than specified real estate projects) if the amount of such
     Commitment would cause the aggregate amount of all such Commitments
     subsequent to the date of the Agreement to exceed $1,300,000,000 unless
     such Commitment has been approved by Beacon;
 
          (ix) not amend the Declaration of Trust or the EOP Bylaws, or the
     articles or certificate of incorporation, bylaws, code of regulations,
     partnership agreement, operating agreement or joint venture agreement or
     comparable charter or organization document of any EOP Subsidiary,
     including the EOP Partnership Agreement (except to the extent necessary to
     reflect the admission of additional limited partners and other amendments
     in connection therewith that can be made by EOP without a vote of limited
     partners and that will not, individually or in the aggregate, materially
     adversely affect the rights or obligations of holders of EOP Partnership
     Units);
 
          (x) except as discussed in "-- Distributions" above, and except for
     quarterly distributions with respect to the EOP Common Shares for the
     distribution for the third quarter of 1997 and for each quarterly
     distribution thereafter in an amount up to the distribution per share paid
     by it for the second quarter of 1997 (provided that EOP's distribution per
     share paid by it for the second quarter of 1997 shall be deemed to be $.30)
     or except to the extent a distribution by EOP is necessary to maintain REIT
     status or except in connection with the use of EOP Common Shares to pay the
     exercise price or tax withholding in connection with equity-based employee
     benefit plans by the participants therein, not (A) authorize,
 
                                       54
<PAGE>   63
 
     declare, set aside or pay any distribution or make any other distribution
     or payment with respect to any EOP Common Shares or EOP Partnership Units
     or (B) directly or indirectly redeem, purchase or otherwise acquire any
     shares of capital stock, membership interests or units of partnership
     interest or any option, warrant or right to acquire, or security
     convertible into, shares of capital stock, membership interests, or units
     of partnership interest of EOP, except for (x) redemptions of EOP Common
     Shares required under the Declaration of Trust in order to preserve the
     status of EOP as a REIT under the Code, and (y) redemptions of EOP
     Partnership Units under the EOP Partnership Agreement in which EOP Common
     Shares are utilized;
 
          (xi) not sell, lease, mortgage, subject to lien or otherwise dispose
     of any of the EOP Properties, except in connection with a transaction that
     would not reasonably be expected to have a material adverse effect on the
     business, properties, assets, financial condition or results of operation
     of EOP and its Subsidiaries taken as a whole;
 
          (xii) not sell, lease, mortgage, subject to lien or otherwise dispose
     of any of its personal property or intangible property, except in
     connection with a transaction that is permitted by clause (xi) above or
     that is not material, individually or in the aggregate;
 
          (xiii) not pay, discharge or satisfy any claims, liabilities or
     obligations (absolute, accrued, asserted or unasserted, contingent or
     otherwise) if it would reasonably be expected to have a material adverse
     effect on the business, properties, assets, financial condition or results
     of operation of EOP and its Subsidiaries taken as a whole;
 
          (xiv) not directly or indirectly through a Subsidiary, merge or
     consolidate with, or acquire all or substantially all of the assets of, or
     the beneficial ownership of a majority of the outstanding capital stock or
     other equity interests in any person or entity whose securities are
     registered under the Exchange Act unless such transaction has been approved
     by Beacon; and
 
          (xv) except as contemplated by the Agreement, not issue any EOP or EOP
     Partnership securities pursuant to a registration statement filed with the
     Commission relating to the public offering of any EOP or EOP Partnership
     securities from the date of the Agreement until the date of this Proxy
     Statement/Prospectus unless such issuance has been approved by Beacon.
 
NO SOLICITATION
 
     Beacon has agreed, for itself and in its capacity as general partner of
Beacon Partnership, that neither it nor any of the Beacon Subsidiaries will, nor
will any of them permit any of its officers, directors, employees, affiliates,
agents, investment bankers, financial advisors, attorneys, accountants, brokers,
finders or other representatives to, invite, initiate, solicit or encourage,
directly or indirectly, any inquiries, proposals, discussions or negotiations or
the making or implementation of any proposal or offer (including, without
limitation, any proposal or offer to its shareholders) with respect to a merger,
acquisition, tender offer, exchange offer, transaction resulting in the issuance
of securities representing 10% or more of the outstanding equity securities of
Beacon, consolidation, share exchange, business combination, sale, lease,
exchange, mortgage, pledge, transfer or other disposition of 10% or more of the
assets or equity securities (including, without limitation, partnership
interests and units) of Beacon or Beacon Partnership, other than the
transactions contemplated by the Agreement (any such proposal or offer, an
"Acquisition Proposal") or engage in any discussions or negotiations concerning,
or provide any confidential or non-public information or data to, or have any
discussions with, any person relating to an Acquisition Proposal, or otherwise
facilitate any effort or attempt to make or implement an Acquisition Proposal,
provided that nothing in the Agreement prohibits the Beacon Board (including
with respect to Beacon's capacity as general partner of Beacon Partnership) from
(i) furnishing information to or entering into discussions or negotiations with,
any person or entity that makes an unsolicited Acquisition Proposal, if, and
only to the extent that (A) a majority of the members of the Beacon Board
determines in good faith, based upon the advice of outside counsel, that such
action is required for the Beacon Board to comply with its duties to
shareholders imposed by applicable law and (B) prior to furnishing such
information to, or entering into discussions or negotiations with, such person
or entity, Beacon provides written notice to EOP to the effect that it is
furnishing information to, or entering
 
                                       55
<PAGE>   64
 
into discussions with, such person or entity and (ii) making any disclosure
required by applicable law with regard to an Acquisition Proposal. The foregoing
provision is not to be construed to (i) permit Beacon to terminate the Agreement
(except as specifically described in "-- Termination Extension, Amendment and
Waiver"), (ii) permit Beacon to enter into an agreement for an Acquisition
Proposal during the term of the Agreement or (iii) affect any other obligation
of Beacon under the Agreement; provided, however, that a majority of the members
of the Beacon Board may approve and recommend a Superior Acquisition Proposal
(as defined below) and, in connection therewith, withdraw or modify its approval
or recommendation of the Agreement and the Mergers if such majority determines
in good faith, based upon the advice of outside counsel, that such action is
required for the Beacon Board to comply with its duties to shareholders imposed
by applicable law. "Superior Acquisition Proposal" means a bona fide Acquisition
Proposal made by a third party which a majority of the members of the Beacon
Board resolves in good faith to be in the best interests of and more favorable
to the Beacon Shareholders than the Mergers and which the Beacon Board
determines is reasonably capable of being consummated.
 
CERTAIN OTHER COVENANTS
 
     Under the Agreement, the parties have agreed as follows: (i) to use all
reasonable best efforts to cooperate with one another in (A) determining which
filings are required to be made prior to the Effective Time with, and which
consents, approvals, permits or authorizations are required to be obtained prior
to the Effective Time from, governmental or regulatory authorities of the United
States, the several states and foreign jurisdictions and any third parties in
connection with the execution and delivery of the Agreement, and the
consummation of the transactions contemplated thereby and (B) timely making all
such filings and timely seeking all such consents, approvals, permits and
authorizations; (ii) to use all reasonable best efforts (other than the payment
of money) to obtain in writing any consents required from third parties to
effectuate the Mergers, such consents to be in form reasonably satisfactory to
each of the parties; (iii) to use all reasonable best efforts to take, or cause
to be taken, all other action and do, or cause to be done, all other things
necessary, proper or appropriate to consummate and make effective the
transactions contemplated by the Agreement; (iv) to refrain from, and use
commercially reasonable efforts to cause each of their respective Subsidiaries
and joint ventures to refrain from, taking any action that would result in (A)
any of the representations and warranties of such party set forth in the
Agreement that are qualified as to materiality becoming untrue, (B) any of such
representations and warranties that are not so qualified becoming untrue in any
material respect or (C) except as contemplated with respect to a Superior
Acquisition Proposal, any of the conditions to the Mergers not being satisfied;
(v) subject to the requirements of confidentiality agreements with third
parties, to afford, and to cause each of their respective Subsidiaries to
afford, to the other parties and to the officers, employees, accountants,
counsel, financial advisors and other representatives of such other parties,
reasonable access during normal business hours prior to the Effective Time to
all their respective properties, books, contracts, commitments, personnel and
records and, during such period, to furnish, and to cause each of their
respective Subsidiaries to furnish, promptly to the other parties (A) a copy of
each report, schedule, registration statement and other document filed by it
during such period pursuant to the requirements of federal or state securities
laws and (B) all other information concerning its business, properties and
personnel as such other party may reasonably request and to use, and to cause
each of their respective Subsidiaries to use, commercially reasonable efforts to
cause its officers, employees, accountants, counsel, financial advisors and
other representatives and affiliates to, hold any nonpublic information in
confidence; (vi) to use reasonable best efforts to cause the Company Merger to
qualify as a reorganization under the provisions of Section 368(a) of the Code
and to obtain the opinions of counsel described in "FEDERAL INCOME TAX
CONSIDERATIONS;" (vii) if, based upon the advice of counsel, EOP and Beacon
determine that the Partnership Merger could reasonably be expected to create a
risk that the Company Merger would not qualify as a reorganization under the
provisions of Section 368(a) of the Code, to use reasonable best efforts to
negotiate and structure an alternative means to effect the Partnership Merger,
for EOP to acquire the interest in Beacon Partnership owned by Beacon, and for
the holders of Beacon Partnership Units to receive EOP Partnership Units (or the
economic and tax equivalent thereof) in exchange for their Beacon Partnership
Units; (viii) to cooperate in the preparation, execution and filing of all
returns, questionnaires, applications or other documents regarding any real
property transfer or gains, sales, use transfer, value added stock transfer
 
                                       56
<PAGE>   65
 
and stamp taxes, any transfer, recording, registration and other fees and any
similar taxes payable in connection with the transactions contemplated by the
Agreement; and (ix) to consult with each other party before issuing, and provide
each other party the opportunity to review and comment upon, any press release
or other written public statements which address in any manner the transactions
contemplated by the Agreement, and to refrain from issuing any such press
release or making any such written public statement prior to such consultation,
except as may be required by applicable law, court process or by obligations
pursuant to any listing agreement with any national securities exchange.
 
     Beacon has also agreed that (i) it will request written consents for
approval by the Beacon Unitholders of the Mergers to the extent required by the
Beacon Partnership Agreement and any other matters reasonably requested by
either party to effectuate the transactions contemplated by the Agreement and it
will vote in favor of such matters and recommend to the Beacon Unitholders that
they approve such matters; (ii) it will cause the directors and officers of each
of the Beacon Subsidiaries to submit their resignations from such positions,
effective as of the Effective Time and (iii) it will not, and will not permit
any of its Subsidiaries to, amend the management agreements pursuant to which
Beacon, directly or indirectly, manages buildings in which Beacon does not own a
100% interest and it will not, and will not permit any Beacon Subsidiary to,
renew such management agreements except on terms which permit their cancellation
by Beacon or the applicable Beacon Subsidiary on thirty days' notice or less
without any charge, penalty or other cost for such cancellation. Beacon and
Beacon Partnership have agreed to use all reasonable best efforts to obtain from
Coopers & Lybrand L.L.P., access to all work papers relating to audits of Beacon
and Beacon Partnership performed by Coopers & Lybrand L.L.P. and the continued
cooperation of Coopers & Lybrand L.L.P. with regard to the preparation of
consolidated financial statements for EOP after the Effective Time.
 
     EOP has also agreed that (i) it will seek the requisite approval of the EOP
Unitholders to the Partnership Merger to the extent required by the EOP
Partnership Agreement and any other matters reasonably requested by either party
to effectuate the transactions contemplated by the Agreement and (ii) it will
use all reasonable best efforts to cause the EOP Common Shares and the EOP
Preferred Shares to be issued in the Merger and the EOP Common Shares reserved
for issuance upon redemption of EOP Partnership Units issued in the Partnership
Merger, to be approved for listing on the NYSE, subject to official notice of
issuance, prior to the Effective Time and (iii) from and after the Effective
Time, it will pay or cause EOP Partnership to pay or cause to be paid, without
deduction or withholding from any amounts payable to the holders of EOP Common
Shares, EOP Preferred Shares or EOP Partnerships Units, as applicable, all
transfers and gains taxes (which term does not include taxes imposed under the
Code or comparable provisions of state law). EOP and EOP Partnership have agreed
that they shall assume the obligations of Beacon, Beacon Partnership or the
applicable Beacon Subsidiary, as the case may be, under each agreement specified
in the Agreement (i) that has as one of its purposes to permit a person or
entity to take the position that such person or entity could defer federal
taxable income that otherwise might have been recognized upon a transfer of
property to Beacon Partnership or any other Beacon Subsidiary that is treated as
a partnership for federal income tax purposes, and (ii) that (A) prohibits or
restricts in any manner the disposition of any assets of Beacon or any Beacon
Subsidiary, (B) requires that Beacon or any Beacon Subsidiary maintain, or put
in place, or replace, indebtedness, whether or not secured by one or more of the
Beacon Properties, or (C) requires that Beacon or any Beacon Subsidiary offer to
any person or entity at any time the opportunity to guarantee or otherwise
assume, directly or indirectly, the risk of loss for federal income tax purposes
for indebtedness or other liabilities of Beacon or any Beacon Subsidiary.
 
TERMINATION, EXTENSION, AMENDMENT AND WAIVER
 
     The Agreement may be terminated at any time prior to the filing of the
articles of merger with the Department, whether before or after the approval
thereof by the EOP Shareholders, Beacon Shareholders or the Beacon Unitholders,
under the circumstances specified therein, including: (i) by mutual written
consent duly authorized by the EOP Board and the Beacon Board; (ii) by EOP, upon
a breach of any representation, warranty, covenant, obligation or agreement of
Beacon or Beacon Partnership set forth in the Agreement, or if any
representation or warranty of Beacon or Beacon Partnership in the Agreement
shall become untrue, in either case such that the conditions to EOP's obligation
to close relating to such representations, warranties,
 
                                       57
<PAGE>   66
 
covenants, obligations and agreements would be incapable of being satisfied by
April 15, 1998 (or as otherwise extended); (iii) by Beacon, upon a breach of any
representation, warranty, covenant, obligation or agreement of EOP or EOP
Partnership set forth in the Agreement, or if any representation or warranty of
EOP or EOP Partnership shall become untrue, in either case such that the
conditions to Beacon's obligation to close relating to such representations,
warranties, covenants, obligations and agreements would be incapable of being
satisfied by April 15, 1998 (or as otherwise extended); (iv) by either EOP or
Beacon, if any judgment, injunction, order, decree or action by any governmental
entity of competent authority preventing the consummation of the Merger shall
have become final and non-appealable; (v) by either EOP or Beacon, if the Merger
shall not have been consummated before April 15, 1998 (or as otherwise
extended); provided, however, that a party may not terminate the Agreement for
the reasons referred to in this clause (v) if it shall have breached in any
material respect its obligations under the Agreement in any manner that shall
have proximately contributed to the occurrence of the failure referred to in
this clause (v); (vi) by either EOP or Beacon (unless Beacon or Beacon
Partnership is in breach of its obligations under the Agreement with respect to
the preparation and mailing of this Proxy Statement/Prospectus, the holding of
the Beacon Special Meeting or the approval of the Mergers and other matters by
the Beacon Shareholders and the Beacon Unitholders), if, upon a vote at a duly
held Beacon Special Meeting or any adjournment thereof, the requisite approval
of the Merger by the Beacon Shareholders shall not have been obtained; (vii) by
either Beacon or EOP (unless EOP or EOP Partnership is in breach of its
obligations under the Agreement with respect to the preparation and mailing of
this Proxy Statement/Prospectus or the holding of the EOP Special Meeting), if,
upon a vote at a duly held EOP Special Meeting or any adjournment thereof, the
requisite approval of the Company Merger by the EOP Shareholders shall not have
been obtained; (viii) by Beacon, if prior to the Beacon Special Meeting, the
Beacon Board shall have withdrawn or modified in any manner adverse to EOP its
approval or recommendation of the Mergers or the Agreement in connection with,
or approved or recommended, a Superior Acquisition Proposal; provided, however,
that such termination will not be effective prior to the payment of the Break-Up
Fee (as defined below); (ix) by EOP, if (A) prior to the Beacon Special Meeting,
the Beacon Board shall have withdrawn or modified in any manner adverse to EOP
its approval or recommendation of the Mergers or the Agreement in connection
with, or approved or recommended, any Superior Acquisition Proposal, (B) Beacon
shall have entered into any agreement for any Acquisition Proposal, or (C) the
Beacon Board or any committee thereof shall have resolved to do any of the
foregoing; and (x) by Beacon, if the average of the closing prices of the EOP
Common Shares on the NYSE for all trading days during the period of twenty (20)
consecutive trading days commencing on the twenty-seventh (27th) trading day
prior to the date of the Beacon Special Meeting is less than $27.39.
 
     The foregoing provisions are subject to the agreement of the parties that,
in the event of any preliminary, temporary or other nonfinal judgment,
injunction, order, decree or action by any court (each an "Action") preventing,
delaying or otherwise materially adversely affecting the consummation of either
of the Mergers primarily resulting from any action or inaction of Beacon, EOP
has the right, in its sole and absolute discretion, by giving written notice to
Beacon, to preclude Beacon (for one or more periods aggregating not more than
six (6) months) from terminating the Agreement pursuant to the provisions
described in clause (v) or (viii) of the preceding paragraph (unless, in the
case of provisions described in clause (viii), the Beacon Board shall have acted
in the circumstances described in clause (viii) without basing its decision in
any way, directly or indirectly, on the Action), for the period of such
prevention, delay or material adverse effect plus fifteen (15) days, in which
event each of the dates referred to in the provisions described in clauses (ii)
and (v) of the preceding paragraph and the date by which EOP must hold the EOP
Special Meeting pursuant to the Agreement shall be extended for each such
period.
 
     In the event of termination of the Agreement, no party to the Agreement
will have any liability or further obligation under the Agreement, other than
with respect to the obligations of the parties described in "-- Fees and
Expenses," provisions of the Agreement dealing with confidentiality and certain
miscellaneous provisions, except that nothing in the Agreement will relieve any
party from liability for any material breach by such party of any of its
representations, warranties, covenants or agreements set forth in the Agreement.
 
     The parties to the Agreement may not amend the Agreement except by an
instrument in writing signed on behalf of all the parties and duly approved by
the EOP Board and the Beacon Board. The Agreement may
 
                                       58
<PAGE>   67
 
be so amended at any time before or after any shareholder approvals thereof are
obtained and prior to the filing of the articles of merger with the Department
but, after such shareholder approvals and any required partner approvals are
obtained, no such amendment, modification or supplement shall be made which by
law requires the further approval of shareholders or unitholders without
obtaining such further approval. The parties to the Agreement have agreed to
amend the Agreement to the extent required to (i) continue the status of each
party as a REIT or (ii) preserve the Company Merger as a tax-free reorganization
under Section 368 of the Code.
 
     At any time prior to the Effective Time, the parties to the Agreement may
(i) extend the time for the performance of any of the obligations or other acts
of the other parties, (ii) waive any inaccuracies in the representations and
warranties of the other parties contained in the Agreement or in any document
delivered pursuant to the Agreement or (iii) waive compliance with any of the
agreements or conditions of the other party contained in the Agreement, provided
that, after any shareholder approvals and any required partner approvals are
obtained, no such waiver will be made which by law requires the further approval
of shareholders without obtaining such further approval. Any agreement on the
part of a party to any such extension or waiver must be in writing to be valid.
The failure of any party to the Agreement to assert any of its rights under the
Agreement or otherwise shall not constitute a waiver of those rights.
 
FEES AND EXPENSES
 
     Except as described below, each party shall bear its own fees and expenses
in connection with the transactions contemplated by the Agreement.
 
     Beacon and Beacon Partnership are obligated to pay EOP Partnership a fee (a
"Break-Up Fee") equal to the lesser of (A) $75 million less any EOP Break-Up
Expenses (as defined below) paid or payable by Beacon and Beacon Partnership and
(B) the maximum amount which EOP Partnership can receive without causing EOP to
be disqualified as a REIT under the Code, under the following circumstances:
 
          (i) if the Agreement is terminated by Beacon as a result of the Beacon
     Board having, prior to the Beacon Special Meeting, withdrawn or modified in
     any manner adverse to EOP its approval or recommendation of the Mergers or
     the Agreement in connection with, or approved or recommended, a Superior
     Acquisition Proposal, provided, however, that Beacon and Beacon Partnership
     will have no obligation to pay the Break-Up Fee if, at the time of such
     termination of the Agreement, Beacon was also entitled to terminate the
     Agreement as a result of a breach of any representation, warranty, covenant
     obligation or agreement on the part of EOP or EOP Partnership;
 
          (ii) if the Agreement is terminated by EOP as a result of (A) the
     Beacon Board having, prior to the Beacon Special Meeting, withdrawn or
     modified in any manner adverse to EOP its approval or recommendation of the
     Mergers or the Agreement in connection with, or having approved or
     recommended, any Superior Acquisition Proposal, (B) Beacon having entered
     into any agreement for any Acquisition Proposal, or (C) the Beacon Board or
     any committee thereof having resolved to do any of the foregoing, provided,
     however, that Beacon and Beacon Partnership will have no obligation to pay
     the Break-Up Fee if, at the time of such termination of the Agreement,
     Beacon was also entitled to terminate the Agreement as a result of a breach
     of any representation, warranty, covenant, obligation or agreement on the
     part of EOP or EOP Partnership;
 
          (iii) if the Agreement is terminated as a result of (A) a breach of
     any representation, warranty, covenant obligation or agreement on the part
     of Beacon or Beacon Partnership, (B) the existence of a final and
     non-appealable judgment, injunction, order, decree or action by any
     governmental entity of competent authority preventing the consummation of
     the Merger (if primarily resulting from any action or inaction of Beacon or
     any Beacon Subsidiary), (C) the Merger not being consummated before April
     15, 1998 (or as otherwise extended), (D) the failure of the Merger to be
     approved by the requisite vote at the Beacon Special Meeting or any
     adjournment thereof or (E) the average of the closing prices of the EOP
     Common Shares on the NYSE for all trading days during the period of 20
     consecutive trading days commencing on the 27th trading day prior to the
     date of the Beacon Special Meeting having been less than $27.39, and, prior
     to the time of such termination, an Acquisition Proposal has been
 
                                       59
<PAGE>   68
 
     received by Beacon or any Beacon Subsidiary, and either prior to the
     termination of the Agreement or within 12 months thereafter, Beacon or any
     Beacon Subsidiary enters into any written Acquisition Proposal which is
     subsequently consummated (whether or not any such Acquisition Proposal is
     the same Acquisition Proposal which had been received at the time of the
     termination of the Agreement);
 
          (iv) if, prior to the Beacon Special Meeting, the Beacon Board shall
     have withdrawn or modified in any manner adverse to EOP its approval or
     recommendation of the Mergers or the Agreement and, within 12 months after
     termination of the Agreement, Beacon or Beacon Partnership enters into any
     written Acquisition Proposal which is subsequently consummated (whether or
     not any Acquisition Proposal had been received prior to the time of the
     termination of the Agreement); or
 
          (v) if the Agreement shall be terminated as a result of the average of
     the closing prices of the EOP Common Shares on the NYSE for all trading
     days during the period of 20 consecutive trading days commencing on the
     27th trading day prior to the date of the Beacon Special Meeting having
     been less than $27.39 and, within six months thereafter, Beacon or any
     Beacon Subsidiary enters into any written Acquisition Proposal which is
     subsequently consummated (whether or not any Acquisition Proposal had been
     received at the time of the termination of the Agreement).
 
     Beacon and Beacon Partnership are obligated to pay EOP Partnership an
amount ("EOP Break-Up Expenses") equal to the lesser of (A) $10 million, (B) EOP
Partnership's out-of-pocket expenses incurred in connection with the Agreement
and the transactions contemplated thereby (including, without limitation, all
attorneys', accountants' and investment bankers' fees and expenses) and (C) the
maximum amount which EOP Partnership can receive without causing it to be
disqualified as a REIT under the Code, under the following circumstances,
unless, at the time of termination of the Agreement, Beacon was also entitled to
terminate the Agreement as a result of a breach of any representation, warranty,
covenant obligation or agreement on the part of EOP or EOP Partnership:
 
          (i) if the Agreement is terminated by EOP as a result of a breach of
     any representation, warranty, covenant obligation or agreement on the part
     of Beacon or Beacon Partnership; or
 
          (ii) if the Agreement is terminated by EOP or Beacon as a result of
     the failure of the Merger to be approved by the requisite vote at the
     Beacon Special Meeting or any adjournment thereof.
 
     EOP and EOP Partnership are obligated to pay Beacon Partnership an amount
("Beacon Break-Up Expenses") equal to the lesser of (A) $10 million, (B) Beacon
Partnership's out-of-pocket expenses incurred in connection with the Agreement
and the transactions contemplated thereby (including, without limitation, all
attorneys', accountants' and investment bankers' fees and expenses) and (C) the
maximum amount which Beacon Partnership can receive without causing it to be
disqualified as a REIT under the Code, under the following circumstances,
unless, at the time of termination of the Agreement, EOP was also entitled to
terminate the Agreement as a result of a breach of any representation, warranty,
covenant obligation or agreement on the part of Beacon or Beacon Partnership:
 
          (i) if the Agreement is terminated by Beacon as a result of a breach
     of any representation, warranty, covenant obligation or agreement on the
     part of EOP or EOP Partnership; or
 
          (ii) if the Agreement is terminated by EOP or Beacon as a result of
     the failure of the Merger to be approved by the requisite vote at the EOP
     Special Meeting or any adjournment thereof.
 
ASSUMPTION OF BEACON'S OBLIGATIONS UNDER REGISTRATION RIGHTS AGREEMENTS
 
     Pursuant to the Agreement, EOP has agreed to assume Beacon's obligations
under existing registration rights agreements (the "Registration Rights
Agreements") between Beacon and certain holders of Beacon Partnership Units (the
"Registration Rights Holders"). Pursuant to the Registration Rights Agreements,
Beacon has agreed that, upon the request of the Registration Rights Holders, it
will file registration statements, in most cases under Rule 415 under the
Securities Act, for the sale of Beacon Common Shares which may be issued to the
Registration Rights Holders at the option of Beacon upon the redemption of their
 
                                       60
<PAGE>   69
 
Beacon Partnership Units and, in most cases, to cause such registration
statements to remain effective for six months. The Registration Rights Holders,
under each Registration Rights Agreement, cannot request that registration
statements be filed more than once in any 12-month period. The obligations of
Beacon to file such registration statements expire between 2002 and 2015 or, if
earlier, the date on which the Beacon Common Shares which are subject thereto
may be sold pursuant to Rule 144 under the Securities Act. Under certain of the
Registration Rights Agreements, Beacon is not required to file more than two
such registration statements.
 
     The Registration Rights Agreements also grant the Registration Rights
Holders the right, with certain exceptions, to register such number of their
Beacon Common Shares which are subject to such agreements as to which they
notify Beacon within 15 days following their receipt of notice of a proposed
offering from Beacon on any registration statement filed by Beacon for an
offering of Beacon Common Shares solely for cash. In the event that marketing
constraints prevent the registration of all Beacon Common Shares requested to be
registered, such shares shall be registered, to the extent marketable, on a pro
rata basis.
 
     As of November 12, 1997, Registration Rights Agreements were in effect with
respect to Beacon Common Shares issuable upon conversion of 6,938,900 Beacon
Partnership Units then outstanding. Such Beacon Partnership Units will be
converted into 9,758,175 EOP Partnership Units in connection with the
Partnership Merger and the 9,758,175 EOP Common Shares issuable upon conversion
thereof will be subject to the Registration Rights Agreements.
 
     EOP has registered the issuance of the EOP Common Shares to be issued upon
the redemption of the EOP Partnership Units received by holders of Beacon
Partnership Units in the Merger. If EOP is unable to issue EOP Common Shares
pursuant to a registration statement at the time of a redemption of EOP
Partnership Units by a holder of Beacon Partnership Units, EOP has agreed to
cause EOP Partnership to redeem such EOP Partnership Units for cash.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGERS
 
     Certain directors, executives and employees of Beacon and its affiliates
have certain interests in the Mergers that are different from, or in addition
to, the interests generally of the Beacon Shareholders, the Beacon Unitholders
and the EOP Shareholders. Such interests are described below. The Beacon Board
was aware of these interests at the time that it approved the Mergers and the
Agreement and considered them, among other matters, in approving the Agreement
and the transactions contemplated thereby.
 
     BEACON STOCK OPTIONS.  As of November 12, 1997, Beacon had granted to its
executive officers options to purchase a total of 2,418,333 Beacon Common Shares
as follows: 630,000 to Mr. Leventhal, 385,000 to Mr. Fortin, 300,000 to Mr.
Cremens, 200,000 to each of Messrs. Fletcher, Perriello and Wheeler, 190,000 to
Mr. Mitchell, 150,000 to Mr. Brooks, 100,000 to Ms. Judson and 63,333 to Mr.
Irwig. As of November 12, 1997, options to purchase a total of 343,336 Beacon
Common Shares were vested as follows: 116,667 for Mr. Leventhal, 61,667 for Mr.
Fortin, 58,334 for Mr. Perriello, 50,000 for Mr. Cremens, 48,334 for Mr.
Mitchell and 8,334 for Ms. Judson. According to the terms of such options, all
options which currently are not vested will become fully vested and immediately
exercisable in connection with the Merger. See "-- Exchange Ratios and Exchange
of EOP Common Shares, EOP Preferred Shares and EOP Partnership Units." In the
event the executive officers exercise the options to purchase 2,418,333 Beacon
Common Shares, the aggregate value (net of the exercise price and assuming a
price of $41 11/16 per Beacon Common Share) (the closing price of the Beacon
Common Shares on November 12, 1997)) for such options would be $34,735,305,
including $9,336,875 for the options of Mr. Leventhal, $5,607,813 for the
options of Mr. Fortin, $4,693,750 for the options of Mr. Cremens, $3,281,250 for
the options of Mr. Perriello, $2,371,875 for the options of Mr. Brooks,
$3,034,375 for the options of Mr. Mitchell, $2,037,000 for the options of each
of Messrs. Fletcher and Wheeler, $1,443,750 for the options of Ms. Judson, and
$890,618 for the options of Mr. Irwig.
 
     SENIOR EXECUTIVE SEVERANCE AGREEMENTS.  Effective as of July 31, 1997,
Beacon entered into individual Senior Executive Severance Agreements with each
of Alan Leventhal, President, Chief Executive Officer and Director of Beacon and
Lionel Fortin, Executive Vice President, Chief Operating Officer and Director of
Beacon. Both of the Senior Executive Severance Agreements provide that, if
following a "change in control"
 
                                       61
<PAGE>   70
 
(as defined in the Senior Executive Severance Agreement), the respective officer
experiences a Terminating Event (as defined in the Senior Executive Severance
Agreement) within 36 months of the change in control, he will be entitled to
receive three times (i) the amount of the officer's current base salary,
determined prior to any reduction for pre-tax contributions to a cash deferred
arrangement or a cafeteria plan, (ii) the amount of the highest potential cash
bonus that could be earned by the officer in the year of the change of control,
and (iii) the amount of the value at the time of the change of control of any
restricted stock granted by Beacon to the officer which vested in the calendar
year immediately prior to the change in control (collectively, the "Severance
Payments"). Such amount is payable in one lump sum no later than 31 days after
the date of such Terminating Event. Additionally, upon the effective date of the
change in control, regardless of whether a Terminating Event has occurred, the
officer will receive an amount in cash representing the officer's share of the
performance pool under Beacon's Extraordinary Performance Stock Incentive Plan
for Senior Executives as a result of the change in control (the "Performance
Payment"). Further, in the event the Severance Payments and Performance Payments
would be subject to an excise tax imposed by Section 4999 of the Code (any such
tax, together with any interest or penalties, the "Excise Tax"), the officer
will be entitled to an additional payment (the "Gross-Up Payment") such that the
net amount retained by the officer after payment of the Excise Tax and the
income taxes due as a result of receipt of the Gross-Up Payment will equal the
Severance Payments and Performance Payments. As of November 12, 1997, the
Severance Payments that would be made pursuant to the Senior Executive Severance
Agreements would be approximately $2.4 million to Mr. Leventhal and
approximately $1.8 million to Mr. Fortin. Additionally the Performance Payment
that would be made pursuant to the Senior Executive Severance Agreements would
be approximately $12.8 million to Mr. Leventhal and approximately $8.1 million
to Mr. Fortin. Under the terms of the Senior Executive Severance Agreements, the
amount of any Gross-Up Payment will be determined by Coopers & Lybrand L.L.P.,
or another nationally-recognized accounting firm, within 15 business days of the
termination date. The Gross-Up Payments under the Senior Executive Severance
Agreements are currently estimated to be approximately $8.0 million to Mr.
Leventhal and approximately $5.2 million for Mr. Fortin. The final amount of any
Gross-Up Payments may be subject to further adjustment. In addition to the
payments described above, the officers are also entitled to (i) continued
health, dental, long-term disability, life insurance and other fringe benefits
for 36 months, (ii) COBRA benefits following the period referred to in clause
(i) of this sentence, and (iii) all reasonable legal and mediation fees and
expenses incurred in obtaining or enforcing any right or benefit under the
Senior Executive Severance Agreements.
 
     EXECUTIVE SEVERANCE PLAN.  Effective as of July 31, 1997, Beacon adopted an
Executive Severance Plan that applies to the Senior Vice Presidents of Beacon
Properties Corporation. The Executive Severance Plan provides, if following a
change in control (as defined in the Executive Severance Plan), a covered
officer experiences a Terminating Event (as defined in the Executive Severance
Plan) within 24 months of the change in control, he or she will be entitled to
receive two times (i) the amount of the officer's current base salary,
determined prior to any reduction for pretax contributions to a cash deferred
arrangement or a cafeteria plan, (ii) the amount of the highest potential cash
bonus that could be earned by the covered officer in the year of the change of
control, and (iii) the amount of the value at the time of the change of control
of any restricted stock granted by Beacon to the covered officer which vested in
the calendar year immediately prior to the change in control (collectively, the
"Severance Payments"). Such amount is payable in one lump sum no later than 31
days after the date of such Terminating Event. Additionally, upon the effective
date of the change in control, regardless of whether a Terminating Event has
occurred, the officer will receive an amount in cash representing the officer's
share of the performance pool under Beacon's Extraordinary Performance Stock
Incentive Plan for Senior Executives as a result of the change in control (the
"Performance Payment"). Further, in the event the Severance Payments and the
Performance Payment would be subject to an Excise Tax, an officer with at least
five years of service will be entitled to a Gross-Up Payment such that the net
amount retained by the officer after deduction of the Excise Tax and the income
taxes due as a result of receipt of the Gross-Up Payment will equal the
Severance Payments and the Performance Payment. As of November 12, 1997, the
Severance Payments that would be made pursuant to the Executive Severance Plan
would be approximately $750,000 to Mr. Mitchell, $700,000 to Mr. Perriello,
$557,600 to Ms. Judson, $800,000 to Mr. Cremens, $700,000 to Mr. Brooks,
$740,000 to each of Mr. Fletcher and Mr. Wheeler and $507,000 to Mr. Irwig.
Additionally, the Performance Payment that would be made pursuant to the
Executive
 
                                       62
<PAGE>   71
 
Severance Plan would be approximately $3.9 million to each of Messrs. Mitchell
and Perriello, approximately $1.1 million to Mr. Cremens, approximately $1.2
million to Ms. Judson and approximately $312,000 to Mr. Brooks. Under the terms
of the Executive Severance Plan, the amount of the Gross-Up Payments due to
qualifying officers (each of Mr. Mitchell, Mr. Perriello and Ms. Judson) will be
determined by Coopers & Lybrand L.L.P., or another nationally recognized
accounting firm within 15 business days of the termination date. The Gross-Up
Payments under the Executive Severance Plan are currently estimated to be
approximately $2.3 million for each of Messrs. Mitchell and Perriello and
$995,000 for Ms. Judson. The final amount of any Gross-Up Payment may be subject
to further adjustments. In addition to the payments described above, the
officers are also entitled to (i) continued health, dental, long-term
disability, life insurance and other fringe benefits for 24 months; (ii) COBRA
benefits following the period referred to in clause (i) of this sentence, and
(iii) all reasonable legal and mediation fees and expenses incurred in obtaining
or enforcing any right or benefit under the Executive Severance Plan.
 
     SPECIAL TERMINATION PLAN.  Effective as of July 31, 1997, Beacon adopted a
Special Termination Plan that applies to all employees with the title of either
Vice President or General Counsel of Beacon and all employees with the title of
Senior Vice President or Vice President of a Subsidiary or affiliate of Beacon.
The Special Termination Plan provides, if following a "change of control" (as
defined in the Special Termination Plan), a covered officer experiences a
Terminating Event (as defined in the Special Termination Plan) within 12 months
of the change in control, he or she will be entitled to receive (i) an amount
equal to the officer's current base salary, determined prior to any reduction
for pre-tax contributions to a cash deferred arrangement or a cafeteria plan,
(ii) an amount equal to the highest potential cash bonus that could earned by
the covered officer in the year of the change of control, and (iii) an amount
equal to the value at the time of the change of control of any restricted stock
granted by Beacon to the covered officer which vested in the calendar year
immediately prior to the change in control. Such amount is payable in one lump
sum no later than 31 days after the date of such covered officer's termination.
As of November 12, 1997, the payments that would be made pursuant to the Special
Termination Plan to all covered officers would be approximately $5.5 million. In
addition to the payments described above, the officers are also entitled to (i)
continued health, dental, longterm disability, life insurance and other fringe
benefits for 12 months and (ii) COBRA benefits following the period referred to
in clause (i) of this sentence.
 
     CERTAIN AGREEMENTS RESTRICTING THE SALE OR REFINANCING OF CERTAIN BEACON
PROPERTIES.  The Agreement also provides that, prior to the closing of the
transactions thereunder, EOP and EOP Partnership will enter into agreements
pursuant to which EOP and EOP Partnership will agree, for a period of ten years
(subject to one ten-year extension option, at the election of the beneficiaries
upon payment of $250,000), to certain restrictions on the sale of the properties
located at One Post Office Square and Center Plaza in Boston, Massachusetts and
to certain requirements regarding the incurrence, maintenance or refinancing of
indebtedness with respect to such properties (or, alternatively, to pay to the
beneficiaries of such agreements the aggregate federal, state and local income
taxes (plus a full gross-up for any taxes that would be imposed on the
beneficiaries as the result of receipt of any such payments) payable by such
beneficiaries in the event EOP does not comply with such restrictions or
requirements). The purpose of such agreements is to permit certain persons and
entities, including Messrs. Sidman, Alan M. Leventhal, Norman Leventhal, Fortin,
Perriello and Mitchell, certain members of the families of Messrs. Sidman and
Leventhal and certain entities in which one or more of the foregoing persons
hold beneficial interests, who were the beneficial owners of entities that
transferred such properties to Beacon Partnership (or a Beacon Subsidiary) at
the time of the Beacon Initial Offering, to continue to defer federal taxable
income that otherwise might have been recognized upon such transfers or might be
recognized as a result of a subsequent transaction.
 
     INDEMNIFICATION.  Pursuant to the Agreement, EOP has agreed to provide,
from and after the Effective Time, exculpation and indemnification for each
person who is now or has been at any time prior to the date of the Agreement, or
who becomes prior to the Effective Time, an officer or director of Beacon or any
Beacon Subsidiary (the "Indemnified Parties") to the same extent as provided to
them by Beacon and the Beacon Subsidiaries immediately prior to the Effective
Time in their respective charters, bylaws, partnership, operating or similar
agreement, provided, however, that such exculpation and indemnification covers
actions
 
                                       63
<PAGE>   72
 
on or prior to the Effective Time, including, without limitation, all
transactions contemplated by the Agreement.
 
     In addition, the Agreement provides that EOP and EOP Partnership shall
indemnify and hold harmless, as and to the full extent permitted by applicable
law, each Indemnified Party against any losses, claims, liabilities, expenses
(including reasonable attorneys' fees and expenses), judgments, fines and
amounts paid in settlement in connection with any threatened or actual claim,
action, suit, proceeding or investigation, whether civil, criminal or
administrative, including without limitation, any action by or on behalf of any
or all securityholders of Beacon or EOP, or any Beacon Subsidiary or EOP
Subsidiary, or by or in the right of Beacon or EOP, or any Beacon Subsidiary or
EOP Subsidiary, in which such Indemnified Party is, or is threatened to be, made
a party based in whole or in part on, or arising in whole or in part out of, or
pertaining to (i) the fact that he is or was an officer, employee or director of
Beacon or any of the Beacon Subsidiaries or any action or omission by such
person in his capacity as a director, or (ii) the Agreement or the transactions
contemplated thereby, whether in any case asserted or arising before or after
the Effective Time. After the Effective Time, EOP and EOP Partnership shall be
obligated to promptly pay and advance reasonable expenses and costs incurred by
such Indemnified Person as they become due and payable in advance of the final
disposition of the claim, action, suit, proceeding or investigation to the
fullest extent and in the manner permitted by law.
 
     EOP is also obligated to purchase, at or prior to the Effective Time,
directors' liability insurance policy coverage for Beacon's directors and
executive officers for a period of six years which will provide the directors
and officers with coverage on substantially similar terms as currently provided
by Beacon to such directors and officers.
 
     REGISTRATION RIGHTS.  Certain directors and officers of Beacon and other
Beacon affiliates hold, in the aggregate, 2,778,981 Beacon Partnership Units
which are redeemable for cash, or, at the option of Beacon, for Beacon Common
Shares on a one-for-one basis which are subject to certain of the Registration
Rights Agreements. See "-- Assumption of Beacon's Obligations Under Registration
Rights Agreements."
 
ANTICIPATED ACCOUNTING TREATMENT
 
     The Mergers will be accounted for using the purchase method in accordance
with Accounting Principles Board Opinion No. 16.
 
RESALES OF EOP PARTNERSHIP UNITS, EOP COMMON SHARES AND EOP PREFERRED SHARES
 
     The EOP Partnership Units to be issued to the holders of Beacon Partnership
Units in the Partnership Merger will be transferable subject to the restrictions
contained in the EOP Partnership Agreement as described under "EOP PARTNERSHIP
AGREEMENT AND UNITS OF PARTNERSHIP INTEREST -- Transfer or Pledge of Partnership
Interests." The EOP Common Shares and the EOP Preferred Shares to be issued to
holders of the Beacon Common Shares and the Beacon Preferred Shares,
respectively, upon consummation of the Company Merger and the EOP Common Shares
reserved for issuance upon redemption of EOP Partnership Units to be issued to
holders of Beacon Partnership Units upon consummation of the Partnership Merger
have been registered under the Securities Act, and will be transferable freely
and without restriction by those holders of Beacon Common Shares, Beacon
Preferred Shares and Beacon Partnership Units who receive such shares following
the consummation of the Mergers or upon redemption of the EOP Partnership Units
issued pursuant thereto and who are not deemed to be "affiliates" (as defined
under Rule 145 of the Securities Act, and generally including trustees,
directors, certain executive officers and ten percent or more shareholders) (the
"Affiliates") of EOP or Beacon. Rule 145, among other things, imposes certain
restrictions upon the resale of securities received by affiliates in connection
with certain reclassifications, mergers, consolidations or asset transfers. EOP
Common Shares received by Affiliates of Beacon in the Company Merger or upon
redemption of EOP Partnership Units received by such persons in the Partnership
Merger will be subject to the applicable resale limitations of Rule 145.
 
     Beacon has agreed that, prior to the Effective Time, it shall cause to be
prepared and delivered to EOP a list identifying all persons who, at the time of
the Shareholders Meetings, may be deemed to be Affiliates of
 
                                       64
<PAGE>   73
 
Beacon. Beacon has agreed to use its reasonable best efforts to cause each
person who is identified as an Affiliate to deliver to EOP, on or prior to the
Effective Time, a written agreement, in a form approved by the parties to the
Agreement, that such Affiliate will not sell, pledge, transfer or otherwise
dispose of any EOP Common Shares issued to such Affiliate pursuant to the
Company Merger, except pursuant to an effective registration statement under the
Securities Act or in compliance with Rule 145(d) thereunder or as otherwise
permitted by the Securities Act. EOP shall be entitled to place legends as
specified in such written agreements on the certificates representing any EOP
Common Shares to be received pursuant to the terms of the Agreement by such
Affiliates who have executed such agreements and to issue appropriate stop
transfer instructions to the transfer agent for the EOP Common Shares issued to
such Affiliates, consistent with the terms of such agreements. EOP has agreed
that, at all times after the Effective Time, it shall timely file the reports
required to be filed by it under the Exchange Act and the rules and regulations
adopted by the Commission thereunder, and it will take such further action as
any Affiliate of Beacon or EOP may reasonably request, all to the extent
required from time to time to enable such Affiliate to sell EOP Common Shares
received by such Affiliate in the Merger without registration under the
Securities Act pursuant to (i) Rule 145(d)(1) under the Securities Act, as such
rule may be amended from to time, or (ii) any successor rule or regulation
hereafter adopted by the Commission.
 
OTHER RELATED TRANSACTIONS
 
     STOCK PURCHASE AGREEMENTS.  Concurrently with the execution of the
Agreement, the holders (other than Beacon Partnership) of the voting capital
stock of each of the Beacon Services Companies, each of which is a Subsidiary of
Beacon, have entered into Stock Purchase Agreements with EOP Management Corp.,
pursuant to which they have agreed to sell such stock to EOP Management Corp. or
its designee. Such sales will be consummated at the closing of the transactions
under the Agreement.
 
     VOTING AGREEMENTS.  In connection with the execution of the Agreement,
certain members of the Leventhal and Sidman families and certain trusts and
partnerships established for their benefit, which collectively hold
approximately 1.3% of the outstanding Beacon Common Shares and approximately 37%
of the outstanding Beacon Partnership Units not held by Beacon, have agreed,
among other things, to vote their Beacon Common Shares and Beacon Partnership
Units to approve the Agreement, the respective Mergers and any other matter
which requires their vote in connection with the transactions contemplated by
the Agreement. In addition, certain entities affiliated with Mr. Zell which are
predecessors to EOP and several trusts established for the benefit of members of
the family of Mr. Zell (collectively, the "EOP Predecessor Securityholders")
have agreed to cast all votes attributable to EOP Common Shares held by the EOP
Predecessor Securityholders in favor of the election of the two nominees
proposed by Beacon as trustees of EOP. If one of these members is then elected
for a one-year term, upon completion of such term and renomination, the EOP
Predecessor Securityholders agree to cast all votes attributable to the EOP
Common Shares held by EOP Partnership and the EOP Predecessor Securityholders in
favor of election of such nominee to a three-year term.
 
     AGREEMENT REGARDING ROWES WHARF LIMITED PARTNERSHIP.  Rowes Wharf Limited
Partnership holds a 50% general partnership interest in Rowes Wharf Associates,
the partnership that owns the hotel space and leases the office and retail space
at the Rowes Wharf property. Two of the Beacon Services Companies hold,
collectively, a 90% limited partnership interest in Rowes Wharf Limited
Partnership, with the remaining 9% limited partnership interest held by
affiliates of Beacon, and the 1% general partnership interest held by RWLP
Corp., a corporation owned by affiliates of Beacon. To enable EOP Management
Corp. to control Rowes Wharf Limited Partnership in the future, Beacon and the
Beacon Partnership have agreed to use their reasonable best efforts to (i) cause
RWLP Corp. to sell its interest in Rowes Wharf Limited Partnership to EOP
Management Corp. (or its designee) within two years following the Effective
Time, (ii) cause the holders of RWLP Corp. stock to sell such stock to EOP
Management Corp. (or its designee) within two years of the Effective Time, or
(iii) take any other actions regarding RWLP Corp. as may be requested by EOP
Management Corp., including, without limitation, converting RWLP Corp.'s general
partnership interest to a limited partnership interest and consenting to the
admission of a substitute general partner designated by EOP Management Corp. Any
purchase of an interest in or held by RWLP Corp. will be for fair market value.
 
                                       65
<PAGE>   74
 
Neither EOP nor EOP Partnership will have any rights with respect to the Rowes
Wharf Limited Partnership, other than by reason of their ownership of an
interest in EOP Management Corp., Beacon Construction Company and Beacon
Property Management Company.
 
BEACON RECOMMENDS A VOTE FOR THE PARTNERSHIP MERGER, THE AGREEMENT AND THE
TRANSACTIONS CONTEMPLATED THEREBY.
 
                                APPRAISAL RIGHTS
 
     Beacon Partnership was organized under the Delaware Revised Uniform Limited
Partnership Act ("Partnership Act"). Under the Partnership Act a limited
partnership agreement or a merger agreement may contractually provide for
appraisal rights with respect to limited partnership interests. The Beacon
Partnership Agreement does not contain a provision granting appraisal rights to
holders of Beacon Partnership Units. The Agreement specifically provides that
Beacon Unitholders will not have appraisal rights.
 
                                       66
<PAGE>   75
 
                                BUSINESS OF EOP
 
GENERAL
 
     EOP was formed to continue and expand the national office property business
organized by Mr. Samuel Zell, Chairman of the EOP Board. All EOP assets are
owned by, and its operations conducted through, EOP Partnership and its
subsidiaries. EOP believes that its portfolio (based on revenues and square
footage) is the largest office portfolio in the United States controlled by any
publicly traded, full-service office company. As of September 30, 1997, EOP
owned and operated 93 institutional quality office properties containing 33.4
million rentable square feet, and owned 16 stand-alone parking facilities
containing 16,037 parking spaces. The EOP Office Properties are located
throughout the United States in 48 submarkets in 35 markets in 20 states and the
District of Columbia. Since September 30, 1997, EOP has acquired an additional
21 office properties containing approximately 6.4 million rentable square feet
of office space, thereby increasing the size of its portfolio to 114 office
properties containing approximately 39.8 million rentable square feet. All of
EOP's assets are owned by, and its operations conducted through, EOP Partnership
and its subsidiaries. EOP is the managing general partner of EOP Partnership.
 
     EOP currently has approximately 847 employees providing in-house expertise
in property management, leasing, finance, tax, acquisition, development,
disposition, marketing, accounting, information systems and real estate law. The
five most senior executives have an average tenure of 11 years with EOP or its
affiliates and an average of 23 years experience in the real estate industry.
 
     During the past several years, EOP has been among the most active buyers of
institutional quality office properties throughout the United States, investing
in excess of $3.7 billion during the period from 1987 through September 1997 and
averaging $779 million annually in acquisitions (calculated on a cost basis) for
the three years ended September 30, 1997.
 
     EOP has demonstrated the ability to lease up the space it has acquired. At
the time of acquisition, the EOP Office Properties were, on a weighted average
basis, 76% occupied. During the period from 1988 through September 1997, EOP
leased (net of expiring leases) in excess of an additional 5.8 million rentable
square feet of office space. As of September 30, 1997, the EOP Office Properties
were 93.2% occupied by 3,099 tenants.
 
     As of September 30, 1997, the EOP Office Properties contained an average of
359,000 rentable square feet. Of the 3,099 tenants for the EOP Office
Properties, none accounted for more than 2.3% of the EOP portfolio's annualized
rent.
 
     Management believes that larger properties allow for a higher quality of
tenant services, justify on-site management and facilitate economies of scale.
EOP, therefore, generally will not acquire office properties with less than
200,000 rentable square feet except in connection with a merger, portfolio
acquisition or geographic assemblage of properties. EOP's view is that, over the
long term, its return on investment in large, institutional quality properties
will be enhanced where tenants are provided with superior tenant services,
physical improvements and locations.
 
     Management believes that a geographically diverse portfolio minimizes risk
and stabilizes earnings. As a result of its ownership presence in 35 markets,
which include 48 submarkets, EOP has local market expertise and knowledge in
markets situated throughout the United States. The EOP Office Properties and the
Managed Properties are located in suburban areas as well as CBDs. Some office
tenants are attracted to suburban locations that may offer proximity to
residential housing and the availability of inexpensive parking. Other tenants,
however, have requirements for transportation, labor, or close physical access
to governmental or institutional offices that attract them to CBDs. The EOP
Office Properties, by number of buildings, are located 33% in CBDs and 67% in
suburban markets and, by rentable square feet, 53% in CBDs and 47% in suburban
markets. Through EOP Management Corp., EOP manages an additional 33 office
properties, containing 3.7 million rentable square feet, owned by certain
affiliates of the Equity Group. The Managed
 
                                       67
<PAGE>   76
 
Properties, by number of buildings, are located 9% in CBDs and 91% in suburban
markets and, by rentable square feet, 28% in CBDs and 72% in suburban markets.
 
           DISTRIBUTION OF EOP OFFICE PROPERTIES, MANAGED PROPERTIES
          AND PARKING FACILITIES BY REGION (AS OF SEPTEMBER 30, 1997)
 
<TABLE>
<CAPTION>
                                                                                              EOP PARKING
                                          EOP OFFICE PROPERTIES     MANAGED PROPERTIES         FACILITIES
                                          ----------------------   --------------------   --------------------
                                                      RENTABLE               RENTABLE                NUMBER      NUMBER OF
REGION                 OFFICE             NUMBER    SQUARE FEET    NUMBER   SQUARE FEET   NUMBER    OF SHARES    EMPLOYEES
- ------                 ------             -------   ------------   ------   -----------   ------   -----------   ----------
<S>                    <C>                <C>       <C>            <C>      <C>           <C>      <C>           <C>
Pacific                Los Angeles                                                                                   75
  CBD                                         6       4,243,902      --             --
  Suburban                                   12       2,506,841       5        320,468
 
Southeast              Atlanta                                                                                      108
  CBD                                         6       2,887,795       1        130,189       1          759
  Suburban                                    8       2,120,652       2        207,664
 
Northeast              Washington, D.C.                                                                             151
  CBD                                         6       2,625,458      --             --       6        3,140
  Suburban                                   11       2,537,749       3        598,576
 
Central                Chicago                                                                                      340(1)
  CBD                                         7       5,261,555       2        877,889       5        4,674
  Suburban                                    4       1,286,556      17      1,085,407
 
Southwest              Houston                                                                                      103
  CBD                                         5       2,588,819      --             --
  Suburban                                    9       3,159,286       2        277,953
 
West                   Denver                                                                                        70
  CBD                                         1         230,022      --             --       4        7,464
  Suburban                                   18       3,958,342       1        157,311
                                             --      ----------      --      ---------      --       ------         ---
    Total                                    93      33,406,977      33      3,655,457      16       16,037         847
                                             ==      ==========      ==      =========      ==       ======         ===
</TABLE>
 
- ---------------
(1) 194 of these employees are located at EOP's headquarters.
 
OPERATIONS
 
     The operation of the EOP Properties is under the direction of five regional
managers, each of whom has oversight responsibility for all of the EOP
Properties in his respective region. Each region has strategic and budget
planning responsibility combined with due diligence, property management,
engineering/construction, leasing/marketing, and information systems expertise.
Each regional manager reports to EOP's Executive Vice President -- Real Estate
Operations.
 
OPERATIONAL STRUCTURE
 
     EOP Partnership is the entity through which EOP owns its properties. The
ownership and management structure of EOP is intended to (i) enable EOP to
acquire assets in transactions that may defer some or all of the sellers' tax
consequences and (ii) enable EOP to comply with certain technical and complex
requirements under the federal tax rules and regulations relating to the assets
and income permitted for a REIT.
 
     EOP Management Corp. provides office property and asset management services
(the "Managed Property Business") to the 33 Managed Properties and to the EOP
Joint Venture Properties described below. EOP Management Corp. collects a
property management fee for the performance of such services. To maintain EOP's
qualification as a REIT, EOP Partnership owns 100% of the non-voting stock of
EOP Management Corp., representing a 95% economic interest, and EOH, an entity
owned by the Equity Group Owners, owns 100% of the voting stock of the
Management Corp., representing a 5% economic interest.
 
                                       68
<PAGE>   77
 
     The 17 EOP Joint Venture Properties are held in ownership entities with
unaffiliated third parties. Ten of the EOP Joint Venture Properties are office
properties and seven are parking facilities. EOP Partnership or a subsidiary is
the managing general partner of each of the EOP Joint Venture Properties (except
for Civic Parking L.L.C., where a subsidiary of EOP Partnership is one of two
managing members).
 
     EOP's acquisition and oversight of its Parking Facilities is administered
through a wholly owned subsidiary, Equity Capital Holdings, L.P. All but one of
the EOP Parking Facilities are leased to and operated by third-party parking
garage service companies (the "Service Companies") under leases where the
Service Companies bear the operating expenses. The arrangements with the Service
Companies may be modified in the future if EOP receives a favorable ruling from
the IRS. See "FEDERAL INCOME TAX CONSIDERATIONS -- Requirements for
Qualification as a REIT -- Income Tests Applicable to REITs."
 
FORMATION TRANSACTIONS
 
     BACKGROUND.  EOP was formed pursuant to the consolidation (the
"Consolidation") in July 1997 of the ownership of the EOP Properties owned by
the four Zell/Merrill Lynch institutional real estate investment funds (each a
"ZML Fund" and collectively, the "ZML Funds"), and the Management Business (as
defined below) which was owned by the Equity Group. The ZML Funds were formed
during the period from 1988 to 1996 to acquire, improve, own, manage, operate
and dispose of primarily office properties.
 
     Each ZML Fund consisted of (i) a limited partnership organized under the
laws of the State of Illinois (each a "ZML Opportunity Partnership"), (ii) a
general partner of such ZML Opportunity Partnership (each a "ZML Partner") which
was controlled by Mr. Zell and in which Merrill Lynch & Co. ("Merrill Lynch")
was a limited partner and (iii) a Delaware corporation or Maryland real estate
investment trust (each a "ZML REIT"), as the case may be, that served as the
majority limited partner in ZML Opportunity Partnerships I and II and the sole
limited partner in ZML Opportunity Partnerships III and IV. There were several
institutional investor limited partners in ZML Opportunity Partnerships I and II
(collectively, "Investor Limited Partners") in addition to ZML REITs I and II.
All of the Investor Limited Partners were given an opportunity to convert their
interest into an interest in the corresponding ZML REIT in connection with the
Consolidation (which interests were subsequently converted into EOP Common
Shares as described below), and all but one Investor Limited Partner (in ZML
Opportunity Partnership II) elected to do so.
 
     CONSOLIDATION.  In advance of or simultaneous with the IPO, EOP engaged in
the transactions described below, which were designed to consolidate the
ownership of the EOP Office Properties, the EOP Parking Facilities and the
Management Business, to facilitate the IPO and to enable EOP to qualify as a
REIT for federal income tax purposes commencing with the taxable year ending
December 31, 1997.
 
     - The ZML Opportunity Partnerships (the predecessor owners of the EOP
       Office Properties and Parking Facilities) contributed to EOP Partnership
       all of their interests in the EOP Office Properties and Parking
       Facilities, which included interests in the EOP Joint Venture Properties,
       that comprised EOP's initial portfolio.
 
     - The ZML REITs (each a majority or sole limited partner of a ZML
       Opportunity Partnership) merged into EOP, with EOP succeeding to their
       interest in, and becoming the managing general partner of, the ZML
       Opportunity Partnerships.
 
     - Certain entities (collectively, the "Equity Group") owned directly or
       indirectly by certain trusts (together with certain partnerships
       comprised of such trusts, the "Equity Group Owners") established for the
       benefit of the families of Mr. Zell and of Mr. Robert Lurie, the deceased
       former partner of Mr. Zell, contributed to EOP Partnership substantially
       all of the interests in their office property and asset management
       businesses and parking facility asset management business (collectively,
       the "Management Business").
 
     - Shareholders in the ZML REITs received EOP Common Shares in exchange for
       their interests in the ZML REITs.
 
                                       69
<PAGE>   78
 
     - Partners in the ZML Opportunity Partnerships (including EOP as the
       successor to the ZML REITs) will receive EOP Partnership Units (to be
       distributed over the two-year period ending July 11, 1999). Such EOP
       Partnership Units are intended to correspond in value to, and be
       exchangeable commencing two years following the closing of the IPO for,
       EOP Common Shares or, at EOP's option, cash equal to the fair market
       value of such EOP Common Shares.
 
     - Units in EOP Partnership were issued to the Equity Group in exchange for
       the Management Business, which EOP Partnership Units will be exchangeable
       for EOP Common Shares, or, at EOP's option, the cash equivalent thereof,
       commencing one year following the closing of the IPO.
 
     - The Management Business made a distribution to the Equity Group Owners of
       cash on hand from pre-closing operations, which funds were not acquired
       by EOP pursuant to the Consolidation. Affiliates of Mr. Zell received
       approximately $5.3 million of such distribution.
 
     - EOP Partnership transferred the Managed Property Business to EOP
       Management Corp., in which EOP Partnership now owns nonvoting stock
       representing 95% of the equity interest and EOH owns all of the voting
       stock, representing 5% of the equity interest.
 
     The principal executive offices of EOP and EOP Partnership are located at
Two North Riverside Plaza, 22nd Floor, Chicago, Illinois 60606, and their
telephone number is (312) 466-3300. EOP maintains regional offices in Los
Angeles, Denver, Houston, Chicago, Atlanta and Washington, D.C.
 
RECENT DEVELOPMENTS
 
     ACQUISITIONS.  Since September 30, 1997, EOP has completed a number of new
acquisitions.
 
     On October 1, 1997, EOP acquired a total of approximately 2.5 million
square feet in Houston, Dallas and Philadelphia from The Prudential Insurance
Company of America ("Prudential"). The aggregate purchase price of $289 million
was paid $211.9 million in cash, $6.0 million in assumed liabilities and $71.1
million in EOP Partnership Units (valued at a price of $24.50 per unit). These
six properties are: (i) Destec Tower, a 25-story, 574,216 square foot tower in
the Westchase area of Houston; (ii) Brookhollow Central I, II and III, a 800,688
square foot office complex in suburban Houston; (iii) 8080 Central, a 17-story,
283,707 square foot office building in the North Central Expressway submarket of
Dallas; and (iv) 1700 Market, a 32-story, 825,547 square foot office building in
the Market Street West area of downtown Philadelphia. Average occupancy for the
entire portfolio is 87.4%. This acquisition increased EOP's total square footage
in Houston from 1.36 million to 2.74 million square feet, in Dallas from 1.84
million to 2.13 million square feet, and in Philadelphia from 681,289 to 1.50
million square feet. On October 6, 1997, in a separate transaction, two
investment funds, as assignees of Prudential, purchased approximately $74
million of restricted EOP Common Shares at $24.50 per share.
 
     On October 6, 1997, EOP acquired a 27-story, 566,434 square foot office
building in downtown Los Angeles, California. The purchase price of $99.5
million was paid in cash. The property, 550 South Hope, includes a 549-space
parking garage.
 
     On October 7, 1997, EOP purchased two 40-story office towers containing an
aggregate of 2,003,377 net rentable square feet in Chicago, Illinois for $462
million in cash. The properties, 10 and 30 South Wacker Drive, contain 500
parking spaces and are connected by the Chicago Mercantile Exchange (which EOP
did not acquire).
 
     On October 7, 1997, EOP closed on the purchase of controlling interests in
nine office properties containing 1.0 million rentable square feet located in
suburban Philadelphia from partnerships affiliated with the owners of Acorn
Development Corporation. Total consideration paid for the controlling interests
was $127.5 million, of which approximately $14.7 million was assumed debt, $14.4
million was paid in EOP Partnership Units valued at $28.775 per Unit, and the
balance was paid in cash. Agreement has been reached for the purchase by EOP of
controlling interests in two additional office properties, also located in
suburban Philadelphia and also owned by partnerships affiliated with the owners
of Acorn Development Corporation, for additional consideration in the
approximate amount of $17.2 million of which approximately $4 million will be
 
                                       70
<PAGE>   79
 
payable in EOP Partnership Units valued at $28.775 per Unit, with the balance
comprised of a combination of cash and the assumption of debt. EOP shall have
the option of purchasing the remaining interests in all 11 properties,
exercisable for a designated period commencing three years after the respective
closing dates on the initial purchases, for additional consideration in the
amount of approximately $2.1 million, all payable in EOP Partnership Units
valued at $28.775 per Unit.
 
     On October 17, 1997, EOP acquired a 10-story office building containing
314,634 net rentable square feet of office/rental space and a 264 space
underground parking garage in Washington, D.C. The property, located at 1120
20th Street, N.W. and known as One Lafayette Centre, was acquired for an
aggregate purchase price of $82.5 million, consisting of $24.4 million in EOP
Partnership Units (valued at a price of $32.975 per unit), assumed liabilities
of $5.3 million, and $52.8 million in cash.
 
     On October 20, 1997, EOP sold $200 million of Common Shares in an
unregistered private placement to an institutional investor at $30.00 per share.
 
     FINANCING TRANSACTIONS.  Since the IPO in July 1997, EOP has completed a
number of new financing transactions. On September 3, 1997, EOP Partnership
issued $180 million of the EOP Unsecured Notes in a private placement with an
institutional investor and used the proceeds therefrom to repay amounts
outstanding under the $600 million Credit Facility.
 
     EOP Partnership entered into the $1.5 billion Credit Facility on October 2,
1997 with Morgan Guaranty Trust Company of New York. The $1.5 billion Credit
Facility, which matures July 1, 1998, will be used to repay amounts outstanding
under the $600 million Credit Facility and fund future acquisitions.
 
BUSINESS AND GROWTH STRATEGIES
 
     EOP's primary business objective is to achieve sustainable long-term growth
in cash flow per share and to maximize long-term shareholder value. EOP intends
to achieve this objective by owning and operating institutional quality office
buildings and providing a superior level of service to tenants in CBDs and
suburban markets across the United States. EOP intends to supplement this
strategy by the strategic acquisition of parking facilities.
 
     INTERNAL GROWTH.  Management believes EOP's future internal growth will
come from (i) lease up of vacant space, (ii) tenant roll-over at increased rents
where market conditions permit, (iii) repositioning of certain EOP Properties
which have not yet achieved stabilization, and (iv) increasing economies of
scale.
 
     As of September 30, 1997, 2.3 million rentable square feet of EOP Office
Property space was vacant. Of this amount, 556,000 square feet was leased, with
occupancy yet to commence. EOP believes that the current average market rent for
this space is $24.17 per square foot. EOP's average operating expenses for this
space
 
                                       71
<PAGE>   80
 
are $9.18 per square foot. The following five EOP Properties account for 40% of
the total vacant space as of September 30, 1997:
 
<TABLE>
<CAPTION>
                                                                               AMOUNT OF
                                                                             VACANT SQUARE
                                                               VACANT           FOOTAGE
                                                           SQUARE FOOTAGE      LEASED(1)
                                                           --------------    -------------
<S>                                                        <C>               <C>
28 State Street, Boston, MA..............................      250,807          109,479
Two California Plaza, Los Angeles, CA....................      161,803            9,451
161 North Clark, Chicago, IL.............................      271,601          251,036
Oakbrook Terrace Tower, Oak Brook Terrace, IL............      103,725                0
Texaco Center, New Orleans, LA...........................      110,714                0
                                                             ---------          -------
                                                               898,650          369,966
                                                             =========          =======
</TABLE>
 
- ---------------
(1) Represents the amount of unoccupied space as of September 30, 1997 that was
    subject to an executed lease with a commencement date after September 30,
    1997.
 
     During the period from September 30, 1997 through December 31, 2001, 2,254
leases for 15.2 million rentable square feet of space are scheduled to expire.
As of September 30, 1997, the average rent for this space was $20.34 per square
foot, the current market rent for such space averaged $23.31 per square foot,
and the weighted average operating expenses were $8.21 per square foot.
Accordingly, EOP expects that leases expiring through December 31, 2001 will be
renewed, or such space relet, at higher rents. The actual rental rates at which
available space will be relet will depend on prevailing market factors at the
time. There can be no assurance that EOP will relet such space at an increased,
or even at the then current, rental rate.
 
     As the largest publicly traded full service office company (based on
revenue and square footage) in the United States, EOP expects to benefit from
certain economies of scale. Management intends to maximize the benefits
attributable to its large scale operations by aggressive cash management, bulk
purchasing, national and regional service agreements and utilization of
state-of-the-art information technology (which provides EOP with extensive
operational data, including daily leasing, occupancy and other property and
financial data). Historically, as the portfolio has increased in size, EOP's
general and administrative costs as a percentage of total revenue have
decreased.
 
     EOP owns a total of approximately 50 acres of undeveloped land adjacent to
15 EOP Office Properties on which approximately 2.1 million square feet of
office space could be developed. EOP may decide to develop this land if
significant pre-leasing can be arranged, but does not currently anticipate other
development activities.
 
     EXTERNAL GROWTH.  EOP is pursuing, and expects to continue to actively
pursue, acquisitions of additional office properties and parking facilities.
Management believes that significant opportunities for external growth will
continue to be available through strategic acquisitions of institutional quality
office properties. Management believes that such properties may be acquired for
less than replacement cost in certain markets and that current rents generally
do not justify new construction in many of these markets. Properties may be
acquired separately or as part of a portfolio, and may be acquired for cash
and/or in exchange for equity or debt securities of EOP, and such acquisitions
may be customary real estate transactions and/or mergers or other business
combinations.
 
     The real estate industry is in the early stages of a major consolidation
which EOP believes will continue as institutional owners gain increasing
confidence in indirect rather than direct ownership of real estate. EOP
generally has acquired the EOP Office Properties from institutional sellers.
Emerging Trends in Real Estate 1997, published by Equitable Real Estate
Investment Management, Inc. and Real Estate Research Corporation, estimates that
institutions currently have direct investments of approximately $1.3 trillion in
commercial real estate in the United States. EOP believes that given its size,
its UPREIT structure (which enables it to acquire properties in transactions
that may permit sellers to defer tax consequences) and its historic relationship
with many of the major institutional owners of real estate in the United States,
it will be
 
                                       72
<PAGE>   81
 
well positioned to benefit from the consolidation that is occurring in the real
estate industry.
 
     PARKING FACILITIES.  Management believes that parking facilities offer EOP
attractive investment opportunities which will be complementary to investments
in office properties. Because the parking industry is highly fragmented, would
benefit from economies of scale and is in the early stages of consolidation and
privatization, management expects there to be future opportunities to acquire
parking facilities from smaller owners who lack capital for expansion,
technological upgrades or repairs. Management also expects municipalities and
other government entities to be a significant source of properties for
acquisition as budget constraints force such entities to consider nontraditional
sources of capital such as privatization of parking facilities. EOP will focus
its acquisition efforts solely on municipal or private parking facilities that
have limited competition, no (or minimal) rental rate restrictions and/or a
superior location proximate to or affiliated with airports, CBDs, entertainment
projects or health care facilities.
 
PRICE RANGE OF EOP COMMON SHARES AND DISTRIBUTION HISTORY
 
     The EOP Common Shares have been traded on the NYSE under the symbol "EOP"
since the IPO. As of November 14, 1997, EOP's transfer agent reported 459 record
holders of EOP Common Shares as of November 14, 1997, and the Depository Trust
Company held approximately 28,684,925 million EOP Common Shares on behalf of
various beneficial owners as of September 30, 1997. The following table sets
forth the quarterly high and low closing prices per share reported on the NYSE
and the distributions paid by EOP with respect to the periods noted. On October
9, 1997, EOP and EOP Partnership each paid a distribution of $.26 per EOP Common
Share and per EOP Partnership Unit, respectively, representing a pro rata
distribution (based on a $.30 full quarterly distribution) for the period
beginning July 11, 1997 and ended September 30, 1997.
 
<TABLE>
<CAPTION>
                                                                         DISTRIBUTION
QUARTER ENDED                                  HIGH        LOW        PER SHARE AND UNIT
- -------------                                  ----        ---        ------------------
<S>                                            <C>         <C>        <C>
September 30, 1997...........................  $33 15/16    $26 1/6            $.26
December 31, 1997 (through November 12,
  1997)......................................  $34  1/4     $27 1/2            $.30(1)
</TABLE>
 
- -------------------------
(1) EOP has declared a distribution of $.30 per EOP Common Share and EOP
    Partnership Unit payable to holders of record on December 10, 1997, to be
    paid on December 19, 1997.
 
                                       73
<PAGE>   82
 
                                EOP PARTNERSHIP
 
               SELECTED CONSOLIDATED AND COMBINED FINANCIAL DATA
 
     The following sets forth selected consolidated and combined financial and
operating information on an historical basis for EOP Partnership and the EOP
Predecessors. The following information should be read in conjunction with the
consolidated and combined financial statements and notes thereto of EOP
Partnership and the EOP Predecessors included elsewhere in this Proxy
Statement/Prospectus. The selected consolidated historical financial and
operating information of EOP Partnership at September 30, 1997 and for the
period from July 11, 1997 to September 30, 1997, has been derived from the
historical financial and operating information of EOP Partnership. The selected
combined historical and operating information of the EOP Predecessors for the
period from January 1, 1997 to July 10, 1997 and the nine months ended September
30, 1996, has been derived from the historical unaudited combined financial
statements of the EOP Predecessors. The selected combined historical financial
and operating information of the EOP Predecessors at December 31, 1996 and 1995,
and for each of the three years in the period ended December 31, 1996, has been
derived from the historical combined financial statements of the EOP
Predecessors audited by Ernst & Young LLP, independent auditors, whose report
with respect thereto is included elsewhere in this Proxy Statement/ Prospectus.
The selected combined historical financial and operating information of the EOP
Predecessors at December 31, 1994, 1993 and 1992, and for each of the two years
in the period ended December 31, 1993, has been derived from the historical
unaudited combined financial statements of the EOP Predecessors.
<TABLE>
<CAPTION>
                                 EOP              EOP
                             PARTNERSHIP      PREDECESSORS    EOP PREDECESSORS
                            FOR THE PERIOD   FOR THE PERIOD     NINE MONTHS
                            FROM JULY 11,         FROM             ENDED
                               1997 TO         JANUARY 1,      SEPTEMBER 30,
                            SEPTEMBER 30,       1997 TO       ----------------
                                 1997        JULY 10, 1997          1996
                            --------------   --------------         ----
<S>                         <C>              <C>              <C>
OPERATING DATA:
Revenue:
 Rental, parking and
   other..................    $  162,290       $ 327,017         $ 343,660
                              ==========       =========          ========
   Total Revenue..........    $  164,568         339,104           353,237
                              ==========       =========          ========
Expenses:
 Interest.................        25,793          80,481            87,551
 Depreciation and
   amortization...........        24,161          66,034            69,193
 Property operating
   expenses(1)............        62,885         127,285           141,823
 General and
   administrative.........         5,855          17,201            16,278
 Provision for value
   impairment.............             0               0                 0
                              ----------       ---------          --------
   Total Expenses.........    $  118,694       $ 291,001         $ 314,845
                              ==========       =========          ========
Income before (income)
 loss allocated to
 minority interests,
 income from investments
 in unconsolidated joint
 ventures, gain on sale of
 real estate, and
 extraordinary items......    $   45,874       $  48,103         $  38,392
Minority interests
 allocation...............          (279)           (912)           (2,166)
Income from investments in
 unconsolidated joint
 ventures.................         1,426           1,982             1,554
Gain on sale of real
 estate and extraordinary
 items....................       (12,930)         12,236             5,262
                              ----------       ---------          --------
   Net income.............    $   34,091       $  61,409         $  43,042
                              ==========       =========          ========
   Net income per unit....    $      .21
                              ==========
BALANCE SHEET DATA (AT END
 OF PERIOD):
Investment in real estate
 after accumulated
 depreciation.............    $5,000,159              --                --
   Total assets...........     5,355,922              --                --
Mortgage debt, notes
 payable and revolving
 line of credit...........     1,716,458              --                --
   Total liabilities......     1,892,170              --                --
Minority interests........        28,118              --                --
Partners' Capital/Owners'
 Equity...................     3,435,634              --                --
 
<CAPTION>



 
                                 EOP PREDECESSORS (COMBINED HISTORICAL) YEARS ENDED
                                                    DECEMBER 31,
                            ------------------------------------------------------------
                               1996         1995         1994         1993        1992
                               ----         ----         ----         ----        ----
<S>                         <C>          <C>          <C>          <C>          <C>
OPERATING DATA:
Revenue:
 Rental, parking and
   other..................  $  493,396   $  356,959   $  230,428   $  150,315   $ 96,787
                            ==========   ==========   ==========   ==========   ========
   Total Revenue..........  $  508,124   $  371,457   $  240,878   $  159,246   $107,154
                            ==========   ==========   ==========   ==========   ========
Expenses:
 Interest.................  $  119,595   $  100,566   $   59,316   $   36,755   $ 25,775
 Depreciation and
   amortization...........      96,237       74,156       46,905       29,752     19,266
 Property operating
   expenses(1)............     201,067      151,488      107,412       74,028     48,856
 General and
   administrative.........      23,145       21,987       15,603       12,012      8,720
 Provision for value
   impairment.............           0       20,248            0            0          0
                            ----------   ----------   ----------   ----------   --------
   Total Expenses.........  $  440,044   $  368,445   $  229,236   $  152,547   $102,617
                            ==========   ==========   ==========   ==========   ========
Income before (income)
 loss allocated to
 minority interests,
 income from investments
 in unconsolidated joint
 ventures, gain on sale of
 real estate, and
 extraordinary items......  $   68,080   $    3,012   $   11,642   $    6,699   $  4,537
Minority interests
 allocation...............      (2,086)      (2,129)       1,437        1,772      1,793
Income from investments in
 unconsolidated joint
 ventures.................       2,093        2,305        1,778            0          0
Gain on sale of real
 estate and extraordinary
 items....................       5,338       31,271        1,705           --         --
                            ----------   ----------   ----------   ----------   --------
   Net income.............  $   73,425   $   34,459   $   16,562   $    8,471   $  6,330
                            ==========   ==========   ==========   ==========   ========
   Net income per unit....
 
BALANCE SHEET DATA (AT END
 OF PERIOD):
Investment in real estate
 after accumulated
 depreciation.............  $3,291,815   $2,393,403   $1,815,160   $1,220,268   $820,805
   Total assets...........   3,912,565    2,650,890    2,090,933    1,318,644    912,631
Mortgage debt, notes
 payable and revolving
 line of credit...........   1,964,892    1,434,827    1,261,156      798,897    526,830
   Total liabilities......   2,174,483    1,529,334    1,350,552      845,315    552,666
Minority interests........      11,080       31,587        9,283      (15,298)   (14,133)
Partners' Capital/Owners'
 Equity...................   1,727,002    1,089,969      731,098      488,627    374,098
</TABLE>
 
                                       74
<PAGE>   83
<TABLE>
<CAPTION>
                                 EOP              EOP
                             PARTNERSHIP      PREDECESSORS    EOP PREDECESSORS
                            FOR THE PERIOD   FOR THE PERIOD     NINE MONTHS
                            FROM JULY 11,         FROM             ENDED
                               1997 TO         JANUARY 1,      SEPTEMBER 30,
                            SEPTEMBER 30,       1997 TO       ----------------
                                 1997        JULY 10, 1997          1996
                            --------------   --------------         ----
<S>                         <C>              <C>              <C>
OTHER DATA:
General and administrative
 expenses as a percentage
 of total revenues........           3.6%             --               4.6%
Number of Office
 Properties owned at
 period end(2)(3).........            93              --                78
Net rental square feet of
 Office Properties owned
 at period end (in
 millions)(2).............          33.4              --              27.8
Occupancy of Office
 Properties owned at
 period end(2)............           93%              --                89%
Number of Parking
 Facilities owned at
 period end...............            16              --                 3
Number of spaces at
 Parking Facilities owned
 at period end............        16,037              --             7,321
Funds from
 Operations(4)............    $   70,148       $ 113,022         $ 103,798
Cash flow from operating
 activities...............    $   59,665       $  95,960         $  89,685
Cash flow from investing
 activities...............    $  (85,634)      $(571,068)        $(589,340)
Cash flow from financing
 activities...............    $  158,893       $ 245,851         $ 530,280
Ratio of earnings to fixed
 charges..................          2.57            1.52              1.41
 
<CAPTION>
 
                                 EOP PREDECESSORS (COMBINED HISTORICAL) YEARS ENDED
                                                    DECEMBER 31,
                            ------------------------------------------------------------
                               1996         1995         1994         1993        1992
                               ----         ----         ----         ----        ----
<S>                         <C>          <C>          <C>          <C>          <C>
OTHER DATA:
General and administrative
 expenses as a percentage
 of total revenues........         4.6%         5.9%         6.5%         7.5%       8.1%
Number of Office
 Properties owned at
 period end(2)(3).........          83           73           63           48         33
Net rental square feet of
 Office Properties owned
 at period end (in
 millions)(2).............        29.2         23.1         18.5         13.6        9.1
Occupancy of Office
 Properties owned at
 period end(2)............          90%          86%          88%          80%        73%
Number of Parking
 Facilities owned at
 period end...............          10            3            0            0          0
Number of spaces at
 Parking Facilities owned
 at period end............       7,321        3,323            0            0          0
Funds from
 Operations(4)............  $  160,460       96,104   $   60,372           --         --
Cash flow from operating
 activities...............  $  165,975   $   93,878   $   73,821           --         --
Cash flow from investing
 activities...............  $ (924,227)  $ (380,615)  $ (513,965)          --         --
Cash flow from financing
 activities...............  $1,057,551   $  276,513   $  514,923           --         --
Ratio of earnings to fixed
 charges..................        1.49         1.21         1.24         1.23       1.24
</TABLE>
 
- -------------------------
(1) Includes EOP Property operating expenses, real estate taxes, insurance, as
    well as repair and maintenance expenses.
 
(2) The data at the periods ended September 30, 1997, December 31, 1996 and 1995
    includes 28 State Street, a 570,040 square foot EOP Office Property which
    recently has undergone major redevelopment and was vacant prior to May,
    1997. The weighted average occupancy, excluding 28 State Street, as of
    September 30, 1997, December 31, 1996 and 1995 was approximately 94%, 92%
    and 88%, respectively.
 
(3) The number of EOP Office Properties owned as of December 31, 1996, as
    reflected in the combined historical financial statements, includes Barton
    Oaks Plaza II, an EOP Office Property which was sold in January, 1997 and
    8383 Wilshire, an EOP Office Property which was sold in May, 1997.
 
(4) The White Paper on Funds from Operations approved by the Board of Governors
    of the National Association of Real Estate Investment Trusts ("NAREIT") in
    March 1995 defines Funds from Operations as net income (loss) (computed in
    accordance with GAAP), excluding gains (or losses) from debt restructuring
    and sales of properties, plus real estate related depreciation and
    amortization and after adjustments for unconsolidated partnerships and joint
    ventures. EOP Partnership believes that Funds from Operations is helpful to
    investors as a measure of the performance of an equity REIT because, along
    with cash flow from operating activities, financing activities and investing
    activities, it provides investors with an indication of the ability of EOP
    Partnership to incur and service debt, to make capital expenditures and to
    fund other cash needs. EOP Partnership computes Funds from Operations in
    accordance with standards established by NAREIT which may not be comparable
    to Funds from Operations reported by other REIT's that do not define the
    term in accordance with the current NAREIT definition or that interpret the
    current NAREIT definition differently than does EOP Partnership. Funds from
    Operations does not represent cash generated from operating activities in
    accordance with GAAP and should not be considered as an alternative to net
    income (determined in accordance with GAAP) as an indication of EOP
    Partnership's financial performance or to cash flow from operating
    activities (determined in accordance with GAAP) as a measure of EOP
    Partnership's liquidity, nor is it indicative of funds available to fund EOP
    Partnership's cash needs, including its ability to make distributions. For a
    reconciliation of net income and Funds from Operations, see "EOP PARTNERSHIP
    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
    OPERATIONS -- Funds from Operations."
 
                                       75
<PAGE>   84
 
            EOP PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
     The following discussion and analysis of the combined financial condition
and results of operations should be read in conjunction with the Consolidated
and Combined Financial Statements of EOP Partnership and the Combined Financial
Statements of the EOP Predecessors, respectively, and Notes thereto contained
herein. All references to the historical activities of EOP Partnership prior to
July 11, 1997 contained in this "EOP PARTNERSHIP MANAGEMENT'S DISCUSSION AND
ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS" refer to the
activities of the EOP Predecessors. Statements contained in this "EOP
PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND
RESULTS OF OPERATIONS" which are not historical facts may be forward-looking
statements. Such statements are subject to certain risks and uncertainties which
could cause actual results to differ materially from those projected. Readers
are cautioned not to place undue reliance on these forward-looking statements
which speak only as of the date hereof.
 
GENERAL
 
     The following discussion is based primarily on the Consolidated and
Combined Financial Statements of EOP Partnership and the Combined Financial
Statements of the EOP Predecessors, respectively, as of September 30, 1997 and
December 31, 1996 and 1995 and for the three and nine month periods ended
September 30, 1997 and 1996 and for each of the years ended December 31, 1996,
1995 and 1994.
 
     EOP Partnership receives income primarily from rental revenue from EOP
Office Properties (including reimbursements from tenants for certain operating
costs), parking revenue from EOP Office Properties and stand alone EOP Parking
Facilities, and, to a lesser extent, from fees from noncombined affiliates for
the management of the Managed Properties.
 
     As of September 30, 1997, EOP Partnership owned or had an interest in 93
EOP Office Properties totaling approximately 33.4 million square feet, and 16
stand alone EOP Parking Facilities with approximately 16,037 spaces (the "Total
Portfolio"). Of the Total Portfolio, 71 of these EOP Office Properties, totaling
approximately 22.6 million square feet, and three EOP Parking Facilities were
acquired prior to January 1, 1996; 11 EOP Office Properties, totaling
approximately 6.1 million square feet, and seven EOP Parking Facilities were
acquired in 1996; and 11 EOP Office Properties, totaling approximately 4.7
million square feet, and six EOP Parking Facilities, including an interest in
four EOP Parking Facilities, were acquired during the nine months ended
September 30, 1997. As a result of this rapid growth in the size of the Total
Portfolio, the financial data presented shows large increases in revenues and
expenses from year to year. For the foregoing reasons, EOP Partnership does not
believe its period to period financial data are comparable. Therefore, the
analysis below shows changes resulting from EOP Properties that were held during
the entire period for the periods being compared (the "Core Portfolio") and the
changes in Total Portfolio. The Core Portfolio for the comparison between the
nine months ended September 30, 1997 and 1996 consists of 71 EOP Office
Properties and three EOP Parking Facilities acquired prior to January 1, 1996.
The Core Portfolio for the comparison between the three months ended September
30, 1997 and 1996 consists of 73 EOP Office Properties and three EOP Parking
Facilities acquired prior to July 1, 1996. The Core Portfolio for these
comparisons excludes Barton Oaks Plaza II, a 118,529 square foot EOP Office
Property which was sold in January 1997, 8383 Wilshire, a 417,463 square foot
EOP Office Property, which was sold in May 1997, and 28 State Street, a 570,040
square foot EOP Office Property, which was undergoing major redevelopment for
the periods discussed. The Core Portfolio for the comparison between the years
ended December 31, 1996 and 1995 consists of the 63 EOP Office Properties
acquired prior to January 1, 1995. The Core Portfolio for the comparison between
the years ended December 31, 1995 and 1994 consists of the 48 EOP Office
Properties acquired prior to January 1, 1994. The Core Portfolio for these
comparisons includes Barton Oaks Plaza II and 8383 Wilshire.
 
                                       76
<PAGE>   85
 
RESULTS OF OPERATIONS
 
COMPARISON OF THREE MONTHS ENDED SEPTEMBER 30, 1997 TO THREE MONTHS ENDED
SEPTEMBER 30, 1996.
 
     The table below presents selected operating information for the Total
Portfolio and for the Core Portfolio which consists of the 73 EOP Office
Properties and three EOP Parking Facilities acquired prior to July 1, 1996. The
Core Portfolio excludes Barton Oaks Plaza II, which was sold in January 1997,
8383 Wilshire, which was sold in May 1997, and 28 State Street which has
recently undergone major redevelopment and was vacant prior to May 1997.
 
<TABLE>
<CAPTION>
                                                      TOTAL PORTFOLIO                               CORE PORTFOLIO
                                         -----------------------------------------    -------------------------------------------
                                                               INCREASE/      %                             INCREASE/       %
                                           1997       1996     (DECREASE)   CHANGE      1997       1996     (DECREASE)    CHANGE
                                           ----       ----     ----------   ------      ----       ----     ----------    ------
                                                                             ($ IN THOUSANDS)
<S>                                      <C>        <C>        <C>          <C>       <C>        <C>        <C>          <C>
Property Revenues......................  $181,095   $122,883    $58,212      47.4%    $128,128   $114,870    $ 13,258        11.5%
Interest income........................     1,390      2,348       (958)    (40.8)%        n/a        n/a         n/a         n/a
Fees from noncombined affiliates.......     1,401        886        515      58.3%         n/a        n/a         n/a         n/a
                                         --------   --------    -------     ------    --------   --------    --------    --------
        Total revenues.................   183,886    126,117     57,769      45.8%     128,128    114,870      13,258        11.5%
                                         --------   --------    -------     ------    --------   --------    --------    --------
Interest expense.......................    29,973     33,540     (3,567)    (10.6)%     23,413     30,568      (7,155)      (23.4)%
Depreciation and amortization..........    29,786     25,661      4,125      16.1%      19,418     23,182      (3,764)      (16.2)%
Property Operating Expenses............    70,061     50,893     19,168      37.7%      51,926     47,991       3,935         8.2%
General and administrative.............     8,330      5,008      3,322      66.3%         n/a        n/a         n/a         n/a
                                         --------   --------    -------     ------    --------   --------    --------    --------
        Total expenses.................   138,150    115,102     23,048      20.0%      94,757    101,741      (6,984)       (6.9)%
                                         --------   --------    -------     ------    --------   --------    --------    --------
Income before allocation to minority
  interests, income from investment in
  unconsolidated joint ventures, gain
  on sale of real estate and
  extraordinary items..................    45,736     11,015     34,721     315.2%      33,371     13,129      20,242       154.2%
Minority interests.....................    (2,899)      (468)    (2,431)    (519.4)%      (312)      (468)        156        33.3%
Income from unconsolidated joint
  ventures.............................     1,383        477        906     189.9%         559        476          83        17.4%
Gain on sale of real estate and
  extraordinary items..................   (12,930)        --    (12,930)       --      (12,876)        --     (12,876)         --
                                         --------   --------    -------     ------    --------   --------    --------    --------
Net Income.............................  $ 31,290   $ 11,024    $20,266     183.8%    $ 20,742   $ 13,137    $  7,605        57.9%
                                         ========   ========    =======     ======    ========   ========    ========    ========
Property Revenues less Property
  Operating Expenses...................  $111,034   $ 71,990    $39,044      54.2%    $ 76,202   $ 66,879    $  9,323        13.9%
                                         ========   ========    =======     ======    ========   ========    ========    ========
</TABLE>
 
     Property Revenues. The increase in rental revenues, tenant reimbursements,
parking income and other income ("Property Revenues") in the Core Portfolio
resulted from a combination of occupancy and rental rate increases. The weighted
average occupancy of the Core Portfolio increased from approximately 91.1% at
July 1, 1996 to 94.9% as of September 30, 1997. This increase represents
approximately 0.9 million square feet of additional occupancy in the Core
Portfolio between July 1, 1996 and September 30, 1997. Included in Property
Revenues for the Core Portfolio are lease termination fees of $.9 million and
$1.2 million for the three months ended September 30, 1997 and 1996,
respectively (which are included in the other revenue category on the combined
statement of operations). These fees are related to specific tenants who have
paid a fee to terminate their lease obligations before the end of the
contractual term of the lease. Although EOP Partnership has historically
experienced similar levels of such termination fees, there is no way of
predicting the timing or amounts of future lease termination fees. The
straight-line rent adjustment which is included in rental revenues for the Core
Portfolio for the three months ended September 30, 1997 and 1996, was
approximately $6.0 million and $4.4 million, respectively. The straight-line
rent adjustment which is included in rental revenues for the Total Portfolio for
the three months ended September 30, 1997 and 1996 was approximately $8.7
million and $5.2 million, respectively.
 
     Interest Income. Interest income for the Total Portfolio decreased by $.9
million to $1.4 million for the three months ended September 30, 1997, compared
to $2.3 million for the three months ended September 30, 1996. This decrease in
interest income is primarily due to having a lesser amount of cash reserves
invested in short term investments since the closing of the Consolidation and
EOP's IPO. Prior to the Consolidation, each of the entities involved in the
Consolidation needed to maintain separate cash reserves which in the aggregate
were higher than the cash reserves EOP Partnership anticipates maintaining going
forward. Due to the availability of borrowings under the $600 million Credit
Facility and other changes in the capital structure of EOP Partnership, EOP
Partnership anticipates that it will maintain cash reserves of $15 to $25
million
 
                                       77
<PAGE>   86
 
(although the cash balance may at times be more or less in anticipation of
pending acquisitions or other transactions). The lower cash balance will result
in lower interest income in future periods, however, this loss in income should
be offset by savings on the $600 million Credit Facility.
 
     Fees from Noncombined Affiliates. Although fees from noncombined affiliates
increased, they are expected to decrease in future periods as the Managed
Properties are sold. Fee income of approximately $70,900 and $238,900 for the
three months ended September 30, 1997 and 1996, respectively, was related to
properties which have been sold.
 
     Interest Expense. Interest expense decreased $3.5 million for the Total
Portfolio to $30.0 million for the three months ended September 30, 1997
compared to $33.5 million for the three months ended September 30, 1996. This
decrease was primarily the result of the repayment of approximately $598.4
million of mortgage debt in July 1997 (of which $497.6 million was secured by
properties in the Core Portfolio) and the repayment of $80 million on ZML Fund
IV's line of credit partially offset by the $180 million Private Debt Offering.
Interest expense related to the $598.4 million of secured debt repaid was
approximately $1.5 million and $10.9 million for the three months ended
September 30, 1997 and 1996, respectively. Interest expense related to ZML Fund
IV's line of credit, the $180 million Private Debt Offering and the $600 million
Credit Facility for three months ended September 30, 1997 (an equivalent amount
was not outstanding for the prior period) was approximately $.8 million, $1.1
million and $2.7 million, respectively. Due to these debt repayments, interest
expense is initially expected to decrease in future periods and then anticipated
to increase as EOP Partnership acquires additional properties and incurs
additional financing.
 
     Depreciation and Amortization. The decrease in depreciation in the Core
Portfolio resulted from the recording of EOP Partnership's assets and
liabilities at their fair market value in connection with the Consolidation and
EOP's IPO. Accordingly, certain of EOP Partnership's assets are depreciated over
longer lives than the period over which those assets were previously depreciated
by EOP Predecessors. The resulting decrease to depreciation was partially offset
by an increase to depreciation resulting from a step-up recorded to investment
in real estate, also as a result of recording those assets at their fair market
value at the time of the Consolidation and EOP's IPO. The decrease in
amortization in the Core Portfolio resulted from the write-off of deferred
financing and leasing costs at the time of the Consolidation and EOP's IPO.
 
     Property Operating Expense. The increase in real estate taxes and
insurance, repairs and maintenance, and property operating expenses ("Property
Operating Expenses") in the Core Portfolio relates primarily to increases in
real estate taxes due to higher property valuations partially offset by real
estate tax refunds recorded in the three months ended September 30, 1997.
 
     General and Administrative Expenses. General and administrative expenses
increased by approximately $3.3 million to $8.3 million for the three months
ended September 30, 1997, compared to $5.0 million for the three months ended
September 30, 1996. General and administrative expenses as a percentage of total
revenues was approximately 4.5% and 4.0% for the three months ended September
30, 1997 and 1996, respectively. The primary reasons for the increase in general
and administrative expenses are the significant increase in the size of EOP
Partnership's portfolio and increased expenses associated with becoming a public
company. While general and administrative expenses will continue to increase as
the size of EOP Partnership's portfolio increases, it is anticipated that
general and administrative expenses as a percentage of total revenue will
initially remain stable (or increase slightly), as the full costs of running a
public company are reflected in operations, and then decrease over time as EOP
Partnership realizes increased economies of scale.
 
                                       78
<PAGE>   87
 
COMPARISON OF NINE MONTHS ENDED SEPTEMBER 30, 1997 TO NINE MONTHS ENDED
SEPTEMBER 30, 1996.
 
     The table below presents selected operating information for the Total
Portfolio and for the Core Portfolio which consists of the 71 EOP Office
Properties and three EOP Parking Facilities acquired prior to January 1, 1996.
The Core Portfolio excludes Barton Oaks Plaza II, which was sold in January
1997, 8383 Wilshire, which was sold in May 1997, and 28 State Street which has
recently undergone a major redevelopment and was vacant prior to May 1997.
 
<TABLE>
<CAPTION>
                                         TOTAL PORTFOLIO                                CORE PORTFOLIO
                            -----------------------------------------      -----------------------------------------
                                                  INCREASE/      %                               INCREASE/      %
                              1997       1996     (DECREASE)   CHANGE        1997       1996     (DECREASE)   CHANGE
                              ----       ----     ----------   ------        ----       ----     ----------   ------
                                                                ($ IN THOUSANDS)
<S>                         <C>        <C>        <C>          <C>         <C>        <C>        <C>          <C>
Property Revenues.........  $489,307   $343,660    $145,647     42.4%      $340,295   $317,520    $ 22,775      7.2%
Interest income...........    10,524      6,451       4,073     63.1%           n/a        n/a         n/a      n/a
Fees from noncombined
  affiliates..............     3,841      3,126         715     22.9%           n/a        n/a         n/a      n/a
                            --------   --------    --------    ------      --------   --------    --------    -----
  Total revenues..........   503,672    353,237     150,435     42.6%       340,295    317,520      22,775      7.2%
                            --------   --------    --------    ------      --------   --------    --------    -----
Interest expense..........   106,274     87,551      18,723     21.4%        79,195     81,988      (2,793)    (3.4)%
Depreciation and
  amortization............    90,195     69,193      21,002     30.4%        64,287     62,807       1,480      2.4%
Property Operating
  Expenses................   190,170    141,823      48,347     34.1%       132,629    130,536       2,093      1.6%
General and
  administrative..........    23,056     16,278       6,778     41.6%           n/a        n/a         n/a      n/a
                            --------   --------    --------    ------      --------   --------    --------    -----
  Total expenses..........   409,695    314,845      94,850     30.1%       276,111    275,331         780      0.3%
                            --------   --------    --------    ------      --------   --------    --------    -----
Income before allocation
  to minority interests,
  income from investment
  in unconsolidated joint
  ventures, gain on sale
  of real estate and
  extraordinary items.....    93,977     38,392      55,585    144.8%        64,184     42,189      21,995     52.1%
Minority interests........    (3,778)    (2,166)     (1,612)   (74.4)%       (1,191)    (2,166)        975     45.0%
Income from unconsolidated
  joint ventures..........     3,408      1,554       1,854    119.3%         1,796      1,686         110      6.5%
Gain on sale of real
  estate and extraordinary
  items...................      (694)     5,262      (5,956)  (113.2)%      (12,876)        --     (12,876)      --
                            --------   --------    --------    ------      --------   --------    --------    -----
Net income................  $ 92,913   $ 43,042    $ 49,871    115.9%      $ 51,913   $ 41,709    $ 10,204     24.5%
                            ========   ========    ========    ======      ========   ========    ========    =====
Property Revenues less
  Property Operating
  Expenses................  $299,137   $201,837    $ 97,300     48.2%      $207,666   $186,984    $ 20,682     11.1%
                            ========   ========    ========    ======      ========   ========    ========    =====
</TABLE>
 
     Property Revenues. The increase in Property Revenues in the Core Portfolio
resulted from a combination of occupancy and rental rate increases. The weighted
average occupancy of the Core Portfolio increased from approximately 88.5% at
January 1, 1996 to 94.8% as of September 30, 1997. This increase represents
approximately 1.4 million square feet of additional occupancy in the Core
Portfolio between January 1, 1996 and September 30, 1997. Included in Property
Revenues for the Core Portfolio are lease termination fees of $3.4 million and
$4.5 million for the nine months ended September 30, 1997 and 1996, respectively
(which are included in the other revenue category on the combined statement of
operations). These fees are related to specific tenants who have paid a fee to
terminate their lease obligations before the end of the contractual term of the
lease. Although EOP Partnership has historically experienced similar levels of
such termination fees, there is no way of predicting the timing or amounts of
future lease termination fees. The straight-line rent adjustment which is
included in rental revenues for the Core Portfolio for the nine months ended
September 30, 1997 and 1996, was approximately $9.9 million and $9.9 million,
respectively. The straight-line rent adjustment which is included in rental
revenues for the Total Portfolio for the nine months ended September 30, 1997
and 1996, was approximately $16.4 million and $13.1 million, respectively.
 
                                       79
<PAGE>   88
 
     Interest Income. Interest income for the Total Portfolio increased by $4.1
million to $10.5 million for the nine months ended September 30, 1997, compared
to $6.5 million for the nine months ended September 30, 1996. This increase in
interest income is due primarily to having a larger amount of cash invested in
short term investments pending the purchase of new acquisitions. Prior to the
Consolidation, each of the entities involved in the Consolidation needed to
maintain separate cash reserves which in the aggregate were higher than cash
reserves EOP Partnership anticipates maintaining going forward. Due to the
availability of borrowings under the $600 million Credit Facility and other
changes in the capital structure of EOP Partnership, EOP Partnership anticipates
that it will maintain cash reserves of $15 to $25 million (although the cash
balance may at times be more or less in anticipation of pending acquisitions or
other transactions). The lower cash balance will result in lower interest income
in future periods, however, this loss in income should be offset by savings on
the $600 million Credit Facility.
 
     Fees from Noncombined Affiliates. Although fees from noncombined affiliates
increased, they are expected to decrease in future periods as the Managed
Properties are sold. Fee income of approximately $380,800 and $834,300 for the
nine months ended September 30, 1997 and 1996, respectively, was related to
properties which have been sold.
 
     Interest Expense. Interest expense increased $18.7 million for the Total
Portfolio to $106.3 million for the nine months ended September 30, 1997
compared to $87.6 million for the nine months ended September 30, 1996. This
increase was primarily the result of the $180 million Private Debt Offering, net
proceeds $164 million from ZML Fund IV's line of credit and the $600 million
Credit Facility (exclusive of the $80 million repaid after the closing of EOP's
IPO), and increased debt obtained to finance acquisitions. At or shortly after
the closing of EOP's IPO, EOP Partnership repaid approximately $598.4 million of
mortgage debt (of which $497.6 million was secured by properties in the Core
Portfolio) and repaid $80 million on ZML Fund IV's line of credit, partially
offsetting the increase in interest expense. Interest expense related to the
$598.4 million of secured debt repaid was approximately $25.2 million and $31.1
million for the nine months ended September 30, 1997 and 1996, respectively.
Interest expense related to ZML Fund IV's line of credit, the $180 million
Private Debt Offering and the $600 million Credit Facility for the nine months
ended September 30, 1997 (an equivalent amount was not outstanding for the prior
period) was approximately $5.2 million, $1.1 million and $2.7 million,
respectively. Due to these debt repayments, interest expense is initially
expected to decrease in future periods and then anticipated to increase as the
Company acquires additional properties and incurs additional financing.
 
     Depreciation and Amortization. Depreciation and amortization for the Core
Portfolio increased as a result of capital and tenant improvements made in 1996
and 1997 and as a result of a step-up that was recorded to investment in real
estate. This step-up was recorded as a result of adjusting the basis of EOP
Partnership's assets and liabilities to their fair market values in connection
with the Consolidation and EOP's IPO. This increase was partially offset by a
decrease resulting from certain of EOP Partnership's assets being depreciated
over longer lives than the periods over which corresponding assets were
previously depreciated by EOP Predecessors.
 
     Property Operating Expenses. The increase in Property Operating Expenses
relates primarily to an increase in maintenance expenses, offset in part by a
decrease in real estate taxes, which was caused by real estate tax refunds
related to prior periods recorded in the nine months ended September 30, 1997.
 
     General and Administrative. General and administrative expenses increased
by approximately $6.8 million to $23.7 million for the nine months ended
September 30, 1997, compared to $16.3 million for the nine months ended
September 30, 1996. General and administrative expenses as a percentage of total
revenues was approximately 4.6% and 4.6% for the nine months ended September 30,
1997 and 1996, respectively. While general and administrative expenses will
continue to increase as the size of EOP Partnership's portfolio increases, it is
anticipated that general and administrative expenses as a percentage of total
revenues will initially remain stable (or increase slightly), as the full costs
of running a public company are reflected in operations, and then decrease over
time as EOP Partnership realizes increased economies of scale.
 
                                       80
<PAGE>   89
 
PARKING OPERATIONS
 
     Included in the Total Portfolio numbers above are results of operations
from the stand alone EOP Parking Facilities, the summarized information for
which is presented below.
 
COMPARISON OF THREE MONTHS ENDED SEPTEMBER 30, 1997 TO THREE MONTHS ENDED
SEPTEMBER 30, 1996.
 
<TABLE>
<CAPTION>
                                TOTAL EOP PARKING PORTFOLIO              CORE EOP PARKING PORTFOLIO
                           -------------------------------------    -------------------------------------
                                             INCREASE/      %                         INCREASE/      %
                            1997     1996    (DECREASE)   CHANGE     1997     1996    (DECREASE)   CHANGE
                            ----     ----    ----------   ------     ----     ----    ----------   ------
                                                          ($ IN THOUSANDS)
<S>                        <C>      <C>      <C>          <C>       <C>      <C>      <C>          <C>
Property Revenues........  $6,311   $2,465     $3,846     156.0%    $2,515   $2,465     $  50        2.0%
Interest income..........      35       42         (7)    (16.7%)       --       --        --         --
                           ------   ------     ------     -----     ------   ------     -----      -----
     Total revenues......   6,346    2,507      3,839     153.1%     2,515    2,465        50        2.0%
                           ------   ------     ------     -----     ------   ------     -----      -----
Interest expense.........     475      411         64      15.8%       700      411       289       70.3%
Depreciation and
  amortization...........   1,068      333        735     220.7%       482      333       149       44.7%
Property Operating
  Expenses...............   1,071      692        379      54.8%       426      692      (266)     (38.4%)
                           ------   ------     ------     -----     ------   ------     -----      -----
     Total expenses......   2,614    1,436      1,178      82.0%     1,608    1,436       172       12.0%
                           ------   ------     ------     -----     ------   ------     -----      -----
Income before allocation
  to minority interests,
  income from investment
  in unconsolidated joint
  ventures...............   3,732    1,071      2,661     248.5%       907    1,029      (122)     (11.9%)
Minority interests.......     (79)     (43)       (36)     83.7%       (79)     (43)      (36)     (83.7%)
Income from
  unconsolidated joint
  ventures...............     825       --        825        --         --       --        --         --
                           ------   ------     ------     -----     ------   ------     -----      -----
Net Income...............  $4,478   $1,028     $3,450     335.6%    $  828   $  986     $(158)     (16.0%)
                           ======   ======     ======     =====     ======   ======     =====      =====
Property Revenues less
  Property Operating
  Expenses...............  $5,240   $1,773     $3,467     195.5%    $2,089   $1,773     $ 316       17.8%
                           ======   ======     ======     =====     ======   ======     =====      =====
</TABLE>
 
                                       81
<PAGE>   90
 
COMPARISON OF NINE MONTHS ENDED SEPTEMBER 30, 1997 TO NINE MONTHS ENDED
SEPTEMBER 30, 1996.
 
<TABLE>
<CAPTION>
                                       TOTAL EOP PARKING PORTFOLIO                  CORE EOP PARKING PORTFOLIO
                                  --------------------------------------       -------------------------------------
                                                     INCREASE/      %                            INCREASE/      %
                                   1997      1996    (DECREASE)   CHANGE        1997     1996    (DECREASE)   CHANGE
                                   ----      ----    ----------   ------        ----     ----    ----------   ------
                                                                   ($ IN THOUSANDS)
<S>                               <C>       <C>      <C>          <C>          <C>      <C>      <C>          <C>
Property Revenues...............  $16,282   $7,402     $8,880     120.0%       $7,515   $7,402     $ 113        1.5%
Interest income.................      149       95         54      56.9%           --       --        --         --
                                  -------   ------     ------     -----        ------   ------     -----      -----
    Total revenues..............   16,431    7,497      8,934     119.2%        7,515    7,402       113        1.5%
                                  -------   ------     ------     -----        ------   ------     -----      -----
Interest expense................    2,566    1,237      1,329     107.4%        1,995    1,237       758       61.3%
Depreciation and amortization...    2,703    1,000      1,703     170.3%        1,181    1,000       181       18.1%
Property Operating Expenses.....    3,458    2,319      1,139      49.1%        1,869    2,319      (450)     (19.4%)
                                  -------   ------     ------     -----        ------   ------     -----      -----
    Total expenses..............    8,727    4,556      4,171      91.6%        5,045    4,556       489       10.7%
                                  -------   ------     ------     -----        ------   ------     -----      -----
Income before allocation to
  minority interests, income
  from investment in
  unconsolidated joint
  ventures......................    7,704    2,941      4,763     162.0%        2,470    2,846      (376)     (13.2%)
Minority interests..............     (200)    (249)        49      19.7%         (200)    (249)       49       19.7%
Income from unconsolidated joint
  ventures......................    1,611       --      1,611        --            --       --        --         --
                                  -------   ------     ------     -----        ------   ------     -----      -----
Net income......................  $ 9,115   $2,692     $6,423     238.6%       $2,270   $2,597     $(327)     (12.6%)
                                  =======   ======     ======     =====        ======   ======     =====      =====
Property Revenues less Property
  Operating Expenses............  $12,824   $5,083     $7,741     152.3%       $5,646   $5,083     $ 563       11.1%
                                  =======   ======     ======     =====        ======   ======     =====      =====
</TABLE>
 
                                       82
<PAGE>   91
 
YEARS ENDED DECEMBER 31, 1996 AND 1995
 
     The table below presents selected operating information for the Total
Portfolio and for the Core Portfolio which consists of the 63 EOP Office
Properties acquired prior to January 1, 1995. The Core Portfolio for this
comparison includes Barton Oaks Plaza II and 8383 Wilshire, which were sold in
1997.
 
<TABLE>
<CAPTION>
                                         TOTAL PORTFOLIO                               CORE PORTFOLIO
                            ------------------------------------------    -----------------------------------------
                                                  INCREASE/       %                             INCREASE/      %
                              1996       1995     (DECREASE)   CHANGE       1996       1995     (DECREASE)   CHANGE
                            --------   --------   ----------   -------    --------   --------   ----------   ------
                                                               ($ IN THOUSANDS)
<S>                         <C>        <C>        <C>          <C>        <C>        <C>        <C>          <C>
Property Revenues.........  $493,396   $356,959    $136,437       38.2%   $349,810   $327,017    $ 22,793       7.0%
Interest income...........     9,608      8,599       1,009       11.7%         --         --          --        --
Fees from noncombined
  affiliates..............     5,120      5,899        (779)     (13.2%)        --         --          --        --
                            --------   --------    --------    -------    --------   --------    --------    ------
    Total revenues........   508,124    371,457     136,667       36.8%    349,810    327,017      22,793       7.0%
                            --------   --------    --------    -------    --------   --------    --------    ------
Interest expense..........   119,595    100,566      19,029       18.9%     85,225     85,371        (146)     (0.2%)
Depreciation and
  amortization............    96,237     74,156      22,081       29.8%     71,969     68,226       3,743       5.5%
Property Operating
  Expenses................  201,067     151,488      49,579       32.7%    143,511    137,103       6,408       4.7%
General and
  administrative..........    23,145     21,987       1,158        5.3%         --         --          --        --
Provision for value
  impairment..............        --     20,248     (20,248)    (100.0%)        --     20,248     (20,248)   (100.0%)
                            --------   --------    --------    -------    --------   --------    --------    ------
    Total expenses........  $440,044   $368,445    $ 71,599       19.4%   $300,705   $310,948    $(10,243)     (3.3)%
                            ========   ========    ========    =======    ========   ========    ========    ======
Income before allocation
  to minority interests,
  income from investment
  in unconsolidated joint
  ventures, gain on sale
  of real estate and
  extraordinary items.....  $ 68,080   $  3,012    $ 65,068    2,160.3%   $ 49,105   $ 16,069    $ 33,036     205.6%
Minority interests, net of
  extraordinary gain of
  $20,035 in 1995 for the
  total and core
  portfolio...............    (2,086)    (2,129)         43        2.0%     (1,733)    (2,023)        290      14.3%
Income from unconsolidated
  joint ventures..........     2,093      2,305        (212)      (9.2%)     2,093      2,305        (212)     (9.2%)
Gain on sale of real
  estate and extraordinary
  items...................     5,338     31,271     (25,933)     (82.9%)        --     31,271     (31,271)   (100.0%)
                            --------   --------    --------    -------    --------   --------    --------    ------
Net Income................  $ 73,425   $ 34,459    $ 38,966      113.1%   $ 49,465   $ 47,622    $  1,843       3.9%
                            ========   ========    ========    =======    ========   ========    ========    ======
Property Revenues less
  Property Operating
  Expenses................  $292,329   $205,471    $ 86,858       42.3%   $206,299   $189,914    $ 16,385       8.6%
                            ========   ========    ========    =======    ========   ========    ========    ======
</TABLE>
 
     Property Revenues.  The increase in Property Revenues in the Core Portfolio
resulted from a combination of occupancy and rental rate increases. The weighted
average occupancy of the Core Portfolio increased from approximately 87.5% at
January 1, 1995 to 94.3% as of December 31, 1996. This increase represents
approximately 1.3 million square feet of additional occupancy in the Core
Portfolio between January 1, 1995 and December 31, 1996. Included in Property
Revenues for the Core Portfolio are lease termination fees of $5.6 million and
$5.0 million for the years ended December 31, 1996 and 1995, respectively (these
amounts are included in the other revenue category on the combined statement of
operations). These fees are related to specific tenants who have paid a fee to
terminate their lease obligations before the end of the contractual term of the
lease. Although EOP Partnership has historically experienced similar levels of
such termination fees, there is no way of predicting the timing or amounts of
future lease termination fees. The straight-line rent adjustment which is
included in rental revenues for the Core Portfolio for the years ended December
31, 1996 and 1995, was approximately $6.2 million and $9.3 million,
respectively. The straight-line rent adjustment which is included in rental
revenues for the Total Portfolio for the years ended December 31, 1996 and 1995,
 
                                       83
<PAGE>   92
 
was approximately $18.4 million and $12.7 million, respectively. Other income
for 1996 also includes $8.8 million relating to EOP's share of a litigation
settlement.
 
     Interest Income.  Interest income for the Total Portfolio increased by $1.0
million to $9.6 million for the year ended December 31, 1996 compared to $8.6
million for the year ended December 31, 1995. This increase in interest income
is due primarily to having a larger amount of cash invested in short term
investments pending the purchase of new acquisitions. Prior to the
Consolidation, each of the entities involved in the Consolidation needed to
maintain separate cash reserves which in the aggregate were higher than cash
reserves EOP Partnership anticipates maintaining going forward. Due to the
availability of borrowings under the $600 million Credit Facility and other
changes in the capital structure of EOP Partnership, EOP Partnership anticipates
that it will maintain cash reserves of $25 to $50 million (although the cash
balance may at times be more or less in anticipation of pending acquisitions or
other transactions). The lower cash balance will result in lower interest income
in future periods, however, this loss in income should be offset by savings on
the $600 million Credit Facility.
 
     Fees from Noncombined Affiliates.  Fee income from the Managed Properties
decreased as a result of disposition activities in 1995 and 1996 which reduced
the number of properties being managed.
 
     Interest Expense.  Interest expense increased $19.0 million for the Total
Portfolio to $119.6 million for the year ended December 31, 1996 compared to
$100.6 million for the year ended December 31, 1995. This increase was primarily
the result of increased debt obtained to finance acquisitions. At or shortly
after the closing of the IPO, EOP Partnership repaid approximately $598.4
million of mortgage debt (of which $401.0 million was secured by EOP Properties
in the Core Portfolio). Interest expense related to the $598.4 million of
secured debt repaid was approximately $42.7 million and $35.9 million for the
years ended December 31, 1996 and 1995, respectively. Due to these debt
repayments, interest expense is initially expected to decrease in future periods
and then anticipated to increase as EOP Partnership acquires additional
properties and incurs additional financing.
 
     Depreciation and Amortization.  The increase in depreciation and
amortization in the Core Portfolio was related to depreciation of capital and
tenant improvements made at EOP Properties in the Core Portfolio Properties in
1995 and 1996 and the amortization of leasing commissions and loan fees paid
during that time period.
 
     Property Operating Expenses.  The increase in Property Operating Expenses
relates to an increase in maintenance expenses and to real estate tax refunds
received in 1995, with $1.9 million relating to a single property, reducing the
tax expense in 1995.
 
     General and Administrative.  General and administrative expenses increased
by approximately $1.1 million to $23.1 million for the year ended December 31,
1996 compared to $22.0 million for the year ended December 31, 1995. General and
administrative expenses as a percentage of total revenues was approximately 4.6%
and 5.9% for the years ended December 31, 1996 and 1995, respectively. While
general and administrative expenses will continue to increase as the size of EOP
Partnership's portfolio increases, it is anticipated that general and
administrative expenses as a percentage of total revenues will initially remain
stable, (or increase slightly), as the full costs of running a public company
are reflected in operations, and then decrease over time as EOP Partnership
realizes increased economies of scale.
 
     Provision for Value Impairment.  During 1995, the Financial Accounting
Standards Board issued Statement No. 121 "Accounting for the Impairment of
Long-Lived Assets to Be Disposed Of" which established accounting standards for
the evaluation of the potential impairment of such assets. This statement was
adopted by EOP Predecessors as of January 1, 1995. Rental properties are
individually evaluated for impairment when conditions exist which may indicate
that it is probable that the sum of expected future cash flows (on an
undiscounted basis) from a rental property are less than its historical net cost
basis. Upon determination that a permanent impairment has occurred, rental
properties are reduced to their fair value. As a result of cash deficits, San
Felipe Plaza was evaluated for impairment and accordingly, during the year ended
December 31, 1995, EOP Predecessors recorded a provision for value impairment of
approximately $20.2 million, of which $17.5 million related to the adjustment of
investment in real estate and approximately $2.7 million related to unamortized
lease acquisition costs.
 
                                       84
<PAGE>   93
 
YEARS ENDED DECEMBER 31, 1995 AND 1994
 
     The table below presents selected operating information for the Total
Portfolio and for the Core Portfolio which consists of the 48 EOP Office
Properties acquired prior to January 1, 1994. The Core Portfolio for this
comparison includes Barton Oaks Plaza II and 8383 Wilshire, which were sold in
1997.
 
<TABLE>
<CAPTION>
                                       TOTAL PORTFOLIO                                CORE PORTFOLIO
                          ------------------------------------------    ------------------------------------------
                                                INCREASE/       %                             INCREASE/       %
                            1995       1994     (DECREASE)   CHANGE       1995       1994     (DECREASE)   CHANGE
                          --------   --------   ----------   -------    --------   --------   ----------   -------
                                                              ($ IN THOUSANDS)
<S>                       <C>        <C>        <C>          <C>        <C>        <C>        <C>          <C>
Property Revenues.......  $356,959   $230,428    $126,531       54.9%   $235,193   $208,969    $ 26,224       12.5%
Interest income.........     8,599      4,432       4,167       94.0%         --         --          --         --
Fees from noncombined
  affiliates............     5,899      6,018        (119)      (2.0)%        --         --          --         --
                          --------   --------    --------    -------    --------   --------    --------    -------
    Total revenues......   371,457    240,878     130,579       54.2%    235,193    208,969      26,224       12.5%
                          --------   --------    --------    -------    --------   --------    --------    -------
Interest expense........   100,566     59,316      41,250       69.5%     66,856     54,674      12,182       22.3%
Depreciation and
  amortization..........    74,156     46,905      27,251       58.1%     53,202     42,402      10,800       25.5%
Property Operating
  Expenses..............  151,488     107,412      44,076       41.0%     97,071     97,772        (701)      (0.7)%
General and
  administrative........    21,987     15,603       6,384       40.9%         --         --          --         --
Provision for value
  impairment............    20,248         --      20,248         --      20,248         --      20,248         --
                          --------   --------    --------    -------    --------   --------    --------    -------
    Total expenses......  $368,445   $229,236    $139,209       60.7%   $237,377   $194,848    $ 42,529       21.8%
                          ========   ========    ========    =======    ========   ========    ========    =======
Income (loss) before
  allocation to
  minority, interests
  income from investment
  in unconsolidated
  joint ventures, gain
  on sale of real estate
  and extraordinary
  items.................  $  3,012   $ 11,642    $ (8,630)     (74.1)%  $ (2,184)  $ 14,121    $(16,305)    (115.5)%
Minority interests, net
  of extraordinary gain
  of $20,035 in 1995 for
  the total and core
  portfolio.............    (2,129)     1,437      (3,566)    (248.2)%       (19)    (2,550)      2,531       99.3%
Income from
  unconsolidated joint
  ventures..............     2,305      1,778         527       29.6%         --         --          --         --
Gain on sale of real
  estate and
  extraordinary items...    31,271      1,705      29,566    1,734.1%     31,271      1,738      29,533    1,699.3%
                          --------   --------    --------    -------    --------   --------    --------    -------
Net Income..............  $ 34,459   $ 16,562    $ 17,897      108.1%   $ 29,068   $ 13,309    $ 15,759      118.4%
                          ========   ========    ========    =======    ========   ========    ========    =======
Property Revenues less
  Property Operating
  Expenses..............  $205,471   $123,016    $ 82,455       67.0%   $138,122   $111,197    $ 26,925       24.2%
                          ========   ========    ========    =======    ========   ========    ========    =======
</TABLE>
 
     Property Revenues.  The increase in Property Revenues in the Core Portfolio
resulted from a combination of occupancy and rental rate increases. The weighted
average occupancy of the Core Portfolio increased from approximately 79.6% at
January 1, 1994 to 92.6% as of December 31, 1995. This increase represents
approximately 1.8 million square feet of additional occupancy in the Core
Portfolio between January 1, 1994 and December 31, 1995. Included in Property
Revenues for the Core Portfolio are lease termination fees of $4.3 million and
$2.0 million for the years ended December 31, 1995 and 1994, respectively (these
amounts are included in the other revenue category on the combined statement of
operations). These fees are related to specific tenants who have paid a fee to
terminate their lease obligations before the end of the contractual term of the
lease. Although EOP Partnership has historically experienced similar levels of
such termination fees, there is no way of predicting the timing or amounts of
future lease termination fees. The straight-line rent adjustment which is
included in rental revenues for the Core Portfolio for the years ended December
31, 1995 and 1994, was approximately $6.2 million and $6.0 million,
respectively. The straight-line rent adjustment
 
                                       85
<PAGE>   94
 
which is included in rental revenues for the Total Portfolio for the years ended
December 31, 1995 and 1994, was approximately $12.7 million and $6.9 million,
respectively.
 
     Interest Income.  Interest income for the Total Portfolio increased by $4.2
million to $8.6 million for the year ended December 31, 1995, compared to $4.4
million for the year ended December 31, 1994. This increase in interest income
is due primarily to having a larger amount of cash invested in short term
investments pending the purchase of new acquisitions. Prior to the
Consolidation, each of the entities involved in the Consolidation needed to
maintain separate cash reserves which in the aggregate were higher than cash
reserves EOP Partnership anticipates maintaining going forward. Due to the
availability of borrowings under the $600 million Credit Facility and other
changes in the capital structure of EOP Partnership, EOP Partnership anticipates
that it will maintain cash reserves of $25 to $50 million (although the cash
balance may at times be more or less in anticipation of pending acquisitions or
other transactions). The lower cash balance will result in lower interest income
in future periods, however, this loss in income should be offset by savings on
the $600 million Credit Facility.
 
     Fees from Noncombined Affiliates.  Management fee income from the Managed
Properties decreased by approximately $0.1 million.
 
     Interest Expense.  Interest expense increased $41.3 million for the Total
Portfolio to $100.6 million for the year ended December 31, 1995 compared to
$59.3 million for the year ended December 31, 1994. This increase was primarily
the result of increased debt obtained to finance acquisitions. At or shortly
after the closing of the IPO, EOP Partnership repaid approximately $598.4
million of mortgage debt (of which $295.1 million was secured by EOP Properties
in the Core Portfolio). Interest expense related to the $598.4 million of
secured debt repaid was approximately $35.9 million and $15.9 million for the
years ended December 31, 1995 and 1994, respectively. Due to these debt
repayments, interest expense is initially expected to decrease in future
periods, and then anticipated to increase as EOP Partnership acquires additional
properties and incurs additional financing.
 
     Depreciation and Amortization.  The increase in depreciation and
amortization in the Core Portfolio was related to depreciation of capital and
tenant improvements made at EOP Properties in the Core Portfolio Properties in
1994 and 1995 and the amortization of leasing commissions and loan fees paid
during that time period.
 
     Property Operating Expenses.  Property Operating Expenses increased by
$44.1 million, to $151.5 million for the year ended December 31, 1995 as
compared to $107.4 million for the year ended December 31, 1994. Virtually all
of this increase was attributable to EOP Properties acquired in 1994 and 1995.
The Core Portfolio had an increase of approximately $1.9 million in repairs and
maintenance expense that was offset by a $1.9 million decrease in real estate
tax and insurance expense while other property expenses decreased by $0.7
million. The decrease in real estate tax expense was mainly the result of a real
estate tax refund received due to successful appeal of the tax bills at a single
EOP Property. EOP Partnership had calculated and billed the real estate tax
reimbursement due from tenants at this EOP Property, assuming that this refund
would be received, so substantially all of the refund was retained by EOP
Partnership rather than being refunded to tenants.
 
     General and Administrative.  General and administrative expenses increased
by approximately $6.4 million to $22.0 million for the year ended December 31,
1995, compared to $15.6 million for the year ended December 31, 1994. General
and administrative expenses as a percentage of total revenues was approximately
5.9% and 6.5% for the years ended December 31, 1995 and 1994, respectively.
While general and administrative expenses will continue to increase as the size
of EOP Partnership's portfolio increases, it is anticipated that general and
administrative expenses as a percentage of total revenues will initially remain
stable, (or increase slightly), as the full costs of running a public company
are reflected in operations, and then decrease over time as EOP Partnership
realizes increased economies of scale.
 
     Provision for Value Impairment.  During 1995, the Financial Accounting
Standards Board issued Statement No. 121 "Accounting for the Impairment of
Long-Lived Assets to Be Disposed Of" which established accounting standards for
the evaluation of the potential impairment of such assets. This statement was
adopted by EOP Predecessors as of January 1, 1995. Rental properties are
individually evaluated for impairment when conditions exist which may indicate
that it is probable that the sum of expected future cash
 
                                       86
<PAGE>   95
 
flows (on an undiscounted basis) from a rental property are less than its
historical net cost basis. Upon determination that a permanent impairment has
occurred, rental properties are reduced to their fair value. As a result of cash
deficits, San Felipe Plaza was evaluated for impairment and accordingly, during
the year ended December 31, 1995, EOP Predecessors recorded a provision for
value impairment of approximately $20.2 million, of which $17.5 million related
to the adjustment of investment in real estate and approximately $2.7 million
related to unamortized lease acquisition costs.
 
PARKING FACILITIES
 
     Included in the Total Portfolio numbers above are results of operations
from EOP Parking Facilities, the summarized information for which is presented
below.
 
<TABLE>
<CAPTION>
                                                                 TOTAL PARKING PORTFOLIO
                                                                -------------------------
                                                                       YEARS ENDED
                                                                      DECEMBER 31,
                                                                -------------------------
                                                                 1996       1995     1994
                                                                -------    ------    ----
                                                                    ($ IN THOUSANDS)
<S>                                                             <C>        <C>       <C>
Property Revenues...........................................    $10,203    $5,391     --
Interest Income.............................................        141        17     --
                                                                -------    ------     --
     Total revenues.........................................     10,344     5,408     --
                                                                -------    ------     --
Interest expense............................................      1,814       937     --
Depreciation and amortization...............................      1,432       722     --
Property Operating Expenses.................................      3,152     1,797     --
                                                                -------    ------     --
     Total expenses.........................................      6,398     3,456     --
                                                                -------    ------     --
Income before allocation to minority interests and income
  from investment in unconsolidated joint ventures..........      3,946     1,952     --
Minority interests..........................................       (252)       --     --
Income from unconsolidated joint ventures...................         --        --     --
                                                                -------    ------     --
Net Income..................................................    $ 3,694    $1,952     --
                                                                =======    ======     ==
Property Revenues less Property Operating Expenses..........    $ 7,051    $3,594     --
                                                                =======    ======     ==
</TABLE>
 
DISPOSITIONS OF PROPERTY
 
     EOP Partnership sold two EOP Office Properties in 1997: Barton Oaks Plaza
II (118,529 net rentable square feet) was sold in January 1997 and 8383 Wilshire
(417,463 net rentable square feet) was sold in May 1997. In January 1996, EOP
Partnership sold the condominium portion, comprised of a 210-room hotel at Three
Lakeway, a mixed-use property. Below is a summary of the operations of these EOP
Office Properties for the three and nine month periods ended September 30, 1997
and 1996 and the years ended December 31, 1996, 1995 and 1994.
 
<TABLE>
<CAPTION>
                                        THREE MONTHS
                                            ENDED       NINE MONTHS ENDED           YEARS ENDED
                                        SEPTEMBER 30,     SEPTEMBER 30,             DECEMBER 31,
                                        -------------   ------------------   --------------------------
                                        1997    1996      1997      1996      1996     1995      1994
                                        ----   ------   --------   -------   ------   -------   -------
                                                               ($ IN THOUSANDS)
<S>                                     <C>    <C>      <C>        <C>       <C>      <C>       <C>
Property Revenues.....................  $ 42   $2,540    $ 3,227    $7,460   $9,959   $ 9,445   $ 9,041
                                        ----   ------    -------    ------   ------   -------   -------
Interest expense......................    --      149         36       808      956     4,910     4,724
Depreciation and amortization.........    --      563        451     1,678    2,286     2,262     2,044
Property Operating Expenses...........    91    1,007      1,501     3,447    4,869     3,068     5,249
                                        ----   ------    -------    ------   ------   -------   -------
          Total expenses..............    91    1,719      1,988     5,933    8,111    10,240    12,017
Income (loss) before allocation to
  minority interests, and gain on sale
  of real estate and extraordinary
  items...............................   (49)     821      1,239     1,527    1,848      (795)   (2,976)
Minority interests....................    --       --         --        --       --        --        --
Gain on sale of real estate and
  extraordinary items.................    --       --     12,962     5,262    5,338        --      (224)
                                        ----   ------    -------    ------   ------   -------   -------
Net (loss) income.....................  $(49)  $  821    $14,201    $6,789   $7,186   $  (795)  $(3,200)
                                        ====   ======    =======    ======   ======   =======   =======
Property Revenues less Property
  Operating Expenses..................  $(49)  $1,533    $ 1,726    $4,013   $5,090   $ 6,377   $ 3,792
                                        ====   ======    =======    ======   ======   =======   =======
</TABLE>
 
                                       87
<PAGE>   96
 
LIQUIDITY AND CAPITAL RESOURCES
 
     LIQUIDITY. Net cash provided from operations represents the primary source
of liquidity to fund distributions, debt service, recurring capital costs and
non-revenue enhancing tenant improvements. Historically, EOP Partnership made
annual distributions equal to approximately 100% of taxable income. Cash
generated in excess of taxable income (resulting primarily from noncash items
such as depreciation and amortization) was retained for working capital and to
fund capital improvements and non-revenue enhancing tenant improvements. EOP
Partnership intends to make regular quarterly distributions to holders of EOP
Partnership Units. EOP Partnership has established its initial distribution at
an annual rate of $1.20 per EOP Partnership Unit based upon its estimate of
annualized cash flow.
 
     EOP Partnership intends to fund recurring capital costs and non-revenue
enhancing tenant improvements from cash from operations and draws under its $600
million Credit Facility. EOP Partnership has no contractual obligations for
material capital costs, other than in connection with customary tenant
improvements in the ordinary course of business. EOP Partnership also expects
that the $600 million Credit Facility will provide for temporary working
capital, unanticipated cash needs, and funding of acquisitions.
 
     The anticipated size of EOP Partnership's distributions will not allow EOP
Partnership, using only cash from operations, to retire all of its debt as it
comes due and, therefore, EOP Partnership will be required to repay maturing
debt with funds from debt and/or equity financing.
 
     MORTGAGE FINANCING. The table below summarizes the mortgage debt, unsecured
notes and credit facility indebtedness outstanding at September 30, 1997 and
December 31, 1996 and 1995, excluding the discount on mortgage debt (net of
accumulated amortization of approximately $1.3 million) of approximately $19
million recorded in connection with EOP's IPO and Consolidation.
 
<TABLE>
<CAPTION>
                                                           September 30,   December 31,   December 31,
                                                               1997            1996           1995
Debt Summary:                                              -------------   ------------   ------------
<S>                                                        <C>             <C>            <C>
Balance ($ in thousands)
  Fixed Rate.............................................   $1,308,125      $1,304,075     $  900,913
  Variable Rate..........................................      427,368         660,817        533,914
                                                            ----------      ----------     ----------
          Total..........................................   $1,735,493      $1,964,892     $1,434,827
                                                            ==========      ==========     ==========
Percentage of Total Debt:
  Fixed Rate.............................................         75.4%           66.4%          62.8%
  Variable Rate..........................................         24.6%           33.6%          37.2%
                                                            ----------      ----------     ----------
          Total..........................................        100.0%          100.0%         100.0%
                                                            ==========      ==========     ==========
Weighted Average Interest
Rate at End of Period:
  Fixed Rate.............................................         7.56%           7.89%          8.01%
  Variable Rate..........................................         6.86%           7.33%          7.58%
                                                            ----------      ----------     ----------
          Weighted Average...............................         7.39%           7.70%          7.85%
                                                            ==========      ==========     ==========
</TABLE>
 
     The variable rate debt shown above bore interest at 30-day LIBOR-based
floating interest rate. The 30-day LIBOR at September 30, 1997 was 5.66%
resulting in a weighted average spread over LIBOR at September 30, 1997 of 1.2%.
 
     During the quarter ended September 30, 1997, EOP Partnership used the net
proceeds of EOP's IPO of approximately $564.5 million and approximately $33.9
million of available cash reserves to repay $253.1 million of fixed rate debt
and $345.3 million of the variable rate debt. An additional $12.9 million was
incurred for prepayment penalties. EOP Partnership used the $180 million of
proceeds received from the Private Debt Offering to repay a portion of the $600
million Credit Facility. The balance on the $600 million Credit Facility at
September 30, 1997 was approximately $211.1 million. The total debt outstanding
as of September 30, 1997, excluding the discount on mortgage debt (net of
accumulated amortization of approximately
 
                                       88
<PAGE>   97
 
$1.3 million) of approximately $19 million recorded in connection with EOP's IPO
and the Consolidation, will mature as follows:
 
<TABLE>
<CAPTION>
                                                                IN THOUSANDS
                                                                ------------
<S>                                                             <C>
1997........................................................     $    3,319
1998........................................................         45,218
1999........................................................        168,085
2000........................................................        357,605
2001........................................................        192,074
2002........................................................         60,333
Thereafter..................................................        908,859
                                                                 ----------
     Total..................................................     $1,735,493
                                                                 ==========
</TABLE>
 
     The instruments encumbering the EOP Properties contain customary
restrictions and requirements such as transferability restrictions, payment of
taxes on the EOP Property, maintenance of the EOP Property in good condition,
maintenance of insurance on the EOP Property, prohibition on liens, and
obtaining lender consent to leases with material tenants.
 
     LINES OF CREDIT.  ZML Fund IV entered into an acquisition/term loan
facility in September 1996 which was amended in April 1997. On July 15, 1997,
EOP Partnership obtained the $600 million Credit Facility which is used for
acquisitions and general corporate purposes. Amounts were drawn on the $600
million Credit Facility to repay the outstanding balance on ZML Fund IV's line
of credit which was terminated when the $600 million Credit Facility was
obtained. The $600 million Credit Facility matures on July 15, 2000. EOP
Partnership paid a commitment fee on the $600 million Credit Facility at closing
of approximately $645,000. In addition, until EOP Partnership receives a long
term debt rating of BBB- or Baa3 or higher by two rating agencies, an unused
commitment fee is payable quarterly in arrears based upon the unused amount of
the $600 million Credit Facility as follows: .15% per annum if the unused amount
is between 0 to 33%; .20% per annum if the unused amount is more than 33% but
less than 66%; .25% per annum if the unused amount is more than 66%. The $600
million Credit Facility carries an interest rate equal to LIBOR plus 110 basis
points. Once EOP Partnership receives the rating as described above, a
competitive bid option will become available for up to $250 million of the
facility amount. Under the competitive bid option, the interest rate spread will
be reduced on a sliding scale based upon EOP Partnership's senior unsecured debt
rating and the unused commitment fee will be replaced by a facility fee of .20%
per annum. EOP Partnership is negotiating an amendment to the $600 million
Credit Facility to reduce the interest rate to LIBOR plus 100 basis points.
There can be no assurance that the amendment will be consummated. As of November
14, 1997 the outstanding balance on the $600 million Credit Facility has been
repaid with proceeds received from the $180 million Private Debt Offering and
the $1.5 billion Credit Facility.
 
     TERM LOAN FACILITY.  In October 1997 EOP Partnership obtained the $1.5
billion Credit Facility. The $1.5 billion Credit Facility is available for the
acquisition of properties and general corporate purposes. The $1.5 billion
Credit Facility carries an interest rate equal to LIBOR plus 100 basis points
and may be increased or decreased upon the receipt of an investment grade
unsecured debt rating. The $1.5 billion Credit Facility matures on July 1, 1998,
and may be extended to October 1, 1998. EOP Partnership paid an underwriting fee
on the $1.5 billion Credit Facility at closing of approximately $4,875,000. In
addition, an unused commitment fee is payable quarterly in arrears based upon
the unused amount of the $1.5 billion Credit Facility as follows: .15% per annum
if the unused amount is between 0 to 33%; .20% per annum if the unused amount is
more than 33% but less than 66%; .25% per annum if the unused amount is greater
than 66%. In October 1997, EOP Partnership used approximately $236 million of
proceeds from the $1.5 billion Credit Facility to repay the majority of the
variable rate property mortgage indebtedness outstanding as of September 30,
1997. EOP Partnership repaid $150 million on the $1.5 billion Credit Facility
with proceeds from the $200 million private placement of Common Shares in
October 1997. Under the terms of the facility agreement any amounts repaid
cannot be drawn. In addition, amounts were drawn from the $1.5 billion Credit
Facility for property acquisitions and general corporate purposes. As of
November 14, 1997, the outstanding balance on the
 
                                       89
<PAGE>   98
 
$1.5 billion Credit Facility was approximately $1.044 billion. The amount
available to draw under the $1.5 billion Credit Facility is approximately $306
million as of November 14, 1997.
 
     UNSECURED NOTES.  In September 1997, EOP Partnership completed the Private
Debt Offering with an unaffiliated party. The terms of the Private Debt Offering
consist of four tranches with maturities from seven to ten years which were
priced at an interest rate spread over the corresponding Treasury Rate. EOP
Partnership used the proceeds of the Private Debt Offering to repay a portion of
the $600 million Credit Facility. In addition, EOP Partnership terminated $150
million of the $700 million of hedge agreements at a cost of approximately $3.9
million for the Private Debt Offering. This amount will be amortized to interest
expense over the respective terms of each tranche. A summary of the terms of the
Private Debt Offering are as follows:
 
<TABLE>
<CAPTION>
                                              STATED   EFFECTIVE
           TRANCHE                AMOUNT       RATE    RATE (A)
- -----------------------------  ------------   ------   ---------
<C>                            <C>            <C>      <C>
7 Year Senior Notes due 2004   $ 30,000,000    7.24%      7.24%
8 Year Senior Notes due 2005     50,000,000    7.36%      7.67%
9 Year Senior Notes due 2006     50,000,000    7.44%      7.73%
10 Year Senior Notes due 2007    50,000,000    7.42%      7.69%
                               ------------
                               $180,000,000
                               ============
</TABLE>
 
- ---------------
(A) Includes the cost of the terminated interest rate protection agreements.
 
     It is currently anticipated that EOP or EOP Partnership will issue
preferred shares and/or senior unsecured notes (the "Expected Offering") in
early 1998 subject to market conditions. Proceeds from the Expected Offering
would be used to repay a portion of the $1.5 billion Credit Facility. There can
be no assurance, however, that the Expected Offering will be consummated.
 
     INTEREST RATE PROTECTION AGREEMENTS.  In order to limit the market risk
associated with variable rate debt, EOP Partnership entered into several
interest rate protection agreements. These agreements effectively convert
floating rate debt to a fixed rate basis, as well as hedge anticipated financing
transactions. Net amounts paid or received under these agreements are recognized
as an adjustment to interest expense when such amounts are incurred or earned.
Settlement amounts paid or received under these agreements are deferred and
amortized over the term of the related financing transaction on the
straight-line method which approximates the effective yield method. A summary of
the various interest rate hedge agreements is as follows: (1) On June 4, 1997,
EOP Partnership entered into interest rate protection agreements for $700
million of indebtedness. As a result of this arrangement, EOP Partnership has
essentially "locked into" U.S. Treasury rates in effect as of June 4, 1997, for
$700 million in indebtedness. In August 1997, EOP Partnership terminated $150
million of the $700 million of hedge agreements at a cost of $3.9 million. The
terminated agreements pertained to the Private Debt Offering. The portion of the
Private Debt Offering protected by these agreements consisted of three tranches
with maturities of eight, nine and ten years, respectively. The cost of the
terminated hedge agreements will be amortized to interest expense over the
respective terms of each tranche. (2) On October 6, 1997, EOP Partnership
entered into an additional $450 million of interest rate protection agreements
based on the U.S. Treasury rates in effect as of that date. EOP intends to
terminate these agreements and the remaining $550 million hedge agreements
described above at such time as it incurs fixed rate indebtedness. Upon the
occurrence of such termination, EOP Partnership will either owe money or be
entitled to receive money depending on whether U.S. Treasury rates have
increased (resulting in a payment to EOP Partnership) or decreased (resulting in
a payment obligation of EOP Partnership) subsequent to the date of the hedge.
The counterparties to these arrangements are major U.S. financial institutions.
(3) EOP Predecessors entered into an interest rate swap agreement in October
1995 which effectively fixed the interest rate on a $93.6 million loan at 6.94%
through the maturity of the loan on June 30, 2000. EOP Predecessors sold several
interest rate protection agreements (aggregating $173 million of LIBOR based
agreements) in June 1997 at a cost of approximately $1.1 million.
 
                                       90
<PAGE>   99
 
     The $600 million Credit Facility, the Private Debt Offering, the $1.5
billion Credit Facility contain, and any notes issued in the Expected Offering
are expected to contain, certain customary restrictions and requirements such as
total debt to assets ratios, secured debt to total assets ratios, debt service
coverage ratios, minimum ratios of unencumbered assets to unsecured debt, and
other limitations.
 
ISSUANCE OF COMMON SHARES AND UNITS.
 
     During the period from July 11, 1997 through November 14, 1997, 5,833,682
EOP Units and 3,018,367 EOP Common Shares were issued to the sellers of certain
EOP Properties acquired during this period. An additional 121,424 EOP Common
Shares were issued as restricted share awards to officers and to trustees as
compensation. Also, EOP completed the private placement of EOP Common Shares
with an unaffiliated party, issuing 6,666,667 EOP Common Shares at $30 per
share. A portion of these funds was used to repay a portion of the $1.5 billion
Credit Facility.
 
CASH FLOWS
 
NINE MONTHS ENDED SEPTEMBER 30, 1997 AND 1996.
 
     For discussion purposes, the cash flows for the nine months ended September
30, 1997 combine the cash flows of the EOP Predecessors for the period January
1, 1997 to July 10, 1997 and the cash flows of EOP Partnership for the period
July 11, 1997 to September 30, 1997. The cash flows for the nine months ended
September 30, 1996 represent solely the cash flows of EOP Predecessors.
Consequently, the comparison of the periods provides only limited information
regarding the cash flows of EOP Partnership.
 
     Cash and cash equivalents decreased by approximately $277.8 million, to
approximately $132.6 million at September 30, 1997, compared to $410.4 million
at December 31, 1996. This decrease was the result of $155.6 million of cash
generated by operations, $404.4 million generated from financing activities
reduced by $656.7 million invested in new acquisitions, capital and tenant
improvements, and payment of leasing commissions. Net cash provided by operating
activities increased by $65.9 million from $89.7 million to $155.6 million
primarily due to the additional cash flow generated by the increase in the
number of EOP Properties owned. Net cash used for investing activities increased
by $67.4 million from $589.3 million to $656.7 million mainly due to an increase
in the amount of real estate assets purchased during the nine months ended
September 30, 1997 compared to the nine months ended September 30, 1996. Net
cash provided by financing activities decreased by $125.9 million from $530.3
million to $404.4 million due to an increase in principal payments on mortgage
notes (including the repayments of debt with proceeds received from EOP's IPO)
and the $600 million Credit Facility, and a decrease in proceeds from mortgage
notes offset in part by a decrease in capital distributions and an increase in
proceeds from the $600 million Credit Facility and unsecured notes.
 
YEARS ENDED DECEMBER 31, 1996 AND 1995.
 
     Cash and cash equivalents increased by approximately $299.3 million, to
approximately $410.4 million at December 31, 1996, compared to $111.1 million at
December 31, 1995. This increase was the result of $166 million of cash
generated by operations, $1,057.5 million generated from financing activities,
reduced by $924.2 million invested in new acquisitions, capital and tenant
improvements, and payment of leasing commissions. Net cash provided by operating
activities increased by $72.1 million from $93.9 million to $166.0 million
primarily due to the additional cash flow generated by the increase in the
number of EOP Properties owned. Net cash used for investing activities increased
by $543.6 million from $380.6 million to $924.2 million mainly due to an
increase in the amount of real estate assets purchased during 1996 compared to
1995. Net cash provided by financing activities increased by $781.1 million from
$276.5 million to $1,057.6 million due to an increase in capital contributions
and to an increase in proceeds received on mortgage notes, and a net decrease in
principal payments on mortgage notes and revolving lines of credit offset in
part by distributions to minority interest partners.
 
                                       91
<PAGE>   100
 
YEARS ENDED DECEMBER 31, 1995 AND 1994.
 
     The decrease in cash and cash equivalents of approximately $10.2 million
from December 31, 1994 to December 31, 1995 was the result of $380.6 million
invested in new acquisitions, capital and tenant improvements, and payment of
leasing commissions net of $93.9 million of cash generated by operations and
$276.5 million generated from financing activities. Net cash provided by
operating activities increased by $20.1 million from $73.8 million to $93.9
million primarily due to the additional cash flow generated by the increase in
the number of EOP Properties owned. Net cash used for investing activities
decreased by $133.4 million from $514.0 million to $380.6 million mainly due to
a decrease in escrow deposits and restricted cash in 1995 and investment in an
unconsolidated joint venture in 1994. Net cash provided by financing activities
decreased by $238.4 million from $514.9 million to $276.5 million primarily due
to principal payments on mortgage notes and revolving lines of credit, offset in
part by increased capital contributions.
 
CAPITAL IMPROVEMENTS
 
     EOP Partnership has a history of acquiring and repositioning
undercapitalized and poorly managed properties, many of which have required
significant capital improvements due to deferred maintenance and/or required
substantial renovation to enable them to compete effectively. A number of the
EOP Properties also have had significant amounts of shell space requiring build
out at the time of acquisition. EOP Partnership takes these capital improvements
and revenue enhancing tenant improvements into consideration at the time of
acquisition in determining the amount of equity and debt financing required to
purchase the EOP Property and fund the improvements. Therefore, capital
improvements up to the first five years after acquisition of these EOP
Properties are treated separately from typical recurring capital expenditures,
non-revenue enhancing tenant improvements and leasing commissions required once
these EOP Properties have reached stabilized occupancy, and deferred maintenance
and renovations planned at the time of acquisition have been completed. Capital
improvements (including tenant improvements and leasing commissions for shell
space) for the nine months ended September 30, 1997 and the years ended December
31, 1996, 1995 and 1994 were approximately $57.0 million, $100.3 million, $48.8
million and $49.7 million, respectively or $1.71, $3.49, $2.16 and $2.76 per
square foot, respectively. These amounts include approximately $27.8 million,
$47.3 million and $16.8 million for the nine months ended September 30, 1997 and
the years ended December 31, 1996 and 1995, respectively, for the redevelopment
of the 28 State Street Building.
 
     EOP Partnership considers capital expenditures to be recurring expenditures
relating to the on-going maintenance of the EOP Office Properties. The table
below summarizes capital expenditures for the nine months ended September 30,
1997 and the years ended December 31, 1996, 1995 and 1994. The capital
expenditures set forth below are not necessarily indicative of future capital
expenditures.
 
<TABLE>
<CAPTION>
                                                      1997
                                                    (THROUGH
                                                    SEPT. 30)    1996     1995     1994
                                                    ---------    -----    -----    -----
<S>                                                 <C>          <C>      <C>      <C>
Number of EOP Office Properties...................       93         81       71       61
Rentable Square Feet (in millions)................     33.4       28.7     22.6     18.0
Annual Capital Expenditures per square foot.......    $ .07      $ .16    $ .14    $ .32
</TABLE>
 
TENANT IMPROVEMENTS AND LEASING COMMISSION COSTS
 
     EOP Partnership distinguishes its tenant improvements and leasing
commissions between those that are revenue enhancing (which are required for
space which is vacant at the time of acquisition or that has been vacant for
nine months or more) and non-revenue enhancing (which are required to maintain
the revenue being generated from currently leased space). The table below
summarizes the revenue enhancing and non-revenue enhancing tenant improvements
and leasing commissions for the nine months ended September 30, 1997 and the
years ended December 31, 1996, 1995 and 1994. The tenant improvement and leasing
commission costs set forth below are presented on an aggregate basis and do not
reflect significant regional
 
                                       92
<PAGE>   101
 
variations and, in any event, are not necessarily indicative of future tenant
improvement and leasing commission costs:
 
<TABLE>
<CAPTION>
                                               FOR THE NINE
                                               MONTHS ENDED                   YEARS ENDED DECEMBER 31,
                                               SEPTEMBER 30,            ------------------------------------
                                                   1997                  1996            1995         1994
                                            -------------------         -------         -------      -------
<S>                                         <C>                         <C>             <C>          <C>
Number of EOP Office Properties...........             93                    81              71           61
Rentable square feet (in millions)........           33.4                  28.7            22.6         18.0
Revenue enhancing tenant improvements and
  leasing commissions
  Amounts (in thousands)..................        $ 6,930               $31,534         $20,981      $16,975
  Per square foot improved................        $ 15.90(1)            $ 30.26(3)      $ 22.89      $ 14.14
  Per total square foot...................        $   .28(1)(2)         $  1.10(3)      $   .93      $   .94
Non-revenue enhancing tenant improvements
  and leasing commissions:
Renewal space
  Amounts (in thousands)..................        $ 7,553               $15,486         $10,008      $11,095
  Per square foot improved................        $  6.02(1)            $  6.79(3)      $  7.82      $  5.41
  Per total square foot...................        $   .31(1)(2)         $   .54(3)      $   .44      $   .62
Retenanted space
  Amounts (in thousands)..................        $10,689               $31,987         $ 8,446      $ 8,996
  Per square foot improved................        $ 13.93(1)            $ 20.64(3)      $ 19.80      $ 15.08
  Per total square foot...................        $   .43(1)(2)         $  1.11(3)      $   .37      $   .50
                                                  -------               -------         -------      -------
Total non-revenue enhancing (in
  thousands)..............................        $18,242               $47,473         $18,454      $20,061
Per square foot improved..................        $  9.02(1)            $ 12.39         $ 10.81      $  7.58
Per total square foot.....................        $   .74(1)(2)         $  1.65         $   .81      $  1.12
</TABLE>
 
- ---------------
(1) The per square foot calculations as of September 30, 1997 are calculated
    taking the total dollars anticipated to be expended on tenant improvements
    in process as of September 30, 1997, divided by the total square footage
    being improved or total building square footage. The actual amounts expended
    as of September 30, 1997 for revenue enhancing and non-revenue enhancing
    renewal and released space were $8.7 million, $7.5 million and $21.5
    million, respectively.
 
(2) The amounts shown have been annualized to reflect a full year of comparable
    operation. The actual costs per total square foot as of September 30, 1997
    for revenue enhancing and non-revenue enhancing renewal and released space
    were $.21, $.23 and $.32, respectively.
 
(3) The per square foot calculations as of December 31, 1996 are calculated
    taking the total dollars anticipated to be expended on tenant improvements
    in process at December 31, 1996, divided by the total square footage being
    improved or total building square footage. The actual amounts expended as of
    December 31, 1996 for revenue enhancing and non-revenue enhancing renewal
    and retenanted space were approximately $30.6 million and $14.6 million and
    $20.8 million, respectively.
 
INFLATION
 
     Substantially all of the office leases require the tenant to pay, as
additional rent, a portion of any increases in real estate taxes and operating
expenses over a base amount. In addition, many of the office leases provide for
fixed increases in base rent or indexed calculations (based on the Consumer
Price Index or other measures). EOP Partnership believes that inflationary
increases in expenses will be offset, in part, by the expense reimbursements and
contractual rent increases described above.
 
                                       93
<PAGE>   102
 
FUNDS FROM OPERATIONS
 
     Management of EOP Partnership believes Funds from Operations, as defined by
the National Association of Real Estate Investment Trusts, Inc. ("NAREIT"), to
be an appropriate measure of performance for an equity REIT. While Funds from
Operations is a relevant and widely used measure of operating performance of
equity REITs, it does not represent cash flow from operations or net income as
defined by GAAP, and it should not be considered as an alternative to these
indicators in evaluating liquidity or operating performance of EOP Partnership.
 
     The following table reflects the calculation of EOP Partnership's and EOP
Predecessor's combined Funds from Operations for the nine month ended September
30, 1997 and 1996 and EOP Predecessor's Funds from Operations for the years
ended December 31, 1996, 1995 and 1994 on an historical cost basis:
 
<TABLE>
<CAPTION>
                                                       NINE MONTHS ENDED
                                                         SEPTEMBER 30,            YEARS ENDED DECEMBER 31,
                                                     ---------------------   ----------------------------------
                                                       1997        1996         1996        1995        1994
                                                     ---------   ---------   ----------   ---------   ---------
                                                                           (IN THOUSANDS)
<S>                                                  <C>         <C>         <C>          <C>         <C>
Income before income from investment in
  unconsolidated joint ventures, gain on sale of
  real estate, extraordinary items and minority
  interest.........................................  $  93,977   $  38,392   $   68,080   $   3,012   $  11,642
Add back (deduct):
  (Income) allocated to minority interests.........     (1,191)     (2,166)      (2,086)     (2,129)      1,437
  Income from investment in unconsolidated joint
    ventures.......................................      3,408       1,554        2,093       2,305       1,778
  Provision for value impairment...................         --          --           --      20,248          --
  Depreciation and amortization (real estate
    related).......................................     85,709      66,018       92,373      72,668      45,515
  Amortization of loan discount....................      1,267          --           --          --          --
                                                     ---------   ---------   ----------   ---------   ---------
Funds from Operations before effect of adjusting
  straight-time rental revenue and expense included
  in Funds from Operations to a cash basis(1)......    183,170     103,798      160,460      96,104      60,372
                                                     ---------   ---------   ----------   ---------   ---------
  Deferred rental revenue..........................    (16,395)    (13,140)     (18,427)    (12,663)     (6,883)
  Deferred rental expense..........................      1,647          --          788          --          --
                                                     ---------   ---------   ----------   ---------   ---------
Funds from Operations excluding straight-time
  rental revenue and expense adjustments...........  $ 168,422   $  90,658   $  142,821   $  83,441   $  53,489
                                                     =========   =========   ==========   =========   =========
Cash Flow Provided by (Used for):
  Operating Activities.............................  $ 155,625   $  89,685   $  165,975   $  93,878   $  73,821
  Investing Activities.............................   (656,702)   (589,340)    (924,227)   (380,615)   (513,965)
  Financing Activities.............................    404,444     530,280    1,057,551     276,513     514,923
</TABLE>
 
- ---------------
 
(1) The White Paper on Funds from Operations approved by the Board of Governors
    of NAREIT in March 1995 defines Funds from Operations as net income (loss)
    (computed in accordance with GAAP), excluding gains (or losses) from debt
    restructuring and sales of properties, plus real estate related depreciation
    and amortization and after adjustments for unconsolidated partnerships and
    joint ventures. EOP Partnership believes that Funds from Operations is
    helpful to investors as a measure of the performance of an equity REIT
    because, along with cash flow from operating activities, financing
    activities and investing activities, it provides investors with an
    indication of the ability of EOP Partnership to incur and service debt, to
    make capital expenditures and to fund other cash needs. EOP Partnership
    computes Funds from Operations in accordance with standards established by
    NAREIT which may not be comparable to Funds from Operations reported by
    other REITs that do not define the term in accordance with the current
    NAREIT definition or that interpret the current NAREIT definition
 
                                       94
<PAGE>   103
 
    differently than EOP Partnership. Funds from Operations does not represent
    cash generated from operating activities in accordance with GAAP and should
    not be considered as an alternative to net income (determined in accordance
    with GAAP) as an indication of EOP Partnership's financial performance or to
    cash flow from operating activities (determined in accordance with GAAP) as
    a measure of EOP Partnership's liquidity, nor or is it indicative of funds
    available to fund EOP Partnership's cash needs, including its ability to
    make cash distributions.
 
                                       95
<PAGE>   104
 
                               THE EOP PROPERTIES
 
GENERAL
 
     EOP believes it controls the largest portfolio of office properties of any
publicly traded, full service office company in the United States. Management
believes that the EOP Properties are generally well located in markets that
exhibit strong growth characteristics, are well maintained and professionally
managed, and are generally capable of attracting and retaining high quality
tenants while maintaining high rent, occupancy and tenant retention rates.
 
     All EOP Property data is as of September 30, 1997.
 
                        EOP OFFICE PROPERTIES BY REGION
<TABLE>
<CAPTION>
 
                                                  PERCENTAGE                                                   ANNUALIZED
                                                   OF TOTAL                                                       NET
                                                    OFFICE                               PERCENTAGE            EFFECTIVE
                                                  PORTFOLIO                                  OF                 RENT PER
                          NUMBER      RENTABLE     RENTABLE                              PORTFOLIO    NUMBER    OCCUPIED
                            OF         SQUARE       SQUARE     PERCENTAGE   ANNUALIZED   ANNUALIZED     OF       SQUARE
REGION                  PROPERTIES      FEET         FEET       OCCUPIED     RENT(1)        RENT      LEASES    FOOT(2)
- ------                  ----------   ----------   ----------   ----------   ----------   ----------   ------   ----------
                                                                             ($000S)
<S>                     <C>          <C>          <C>          <C>          <C>          <C>          <C>      <C>
Pacific...............      18        6,750,743      20.2%        93.4%      $145,966       23.2%       534      $12.37
Southeast.............      14        5,008,447      15.0         96.3         92,790       14.7        401       11.03
Northeast.............      17        5,163,207      15.5         93.2        120,711       19.2        423       13.48
Central...............      11        6,548,111      19.6         90.0        119,707       19.0        498        8.86
Southwest.............      14        5,748,105      17.2         92.5         86,227       13.7        612        7.89
West..................      19        4,188,364      12.5         95.5         64,264       10.2        631        8.49
                            --       ----------     -----        -----       --------      -----      -----      ------
    Total/Weighted
      Average.........      93       33,406,977     100.0%        93.2%      $629,667      100.0%     3,099      $10.41
                            ==       ==========     =====                    ========      =====      =====
 
<CAPTION>
                        ANNUALIZED
                         RENT PER
                         OCCUPIED
                          SQUARE
                           FOOT       ANNUALIZED
                           AS OF       RENT PER     MARKET
                         1/1/93 OR     OCCUPIED    RENT PER
                        ACQUISITION     SQUARE      SQUARE
REGION                    DATE(3)      FOOT(1)     FOOT(4)
- ------                  -----------   ----------   --------
<S>                     <C>           <C>          <C>
Pacific...............     $22.79       $23.16      $29.55
Southeast.............      17.91        19.23       21.65
Northeast.............      20.30        25.09       27.84
Central...............      20.30        20.31       23.35
Southwest.............      15.62        16.22       17.84
West..................      14.48        16.07       20.43
                           ------       ------      ------
    Total/Weighted
      Average.........     $18.91       $20.22      $23.75
</TABLE>
 
- ---------------
(1) Annualized Rent is the monthly contractual rent under existing leases as of
    September 30, 1997, multiplied by 12. This amount reflects total rent before
    any rent abatements and includes expense reimbursements, which may be
    estimates as of such date. Total rent abatements for leases in effect as of
    September 30, 1997, for the 12 months ending September 30, 1998 are
    approximately $6.9 million.
 
(2) Annualized Net Effective Rent is calculated for leases in effect as of
    September 30, 1997 as follows: Annualized Rent, calculated as described
    above, was reduced to reflect the annualized costs of tenant improvements
    and leasing commissions, if any, paid or payable by EOP with respect to
    leases entered into subsequent to the later of 1991 or the date of
    acquisition of the relevant EOP Property (calculated by dividing the total
    tenant improvements and leasing commissions for a given lease by the term of
    that lease in months and multiplying the result by 12). Finally, the result
    of this calculation was reduced by the estimated operating expenses per
    square foot, based on 1996 actual operating expense for Properties owned as
    of January 1, 1996 and based on EOP's estimate of annual operating expense
    for EOP Properties acquired subsequent to January 1, 1996.
 
(3) Represents the gross rental rate per occupied square foot as of the later of
    January 1, 1993, or the date of acquisition for Properties acquired after
    January 1, 1993, calculated by annualizing the rent under existing leases as
    of that date. The weighted average for each region represents the weighted
    average gross rental rate per occupied square foot for each EOP Property
    multiplied by the rentable square feet for each EOP Property divided by the
    total rentable square feet per region.
 
(4) Represents the average asking gross rental rate per rentable square foot for
    selected buildings which EOP deems to be of comparable size, class, location
    and age based upon information obtained from CB Commercial Real Estate
    Group, Inc./Torto Wheaton Research, Baxter Southwest and Jamison Research,
    Inc., as of June 30, 1997.
 
                                       96
<PAGE>   105
 
               EOP OFFICE PROPERTY MARKET SECTORS AND SUBMARKETS
                         EOP OFFICE PROPERTY STATISTICS
<TABLE>
<CAPTION>
 
                                                                 PERCENTAGE
                                                                  OF TOTAL
                                                                   OFFICE                               PERCENTAGE
                                                                 PORTFOLIO                                  OF
                                         NUMBER      RENTABLE     RENTABLE                              PORTFOLIO    NUMBER
OFFICE PROPERTIES                          OF         SQUARE       SQUARE     PERCENTAGE   ANNUALIZED   ANNUALIZED     OF
(MARKET, SUBMARKET)                    PROPERTIES      FEET         FEET       OCCUPIED     RENT(1)        RENT      LEASES
- -------------------                    ----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                                    <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                                                                            ($000S)
PACIFIC REGION
Los Angeles
  Downtown...........................       1        1,329,809       4.0%        87.8%      $ 25,178        4.0%        31
  Pasadena...........................       2          439,367       1.3         84.6         10,328        1.6         31
Orange County
  Central Orange.....................       2          657,512       2.0         96.0         11,233        1.8         73
  Irvine/Airport.....................       2          586,544       1.8         94.3         11,799        1.9         74
San Diego
  La Jolla...........................       6          823,418       2.5         94.5         18,286        2.9        104
San Francisco
  Downtown...........................       5        2,914,093       8.7         96.1         69,142       11.0        221
                                           --       ----------     -----        -----       --------      -----      -----
     Pacific Region Total/Weighted
       Average.......................      18        6,750,743      20.2%        93.4%      $145,966       23.2%       534
SOUTHEAST REGION
Ft. Lauderdale
  Downtown...........................       1          225,500       0.7%        99.0%      $  5,930        0.9%        21
Orlando
  Downtown...........................       1          640,385       1.9         93.3         14,506        2.3         45
Palm Beach County, FL
  West Palm Beach....................       1          215,104       0.6         86.1          3,563        0.6         35
Sarasota
  Downtown...........................       1          247,891       0.7         95.0          4,238        0.7         35
Tampa
  Westshore..........................       2          470,331       1.4         99.2          8,113        1.3         59
 
<CAPTION>
                                                    ANNUALIZED
                                                     RENT PER
                                       ANNUALIZED    OCCUPIED
                                          NET         SQUARE
                                       EFFECTIVE       FOOT       ANNUALIZED
                                        RENT PER       AS OF       RENT PER     MARKET
                                        OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
OFFICE PROPERTIES                        SQUARE     ACQUISITION     SQUARE      SQUARE
(MARKET, SUBMARKET)                     FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- -------------------                    ----------   -----------   ----------   --------
<S>                                    <C>          <C>           <C>          <C>
 
PACIFIC REGION
Los Angeles
  Downtown...........................    $10.75        $22.08       $21.56      $25.86
  Pasadena...........................     17.70         27.79        27.78       25.22
Orange County
  Central Orange.....................      8.90         20.35        17.80       19.90
  Irvine/Airport.....................     13.07         20.78        21.32       24.22
San Diego
  La Jolla...........................     14.41         20.13        23.50       24.30
San Francisco
  Downtown...........................     12.43         24.07        24.70       36.63
                                         ------        ------       ------      ------
     Pacific Region Total/Weighted
       Average.......................    $12.37        $22.79       $23.16      $29.55
SOUTHEAST REGION
Ft. Lauderdale
  Downtown...........................    $15.42        $17.45       $26.56      $24.57
Orlando
  Downtown...........................     14.82         23.99        24.29       23.63
Palm Beach County, FL
  West Palm Beach....................      6.34         18.90        19.24       24.49
Sarasota
  Downtown...........................      9.10         17.47        18.00       15.50
Tampa
  Westshore..........................      8.78         18.79        17.38       20.58
</TABLE>
 
                                       97
<PAGE>   106
<TABLE>
<CAPTION>
 
                                                                 PERCENTAGE
                                                                  OF TOTAL
                                                                   OFFICE                               PERCENTAGE
                                                                 PORTFOLIO                                  OF
                                         NUMBER      RENTABLE     RENTABLE                              PORTFOLIO    NUMBER
OFFICE PROPERTIES                          OF         SQUARE       SQUARE     PERCENTAGE   ANNUALIZED   ANNUALIZED     OF
(MARKET, SUBMARKET)                    PROPERTIES      FEET         FEET       OCCUPIED     RENT(1)        RENT      LEASES
- -------------------                    ----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                                    <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                                                                            ($000S)
Atlanta
  Midtown............................       1          770,840       2.3%        95.8%      $ 16,394        2.6%        25
  North Central......................       2          612,733       1.8         96.8         11,834        1.9         74
  Northwest..........................       2          641,263       1.9         95.0         12,466        2.0         41
Charlotte
  Downtown...........................       1          581,666       1.7        100.0          6,897        1.1          9
Raleigh/Durham
  Durham.............................       1          181,221       0.5         98.6          3,260        0.5         35
Nashville
  Downtown...........................       1          421,513       1.3         98.4          5,590        0.9         22
                                           --       ----------     -----        -----       --------      -----      -----
     Southeast Region Total/Weighted
       Average.......................      14        5,008,447      15.0%        96.3%      $ 92,790       14.7%       401
NORTHEAST REGION
Fairfield County, CT
  Shelton............................       1          159,848       0.5%        94.1%      $  2,199        0.3%        12
  Stamford...........................       7        1,651,856       4.9         98.2         40,323        6.4        121
Washington, D.C.
  Downtown...........................       2          408,286       1.2         98.5         11,604        1.8         46
Boston
  Downtown...........................       1          570,040       1.7         56.0         10,687        1.7         11
New York
  Midtown............................       1          562,567       1.7        100.0         16,718        2.7         28
Philadelphia
  Downtown...........................       1          681,289       2.0         94.8         13,044        2.1         71
Norfolk
  Downtown...........................       1          403,276       1.2         95.4          6,354        1.0         53
 
<CAPTION>
                                                    ANNUALIZED
                                                     RENT PER
                                       ANNUALIZED    OCCUPIED
                                          NET         SQUARE
                                       EFFECTIVE       FOOT       ANNUALIZED
                                        RENT PER       AS OF       RENT PER     MARKET
                                        OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
OFFICE PROPERTIES                        SQUARE     ACQUISITION     SQUARE      SQUARE
(MARKET, SUBMARKET)                     FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- -------------------                    ----------   -----------   ----------   --------
<S>                                    <C>          <C>           <C>          <C>
 
Atlanta
  Midtown............................    $13.84        $21.98       $22.19      $21.77
  North Central......................     12.01         19.07        19.94       24.44
  Northwest..........................     13.15         18.83        20.47       24.14
Charlotte
  Downtown...........................      6.64         11.04        11.86       17.56
Raleigh/Durham
  Durham.............................      9.86         13.37        18.25       19.62
Nashville
  Downtown...........................      6.03          8.58        13.47       18.93
                                         ------        ------       ------      ------
     Southeast Region Total/Weighted
       Average.......................     11.03        $17.91       $19.23      $21.65
NORTHEAST REGION
Fairfield County, CT
  Shelton............................    $ 5.95        $14.11       $14.62      $24.66
  Stamford...........................     13.12         24.37        24.85       27.56
Washington, D.C.
  Downtown...........................     16.07         23.22        28.85       28.79
Boston
  Downtown...........................     16.40            --        33.48       36.46
New York
  Midtown............................     15.06         28.01        29.72       36.59
Philadelphia
  Downtown...........................     11.47         20.14        20.21       18.71
Norfolk
  Downtown...........................      7.03         14.19        16.52       16.40
</TABLE>
 
                                       98
<PAGE>   107
<TABLE>
<CAPTION>
 
                                                                 PERCENTAGE
                                                                  OF TOTAL
                                                                   OFFICE                               PERCENTAGE
                                                                 PORTFOLIO                                  OF
                                         NUMBER      RENTABLE     RENTABLE                              PORTFOLIO    NUMBER
OFFICE PROPERTIES                          OF         SQUARE       SQUARE     PERCENTAGE   ANNUALIZED   ANNUALIZED     OF
(MARKET, SUBMARKET)                    PROPERTIES      FEET         FEET       OCCUPIED     RENT(1)        RENT      LEASES
- -------------------                    ----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                                    <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                                                                            ($000S)
Northern Virginia
  Reston.............................       3          726,045       2.2         99.7         19,783        3.1         81
                                           --       ----------     -----        -----       --------      -----      -----
     Northeast Region Total/Weighted
       Average.......................      17        5,163,207      15.5%        93.2%      $120,711       19.2%       423
CENTRAL REGION
Chicago
  Downtown...........................       3        2,554,062       7.6%        88.2%      $ 47,913        7.6%       226
  O'Hare.............................       1          133,876       0.4         99.1          2,173        0.3         15
  East-West Corridor.................       1          772,928       2.3         86.6         17,335        2.8         53
Indianapolis
  Downtown...........................       2        1,057,877       3.2         91.7         19,092        3.0         81
Cleveland
  Downtown...........................       1        1,242,144       3.7         93.3         17,965        2.9         34
Columbus
  Downtown...........................       1          407,472       1.2         87.1          8,561        1.4         28
  Worthington........................       2          379,752       1.1         93.4          6,667        1.1         61
                                           --       ----------     -----        -----       --------      -----      -----
     Central Region Total/Weighted
       Average.......................      11        6,548,111      19.6%        90.0%      $119,707       19.0%       498
SOUTHWEST REGION
New Orleans
  Downtown...........................       2        1,164,871       3.5%        82.4%      $ 15,930        2.5%        54
  Metairie...........................       3        1,192,828       3.6         95.7         17,030        2.7        188
Austin
  Downtown...........................       3        1,423,948       4.3         94.4         25,598        4.1        130
Houston
  Galleria...........................       1          959,466       2.9         94.6         14,610        2.3        129
  North/Airport......................       2          402,709       1.2         97.5          5,440        0.9         27
San Antonio
  Airport............................       1          194,398       0.6         97.8          2,548        0.4         21
 
<CAPTION>
                                                    ANNUALIZED
                                                     RENT PER
                                       ANNUALIZED    OCCUPIED
                                          NET         SQUARE
                                       EFFECTIVE       FOOT       ANNUALIZED
                                        RENT PER       AS OF       RENT PER     MARKET
                                        OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
OFFICE PROPERTIES                        SQUARE     ACQUISITION     SQUARE      SQUARE
(MARKET, SUBMARKET)                     FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- -------------------                    ----------   -----------   ----------   --------
<S>                                    <C>          <C>           <C>          <C>
 
Northern Virginia
  Reston.............................     17.14         24.29        27.32       30.00
                                         ------        ------       ------      ------
     Northeast Region Total/Weighted
       Average.......................    $13.48        $20.30       $25.09      $27.84
CENTRAL REGION
Chicago
  Downtown...........................    $ 5.93        $23.72       $21.26      $24.35
  O'Hare.............................      6.05         21.52        16.38       19.27
  East-West Corridor.................     17.15         26.21        25.90       27.21
Indianapolis
  Downtown...........................      9.29         15.94        19.69       21.43
Cleveland
  Downtown...........................      7.64         13.18        15.50       21.60
Columbus
  Downtown...........................     15.22         22.96        24.11       24.12
  Worthington........................      9.30         17.48        18.79       20.49
                                         ------        ------       ------      ------
     Central Region Total/Weighted
       Average.......................    $ 8.86        $20.30       $20.31      $23.35
SOUTHWEST REGION
New Orleans
  Downtown...........................    $10.27        $16.60       $16.60      $15.49
  Metairie...........................      7.39         13.25        14.93       18.06
Austin
  Downtown...........................      8.64         17.84        19.04       21.36
Houston
  Galleria...........................      7.24         17.24        16.10       16.82
  North/Airport......................      5.38         12.86        13.86       16.28
San Antonio
  Airport............................      5.36         11.55        13.40       16.27
</TABLE>
 
                                       99
<PAGE>   108
<TABLE>
<CAPTION>
 
                                                                 PERCENTAGE
                                                                  OF TOTAL
                                                                   OFFICE                               PERCENTAGE
                                                                 PORTFOLIO                                  OF
                                         NUMBER      RENTABLE     RENTABLE                              PORTFOLIO    NUMBER
OFFICE PROPERTIES                          OF         SQUARE       SQUARE     PERCENTAGE   ANNUALIZED   ANNUALIZED     OF
(MARKET, SUBMARKET)                    PROPERTIES      FEET         FEET       OCCUPIED     RENT(1)        RENT      LEASES
- -------------------                    ----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                                    <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                                                                            ($000S)
  Northwest..........................       2          409,885       1.2         92.5          5,071        0.8         63
                                           --       ----------     -----        -----       --------      -----      -----
     Southwest Region Total/Weighted
       Average.......................      14        5,748,105      17.2%        92.5%      $ 86,227       13.7%       612
WEST REGION
Phoenix
  Central Corridor...................       2          605,295       1.8%        98.4%      $  7,408        1.2%        10
Denver
  Southeast/Denver Tech Center.......       3          671,659       2.0         97.0         11,716        1.9         66
St. Louis
  Clayton............................       1          339,163       1.1         98.5          7,457        1.2         34
Albuquerque
  Downtown...........................       1          230,022       0.7         94.7          3,330        0.5         32
Oklahoma City
  Northwest..........................       3          261,324       0.8         95.7          2,293        0.4        110
Dallas
  LBJ Corridor.......................       2          740,899       2.2         95.1         11,142        1.8         97
  North Central......................       1          379,556       1.1         92.7          4,771        0.8         75
  Preston Center.....................       4          721,351       2.2         92.4         13,453        2.1        144
 
<CAPTION>
                                                    ANNUALIZED
                                                     RENT PER
                                       ANNUALIZED    OCCUPIED
                                          NET         SQUARE
                                       EFFECTIVE       FOOT       ANNUALIZED
                                        RENT PER       AS OF       RENT PER     MARKET
                                        OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
OFFICE PROPERTIES                        SQUARE     ACQUISITION     SQUARE      SQUARE
(MARKET, SUBMARKET)                     FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- -------------------                    ----------   -----------   ----------   --------
<S>                                    <C>          <C>           <C>          <C>
 
  Northwest..........................      6.12         12.88        13.37       16.27
                                         ------        ------       ------      ------
     Southwest Region Total/Weighted
       Average.......................    $ 7.89        $15.62       $16.22      $17.84
WEST REGION
Phoenix
  Central Corridor...................    $ 9.34        $12.23       $12.44      $20.15
Denver
  Southeast/Denver Tech Center.......      8.94         15.41        17.99       22.66
St. Louis
  Clayton............................     12.95         19.81        22.33       23.57
Albuquerque
  Downtown...........................      5.73         16.47        15.29       17.09
Oklahoma City
  Northwest..........................      2.97          8.41         9.17       12.50
Dallas
  LBJ Corridor.......................      7.01         14.72        15.81       21.51
  North Central......................      4.77         11.74        13.56       19.68
  Preston Center.....................     13.07         17.03        20.19       22.89
</TABLE>
 
                                       100
<PAGE>   109
<TABLE>
<CAPTION>
 
                                                                 PERCENTAGE
                                                                  OF TOTAL
                                                                   OFFICE                               PERCENTAGE
                                                                 PORTFOLIO                                  OF
                                         NUMBER      RENTABLE     RENTABLE                              PORTFOLIO    NUMBER
OFFICE PROPERTIES                          OF         SQUARE       SQUARE     PERCENTAGE   ANNUALIZED   ANNUALIZED     OF
(MARKET, SUBMARKET)                    PROPERTIES      FEET         FEET       OCCUPIED     RENT(1)        RENT      LEASES
- -------------------                    ----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                                    <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                                                                            ($000S)
Ft. Worth
  West/Southwest.....................       2          239,095       0.7%        94.8%         2,694        0.4%        63
                                           --       ----------     -----        -----       --------      -----      -----
     West Region Total/Weighted
       Average.......................      19        4,188,364      12.5%        95.5%      $ 64,264       10.2%       631
                                           --       ----------     -----        -----       --------      -----      -----
     Total...........................      93       33,406,977     100.0%        93.2%      $629,667      100.0%     3,099
                                           ==       ==========     =====        =====       ========      =====      =====
 
<CAPTION>
                                                    ANNUALIZED
                                                     RENT PER
                                       ANNUALIZED    OCCUPIED
                                          NET         SQUARE
                                       EFFECTIVE       FOOT       ANNUALIZED
                                        RENT PER       AS OF       RENT PER     MARKET
                                        OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
OFFICE PROPERTIES                        SQUARE     ACQUISITION     SQUARE      SQUARE
(MARKET, SUBMARKET)                     FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- -------------------                    ----------   -----------   ----------   --------
<S>                                    <C>          <C>           <C>          <C>
 
Ft. Worth
  West/Southwest.....................    $ 4.06        $10.59       $11.89      $12.66
                                         ------        ------       ------      ------
     West Region Total/Weighted
       Average.......................      8.49        $14.48       $16.07      $20.43
                                         ------        ------       ------      ------
     Total...........................     10.41        $18.91       $20.22      $23.73
                                         ======        ======       ======      ======
</TABLE>
 
- ---------------
(1) Annualized Rent is the monthly contractual rent under existing leases as of
    September 30, 1997 multiplied by 12. This amount reflects total rent before
    any rent abatements and includes expense reimbursements, which may be
    estimates as of such date. Total rent abatements for leases in effect as of
    September 30, 1997 for the 12 months ending September 30, 1998 are
    approximately $6.9 million.
 
(2) Annualized Net Effective Rent is calculated for leases in effect as of
    September 30, 1997 as follows: Annualized Rent, calculated as described
    above, was reduced to reflect the annualized costs of tenant improvements
    and leasing commissions, if any, paid or payable by EOP with respect to
    leases entered into subsequent to the later of 1991 or the date of
    acquisition of the relevant EOP Property (calculated by dividing the total
    tenant improvements and leasing commissions for a given lease by the term of
    that lease in months and multiplying the result by 12). Finally, the result
    of this calculation was reduced by the estimated operating expenses per
    square foot, based on 1996 actual operating expenses for EOP Properties
    owned as of January 1, 1996 and based on EOP's estimate of annual operating
    expenses for Properties acquired subsequent to January 1, 1996.
 
(3) Represents the gross rental rate per occupied square foot as of the later of
    January 1, 1993 or the date of acquisition, for EOP Properties acquired
    after January 1, 1993, calculated by annualizing the rent under existing
    leases as of that date. The weighted average for each region represents the
    weighted average gross rental rate per occupied square foot for each EOP
    Property multiplied by the rentable square feet for each EOP Property
    divided by the total rentable square feet per region.
 
(4) Represents the average asking gross rental rate per rentable square foot for
    selected buildings which EOP deems to be of comparable size, class, location
    and age based upon information obtained from CB Commercial Real Estate
    Group, Inc./Torto Wheaton Research, Baxter Southwest and Jamison Research,
    Inc., as of June 30, 1997.
 
                                       101
<PAGE>   110
 
     The following table sets forth certain information relating to each EOP
Office Property as of September 30, 1997.
<TABLE>
<CAPTION>
 
                                                                         PERCENTAGE
                                                                          OF TOTAL
                                                                           OFFICE                               PERCENTAGE
                                                                         PORTFOLIO                                  OF
                                   NUMBER                    RENTABLE     RENTABLE                 ANNUALIZED   PORTFOLIO    NUMBER
                                     OF       YEAR BUILT/     SQUARE       SQUARE     PERCENTAGE      RENT      ANNUALIZED     OF
PROPERTY                         PROPERTIES    RENOVATED       FEET         FEET       OCCUPIED    ($000S)(1)      RENT      LEASES
- --------                         ----------   -----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                              <C>          <C>           <C>          <C>          <C>          <C>          <C>          <C>
PACIFIC REGION
Los Angeles
  Downtown
    Two California Plaza(6)....       1             1992     1,329,809       4.0%        87.8%      $ 25,178        4.0%        31
  Pasadena
    Pasadena Towers............       2          1990-91       439,367       1.3         84.6         10,328        1.6         31
Orange County
  Central Orange
    500 Orange Tower(7)........       1             1988       290,765       0.9         91.7          4,892        0.8         47
    1100 Executive Tower.......       1             1987       366,747       1.1         99.4          6,341        1.0         26
  Irvine/Airport
    1920 Main Plaza............       1             1988       305,662       0.9         97.3          6,086        1.0         41
    2010 Main Plaza............       1             1988       280,882       0.8         91.1          5,714        0.9         33
San Diego
  La Jolla
    The Plaza at La Jolla
      Village(5)...............       5          1987-90       635,419       1.9         98.7         15,048        2.4         88
    Smith Barney Tower.........       1             1987       187,999       0.6         80.5          3,238        0.5         16
San Francisco
  Downtown
    201 Mission Street.........       1             1981       483,289       1.4         93.2          8,604        1.4         22
    580 California.............       1             1984       313,012       0.9        100.0          8,116        1.3         29
    60 Spear Street Building...       1          1967/87       133,782       0.4        100.0          3,233        0.5          9
    One Maritime Building......       1          1967/90       523,929       1.6         90.5         13,251        2.1         40
    One Market.................       1          1976/95     1,460,081       4.4         97.8         35,939        5.7        121
                                     --                     ----------     -----        -----       --------      -----      -----
        Pacific Region
          Total/Weighted
          Average..............      18                      6,750,743      20.2%        93.4%      $145,966       23.2%       534
SOUTHEAST REGION
Ft. Lauderdale
  Downtown
    First Union Center.........       1             1991       225,500       0.7%        99.0%      $  5,930        0.9%        21
Orlando
  Downtown
    SunTrust Center............       1             1988       640,385       1.9%        93.3%      $ 14,506        2.3%        45
 
<CAPTION>
                                              ANNUALIZED
                                               RENT PER
                                 ANNUALIZED    OCCUPIED
                                    NET         SQUARE
                                 EFFECTIVE       FOOT       ANNUALIZED
                                  RENT PER       AS OF       RENT PER     MARKET
                                  OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
                                   SQUARE     ACQUISITION     SQUARE      SQUARE
PROPERTY                          FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- --------                         ----------   -----------   ----------   --------
<S>                              <C>          <C>           <C>          <C>
PACIFIC REGION
Los Angeles
  Downtown
    Two California Plaza(6)....    $10.75        $22.08       $21.56      $25.86
  Pasadena
    Pasadena Towers............     17.70         27.79        27.78       25.22
Orange County
  Central Orange
    500 Orange Tower(7)........      8.81         22.61        18.35       19.90
    1100 Executive Tower.......      8.96         18.56        17.39       19.90
  Irvine/Airport
    1920 Main Plaza............     12.42         20.35        20.46       24.22
    2010 Main Plaza............     13.83         21.24        22.32       24.22
San Diego
  La Jolla
    The Plaza at La Jolla
      Village(5)...............     14.77         20.34        24.00       24.30
    Smith Barney Tower.........     12.92         19.40        21.40       24.30
San Francisco
  Downtown
    201 Mission Street.........      8.49         18.80        19.10       35.31
    580 California.............     12.92         23.02        25.93       34.82
    60 Spear Street Building...     11.37         23.12        24.17       33.41
    One Maritime Building......     17.33         29.81        27.95       35.31
    One Market.................     12.03         24.07        25.16       38.22
                                   ------        ------       ------      ------
        Pacific Region
          Total/Weighted
          Average..............     12.37        $22.79       $23.16      $29.55
SOUTHEAST REGION
Ft. Lauderdale
  Downtown
    First Union Center.........    $15.42        $17.45       $26.56      $24.57
Orlando
  Downtown
    SunTrust Center............    $14.82        $23.99       $24.29      $23.63
</TABLE>
 
                                       102
<PAGE>   111
<TABLE>
<CAPTION>
 
                                                                         PERCENTAGE
                                                                          OF TOTAL
                                                                           OFFICE                               PERCENTAGE
                                                                         PORTFOLIO                                  OF
                                   NUMBER                    RENTABLE     RENTABLE                 ANNUALIZED   PORTFOLIO    NUMBER
                                     OF       YEAR BUILT/     SQUARE       SQUARE     PERCENTAGE      RENT      ANNUALIZED     OF
PROPERTY                         PROPERTIES    RENOVATED       FEET         FEET       OCCUPIED    ($000S)(1)      RENT      LEASES
- --------                         ----------   -----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                              <C>          <C>           <C>          <C>          <C>          <C>          <C>          <C>
Palm Beach County, FL
  West Palm Beach
    One Clearlake Centre.......       1             1987       215,104       0.6         86.1          3,563        0.6         35
Sarasota
  Downtown
    Sarasota City Center.......       1             1989       247,891       0.7         95.0          4,238        0.7         35
Tampa
  Westshore
    Tampa Commons..............       1             1985       254,808       0.8        100.0          4,715        0.8         23
    Westshore Center...........       1             1984       215,523       0.6         98.3          3,398        0.5         36
Atlanta
  Midtown
    Promenade II...............       1             1990       770,840       2.3         95.8         16,394        2.6         25
  North Central
    Central Park...............       2             1986       612,733       1.8         96.8         11,834        1.9         74
  Northwest
    Paces West.................       2             1988       641,263       1.9         95.0         12,466        2.0         41
Charlotte
  Downtown
    Wachovia Center............       1          1972/94       581,666       1.7        100.0          6,897        1.1          9
Raleigh/Durham
  Durham
    University Tower...........       1          1987/92       181,221       0.5         98.6          3,260        0.5         35
Nashville
  Downtown
    Nations Bank Plaza.........       1          1977/95       421,513       1.3%        98.4%      $  5,590        0.9%        22
                                     --                     ----------     -----        -----       --------      -----      -----
        Southeast Region
          Total/Weighted
          Average..............      14                      5,008,447      15.0%        96.3%      $ 92,790       14.7%       401
NORTHEAST REGION
Fairfield County, CT
  Shelton
    Shelton Point..............       1          1985/93       159,848       0.5%        94.1%      $  2,199        0.3%        12
  Stamford
    One Stamford Plaza.........       1          1986/94       212,244       0.6        100.0          5,338        0.8         12
    Two Stamford Plaza.........       1          1986/94       253,020       0.8        100.0          6,923        1.1         21
    Three Stamford Plaza.......       1          1980/94       241,575       0.7%        97.3%      $  5,002        0.8%        17
 
<CAPTION>
                                              ANNUALIZED
                                               RENT PER
                                 ANNUALIZED    OCCUPIED
                                    NET         SQUARE
                                 EFFECTIVE       FOOT       ANNUALIZED
                                  RENT PER       AS OF       RENT PER     MARKET
                                  OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
                                   SQUARE     ACQUISITION     SQUARE      SQUARE
PROPERTY                          FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- --------                         ----------   -----------   ----------   --------
<S>                              <C>          <C>           <C>          <C>
Palm Beach County, FL
  West Palm Beach
    One Clearlake Centre.......      6.34         18.90        19.24       24.49
Sarasota
  Downtown
    Sarasota City Center.......      9.10         17.47        18.00       15.50
Tampa
  Westshore
    Tampa Commons..............     10.24         22.16        18.50       20.58
    Westshore Center...........      7.02         14.80        16.04       20.58
Atlanta
  Midtown
    Promenade II...............     13.84         21.98        22.19       21.77
  North Central
    Central Park...............     12.01         19.07        19.94       24.44
  Northwest
    Paces West.................     13.15         18.83        20.47       24.14
Charlotte
  Downtown
    Wachovia Center............      6.64         11.04        11.86       17.56
Raleigh/Durham
  Durham
    University Tower...........      9.86         13.37        18.25       19.62
Nashville
  Downtown
    Nations Bank Plaza.........    $ 6.03        $ 8.58       $13.47      $18.93
                                   ------        ------       ------      ------
        Southeast Region
          Total/Weighted
          Average..............     11.03        $17.91       $19.23      $21.65
NORTHEAST REGION
Fairfield County, CT
  Shelton
    Shelton Point..............    $ 5.95        $14.11       $14.62      $24.66
  Stamford
    One Stamford Plaza.........     12.84         26.47        25.15       27.56
    Two Stamford Plaza.........     14.82         32.27        27.36       27.56
    Three Stamford Plaza.......    $10.21        $18.66       $21.27      $27.56
</TABLE>
 
                                       103
<PAGE>   112
<TABLE>
<CAPTION>
 
                                                                         PERCENTAGE
                                                                          OF TOTAL
                                                                           OFFICE                               PERCENTAGE
                                                                         PORTFOLIO                                  OF
                                   NUMBER                    RENTABLE     RENTABLE                 ANNUALIZED   PORTFOLIO    NUMBER
                                     OF       YEAR BUILT/     SQUARE       SQUARE     PERCENTAGE      RENT      ANNUALIZED     OF
PROPERTY                         PROPERTIES    RENOVATED       FEET         FEET       OCCUPIED    ($000S)(1)      RENT      LEASES
- --------                         ----------   -----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                              <C>          <C>           <C>          <C>          <C>          <C>          <C>          <C>
    Four Stamford Plaza........       1          1979/94       260,581       0.8         95.9          5,008        0.8          9
    177 Broad Street...........       1             1989       187,573       0.6         93.5          4,152        0.7         15
    300 Atlantic Street........       1          1987/96       272,458       0.8        100.0          7,190        1.1         26
    Canterbury Green(6)........       1             1987       224,405       0.7        100.0          6,710        1.1         21
Washington, D.C.
  Downtown
    1111 19th Street...........       1          1979/83       252,014       0.8         98.8          7,256        1.2         30
    1620 L Street..............       1             1989       156,272       0.5         98.0          4,348        0.7         16
Boston
  Downtown
    28 State Street(8).........       1          1968/97       570,040       1.7         56.0       $ 10,687        1.7         11
New York
  Midtown
    850 Third Avenue...........       1          1960/96       562,567       1.7        100.0         16,718        2.7         28
Philadelphia
  Downtown
    1601 Market Street.........       1             1970       681,289       2.0         94.8         13,044        2.1         71
Norfolk
  Downtown
    Dominion Tower(5)..........       1             1987       403,276       1.2         95.4          6,354        1.0         53
Northern Virginia
  Reston
    Reston Town Center.........       3             1990       726,045       2.2         99.7         19,783        3.1         81
                                     --                     ----------     -----        -----       --------      -----      -----
        Northeast Region
          Total/Weighted
          Average..............      17                      5,163,207      15.5%        93.2%      $120,711       19.2%       423
CENTRAL REGION
Chicago
  Downtown
    161 N. Clark...............       1             1992     1,010,520       3.0%        73.1%      $ 16,138        2.6%        55
    30 N. LaSalle..............       1          1974/90       925,950       2.8         97.6         19,002        3.0        117
    One North Franklin.........       1             1991       617,592       1.8%        98.9%      $ 12,773        2.0%        54
 
<CAPTION>
                                              ANNUALIZED
                                               RENT PER
                                 ANNUALIZED    OCCUPIED
                                    NET         SQUARE
                                 EFFECTIVE       FOOT       ANNUALIZED
                                  RENT PER       AS OF       RENT PER     MARKET
                                  OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
                                   SQUARE     ACQUISITION     SQUARE      SQUARE
PROPERTY                          FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- --------                         ----------   -----------   ----------   --------
<S>                              <C>          <C>           <C>          <C>
    Four Stamford Plaza........      7.71         19.20        20.05       27.56
    177 Broad Street...........     13.44         21.65        23.68       27.56
    300 Atlantic Street........     14.30         22.17        26.39       27.56
    Canterbury Green(6)........     18.88         30.59        29.90       27.56
Washington, D.C.
  Downtown
    1111 19th Street...........     15.95         20.85        29.14       28.37
    1620 L Street..............     16.26         27.04        28.38       29.48
Boston
  Downtown
    28 State Street(8).........     16.40            --        33.48       36.46
New York
  Midtown
    850 Third Avenue...........     15.06         28.01        29.72       36.59
Philadelphia
  Downtown
    1601 Market Street.........     11.47         20.14        20.21       18.71
Norfolk
  Downtown
    Dominion Tower(5)..........      7.03         14.19        16.52       16.40
Northern Virginia
  Reston
    Reston Town Center.........     17.14         24.29        27.32       30.00
                                   ------        ------       ------      ------
        Northeast Region
          Total/Weighted
          Average..............    $13.48        $20.30       $25.09      $27.84
CENTRAL REGION
Chicago
  Downtown
    161 N. Clark...............    $ 4.40        $21.65       $21.84      $23.56
    30 N. LaSalle..............      7.28         20.95        21.02       25.47
    One North Franklin.........    $ 5.80        $31.26       $20.91      $23.98
</TABLE>
 
                                       104
<PAGE>   113
<TABLE>
<CAPTION>
 
                                                                         PERCENTAGE
                                                                          OF TOTAL
                                                                           OFFICE                               PERCENTAGE
                                                                         PORTFOLIO                                  OF
                                   NUMBER                    RENTABLE     RENTABLE                 ANNUALIZED   PORTFOLIO    NUMBER
                                     OF       YEAR BUILT/     SQUARE       SQUARE     PERCENTAGE      RENT      ANNUALIZED     OF
PROPERTY                         PROPERTIES    RENOVATED       FEET         FEET       OCCUPIED    ($000S)(1)      RENT      LEASES
- --------                         ----------   -----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                              <C>          <C>           <C>          <C>          <C>          <C>          <C>          <C>
  East-West Corridor
    Oakbrook Terrace Tower.....       1             1988       772,928       2.3         86.6         17,335        2.8         53
  O'Hare
    1700 Higgins...............       1             1986       133,876       0.4         99.1          2,173        0.3         15
Indianapolis
  Downtown
    Bank One Center/Tower......       2             1990     1,057,877       3.2         91.7         19,092        3.0         81
Cleveland
  Downtown
    BP Tower...................       1             1985     1,242,144       3.7         93.3         17,965        2.9         34
Columbus
  Downtown
    One Columbus Building......       1             1987       407,472       1.2         87.1          8,561        1.4         28
  Worthington
    Community Corporate
      Center...................       1             1987       250,169       0.7         92.0          4,618        0.7         40
    One Crosswoods Center......       1             1984       129,583       0.4         96.2          2,050        0.3         21
                                     --                     ----------     -----        -----       --------      -----      -----
        Central Region
          Total/Weighted
          Average..............      11                      6,548,111      19.6%        90.0%      $119,707       19.0%       498
SOUTHWEST REGION
New Orleans
  Downtown
    LL&E Tower.................       1             1987       545,157       1.6         82.7          7,656        1.2         31
    Texaco Center..............       1             1984       619,714       1.9         82.1          8,274        1.3         23
  Metairie
    One Lake Center............       1          1981/96       289,112       0.9         93.7          3,977        0.6         49
    Two Lakeway Center.........       1          1984/96       440,826       1.3         95.7          6,213        1.0         86
    Three Lakeway Center.......       1          1987/96       462,890       1.4         96.8          6,840        1.1         53
Austin
  Downtown
    Franklin Plaza.............       1             1987       517,849       1.6%        88.9%      $  9,190        1.5%        38
    One American Center(6).....       1             1984       505,770       1.5         97.0          9,217        1.5         42
    San Jacinto Center.........       1             1987       400,329       1.2         98.4          7,191        1.1         50
Houston
  Galleria
    San Felipe Plaza(5)........       1             1984       959,466       2.9         94.6         14,610      $ 2.3        129
 
<CAPTION>
                                              ANNUALIZED
                                               RENT PER
                                 ANNUALIZED    OCCUPIED
                                    NET         SQUARE
                                 EFFECTIVE       FOOT       ANNUALIZED
                                  RENT PER       AS OF       RENT PER     MARKET
                                  OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
                                   SQUARE     ACQUISITION     SQUARE      SQUARE
PROPERTY                          FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- --------                         ----------   -----------   ----------   --------
<S>                              <C>          <C>           <C>          <C>
  East-West Corridor
    Oakbrook Terrace Tower.....     17.15         26.21        25.90       27.21
  O'Hare
    1700 Higgins...............      6.05         21.52        16.38       19.27
Indianapolis
  Downtown
    Bank One Center/Tower......      9.29         15.94        19.69       21.43
Cleveland
  Downtown
    BP Tower...................      7.64         13.18        15.50       21.60
Columbus
  Downtown
    One Columbus Building......     15.22         22.96        24.11       24.12
  Worthington
    Community Corporate
      Center...................      9.89         19.65        20.06       20.97
    One Crosswoods Center......      8.20         13.29        16.45       19.56
                                   ------        ------       ------      ------
        Central Region
          Total/Weighted
          Average..............    $ 8.86        $20.30       $20.31      $23.35
SOUTHWEST REGION
New Orleans
  Downtown
    LL&E Tower.................     10.48         16.98        16.98       16.31
    Texaco Center..............     10.08         16.26        16.26       14.76
  Metairie
    One Lake Center............      7.40         13.74        14.68       18.06
    Two Lakeway Center.........      8.05         13.11        14.72       18.06
    Three Lakeway Center.......      6.76         13.07        15.27       18.06
Austin
  Downtown
    Franklin Plaza.............    $10.27        $18.43       $19.96      $21.36
    One American Center(6).....      8.86         18.05        18.79       21.36
    San Jacinto Center.........      6.45         16.81        18.25       21.36
Houston
  Galleria
    San Felipe Plaza(5)........      7.24         17.24        16.10       16.82
</TABLE>
 
                                       105
<PAGE>   114
<TABLE>
<CAPTION>
 
                                                                         PERCENTAGE
                                                                          OF TOTAL
                                                                           OFFICE                               PERCENTAGE
                                                                         PORTFOLIO                                  OF
                                   NUMBER                    RENTABLE     RENTABLE                 ANNUALIZED   PORTFOLIO    NUMBER
                                     OF       YEAR BUILT/     SQUARE       SQUARE     PERCENTAGE      RENT      ANNUALIZED     OF
PROPERTY                         PROPERTIES    RENOVATED       FEET         FEET       OCCUPIED    ($000S)(1)      RENT      LEASES
- --------                         ----------   -----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                              <C>          <C>           <C>          <C>          <C>          <C>          <C>          <C>
  North/Airport
    Intercontinental Center....       1          1983/91       194,801       0.6        100.0          2,715        0.4         13
  Northborough Tower(5)........       1          1983/90       207,908       0.6         95.1          2,725        0.4         14
San Antonio
  Airport
    Union Square...............       1             1986       194,398       0.6         97.8          2,548        0.4         21
  Northwest
    Colonnade I................       1             1983       168,637       0.5         92.0          2,273        0.4         27
    Northwest Center...........       1          1984/94       241,248       0.7         92.9          2,798        0.4         36
                                     --                     ----------     -----        -----       --------      -----      -----
        Southwest Region Total/
          Weighted Average.....      14                      5,748,105      17.2%        92.5%      $ 86,227       13.7%       612
WEST REGION
Phoenix
  Central Corridor
    49 East Thomas Road(9).....       1          1974/93        18,892       0.1         49.1             70        0.0          9
    One Phoenix Plaza(10)......       1             1989       586,403       1.8        100.0          7,338        1.2          1
Denver
  Southeast/Denver Tech Center
    Denver Corporate Center II
      & III....................       2       1981/93-97       358,357       1.1        100.0          6,304        1.0         27
    The Quadrant...............       1             1985       313,302       0.9         93.5          5,413        0.9         39
St. Louis
  Clayton
    Interco Corporate Tower....       1             1986       339,163       1.0         98.5          7,457        1.2         34
Albuquerque
  Downtown
    500 Marquette Building.....       1             1985       230,022       0.7%        94.7%      $  3,330        0.5%        32
Oklahoma City
  Northwest
    Atrium Towers..............       2          1980/95       155,865       0.5         96.7          1,314        0.2         47
    5100 Brookline.............       1             1974       105,459       0.3         94.1            980        0.2         63
 
<CAPTION>
                                              ANNUALIZED
                                               RENT PER
                                 ANNUALIZED    OCCUPIED
                                    NET         SQUARE
                                 EFFECTIVE       FOOT       ANNUALIZED
                                  RENT PER       AS OF       RENT PER     MARKET
                                  OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
                                   SQUARE     ACQUISITION     SQUARE      SQUARE
PROPERTY                          FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- --------                         ----------   -----------   ----------   --------
<S>                              <C>          <C>           <C>          <C>
  North/Airport
    Intercontinental Center....      5.44         13.35        13.94       19.06
  Northborough Tower(5)........      5.32         12.40        13.78       13.67
San Antonio
  Airport
    Union Square...............      5.36         11.55        13.40       16.27
  Northwest
    Colonnade I................      7.87         13.76        14.65       16.27
    Northwest Center...........      4.91         12.27        12.48       16.27
                                   ------        ------       ------      ------
        Southwest Region Total/
          Weighted Average.....    $ 7.89        $15.62       $16.22      $17.84
WEST REGION
Phoenix
  Central Corridor
    49 East Thomas Road(9).....      0.35          7.52         7.52       15.00
    One Phoenix Plaza(10)......      9.48         12.38        12.51       20.32
Denver
  Southeast/Denver Tech Center
    Denver Corporate Center II
      & III....................      9.57         15.24        17.59       22.66
    The Quadrant...............      8.17         15.60        18.47       22.66
St. Louis
  Clayton
    Interco Corporate Tower....     12.95         19.81        22.33       23.57
Albuquerque
  Downtown
    500 Marquette Building.....    $ 5.73        $16.47       $15.29      $17.09
Oklahoma City
  Northwest
    Atrium Towers..............      2.60          8.03         8.71       11.89
    5100 Brookline.............      3.53          8.96         9.87       13.40
</TABLE>
 
                                       106
<PAGE>   115
<TABLE>
<CAPTION>
 
                                                                         PERCENTAGE
                                                                          OF TOTAL
                                                                           OFFICE                               PERCENTAGE
                                                                         PORTFOLIO                                  OF
                                   NUMBER                    RENTABLE     RENTABLE                 ANNUALIZED   PORTFOLIO    NUMBER
                                     OF       YEAR BUILT/     SQUARE       SQUARE     PERCENTAGE      RENT      ANNUALIZED     OF
PROPERTY                         PROPERTIES    RENOVATED       FEET         FEET       OCCUPIED    ($000S)(1)      RENT      LEASES
- --------                         ----------   -----------   ----------   ----------   ----------   ----------   ----------   ------
<S>                              <C>          <C>           <C>          <C>          <C>          <C>          <C>          <C>
Dallas
  LBJ Corridor
    Four Forest(5).............       1             1985       394,324       1.2         97.6          5,876        0.9         58
    North Central Plaza
      Three....................       1          1986/94       346,575       1.0         92.2          5,266        0.8         39
  North Central
    9400 NCX...................       1          1981/95       379,556       1.1         92.7          4,771        0.8         75
  Preston Center
    Preston Commons............       3             1986       418,604       1.3         92.7          8,216        1.3         71
    Sterling Plaza.............       1          1984/94       302,747       0.9         92.0          5,237        0.8         73
Ft. Worth
  West/Southwest
    Summitt Office Park........       2          1974/93       239,095       0.7%        94.8%      $  2,694        0.4%        63
                                     --                     ----------     -----        -----       --------      -----      -----
        West Region
          Total/Weighted
          Average..............      19                      4,188,364      12.5%        95.5%      $ 64,264       10.2%       631
                                     --                     ----------     -----        -----       --------      -----      -----
        Total/Weighted
          Average..............      93                     33,406,977     100.0%        93.2%      $629,667      100.0%     3,099
                                                            ==========     =====        =====       ========      =====      =====
 
<CAPTION>
                                              ANNUALIZED
                                               RENT PER
                                 ANNUALIZED    OCCUPIED
                                    NET         SQUARE
                                 EFFECTIVE       FOOT       ANNUALIZED
                                  RENT PER       AS OF       RENT PER     MARKET
                                  OCCUPIED     1/1/93 OR     OCCUPIED    RENT PER
                                   SQUARE     ACQUISITION     SQUARE      SQUARE
PROPERTY                          FOOT(2)       DATE(3)      FOOT(1)     FOOT(4)
- --------                         ----------   -----------   ----------   --------
<S>                              <C>          <C>           <C>          <C>
Dallas
  LBJ Corridor
    Four Forest(5).............      6.74         15.78        15.26       21.51
    North Central Plaza
      Three....................      7.33         13.51        16.47       21.51
  North Central
    9400 NCX...................      4.77         11.74        13.56       19.68
  Preston Center
    Preston Commons............     15.28         19.42        21.18       22.89
    Sterling Plaza.............      9.98         13.72        18.81       22.89
Ft. Worth
  West/Southwest
    Summitt Office Park........    $ 4.06        $10.59       $11.89      $12.66
                                   ------        ------       ------      ------
        West Region
          Total/Weighted
          Average..............     $8.49        $14.48       $16.07      $20.43
                                   ------        ------       ------      ------
        Total/Weighted
          Average..............    $10.41        $18.91       $20.22      $23.73
                                   ======        ======       ======      ======
</TABLE>
 
- ---------------
 (1) Annualized Rent is the monthly contractual rent under existing leases as of
     September 30, 1997, multiplied by 12. This amount reflects total base rent
     before any rent abatements, but includes expense reimbursements, which may
     be estimates as of such date. Total rent abatements for leases in effect as
     of September 30, 1997, for the 12 months ending September 30, 1998 are
     approximately $6.9 million.
 
 (2) Annualized Net Effective Rent is calculated for leases in effect as of
     September 30, 1997 as follows: Annualized Rent, calculated as described
     above, was reduced to reflect the annualized costs of tenant improvements
     and leasing commissions, if any, paid or payable by EOP with respect to
     leases entered into subsequent to the later of 1991 or the date of
     acquisition of the relevant EOP Property (calculated by dividing the total
     tenant improvements and leasing commissions for a given lease by the term
     of that lease in months and multiplying the result by 12). Finally, the
     result of
 
                                       107
<PAGE>   116
 
this calculation was reduced by the estimated operating expenses per square
foot, based on 1996 actual operating expenses for EOP Properties owned as of
January 1, 1996 and based on EOP's estimate of annual operating expenses for EOP
Properties acquired subsequent to January 1, 1996.
 
 (3) Represents the gross rental rate per occupied square foot as of the later
     of January 1, 1993, or the date of acquisition (for EOP Properties acquired
     after January 1, 1993) calculated by annualizing the base rent and expense
     reimbursements under existing leases as of that date. The weighted average
     for each region represents the weighted average gross rental rate per
     occupied square foot for each EOP Property multiplied by the rentable
     square feet for each EOP Property divided by the total rentable square feet
     per region.
 
 (4) Represents the average asking gross rental rate per rentable square foot
     for selected buildings which EOP deems to be of comparable size, class,
     location and age based upon information obtained from CB Commercial Real
     Estate Group, Inc./Torto Wheaton Research, Baxter Southwest and Jamison
     Research, Inc., as of June 30, 1997.
 
 (5) This EOP Office Property is held in a partnership with an unaffiliated
     third party and in the case of San Felipe Plaza, an affiliated party.
 
 (6) This EOP Office Property is held subject to a ground lease. See Note 8 to
     the Combined Financial Statements of EOP Predecessors included herein.
 
 (7) This EOP Office Property is held subject to an interest in the improvements
     at the EOP Property held by an unaffiliated third party. In addition, EOP
     has a mortgage interest in such improvements. See Note 5 to the Combined
     Financial Statements of EOP Predecessors included herein.
 
                                       108
<PAGE>   117
 
 (8) This EOP Office Property recently underwent major redevelopment and tenants
     commenced occupancy in May 1997.
 
 (9) This EOP Office Property was purchased in conjunction with the purchase of
     One Phoenix Plaza.
 
(10) This EOP Office Property is 100% leased to a single tenant on a triple net
     basis, whereby the tenant pays for certain operating expenses directly
     rather than reimbursing EOP. The amounts shown above for annualized rent
     include the amounts for reimbursement of expenses paid by EOP but do not
     make any adjustments for expenses paid directly by the tenant.
 
                                       109
<PAGE>   118
 
EOP PARKING FACILITIES
 
     Information concerning the EOP Parking Facilities as of September 30, 1997
is set forth below.
 
<TABLE>
<CAPTION>
                                                                                           NUMBER
                                          APPROXIMATE                    MANAGEMENT          OF
                                           NUMBER OF                      COMPANY         PARKING
PROPERTY NAME                               SPACES         CITY         OR LESSEE(1)     FACILITIES
- -------------                             -----------      ----         ------------     ----------
<S>                                       <C>           <C>           <C>                <C>
Boston Harbor Garage....................     1,380      Boston        Standard Parking        1
1602-34 Chancellor Garage...............       416      Philadelphia  Central Parking         1
15th & Sansom St. Garage................       313      Philadelphia  Central Parking         1
Juniper/Locust St. Garage...............       541      Philadelphia  Central Parking         1
1111 Sansom St. Garage..................       250      Philadelphia  Central Parking         1
1616 Sansom St. Garage..................       240      Philadelphia  Central Parking         1
Milwaukee Center(2).....................       876      Milwaukee     Standard Parking        1
Capitol Commons Garage(2)(3)............       950      Indianapolis  Central Parking         1
North Loop Transportation Center(3).....     1,172      Chicago       Standard Parking        1
Theater District Garage(3)..............     1,006      Chicago       Standard Parking        1
601 Tchoupitoulas.......................       759      New Orleans   Central Parking         1
Civic Parking(4)........................     7,464      St. Louis     Central Parking         4
Adams-Wabash Garage.....................       670      Chicago       Standard Parking        1
                                            ------                                           --
          Total.........................    16,037                                           16
                                            ======                                           ==
</TABLE>
 
- ---------------
(1) With the exception of Capitol Commons Garage, all of the named Parking
    Facilities are operated by the designated third-party Service Company under
    a lease agreement whereby EOP and the Service Company share the gross
    receipts from the parking operation or EOP receives a fixed payment from the
    Service Company, and EOP bears none of the operational expenses. In the case
    of the Capitol Commons Garage, the operating agreement provides for EOP's
    receipt of a percentage of net receipts and, therefore, results in an
    insignificant amount of non-qualifying gross income for REIT qualification
    purposes relative to the total gross income of EOP.
 
(2) This EOP Parking Facility is held subject to a ground lease. See Note 8 to
    the Combined Financial Statements of EOP Predecessors included herein.
 
(3) Each of these EOP Parking Facilities is held in a partnership with an
    unaffiliated third party. EOP Partnership or a Subsidiary is the managing
    general partner of each such partnership. See Note 6 to the Combined
    Financial Statements of EOP Predecessors included herein.
 
(4) EOP has a 50% membership interest in a portfolio of four EOP Parking
    Facilities serving the St. Louis, Missouri area.
 
TENANTS
 
     The EOP Office Properties are leased to 3,099 tenants. No tenant accounts
for more than 2.3% of EOP's aggregate annualized rent or 1.7% of aggregate
occupied square feet.
 
                                       110
<PAGE>   119
 
LEASE EXPIRATION BY REGION
 
     The following table sets forth a schedule of lease expirations by region
for leases in place as of September 30, 1997, for each of the 12 full and
partial calendar years beginning October 1, 1997, for the EOP Office Properties,
on an aggregate basis, assuming that none of the tenants exercise renewal
options and excluding an aggregate of 2,262,142 square feet of unleased space.
<TABLE>
<CAPTION>
 
                                                          1997          1998          1999          2000          2001
                                                       -----------   -----------   -----------   -----------   -----------
<S>               <C>                                  <C>           <C>           <C>           <C>           <C>
Pacific Region    Square Feet(1).....................      163,454       410,242     1,012,756       614,729     1,038,366
Totals            % Square Feet(2)...................          2.4%          6.1%         15.0%          9.1%         15.4%
                  Annualized Rent....................    2,830,276    10,364,304    23,159,692    14,158,676    22,225,253
                  Number of Leases...................           37            88           100            71            83
                  Rent Per Square Foot...............  $     17.32   $     25.26   $     22.87   $     23.03   $     21.40
                  Expected Rent(4)...................  $     29.55
                  Replacement Cost Rent(5)...........  $     43.63
Southeast Region  Square Feet(1).....................       81,398       349,218       434,158       895,749       495,994
Totals            % Square Feet(2)...................          1.6%          7.0%          8.7%         17.9%          9.9%
                  Annualized Rent(3).................    1,562,529     6,849,739     7,854,070    18,303,232    10,763,989
                  Number of Leases...................           28            70            72            78            59
                  Rent Per Square Foot...............  $     19.20   $     19.61   $     18.09   $     20.43   $     21.70
                  Expected Rent(4)...................  $     21.65
                  Replacement Cost Rent(5)...........  $     31.01
Northeast Region  Square Feet(1).....................       65,439       367,188       433,391       567,219       677,829
Totals            % Square Feet(2)...................          1.3%          7.1%          8.4%         11.0%         13.1%
                  Annualized Rent(3).................      843,416     9,092,769    11,564,100    15,167,510    17,027,616
                  Number of Leases...................           21            42            54            57            55
                  Rent Per Square Foot...............  $     12.89   $     24.76   $     26.68   $     26.74   $     25.12
                  Expected Rent(4)...................  $     27.84
                  Replacement Cost Rent(5)...........  $     40.95
Central Region    Square Feet(1).....................      105,948       441,681       333,599       480,585       409,455
Totals            % Square Feet(2)...................          1.6%          6.7%          5.1%          7.3%          6.3%
                  Annualized Rent(3).................    2,104,998    11,219,696     7,576,209    11,208,567     8,891,259
                  Number of Leases...................           45            60            58            56            68
                  Rent Per Square Foot...............  $     19.87   $     25.40   $     22.71   $     23.32   $     21.71
                  Expected Rent(4)...................  $     23.35
                  Replacement Cost Rent(5)...........  $     38.73
Southwest Region  Square Feet(1).....................      237,536       623,142       528,758     1,092,625       749,431
Totals            % Square Feet(2)...................          4.1%         10.8%          9.2%         19.0%         13.0%
                  Annualized Rent(3).................    3,224,090     9,685,662     8,228,466    19,562,992    11,917,932
                  Number of Leases...................           94           114            95           112            84
                  Rent Per Square Foot...............  $     13.57   $     15.54   $     15.56   $     17.90   $     15.90
                  Expected Rent(4)...................  $     17.84
                  Replacement Cost Rent(5)...........  $     28.83
West Region       Square Feet(1).....................      230,053       489,536       674,306       608,262       454,143
Totals            % Square Feet(2)...................          5.5%         11.7%         16.1%         14.5%         10.8%
                  Annualized Rent(3).................    3,156,217     8,867,196    11,016,914    10,009,607     7,890,171
                  Number of Leases...................          106           125           127           107            73
                  Rent Per Square Foot...............  $     13.72   $     18.11   $     16.34   $     16.46   $     17.37
                  Expected Rent(4)...................  $     20.43
                  Replacement Cost Rent(5)...........  $     27.50
Portfolio         Square Feet(1).....................      883,828     2,681,007     3,416,968     4,259,169     3,825,218
Totals            % Square Feet(2)...................          2.6%          8.0%         10.2%         12.8%         11.5%
                  Annualized Rent(3).................   13,721,525    56,079,366    69,399,452    88,410,585    78,716,220
                  Number of Leases...................          331           499           506           481           422
                  Rent Per Square Foot...............  $     15.53   $     20.92   $     20.31   $     20.76   $     20.58
                  Expected Rent(4)...................  $     23.73
                  Replacement Cost Rent(5)...........  $     35.80
 
<CAPTION>
                                                                                          2007
                                                                                           AND
                     2002          2003          2004          2005          2006        BEYOND         TOTALS
                  -----------   -----------   -----------   -----------   ----------   -----------   ------------
<S>               <C>           <C>           <C>           <C>           <C>          <C>           <C>
Pacific Region        569,617       398,266       249,607       320,984      273,056     1,250,943      6,302,020
Totals                    8.4%          5.9%          3.7%          4.8%         4.0%         18.5%          93.4%
                   14,090,402     9,964,616     6,003,342     7,520,554    6,934,824    28,714,063    145,966,001
                           53            26            17            16           17            26            534
                  $     24.74   $     25.02   $     24.05   $     23.43   $    25.40   $     22.95   $      23.16
Southeast Region      407,413       205,078       272,311       401,563      222,946     1,058,332      4,824,160
Totals                    8.1%          4.1%          5.4%          8.0%         4.5%         21.1%          96.3%
                    7,520,298     4,771,972     3,614,649     5,386,079    5,672,748    20,490,954     92,790,259
                           53             8             9             5            9            10            401
                  $     18.46   $     23.27   $     13.27   $     13.41   $    25.44   $     19.36   $      19.23
Northeast Region      642,353       400,272       499,283       319,461      295,880       542,933      4,811,248
Totals                   12.4%          7.8%          9.7%          6.2%         5.7%         10.5%          93.2%
                   15,591,794     9,260,838    12,168,971     8,051,550    6,647,797    15,294,941    120,711,302
                           55            44            27            22           23            23            423
                  $     24.27   $     23.14   $     24.37   $     25.20   $    22.47   $     28.17   $      25.09
Central Region        436,274       232,504       405,082       785,200      320,981     1,942,754      5,894,063
Totals                    6.7%          3.6%          6.2%         12.0%         4.9%         29.7%          90.0%
                    9,635,238     4,399,425     8,576,833    15,446,334    5,383,852    35,264,788    119,707,199
                           59            29            48            29           12            34            498
                  $     22.09   $     18.92   $     21.17   $     19.67   $    16.77   $     18.15   $      20.31
Southwest Region      691,843       260,675       457,905        72,924      446,126       154,048      5,315,013
Totals                   12.0%          4.5%          8.0%          1.3%         7.8%          2.7%          92.5%
                   11,683,950     4,110,261     8,819,155     1,311,485    7,070,911       612,591     86,227,493
                           71            15            14             4            7             2            612
                  $     16.89   $     15.77   $     19.26   $     17.98   $    15.85   $      3.98   $      16.22
West Region           527,474       160,643       705,001        54,008        5,429        89,476      3,998,331
Totals                   12.6%          3.8%         16.8%          1.3%         0.1%          2.1%          95.5%
                    9,068,903     2,751,421     9,385,730     1,146,707       94,331       877,234     64,264,432
                           53            23             9             4            2             2            631
                  $     17.19   $     17.13   $     13.31   $     21.23   $    17.38   $      9.80   $      16.07
Portfolio           3,274,974     1,657,438     2,589,189     1,954,140    1,564,418     5,038,486     31,144,835
Totals                    9.8%          5.0%          7.8%          5.9%         4.7%         15.1%          93.2%
                   67,590,584    35,258,531    48,568,680    38,862,710   31,804,463   101,254,571    629,666,686
                          344           145           124            80           70            97          3,099
                  $     20.64   $     21.27   $     18.76   $     19.89   $    20.33   $     20.10   $      20.22
</TABLE>
 
                                       111
<PAGE>   120
 
- ---------------
(1) Total net rentable square feet represented by expiring leases.
 
(2) Percentage of total net rentable feet represented by expiring leases.
 
(3) Annualized Rent is the monthly contractual rent under existing leases as of
    September 30, 1997, multiplied by 12. This amount reflects total base rent
    before any rent abatements and includes expense reimbursements which may be
    estimates as of such date. Total rent abatements for leases in effect as of
    September 30, 1997 for the 12 months ending September 30, 1998 are
    approximately $6.9 million.
 
(4) Represents the average asking gross rent per rentable square feet for
    buildings of comparable size, class, location and age, based upon
    information obtained from CB Commercial Real Estate Group, Inc./Torto
    Wheaton Research, Baxter Southwest or Jamison Research, Inc.
 
(5) Represents EOP's estimate of the gross rent that would be required to
    justify construction of a building which would be competitive with the
    respective Office Properties. An estimate of the replacement cost to build a
    property similar to the subject Property was calculated utilizing the
    Marshall and Swift (February 1997) Commercial Estimator 5.03c Software
    Program. The replacement cost rent is calculated under the assumptions that
    a net effective return of 12% would be required to justify new construction
    and that occupancy would stabilize at 95% as follows:
 
       Replacement Cost Rent = (estimated replacement cost per square foot X
       12%) + the estimated operating expenses per square foot at the subject
       property) 95%. The estimated replacement costs and the estimated
       replacement cost rents are based on building a building similar to the
       subject Property in terms of the quality of construction and amenities.
       The actual cost to construct a building that would be competitive with
       the subject Property and the required investor returns could be more or
       less than these estimates.
 
                                       112
<PAGE>   121
 
LEASE EXPIRATIONS -- TOTAL PORTFOLIO
 
     The following table sets forth a summary schedule of the lease expirations
for the EOP Office Properties for leases in place as of September 30, 1997,
assuming that none of the tenants exercise renewal options or termination
rights, if any, at or prior to the scheduled expirations:
 
<TABLE>
<CAPTION>
                                                                                              ANNUALIZED
                                                                                               RENT OF
                                                                   PERCENTAGE    ANNUALIZED    EXPIRING
                                                        SQUARE      OF TOTAL      RENT OF       LEASES      PERCENTAGE OF
                                          NUMBER OF   FOOTAGE OF    OCCUPIED      EXPIRING       PER       ANNUALIZED RENT
                                           LEASES      EXPIRING      SQUARE        LEASES       SQUARE       OF EXPIRING
YEAR OF LEASE EXPIRATION                  EXPIRING      LEASES        FEET        ($000S)        FOOT         LEASES(1)
- ------------------------                  ---------   ----------   ----------    ----------   ----------   ---------------
<S>                                       <C>         <C>          <C>           <C>          <C>          <C>
1997(2).................................      331       883,828        2.9%       $ 13,722      $15.53            2.2%
1998....................................      499     2,681,007        8.7          56,079       20.92            8.9
1999....................................      506     3,416,968       11.1          69,399       20.31           11.0
2000....................................      481     4,259,169       13.9          88,411       20.76           14.1
2001....................................      422     3,825,218       12.5          78,716       20.58           12.5
2002....................................      344     3,274,974       10.7          67,591       20.64           10.7
2003....................................      145     1,657,438        5.4          35,259       21.27            5.6
2004....................................      124     2,589,189        8.4          48,569       18.76            7.7
2005....................................       80     1,954,140        6.4          38,863       19.89            6.2
2006....................................       70     1,564,418        5.1          31,804       20.33            5.1
2007....................................       36     1,126,892        3.7          30,782       27.32            4.9
2008....................................       26     1,037,999        3.4          22,860       22.02            3.6
2009....................................       13       373,185        1.2           8,336       22.34            1.3
2010 and beyond.........................       22     2,008,795        6.6          39,276       19.55            6.2
                                            -----     ----------     -----        --------      ------          -----
  Total/Weighted Average................    3,099     30,653,220(3)  100.0%(3)    $605,129      $20.22          100.0%
                                            =====     ==========     =====        ========      ======          =====
</TABLE>
 
- ---------------
(1) Based on currently payable rent.
 
(2) Represents lease expirations from October 1, 1997 to December 31, 1997 and
    month-to-month leases.
 
(3) Reconciliation of total net rentable square footage is as follows:
 
<TABLE>
<CAPTION>
                                                         SQUARE FOOTAGE   PERCENTAGE OF TOTAL
                                                         --------------   -------------------
<S>                                                      <C>              <C>
Square footage occupied by tenants.....................    30,653,220             91.9%
Square footage used for management offices and building
  use, and remeasurement adjustments...................       491,615              1.3
Square footage vacant..................................     2,262,142              6.8
                                                           ----------           ------
     Total net rentable square footage.................    33,406,977            100.0%
                                                           ==========           ======
</TABLE>
 
                                       113
<PAGE>   122
 
LEASE DISTRIBUTIONS
 
     The following table sets forth information relating to the distribution of
the EOP Office Property leases, based on rentable square feet under lease, as of
September 30, 1997:
 
<TABLE>
<CAPTION>
                                                                         PERCENTAGE                                 PERCENTAGE
                                                             TOTAL      OF AGGREGATE                  ANNUALIZED   OF AGGREGATE
                                                 PERCENT    OCCUPIED     PORTFOLIO                       RENT       PORTFOLIO
SQUARE FEET                           NUMBER     OF ALL      SQUARE       OCCUPIED      ANNUALIZED    PER SQUARE    ANNUALIZED
UNDER LEASE                          OF LEASES   LEASES       FEET      SQUARE FEET        RENT          FOOT          RENT
- -----------                          ---------   -------   ----------   ------------   ------------   ----------   ------------
<S>                                  <C>         <C>       <C>          <C>            <C>            <C>          <C>
2,500 or Less......................    1,059       34.1%    1,399,539        4.6%      $ 25,261,934     $18.05          4.0%
2,501-5,000........................      666       21.5     2,292,036        7.5         44,219,820      19.29          7.0
5,001-7,500........................      365       11.8     2,110,283        6.9         41,406,322      19.62          6.6
7,501-10,000.......................      201        6.5     1,614,337        5.3         32,562,600      20.17          5.2
10,001-20,000......................      386       12.5     5,139,843       16.8        105,871,257      20.60         16.8
20,001-40,000......................      213        6.9     5,282,043       17.1        109,690,484      20.77         17.4
40,001-60,000......................       87        2.8     3,185,911       10.4         70,788,062      22.22         11.2
60,001-100,000.....................       53        1.7     3,046,127        9.9         72,022,315      23.64         11.4
100,001 or Greater.................       69        2.2     6,583,101       21.5        127,843,892      19.42         20.3
                                       -----      -----    ----------      -----       ------------     ------        -----
    Total/Weighted Average.........    3,099      100.0%   30,653,220      100.0%      $629,666,686     $20.54        100.0%
                                       =====      =====    ==========      =====       ============     ======        =====
</TABLE>
 
CAPITAL IMPROVEMENTS
 
     EOP has a history of acquiring and repositioning undercapitalized and
poorly managed properties, many of which have required significant capital
improvements due to deferred maintenance and/or required substantial renovation
to enable them to compete effectively. A number of the EOP Properties also have
had significant amounts of shell space requiring build out at the time of
acquisition. EOP takes these capital improvements and revenue enhancing tenant
improvements into consideration at the time of acquisition in determining the
amount of equity and debt financing required to purchase the Property and fund
the improvements. Therefore, capital improvements up to the first five years
after acquisition of these Properties are treated separately from typical
recurring capital expenditures and non-revenue enhancing tenant improvements and
leasing commissions required once these Properties have reached stabilized
occupancy and deferred maintenance and renovations planned at the time of
acquisition have been completed. Capital improvements (including tenant
improvements and leasing commissions for shell space) for the years ended
December 31, 1994, 1995 and 1996 and the nine months ended September 30, 1997
were $49.7 million, $48.8 million, $100.3 million and $57.0 million,
respectively, or $2.76, $2.16, $3.49 and $1.71 per square foot, respectively.
These amounts include $16.8 million, $47.3 million and $27.8 million for the
years ended December 31, 1995 and 1996 and the seven months ended September 30,
1997, respectively, for the redevelopment of the 28 State Street Building.
 
     EOP considers capital expenditures to be recurring expenditures relating to
the daily maintenance of the EOP Office Properties. The table below summarizes
capital expenditures for the years ended December 31, 1994, 1995 and 1996 and
the nine months ended September 30, 1997. The capital expenditures set forth
below are not necessarily indicative of future capital expenditures.
 
<TABLE>
<CAPTION>
                                                                                          1997
                                                                                        (THROUGH
                                                            1994     1995     1996    SEPTEMBER 30)
                                                           ------   ------   ------   -------------
<S>                                                        <C>      <C>      <C>      <C>
Number of EOP Office Properties..........................   61       71       81          93
Rentable Square Feet (in millions).......................   18.0     22.6     28.7        33.4
Annual Capital Expenditures per Square Foot..............  $  .32   $  .14   $  .16      $ 0.7
</TABLE>
 
TENANT IMPROVEMENT AND LEASING COMMISSION COSTS
 
     EOP distinguishes its tenant improvements and leasing commissions between
those that are revenue enhancing (which are required for space which is vacant
at the time of acquisition or that has been vacant for nine months or more) and
non-revenue enhancing (which are required to maintain the revenue being
 
                                       114
<PAGE>   123
 
generated from currently leased space). The table below summarizes the revenue
enhancing and non-revenue enhancing tenant improvements and leasing commissions
for the years ended December 31, 1994, 1995 and 1996 and the seven months ended
July 31, 1997. The tenant improvement and leasing commission costs set forth
below are presented on an aggregate basis and do not reflect significant
regional variations and, in any event, are not necessarily indicative of future
tenant improvement and leasing commission costs:
 
<TABLE>
<CAPTION>
                                                                                 1997               TOTAL/
                                                                               (THROUGH            WEIGHTED
                                     1994          1995          1996          JULY 31)            AVERAGE
                                  -----------   -----------   -----------     -----------        ------------
<S>                               <C>           <C>           <C>             <C>                <C>
Number of Office Properties.....           61            71            81              93
Rentable square feet (in
  millions).....................         18.0          22.6          28.7            33.4
Revenue enhancing tenant
  improvements and leasing
  commissions
  Annual (in thousands).........  $16,975,000   $20,981,000   $31,534,000     $ 6,930,000        $ 76,420,000
  Per square foot improved......  $     14.14   $     22.89   $     30.26(1)  $     15.90(2)     $      21.25
  Per square foot total.........  $       .94   $       .93   $      1.10(1)  $       .28(2)(3)  $        .74
  Renewal space
    Annual (in thousands).......  $11,095,000   $10,008,000   $15,486,000     $ 7,553,000        $ 44,142,000
    Per square foot improved....  $      5.41   $      7.82   $      6.79(1)  $      6.02(2)     $       6.43
    Per square foot total.......  $       .62   $       .44   $       .54(1)  $       .31(2)(3)  $        .43
  Retenanted space
    Annual (in thousands).......  $ 8,966,000   $ 8,446,000   $31,987,000     $10,689,000        $ 60,088,000
    Per square foot improved....  $     15.08   $     19.80   $     20.64(1)  $     13.93(2)     $      18.00
    Per square foot total.......  $       .50   $       .37   $      1.11(1)  $       .43(2)(3)  $        .58
Total non-revenue enhancing.....  $20,061,000   $18,454,000   $47,473,000     $18,242,000        $104,230,000
Per square foot improved........  $      7.58   $     10.81   $     12.39     $      9.02        $      10.21
Per square foot total...........  $      1.12   $       .81   $      1.65     $       .74(2)(3)  $       1.01
</TABLE>
 
- ---------------
(1) The per square foot calculations as of December 31, 1996 are calculated
    taking the total dollars anticipated to be expended on tenant improvements
    in process as of December 31, 1996, divided by the total square footage
    being improved or total building square footage. The actual amounts expended
    as of December 31, 1996 for revenue enhancing and non-revenue enhancing
    renewal and retenanted space were $30,587,000, $14,602,000 and $20,763,000,
    respectively.
 
(2) The per square foot calculations as of July 31, 1997 are calculated taking
    the total dollars anticipated to be expended on tenant improvements in
    process as of July 31, 1997, divided by the total square footage being
    improved or total building square footage. The actual amounts expended as of
    July 31, 1997 for revenue enhancing and non-revenue enhancing renewal and
    retenanted space were $8,700,000, $7,500,000 and $21,500,000, respectively.
 
(3) The amounts shown have been annualized to reflect a full year of comparable
    operation. The actual costs per square foot total as of July 31, 1997 for
    revenue enhancing and non-revenue enhancing renewal and retenanted space
    were $.21, $.23 and $.32, respectively.
 
                                       115
<PAGE>   124
 
OCCUPANCY
 
     The table below sets forth weighted average occupancy rates, based on
square feet occupied, of the EOP Office Properties owned by EOP at the indicated
dates:
 
<TABLE>
<CAPTION>
                                                                                      PERCENTAGE OF
                                                                   AGGREGATE         RENTABLE SQUARE
DATE                                                          RENTABLE SQUARE FEET    FEET OCCUPIED
- ----                                                          --------------------   ---------------
<S>                                                           <C>                    <C>
December 31, 1992...........................................        9,095,684              73%
December 31, 1993...........................................       13,550,553              80
December 31, 1994...........................................       18,505,591              88
December 31, 1995...........................................       23,097,222              86
December 31, 1996...........................................       29,127,289              90
September 30, 1997..........................................       33,406,977              93
</TABLE>
 
DEBT FINANCING
 
     As of September 30, 1997, EOP had outstanding existing long-term
indebtedness in an aggregate principal amount of $1.7 billion, of which $427
million or 25% had a floating interest rate. EOP's fixed rate debt had a
weighted average interest rate of 7.56% and a weighted average maturity of 76
months. As of such date, EOP's floating rate debt bore interest at a weighted
average rate of 6.86%. EOP's overall weighted average interest rate as of
September 30, 1997 was 7.39%.
 
     EOP has previously entered into interest rate hedging arrangements for
approximately $1 billion of its floating rate debt in order to protect itself
from rising interest rates. Excluding the $600 million Credit Facility that EOP
entered into upon consummation of the Consolidation and an additional $44
million in debt, EOP's total debt as of the date hereof is principally comprised
of (i) fixed rate loans or (ii) floating rate loans subject to interest rate
hedging arrangements that will limit EOP's exposure to rising interest rates.
See "RISK FACTORS -- Debt Financing."
 
REALTY TAXES
 
     As of September 30, 1997, the EOP Properties were subject to realty tax
rates ranging from approximately 1% to approximately 7.9% of assessed value. For
the year ended December 31, 1996, EOP incurred approximately $52.2 million in
annual realty taxes. EOP does not expect proposed improvements to previously
improved space to materially affect the amount of realty taxes.
 
LEGAL PROCEEDINGS
 
     Neither EOP nor any of the EOP Properties is presently subject to any
material litigation nor, to EOP's knowledge, is any litigation threatened
against EOP, or any of the EOP Properties, other than routine actions for
negligence and other claims and administrative proceedings arising in the
ordinary course of business, some of which are expected to be covered by
liability insurance and all of which collectively are not expected to have a
material adverse effect on the liquidity, results of operations, or business or
financial condition of EOP.
 
                                       116
<PAGE>   125
 
                               BUSINESS OF BEACON
 
GENERAL
 
     Beacon was formed in May 1994 to continue and expand the office and
commercial real estate business of the Beacon Group, a real estate company
founded in 1946 by Norman Leventhal and Robert Leventhal. Currently, Beacon owns
and operates 126 income producing commercial properties encompassing
approximately 20.7 million rentable square feet. The Beacon Properties are
located throughout the United States in 10 submarkets in six markets in five
states and the District of Columbia. Through the Beacon Management Company,
Beacon manages an additional three commercial properties, containing
approximately 2.2 million rentable square feet, owned by third-parties
(including, in the case of one such property, an affiliate of Beacon).
 
     As of September 30, 1997, the Beacon Properties were approximately 97%
leased by a total of approximately 1,280 tenants with no single tenant
accounting for more than 4.0% of the annualized rent. As of June 30, 1997, the
Beacon Properties contained an average of 158,106 rentable square feet. As of
September 30, 1997, Beacon Properties, by number of buildings, are located 14%
in CBDs and 86% in suburban markets and, by rentable square feet, 32% in CBDs
and 68% in suburban markets.
 
OPERATIONS
 
     The operations of the Beacon Properties are under the direction of three
Chief Executives, each of whom has responsibility directing the growth and
operations of the Beacon Properties in his respective region. Each region has
strategic and budget planning responsibility, as well as due diligence, property
management, engineering/construction and leasing/marketing expertise. Each
regional manager reports to Beacon's Chief Operating Officer.
 
OPERATIONAL STRUCTURE
 
     All of Beacon's business is conducted through the Beacon Partnership and
its Subsidiaries. The Beacon Partnership owns, directly or indirectly, each of
the wholly owned Beacon Properties. The Beacon Partnership owns only a partial
interest in the Center Plaza property, the One Post Office Square property, the
Rowes Wharf property, the Polk and Taylor Buildings property, and the 75-101
Federal Street property (the "Beacon Joint Venture Properties"). Consequently,
Beacon is not in a position to exercise sole decision-making authority regarding
the Beacon Joint Venture Properties.
 
     Beacon conducts third party management operations through the Beacon
Management Company and conducts third party tenant space design services through
the Beacon Design Company. Through the Beacon Management Company, Beacon manages
three properties comprising approximately 2.2 million square feet of commercial
office space owned by third parties, as well as the Beacon Joint Venture
Properties. The Beacon Partnership owns 1% of the voting stock and 100% of the
non-voting stock (collectively representing 99% of the economic value) of each
of the Beacon Service Companies. The Beacon Service Companies also own Beacon's
interest in the Rowes Wharf Property.
 
     Beacon conducts management operations for wholly-owned properties through
Beacon Property Management, L.P., a Delaware limited partnership, and conducts
tenant space design services for wholly-owned properties through Beacon Design,
L.P., a Delaware limited partnership.
 
RECENT DEVELOPMENTS
 
     ACQUISITIONS.  Since September 30, 1997, Beacon has completed a number of
new acquisitions.
 
     In October 1997, Beacon acquired a 44-story office tower located at 20
North Wacker Drive in Chicago, Illinois (the "Civic Opera Building") for
aggregate consideration of approximately $59.6 million, of which approximately
$21.1 million would be in cash, $6.7 million would be in the form of operating
partnership units, and the balance by taking subject to a $31.8 million existing
mortgage. The Civic Opera Building is comprised of approximately 824,000
rentable square feet. Originally built in 1929, the building has undergone
 
                                       117
<PAGE>   126
 
approximately $10 million of renovation since 1994. As of the date of
acquisition, the building was approximately 93% occupied.
 
     In October 1997, Beacon acquired an office property located at 200 West
Adams in Chicago, Illinois ("200 West Adams") for aggregate consideration of
approximately $72.2 million. Completed in 1985, the 200 West Adams property is
comprised of approximately 677,000 rentable square feet, including approximately
12,500 square feet of retail space. As of the date of acquisition, the building
was approximately 92% occupied.
 
     In October 1997, Beacon acquired the Lakeside Office Park, an office
complex located in Atlanta, Georgia ("Lakeside") for aggregate consideration of
approximately $38 million in cash. Lakeside was developed from 1972 to 1978 and
has been refurbished over the past three years. Lakeside consists of five
buildings containing a total of 391,000 rentable square feet and, upon
acquisition, was approximately 92% occupied.
 
     In November, 1997, Beacon entered into an Agreement for Purchase and Sale
of Partnership Interest with Dai-ichi Life Property Holdings, Inc. and Dai-ichi
Life Capital Properties, Inc. (collectively, "Dai-ichi") to purchase Dai-ichi's
50% interest in a 23-story office building located at 101 North Wacker Drive in
Chicago, Illinois for approximately $29.5 million. Beacon previously entered
into an Agreement for Purchase and Sale of Partnership Interest with
Metropolitan Life Insurance Company ("MetLife"), Dai-ichi's joint venturer in
the Property, to purchase MetLife's 50% interest in the property. Dai-ichi has
waived its first refusal option to purchase MetLife's 50% interest in the
Property. The Agreement for Purchase and Sale of Partnership Interest with
Dai-ichi is subject to the right of MetLife to exercise a first refusal option
to purchase Dai-ichi's 50% interest in the property.
 
     DEVELOPMENTS.  Since September 30, 1997, Beacon has announced the following
development project.
 
     In October 1997, Beacon purchased a parcel of land from CALPROP, L.P. for
$10.6 million with the plan to develop a 22-story, 207,000 square feet office
tower at 150 California Street in San Francisco, California.
 
                                       118
<PAGE>   127
 
                      BEACON PARTNERSHIP SELECTED COMBINED
                             FINANCIAL INFORMATION
 
     The following table sets forth selected financial and operating information
for Beacon Partnership and on a combined historical basis for Beacon Partnership
and The Beacon Group (the "Beacon Predecessor"). The consolidated results of
operations for the nine months ended September 30, 1997 and 1996 have been
derived from unaudited financial statements. The consolidated results of
operations of Beacon Partnership for the years ended December 31, 1996 and 1995
and for the period from May 26, 1994 to December 31, 1994, the combined results
of operations of the Beacon Predecessor for the period from January 1, 1994 to
May 25, 1994 and the combined historical operating information of the Beacon
Predecessor for the years ended December 31, 1993 and 1992 have been derived
from the financial statements audited by Coopers & Lybrand L.L.P., independent
accountants, whose report with respect to the years 1992 through 1996 is
included elsewhere in this Proxy Statement/Prospectus.
'
 
                                       119
<PAGE>   128
 
                            SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
                                                                                 BEACON PARTNERSHIP
                                                    -----------------------------------------------------------------------------
                                                     NINE MONTHS     NINE MONTHS    FOR THE YEAR   FOR THE YEAR   FOR THE PERIOD
                                                        ENDED           ENDED          ENDED          ENDED       MAY 26, 1994 TO
                                                    SEPTEMBER 30,   SEPTEMBER 30,   DECEMBER 31,   DECEMBER 31,    DECEMBER 31,
                                                        1997            1996            1996           1995            1994
                                                    -------------   -------------   ------------   ------------   ---------------
                                                             (UNAUDITED)
                                                                   (DOLLARS IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
<S>                                                 <C>             <C>             <C>            <C>            <C>
OPERATING INFORMATION:
Revenues:
Rental Income.....................................   $   218,544     $    97,308    $   147,825    $    69,781      $    23,702
Management fees...................................         2,445           2,248          3,005          2,203               --
Recoveries from tenants...........................        29,376          11,001         16,719          9,524            4,395
Mortgage interest income..........................         5,320           3,567          4,970          2,546               --
Other income......................................        10,350           7,567         11,249          5,985            2,671
                                                     -----------     -----------    -----------    -----------      -----------
   Total Revenue..................................       266,035         121,691        183,768         90,039           30,768
                                                     -----------     -----------    -----------    -----------      -----------
Expenses:
Property expenses.................................        51,169          24,607         37,210         17,698            6,497
Real estate taxes.................................        27,960          12,491         18,124          9,950            3,015
General and administrative........................        27,920          11,828         19,218          9,444            2,943
Mortgage interest expense.........................        36,313          20,739         30,300         15,220            4,970
Interest -- amortization of financing costs.......         1,131           1,618          2,084          1,370              617
Depreciation and amortization.....................        50,756          21,726         33,170         17,233            6,727
                                                     -----------     -----------    -----------    -----------      -----------
   Total Expenses.................................       195,249          93,009        140,106         70,915           24,769
                                                     -----------     -----------    -----------    -----------      -----------
Income (loss) from operations.....................        70,786          28,682         43,662         19,124            5,999
Equity (loss) in joint ventures and
 corporations(1)..................................         4,940           3,836          4,899          3,103              858
                                                     -----------     -----------    -----------    -----------      -----------
Income (loss) from continuing operations before
 minority interest................................        75,726          32,518         48,561         22,227            6,857
Minority interest in partnerships and
 corporations.....................................            --              --            (15)           (36)              (8)
                                                     -----------     -----------    -----------    -----------      -----------
Income (loss) from continuing operations..........        75,726          32,518         48,546         22,191            6,849
Discontinued Beacon Construction Company
 Income (loss) from operations....................        (2,263)         (1,911)        (2,609)           (12)             477
 Loss on sale.....................................            --              --           (249)            --               --
Gain on sale of property..........................        16,736              --             --             --               --
                                                     -----------     -----------    -----------    -----------      -----------
Income (loss) before extraordinary items..........        90,199          30,607         45,688         22,179            7,326
Extraordinary items...............................        (2,635)         (3,876)        (3,876)            --               --
                                                     -----------     -----------    -----------    -----------      -----------
Net income (loss).................................   $    87,564     $    26,731    $    41,812    $    22,179      $     7,326
                                                     ===========     ===========    ===========    ===========      ===========
Per unit data:
 Income before extraordinary items................   $      1.42     $      0.99    $      1.32    $      1.09      $      0.48
 Extraordinary items..............................         (0.04)          (0.13)         (0.11)            --               --
                                                     -----------     -----------    -----------    -----------      -----------
 Net income.......................................   $      1.38     $      0.86    $      1.21    $      1.09      $      0.48
                                                     ===========     ===========    ===========    ===========      ===========
 Distributions declared...........................   $     1.425     $    1.3025    $     1.765    $      1.24      $      0.96
 Distributions paid...............................   $     1.425     $    1.3025    $     1.765    $      1.64      $      0.56
 Weighted average units outstanding...............    59,443,531      30,955,399     34,446,907     20,323,327       15,270,899
 
<CAPTION>
                                                            BEACON PREDECESSORS
                                                    ------------------------------------
                                                    FOR THE PERIOD        YEAR ENDED
                                                    JANUARY 1, 1994      DECEMBER 31,
                                                      TO MAY 25,       -----------------
                                                         1994           1993      1992
                                                    ---------------    -------   -------
 
                                                    (DOLLARS IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
<S>                                                 <C>                <C>       <C>
OPERATING INFORMATION:
Revenues:
Rental Income.....................................      $5,776         $14,315   $11,406
Management fees...................................       1,521           3,533     3,331
Recoveries from tenants...........................       1,040           2,349     1,989
Mortgage interest income..........................          --              --        --
Other income......................................         675           2,176     2,003
                                                        ------         -------   -------
   Total Revenue..................................       9,012          22,373    18,729
                                                        ------         -------   -------
Expenses:
Property expenses.................................       2,086           4,580     4,522
Real estate taxes.................................         595           1,354     1,204
General and administrative........................       1,399           4,357     4,658
Mortgage interest expense.........................       2,798           7,650     7,203
Interest -- amortization of financing costs.......         373             192       138
Depreciation and amortization.....................       2,385           5,577     5,505
                                                        ------         -------   -------
   Total Expenses.................................       9,636          23,710    23,230
                                                        ------         -------   -------
Income (loss) from operations.....................        (624)         (1,337)   (4,501)
Equity (loss) in joint ventures and
 corporations(1)..................................         198          (5,953)   (1,544)
                                                        ------         -------   -------
Income (loss) from continuing operations before
 minority interest................................        (426)         (7,290)   (6,045)
Minority interest in partnerships and
 corporations.....................................         931           1,539     2,656
                                                        ------         -------   -------
Income (loss) from continuing operations..........         505          (5,751)   (3,389)
Discontinued Beacon Construction Company
 Income (loss) from operations....................         102             440       136
 Loss on sale.....................................          --              --        --
Gain on sale of property..........................          --              --        --
                                                        ------         -------   -------
Income (loss) before extraordinary items..........         607          (5,311)   (3,253)
Extraordinary items...............................       8,898           1,554
                                                        ------         -------   -------
Net income (loss).................................      $9,505         $(3,757)  $(3,253)
                                                        ======         =======   =======
Per unit data:
 Income before extraordinary items................          --              --        --
 Extraordinary items..............................          --              --        --
                                                        ------         -------   -------
 Net income.......................................
                                                        ======         =======   =======
 Distributions declared...........................          --              --        --
 Distributions paid...............................          --              --        --
 Weighted average units outstanding...............          --              --        --
</TABLE>
 
                                       120
<PAGE>   129
<TABLE>
<CAPTION>
                                                                  BEACON PARTNERSHIP
                                      --------------------------------------------------------------------------
                                                                                                      FOR THE
                                                                                                       PERIOD
                                       NINE MONTHS     NINE MONTHS    FOR THE YEAR   FOR THE YEAR     MAY 26,
                                          ENDED           ENDED          ENDED          ENDED         1994 TO
                                      SEPTEMBER 30,   SEPTEMBER 30,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                          1997            1996            1996           1995           1994
                                      -------------   -------------   ------------   ------------   ------------
                                       (UNAUDITED)     (UNAUDITED)
 
                                                   (DOLLARS IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
<S>                                   <C>             <C>             <C>            <C>            <C>
BALANCE SHEET INFORMATION:
Real estate before accumulated
  depreciation......................   $2,370,759      $1,061,413     $ 1,691,530     $ 471,142      $ 385,852
Total assets........................    2,470,954       1,142,378       1,778,913       534,723        385,565
Mortgage debt.......................      586,925         440,525         452,212        70,536         90,936
Note Payable, Beacon Credit
  Facility..........................      249,000          18,000         153,000       130,500        130,300
Total liabilities...................      910,720         508,727         671,283       239,009        260,468
Total partners capital..............    1,223,812         633,651       1,107,630       295,714        139,691
OTHER DATA:
Funds from Operations (FFO) after
  allocation of Series A
  Preferred Unit Distributions(2)...   $  121,928      $   55,343     $    83,154     $  41,913      $  17,262
Cash Flows provided by (used by):
  Operating activities..............      119,288          59,618          92,232        32,963         11,155
  Investing activities..............     (545,909)       (521,776)     (1,097,870)     (145,924)      (233,830)
  Financing activities..............      424,126         470,438       1,037,053       102,636        237,481
Ratios:
  Interest Coverage(3)(5)...........          3.7             3.0             3.1           3.1            2.7
  Fixed Charge Coverage(4)(5).......          3.2             2.9             2.9           2.9            2.6
  Debt to Total Assets..............         33.8%           40.1%           34.0%         37.6%          57.4%
  Secured Debt to Total Assets......         23.8%           40.1%           34.0%         37.6%          57.4%
  Unencumbered Assets to Total
    Unsecured Debt..................          5.5             n/a             n/a           n/a            n/a
- ---------------
(1) Including deductions for:
     Depreciation and
       amortization.................   $    3,086      $    2,999     $     4,033     $   2,306      $   3,013
     Interest-amortization of
       financing cost...............   $      673      $      673     $       898     $     853      $     796
 
<CAPTION>
                                           BEACON PREDECESSOR
                                     -----------------------------------
                                      FOR THE PERIOD     YEAR ENDED   
                                        JANUARY 1,      DECEMBER 31,  
                                     1994 TO MAY 25,   -------------- 
                                         1994         1993       1992 
                                         ----         ----       ----
<S>                                   <C>          <C>        <C>
BALANCE SHEET INFORMATION:
Real estate before accumulated
  depreciation......................   $ 82,198    $ 81,220   $ 78,580
Total assets........................     77,470      85,497     93,327
Mortgage debt.......................     69,240      87,091     86,610
Note Payable, Beacon Credit
  Facility..........................         --          --         --
Total liabilities...................    129,836     143,451    142,015
Total partners capital..............    (52,366)    (57,954)   (48,688)
OTHER DATA:
Funds from Operations (FFO) after
  allocation of Series A
  Preferred Unit Distributions(2)...         --          --         --
Cash Flows provided by (used by):
  Operating activities..............        241       5,408     10,069
  Investing activities..............     (1,102)     (9,890)    (2,091)
  Financing activities..............       (716)       (830)    (3,983)
Ratios:
  Interest Coverage(3)(5)...........         --          --         --
  Fixed Charge Coverage(4)(5).......         --          --         --
  Debt to Total Assets..............         --          --         --
  Secured Debt to Total Assets......         --          --         --
  Unencumbered Assets to Total
    Unsecured Debt..................         --                     --
- ---------------
(1) Including deductions for:
     Depreciation and
       amortization.................
     Interest-amortization of
       financing cost...............
</TABLE>
 
(2) Beacon Partnership believes that to facilitate a clear understanding of the
    operating results of Beacon Partnership, Funds from Operations ("FFO")
    should be examined in conjunction with net income. The definition of FFO was
    clarified in the NAREIT White Paper, adopted by the NAREIT Board of
    Governors on March 3, 1995, as net income (computed in accordance with GAAP,
    excluding gains (or losses) from debt restructuring and sales of property,
    plus depreciation and amortization (in each case only real estate related
    assets), and after adjustments for unconsolidated partnerships and joint
    ventures. Adjustments for unconsolidated partnerships and joint ventures
    will be calculated to reflect FFO on the same basis. FFO should not be
    considered as a substitute for net income as an indication of Beacon
    Partnership's performance or as a substitute for cash flow as a measure of
    its liquidity. Beacon Partnership's method of calculating FFO may be
    different from methods used by other companies.
 
(3) For purposes of computing the ratio of EBITDA to interest expense, EBITDA
    represents earnings before interest, taxes, depreciation and amortization.
    interest expense includes Beacon Partnership's pro rata share of joint
    venture interest expense.
 
                                       121
<PAGE>   130
 
(4) For purposes of computing the ratio of EBITDA to fixed charges, EBITDA
    represents earnings before interest, taxes, depreciation and amortization.
    Fixed charges consist of interest costs, whether expensed or capitalized and
    including Beacon Partnership's pro rata share of joint venture interest
    expense, principal amortization including Beacon Partnership's pro rata
    share of joint venture principal amortization, plus any distributions on
    outstanding preferred units.
 
(5) EBITDA (i) does not represent cash flow from operations as defined by GAAP,
    (ii) should not be considered as an alternative to net income (determined in
    accordance with GAAP) as a measure of operating performance; and (iii) is
    not an alternative to cash flows as a measure of liquidity. Beacon
    Partnership's management believes that in addition to cash flows and net
    income, EBITDA is a useful financial performance measurement for assessing
    the operating performance of a company because, together with net income and
    cash flows, EBITDA provides investors with an additional basis to evaluate
    the ability of a company to incur and service debt and to fund acquisitions
    and other capital expenditures. To evaluate EBITDA and the trends it
    depicts, the components of EBITDA, such as revenues and operating expenses,
    should be considered. Beacon Partnership's method of calculating EBITDA may
    be different from the methods used by other companies.
 
                                       122
<PAGE>   131
 
           BEACON PARTNERSHIP MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
     The following discussion should be read in conjunction with Beacon
Partnership's Consolidated Financial Statements and Notes thereto included
elsewhere herein. The discussion in this section contains forward-looking
statements within the meaning of Section 27A of the Securities Act of 1933, as
amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The
words "believe", "expect", "anticipate", "intend", "estimate" and other
expressions which are predictions of or indicate future events and trends and
which do not relate to historical matters identify forward-looking statements.
Beacon Partnership's actual results could differ materially from those set forth
in the forward-looking statements. Factors that could cause actual results to
differ materially from those set forth in the forward-looking statements include
general economic conditions, local real estate conditions, timely releasing of
occupied square footage upon expiration, interest rates, availability of equity
and debt financing and other risks detailed from time to time in Beacon
Partnership's filings with the Securities and Exchange Commission, including
quarterly reports on Form 10-Q, reports on Form 8-K and annual reports on Form
10-K.
 
     As a result of the significant acquisitions by Beacon Partnership and its
use of the equity method of accounting for the management, design and
construction corporations, while the Predecessor consolidated these entities,
the operating results of Beacon Partnership and Predecessor are not directly
comparable.
 
RESULTS OF OPERATIONS
 
COMPARISON OF THREE AND NINE MONTHS ENDED SEPTEMBER 30, 1997 AND SEPTEMBER 30,
1996
 
     Beacon Partnership's gross revenues increased by 119% for the nine months
ended September 30, 1997 compared to the corresponding period in 1996. The
growth in gross revenues was primarily the result of the acquisition of 89
Properties (the "Beacon Acquisition Properties") comprising 12.6 million square
feet during 1996 and 1997 offset by the sale of the Westlakes Office Park
Property in May 1997. Beacon Partnership's proportionate share of weighted
average square feet of office properties increased by 96% to 15.5 million square
feet for the nine months ended September 30, 1997, compared to 7.9 million
square feet for the corresponding period in 1996.
 
     The Beacon Acquisition Properties increased revenues from rental
operations, which includes rental income, recoveries from tenants and other
income, by $54,9 and $140.6 million for the three and nine months ended
September 30, 1997, respectively, compared to the corresponding periods in 1996.
The remaining balance of the increase was primarily due to increases in
occupancy and rental rates and completion of the redevelopment and achievement
of 88% occupancy at the Crosby Corporate Center in 1996 offset by the decrease
in revenues as a result of the sale of Westlakes Office Park.
 
     The impact of the straight-line rent adjustment increased consolidated
revenues for the Beacon Partnership by $14.3 million for the nine months ended
September 30, 1997 and $4.1 million for the corresponding period in 1996. The
impact of the straight-line rent adjustment increased Beacon Partnership's
equity in net income of property joint ventures and corporations by $0.1 million
for the nine months ended September 30, 1997 and $0.1 million for the
corresponding period in 1996.
 
     The impact of the straight-line rent adjustment increased consolidated
revenues for Beacon Partnership by $6.2 million for the three months ended
September 30, 1997 and $1.6 million for the corresponding period in 1996. The
impact of the straight-line rent adjustment increased Beacon Partnership's
equity in net income of property joint ventures and corporations by $0.1 million
for the three months ended September 30, 1997 and $0.1 million for the
corresponding period in 1996.
 
     Mortgage interest income for the three and nine months ended September 30,
1997 was $2.6 and $5.3 million, respectively, compared to $1.4 and $3.6 million
for corresponding periods in 1996. The increase is the result of Beacon
Partnership's acquisition of the remaining portions of the outstanding first
mortgage indebtedness on the Rowes Wharf Property in April and June 1996,
recognition of $0.9 million of accretion in
 
                                       123
<PAGE>   132
 
the carrying value of the Rowes Wharf debt and interest on Beacon Partnership's
loans to certain affiliates of Beacon Partnership used to acquire a parcel of
land located in Newton, Massachusetts.
 
     The Beacon Acquisition Properties increased property expenses, real estate
taxes and depreciation and amortization by $26.7 and $68.6 million for the three
and nine months ended September 30, 1997, respectively, compared to the
corresponding periods in 1996. The remaining balance of the increase was
primarily due to additional operating expenses as a result of an increase in
occupancy and the completion of the redevelopment and achievement of 88%
occupancy at the Crosby Corporate Center in 1996 offset by the decrease in
expenses as a result of the sale of the Westlakes Office Park.
 
     General and administrative expenses were $10.2 and $28.0 million for the
three and nine months ended September 30, 1997, respectively, compared to $4.5
and $11.8 million for the corresponding periods in 1996. The Beacon Acquisition
Properties increased general and administrative expenses by $1.7 and $4.4
million for the three and nine month periods, respectively. The remaining
balance of the increase was primarily due to an increase in corporate management
and administrative costs. In 1996, Beacon Partnership established its first
regional offices in the Southeast and Mid-Atlantic and in the first quarter of
1997 regional offices in the Midwest and West were established. As a result,
payroll expense increased by $5.8 million for the nine months ended September
30, 1997, along with an increase in other corporate and regional general and
administrative expenses. In addition, legal expense increased by $1.3 million
primarily due to legal costs incurred in connection with the defense of a
lawsuit by a limited partner of Beacon Partnership which was settled in August
1997. Beacon Partnership did not pay any of the settlement amount, General and
administrative expenses as a percentage of total revenue were 10.5% for the nine
months ended September 30, 1997 compared to 9.7% for the corresponding period in
1996.
 
     Net operating income (excluding the effect of straight-line rents) for
properties owned for at least a full year (consisting of 55 properties with 9.2
million square feet for the nine months ended and 20 properties with 5.9 million
square feet for the three months ended) increased 7.6% and 6.4% for the three
and nine months ended September 30, 1997, respectively, compared to the
corresponding periods in 1996.
 
     Mortgage interest expense was $13.7 and $36.3 million for the three and
nine months ended September 30, 1997, respectively, compared to $7.1 and $20.7
million for the corresponding periods in 1996. The increase in both periods was
primarily the result of debt incurred or assumed in connection with several of
the Beacon Acquisition Properties and an increase in the weighted average
outstanding balance of the Beacon Credit Facility.
 
     Interest-amortization of financing costs was $0.4 and $1.1 million for the
three and nine months ended September 30, 1997, respectively, compared to $0.4
and $1.6 million for the corresponding periods in 1996. The decrease was
primarily the result of the reduction in amortization of financing costs of the
Beacon Credit Facility as a result of the write-off of fees and costs of the
Beacon Credit Facility which was substantially modified in both September 1996
and April 1997.
 
     Equity in net income of joint ventures and corporations was $1.7 and $4.9
million for the three and nine months ended September 30, 1997, respectively,
compared to $1.3 and $3.8 million for the corresponding periods in 1996. The
increase was primarily the result of a lease termination fee recognized in 1997
by 75-101 Federal Street as well as increases in rental income at Polk and
Taylor and One Post Office Square properties.
 
     Loss from discontinued operations from the Construction Company was $0.8
and $2.3 million for the three and nine months ended September 30, 1997,
respectively, compared to $0.8 and $1.9 million for the corresponding periods in
1996. In December 1996, substantially all of the assets of the Construction
Company were sold to Skanska AB, a Swedish construction firm. The Construction
Company's new business plan involves the completion of certain contracts not
transferred to the purchaser and the liquidation of its remaining assets.
 
     In May 1997, the Operating Partnership sold the Westlakes Office Park
property, its sole property located in Berwyn (suburban Philadelphia),
Pennsylvania for approximately $72.5 million and recorded a gain on the sale of
the property of $16.7 million.
 
                                       124
<PAGE>   133
 
     Extraordinary items were $2.6 million for the nine months ended September
30, 1997, compared to $3.9 million for the corresponding period in 1996. In
1997, Beacon Partnership recorded an extraordinary item in connection with the
write-off of fees and costs of the secured Credit Facility which was replaced
with an unsecured facility in April 1997. In March 1996, Beacon Partnership
recorded an extraordinary item of $2.2 million in connection with the write-off
of fees and costs to acquire a $260 million mortgage loan provided by
PaineWebber Real Estate Securities, Inc. used to acquire the Perimeter Center
Portfolio (the "PaineWebber Acquisition Loan"). The PaineWebber Acquisition Loan
was recorded in connection the write-off of fees and costs of the Beacon Credit
Facility which was substantially modified in September 1996.
 
COMPARISON OF FISCAL YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994
 
     For discussion purposes, the results of operations for the year ended
December 31, 1994 combine the operating results of the Predecessor for the
period January 1, 1994 to May 25, 1994 and the operating results of Beacon
Partnership for the period May 26, 1994 to December 31, 1994.
 
     Beacon Partnership's gross revenues increased by 104% from 1995 to 1996 and
126% from 1994 to 1995. The growth in gross revenues was primarily the result of
the acquisition of 78 Properties comprising 9.1 million square feet in 1996, 5
Properties comprising 1.4 million square feet in 1995, and 6 Properties
comprising 0.9 million square feet in 1994.
 
     The acquisition properties increased revenues from rental operations, which
includes rental income, recoveries from tenants and other income, by $81.7
million from 1995 to 1996 and $47.2 million from 1994 to 1995. The remaining
balance of the increase was primarily due to increase in occupancy and rental
rates, completion of the redevelopment and achievement of 88% occupancy of the
Crosby Corporate Center in 1996 and interest income earned on cash reserves.
 
     The impact of the straight-line rent adjustment increased consolidated
revenues for Beacon Partnership by $6.6 million in 1996, $3.7 million in 1995
and $1.9 million for the period May 26, 1994 to December 31, 1994. The impact of
the straight-line rent adjustment increased Beacon Partnership's equity in net
income of property joint ventures and corporations by $0.1 million in 1996, $0.2
million in 1995 and $0.3 million for the period May 26, 1994 to December 31,
1994.
 
     Management fees were $3.0 million in 1996, $2.2 million in 1995 and $1.5
million in 1994. The increase from 1995 to 1996 of $0.8 million is the result of
the management contract for 75-101 Federal Street, a Property in the which
Beacon Partnership purchased an approximate 51% interest in September 1995. The
increase from 1994 to 1995 of $0.7 million is the result of Beacon Property
Management, L.P., a fully consolidated entity, managing the joint venture
properties effective January 1, 1995. In 1994, Beacon Management Company, an
entity accounted for under the equity method, managed the joint venture and
unrelated third-party properties. The Beacon Predecessor reported the results of
operations of the management of joint venture and unrelated third-party
properties in revenues and expenses in its combined financial statements.
 
     Mortgage interest income for 1996 was $5.0 million and $2.5 million for
1995. The increase of $2.5 million is the result of Beacon Partnership's
acquisition of the remaining portions of the outstanding first mortgage
indebtedness on the Rowes Wharf Property in 1996 and a full year of interest
income in 1996 from those portions of the Rowes Wharf debt purchased in 1995. If
Beacon Partnership had owned all of its share of the Rowes Wharf debt for a full
year in 1996, mortgage interest income would have been $5.6 million.
 
     The acquisition properties increased property expenses, real estate taxes
and depreciation and amortization by $37.2 million from 1995 to 1996 and $24
million from 1994 to 1995. The remaining balance was primarily due to increased
operating expenses as a result of an increase in occupancy and the completion of
the redevelopment and achievement of 88% occupancy at the Crosby Corporate
Center in 1996.
 
     General and administrative expenses were $19.2 million in 1996, $9.4
million in 1995 and $4.3 million in 1994. The acquisition properties increased
general and administrative expenses by $3.7 million from 1995 to 1996 and $3.8
million from 1994 to 1995. The remaining balance of the increase was primarily
due to an increase in corporate management and administrative costs with the
largest increase in payroll expense of $2.2
 
                                       125
<PAGE>   134
 
million and rent expense of $1 million. The increase in corporate management and
administrative costs was the result of the growth of Beacon Partnership's
portfolio of properties and the opening of the first regional office in Atlanta
in 1996. General and administrative expenses as a percentage of total revenue
was 10.5% in 1995 and 1996 and 10.9% in 1994.
 
     Mortgage interest expense was $30.3 million in 1996, $15.2 million in 1995
and $7.8 million in 1994. The increase of $15.1 million from 1995 to 1996 is
primarily the result of debt incurred or assumed in connection the acquisition
of the Perimeter Center Portfolio and the Fairfax County Portfolio. Interest
expense associated with the mortgage debt placed on the Wellesley Office Park
and Center Plaza Properties in 1996 was offset by a reduction of interest
expense on the Beacon Credit Facility as a result of the proceeds being used to
pay down the balance of the Beacon Credit Facility. The increase of $7.4 million
from 1994 to 1995 is primarily due to the interest on the Beacon Credit Facility
and debt assumed in connection with the acquisition of 150 Federal Street and
the remaining joint venture interest in 175 Federal Street offset by the
decrease in interest expense as a result of the discharge of mortgage debt in
connection with the formation of Beacon Partnership. The weighted average
balance outstanding of the Beacon Credit Facility was $42.3 million for 1996,
$99.7 million for 1995 and $50.4 million for the period May 26, 1994 to December
31, 1994.
 
     Interest-amortization of financing costs was $2.1 million in 1996, $1.4
million in 1995 and $1 million in 1994. The increase of $0.7 million from 1995
to 1996 was primarily the result of amortization of financing costs associated
with the Beacon Credit Facility, the mortgage debt on Wellesley Office Park,
Center Plaza and the Perimeter Center Portfolio. The increase of $0.4 million
from 1994 to 1995 is primarily the result of the amortization of financing costs
associated with the Beacon Credit Facility offset by the write-off of financing
costs by the Beacon Predecessor as a result of the discharge of mortgage debt in
connection with the formation of Beacon Partnership.
 
     Equity in net income of joint ventures and corporations was $4.9 million in
1996, $3.1 million in 1995 and $1.1 million in 1994. The increase of $1.8
million from 1995 to 1996 was primarily the result of the acquisition of the
equity investment in 75-101 Federal Street in September 1995. The increase of $2
million from 1994 to 1995 is primarily the result of a reduction in the equity
in net loss from the Center Plaza Property as a result of Beacon Partnership
acquiring its debt, a controlling interest and fully consolidating the Property
effective December 1, 1994. Increases in equity in net income of One Post Office
Square and Polk and Taylor, as well as a new equity investment in 75-101 Federal
Street, were offset by the decrease in equity in net income from Wellesley
Office Park Building Six, 175 Federal Street and Beacon Management Company.
 
     Loss (income) from discontinued operations from Beacon Construction Company
was a $2.6 million loss in 1996, a $0.1 million loss in 1995 and $0.5 million
income in 1994. The increase in loss of $2.5 million from 1995 to 1996 was
primarily the result of several significant subcontractors working on
construction contracts in Atlanta seeking bankruptcy and not completing their
work. As a result, Beacon Construction Company was forced to complete the
projects using additional contractors which increased the total costs of the
projects.
 
     In December 1996, substantially all of the assets of Beacon Construction
Company were sold to Skanska AB, a Swedish construction firm. In connection with
the sale, Beacon Partnership recorded its share of the loss of $0.2 million.
 
     As a result of transactions resulting in the formation of Beacon
Partnership (the "Beacon Formation Transactions"), no minority interest in the
combined partnerships was recorded after May 25, 1994, resulting in a decrease
compared to 1994 in minority interest in loss of combined partnerships.
 
     Extraordinary items were a $3.9 million loss in 1996 and a $8.9 million
gain in 1994. An extraordinary item of $2.2 million was recorded in connection
with the write-off of fees and costs to acquire the PaineWebber Acquisition Loan
which was repaid in March 1996 approximately three years prior to its maturity.
An extraordinary item of $1.7 million was recorded in connection with write-off
of fees and costs of the Beacon Credit Facility which was substantially modified
in June 1996. The extraordinary gain in 1994 relates to the settlement of
mortgage debt by the Beacon Predecessor on the Wellesley Office Park Buildings
One to Five and Seven as a condition of transfer prior to the Beacon Formation
Transactions.
 
                                       126
<PAGE>   135
 
LIQUIDITY AND CAPITAL RESOURCES
 
     Net cash provided by operating activities totaled $92.2 million in 1996,
$33 million in 1995 and $11.4 million in 1994. The increase in the periods was
primarily attributable to the incremental increase in cash flow from operations
provided by the acquisition properties as well as an increase in security
deposits, accrued interest, and prepaid rents.
 
     Net cash used by investing activities totaled $1,097.9 million in 1996,
$145.9 million in 1995 and $234.9 million in 1994. The increase from 1995 to
1996 was the result of the acquisition of Properties and the redevelopment of
the Crosby Corporate Center and Wellesley Building Eight in 1996. The decrease
from 1994 to 1995 was primarily a result of Beacon's May 1994 initial public
offering whereby Beacon Partnership acquired its initial portfolio of 15
Properties totaling 4.4 million square feet.
 
     Net cash provided by financing activities totaled $1,037.1 million in 1996,
$102.6 million in 1995 and $236.8 million in 1994. The increase from 1995 to
1996 was primarily due to an increase in public stock offerings of Beacon, the
proceeds of which were contributed to Beacon Partnership, and the closing of
mortgage debt on certain Properties. The decrease from 1994 to 1995 was
primarily attributable to the repayments on the Beacon Credit Facility in 1995.
 
     Cash and cash equivalents were $35.9 million at December 31, 1996 compared
to $4.5 million at December 31, 1995. The increase was primarily the result of
proceeds from 1996 public stock offerings of Beacon, the proceeds of which were
contributed to Beacon Partnership, in excess of the funds utilized for the 1996
acquisitions and the redevelopment of the Crosby Corporate Center and Wellesley
Eight Building.
 
INVESTING ACTIVITIES
 
     On February 15, 1996, Beacon Partnership acquired the Perimeter Center
Portfolio, a 3.3 million square foot, 32 building portfolio located in suburban
Atlanta, Georgia for approximately $322.2 million in cash and approximately
$13.8 million in Beacon Partnership Units.
 
     During the second quarter of 1996, Beacon Partnership and Equitable Life
Insurance Society of the United States, on behalf of its Prime Property Fund
("Equitable"), Beacon Partnership's partner in the Rowes Wharf Property,
acquired the remaining portion of the outstanding first mortgage indebtedness on
the Rowes Wharf Property that had been held by a bank lending group for $16.7
million. The mortgage debt was acquired at market value which was approximately
50% of the face value.
 
     On August 16, 1996, Beacon Partnership acquired the New York Life Portfolio
for approximately $150 million. The New York Life Portfolio consists of the AT&T
Plaza located in Oak Brook, Illinois, the five-building Tri-State International
office park located in Lincolnshire, Illinois and a property located at 1333 H
Street in Washington, D.C.
 
     On September 5, 1996, Beacon Partnership acquired the Fairfax County
Portfolio for aggregate consideration of $77 million consisting of assumption of
mortgage debt of approximately $55.5 million and the issuance of approximately
$21.5 million of Beacon Partnership Units. The Fairfax County Portfolio consists
of the John Marshall I building, the E.J. Randolph building, the Northridge I
building and a parcel of developable land.
 
     On October 18, 1996, Beacon Partnership acquired the Rosslyn, Virginia
Portfolio for aggregate consideration of approximately $99 million. The Rosslyn,
Virginia Portfolio consists of office buildings located at 1616 North Fort Myer
Drive and 1300 North 17th Street.
 
     On November 15, 1996, Beacon Partnership acquired the New England Executive
Park Portfolio for aggregate consideration of approximately $75 million. An
additional $17 million payment is payable on November 30, 1998, contingent upon
meeting conditions regarding occupancy or rental income levels at the Property
in 1998.
 
     On November 21, 1996, Beacon Partnership acquired the 10960 Wilshire
Boulevard Property located in Westwood, California for aggregate consideration
of approximately $133 million.
 
                                       127
<PAGE>   136
 
     On November 21, 1996, Beacon Partnership acquired 245 First Street located
in Cambridge, Massachusetts for aggregate consideration of approximately $45
million.
 
     On December 20, 1996, Beacon Partnership acquired the Shoreline Technology
Park and Lake Marriott Business Park located in suburban San Francisco for
aggregate consideration of approximately $183 million.
 
     On December 27, 1996, Beacon Partnership acquired the Presidents Plaza
Property for aggregate consideration of approximately $38 million in cash and
the issuance of approximately $39 million of Beacon Partnership Units.
 
FINANCING ACTIVITIES
 
     On January 9, 1996, Beacon Partnership converted $55 million of the Beacon
Credit Facility to permanent mortgage debt secured by the Wellesley Office Park
Properties.
 
     On February 9, 1996, Beacon Partnership converted $60 million of the Beacon
Credit Facility to permanent mortgage debt secured by the Center Plaza Property.
 
     On February 15, 1996, Beacon Partnership acquired the Perimeter Center
Portfolio using the proceeds of the $260 million PaineWebber Acquisition Loan
and the issuance of approximately $13.8 million of Beacon Partnership Units,
with the balance funded from the Beacon Credit Facility.
 
     In March 1996, Beacon sold 7,036,000 Beacon Common Shares to the public at
$26.25 per share and contributed the approximately $173.8 million net proceeds
of the offering to Beacon Partnership in exchange for 7,036,000 Beacon
Partnership Units. The net proceeds of the contribution were used to repay a
portion of the PaineWebber Acquisition Loan.
 
     On March 15, 1996, Beacon Partnership closed on the $218 million MetLife
Loan. The proceeds of the MetLife Loan were used to repay the remaining portion
of the PaineWebber Acquisition Loan and the outstanding balance of the Beacon
Credit Facility.
 
     In August 1996, Beacon sold 5,750,000 Beacon Common Shares to the public at
$25.75 per share and contributed the approximately $139.4 million net proceeds
of the offering to Beacon Partnership in exchange for 5,750,000 Beacon
Partnership Units. The net proceeds of the contribution were used to purchase
the New York Life Portfolio.
 
     In November 1996, Beacon sold 13,723,000 Beacon Common Shares to the public
at $30.75 per share. In addition, in December 1996, Beacon sold an additional
1,132,400 Beacon Common Shares at an offering price of $33.465 per share to the
underwriters of the November 1996 offering to cover a portion of their short
position resulting from over-allotments. Beacon contributed the approximately
$436.7 million net proceeds of these offerings to Beacon Partnership in exchange
for 14,855,400 Beacon Partnership Units. The net proceeds of these offerings
were used to purchase the various fourth quarter acquisitions with the balance
added to cash reserves.
 
     On December 23, 1996, Beacon Partnership refinanced the $16.5 million
mortgage loan on the Northridge I Property to a $13.6 million mortgage loan with
a 10-year term bearing interest at an annual rate of 8.19%. This mortgage loan
requires monthly installments of interest only in years one and two and
principal and interest during years three through ten based on a 25-year
amortization schedule.
 
     On December 23, 1996, Beacon Partnership also closed on a $15 million
mortgage loan on the E.J. Randolph Property, and used the net proceeds to pay
down the Beacon Credit Facility. On September 5, 1996, in connection with the
acquisition of the Property, Beacon Partnership paid off a $18 million mortgage
loan it assumed using a draw on the Beacon Credit Facility.
 
     On January 28, 1997, Beacon Partnership declared a distribution of $.4625
per Beacon Partnership Unit payable on February 28, 1997 to partners of record
on February 10, 1997.
 
                                       128
<PAGE>   137
 
CAPITALIZATION
 
     At December 31, 1996, Beacon Partnership's total consolidated debt was
approximately $605.2 million, and its total consolidated debt plus its
proportionate share of total unconsolidated debt (other than the Rowes Wharf
Property debt) was approximately $698.8 million. At December 31, 1996, Beacon
Partnership's outstanding consolidated debt consisted of approximately $153
million under the Beacon Credit Facility and approximately $452.2 million of
fixed rate mortgage indebtedness with a weighted average rate of 7.22%,
collateralized by Properties owned 100% by Beacon Partnership. Beacon
Partnership's proportionate share of its current total unconsolidated debt
(excluding the Rowes Wharf Property debt) consists of approximately $46.6
million on the One Post Office Square Property (in which Beacon Partnership has
a 50% general partner interest) and approximately $46.4 million on the 75-101
Federal Street Property (in which Beacon Partnership owns approximately 52% of
the common stock of a private REIT that owns the Property). The weighted average
rate of Beacon Partnership's unconsolidated fixed rate mortgage indebtedness is
7.47%. The weighted average rate of Beacon Partnership's consolidated and
unconsolidated fixed rate mortgage indebtedness is 7.27%.
 
     Based on Beacon Partnership's total market capitalization of $2,690.3
million at December 31, 1996 (at the December 31, 1996 closing stock price of
the Beacon Common Shares of $36.625), Beacon Partnership's consolidated debt
plus its proportionate share of total unconsolidated debt (other than the Rowes
Wharf Property debt) represented approximately 26% of its total market
capitalization.
 
     In June 1996, Beacon Partnership substantially modified the terms of the
Beacon Credit Facility. Additionally, in July 1996, the maximum loan amount
available under the Beacon Credit Facility was increased to $300 million. with a
maturity date of June 1999. Beacon Partnership has an interest rate protection
agreement through May 1997 with BankBoston, N.A. ("BankBoston") with respect to
$135 million of the Beacon Credit Facility, which provides for offsetting
payments to Beacon Partnership in the event that 90-day LIBOR exceeds 9.47% per
annum. Effective May 1997 through May 1999, Beacon Partnership has an interest
rate protection agreement with respect to $137.5 million of the Beacon Credit
Facility, which provides for offsetting payments to Beacon Partnership in the
event that 90-day LIBOR exceeds 8.75% per annum. This interest rate protection
arrangement may be applied during four quarters of the period from May 1997 to
May 1999.
 
     Beacon Partnership utilizes the Beacon Credit Facility primarily to finance
acquisitions of additional properties, although up to $30 million may be used
for working capital purposes and $2.5 million is reserved under certain
circumstances for capital expenditures. The Beacon Credit Facility is a recourse
obligation of Beacon Partnership, is guaranteed by Beacon and is secured by
cross-collateralized mortgages and assignments of rents on 29 of the Properties.
Beacon Partnership's ability to borrow under the Beacon Credit Facility is
subject to Beacon Partnership's compliance with a number of customary financial
and other covenants on an ongoing basis, including loan-to-value ratio against
the secured borrowing base not to exceed 60%, debt service coverage ratio of
1.5x for the secured borrowing base and 2.0x for Beacon Partnership as a whole,
a leverage ratio not to exceed 55%, with the ability to increase leverage to
66.67% for up to six months at a time, limitations on additional indebtedness
and stockholders distributions, and a minimum net worth requirement. At December
31, 1996, Beacon Partnership had the ability to borrow an additional $127.5
million under the Beacon Credit Facility without having to grant additional
mortgages on other owned Properties.
 
     Beacon Partnership has considered its short-term (up to 12 months)
liquidity needs and the adequacy of expected liquidity sources to meet these
needs. Beacon Partnership believes that its principal short-term liquidity needs
are to fund normal recurring expenses, debt service requirements and the minimum
distribution required to maintain Beacon's REIT qualifications under the Code.
Beacon Partnership believes that these needs will be fully funded from cash
flows provided by operating activities.
 
     Beacon Partnership expects to meet long-term (greater than 12 months)
liquidity requirements for the costs of development, property acquisitions,
scheduled debt maturities, major renovations, expansions and other non-recurring
capital improvements through long-term secured and unsecured indebtedness and
the issuance of additional Beacon Partnership Units and equity securities.
Beacon Partnership may finance the redevelopment or acquisition of additional
properties by using the Beacon Credit Facility.
 
                                       129
<PAGE>   138
 
     Rental revenues and operating expense reimbursement income from tenants,
and income from the management and design companies are Beacon Partnership's
principal sources to pay its operating expenses, debt service and recurring
capital expenditures. Beacon Partnership seeks to increase income from existing
Properties by maintaining quality standards for its Properties that promote high
occupancy rates and permit increases in rental rates while reducing tenant
turnover and controlling operating expenses. Consequently, Beacon Partnership
believes its revenues will continue to provide the necessary funds for its
operating expenses, debt service and recurring capital expenditures.
 
     During the year ended December 31, 1996, Beacon Partnership paid quarterly
distributions totaling $1.765 per Beacon Partnership Unit, and intends to
continue paying distributions quarterly. Beacon Partnership expects to use cash
flows from operating activities to fund distributions to the partners.
 
     Principal sources of funds for acquisitions are expected to include income
from operations, proceeds of offerings, amounts available under the Beacon
Credit Facility, and assumption of mortgage debt on new properties, long term
secured and unsecured indebtedness or sale of real estate. In addition to funds
from the above sources, acquisitions of properties or interests therein may also
be acquired by the issuance of Beacon Partnership Units.
 
ENVIRONMENTAL MATTERS
 
     Beacon Partnership believes, based on its internal reviews, environmental
site assessments performed by consultants, existing plans to mitigate and
monitor the sites and financial commitments of certain prior owners and tenants,
that the future costs relating to environmental remediation and compliance will
not have a material adverse effect on Beacon Partnership's financial condition,
results of operations, or liquidity.
 
INFLATION
 
     Most of Beacon Partnership's leases require tenants to pay increases in
operating expenses, including common area charges and real estate taxes, thereby
reducing the risk to Beacon Partnership of the adverse effects of inflation.
Leases also vary in term from three years to 15 years, further reducing the risk
to Beacon Partnership of the adverse effects of inflation.
 
                                       130
<PAGE>   139
 
                             THE BEACON PROPERTIES
 
     The following table sets forth certain information relating to each Beacon
Property as of September 30, 1997.
 
<TABLE>
<CAPTION>
                                                                                                          AVERAGE    AVERAGE
                                                                                   AREA IN                ANNUAL    ANNUAL NET
                                 YEAR BUILT/    OWNERSHIP    PROPERTY               SQUARE     PRESENT     BASE     EFFECTIVE
PROPERTY                          RENOVATED    INTEREST(1)   LOCATION                FEET      LEASED     RENT(2)    RENT(3)
- --------                         -----------   -----------   --------             ----------   -------    -------   ----------
<S>                              <C>           <C>           <C>                  <C>          <C>        <C>       <C>
DOWNTOWN BOSTON OFFICE MARKET:
225 Franklin Street............        1966(4)      100%     Boston, MA              929,545     100%     $36.94      $32.73
75-101 Federal Street..........   1985-1988        51.6%     Boston, MA              812,000      91%      30.19       19.62
One Post Office Square.........        1981          50%     Boston, MA              764,129      99%      25.18       15.69
Center Plaza...................   1966-1969            (5)   Boston, MA              649,359      97%      22.64       12.87
150 Federal Street.............        1988         100%     Boston, MA              530,279     100%      26.02       21.25
Rowes Wharf....................        1987          45%     Boston, MA              344,326     100%      31.35       18.91
Russia Wharf...................   1978-1982         100%     Boston, MA              314,596      98%      15.07        8.44
2 Oliver Street -- 147 Milk
  Street.......................   1982-1988         100%     Boston, MA              271,000      99%      18.62       11.94
175 Federal Street.............        1977         100%     Boston, MA              203,349      99%      25.69       15.83
South Station(6)...............        1988         100%     Boston, MA              148,591     100%      30.94       21.00
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                    4,967,174      98%     $27.59      $19.48
                                                                                  ----------    ----      ------      ------
GREATER BOSTON SUBURBAN OFFICE MARKET:
Wellesley Office Park(7).......   1963-1984         100%     Wellesley, MA           622,862      99%     $24.73      $17.36
Crosby Corporate Center(8).....        1996         100%     Bedford, MA             336,000      98%      14.02       10.02
175 Wyman Street(9)............                     100%     Waltham, MA             335,000      (9)         (9)         (9)
Westwood Business Centre.......        1985         100%     Westwood, MA            160,400      96%      19.81       11.28
New England Executive Park
  Portfolio(10)................   1970-1985         100%     Burlington, MA          817,013      93%      19.56       12.57
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                    2,271,275      96%(9)  $20.31      $13.58
                                                                                  ----------    ----      ------      ------
CAMBRIDGE OFFICE MARKET:
One Canal Park.................        1987         100%     Cambridge, MA           100,300     100%     $22.05      $13.99
Ten Canal Park.................        1987         100%     Cambridge, MA           110,000     100%      19.00       12.16
245 First Street(11)...........   1985-1986         100%     Cambridge, MA           263,227     100%      22.55       17.46
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                      473,527     100%     $21.61      $15.49
                                                                                  ----------    ----      ------      ------
CENTRAL PERIMETER ATLANTA OFFICE MARKET(12):
North Terraces.................        1984         100%     Atlanta, GA             492,845      98%     $20.37      $14.50
South Terraces.................        1986         100%     Atlanta, GA             494,513      95%      21.25       13.37
8,10,12,14,16 Perimeter Center
  East.........................        1970         100%     Atlanta, GA              64,998      89%      14.95       10.20
20,22,24,26 Perimeter Center
  East.........................        1973         100%     Atlanta, GA              69,727      95%      15.46       10.03
28,30,32 Perimeter Center
  East.........................        1974         100%     Atlanta, GA             104,816      98%      14.13        8.66
41 Perimeter Center East.......        1974         100%     Atlanta, GA              92,021      98%      15.59        9.98
47 Perimeter Center East.......        1974         100%     Atlanta, GA              92,021      97%      15.56       10.14
50 Perimeter Center East.......        1981         100%     Atlanta, GA               6,300     100%       7.66        7.66
53 Perimeter Center East.......        1972         100%     Atlanta, GA              90,505     100%      17.12       12.29
56 Perimeter Center East.......        1977         100%     Atlanta, GA              93,625     100%      16.16        8.56
64 Perimeter Center East.......        1971         100%     Atlanta, GA             183,037     100%       5.34        2.38
64A Perimeter Center East......        1985         100%     Atlanta, GA             372,498     100%      20.66       17.39
70,72,74,76 Perimeter Center
  East.........................        1972         100%     Atlanta, GA              61,932      88%      15.97       10.75
125 Perimeter Center West......        1972         100%     Atlanta, GA             223,059     100%       4.10        3.07
219 Perimeter Center Parkway...        1979         100%     Atlanta, GA             127,697     100%      15.94       11.60
223 Perimeter Center Parkway...        1978         100%     Atlanta, GA             127,823     100%      16.50       11.43
245 Perimeter Center Parkway...        1981         100%     Atlanta, GA             229,217     100%      18.05       11.36
301 Perimeter Center North.....        1982         100%     Atlanta, GA             151,416     100%      18.48       12.25
303 Perimeter Center North.....        1989         100%     Atlanta, GA             162,256     100%      20.98       14.70
</TABLE>
 
                                       131
<PAGE>   140
 
<TABLE>
<CAPTION>
                                                                                                          AVERAGE    AVERAGE
                                                                                   AREA IN                ANNUAL    ANNUAL NET
                                 YEAR BUILT/    OWNERSHIP    PROPERTY               SQUARE     PRESENT     BASE     EFFECTIVE
PROPERTY                          RENOVATED    INTEREST(1)   LOCATION                FEET      LEASED     RENT(2)    RENT(3)
- --------                         -----------   -----------   --------             ----------   -------    -------   ----------
<S>                              <C>           <C>           <C>                  <C>          <C>        <C>       <C>
Park Place Shopping Center.....        1979         100%     Atlanta, GA              61,830     100%      16.44       13.04
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                    3,302,136      98%     $17.00      $11.72
                                                                                  ----------    ----      ------      ------
ARLINGTON COUNTY, VIRGINIA OFFICE MARKET:
The Polk and Taylor
  Buildings....................        1970          10%     Arlington, VA           890,000     100%     $23.82      $19.28
1300 North Seventeenth
  Street.......................        1980         100%     Rosslyn, VA             372,865     100%      24.20       17.09
1616 North Fort Myer Drive.....        1974         100%     Rosslyn, VA             292,826     100%      23.23       15.44
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                    1,555,691     100%     $23.80      $18.03
                                                                                  ----------    ----      ------      ------
FAIRFAX COUNTY, VIRGINIA OFFICE MARKET:
John Marshall I................        1981         100%     McLean, VA              261,364     100%     $18.26      $15.85
E.J. Randolph..................        1983         100%     McLean, VA              164,677      99%      21.21       15.26
Northridge I...................        1988         100%     Reston/Herndon, VA      124,319     100%      25.96       19.34
Centerpointe I.................        1988         100%     Fairfax, VA             204,481     100%      15.23       11.94
                                                                                                                      ------
Centerpointe II................        1990         100%     Fairfax, VA             204,481      98%      18.29       13.90
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                      959,322     100%     $19.12      $14.95
                                                                                  ----------    ----      ------      ------
WASHINGTON, D.C. OFFICE MARKET:
1333 H Street..................        1982(13)      100%    Washington, D.C.        238,694      91%     $27.42      $20.18
                                                                                  ----------    ----      ------      ------
SUBURBAN CHICAGO OFFICE MARKET:
AT&T Plaza.....................        1984         100%     Oak Brook, IL           225,318     100%     $21.23      $14.26
Tri-State International(14)....        1986         100%     Lincolnshire, IL        548,000      84%      22.64       15.92
Presidents Plaza(15)...........   1980-1982         100%     Chicago, IL             791,000      95%      19.94       13.92
Westbrook Corporate
  Center(16)...................   1985-1996         100%     Westchester, IL       1,106,000      91%      24.47       19.23
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                    2,670,318      92%     $22.48      $16.56
                                                                                  ----------    ----      ------      ------
WEST LOS ANGELES OFFICE MARKET:
10960 Wilshire Boulevard.......   1971/1992         100%     Westwood, CA            543,804      89%     $21.56      $18.53
10880 Wilshire Boulevard(17)...   1970/1992         100%     Westwood, CA            541,176      85%      20.08       16.32
                                                                                  ----------    ----      ------      ------
    Subtotal/Weighted
      Average..................                                                    1,074,980      87%     $20.83      $17.44
                                                                                  ----------    ----      ------      ------
SILICON VALLEY OFFICE/R&D MARKET:
Shoreline Technology
  Park(18).....................   1985-1991         100%     Mountain View, CA       726,500     100%     $17.88(19)  $18.77(20)
Lake Marriott Business
  Park(21).....................        1981         100%     Santa Clara, CA         400,000     100%      10.29(19)   10.78(20)
Sunnyvale Business Park(22)....        1990         100%     Sunnyvale, CA           175,000     100%      18.44       18.76
    Subtotal/Weighted
      Average..................                                                    1,301,500     100%     $15.62      $16.32(20)
                                                                                  ----------    ----      ------      ------
    Total/Weighted
      Average(9)(23)...........                                                   18,623,617      97%     $22.04      $16.26
                                                                                  ----------    ----      ------      ------
</TABLE>
 
- ---------------
 (1) Beacon Partnership holds a general partner interest in the entity which
     owns the fee title in One Post Office Square; a general partner and limited
     partner interest in the entities which own the fee title in each of Center
     Plaza and the Polk and Taylor Buildings; and an indirect limited partner
     interest in Rowes Wharf Associates, the entity that owns the hotel space
     and ground leases the office and retail space at Rowes Wharf. Beacon
     Partnership holds approximately 50.8% of the common stock of BeaMetFed,
     Inc. ("BeaMetFed"), a private REIT that holds the fee title to 75-101
     Federal Street. Beacon Partnership owns a 100% fee interest in the
     remaining Beacon Properties, with the exception of South Station and 10880
     Wilshire Boulevard, in each of which Beacon Partnership holds a ground
     leasehold interest.
 
 (2) Base Rent is gross rent excluding payments by tenants on account of real
     estate tax and operating expense escalation.
 
 (3) Net Effective Rent is Base Rent adjusted on a straight-line basis for
     contractual rent step-ups and free rent periods, plus tenant payments on
     account of real estate tax and operating expense escalations, less total
     operating expenses and real estate taxes.
 
                                       132
<PAGE>   141
 
 (4) 225 Franklin Street has undergone an approximately $95 million renovation
     during the past eight years, including installation of new electrical
     systems, and a complete upgrade of mechanical systems, elevators, lobbies,
     roofs and the exterior plaza of the building.
 
 (5) Beacon Partnership holds a 1% general partner interest, a 75% limited
     partner interest and an option to purchase the remaining 24% limited
     partner interest in the partnership that owns Center Plaza.
 
 (6) Beacon Partnership owns a ground leasehold interest in South Station which
     expires in 2024 but may be extended, at Beacon Partnership's option, for
     two additional 15-year terms. The ground lessor and Beacon Partnership have
     been in discussions to attempt to resolve a dispute involving the method of
     calculation of the lease payments and representatives of the lessor have
     informally taken the position that the ground lessor is entitled to declare
     a default. Unless these discussions result in a resolution of the dispute,
     litigation could ensue, the outcome of which could be adverse to Beacon
     Partnership (or, assuming consummation of the Mergers, EOP Partnership),
     possibly resulting in a loss of this property. This Beacon Property was
     originally built in the early 1900s and was fully rehabilitated in 1988.
     This Beacon Property includes a significant retail component.
 
 (7) The Wellesley Office Park consists of eight office buildings.
 
 (8) The Crosby Corporate Center consists of six office buildings.
 
 (9) 175 Wyman Street consists of a vacant 335,000 square foot office/research
     and development complex and 26.7 acres of land suitable for development.
     Weighted Averages exclude 175 Wyman Street.
 
(10) The New England Executive Park portfolio consists of nine of the 13 office
     buildings located in the New England Executive Park, the remaining four of
     which are owner-occupied.
 
(11) 245 First Street consists of two attached structures connected by a
     four-story atrium. Riverview I, a six-story office building, was
     constructed in 1909 and renovated in 1986. Riverview II, an 18-story
     structure with parking on the first nine floors, was constructed in 1985.
 
(12) The Perimeter Center portfolio consists of 32 buildings and six parcels of
     land that Beacon Partnership has ground leased to tenants.
 
(13) Approximately 205,000 square feet of the 1333 H Street Property was built
     in 1982. The remaining approximately 34,000 square feet was renovated in
     1982.
 
(14) The Tri-State International complex consists of five office buildings.
 
(15) Presidents Plaza consists of four office buildings.
 
(16) Westbrook Corporate Center consists of five office buildings.
 
(17) Beacon Partnership owns a ground leasehold interest in 10880 Wilshire
     Boulevard which expires in 2068. Beacon Partnership has an option to
     purchase the ground under 10880 Wilshire Boulevard at fair market value in
     2001.
 
(18) Shoreline Technology Park consists of 12 office buildings.
 
(19) Shoreline Technology Park, Sunnyvale Business Center and substantially all
     of the Lake Marriott Business Park are leased pursuant to triple net
     leases.
 
(20) Net rent, as adjusted on a straight-line basis to take into effect periodic
     increases in net rent.
 
(21) Lake Marriott Business Park consists of seven office buildings.
 
(22) Sunnyvale Business Center consists of three office buildings.
 
(23) Weighted Averages exclude 175 Wyman Street.
 
                                       133
<PAGE>   142
 
LEASE EXPIRATIONS
 
     The following tables set forth lease expirations (in square feet) for the
Beacon Properties by market area.
<TABLE>
<CAPTION>
                                                 LEASE EXPIRATIONS -- ALL BEACON PROPERTIES
                                              -------------------------------------------------
                                                10/97
                                                  TO
MARKET AREA                                     12/97         1998         1999         2000
- -----------                                     -----         ----         ----         ----
<S>                           <C>             <C>          <C>          <C>          <C>
Downtown Boston.............  square feet(a)     156,342      344,866      420,298      483,139
                              % sq. ft(b)            3.1%         6.9%         8.5%         9.7%
                              annual rent(c)   3,347,669   10,670,777   11,165,773   14,065,359
                              psf(d)              $21.41       $30.94       $26.57       $29.11
                              tenants(e)              30           63           64           73
Suburban Boston(f)..........  square feet(a)     243,905      234,737      197,356      227,914
                              % sq. ft(b)           12.5%        12.1%        10.1%        11.7%
                              annual rent(c)   4,562,258    5,212,586    3,813,204    5,286,633
                              psf(d)              $18.71       $22.21       $19.32       $23.20
                              tenants(e)              21           38           30           37
Cambridge...................  square feet(a)           0        3,499        1,411        6,320
                              % sq. ft(b)            0.0%         0.7%         0.3%         1.3%
                              annual rent(b)           0      127,832       31,606       83,269
                              psf(d)               $0.00       $36.53       $22.40       $13.18
                              tenants(e)               0            1            1            1
Central Perimeter Atlanta...  square feet(a)     103,981      282,822      686,095      332,652
                              % sq. ft(b)            3.1%         8.6%        20.8%        10.1%
                              annual rent(c)   1,982,033    4,758,379   13,146,864    6,546,469
                              psf(d)              $19.06       $16.82       $19.16       $19.68
                              tenants(e)              19           47           61           45
Arlington County, VA........  square feet(c)     890,000       31,338        5,672      137,494
                              % sq. ft(b)           57.2%         2.0%         0.4%         8.8%
                              annual rent(b)  21,774,468      778,924      133,333    3,731,043
                              psf(d)              $24.47       $24.86       $23.51       $27.14
                              tenants(e)               7            6            2           10
Fairfax County, VA..........  square feet(a)       6,976       10,698       42,430      137,943
                              % sq. ft(b)            0.7%         1.1%         4.4%        14.4%
                              annual rent(c)     103,378      220,898      899,587    3,694,874
                              psf(d)              $14.82       $20.65       $21.20       $26.79
                              tenants(e)               2            2            5            2
Washington, D.C. ...........  square feet(a)       4,004        4,045        2,945        8,835
                              % sq. ft(b)            1.7%         1.7%         1.2%         3.7%
                              annual rent(c)     111,880      115,428       80,988      243,846
                              psf(d)              $27.94       $28.54       $27.50       $27.60
                              tenants(e)               1            3            1            3
 
<CAPTION>
                                 LEASE EXPIRATIONS -- ALL BEACON PROPERTIES
                              -------------------------------------------------
 
                                                                                    2005 &
MARKET AREA                      2001         2002         2003         2004        BEYOND
- -----------                      ----         ----         ----         ----        ------
<S>                           <C>          <C>          <C>          <C>          <C>
Downtown Boston.............     808,534      647,859      198,072      208,082    1,581,410
                                    16.3%        13.1%         4.0%         4.2%        31.9%
                              26,761,372   20,330,985    5,707,104    6,355,076   64,806,054
                                  $33.10       $31.38       $28.81       $30.54       $40.98
                                      54           46           13           15           31
Suburban Boston(f)..........     165,988      124,633       53,521      104,177      529,727
                                     8.5%         6.4%         2.7%         5.4%        27.2%
                               3,954,214    3,340,026    1,343,979    2,304,107   11,772,504
                                  $23.83       $26.80       $25.11       $22.12       $22.22
                                      32           23            4            5            8
Cambridge...................     315,964      116,601       28,000            0            0
                                    66.6%        24.6%         5.9%         0.0%         0.0%
                               8,165,274    2,632,857      709,712            0            0
                                  $25.84       $22.58       $25.35        $0.00        $0.00
                                       4            2            1            0            0
Central Perimeter Atlanta...     873,983      237,574       54,204      257,229      412,664
                                    26.5%         7.2%         1.6%         7.8%        12.5%
                              15,797,956    5,563,250    1,377,596    1,887,544   10,179,631
                                  $18.08       $23.42       $25.42        $7.34       $24.67
                                      45           28            5            6            7
Arlington County, VA........     163,407       84,759       90,458       22,770      131,853
                                    10.5%         5.4%         5.8%         1.5%         8.5%
                               4,215,680    1,924,479    2,368,468      666,162    3,632,976
                                  $25.80       $22.71       $26.18       $29.26       $27.55
                                       6            4            5            2            4
Fairfax County, VA..........      67,282       63,342        4,890       70,904      552,784
                                     7.0%         6.6%         0.5%         7.4%        57.7%
                               1,699,923    1,308,720       98,582    1,755,410   13,039,779
                                  $25.27       $20.66       $20.16       $24.76       $23.59
                                       7            9            1            2            5
Washington, D.C. ...........       2,945       71,006       14,708            0      108,528
                                     1.2%        29.7%         6.2%         0.0%        45.5%
                                  79,692    2,153,356      461,684            0    3,660,393
                                  $27.06       $30.33       $31.39        $0.00       $33.73
                                       1            6            1            0            2
</TABLE>
 
                                       134
<PAGE>   143
<TABLE>
<CAPTION>
                                                 LEASE EXPIRATIONS -- ALL BEACON PROPERTIES
                                              -------------------------------------------------
                                                10/97
                                                  TO
MARKET AREA                                     12/97         1998         1999         2000
- -----------                                     -----         ----         ----         ----
<S>                           <C>             <C>          <C>          <C>          <C>
Suburban Chicago............  square feet(a)      63,100      209,224      210,001      420,586
                              % sq. ft(b)            2.4%         7.8%         7.9%        15.7%
                              annual rent(c)   1,236,156    4,949,770    5,429,292   11,732,367
                              psf(d)              $19.59       $23.66       $25.85       $27.90
                              tenants(e)              18           32           32           40
West Los Angeles............  square feet(a)      27,222       10,197       33,172      201,010
                              % sq. ft(b)            2.5%         0.9%         3.1%        18.7%
                              annual rent(c)     680,880      292,711      917,803    5,526,949
                              psf(d)              $25.01       $28.71       $27.67       $27.50
                              tenants(e)               2            3            9           21
Silicon Valley..............  square feet(a)      60,548        9,465       24,548      509,320
                              % sq. ft(b)            4.7%         0.7%         1.9%        39.1%
                              annual rent(c)     938,578      133,634      241,383    7,991,481
                              psf(d)              $15.50       $14.12        $9.83       $15.69
                              tenants(e)               2            2            3            7
Total Properties(f).........  square feet(a)   1,556,078    1,140,891    1,623,928    2,465,213
                              % sq. ft(b)            8.4%         6.2%         8.8%        13.3%
                              annual rent(c)  34,737,300   27,260,937   35,859,833   58,902,291
                              psf(d)              $22.32       $23.89       $22.08       $23.89
                              tenants(e)             102          197          208          239
 
<CAPTION>
                                 LEASE EXPIRATIONS -- ALL BEACON PROPERTIES
                              -------------------------------------------------
 
                                                                                    2005 &
MARKET AREA                      2001         2002         2003         2004        BEYOND
- -----------                      ----         ----         ----         ----        ------
<S>                           <C>          <C>          <C>          <C>          <C>
 
Suburban Chicago............     273,043      358,438      219,098      175,936      527,401
                                    10.2%        13.4%         8.2%         6.6%        19.7%
                               7,022,124    9,616,157    5,721,308    4,557,637   15,565,119
                                  $25.72       $26.83       $26.11       $25.91       $29.51
                                      37           26           13            8           19
West Los Angeles............     151,557      205,555       34,801       93,707      181,793
                                    14.1%        19.1%         3.2%         8.7%        16.9%
                               4,462,547    6,381,707    1,134,632    3,041,886    6,159,909
                                  $29.44       $31.05       $32.60       $32.46       $33.88
                                      22           10            3            3            5
Silicon Valley..............     380,932            0            0            0      314,997
                                    29.3%         0.0%         0.0%         0.0%        24.2%
                               7,082,150            0            0            0    5,967,949
                                  $18.59        $0.00        $0.00        $0.00       $18.95
                                       2            0            0            0            2
Total Properties(f).........   3,203,635    1,909,767      697,752      932,805    4,341,157
                                    17.3%        10.3%         3.8%         5.0%        23.5%
                              79,242,932   53,251,537   18,923,064   20,567,823   134,784,314
                                  $24.74       $27.88       $27.12       $22.05       $31.05
                                     210          154           46           41           83
</TABLE>
 
- ---------------
 
(a) Total area in square feet covered by such leases.
 
(b) Percentage of total square feet represented by such leases.
 
(c) Annualized expiring base rental income represented by such leases in the
    year of expiration plus 1996 tenant payments on account of real estate tax
    and operating expense escalations, except leases with CPI increases in lieu
    of expense recoveries (amounts in dollars).
 
(d) Calculated as annual rent divided by square feet.
 
(e) The number of tenants whose leases will expire.
 
(f) These figures exclude 175 Wyman Street.
 
                                       135
<PAGE>   144
 
MORTGAGE INDEBTEDNESS AND CREDIT FACILITY
 
     Beacon Partnership's total outstanding consolidated mortgage debt and its
proportionate share of the total outstanding unconsolidated mortgage debt on the
Beacon Properties (excluding Rowes Wharf) was approximately $679.3 million at
September 30, 1997. Additionally, at September 30, 1997, Beacon Partnership's
outstanding balance under the Beacon Credit Facility was $249 million. The
following table sets forth certain information regarding the consolidated and
unconsolidated mortgage debt obligations of Beacon Partnership, including
mortgage obligations relating to specific Beacon Properties, and the Beacon
Credit Facility. All of the mortgage debt is nonrecourse to Beacon Partnership.
At September 30, 1997, Beacon Partnership's fixed rate debt had a weighted
average interest rate of 7.39% and a weighted average maturity of 6.5 years.
 
<TABLE>
<CAPTION>
                                                        PRINCIPAL      BEACON
                                                         AMOUNT     PARTNERSHIP'S
                                                         (AS OF      PORTION OF     INTEREST    MATURITY
PROPERTY                                                9/30/97)      PRINCIPAL       RATE      DATE(a)
- --------                                                ---------   -------------   --------    --------
                                                                  (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                     <C>         <C>             <C>         <C>
MORTGAGE INDEBTEDNESS:
BEACON CONSOLIDATED PROPERTIES
175 Federal Street....................................     12.8          12.8         8.00%      7/1/98
150 Federal Street....................................     56.6          56.6         6.67%     11/1/98
Centerpointe I & II...................................     30.0          30.0         7.32%     2/28/01
Wellesley Office Park.................................     55.0          55.0         7.23%      2/1/03
Center Plaza..........................................     60.0          60.0         7.23%      3/1/03
John Marshall I.......................................     20.3          20.3         8.63%      6/1/04
Perimeter Center......................................    218.0         218.0         7.08%     3/31/06
Northridge I..........................................     13.6          13.6         8.19%      1/1/07
E.J. Randolph.........................................     15.0          15.0         8.19%      1/1/07
Westbrook Corporate Center............................    105.7         105.7         8.00%      5/1/07
                                                         ------        ------
     Total Consolidated Properties....................   $587.0        $587.0
                                                         ------        ------
UNCONSOLIDATED BEACON PROPERTIES WITH RESPECT TO WHICH
  BEACON PARTNERSHIP IS A GENERAL PARTNER OR
  SHAREHOLDER
One Post Office Square................................   $ 67.1        $ 33.6         7.00%      8/1/00
One Post Office Square................................     24.7          12.3         8.25%      8/1/00
75-101 Federal Street.................................     90.0          46.4         7.61%     10/1/02
                                                         ------        ------
     Total Unconsolidated Properties..................    181.8          92.3
                                                         ------        ------
     Total Mortgage Debt..............................   $768.8        $679.3
                                                         ------        ------
CREDIT FACILITY.......................................   $249.0        $249.0          (b)      3/31/00
                                                         ------        ------
</TABLE>
 
- ---------------
(a) All mortgage debt is subject to principal amortization over periods of 20 to
    27 years and is prepayable prior to maturity subject to certain conditions
    and penalties.
 
(b) At Beacon Partnership's option, at either (i) the higher of (x) BankBoston,
    N.A.'s base interest rate and (y) one-half of one percent (0.5%) above the
    overnight federal funds effective rate or (ii) the Eurodollar rate plus 90
    basis points (0.90%).
 
                                       136
<PAGE>   145
 
                   MARKETS AND COMPETITION OF EOP AND BEACON
 
     EOP and Beacon (on a combined basis) operate in most of the top office
markets in the United States. Emerging Trends in Real Estate 1997, Cognetics
Real Estate, Inc. in December 1996, and 1997 Landauer Real Estate Market
Forecast have each ranked the top office markets. Of the 20 markets listed
below, EOP and Beacon own Office Properties in 16 of such markets as highlighted
in bold, capitalized text.
 
<TABLE>
<CAPTION>
                                                  LEADING MARKETS
                                                 FOR PRIMARY OFFICE            TOP 15 CITIES -- LANDAUER MOMENTUM
  MARKETS TO WATCH IN 1997               EMPLOYMENT GROWTH -- 1996 TO 2005      INDEX FOR OFFICE MARKETS -- 1997
  ------------------------               ---------------------------------     ----------------------------------
  <S>                                   <C>                                   <C>
   1. SAN FRANCISCO, CA                 1. LOS ANGELES, CA                    1. PHOENIX, AZ
   2. Seattle, WA                       2. SAN FRANCISCO/OAKLAND, CA          2. ORLANDO, FL
   3. BOSTON, MA                        3. ATLANTA, GA                        3. Minneapolis, MN
   4. CHICAGO, IL                       4. DALLAS/FORT WORTH, TX              4. ATLANTA, GA
   5. DENVER, CO                        5. WASHINGTON, DC                     5. DENVER, CO
   6. SAN DIEGO, CA                     6. CHICAGO, IL                        6. CHARLOTTE, NC
   7. ATLANTA, GA                       7. PHOENIX, AZ                        7. NASHVILLE, TN
   8. LOS ANGELES, CA                   8. NEW YORK, NY                       8. TAMPA, FL
   9. DALLAS/FORT WORTH, TX             9. HOUSTON/GALVESTON, TX              9. Kansas City, KS
  10. WASHINGTON, DC                    10. TAMPA/ST. PETERSBURG, FL          10. Miami, FL
  11. Minneapolis, MN                   11. Minneapolis, MN                   11. DALLAS, TX
  12. NEW YORK, NY                      12. BOSTON, MA                        12. Seattle, WA
  13. PHOENIX, AZ                       13. DENVER/BOULDER, CO                13. CHICAGO, IL
  14. Miami, FL                         14. Seattle, WA                       14. SAN FRANCISCO, CA
  15. HOUSTON, TX                       15. MIAMI/FT. LAUDERDALE, FL          15. BOSTON, MA
 
  Source: Emerging Trends in            Source: Cognetics Real Estate, Inc.   Source: 1997 Landauer Real
  Real Estate 1997 (Equitable                                                 Estate Market Forecast
  Real Estate Management and
  Real Estate Research
  Corporation)
</TABLE>
 
                                       137
<PAGE>   146
 
     The 25 largest markets of EOP and Beacon (on a combined basis), based on
rentable area, are set forth below.
 
<TABLE>
<CAPTION>
                                                              PERCENTAGE OF
MARKET                                                        RENTABLE AREA
- ------                                                        -------------
<S>                                                           <C>
Boston, MA..................................................      15.9%
Chicago, IL.................................................      11.7
Atlanta, GA.................................................      10.2
Washington, D.C.............................................       7.4
San Francisco, CA...........................................       5.6
Los Angeles, CA.............................................       5.4
New Orleans, LA.............................................       4.5
Dallas, TX..................................................       3.5
Fairfield County (Stamford), CT.............................       3.5
Dallas, TX..................................................       2.7
Houston, TX.................................................       2.6
San Jose, CA................................................       2.5
Orange County, CA...........................................       2.4
Cleveland, OH...............................................       2.4
Indianapolis, IN............................................       2.0
San Diego, CA...............................................       1.6
Columbus, OH................................................       1.5
Philadelphia, PA............................................       1.3
Denver, CO..................................................       1.3
Orlando, FL.................................................       1.2
Phoenix, AZ.................................................       1.2
San Antonio, TX.............................................       1.2
Charlotte, NC...............................................       1.1
New York, NY................................................       1.1
Tampa, FL...................................................        .9
                                                                  ----
     Total..................................................      94.7%
</TABLE>
 
     EOP believes that the current economic environment and lack of new office
space are allowing the office building industry to gradually re-establish
favorable supply and demand fundamentals. Continued office employment growth,
when combined with the continuing disparity between current rental rates and the
rental rates required to support new development, is expected to result in
improved trends in occupancy, rental rates and profitability.
 
                                       138
<PAGE>   147
 
           MAJOR U.S. OFFICE MARKET SPACE COMPLETIONS, ABSORPTION AND
                                 VACANCY RATES
 



             MAJOR U.S. OFFICE SPACE COMPLETIONS, ABSORPTION AND
                                VACANCY RATES

                                 [BAR GRAPH]
<TABLE>
<CAPTION>

                             Office Space                   Net Absorption
                             Completions in                 in Thousands of                             
       Year                  Thousands of Sq. Ft.           Sq. Ft.                        Vacancy Rate
- --------------------------------------------------------------------------------------------------------
<S>                          <C>                             <C>                           <C>
        1988                      110,892                      102,940                        18.2%
        1989                      108,709                       89,215                        18.3%
        1990                       88,899                       70,181                        18.6%
        1991                       50,349                       42,657                        18.8%
        1992                       32,842                       34,669                        18.6%
        1993                        5,685                       49,357                        16.9%
        1994                        4,140                       49,356                        15.2%
        1995                        6,481                       42,414                        13.9%
        1996                       12,975                       60,405                        12.2%
2nd Qtr 1997                        8,791                       35,348                        11.3%

</TABLE>




- ---------------
Source:  CB Commercial Real Estate Group, Inc./Torto Wheaton Research.
 
                                       139
<PAGE>   148
 
     In the 25 largest office markets of EOP and Beacon (on a combined basis),
rental rates have begun to trend upwards as vacancies have decreased, and EOP
believes that trends prevailing in these markets, taken as a whole, are
characteristic of the trends prevailing in all of the markets in which the
Office Properties are situated, taken as a whole. Commercial office buildings in
many markets are experiencing increasing demand for office space accompanied by
a shift in bargaining power in favor of landlords and positive trends in rental
rates and vacancies.
 
           EOP'S AND BEACON'S 25 LARGEST MARKETS-VACANCY RATE AND TW
                                 RENT INDEX(1)
 
                                  [BAR GRAPH]

<TABLE>
<CAPTION>
   Year           Vacancy Rate          TW Rent Index     
- ----------------------------------------------------------
<S>                  <C>                   <C>   
          1988       17.7%                 $17.12
          1989       17.6%                 $16.93
          1990       18.7%                 $17.08
          1991       19.0%                 $16.54
          1992       18.5%                 $15.55
          1993       16.9%                 $15.26
          1994       15.5%                 $15.74
          1995       14.0%                 $16.59
          1996       12.3%                 $17.67
Projected 1997       11.0%                 $19.73
</TABLE>

- ---------------
Source:  CB Commercial Real Estate Group, Inc./Torto Wheaton Research.
 
(1) Torto Wheaton Research defines the Torto Wheaton (TW) Rent Index as a
    "statistically computed dollar value for a five year, 10,000 [square] foot
    lease for an existing average building in the statistical average of the
    metro or submarket area." The TW Rent Index and vacancy rate in the chart
    above represent the weighted average of the TW Rent Index for the 25 largest
    markets of EOP and Beacon excluding New Orleans and San Antonio which are
    not covered by Torto Wheaton Research.
 
                                       140
<PAGE>   149
 
     Since the early 1990s, the real estate office market has been characterized
by declining new construction completions and continued moderate demand from
tenants. These dynamics have brought about improved rental rates, occupancies
and values. Since the early 1990s, when vacancy for all office space in the 25
largest office markets of EOP and Beacon peaked at approximately 20%, it has
steadily declined. For these 25 markets, the overall vacancy rate for all office
space is currently approximately 11.5%, and the vacancy rate as of June 30, 1997
for Class A office buildings is 9.0%. EOP believes that over the long term the
demand and rental rates for well located, institutional quality office space
will continue to increase and will remain competitive with new construction.
 
          EOP'S AND BEACON'S 25 LARGEST MARKETS -- NET ABSORPTION (1),
                         COMPLETIONS AND VACANCY RATES
 
                                 [BAR GRAPH]





<TABLE>
<CAPTION>
   Year         Net Absorption        Completions           Vacancy Rate
- ------------------------------------------------------------------------
<S>             <C>                   <C>                   <C>
        1988         62,566              65,172                 18.0%
        1989         57,682              68,868                 18.0%
        1990         41,719              59,239                 18.6%
        1991         26,645              33,221                 18.8%
        1992         21,049              18,290                 18.5%
        1993         31,256               3,273                 17.0%
        1994         32,151               1,276                 15.5%
        1995         29,031               3,491                 14.1%
        1996         40,490               5,948                 12.4%
2nd Qtr 1997         23,349               5,711                 11.5%
</TABLE>
- ---------------
 
Source:  CB Commercial Real Estate Group, Inc./Torto Wheaton Research and in the
case of New Orleans, Jamison Research, Inc., and in the case of San Antonio,
Baxter Southwest Corporate Realty Services.
 
(1) CB Commercial Real Estate Group, Inc./Torto Wheaton Research defines net
    absorption as the net change in multitenant occupied stock, in square feet,
    during that period.
 
                                       141
<PAGE>   150
 
                  FOR THE 25 LARGEST MARKETS OF EOP AND BEACON
                     VACANCY RATES OF CLASS A OFFICE SPACE
       COMPARED TO VACANCY RATES FOR ALL OFFICE SPACE AS OF JUNE 30, 1997
 
<TABLE>
<CAPTION>
                                                               VACANCY RATE FOR      VACANCY RATE FOR
MARKET                                                       CLASS A OFFICE SPACE    ALL OFFICE SPACE
- ------                                                       --------------------    ----------------
<S>                                                          <C>                     <C>
Los Angeles, CA............................................          15.3%                 17.8%
New Orleans, LA............................................          12.1                  19.4
Indianapolis, IN...........................................          11.3                  13.2
Philadelphia, PA...........................................          10.7                  11.9
New York, NY...............................................          10.4                  11.4
Dallas, TX.................................................          10.1                  15.3
Columbus, OH...............................................          10.0                   8.7
Fairfield County (Stanford) CT.............................           9.2                  13.1
Chicago, IL................................................           8.4                  13.2
Cleveland, OH..............................................           8.2                  13.2
Houston, TX................................................           8.0                  16.3
Atlanta, GA................................................           7.9                   9.8
San Diego, CA..............................................           7.9                  11.5
Washington, DC.............................................           7.9                   7.7
Austin, TX.................................................           7.2                   8.3
Denver, CO.................................................           7.0                   8.9
Tampa, FL..................................................           6.4                  10.1
San Antonio, TX............................................           6.3                  11.2
Orange County, CA..........................................           6.2                  10.6
Phoenix, AZ................................................           5.6                   9.2
Orlando, FL................................................           5.3                   6.2
Boston, MA.................................................           5.1                   6.6
San Francisco, CA..........................................           4.9                   5.5
Charlotte, NC..............................................           4.5                   7.0
San Jose, CA...............................................           2.4                   2.3
                                                                    -----                 -----
          All 25 markets...................................           9.0%                 11.5%
</TABLE>
 
- ---------------
Source:CB Commercial Real Estate Group, Inc./Torto Wheaton Research and in the
       case of New Orleans, Jamison Research, Inc. and in the case of San
       Antonio, Baxton Southwest Corporate Realty Services.
 
     EOP believes that office markets across the country are in a recovery.
Given prospects for limited new development and continued growth in office
demand, EOP believes that the office market recovery will continue for the
foreseeable future and will lead to increased rental rates and reduced
concessions in most office markets across the country. Based upon information
published by CB Commercial Real Estate Group, Inc./Torto Wheaton Research, it is
estimated that finance, insurance and real estate and office-based employment
account for approximately 70% of the total U.S. primary office employment.
Additionally, employment projections for the years 1996 through 2000 anticipate
continued growth in U.S. employment with office-based employment growing at
approximately 2.2% compared to total U.S. employment growth of approximately
1.4% per annum.
 
                                       142
<PAGE>   151
 
                                   MANAGEMENT
 
TRUSTEES AND EXECUTIVE AND SENIOR OFFICERS OF EOP
 
     The EOP Board currently consists of nine trustees, two-thirds of whom are
not employees or affiliates of EOP or the Equity Group. The EOP Board is divided
into three classes of trustees. The initial terms of the first, second and third
classes will expire in 1998, 1999 and 2000, respectively. Beginning in 1998,
trustees of each class will be chosen for three-year terms upon the expiration
of their current terms and each year one class of trustees will be elected by
the shareholders. EOP believes that classification of the EOP Board will help to
assure the continuity and stability of EOP's business strategies and policies as
determined by the EOP Board. Holders of EOP Common Shares will have no right to
cumulative voting in the election of trustees. Consequently, at each annual
meeting of shareholders, the holders of a majority of the EOP Common Shares will
be able to elect all of the successors of the class of trustees whose terms
expire at that meeting.
 
     Information concerning the trustees, the proposed trustees and executive
and senior officers of EOP is set forth below.
 
<TABLE>
<CAPTION>
NAME                                        AGE                         OFFICES HELD
- ----                                        ---                         ------------
<S>                                         <C>   <C>
Samuel Zell...............................  56    Chairman of the Board, Trustee
Timothy H. Callahan.......................  47    President, Chief Executive Officer, Trustee
Gary A. Beller............................  51    Executive Vice President -- Parking Facilities
Richard D. Kincaid........................  36    Executive Vice President, Chief Financial Officer
Michael A. Steele.........................  51    Executive Vice President -- Real Estate Operations
Stanley M. Stevens........................  48    Executive Vice President, Chief Legal Counsel and
                                                  Secretary
David H. Crawford.........................  41    Senior Vice President -- Administration and General
                                                  Counsel for Property Operations
Sybil J. Ellis............................  44    Senior Vice President -- Acquisitions
Frank Frankini............................  42    Senior Vice President -- Design & Construction
Jeffrey L. Johnson........................  38    Senior Vice President -- Investments
Peter D. Johnston.........................  40    Senior Vice President -- National Accounts
Frances P. Lewis..........................  44    Senior Vice President -- Corporate Communications
Diane M. Morefield........................  39    Senior Vice President -- Finance/Capital Markets
David H. Naus.............................  42    Senior Vice President -- Acquisitions
Michael E. Sheinkop.......................  36    Senior Vice President -- Portfolio Management
Sheli Z. Rosenberg........................  55    Trustee
Thomas E. Dobrowski.......................  54    Trustee
James D. Harper, Jr.......................  63    Trustee
Peter Linneman............................  46    Trustee
Jerry M. Reinsdorf........................  61    Trustee
William M. Goodyear.......................  49    Trustee
David K. McKown...........................  59    Trustee
Alan M. Leventhal(1)......................  45    Proposed Trustee
</TABLE>
 
Edwin N. Sidman(1)........................  54    Proposed Trustee
 
     Samuel Zell has been a Trustee and Chairman of the Board of EOP since
October, 1996. For more than five years, Mr. Zell has served as Chairman of the
Board of Directors of Equity Group Investments, Inc.
 
- ---------------
(1) Following the Effective Time, the trustees of EOP who were trustees
    immediately prior thereto will continue to serve for the balance of their
    unexpired terms. In addition, Alan M. Leventhal, President, Chief Executive
    Officer and a Director of Beacon, and Edwin N. Sidman, Chairman of the Board
    of Directors of Beacon, will become trustees of EOP with terms expiring at
    the first annual meeting of the shareholders of EOP with respect to which
    notice is mailed subsequent to the effective time of the Merger. EOP has
    agreed that Messrs. Leventhal and Sidman will thereafter be renominated as
    trustees for terms expiring at the annual meetings of shareholders in 2002
    and 2001, respectively. In addition, in the event that Mr. Zell ceases to be
    Chairman of the EOP Board prior to the Effective Time, the EOP Board will
    designate Mr. Leventhal as Chairman of the EOP Board for a term consisting
    of at least twelve consecutive months (subject to Mr. Leventhal remaining a
    trustee during such twelve-month period).
 
                                       143
<PAGE>   152
 
("EGI"), an owner, manager and financier of real estate and corporations. For
more than five years, Mr. Zell has served as Chairman of the Board of Directors
of Anixter International, Inc., a provider of integrated network and cabling
solutions ("Anixter"), American Classic Voyages Co., an owner and operator of
cruise lines "ACV"), Manufactured Home Communities, Inc. ("MHC"), a real estate
investment trust specializing in the ownership and management of manufactured
home communities, and as Chairman of the Board of Directors and Chief Executive
Officer of Capsure Holdings Corp., a holding company whose principal
subsidiaries are specialty property and casualty insurers ("Capsure"). Since
February 1993, Mr. Zell has served as a director of Sealy Corporation, a maker
of bedding and related products ("Sealy"). Since March 1993, Mr. Zell has served
as Chairman of the Board of Trustees of Equity Residential Properties Trust
("EQR"), an owner and operator of multifamily residential properties. Since
January 1995, Mr. Zell has served as a director of TeleTech Holdings, Inc., a
provider of telephone and computer based customer care solutions. Since March
1995, Mr. Zell has served as a director of Quality Food Centers, Inc., an
independent supermarket chain ("QFC"). Since April 1996, Mr. Zell has served as
a director of Ramco Energy plc, an independent oil company based in the United
Kingdom. Since March 1997, Mr. Zell has served as a director of Chart House
Enterprises, Inc., an owner and operator of restaurants. Since April 1997, Mr.
Zell has served as the Chairman of the Board of Directors of Jacor
Communications, Inc., an owner of radio stations ("Jacor").
 
     Timothy H. Callahan has been a Trustee and Chief Executive Officer and
President of EOP since October 1996. Mr. Callahan has served on the Board of
Managers and has been the Chief Executive Officer of EOH, and Equity Office
Properties, L.L.C., a property manager of office buildings ("EOP LLC"), from
August 1996 until October 1997. Mr. Callahan was Executive Vice President and
Chief Financial Officer of EGI from January 1995 until August 1996, was
Executive Vice President of EGI from November 1994, through January 1995 and was
Senior Vice President of EGI from July 1992, until November 1994. Mr. Callahan
was Vice President -- Finance of the Edward J. DeBartolo Corporation, a
developer, owner and operator of shopping centers, in Youngstown, Ohio from July
1988 until July 1992. Mr. Callahan was employed by Chemical Bank, a commercial
bank located in New York City, from July 1973 until March 1987.
 
     Gary A. Beller has been Executive Vice President of EOP since March 1997.
Mr. Beller has been President of Equity Capital Holdings L.L.C., the general
partner of Equity Capital Holdings, L.P., an asset manager of parking
facilities, since August 1997. Mr. Beller has been President of Equity Hotel
Properties, Inc., a subsidiary of EGI which manages hotels, since November 1993.
Mr. Beller was Senior Vice President -- Redevelopment of Equity Assets
Management, Inc., a former subsidiary of EGI which provided real estate asset
management services ("EAM") from October 1987 until March 1997.
 
     Richard D. Kincaid has been Executive Vice President and Chief Financial
Officer of EOP since March 1997 and was Senior Vice President and Chief
Financial Officer of EOP from October 1996 until March 1997. Mr. Kincaid was
Senior Vice President and Chief Financial Officer of EOH from July 1995 until
October 1997. Mr. Kincaid was Senior Vice President of EGI from February 1995
until July 1995. Mr. Kincaid was Senior Vice President of the Yarmouth Group, a
real estate investment company in New York, New York, from August 1994 until
February 1995. Mr. Kincaid was Senior Vice President-Finance for EGI from
December 1993 until July 1994. Mr. Kincaid was Vice President -- Finance for EGI
from August 1990 until December 1993. Mr. Kincaid was Vice President for
Barclays Bank PLC, a commercial bank located in Chicago, Illinois from August
1987 until August 1990.
 
     Michael A. Steele has been Executive Vice President-Real Estate Operations
for EOP since October 1996. Mr. Steele has been President and Chief Operating
Officer of EOP LLC from July 1995 until October 1997. Mr. Steele was Executive
Vice President of EOH from July 1995 until October 1997. Mr. Steele was
President and Chief Operating Officer of Equity Office Properties, Inc., a
subsidiary of EGI which provided real estate property management services ("EOP
Inc."), from November 1993 through October 1995. Mr. Steele was President and
Chief Executive Officer of First Office Management, a former division of Equity
Property Management, Inc. that provided real estate property management services
("FOM"), from June 1992 until October 1993. Mr. Steele was Senior Vice President
and regional director for Rubloff, Inc., a full service real estate company in
Chicago, Illinois, from April 1987 until June 1992.
 
                                       144
<PAGE>   153
 
     Stanley M. Stevens has been Executive Vice President, Chief Legal Counsel
and Secretary of EOP since October 1996. Mr. Stevens was Executive Vice
President and General Counsel of EOH from September 1996 until October 1997. Mr.
Stevens was a vice president of Rosenberg & Liebentritt, P.C., a law firm in
Chicago, Illinois, from December 1993 until September 1996. Mr. Stevens was a
partner at Rudnick & Wolfe, a national law firm based in Chicago, Illinois, from
October 1987 until December 1993.
 
     David H. Crawford has been Senior Vice President -- Administration, General
Counsel for Property Operations and Assistant Secretary of EOP since March 1997.
Mr. Crawford was Senior Vice President and Associate General Counsel of EOH from
September 1996 until October 1997. Mr. Crawford was Senior Vice President and
General Counsel of EOH from July 1995 until September 1996 and of EOP from
September 1996 until October 1997. Mr. Crawford was Of Counsel to Rosenberg &
Liebentritt, P.C. from February 1991 until December 1996. Mr. Crawford was
Senior Vice President and General Counsel of EOP Inc. from November 1993 until
July 1995. Mr. Crawford was Vice President and General Counsel of FOM from
February 1991 until November 1993. Mr. Crawford was an associate at Kirkland &
Ellis, a national law firm based in Chicago, Illinois, from June 1988 until
February 1991.
 
     Sybil J. Ellis has been Senior Vice President -- Acquisitions of EOP since
March 1997. Ms. Ellis was Senior Vice President -- Acquisitions of EOH from July
1995 until October 1997. Ms. Ellis was Senior Vice President -- Acquisitions of
EOP Inc. from July 1994 through July 1995 and was Vice President -- Acquisitions
of EOP, Inc. from November 1993 until July 1994. Ms. Ellis was Vice
President -- Acquisitions of EAM from March 1990 until October 1993.
 
     Frank Frankini has been Senior Vice President -- Design and Construction of
EOP since March 1997. Mr. Frankini was Senior Vice President -- Design and
Construction of EOP LLC from July 1995 until October 1997. Mr. Frankini was
Senior Vice President -- Engineering and Operations of EOP Inc. from November
1993 until July 1995. Mr. Frankini was Senior Vice President -- Engineering and
Operations of FOM from October 1990 until October 1993. Mr. Frankini was
National Director of Engineering and Operations for Rubloff, Inc., a full
service real estate company in Chicago, Illinois from October 1984 until October
1990.
 
     Jeffrey L. Johnson has been Senior Vice President -- Investments for EOP
since March 1997. Mr. Johnson was Senior Vice President -- Asset Management for
EOH from July 1996 until October 1997. Mr. Johnson was Senior Vice
President -- Acquisitions for EOH from July 1995 until July 1996. Mr. Johnson
was Senior Vice President -- Acquisitions of EOP Inc. from December 1994 until
July 1995 and was Vice President -- Acquisitions of EOP, Inc. from November 1993
until December 1994. Mr. Johnson was Vice President -- Acquisitions of EAM from
September 1990 until October 1993. Mr. Johnson was an Investor and Asset Manager
for Aldrich Eastman Waltch, Inc., a real estate advisor in Boston,
Massachusetts, from August 1987 until August 1990. Mr. Johnson was Senior
Project Manager in the real estate investment group for First Wachovia, Inc., a
commercial bank in Winston-Salem, North Carolina, from July 1983 until August
1987.
 
     Peter D. Johnston has been Senior Vice President -- National Accounts of
EOP since March 1997. Mr. Johnston was Senior Vice President -- National Leasing
Director of EOP LLC from July 1995 until October 1997. Mr. Johnston was Senior
Vice President -- Marketing and Leasing of EOP Inc. from November 1993 until
July 1995. Mr. Johnston was Senior Vice President -- Marketing and Leasing of
FOM from April 1993 until November 1993. Mr. Johnston was a Vice President of
EAM from October 1991 until April 1993. Mr. Johnston was a partner with Trammell
Crow Company, a full service real estate company, in Cincinnati, Ohio from
January 1991 until July 1991. Mr. Johnston was a partner with Trammell Crow
Company in Columbus, Ohio from January 1990 until December 1990.
 
     Frances P. Lewis has been Senior Vice President -- Corporate Communications
for EOP since April 1997. Ms. Lewis was Vice President -- Corporate
Communications of EGI from November 1994 until April 1997. Ms. Lewis was Vice
President -- Publications of EGI from September 1988 until October 1994.
 
     Diane M. Morefield has been Senior Vice President -- Finance/Capital
Markets since July 1997. Ms. Morefield was Senior Manager in the Corporate
Finance practice of Deloitte & Touche, a public
 
                                       145
<PAGE>   154
 
accounting and consulting firm, from November 1994 until July 1997. Ms.
Morefield was Executive Vice President of the Fordham Company, a real estate
development company located in Chicago, Illinois, from November 1993 until
November 1994. Ms. Morefield was Team Leader for the Real Estate Group division,
in the Midwest, of Barclays Bank PLC, a commercial bank located in Chicago,
Illinois, from 1982 until November 1993.
 
     David H. Naus has been Senior Vice President -- Acquisitions of EOP since
March 1997. Mr. Naus was Senior Vice President -- Acquisitions for EOH from
December 1995 until October 1997. Mr. Naus was Vice President -- Acquisitions of
EOH from July 1995 until December 1995. Mr. Naus was Vice President --
Acquisitions of EOP Inc. from November 1993 until July 1995. Mr. Naus was Vice
President -- Acquisitions of EAM from November 1992 until November 1993. Mr.
Naus was Vice President of EAM from October 1988 until November 1992.
 
     Michael E. Sheinkop has been Senior Vice President -- Portfolio Management
for EOP since March 1997. Mr. Sheinkop was Senior Vice President -- Divisional
Manager of EOH from March 1997 until October 1997. Mr. Sheinkop was Senior Vice
President -- Asset Management of EOH from December 1995 until February 1997. Mr.
Sheinkop was Vice President -- Asset Management of EOH from July 1995 until
December 1995. Mr. Sheinkop was a Vice President -- Asset Management of EOP Inc.
from November 1993 until July 1995. Mr. Sheinkop was Vice President of EAM from
March 1990 until November 1993.
 
     Sheli Z. Rosenberg has been a trustee of EOP since March 1997. Since
November 1994, Ms. Rosenberg has been Chief Executive Officer and President of
EGI. From 1980 until September 1997, Ms. Rosenberg was a principal of the law
firm of, and is currently of counsel to, Rosenberg & Liebentritt, P.C. For more
than five years, Ms. Rosenberg has served on the Board of Directors of each of
the following companies: EGI, AVC, Anixter, and Capsure. Since March 1993, Ms.
Rosenberg has been a trustee of EQR. Since 1994, Ms. Rosenberg has been a
director of Jacor and since April 1997, has served as the Vice Chairman of the
Board of Directors of Jacor. Ms. Rosenberg was a vice president of First Capital
Benefit Administrators, Inc., a wholly owned indirect subsidiary of Great
American Management and Investment, Inc., ("FCBA") which filed a Chapter 7
Bankruptcy petition on January 3, 1995, resulting in FCBA's liquidation. On
November 15, 1995, an order closing the FCBA bankruptcy case was entered by the
Bankruptcy Court for the Central District of California. Since December 1995,
Ms. Rosenberg has been a director of Sealy. Since March 1996, Ms. Rosenberg has
been a director of QFC. Since August 1986, Ms. Rosenberg has been director of
MHC. Since April 1997, Ms. Rosenberg has been a director of Illinois Power Co.,
a supplier of electricity and natural gas in Illinois, the holding company of
which is Illinova Corp., of which Ms. Rosenberg is also a director. Since May
1997, Ms. Rosenberg has been a director of CVS Corporation, a drugstore chain.
 
     Thomas E. Dobrowski has been a trustee of EOP since July 1997. Since
December, 1994, Mr. Dobrowski has been the managing director of real estate and
alternative investments of General Motors Investment Management Corporation
("GMIMCO"), an investment advisor to several pension funds of General Motors
Corporation ("GM") and its subsidiaries and to several other clients also
controlled by GM. Since March 1993, Mr. Dobrowski has been a director of MHC.
Since April 1994, Mr. Dobrowski has been a director of Red Roofs Inns, Inc., an
owner and operator of hotels. Since May 1997, Mr. Dobrowski has been a director
of Taubman Centers Inc., an equity REIT focused on regional shopping centers.
 
     James D. Harper, Jr. has been a trustee of EOP since July 1997. Since 1982,
Mr. Harper has been president of JDH Realty Co., a real estate development and
investment company. Since 1988, he has been a co-managing partner in AH
Development, S.E. and AH HA Investments, S.E., special limited partnerships
formed to develop over 400 acres of land in Puerto Rico. Since May 1993, Mr.
Harper has been a trustee of EQR. Since 1993, Mr. Harper has been a trustee of
Urban Land Institute. Since 1997, Mr. Harper has been a director of Burnham
Pacific Properties Inc., a REIT that owns, develops and manages commercial real
estate properties in California. Since June 1997, Mr. Harper has been a director
of American Health Properties, Inc., a REIT specializing in health care
facilities.
 
     Peter Linneman has been a trustee of EOP since July 1997. Dr. Linneman has
been a Professor of Finance and Public Policy at the Wharton School of the
University of Pennsylvania since 1979, the Albert Sussman Professor of Real
Estate at the Wharton School since 1989 and a director of the Wharton Real
 
                                       146
<PAGE>   155
 
Estate Center since 1986. In addition, he is an Urban Land Institute Research
Fellow and a member of the National Association of Real Estate Investment
Trusts. Since 1986, Dr. Linneman has been a trustee of Universal Health Realty
Trust, a REIT that invests in health care and human service related facilities.
Since 1992, Dr. Linneman has been a trustee of Kranzco Realty Trust, a REIT that
owns, develops, operates, leases, manages, and invests in neighborhood and
community shopping centers and free-standing properties. Since 1993, Dr.
Linneman has been a trustee of Gables Residential Properties Trust, a
self-administered, self-managed residential property REIT. Since 1996, Dr.
Linneman has served as a director of Nevada Investment Holdings, a full service
real estate company which focuses on community shopping centers. From 1993 until
1996, Dr. Linneman was Chairman of the Board of Directors of Rockefeller Center
Properties, Inc., a REIT which previously held the first mortgage loan relating
to Rockefeller Center in New York City.
 
     Jerry M. Reinsdorf has been a trustee of EOP since July 1997. For more than
five years, Mr. Reinsdorf has been the Chairman of the Chicago White Sox
baseball team, the Chairman of the Chicago Bulls basketball team, and a partner
of Bojer Financial Ltd., a real estate investment company located in Northbrook,
Illinois. Since 1996, Mr. Reinsdorf has served as a director of LaSalle National
Bank, N.A., a commercial bank in Chicago, Illinois, the holding company of which
is LaSalle National Corporation, of which Mr. Reinsdorf is also a director.
Since 1993, Mr. Reinsdorf has been a trustee of Northwestern University in
Evanston, Illinois.
 
     William M. Goodyear has been a trustee of EOP since July 1997. Since July
1997, Mr. Goodyear has been Chairman of Bank of America, Illinois, the midwest
business development unit of BankAmerica Corporation, a commercial bank. Mr.
Goodyear was Chairman and Chief Executive Officer of Bank of America Illinois, a
subsidiary of BankAmerica Corporation, from September 1994 until June 1997, at
which time it merged with Bank of America NT & SA, a subsidiary of BankAmerica
Corporation. For more than two years prior to September 1994, Mr. Goodyear was a
Vice Chairman and a member of the Board of Directors of Continental Bank
Corporation, the parent company of Continental Bank, N.A., a commercial bank
which merged into Bank of America Illinois in September 1994. Since June 1992,
Mr. Goodyear has been a member of the Board of Trustees of the Museum of Science
and Industry in Chicago, Illinois. Mr. Goodyear has been a member of the Board
of Trustees of the University of Notre Dame since May 1996 and of
Rush-Presbyterian St. Lukes Medical Center in Chicago, Illinois since June 1996.
Mr. Goodyear has been a member of the Advisory Council for the University of
Chicago Graduate School of Business since September 1995.
 
     David K. McKown has been a trustee of EOP since July 1997. Since 1993, Mr.
McKown has been Group Executive of the Diversified Finance and Real Estate
Operating Partnership Unit of BankBoston, N.A., a commercial Bank. Mr. McKown
was director of Loan Review for BankBoston, N.A. from 1990 until 1993. Mr.
McKown serves as a Director of Electrolux Corporation.
 
     Alan M. Leventhal will be appointed as a trustee of EOP upon consummation
of the Mergers. Mr. Leventhal has served as President, Chief Executive Officer
and a Director of Beacon since 1994. Mr. Leventhal joined Beacon in 1976 after
receiving a degree in economics from Northwestern University in 1974 and a
Master of Business Administration from the Amos Tuck School of Business
Administration at Dartmouth College in 1976. Mr. Leventhal is a trustee of the
Beth Israel Corporation, trustee of Boston University, trustee of the New
England Aquarium Corporation and a member of the Visiting Committee of the
College of Arts and Sciences at Northwestern University. He is also a member of
the Board of Overseers of WGBH and the Museum of Science. Mr. Leventhal is the
brother-in-law of Edwin N. Sidman.
 
     Edwin N. Sidman will be appointed as a trustee of EOP upon consummation of
the Mergers. Mr. Sidman has served as the Chairman of the Board and a director
of Beacon since 1994. He is currently the Managing Partner of The Beacon
Companies. Prior to joining Beacon in 1971, Mr. Sidman practiced law with the
predecessor to the firm of Rubin and Rudman in Boston. Mr. Sidman graduated from
the University of Michigan and holds a law degree from Harvard University. Mr.
Sidman's professional affiliations include service as Senior Vice Chairman of
the National Realty Committee. Mr. Sidman's civic commitment includes being a
past Chairman of the Combined Jewish Philanthropies of Greater Boston, a member
of the Board of Trustees of Duke University, a member of the Board of Directors
and Executive Committee for the United
 
                                       147
<PAGE>   156
 
Way of Massachusetts Bay, a member of the Executive Committee of the Artery
Business Committee and a member of the Board of The Friends of Post Office
Square. Mr. Sidman is the brother-in-law of Alan M. Leventhal.
 
COMMITTEES OF THE EOP BOARD
 
     Audit Committee.  The Audit Committee makes recommendations concerning the
engagement of independent public accountants, reviews with the independent
public accountants the plans and results of the audit engagement, approves
professional services provided by the independent public accountants, reviews
the independence of the independent public accountants, considers the range of
audit and non-audit fees and reviews the adequacy of EOP's internal accounting
controls. The members of the Audit Committee, Messrs. Dobrowski, Goodyear and
Reinsdorf, will continue to serve on the Audit Committee after the Mergers.
 
     Executive Committee.  The Executive Committee has the authority within
certain parameters to acquire, dispose of and finance investments for EOP
(including the issuance by EOP Partnership of additional EOP Partnership Units
or other equity interests) and approve the execution of contracts and
agreements, including those related to the borrowing of money by EOP, and
generally exercise all other powers of the EOP Board except as prohibited by
law. The members of the Executive Committee, Messrs. Zell, Callahan and
Linneman, will continue to serve on the Executive Committee after the Mergers.
 
     Compensation Committee.  The Compensation Committee determines compensation
for EOP's executive officers. The Compensation Committee reviews and makes
recommendations concerning proposals by management with respect to compensation,
bonus, employment agreements and other benefits and policies respecting such
matters for the executive officers of EOP. The members of the Compensation
Committee, Ms. Rosenberg, and Messrs. Harper and McKown, will continue to serve
on the Compensation Committee after the Mergers.
 
     The EOP Board does not have a nominating committee and the entire EOP Board
will perform the function of such a committee.
 
COMPENSATION OF THE EOP BOARD; PAYMENT IN EOP COMMON SHARES
 
     EOP pays its non-employee trustees an annual fee of $40,000. In addition,
non-employee trustees who serve on the Audit Committee, Executive Committee or
Compensation Committee receive an additional $1,000 per annum for each committee
on which they serve. Committee chairs receive an additional $500 per annum.
These fees have been and generally are expected to be paid in EOP Common Shares
payable immediately or, at the option of the trustee, paid in EOP Partnership
Units on a deferred basis. Trustees who are employees of EOP are not paid any
trustees' or committee fees. EOP reimburses its trustees for travel expenses
incurred in connection with their activities on behalf of EOP. After EOP's IPO,
each trustee (other than Messrs. Zell and Callahan and Ms. Rosenberg) received a
grant of options to purchase 10,000 EOP Common Shares at the IPO price. Under
EOP's 1997 Share Option and Share Award Plan (the "Employee Plan"), each trustee
then in office (including Messrs. Zell and Callahan and Ms. Rosenberg for the
years after 1997) will receive an annual grant of options to purchase 10,000 EOP
Common Shares at the then current market price on the date of the meeting of the
EOP Board held immediately after the annual meeting of the EOP Shareholders.
These grants of options to purchase 10,000 EOP Common Shares will vest as
follows: options for 3,333 EOP Common Shares will vest six months after the
grant date, options for an additional 3,333 EOP Common Shares will vest on the
first anniversary of the grant date, and options for the remaining 3,334 EOP
Common Shares will vest on the second anniversary of the grant date. Trustees
who perform other functions for EOP may receive additional options under the
Employee Plan.
 
                                       148
<PAGE>   157
 
EXECUTIVE COMPENSATION
 
     The following table sets forth the annual base salary levels and options
and restricted share awards granted in 1997 to EOP's Chief Executive Officer and
EOP's four other most highly paid executive officers (the "Named Executive
Officers"). Information for 1996 is not presented because EOP had no operations
during such period and the Named Executive Officers were employed by other
affiliated entities, as well as by the EOP Predecessors.
 
<TABLE>
<CAPTION>
                                                                                                     RESTRICTED
                                                                       1997 BASE        OPTIONS        SHARE
NAME                                         TITLE                     SALARY(1)      ALLOCATED(2)   AWARDS(3)
- ----                                         -----                   --------------   ------------   ----------
<S>                         <C>                                      <C>              <C>            <C>
Timothy H. Callahan.......  President and Chief Executive Officer       $600,000        200,000        85,000
Gary A. Beller............  Executive Vice President -- Parking          300,000        100,000           -0-
                            Facilities
Richard D. Kincaid........  Executive Vice President, Chief              235,000        150,000        17,000
                            Financial Officer
Michael A. Steele.........  Executive Vice President -- Real Estate      265,000        150,000        17,000
                            Operations
Stanley M. Stevens........  Executive Vice President, Chief Legal        325,000        150,000           -0-
                            Counsel
</TABLE>
 
- ---------------
(1) Does not include bonuses that may be paid to the above individuals. See
    " -- Incentive Compensation" below.
 
(2) At the time of the IPO, options to purchase EOP Common Shares equal to
    approximately 2.56% of EOP's outstanding EOP Common Shares (calculated on a
    fully diluted basis) were granted to officers, employees and consultants of
    EOP under the EOP Employee Plan at a price equal to the IPO price. Such
    grants included grants to Mr. Zell and Ms. Rosenberg of options to purchase
    200,000 and 50,000 EOP Common Shares, respectively, at the IPO price which
    will vest in three equal annual installments (rounded to the nearest whole
    EOP Common Share) over three years. See " -- Option and Restricted Share
    Plan" below.
 
(3) On September 22, 1997, the Compensation Committee of EOP's Board granted
    restricted shares to certain of EOP's executive officers pursuant to its
    Employee Plan. Mr. Callahan was granted an award of 85,000 EOP Common
    Shares, and Messrs. Steele and Kincaid were each granted an award of 17,000
    EOP Common Shares. These awards will vest over a five year period after
    being granted (50% after year three, 25% after year four, and 25% after year
    five).
 
                       OPTION GRANTS IN FISCAL YEAR 1997
 
<TABLE>
<CAPTION>
                                                                                      POTENTIAL REALIZABLE
                                                                                        VALUE AT ASSUMED
                                            PERCENT OF                                   ANNUAL RATES OF
                              NUMBER OF        TOTAL       EXERCISE                    COMMON SHARE PRICE
                              SECURITIES      OPTIONS       PRICE                       APPRECIATION FOR
                              UNDERLYING    GRANTED TO       PER                         OPTION TERM(1)
                               OPTIONS     EMPLOYEES IN     COMMON     EXPIRATION    -----------------------
NAME                          GRANTED(2)    FISCAL YEAR    SHARE(3)       DATE         5%(4)        10%(5)
- ----                          ----------   -------------   --------   ------------   ----------   ----------
<S>                           <C>          <C>             <C>        <C>            <C>          <C>
Timothy H. Callahan.........   200,000          4.9%        $21.00    July 7, 2007   $2,641,000   $6,694,000
Gary A. Beller..............   100,000          2.4          21.00    July 7, 2007    1,321,000    3,347,000
Richard D. Kincaid..........   150,000          3.7          21.00    July 7, 2007    1,981,000    5,020,000
Michael A. Steele...........   150,000          3.7          21.00    July 7, 2007    1,981,000    5,020,000
Stanley M. Stevens..........   150,000          3.7          21.00    July 7, 2007    1,981,000    5,020,000
</TABLE>
 
- ---------------
(1) In accordance with the rules of the Commission, these amounts are the
    hypothetical gains or "option spreads" that would exist for the respective
    options based on assumed rates of annual compound share price appreciation
    of 5% and 10% from the date the options were granted over the full option
    term. No gain to the optionee is possible without an increase in the price
    of EOP Common Shares, which would benefit all shareholders.
 
                                       149
<PAGE>   158
 
(2) All options are granted at the fair market value of the EOP Common Shares at
    the date of grant. Options granted are for a term of not more than ten years
    from the date of grant and vest in three equal annual installments (rounded
    to the nearest whole EOP Common Share) over three years.
 
(3) Based on the IPO price.
 
(4) An annual compound share price appreciation of 5% from the IPO price of
    $21.00 per EOP Common Share yields a price of $34.21 per EOP Common Share.
 
(5) An annual compound share price appreciation of 10% from the IPO price of
    $21.00 per EOP Common Share yields a price of $54.47 per EOP Common Share.
 
OPTION AND RESTRICTED SHARE PLAN
 
     In July 1997, EOP adopted the Employee Plan for the purpose of attracting
and retaining highly qualified executive officers, trustees, employees and
consultants. EOP has reserved EOP Common Shares for issuance pursuant to the
Employee Plan. In connection with the establishment of the Employee Plan, EOP
granted additional options to purchase EOP Common Shares to certain officers,
trustees, employees and consultants of EOP at the IPO price.
 
     Grants under the Employee Plan have been and will continue to be exempt
under Rule 16b-3 under the Exchange Act. The Employee Plan is administered by
the Compensation Committee and provides for the granting of share options, share
appreciation rights or restricted shares with respect to up to 6.8% of EOP's
outstanding EOP Common Shares (calculated on a fully diluted basis) to executive
or other employees of EOP. Share options may be granted in the form of
"incentive stock options" (as defined in Section 422 of the Code), or
nonstatutory share options, and are exercisable for up to 10 years following the
date of the grant. The exercise price of each option will be set by the
Compensation Committee; provided, however, that the price per share must be
equal to or greater than the fair market value of the EOP Common Shares on the
grant date.
 
     The Employee Plan also provides for the issuance of share appreciation
rights which will generally entitle a holder to receive cash or shares, as
determined by the Compensation Committee at the time of exercise, equal to the
difference between the exercise price and the fair market value of the EOP
Common Shares. In addition, the Employee Plan permits EOP to issue restricted
EOP Common Shares to executive or other key employees upon such terms and
conditions as shall be determined by the Compensation Committee in its sole
discretion.
 
401(K) PLAN
 
     EOP intends to establish the Equity Office Properties Trust Section 401(k)
Savings/Retirement Plan (the "401(k) Plan") to cover eligible employees of EOP
and any designated affiliate.
 
     The 401(k) Plan will permit eligible employees of EOP to defer up to 16% of
their annual compensation, subject to certain limitations imposed by the Code.
The employees' elective deferrals are immediately vested and nonforfeitable upon
contribution to the 401(k) Plan.
 
SUPPLEMENTAL RETIREMENT SAVINGS PLAN
 
     In November 1997, the Compensation Committee of EOP adopted the EOP
Supplemental Retirement Savings Plan (the "SRP") for employees of EOP with
annual compensation of in excess of $100,000.
 
     The SRP permits eligible employees to defer a portion of their annual
compensation in excess of that permitted under the 401(k) Plan for retirement
and certain educational expenses of their children.
 
EMPLOYEE SHARE PURCHASE PLAN
 
     In July 1997, EOP adopted its 1997 Non-Qualified Employee Share Purchase
Plan (the "Purchase Plan") for the purpose of attracting and retaining highly
qualified executive officers, trustees and employees. EOP has reserved EOP
Common Shares for issuance pursuant to the Purchase Plan.
 
                                       150
<PAGE>   159
 
     The Purchase Plan is qualified under Rule 16b-3 under the Exchange Act. The
Purchase Plan will be administered by the Compensation Committee and allows
eligible employees and trustees to acquire an interest in EOP through the
purchase of EOP Common Shares from EOP at a discount from fair market value. A
total of 2,000,000 EOP Common Shares of EOP (subject to adjustment for share
splits, share distributions, recapitalizations or other corporate
restructurings) have been reserved for issuance under the Purchase Plan.
 
     EOP Common Shares will be offered under the Purchase Plan in semi-annual
offering periods. Eligible employees and trustees who elect to participate in
the Purchase Plan will be able to use funds accumulated through cash
contributions or payroll deductions to purchase EOP Common Shares at a price
less than the fair market value of the EOP Common Shares on the date of
purchase.
 
INCENTIVE COMPENSATION
 
     EOP intends to establish an incentive compensation plan for key officers of
EOP and its subsidiaries and affiliates. This plan will provide for payment of
cash bonuses to participating officers after evaluating the officer's
performance and the overall performance of EOP. The Chief Executive Officer will
make recommendations to the Compensation Committee of the EOP Board, which will
make the final determination for the award of bonuses. The Compensation
Committee will determine such bonuses, if any, for the Chief Executive Officer.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION
 
     Title 8 of the Corporations and Associations Article of the Annoted Code of
Maryland, as amended (the "Maryland REIT Law") permits a Maryland real estate
investment trust to include in its declaration of trust a provision limiting the
liability of its trustees and officers to the trust and its shareholders for
money damages except for liability resulting from (a) actual receipt of an
improper benefit or profit in money, property or services or (b) active and
deliberate dishonesty established by a final judgment as being material to the
cause of action. The Declaration of Trust contains such a provision which
eliminates such liability to the maximum extent permitted by the Maryland REIT
Law.
 
     The Declaration of Trust authorizes EOP, to the maximum extent permitted by
Maryland law, to obligate itself to indemnify and to pay or reimburse reasonable
expenses in advance of final disposition of a proceeding to (a) any present or
former trustee or officer or (b) any individual who, while a trustee of EOP and
at the request of EOP, serves or has served as a director, officer, partner,
trustee, employee or agent of another corporation, partnership, joint venture,
trust, employee benefit plan or any other enterprise from and against any claim
or liability to which such person may become subject or which such person may
incur by reason of his or her status as a present or former trustee or officer
of EOP. The EOP Bylaws obligate EOP, to the maximum extent permitted by Maryland
law, to indemnify (a) any trustee, officer or shareholder or any former trustee,
officer or shareholder (including any individual who, while a trustee, officer
or shareholder and at the express request of EOP, serves or has served another
corporation, partnership, joint venture, trust, employee benefit plan or any
other enterprise as a director, officer, shareholder, partner or trustee of such
corporation, partnership, joint venture, trust, employee benefit plan or other
enterprise) who has been successful, on the merits or otherwise, in the defense
of a proceeding to which he was made a party by reason of service in such
capacity, against reasonable expenses incurred by him in connection with the
proceeding or (b) any trustee or officer or any former trustee or officer
against any claim or liability to which he may become subject by reason of such
status.
 
     The Maryland REIT Law permits a Maryland real estate investment trust to
indemnify and advance expenses to its trustees, officers, employees and agents
to the same extent as permitted by the MGCL for directors and officers of
Maryland corporations. The MGCL permits a corporation to indemnify its present
and former directors and officers, among others, against judgments, penalties,
fines, settlements and reasonable expenses actually incurred by them in
connection with any proceeding to which they may be made a party by reason of
their service in those or other capacities unless it is established that (a) the
act or omission of the director or officer was material to the matter giving
rise to the proceeding and (i) was
 
                                       151
<PAGE>   160
 
committed in bad faith or (ii) was the result of active and deliberate
dishonesty, (b) the director or officer actually received an improper personal
benefit in money, property or services or (c) in the case of any criminal
proceeding, the director or officer had reasonable cause to believe that the act
or omission was unlawful. The foregoing limitations on indemnification are
expressly set forth in the EOP Bylaws. However, under the MGCL, a Maryland
corporation may not indemnify for an adverse judgment in a suit by or in the
right of the corporation or for a judgment of liability on the basis that a
personal benefit was improperly received, unless, in either case, a court orders
indemnification and then only for expenses. In addition, the MGCL permits a
corporation to advance reasonable expenses to a director or officer upon the
corporation's receipt of (a) a written affirmation by the director or officer of
his good faith belief that he has met the standard of conduct necessary for
indemnification by the corporation and (b) a written undertaking by or on his
behalf to repay the amount paid or reimbursed by the corporation if it shall
ultimately be determined that the standard of conduct was not met.
 
     The EOP Partnership Agreement also provides for indemnification of EOP and
its officers and trustees to the same extent that indemnification is provided to
officers and trustees of EOP in its Declaration of Trust, and limits the
liability of EOP and its officers and trustees to EOP Partnership and its
respective partners to the same extent that the liability of the officers and
trustees of EOP to EOP and its shareholders is limited under the Declaration of
Trust.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to trustees, officers or persons controlling the registrant
pursuant to the foregoing provisions, the registrant has been informed that in
the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Act and is therefore unenforceable.
 
     EOP has entered into indemnification agreements with each of its trustees
and executive officers. The indemnification agreements require, among other
things, that EOP indemnify its trustees and executive officers to the fullest
extent permitted by law and advance to the trustees and executive officers all
related expenses, subject to reimbursement if it is subsequently determined that
indemnification is not permitted. Under these agreements, EOP must also
indemnify and advance all expenses incurred by trustees and executive officers
seeking to enforce their rights under the indemnification agreements and may
cover trustees and executive officers under EOP's trustees and officers'
liability insurance. Although the form of indemnification agreement offers
substantially the same scope of coverage afforded by law, as a traditional form
of contract it may provide greater assurance to trustees and executive officers
that indemnification will be available. In addition, Mr. Dobrowski will be
indemnified by GMIMCO and will be covered by an insurance policy maintained by
GM, of which GMIMCO is a subsidiary, in connection with serving on the EOP
Board.
 
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     In addition to the transactions that are expected to occur in connection
with the Mergers, which are described in the section "THE MERGERS -- Interests
of Certain Persons in the Merger" and the transactions that occurred in
connection with the organization of EOP, which are described in the section
entitled "BUSINESS OF EOP -- Formation Transactions" above, the following
transactions have occurred.
 
SALE OF EOP COMMON SHARES TO MR. ZELL
 
     Prior to EOP's IPO, EOP sold 1,000 unregistered EOP Common Shares to Mr.
Zell for a purchase price of $25.00 per EOP Common Share. In addition, pursuant
to certain option agreements, ZFT Partnership, a partnership comprised of
certain trusts established for the benefit of the family of Mr. Zell, acquired
for cash from certain unaccredited investors in the ZML REITs the interests
owned by them in such ZML REITs. ZFT Partnership paid approximately $32,400 for
such interests which, upon consummation of the IPO, represented approximately
1,543 EOP Common Shares.
 
LEASES AND PARKING OPERATIONS
 
     EOP leases office space owned by Two North Riverside Plaza Joint Venture, a
partnership comprised of trusts, established for the benefit of the families of
Mr. Zell and Mr. Lurie, at Two North Riverside Plaza, Chicago, Illinois 60606.
In addition, EGI, an entity owned by the Equity Group Owners, and its affiliates
have in the past provided EOP and its predecessors with certain administrative,
office facility services and other services with respect to certain aspects of
EOP's business, including, but not limited to, financial and accounting
services, tax services, investor relations, and other services. EOP paid
approximately $12,786,000
 
                                       152
<PAGE>   161
 
during the year ended December 31, 1996 and expects to pay in the aggregate
approximately $9,600,000 to EGI and its affiliates during 1997 for such office
space and services, which amount is calculated to approximate a market rental
rate for the office space and the actual cost of providing these services. The
independent members of the EOP Board will annually review and approve the rates
charged by EGI for services rendered to EOP.
 
     EQR and certain other affiliates of EOP lease space in certain of the
Office Properties. The terms of the leases are consistent with terms of
unaffiliated tenants' leases. Total rents and other amounts paid by affiliates
under their respective leases were approximately $4,081,200, $2,272,800,
$3,471,500 and $2,657,500 for the nine months ended September 30, 1997 and 1996,
and the years ended December 31, 1996 and 1995, respectively.
 
     SZ Parking Limited Partnership, an affiliate of the Equity Group Owners,
has an indirect 10% limited partnership interest in Standard Parking Limited
Partnership ("SPLP") which manages the parking operations of certain EOP Office
Properties. Management believes amounts paid to SPLP are equivalent to market
rates for such services.
 
     EOP entered into various lease agreements with SPLP or affiliates of SPLP
whereby SPLP or its affiliates leased the North Loop Transportation Center
Parking Facility, the Milwaukee Center Parking Garage, and the Boston Harbor
Garage and the Adams and Wabash Garage from EOP. Certain of these lease
agreements provide SPLP or its affiliates with annual successive options to
extend the term of the lease through various dates. The rent paid in the nine
months ended September 30, 1997 and 1996, and in the years ended December 31,
1996 and 1995 under these lease agreements was approximately $7,888,700,
$2,334,600, $3,161,500 and $1,691,600, respectively. The annual rent to be paid
to EOP for 1997 is approximately $11,049,000. In addition, EOP may receive
additional rent based upon actual gross revenues generated by these Parking
Facilities. In accordance with certain of these leases, EOP may be obligated to
make an early termination payment if agreement is not reached as to rent amounts
to be paid.
 
EQUITY GROUP DISTRIBUTIONS AND FEES
 
     The partners of the ZML Partners, affiliates of the Equity Group Owners,
have received distributions and fees from EOP through their ownership interests
in the ZML Partners of approximately $8,603,600 for the year ended December 31,
1996 and received distributions and fees of approximately $22,646,100 for the
nine months ended September 30, 1997.
 
MISCELLANEOUS
 
     As described under "FEDERAL INCOME TAX CONSIDERATIONS -- Requirements for
Qualification as a REIT -- Closing Agreements with the IRS with Respect to ZML
REITs I and II," in March 1997 the ZML Partners of ZML Opportunity Partnerships
I and II made certain payments to the IRS in connection with closing agreements
pursuant to which the IRS agreed that neither ZML REIT I nor ZML REIT II would
be disqualified as a REIT as a result of certain technical violations of the
REIT provisions of the Code. The amounts of such payments were $15,000 and
$5,270,000, respectively, for ZML REITs I and II.
 
     EOP Management Corp. has entered into third-party management contracts, on
terms equivalent to third-party transactions, with respect to properties not
owned by EOP but that are owned or controlled by the Equity Group. See "RISK
FACTORS -- Conflicts of Interest in Connection with Formation and Business of
EOP." Income recognized for similar services rendered for the nine months ended
September 30, 1997 and 1996 and the years ended December 31, 1996 and 1995 was
approximately $3,841,000, $3,126,000, $5,120,000, and $5,899,000, respectively.
 
     Rosenberg & Liebentritt, P.C., a law firm in which Ms. Rosenberg, a trustee
of EOP, was a principal until September 11, 1997, and is currently of counsel
to, received legal fees from EOP of approximately $1,900,000, $2,461,000,
$3,480,500 and $3,230,100 for the nine months ended September 30, 1997 and 1996
and the years ended December 31, 1996 and 1995, respectively.
 
     Certain services for EOP's tenants that may not be permissibly undertaken
by a REIT are conducted through a service corporation owned entirely by
affiliates of the Equity Group Owners. EOP pays such service corporation a fee
for such services. EOP has no control over, or ownership interest in, such
service corporation, which operates as an independent contractor. EOP may
terminate such services at any time upon 30-days notice.
 
                                       153
<PAGE>   162
 
          EOP PARTNERSHIP POLICIES WITH RESPECT TO CERTAIN ACTIVITIES
 
     The following is a discussion of the policies with respect to investments,
financing and certain other activities of EOP Partnership and EOP. These
policies are determined by the EOP Board and may be amended or revised from time
to time at the discretion of the EOP Board without notice to or a vote of the
EOP Shareholders, or the limited partners of EOP Partnership, except that
changes in certain policies with respect to conflicts of interest must be
consistent with legal requirements.
 
INVESTMENT POLICIES
 
     INVESTMENTS IN REAL ESTATE OR INTERESTS IN REAL ESTATE.  All of the
investment activities of EOP are conducted through EOP Partnership. EOP's
investment objectives are to increase cash flow and the value of the Properties,
and to acquire established income-producing office and parking properties with
cash flow growth potential. Additionally, where prudent and possible, EOP will
seek to upgrade the existing EOP Properties and any newly acquired office
properties. EOP's business will be focused on office properties and will include
parking facilities. Where appropriate, and subject to REIT qualification rules,
EOP Partnership may sell certain of its Properties.
 
     EOP expects to pursue its investment objectives through the direct and
indirect ownership of properties and the ownership of interests in other
entities. EOP will focus on properties in those markets where EOP currently has
operations and in new markets targeted by management. See "BUSINESS OF EOP --
Business and Growth Strategies." EOP anticipates that newly acquired properties
will be located in the United States. Future investments, however, including the
activities described below, will not be limited to any geographic area or to a
specified percentage of EOP's assets.
 
     EOP also may participate with other entities in property ownership through
joint ventures or other types of co-ownership. Equity investments may be subject
to existing mortgage financing and other indebtedness or such financing or
indebtedness may be incurred in connection with acquiring investments. Any such
financing or indebtedness will have priority over EOP's equity interest in such
property. Upon consummation of the Merger, EOP will succeed to Beacon's
interests in the Beacon Joint Venture Properties. See "THE BEACON PROPERTIES."
 
     INVESTMENTS IN REAL ESTATE MORTGAGES.  While EOP's emphasis will be on
equity real estate investments, it may, in its discretion, invest in mortgages
on office properties and other similar interests. A portion of EOP's interest in
one EOP Office Property, and in two EOP Parking Facilities, consists of
ownership of the mortgage securing such EOP Properties. EOP does not intend to
invest to a significant extent in mortgages or deeds of trust, but may acquire
mortgages, primarily as a strategy for acquiring ownership of a property or the
economic equivalent thereof, subject to the investment restrictions applicable
to REITs. See "FEDERAL INCOME TAX CONSIDERATIONS -- Requirements for
Qualification as a REIT -- Income Tests Applicable to REITs" and "-- Asset Tests
Applicable to REITs." In addition, EOP may invest in mortgage-related securities
and/or may seek to issue securities representing interests in such
mortgage-related securities as a method of raising additional funds. Upon
consummation of the Mergers, EOP will succeed to Beacon's interests in mortgages
on certain properties. See "THE BEACON PROPERTIES."
 
     SECURITIES OF OR INTERESTS IN PERSONS PRIMARILY ENGAGED IN REAL ESTATE
ACTIVITIES AND OTHER ISSUERS. Although EOP has no current intention of making
such an investment, EOP also may legally invest in securities of entities
engaged in real estate activities or securities of other issuers, including for
the purpose of exercising control over such entities, subject to the gross
income and asset tests necessary for REIT qualification. EOP may acquire all or
substantially all of the securities or assets of other REITs or similar entities
where such investments would be consistent with EOP's investment policies. In
any event, EOP does not intend that its investments in securities will require
it or EOP Partnership to register as an "investment company" under the 1940 Act.
Upon consummation of the Company Merger, EOP will succeed to Beacon's interest
in BeaMetFed, a REIT which owns 75-101 Federal Street.
 
                                       154
<PAGE>   163
 
FINANCING POLICIES
 
     In addition to the limitations on indebtedness which are imposed on EOP
under the Credit Facilities and the Indenture, EOP intends to maintain a Debt to
Market Capitalization Ratio of approximately 50% or less. This policy differs
from conventional mortgage debt-to-equity ratios which are asset-based ratios.
EOP's Debt to Market Capitalization Ratio is equal to the total consolidated and
unconsolidated debt of EOP as a percentage of the market value of outstanding
EOP Common Shares and EOP Partnership Units (not owned by EOP) plus total
consolidated and unconsolidated debt, but excluding (i) all nonrecourse
consolidated debt in excess of EOP's proportionate share of such debt and (ii)
all nonrecourse unconsolidated debt of partnerships in which EOP is a limited
partner. EOP, however, may from time to time re-evaluate this policy and
decrease or increase such ratio in light of then current economic conditions,
relative costs to EOP of debt and equity capital, market values of its
Properties, growth and acquisition opportunities and other factors. There is no
limit on the Debt to Market Capitalization Ratio imposed by either the
Declaration of Trust, the EOP Bylaws or the EOP Partnership Agreement. To the
extent that the EOP Board determines to obtain additional capital, EOP may issue
equity securities, or cause EOP Partnership to issue additional EOP Partnership
Units or debt securities, or retain earnings (subject to provisions in the Code
requiring distributions of taxable income to maintain REIT status), or a
combination of these methods. As long as EOP Partnership is in existence, the
net proceeds of all equity capital raised by EOP will be contributed to EOP
Partnership in exchange for additional interests in EOP Partnership, which will
dilute the ownership interest, if any, of the Equity Group and any other holders
of EOP Partnership Units.
 
     It is EOP's policy that Equity Office Properties Trust will not incur
indebtedness other than short-term trade, employee compensation, distributions
payable or similar indebtedness that will be paid in the ordinary course of
business, and that indebtedness shall instead be incurred by EOP Partnership to
the extent necessary to fund the business activities conducted by EOP
Partnership and its subsidiaries. To the extent that the EOP Board determines to
obtain debt financing in addition to the existing mortgage indebtedness, EOP
intends to do so generally through mortgages on its Properties, the Credit
Facilities and the Proposed Note Offering; however, EOP may cause EOP
Partnership to issue additional debt securities in the future. Such indebtedness
may be recourse, non-recourse or cross-collateralized and may contain
cross-default provisions. The net proceeds of any debt securities issued
directly by EOP (rather than by EOP Partnership) will be lent to EOP Partnership
on substantially the same terms and conditions as are incurred by EOP. EOP does
not have a policy limiting the number or amount of mortgages that may be placed
on any particular property, but mortgage financing instruments usually limit
additional indebtedness on such properties. In the future, EOP may seek to
extend, expand, reduce or renew the Credit Facilities, or obtain new credit
facilities or lines of credit, subject to its general policy on debt
capitalization, for the purpose of making acquisitions or capital improvements
or providing working capital or meeting the taxable income distribution
requirements for REITs under the Code.
 
LENDING POLICIES
 
     EOP may consider offering purchase money financing in connection with the
sale of EOP Properties where the provision of such financing will increase the
value received by EOP for the property sold.
 
CONFLICT OF INTEREST POLICIES
 
     OFFICERS AND TRUSTEES OF EOP.  Mr. Zell, the Chairman of the EOP Board,
through affiliated entities is engaged in certain office real estate activities,
both inside and outside the markets in which the Properties are located. Mr.
Zell, therefore, may be subject to certain conflicts of interest in fulfilling
his responsibilities to EOP and EOP Shareholders. See "RISK FACTORS -- Conflicts
of Interest in Connection with Formation and Business of EOP." Under Maryland
law, contracts or other transactions between EOP and a trustee (or an entity in
which a trustee has a material financial interest) may be void or voidable.
However, the MGCL provides that any such contract or transaction will not be
void or voidable if (a) it is authorized, approved or ratified, after disclosure
of, or with knowledge of, the common directorship or interest, by the
affirmative vote of a majority of disinterested directors (even if the
disinterested directors constitute less than a quorum) or by the affirmative
vote of a majority of the votes cast by disinterested shareholders entitled to
vote, or (b) it is fair
 
                                       155
<PAGE>   164
 
and reasonable to the corporation. While the Maryland REIT Law does not have a
comparable provision for trustees, a court may apply the principles of the MGCL
to contracts or transactions between EOP and its trustees. EOP believes that
this procedure and Mr. Zell's non-competition agreement will help to eliminate
or minimize certain potential conflicts of interest. Pursuant to the EOP Bylaws,
without the approval of a majority of the disinterested trustees, EOP and its
Subsidiaries will not (i) acquire from or sell to any trustee, officer or
employee of EOP, or any entity in which a trustee, officer or employee of EOP
owns more than a 1% interest, or acquire from or sell to any affiliate of any of
the foregoing, any assets or other property of EOP or its Subsidiaries, (ii)
make any loan to or borrow from any of the foregoing persons, or (iii) engage in
any other material transaction with any of the foregoing persons. Each
transaction of the type described above will be in all respects on such terms as
are, at the time of the transaction and under the circumstances then prevailing,
fair and reasonable to EOP and its Subsidiaries. The foregoing does not apply to
EOP Management Corp. and will not apply to the Beacon Service Companies.
 
     POLICIES APPLICABLE TO ALL TRUSTEES.  Under Maryland law, each trustee is
obligated to offer to EOP any opportunity (with certain limited exceptions)
which comes to him or her and which EOP could reasonably be expected to have an
interest in developing or acquiring. In addition, under Maryland law, any
contract or other transaction between a corporation and any director or any
other corporation, firm or other entity in which the director is a director or
has a material financial interest may be void or voidable unless approved as
described above.
 
     LEASED OFFICE SPACE.  EOP leases office space at Two North Riverside Plaza,
Chicago, Illinois 60606, a building that is owned by a single purpose entity
affiliated with the Equity Group Owners. EOP expects to pay in the aggregate
approximately $1.13 million in base rent and escalations during 1997. EOP
believes it is paying fair market rent for this space. The disinterested members
of the EOP Board will annually review and approve the rates charged to EOP for
such office space.
 
POLICIES WITH RESPECT TO OTHER ACTIVITIES
 
     EOP may, but does not presently intend to, make investments other than as
previously described. All investments will be related to the office property and
parking facility business. EOP will make investments only through EOP
Partnership. EOP will have authority to offer EOP Common Shares or other equity
or debt securities of EOP Partnership in exchange for property and to repurchase
or otherwise reacquire EOP Common Shares or any other securities and may engage
in such activities in the future. Similarly, EOP Partnership may offer
additional EOP Partnership Units or other equity interests in EOP Partnership
that are exchangeable into EOP Common Shares or EOP Preferred Shares, in
exchange for property. EOP Partnership also may make loans to joint ventures in
which it may or may not participate in the future. Neither EOP nor EOP
Partnership will engage in trading, underwriting or the agency distribution or
sale of securities of other issuers. At all times, EOP intends to cause EOP
Partnership to make investments in such a manner as to be consistent with the
requirements of the Code to qualify as a REIT unless, because of circumstances
or changes in the Code (or the regulations promulgated thereunder), the EOP
Board determines that it is no longer in the best interests of EOP to continue
to qualify as a REIT. EOP's policies with respect to such activities may be
reviewed and modified from time to time by the EOP Board without notice to or
the vote of the EOP Shareholders.
 
                         EOP PARTNERSHIP AGREEMENT AND
                         UNITS OF PARTNERSHIP INTEREST
 
     The following summary of the terms of the units of partnership interest of
EOP Partnership and the EOP Partnership Agreement, including the description of
certain provisions thereof set forth elsewhere in this Proxy
Statement/Prospectus, is qualified in its entirety by reference to the EOP
Partnership Agreement, which is filed as an exhibit to the Registration
Statement of which this Proxy Statement/Prospectus is a part.
 
                                       156
<PAGE>   165
 
CAPITALIZATION
 
     The EOP Partnership Agreement establishes (i) EOP Class A Partnership
Units, of which, as of the date of this Proxy Statement/Prospectus, there are
175,795,840 issued and outstanding, and (ii) EOP Class B Partnership Units, of
which, as of the date of this Proxy Statement/Prospectus, there are 3,399,977
outstanding. Prior to the Effective Time, EOP, as the managing general partner
of EOP Partnership, shall take such actions as shall be necessary to cause EOP
Partnership to issue in the Partnership Merger 8,000,000 EOP Series A Preferred
Units in exchange for the outstanding Beacon Series A Preferred Units.
 
ISSUANCE OF ADDITIONAL PARTNERSHIP INTERESTS
 
     The EOP Managing General Partner is authorized to cause EOP Partnership
from time to time to issue to partners of EOP Partnership (including the EOP
Managing General Partner and its affiliates) or other Persons EOP Partnership
Units or other partnership interests of EOP Partnership in one or more classes,
or in one or more series of any of such classes, with such designations,
preferences and relative, participating, optional or other special rights,
powers and duties (which may be senior to those of the EOP Partnership Units),
as will be determined by the EOP Managing General Partner, in its sole and
absolute discretion, provided that, no such EOP Partnership Units or other
partnership interests will be issued to the EOP Managing General Partner unless
either (i) such EOP Partnership Units or other partnership interests are issued
in connection with the grant, award or issuance of shares or other equity
interests in the EOP Managing General Partner having designations, preferences
and other rights such that the economic interests attributable to such shares or
other equity interests are substantially similar to the designations,
preferences and other rights of such EOP Partnership Units or other partnership
interests, respectively, issued to the EOP Managing General Partner and the EOP
Managing General Partner contributes to EOP Partnership the proceeds of such
shares or other equity interests received by it or (ii) the additional EOP
Partnership Units or other partnership interests are issued to all partners
holding EOP Partnership Units or other partnership interests in the same class,
respectively, in proportion to their respective percentage interests in such EOP
Partnership Units or class, as the case may be.
 
     At the election of the EOP Managing General Partner, in its sole and
absolute discretion, either EOP Class A Partnership Units or EOP Class B
Partnership Units may be issued to newly admitted partners, provided that, any
EOP Partnership Unit that is not specifically designated by the EOP Managing
General Partner as being of a particular class shall be deemed to be an EOP
Class A Partnership Unit. EOP Preferred Units shall be issued to EOP in the
Partnership Merger in exchange for Beacon Preferred Units currently held by
Beacon.
 
CAPITAL CONTRIBUTIONS
 
     No partner of EOP Partnership is required to make additional capital
contributions to EOP Partnership, except that the EOP Managing General Partner
is generally required to contribute net proceeds of the sale of equity interests
in the EOP Managing General Partner to EOP Partnership. No limited or general
partner receiving EOP Partnership Units in the Partnership Merger is required to
pay to the EOP Partnership any deficit or negative balance which may exist in
its capital account.
 
DISTRIBUTIONS
 
     The EOP Partnership Agreement requires the distribution, on a quarterly or
shorter basis (a "Distribution Period"), of "Available Cash" (as defined below),
(i) first, to the EOP Managing General Partner of an amount that in the
aggregate equals the amount of the distributions declared and payable with
respect to the EOP Preferred Shares for such Distribution Period and (ii)
second, to the partners of EOP Partnership in proportion to their percentage
interests in EOP Partnership (other than such interests represented by their EOP
Preferred Units) which, for any partner, is generally determined, except as
described below, by the number of EOP Partnership Units it owns relative to the
total number of EOP Partnership Units outstanding. "Available Cash" is generally
defined as net cash flow from operations plus any reduction in reserves and
 
                                       157
<PAGE>   166
 
minus interest and principal payments on debt, capital expenditures, any
additions to reserves and other adjustments.
 
     In the event that both EOP Class A Partnership Units and EOP Class B
Partnership Units are outstanding on the record date for a Distribution Period,
the Available Cash for such Distribution Period shall be allocated between the
EOP Class A Partnership Units and the EOP Class B Partnership Units, as well as
among any groups of EOP Class B Partnership Units which were outstanding for
different amounts of time during the Distribution Period, based on the total
number of days during such Distribution Period that each such class and or group
of units were outstanding. The portion of the Available Cash thus allocated
shall, in turn, be allocated among the holders of the applicable units in
proportion to their percentage interests in EOP Partnership as described above.
In no event may a partner receive a distribution of Available Cash with respect
to an EOP Class A Partnership Unit if such partner is entitled to receive a
distribution out of such Available Cash with respect to an EOP Common Share for
which such EOP Class A Partnership Unit has been redeemed or exchange. In no
event may a partner receive a distribution of Available Cash with respect to any
EOP Class B Partnership Unit for any Distribution Period ending prior to the
date on which such EOP Class B Partnership Unit was issued. Notwithstanding
anything to the contrary above, EOP Partnership must distribute to the EOP
Managing General Partner an amount equal to the aggregate amount necessary to
redeem any EOP Preferred Shares which have been called for redemption by the EOP
Managing General Partner. Such distribution shall be made in redemption of a
number of EOP Preferred Units equal to the number of EOP Preferred Shares to be
redeemed with the funds to be distributed.
 
PREEMPTIVE RIGHTS
 
     Except to the extent expressly granted by EOP Partnership pursuant to an
agreement other than the EOP Partnership Agreement, no person or entity,
including without limitation any partner of EOP Partnership, has any preemptive,
preferential or other similar right with respect to (i) additional capital
contributions or loans to EOP Partnership or (ii) the issuance or sale of any
EOP Partnership Units or other partnership interests of EOP Partnership.
 
LIQUIDATION PREFERENCES
 
     Upon liquidation of EOP Partnership, partners holding EOP Preferred Units
shall be entitled to receive out the proceeds thereof, prior to any
distributions to holders of the EOP Partnership Units, pro rata, in the ratio in
which they hold such EOP Preferred Units, an amount equal to the liquidation
preference with respect to the EOP Preferred Shares plus any accrued but unpaid
distributions with respect to such shares.
 
CONVERSION OR REDEMPTION OF PARTNERSHIP INTERESTS
 
     Each EOP Class B Partnership Unit shall be converted automatically into an
EOP Class A Partnership Unit on the day immediately following the record date
for the Distribution Period during which such EOP Class B Unit was issued.
 
     Subject to certain limitations described below, each limited partner other
than EOP has the right to require the redemption of such limited partner's EOP
Partnership Units at any time or from time to time beginning on the first
anniversary (or, in the case of EOP Partnership Units issued to the ZML
Investors in the Formation Transactions, the second anniversary) of the issuance
of such EOP Partnership Units to it or, in the case of any or all EOP Class A
Partnership Units held by it, on or after such earlier date as the EOP Managing
General Partner designates in its sole and absolute discretion (the "Unit
Redemption Right"). With respect to any EOP Partnership Units to be issued in
the Partnership Merger in exchange for Beacon Partnership Units, the foregoing
holding period shall be deemed to commence on the date of issuance of the Beacon
Partnership Units to the limited partners holding such EOP Partnership Units. In
addition, each limited partner may exercise such limited partner's Unit
Redemption Right, regardless of the length of time such limited partners has
held such limited partner's EOP Partnership Units, during the period commencing
on the date the EOP Managing General Partner has given the limited partners
notice of its intention to make an extraordinary distribution of cash or
property to its shareholders or effect a merger, a sale of all or
 
                                       158
<PAGE>   167
 
substantially all of its assets or any other similar extraordinary transaction
and ending on the record date to determine shareholders eligible to receive such
distribution or to vote upon the approval of such merger, sale or other
extraordinary transaction (or, if no such record date is applicable, at least 20
business days before the consummation of such merger, sale or other
extraordinary transaction). A limited partner may exercise such limited
partner's Unit Redemption Right by giving written notice thereof to EOP
Partnership and the EOP Managing General Partner. The EOP Partnership Units
specified in such notice shall be redeemed on the 10th business date following
the date on which EOP received the redemption notice or, in the case of a the
exercise of a Unit Redemption Right in connection with an extraordinary
transaction, the date on which EOP Partnership and the EOP Managing General
Partner received the redemption notice.
 
     Unless the EOP Managing General Partner elects to assume and perform EOP
Partnership's obligation with respect to a Unit Redemption Right, as described
below, a limited partner which exercises such limited partner's Unit Redemption
Right will receive cash from EOP Partnership in an amount equal to the market
value of the EOP Partnership Units to be redeemed. The market value of an EOP
Partnership Unit for this purpose will be equal to the average of the closing
trading price of an EOP Common Share on the NYSE for the ten trading days before
the day on which the redemption notice was given. In lieu of EOP Partnership's
acquiring the EOP Partnership Units for cash, the EOP Managing General Partner
has the right to elect to acquire on the redemption date the EOP Partnership
Units directly from a limited partner exercising the Unit Redemption Right, in
exchange for cash in the amount specified above or by issuance of a number of
EOP Common Shares equal to the number of EOP Partnership Units offered for
redemption adjusted as specified in the EOP Partnership Agreement to take into
account prior share distributions or subdivision or combinations of EOP Common
Shares. Upon exercise of the Unit Redemption Right, the limited partner's right
to receive distributions of the EOP Partnership Units so redeemed or exchanged
will cease. At least 1,000 EOP Partnership Units (or all remaining EOP
Partnership Units owned by the limited partner if less than 1,000 units) must be
redeemed each time the Unit Redemption Right is exercised. No redemption or
exchange can occur if delivery of common shares therefor would be prohibited
either under the provision of EOP's Declaration of Trust or under applicable
federal or state securities laws, regardless of whether the EOP Managing General
Partner would in fact assume and satisfy the Unit Redemption Right. EOP will at
times reserve and keep available out of its authorized but unissued EOP Common
Shares, solely for the purpose of effecting the issuance of EOP Common Shares
pursuant to the Unit Redemption Right, a sufficient number of EOP Common Shares
as shall from time to time be sufficient for the redemption of all outstanding
EOP Partnership Units not owned by EOP.
 
     In the event any EOP Preferred Shares have been called for redemption, a
number of EOP Preferred Units equal to the number of EOP Preferred Shares called
for redemption must be redeemed. Such redemption shall be effectuated at such
time and in such manner as to allow the redemption of EOP Preferred Shares to be
completed in a timely fashion in accordance with the requirements applicable
thereto.
 
MANAGEMENT
 
     EOP Partnership was formed on November 11, 1996, as a limited partnership
under the Partnership Act. EOP is the managing general partner of EOP
Partnership and expects at all times to own a majority interest in EOP
Partnership. ZML Opportunity Partnership II (of which EOP is the managing
general partner) is an additional general partner in EOP Partnership.
 
     Except as otherwise expressly provided in the EOP Partnership Agreement,
all management powers over the business and affairs of EOP Partnership are
exclusively vested in the general partners and no limited partner has any right
to participate in or exercise control or management power over the business and
affairs of EOP Partnership or has the power to sign documents for or otherwise
bind EOP Partnership. The EOP Managing General Partner has full power and
authority to do all things it deems necessary or desirable to conduct the
business of EOP Partnership, subject to the consent of the limited partners in
certain limited circumstances. In particular, the EOP Managing General Partner
is under no obligation to consider the tax consequences to limited partners when
making decisions for the benefit of EOP Partnership. The limited partners have
no power to remove the general partners.
 
                                       159
<PAGE>   168
 
REIMBURSEMENT OF EOP; TRANSACTIONS WITH EOP AND ITS AFFILIATES
 
     The EOP Managing General Partner is not entitled to receive any
compensation for its services as the managing general partner of EOP
Partnership. The EOP Managing General Partner, however, as a partner in the EOP
Partnership, has the same right to allocations and distributions as other
partners of EOP Partnership. In addition, EOP Partnership is obligated to
reimburse the EOP Managing General Partner for all expenses it incurs relating
to its activities as managing general partner, its continued existence and
qualification as a REIT and all other liabilities incurred by the EOP Managing
General Partner in connection with the pursuit of its business and affairs
(including expenses incurred by the EOP Managing General Partner in connection
with the issuance of common shares or other securities of the EOP Managing
General Partner). Except as expressly permitted by EOP Partnership Agreement,
affiliates of EOP will not engage in any transactions with EOP Partnership
except on terms that are fair and reasonable and no less favorable to EOP
Partnership than would be obtained from an unaffiliated third party.
 
SALES OF SUBSTANTIALLY ALL OF THE ASSETS OF EOP PARTNERSHIP
 
     A sale of all or substantially all of the assets of EOP Partnership in a
single transaction or a series of related transactions, including by way of a
merger, consolidation or other combination of EOP Partnership with another
entity, requires (i) the affirmative vote of the holders of a majority of the
outstanding EOP Partnership Units (including EOP Partnership Units held directly
or indirectly by the general partners), if such transaction is in connection
with a similar transaction of the EOP Managing General Partner which has also
been approved by the affirmative vote of the holders of a majority of the
outstanding EOP Partnership Units (including EOP Partnership Units held directly
or indirectly by the general partners) and in connection with which all limited
partners have the right to receive consideration which, on a per unit basis, is
equivalent in value to the consideration to be received by the shareholders of
the EOP Managing General Partner or (ii) in the case of any other such
transaction, the affirmative vote of holders of a majority of the outstanding
EOP Partnership Units held by persons or entities other than the EOP Managing
General Partner and certain of its affiliates.
 
INDEMNIFICATION
 
     EOP Partnership is obligated to indemnify, to the fullest extent provided
by law, any person or entity made a party to a proceeding by reason of its
status as a general partner, a limited partner or a trustee, director or officer
of EOP Partnership or any general partner and such other persons or entities as
the EOP Managing General Partner may designate from time to time in its sole
discretion (an "Indemnitee") from and against any and all losses, claims,
damages, liabilities, joint or several, expenses (including, without limitation,
attorneys fees and other legal fees and expenses), judgments, fines, settlements
and other amounts arising from or in connection with any and all claims,
demands, actions, suits or proceedings, civil, criminal, administrative or
investigative, incurred by the Indemnitee and relating to EOP Partnership or the
general partners or the operation of, or the ownership of property by, any of
them as set forth in the EOP Partnership Agreement in which any such Indemnitee
may be involved, or is threatened to be involved, as a party or otherwise,
unless it is established by a final determination of a court of competent
jurisdiction that: (i) the act or omission of the Indemnitee was material to the
matter giving rise to the proceeding and either was committed in bad faith or
was the result of active and deliberate dishonesty, (ii) the Indemnitee actually
received an improper personal benefit in money, property or services or (iii) in
the case of any criminal proceeding, the Indemnitee had reasonable cause to
believe that the act or omission was unlawful. Any indemnification shall be made
only out of the assets of EOP Partnership, and any insurance proceeds from the
liability policy covering the general partners and any Indemnitee, and neither a
general partner nor any limited partner shall have any obligation to contribute
to the capital of EOP Partnership or otherwise provide funds to enable EOP
Partnership to fund its indemnity obligations. EOP Partnership is obligated to
advance amounts to an Indemnitee for expenses upon receipt of (i) a written
affirmation of the Indemnitee that it believes it has met the standard of
conduct necessary to entitle it to indemnification and (ii) a written
undertaking of the Indemnitee that it will repay any such advances if it shall
be ultimately determined that it did not meet such standard of conduct. The
foregoing indemnification rights are in additions to any other rights afforded
to an
 
                                       160
<PAGE>   169
 
Indemnitee under any other agreement, by vote of the partners, under applicable
law or otherwise, and shall continue as to an Indemnitee who has ceased to serve
in such capacity unless otherwise provided in a written agreement pursuant to
which such Indemnitees are indemnified. EOP Partnership is authorized to
purchase and maintain insurance on behalf of the Indemnitees with respect to the
foregoing matters. EOP Partnership shall be deemed to have requested an
Indemnitee to serve as fiduciary of an employee benefit plan whenever the
performance by it of its duties to EOP Partnership also imposes duties on, or
otherwise involves services by, it to the plan or participants or beneficiaries
of the plan; excise taxes assessed on an Indemnitee with respect to an employee
benefit plan pursuant to applicable law shall constitute fines; and actions
taken or omitted by the Indemnitee with respect to an employee benefit plan in
the performance of its duties for a purpose reasonably believed by it to be in
the interest of the participants and beneficiaries of the plan shall be deemed
to be for a purpose which is not opposed to the best interests of EOP
Partnership. An Indemnitee shall not be denied indemnification in whole or in
part because the Indemnitee had an interest in the transaction with respect to
which the indemnification applies if the transaction was otherwise permitted by
the terms of the EOP Partnership Agreement.
 
TRANSFER OR PLEDGE OF PARTNERSHIP INTERESTS
 
     The EOP Managing General Partner may not transfer any of its partnership
interests (including any of its limited partnership interests) except in
connection with a merger, consolidation or other combination with or into
another Person, sale of all or substantially all of its assets or any
reclassification, recapitalization or change of its outstanding shares and only
if such transaction has been approved by the consent of partners holding at
least a majority of the then outstanding EOP Partnership Units (including any
EOP Partnership Units held by the EOP Managing General Partner and any other
general partner) and in connection with which all limited partners have the
right to receive consideration which, on a per unit basis, is equivalent in
value to the consideration to be received by the holders of corresponding EOP
common shares, nor shall the EOP Managing General Partner withdraw from EOP
Partnership except in connection with such a transaction. A general partner,
other than the EOP Managing General Partner, may not transfer any of its
partnership interests or withdraw as a general partner except in connection with
a transaction described in the foregoing sentence and under other circumstances
specified in the EOP Partnership Agreement.
 
     A limited partner (other than a general partner) may transfer, with or
without the consent of the general partners, all or any portion of such limited
partner's partnership interest, or any of such limited partner's economic rights
as a limited partner, if such transfer does not violate any federal or state
securities laws or regulations applicable to EOP Partnership or the EOP
Partnership Units, does not change the tax status of EOP Partnership or, in the
case of a proposed transfer to a lender of EOP Partnership or any person related
thereto whose loan constitutes a nonrecourse liability, if the EOP Managing
General Partner does not consent to such transfer. No transferee of a limited
partnership interest shall be admitted as a limited partner without the consent
of the EOP Managing General Partner, which may be given or withheld in its sole
and absolute discretion.
 
AMENDMENT OF THE PARTNERSHIP AGREEMENT
 
     Amendments to the EOP Partnership Agreement may be proposed by any general
partners or by limited partners owning at least 25% of the total partnership
interests. Except as described below, the EOP Partnership Agreement may be
amended with the approval of the general partners and limited partners holding a
majority of the partnership interests held by the limited partners (including
limited partners who are general partners). The EOP Managing General Partner has
the power, without the consent of the limited partners, to amend the EOP
Partnership Agreement as may be required (i) to add to the obligations of the
general partners or surrender any right or power granted to the general partners
or any affiliate of a general partner of the benefit of the limited partners,
(ii) to reflect the admission, substitution, termination or withdrawal of
partners in accordance with the EOP Partnership Agreement, (iii) to set forth
the designations, rights, powers, duties and preferences of the holders of any
additional partnership interests issued pursuant to its authority as the
managing general partner, (iv) to reflect a change that does not affect the
limited partners in any material respect, or to cure any ambiguity, correct or
supplement any provision in the EOP Partnership
 
                                       161
<PAGE>   170
 
Agreement not inconsistent with law or with other provisions of the EOP
Partnership Agreement, or make other changes with respect to matters arising
under the EOP Partnership Agreement that will not be inconsistent with law or
with the provisions of the EOP Partnership Agreement and (v) to satisfy any
requirements, conditions or guidelines contained in any order, directive,
opinion, ruling or regulation of a federal, state or local law. Amendments of
provisions regarding, among other things, restrictions imposed on the issuance
of additional EOP Partnership Units or other partnership interests to EOP,
distribution requirements with respect to the EOP Class A Partnership Units in
the event that the EOP Managing General Partner is not publicly traded, the
prohibition against removal of the general partners by the limited partners,
restrictions on the general partners' power to conduct businesses other than
owning partnership interests of EOP Partnership or managing EOP Partnership,
limitations on transactions with affiliates, the liability of the general
partners for monetary damages to EOP Partnership, partnership consent
requirements for the sale of substantially all the assets of EOP Partnership,
the transfer of partnership interests of general partners, the admission and
rights of substituted limited partners or the dissolution of EOP Partnership,
may not be amended without the approval of a majority of the partnership
interests held by limited partners other than EOP or certain of its affiliates.
Any amendment of the provision of the EOP Partnership Agreement which allows the
voluntary dissolution of EOP Partnership prior to December 31, 2046 can be made
only with the approval of 90% of the outstanding partnership interests
(including partnership interests held by the general partners). Amendments to
the EOP Partnership Agreement that would, among other things, (i) convert a
limited partner's interest into a general partner's interest, (ii) modify the
limited liability of a limited partner, (iii) alter the interest of a partner in
profits or losses, or the right to receive any distributions (except as
permitted under the EOP Partnership Agreement with respect to the admission of
new partners or the issuance of additional EOP Partnership Units), or (iv) alter
any redemption right, must be approved by each limited partner that would be
adversely affected by such amendment.
 
MEETINGS
 
     Meetings of the partners may be called by the EOP Managing General Partner
and must be called upon the receipt by EOP of a written request by limited
partners holding 25% or more of the partnership interests. The call shall state
the nature of the business to be transacted. Notice of any such meeting shall be
given to all partners not less than 7 days nor more than 30 days prior to the
date of such meeting. Partners may vote in person or by proxy at such meeting.
Whenever the vote or consent of partners is permitted or required under the EOP
Partnership Agreement, such vote or consent may be given at a meeting of
partners. Except as otherwise expressly provided in the EOP Partnership
Agreement, the consent of holders of a majority of the percentage interests held
by limited partners (including limited partnership interests held by general
partners) shall control.
 
     Any action required or permitted to be taken at a meeting of the partners
may be taken without a meeting if a written consent setting forth the action so
taken is signed by a majority of the percentage interests of the partners (or
such other percentage as is expressly required by the EOP Partnership Agreement.
 
FINANCIAL STATEMENTS AND REPORTS
 
     As soon as practicable, but in no event later than the date on which EOP
mails its annual report to its shareholders, the EOP Managing General Partner
will cause to be mailed to each limited partner an annual report, as of the
close of the most recently ended fiscal year of EOP Partnership, containing
financial statements of EOP Partnership, or of the EOP Managing General Partner
if such statements are prepared solely on a consolidated basis with EOP
Partnership, for such fiscal year, presented in accordance with GAAP and audited
by a nationally recognized firm of independent public accountants selected by
the EOP Managing General Partner. In addition, if and to the extent that the EOP
Managing General Partner mails quarterly reports to its shareholders, as soon as
practicable, but in no event later than the date on which such reports are
mailed, the EOP Managing General Partner shall cause to be mailed to each
limited partner a report containing unaudited financial statements, as of the
last day of such calendar quarter, of EOP Partnership, or of the EOP Managing
General Partner if such statements are prepared solely on a consolidated basis
with
 
                                       162
<PAGE>   171
 
EOP Partnership, and such other information as may be required by applicable law
or regulation, or as the EOP Managing General Partner determines to be
appropriate.
 
TERM
 
     EOP Partnership will be dissolved and its affairs wound up upon the
earliest of (i) December 31, 2095; (ii) the withdrawal of the EOP Managing
General Partner and the absence of remaining general partners or a duly
appointed successor general partner; (iii) the sale of all or substantially all
of the EOP Partnership's assets and properties; (iv) the entry of a decree of
judicial dissolution of the EOP Partnership pursuant to the provisions of the
Partnership Act; (v) the entry of a final non-appealable judgment ruling that
the last remaining general partner is bankrupt or insolvent (except that, in
either such case, in certain circumstances the limited partners (other than the
EOP Managing General Partner) may vote to continue the EOP Partnership and
substitute a new general partner in place of EOP); (vi) prior to January 1,
2046, with the consent of holders (including the EOP Managing General Partner)
of 90% of the outstanding EOP Partnership Units; or (vii) on or after January 1,
2046, on election by the EOP Managing General Partner, in its sole and absolute
discretion.
 
                       COMPARATIVE RIGHTS OF UNITHOLDERS
 
     At the Effective Time, holders of Beacon Partnership Units automatically
would become holders of EOP Partnership Units and their rights as partners would
be determined by the EOP Partnership Agreement. The following is a summary of
the material differences in the rights of partners of EOP Partnership and
partners of Beacon Partnership. This summary does not purport to be complete and
is subject to and qualified in its entirety by reference to the EOP Partnership
Agreement and the Beacon Partnership Agreement.
 
CAPITALIZATION
 
     EOP.  As of the date of this Proxy Statement/Prospectus, there are
175,795,840 Class A units of partnership interest of EOP Partnership ("EOP Class
A Partnership Units") issued and outstanding and 3,399,977 Class B units of
partnership interest of EOP Partnership ("EOP Class B Partnership Units,"
together with the EOP Class A Partnership Units, the "EOP Partnership Units")
issued and outstanding, all of which are fully paid and nonassessable. Prior to
the Effective Time, the managing general partner of EOP Partnership (the "EOP
Managing General Partner") will take such actions as shall be necessary to cause
EOP Partnership to issue 8,000,000 8.98% Series A preferred units of partnership
interest of EOP having the rights, preferences and other privileges, variations
and designations described in this Proxy Statement/Prospectus ("EOP Series A
Preferred Partnership Units") in the Partnership Merger in exchange for the
outstanding Beacon Series A Preferred Partnership Units (as defined below). All
of the EOP Class A Partnership Units and the EOP Series A Preferred Partnership
Units to be issued in the Partnership Merger will be fully paid and
nonassessable and all of such EOP Series A Preferred Partnership Units will be
held by EOP as the EOP Managing General Partner.
 
     BEACON.  As of the date of this Proxy Statement/Prospectus, there are
63,156,724 units of partnership interest of Beacon Partnership ("Beacon
Partnership Units") and 8,000,000 8.98% Series A preferred units of partnership
of Beacon having the rights, preferences and other privileges, variations and
designations described in this Proxy Statement/Prospectus ("Beacon Series A
Preferred Partnership Units") issued and outstanding, all of which are fully
paid and nonassessable. All of the Beacon Series A Preferred Partnership Units
are held by Beacon.
 
ISSUANCE OF ADDITIONAL PARTNERSHIP INTERESTS
 
     EOP.  The EOP Managing General Partner is authorized to cause EOP
Partnership from time to time to issue to partners of EOP (including the EOP
Managing General Partner and its affiliates) or other persons or entities EOP
Partnership Units or other partnership interests of EOP Partnership in one or
more classes, or in one or more series of any of such classes, with such
designations, preferences and relative, participating, optional or other special
rights, powers and duties (which may be senior to those of the EOP Partnership
 
                                       163
<PAGE>   172
 
Units), as shall be determined by the EOP Managing General Partner in its sole
and absolute discretion, provided that, no such EOP Partnership Units or other
partnership interests shall be issued to the EOP Managing General Partner unless
either (i) such EOP Partnership Units or other partnership interests are issued
in connection with the grant, award or issuance of shares or other equity
interests in the EOP Managing General Partner having designations, preferences
and other rights such that the economic interests attributable to such shares or
other equity interests are substantially similar to the designations,
preferences and other rights of such EOP Partnership Units or other partnership
interests, respectively, issued to the EOP Managing General Partner and the EOP
Managing General Partner contributes to EOP Partnership the proceeds of such
shares or other equity interests received by the EOP Managing General Partner or
(ii) the additional EOP Partnership Units or other partnership interests are
issued to all partners holding EOP Partnership Units or other partnership
interests in the same class, respectively, in proportion to their respective
percentage interests in such EOP Partnership Units or class, as the case may be.
 
     At the election of the EOP Managing General Partner, in its sole and
absolute discretion, either EOP Class A Partnership Units or EOP Class B
Partnership Units may be issued to newly admitted partners, provided that, any
EOP Partnership Unit that is not specifically designated by the EOP Managing
General Partner as being of a particular class shall be deemed to be an EOP
Class A Partnership Unit. Only EOP Series A Preferred Partnership Units shall be
issued in the Partnership Merger in exchange of Beacon Series A Preferred
Partnership Units.
 
     BEACON.  The general partner of Beacon Partnership (the "Beacon General
Partner") is authorized to cause Beacon Partnership from time to time to issue
to the partners (including the General Partner) or other persons or entities
additional Beacon Partnership Units or other partnership interests in one or
more classes, or one or more series of any of such classes, with such
designations, preferences and relative, participating, optional or other special
rights, powers and duties (which may be senior to the Beacon Partnership Units),
as shall be determined by the Beacon General Partner in its sole and absolute
discretion, provided that no such additional Beacon Partnership Units or other
partnership interests shall be issued to Beacon, as the Beacon General Partner
or as a limited partner of Beacon Partnership, unless either (i) the additional
Beacon Partnership Units or other partnership interests are issued in connection
with an issuance of Beacon Common Shares or other shares by Beacon, which shares
have designations, preferences and other rights such that the economic interests
attributable to such shares are substantially similar to the designations,
preferences and other rights of the other partnership interests issued to
Beacon, respectively, and Beacon shall make a capital contribution to Beacon
Partnership in an amount equal to the proceeds raised in connection with such
issuance, or (ii) the additional Beacon Partnership Units or other partnership
interests are issued to all partners holding Beacon Partnership Units or other
partnership interests in the same class, respectively, in proportion to their
respective percentage interests in such Beacon Partnership Units or class, as
the case may be. In addition, Beacon may acquire Beacon Partnership Units or
other partnership interests from other partners pursuant to the Beacon
Partnership Agreement.
 
CAPITAL CONTRIBUTIONS
 
     EOP.  No partner of EOP Partnership will be required to make additional
capital contributions to EOP Partnership, except that the Managing General
Partner is generally required to contribute net proceeds of the sale of equity
interests in the Managing General Partner to EOP Partnership in exchange for
additional Partnership Units. No limited or general partner receiving EOP
Partnership Units in the Partnership Merger will be required to pay to the EOP
Partnership any deficit or negative balance which may exist in its capital
account.
 
     BEACON.  No partner of Beacon Partnership will be required to make
additional capital contributions to Beacon Partnership, except that Beacon is
generally required to contribute net proceeds of the sale of equity interests in
Beacon to Beacon Partnership.
 
                                       164
<PAGE>   173
 
DISTRIBUTIONS
 
     EOP.  The EOP Partnership Agreement requires the distribution, on a
quarterly or shorter basis (a "Distribution Period"), of "Available Cash" (as
defined below), (i) first, to the Managing General Partner of an amount that in
the aggregate equals the amount of the dividends declared and payable with
respect to the EOP Preferred Shares for such Distribution Period and (ii)
second, to the partners of EOP Partnership in proportion to their percentage
interests in EOP Partnership (other than such interests represented by their EOP
Series A Preferred Partnership Units) which, for any partner, is determined,
except as described below, by the number of EOP Partnership Units it owns
relative to the total number of EOP Partnership Units outstanding. "Available
Cash" is generally defined as net cash flow from operations plus any reduction
in reserves and minus interest and principal payments on debt, capital
expenditures, any additions to reserves and other adjustments.
 
     In the event that both EOP Class A Partnership Units and EOP Class B
Partnership Units are outstanding on the record date for a Distribution Period,
the Available Cash for such Distribution Period shall be allocated between the
EOP Class A Partnership Units and the EOP Class B Partnership Units, as well as
among any groups of EOP Class B Partnership Units which were outstanding for
different amounts of time during the Distribution Period, based on the total
number of days during such Distribution Period that each such class and or group
of units were outstanding. The portion of the Available Cash thus allocated
shall, in turn, be allocated among the holders of the applicable units in
proportion to their percentage interests in EOP Partnership as described above.
In no event may a partner receive a distribution of Available Cash with respect
to an EOP Class A Partnership Unit if such partner is entitled to receive a
distribution out of such Available Cash with respect to an EOP Common Share for
which such EOP Class A Partnership Unit has been redeemed or exchange. In no
event may a partner receive a distribution of Available Cash with respect to any
EOP Class B Partnership Unit for any Distribution Period ending prior to the
date on which such EOP Class B Partnership Unit was issued. Notwithstanding
anything to the contrary above, EOP Partnership must distribute to the Managing
General Partner an amount equal to the aggregate amount necessary to redeem any
EOP Preferred Shares which have been called for redemption by EOP. Such
distribution shall be made in redemption of a number of EOP Preferred Units
equal to the number of EOP Preferred Shares to be redeemed with the funds to be
distributed.
 
     BEACON.  The Beacon Partnership Agreement requires the distribution with
respect to each Distribution Period of Available Cash, (i) first, to Beacon of
an amount that in the aggregate equals the amount of the dividends declared and
payable with respect to the Beacon Preferred Shares for such Distribution Period
and (ii) second, to the partners of Beacon Partnership in proportion to their
percentage interests in Beacon Partnership (other than such interests
represented by their Beacon Series A Preferred Partnership Units) which, for any
partner, is determined, except as described below, by the number of Beacon
Partnership Units it owns relative to the total number of Beacon Partnership
Units outstanding, provided that, in no event may a partner receive a
distribution of Available Cash with respect to an Beacon Partnership Unit if
such partner is entitled to receive a distribution out of such Available Cash
with respect to a Beacon Common Share for which such Beacon Partnership Unit has
been redeemed or exchanged. Notwithstanding any of the foregoing to the
contrary, Beacon Partnership must distribute to Beacon an amount equal to the
aggregate amount necessary to redeem any Beacon Preferred Shares which have been
called for redemption by Beacon. Such distribution shall be made in redemption
of a number of Beacon Preferred Units equal to the number of Beacon Preferred
Shares to be redeemed with the funds to be distributed.
 
PREEMPTIVE RIGHTS
 
     EOP.  Except to the extent expressly granted by EOP Partnership pursuant to
an agreement other than the EOP Partnership Agreement, no person or entity,
including without limitation any partner of EOP Partnership, has any preemptive,
preferential or other similar right with respect to (i) additional capital
contributions or loans to EOP Partnership or (ii) the issuance or sale of any
EOP Partnership Units or other partnership interests of EOP Partnership.
 
                                       165
<PAGE>   174
 
     BEACON.  In connection with any capital contribution made to Beacon
Partnership by Beacon in respect of any partnership interests required to be
issued to Beacon as a result of the issuance by Beacon of any equity interests
or any rights to acquire such equity interests, the limited partners other than
Beacon shall have the right to contribute to Beacon Partnership a portion of
such capital contribution equal to or less than their then-existing percentage
interest in Beacon Partnership. Beacon must notify each limited partner of its
intent to make such capital contribution and the amount thereof and the limited
partners must notify Beacon Partnership of their intent to make a capital
contribution, and the amount thereof, within five business days of receipt of
such notice from Beacon. Except for the foregoing, no partner has any
preemptive, preferential or other similar right with respect to (i) additional
capital contributions or loans to Beacon Partnership or (ii) the issuance or
sale of Beacon Partnership Units or other partnership interests.
 
CONVERSION; REDEMPTION
 
     EOP.  Each EOP Class B Partnership Unit will be converted automatically
into an EOP Class A Partnership Unit on the day immediately following the record
date for the Distribution Period during which such EOP Class B Partnership Unit
was issued.
 
     Subject to certain limitations described below, each limited partner other
than the EOP Managing General Partner and certain of its affiliates has the
right to require the redemption of its EOP Partnership Units at any time or from
time to time beginning on the first anniversary (or, in the case of certain
investors specified in the EOP Partnership Agreement, the second anniversary) of
the issuance of such EOP Partnership Units to it or, in the case of any or all
EOP Class A Partnership Units held by it, on or after such earlier date as the
EOP Managing General Partner designates in its sole and absolute discretion (the
"Unit Redemption Right"). With respect to any EOP Partnership Units to be issued
in the Partnership Merger in exchange for Beacon Partnership Units, the
foregoing holding period shall be deemed to commence on the date of issuance of
the Beacon Partnership Units to the limited partners holding of such EOP
Partnership Units. In addition, each limited partner may exercise its Unit
Redemption Right, regardless of the length of time it has held its EOP
Partnership Units, during the period commencing on the date the EOP Managing
General Partner has given the limited partners notice of its intention to make
an extraordinary distribution of cash or property to its shareholders or effect
a merger, a sale of all or substantially all of its assets or any other similar
extraordinary transaction and ending on the record date to determine
shareholders eligible to receive such distribution or to vote upon the approval
of such merger, sale or other extraordinary transaction (or, if no such record
date is applicable, at least 20 business days before the consummation of such
merger, sale or other extraordinary transaction). A limited partner may exercise
its Unit Redemption Right by giving written notice thereof to EOP Partnership
and the EOP Managing General Partner. The EOP Partnership Units specified in
such notice shall be redeemed on the 10th business date following the date on
which the EOP Managing General Partner received the redemption notice or, in the
case of a the exercise of a Unit Redemption Right in connection with an
extraordinary transaction, the date on which EOP Partnership and the EOP
Managing Partner received the redemption notice.
 
     Unless the EOP Managing General Partner elects to assume and perform EOP
Partnership's obligation with respect to a Unit Redemption Right, as described
below, a limited partner which exercises its Unit Redemption Right will receive
cash from EOP Partnership in an amount equal to the market value of the EOP
Partnership Units to be redeemed. The market value of an EOP Partnership Unit
for this purpose will be equal to the average of the closing trading price of an
EOP Common Share on the NYSE for the ten trading days before the day on which
the redemption notice was given. In lieu of EOP Partnership's acquiring the EOP
Partnership Units for cash, the EOP Managing General Partner has the right to
elect to acquire on the redemption date the EOP Partnership Units directly from
a limited partner exercising the Unit Redemption Right, in exchange for cash in
the amount specified above or by issuance of a number of EOP Common Shares equal
to the number of EOP Partnership Units offered for redemption adjusted as
specified in the EOP Partnership Agreement to take into account prior share
dividends or subdivision or combinations of EOP Common Shares. Upon exercise of
the Unit Redemption Right, the limited partner's right to receive distributions
of the EOP Partnership Units so redeemed or exchanged will cease. At least 1,000
EOP Partnership Units (or all remaining EOP Partnership Units owned by the
limited partner if less than 1,000
 
                                       166
<PAGE>   175
 
units) must be redeemed each time the Unit Redemption Right is exercised. No
redemption or exchange can occur if delivery of common shares therefor would be
prohibited either under the provision of EOP's Declaration of Trust or under
applicable federal or state securities laws, regardless of whether the EOP
Managing Partner would in fact assume and satisfy the Unit Redemption Right. EOP
will at times reserve and keep available out of its authorized but unissued EOP
Common Shares, solely for the purpose of effecting the issuance of EOP Common
Shares pursuant to the Unit Redemption Right, a sufficient number of EOP Common
Shares as shall from time to time be sufficient for the redemption of all
outstanding EOP Partnership Units not owned by EOP.
 
     In the event any EOP Preferred Shares have been called for redemption a
number of EOP Preferred Units equal to the number of EOP Preferred Shares called
for redemption shall be redeemed. Such redemption shall be effectuated at such
time and in such manner as to allow the redemption of EOP Preferred Shares to be
completed in a timely fashion in accordance with the requirements applicable
thereto.
 
     BEACON.  Each limited partner other than Beacon will have the right (the
"Redemption Right") to require Beacon Partnership, except as described below, to
redeem for cash, on the tenth business day following Beacon's receipt of a
notice of redemption, all or a portion of the Beacon Partnership Units held by
such limited partner at a redemption price per unit equal to the average of the
closing trading price of a Beacon Common Share on the NYSE for the ten trading
days before the day on which the redemption notice was given. The Redemption
Right shall be exercised pursuant to a notice of redemption delivered to Beacon
Partnership and Beacon by the limited partner who is exercising the redemption
right (the "Redeeming Partner"). A limited partner may not exercise the
Redemption Right for less than 1,000 Beacon Partnership Units or, if such
limited partner holds fewer than 1,000 Beacon Partnership Units, all of the
Beacon Partnership Units held by such limited partner. The Redeeming Partner
shall have no right, with respect to any Beacon Partnership Units redeemed, to
receive any distributions paid on or after the redemption date.
 
     A Limited Partner that exercises the Redemption Right will be deemed to
have offered to sell to Beacon the Beacon Partnership Units described in the
notice of redemption. Beacon may, in its sole and absolute discretion, elect to
purchase directly and acquire such Beacon Partnership Units on the redemption
date, for cash in the amount specified above or by issuance of a number of
Beacon Common Shares equal to the number of Beacon Partnership Units offered for
redemption adjusted as specified in the Beacon Partnership Agreement to take
into account prior share dividends or subdivision or combinations of Beacon
Common Shares. Beacon may exercise its right by giving the Redeeming Partner
notice thereof within 5 business days after the receipt by it of the notice of
redemption. Each of the Redeeming Partner, Beacon Partnership, and Beacon shall
treat any transaction between Beacon and the Redeeming Partner, for federal
income tax purposes, as a sale of the Redeeming Partner's Beacon Partnership
Units to Beacon.
 
     In the event any Beacon Preferred Shares have been called for redemption a
number of Beacon Preferred Units equal to the number of Beacon Preferred Shares
called for redemption shall be redeemed. Such redemption shall be effectuated at
such time and in such manner as to allow the redemption of Beacon Preferred
Shares to be completed in a timely fashion in accordance with the requirements
applicable thereto.
 
MANAGEMENT
 
     EOP.  Except as otherwise expressly provided in the EOP Partnership
Agreement, all management powers over the business and affairs of EOP
Partnership are exclusively vested in the general partners and no limited
partner has any right to participate in or exercise control or management power
over the business and affairs of EOP Partnership or has the power to sign
documents for or otherwise bind EOP Partnership. The EOP Managing General
Partner has full power and authority to do all things it deems necessary or
desirable to conduct the business of EOP Partnership, subject to the consent of
the limited partners in certain limited circumstances. In particular, the EOP
Managing General Partner is under no obligation to consider the tax consequences
to limited partners when making decisions for the benefit of EOP Partnership.
The limited partners have no power to remove the general partners.
 
     BEACON.  Except as otherwise expressly provided in the Beacon Partnership
Agreement, all management powers over the business and affairs of Beacon
Partnership are exclusively vested in the Beacon General
 
                                       167
<PAGE>   176
 
Partner and no limited partner has any right to participate in or exercise
control or management power over the business and affairs of Beacon Partnership
or has the power to sign documents for or otherwise bind Beacon Partnership. The
Beacon General Partner has full power and authority to do all things it deems
necessary or desirable to conduct the business of Beacon Partnership, subject to
the consent of the limited partners in certain limited circumstances. In
particular, the Beacon General Partner is under no obligation to consider the
tax consequences to limited partners when making decisions for the benefit of
Beacon Partnership. The limited partners have no power to remove the general
partners.
 
SALE OF SUBSTANTIALLY ALL OF PARTNERSHIP ASSETS
 
     EOP.  A sale of all or substantially all of the assets of EOP Partnership
in a single transaction or a series of related transactions, including by way of
a merger, consolidation or other combination of EOP Partnership with another
entity, requires (i) the affirmative vote of the holders of a majority of the
outstanding EOP Partnership Units (including EOP Partnership Units held directly
or indirectly by the general partners), if such transaction is in connection
with a similar transaction of the EOP Managing General Partner which has also
been approved by the affirmative vote of the holders of a majority of the
outstanding EOP Partnership Units (including EOP Partnership Units held directly
or indirectly by the general partners) and in connection with which all limited
partners have the right to receive consideration which, on a per unit basis, is
equivalent in value to the consideration to be received by the shareholders of
the EOP Managing General Partner or (ii) in the case of any other such
transaction, the affirmative vote of holders of a majority of the outstanding
EOP Partnership Units held by persons or entities other than the EOP Managing
General Partner and certain of its affiliates.
 
     BEACON.  A sale of all or substantially all of the assets of EOP
Partnership in a single transaction or a series of related transactions,
including by way of a merger, consolidation or other combination of Beacon
Partnership with another entity, requires the consent of limited partners
holding 85% or more of the total percentage interests of the limited partners
(including the limited partner interests held by Beacon).
 
INDEMNIFICATION
 
     EOP.  EOP Partnership is obligated to indemnify, to the fullest extent
provided by law, any person or entity made a party to a proceeding by reason of
its status as a general partner, a limited partner or a trustee, director or
officer of EOP Partnership or EOP Partnership and such other persons or entities
as the EOP Managing Partner may designate from time to time in its sole
discretion (an "Indemnitee") from and against any and all losses, claims,
damages, liabilities, joint or several, expenses (including, without limitation,
attorneys fees and other legal fees and expenses), judgments, fines, settlements
and other amounts arising from or in connection with any and all claims,
demands, actions, suits or proceedings, civil, criminal, administrative or
investigative, incurred by the Indemnitee and relating to EOP Partnership or the
general partners or the operation of, or the ownership of property by, any of
them as set forth in the EOP Partnership Agreement in which any such Indemnitee
may be involved, or is threatened to be involved, as a party or otherwise,
unless it is established by a final determination of a court of competent
jurisdiction that: (i) the act or omission of the Indemnitee was material to the
matter giving rise to the proceeding and either was committed in bad faith or
was the result of active and deliberate dishonesty, (ii) the Indemnitee actually
received an improper personal benefit in money, property or services or (iii) in
the case of any criminal proceeding, the Indemnitee had reasonable cause to
believe that the act or omission was unlawful. Any indemnification shall be made
only out of the assets of EOP Partnership, and any insurance proceeds from the
liability policy covering the general partners and any Indemnitee, and neither a
general partner nor any limited partner shall have any obligation to contribute
to the capital of EOP Partnership or otherwise provide funds to enable EOP
Partnership to fund its indemnity obligations. EOP is obligated to advance
amounts to an Indemnitee for expenses upon receipt of (i) a written affirmation
of the Indemnitee that it believes it has met the standard of conduct necessary
to entitle it to indemnification and (ii) a written undertaking of the
Indemnitee that it will repay any such advances if it shall be ultimately
determined that it did not meet such standard of conduct. The foregoing
indemnification rights are in additions to any other rights afforded to an
Indemnitee under any other agreement, by vote of the partners, under applicable
law or otherwise, and shall
 
                                       168
<PAGE>   177
 
continue as to an Indemnitee who has ceased to serve in such capacity unless
otherwise provided in a written agreement pursuant to which such Indemnitees are
indemnified. EOP Partnership is authorized to purchase and maintain insurance on
behalf of the Indemnitees with respect to the foregoing matters. EOP Partnership
shall be deemed to have requested an Indemnitee to serve as fiduciary of an
employee benefit plan whenever the performance by it of its duties to EOP
Partnership also imposes duties on, or otherwise involves services by, it to the
plan or participants or beneficiaries of the plan; excise taxes assessed on an
Indemnitee with respect to an employee benefit plan pursuant to applicable law
shall constitute fines; and actions taken or omitted by the Indemnitee with
respect to an employee benefit plan in the performance of its duties for a
purpose reasonably believed by it to be in the interest of the participants and
beneficiaries of the plan shall be deemed to be for a purpose which is not
opposed to the best interests of EOP Partnership. An Indemnitee shall not be
denied indemnification in whole or in part because the Indemnitee had an
interest in the transaction with respect to which the indemnification applies if
the transaction was otherwise permitted by the terms of the EOP Partnership
Agreement.
 
     BEACON.  Beacon Partnership is obligated to indemnify, to the fullest
extent provided by law, each Indemnitee from and against any and all losses,
claims, damages, liabilities, joint or several, expenses (including, without
limitation, attorneys fees and other legal fees and expenses), judgments, fines,
settlements and other amounts arising from or in connection with any and all
claims, demands, actions, suits or proceedings, civil, criminal, administrative
or investigative, incurred by the Indemnitee and relating to Beacon Partnership
or the general partners or the operation of, or the ownership of property by,
any of them as set forth in the Beacon Partnership Agreement in which any such
Indemnitee may be involved, or is threatened to be involved, as a party or
otherwise, unless it is established by a final determination of a court of
competent jurisdiction that: (i) the act or omission of the Indemnitee was
material to the matter giving rise to the proceeding and either was committed in
bad faith or was the result of active and deliberate dishonesty, (ii) the
Indemnitee actually received an improper personal benefit in money, property or
services or (iii) in the case of any criminal proceeding, the Indemnitee had
reasonable cause to believe that the act or omission was unlawful. Any
indemnification shall be made only out of the assets of Beacon Partnership, and
any insurance proceeds from the liability policy covering the general partners
and any Indemnitee, and neither a general partner nor any limited partner shall
have any obligation to contribute to the capital of Beacon Partnership or
otherwise provide funds to enable Beacon Partnership to fund its indemnity
obligations. Beacon is obligated to advance amounts to an Indemnitee for
expenses upon receipt of (i) a written affirmation of the Indemnitee that it
believes it has met the standard of conduct necessary to entitle it to
indemnification and (ii) a written undertaking of the Indemnitee that it will
repay any such advances if it shall be ultimately determined that it did not
meet such standard of conduct. The foregoing indemnification rights are in
additions to any other rights afforded to an Indemnitee under any other
agreement, by vote of the partners, under applicable law or otherwise, and shall
continue as to an Indemnitee who has ceased to serve in such capacity unless
otherwise provided in a written agreement pursuant to which such Indemnitees are
indemnified. Beacon Partnership is authorized to purchase and maintain insurance
on behalf of the Indemnitees with respect to the foregoing matters. Beacon
Partnership shall be deemed to have requested an Indemnitee to serve as
fiduciary of an employee benefit plan whenever the performance by it of its
duties to Beacon Partnership also imposes duties on, or otherwise involves
services by, it to the plan or participants or beneficiaries of the plan; excise
taxes assessed on an Indemnitee with respect to an employee benefit plan
pursuant to applicable law shall constitute fines; and actions taken or omitted
by the Indemnitee with respect to an employee benefit plan in the performance of
its duties for a purpose reasonably believed by it to be in the interest of the
participants and beneficiaries of the plan shall be deemed to be for a purpose
which is not opposed to the best interests of Beacon Partnership. An Indemnitee
shall not be denied indemnification in whole or in part because the Indemnitee
had an interest in the transaction with respect to which the indemnification
applies if the transaction was otherwise permitted by the terms of the Beacon
Partnership Agreement.
 
TRANSFER OR PLEDGE OF UNITS
 
     EOP.  The EOP Managing General Partner may not transfer any of its
partnership interests (including any of its limited partnership interests)
except in connection with a merger, consolidation or other combination with or
into another person, sale of all or substantially all of its assets or any
reclassification,
 
                                       169
<PAGE>   178
 
recapitalization or change of its outstanding shares and only if such
transaction has been approved by the consent of the partners holding at least a
majority of the then outstanding EOP Partnership Units (including any EOP
Partnership Units held by the general partners) and in connection with which all
limited partners have the right to receive consideration which, on a per unit
basis, is equivalent in value to the consideration to be received by the
shareholders of the EOP Managing General Partner, nor shall the EOP Managing
General Partnership withdraw from EOP Partnership except in connection with such
a transaction. A general partner, other than the EOP Managing General Partner,
may not transfer any of its partnership interests or withdraw as a general
partner except in connection with a transaction described in the foregoing
sentence and under other circumstances specified in the EOP Partnership
Agreement.
 
     A limited partner (other than a general partner) may transfer, with or
without the consent of the general partners, all or any portion of its
partnership interest, or any of such limited partner's economic rights as a
limited partner, if such transfer does not violate any federal or state
securities laws or regulations applicable to EOP Partnership or the EOP
Partnership Units, does not change the tax status of EOP Partnership or, in the
case of a proposed transfer to a lender of EOP Partnership or any person related
thereto whose loan constitutes a nonrecourse liability, if the EOP Managing
General Partner does not consent to such transfer. No transferee of a limited
partnership interest shall admitted as a limited partner without the consent of
the EOP Managing General Partner which may be given or withheld in its sole and
absolute discretion.
 
     BEACON.  Beacon may not transfer any of its general partner interest or
withdraw as the Beacon General Partner or transfer any of its limited partner
interest unless limited partners holding a majority of the percentage interests
of the limited partners (other than limited partner interests held by Beacon)
consent to such transfer or withdrawal or such transfer is to an entity which is
wholly-owned by Beacon and is a Qualified REIT Subsidiary under Section 856(i)
of the Code.
 
     A limited partner (other than Beacon) may transfer, with or without the
consent of the Beacon General Partner, all or any portion of its partnership
interest, or any of such limited partner's economic rights as a limited partner,
if such transfer does not violate any federal or state securities laws or
regulations applicable to Beacon Partnership or the Beacon Partnership Units,
does not change the tax status of Beacon Partnership or, in the case of a
proposed transfer to a lender of Beacon Partnership or any person related
thereto whose loan constitutes a nonrecourse liability, if the Beacon General
Partner does not consent to such transfer. No transferee of a limited
partnership interest shall admitted as a limited partner without the consent of
the Beacon General Partner which may be given or withheld in its sole and
absolute discretion.
 
AMENDMENT OF PARTNERSHIP AGREEMENT
 
     EOP.  Amendments to the EOP Partnership Agreement may be proposed by any
general partners or by limited partners owning at least 25% of the total
partnership interests. Except as described below, the EOP Partnership Agreement
may be amended with the approval of the general partners and limited partners
holding a majority of the partnership interests held by the limited partners
(including limited partners who are general partners). The EOP Managing General
Partner has the power, without the consent of the limited partners, to amend the
EOP Partnership Agreement as may be required (i) to add to the obligations of
the general partners or surrender any right or power granted to the general
partners or any affiliate of a general partner of the benefit of the limited
partners, (ii) to reflect the admission, substitution, termination or withdrawal
of partners in accordance with the EOP Partnership Agreement, (iii) to set forth
the designations, rights, powers, duties and preferences of the holders of any
additional partnership interests issued pursuant to the authority of the EOP
Managing General Partner, (iv) to reflect a change that does not affect the
limited partners in any material respect, or to cure any ambiguity, correct or
supplement any provision in the EOP Partnership Agreement not inconsistent with
law or with other provisions of the EOP Partnership Agreement, or make other
changes with respect to matters arising under the EOP Partnership Agreement that
will not be inconsistent with law or with the provisions of the EOP Partnership
Agreement and (v) to satisfy any requirements, conditions or guidelines
contained in any order, directive, opinion, ruling or regulation of a federal,
state or local law. Amendments of provisions regarding, among other things,
restrictions imposed on the issuance of additional EOP Partnership Units or
other partnership interests to the EOP Managing General Partner, distribution
requirements with respect to the EOP Class A Partnership Units in the event the
EOP
 
                                       170
<PAGE>   179
 
Managing General Partner is not publicly traded, the prohibition against removal
of the general partners by the limited partners, restrictions on the general
partners' power to conduct businesses other than owning partnership interests of
EOP Partnership or managing EOP Partnership, limitations on transactions with
affiliates, the liability of the general partners for monetary damages to EOP
Partnership, partnership consent requirements for the sale of substantially all
the assets of EOP Partnership, the transfer of partnership interests of general
partners, the admission and rights of substituted limited partners or the
dissolution of EOP Partnership, may not be amended without the approval of a
majority of the partnership interests held by limited partners other than the
EOP Managing General Partner or certain of its affiliates. Any amendment of the
provision of the EOP Partnership Agreement which allows the voluntary
dissolution of EOP Partnership prior to December 31, 2046 can be made only with
the approval of 90% of the outstanding partnership interests (including
partnership interests held by the general partners). Amendments to the EOP
Partnership Agreement that would, among other things, (i) convert a limited
partner's interest into a general partner's interest, (ii) modify the limited
liability of a limited partner, (iii) alter the interest of a partner in profits
or losses, or the right to receive any distributions (except as permitted under
the EOP Partnership Agreement with respect to the admission of new partners or
the issuance of additional EOP Partnership Units), or (iv) alter any redemption
right, must be approved by each limited partner that would be adversely affected
by such amendment.
 
     BEACON.  Amendments to the Beacon Partnership Agreement may be proposed by
the Beacon General Partner or by any limited partners (other than Beacon)
holding 20% or more of the partnership interests. Except as described below, a
proposed amendment shall be adopted and be effective as an amendment if it is
approved by the Beacon General Partner and it receives the consent of partners
holding a majority of the percentage interests of the limited partners
(including or excluding limited partner interests held by Beacon, depending upon
the nature of the proposed amendment). The Beacon General Partner shall have the
power, without the consent of the Limited Partners, but with notice to the
Limited Partners, to amend the Partnership Agreement as may be required to
facilitate or implement certain purposes, including, among other things, adding
to the obligations of the General Partner or surrendering any right or power
granted to the General Partner or any Affiliate of the General Partner for the
benefit of the Limited Partners, reflecting the admission, substitution,
termination, or withdrawal of Partners in accordance with the Partnership
Agreement, and setting forth the designations, rights, powers, duties, and
preferences of the holders of any additional Partnership Interests. The
Partnership Agreement shall not be amended without the Consent of each Partner
adversely affected if such amendment would (i) convert a limited partner's
interest into a general partner's interest, (ii) modify the limited liability of
a limited partner, (iii) alter the interest of a partner in profits or losses,
or the right to receive any distributions (except as permitted under the
Partnership Agreement with respect to the admission of new partners or the
issuance of additional Units), or (iv) alter the Unit Redemption Right and REIT
Shares Amount.
 
MEETINGS
 
     EOP.  Meetings of the partners may be called by the EOP Managing General
Partner and shall be called upon the receipt by the EOP Managing General Partner
of a written request by limited partners holding 25% or more of the partnership
interests. The call shall state the nature of the business to be transacted.
Notice of any such meeting shall be given to all partners not less than seven
days nor more than 30 days prior to the date of such meeting. Partners may vote
in person or by proxy at such meeting. Whenever the vote or consent of partners
is permitted or required under the EOP Partnership Agreement, such vote or
consent may be given at a meeting of partners. Except as otherwise expressly
provided in the EOP Partnership Agreement, the consent of holders of a majority
of the percentage interests held by limited partners (including limited
partnership interests held by general partners) shall control.
 
     Any action required or permitted to be taken at a meeting of the partners
may be taken without a meeting if a written consent setting forth the action so
taken is signed by a majority of the percentage interests of the partners (or
such other percentage as is expressly required by the EOP Partnership Agreement.
 
     BEACON.  Meetings of the partners may be called by the Beacon General
Partner and shall be called upon the receipt by the Beacon General Partner of a
written request by limited partners (other than Beacon)
 
                                       171
<PAGE>   180
 
holding 20% or more of the partnership interests. The request shall state the
nature of the business to be transacted. Notice of any such meeting shall be
given to all partners not less than seven days nor more than 30 days prior to
the date of such meeting. Partners may vote in person or by proxy at such
meeting. Whenever the vote or consent of partners is permitted or required under
the Beacon Partnership Agreement, such vote or consent may be given at a meeting
of partners. Except as otherwise expressly provided in the Beacon Partnership
Agreement, the consent of holders of a majority of the percentage interests held
by limited partners (including limited partnership interests held by Beacon)
shall control.
 
     Any action required or permitted to be taken at a meeting of the partners
may be taken without a meeting if a written consent setting forth the action so
taken is signed by a majority of the percentage interests of the partners (or
such other percentage as is expressly required by the Beacon Partnership
Agreement).
 
FINANCIAL STATEMENTS AND REPORTS
 
     EOP.  As soon as practicable, but in no event later than the date on which
the EOP Managing General Partner mails its annual report to its shareholders,
the EOP Managing General Partner shall cause to be mailed to each limited
partner an annual report, as of the close of the most recently ended fiscal year
of EOP Partnership, containing financial statements of EOP Partnership, or of
the EOP Managing General Partner if such statements are prepared solely on a
consolidated basis with EOP Partnership, for such fiscal year, presented in
accordance with generally accepted accounting principles and audited by a
nationally recognized firm of independent public accountants selected by the EOP
Managing General Partner. In addition, if and to the extent that the EOP
Managing General Partner mails quarterly reports to its shareholders, as soon as
practicable, but in no event later than the date on which such reports are
mailed, the EOP Managing General Partner shall cause to be mailed to each
limited partner a report containing unaudited financial statements, as of the
last day of such calendar quarter, of EOP Partnership, or of the EOP Managing
General Partner if such statements are prepared solely on a consolidated basis
with EOP Partnership, and such other information as may be required by
applicable law or regulation, or as the EOP Managing General Partner determines
to be appropriate.
 
     BEACON.  As soon as practicable, but in no event later than 105 days after
the close of each fiscal year of Beacon Partnership, the Beacon General Partner
shall cause to be mailed to each limited partner an annual report, as of the
close of such fiscal year, containing financial statements of Beacon
Partnership, or of Beacon if such statements are prepared solely on a
consolidated basis with EOP Partnership, presented in accordance with generally
accepted accounting principles and audited by a nationally recognized firm of
independent public accountants selected by the Beacon General Partner. In
addition, as soon as practicable, but in no event later than 105 days after the
close of each calendar quarter (except the last calendar quarter of each year),
the Beacon General Partner shall cause to be mailed to each limited partner a
report containing unaudited financial statements, as of the last day of such
calendar quarter, of Beacon Partnership, or of Beacon if such statements are
prepared solely on a consolidated basis with Beacon Partnership, and such other
information as may be required by applicable law or regulation, or as the Beacon
General Partner determines to be appropriate.
 
                                       172
<PAGE>   181
 
                  CERTAIN PROVISIONS OF MARYLAND LAW AND EOP'S
                        DECLARATION OF TRUST AND BYLAWS
 
     The following summary of certain provisions of Maryland law and of the
Declaration of Trust and the EOP Bylaws does not purport to be complete and is
subject to and qualified in its entirety by reference to Maryland law and the
Declaration of Trust and the EOP Bylaws, copies of which are exhibits to the
Registration Statement of which this Proxy Statement/Prospectus is a part.
 
     The Declaration of Trust and the EOP Bylaws contain certain provisions that
could make more difficult an acquisition or change in control of EOP by means of
a tender offer, a proxy contest or otherwise. These provisions are expected to
discourage certain types of coercive takeover practices and inadequate takeover
bids and to encourage persons seeking to acquire control of EOP to negotiate
first with the EOP Board. EOP believes that the benefits of these provisions
outweigh the potential disadvantages of discouraging such proposals because,
among other things, negotiation of such proposals might result in an improvement
of their terms. See also "SHARES OF BENEFICIAL INTEREST -- Restrictions on
Ownership and Transfer."
 
CLASSIFICATION AND REMOVAL OF BOARD OF TRUSTEES; OTHER PROVISIONS
 
     The Declaration of Trust provides for the EOP Board to be divided into
three classes of trustees, with each class to consist as nearly as possible of
an equal number of trustees. The term of office of the first class of trustees
will expire at the 1998 annual meeting of shareholders; the term of the second
class of trustees will expire at the 1999 annual meeting of shareholders; and
the term of the third class will expire at the 2000 annual meeting of
shareholders. At each annual meeting of shareholders, the class of trustees to
be elected at such meeting will be elected for a three-year term, and the
trustees in the other two classes will continue in office. Because shareholders
will have no right to cumulative voting for the election of trustees, at each
annual meeting of shareholders the holders of a majority of the EOP Common
Shares will be able to elect all of the successors to the class of trustees
whose term expires at that meeting.
 
     The Declaration of Trust also provides that, except for any trustees who
may be elected by holders of a class or series of shares of beneficial interest
other than the EOP Common Shares, trustees may be removed only for cause and
only by the affirmative vote of shareholders holding at least a majority of all
the votes entitled to be cast for the election of trustees. Vacancies on the EOP
Board may be filled by the affirmative vote of the remaining trustees. A vote of
shareholders holding at least two-thirds of all the votes entitled to be cast
thereon is required to amend, alter, change, repeal or adopt any provisions
inconsistent with the foregoing classified board and trustee removal provisions.
These provisions may make it more difficult and time-consuming to change
majority control of the EOP Board and, thus, may reduce the vulnerability of EOP
to an unsolicited proposal for the takeover of EOP or the removal of incumbent
management.
 
     Because the EOP Board will have the power to establish the preferences and
rights of additional series of shares of beneficial interest without a
shareholder vote, the EOP Board may afford the holders of any series of senior
shares of beneficial interest preferences, powers and rights, voting or
otherwise, senior to the rights of holders of EOP Common Shares. The issuance of
any such senior shares of beneficial interest could have the effect of delaying,
deferring or preventing a change in control of EOP. The EOP Board, however,
currently does not contemplate the issuance of any shares of beneficial interest
other than EOP Common Shares and the EOP Preferred Shares to be issued to
holders of the Beacon Preferred Shares in connection with the Merger.
 
CHANGES IN CONTROL PURSUANT TO MARYLAND LAW
 
     MARYLAND BUSINESS COMBINATION LAW.  Under the MGCL, as applicable to real
estate investment trusts, certain "business combinations" (including certain
mergers, consolidations, share exchanges and asset transfers and issuances and
reclassifications of equity securities) between a Maryland real estate
investment trust and any person who beneficially owns ten percent or more of the
voting power of the trust's shares or an affiliate of the trust who, at any time
within the two-year period prior to the date in question, was the beneficial
owner of ten percent or more of the voting power of the then outstanding voting
shares of beneficial interest of the trust ("the Interested Shareholder") or an
affiliate of the Interested Shareholder are prohibited for five
 
                                       173
<PAGE>   182
 
years after the most recent date on which the Interested Shareholder becomes an
Interested Shareholder. Thereafter, any such business combination must be
recommended by the board of trustees of such trust and approved by at least (a)
80% of the votes entitled to be cast by holders of outstanding voting shares of
beneficial interest of the trust and (b) two-thirds of the votes entitled to be
cast by holders of voting shares of the trust other than shares held by the
Interested Shareholder with whom (or with whose affiliate) the business
combination is to be effected, unless, among other conditions, the trust's
common shareholders receive a minimum price (as defined in the MGCL) for their
shares and the consideration is received in cash or in the same form as
previously paid by the Interested Shareholder for its common shares. As
permitted by the MGCL, the EOP Board has opted out of the business combination
provisions of the MGCL. Consequently, the five-year prohibition and the
super-majority vote requirements will not apply to a business combination
involving EOP; however, the EOP Board may repeal this opt-out and cause EOP to
become subject to these provisions in the future.
 
     MARYLAND CONTROL SHARE ACQUISITION LAW.  The MGCL, as applicable to real
estate investments trusts, provides that "control shares" of a Maryland real
estate investment trust acquired in a "control share acquisition" have no voting
rights except to the extent approved by a vote of two-thirds of the votes
entitled to be cast on the matter, excluding shares owned by the acquiror, by
officers or by trustees who are employees of the trust. "Control shares" are
voting shares of beneficial interest which, if aggregated with all other such
shares previously acquired by the acquiror or in respect of which the acquiror
is able to exercise or direct the exercise of voting power (except solely by
virtue of a revocable proxy), would entitle the acquiror to exercise voting
power in electing trustees within one of the following ranges of voting power:
(i) one-fifth or more but less than one-third, (ii) one-third or more but less
than a majority, or (iii) a majority or more of all voting power. Control shares
do not include shares the acquiring person is then entitled to vote as a result
of having previously obtained shareholder approval. A "control share
acquisition" means the acquisition of control shares, subject to certain
exceptions.
 
     A person who has made or proposes to make a control share acquisition, upon
satisfaction of certain conditions (including an undertaking to pay expenses),
may compel the board of trustees of the trust to call a special meeting of
shareholders to be held within 50 days of demand to consider the voting rights
of the shares. If no request for a meeting is made, the trust may itself present
the question at any shareholders meeting.
 
     If voting rights are not approved at the meeting or if the acquiring person
does not deliver an acquiring person statement as required by the statute, then,
subject to certain conditions and limitations, the trust may redeem any or all
of the control shares (except those for which voting rights have previously been
approved) for fair value determined, without regard to the absence of voting
rights for the control shares, as of the date of the last control share
acquisition by the acquiror or of any meeting of shareholders at which the
voting rights of such shares are considered and not approved. If voting rights
for control shares are approved at a shareholders meeting and the acquiror
becomes entitled to vote a majority of the shares entitled to vote, all other
shareholders may exercise appraisal rights. The fair value of the shares as
determined for purposes of such appraisal rights may not be less than the
highest price per share paid by the acquiror in the control share acquisition.
 
     The control share acquisition statute does not apply (a) to shares acquired
in a merger, consolidation or share exchange if the trust is a party to the
transaction or (b) to acquisitions approved or exempted by the declaration of
trust or bylaws of the trust. As permitted by the MGCL, the EOP Bylaws contain a
provision opting out of the control share provisions of the MGCL, but the EOP
Board may amend the EOP Bylaws so that acquisitions of shares of EOP are subject
to these provisions in the future.
 
AMENDMENTS TO THE DECLARATION OF TRUST
 
     The Declaration of Trust, including its provisions on classification of the
EOP Board, restrictions on transferability of EOP Common Shares and removal of
trustees, may be amended only by the affirmative vote of the holders of not less
than two-thirds of all of the votes entitled to be cast on the matter. However,
amendments made in connection with a Business Combination and amendments
relating to changes in the number of authorized EOP Shares require the approval
of holders of only a majority of all votes cast at a
 
                                       174
<PAGE>   183
 
meeting of shareholders at which a quorum is present, and, in certain cases, the
approval of holders of two-thirds of the EOP Preferred Shares outstanding at the
time. Under the Maryland REIT Law, a declaration of trust may permit the
trustees by a two-thirds vote to amend the declaration of trust from time to
time to qualify as a REIT under the Code or the Maryland REIT Law without the
affirmative vote or written consent of the shareholders. The Declaration of
Trust permits such action by the EOP Board. Also under the Maryland REIT Law, a
declaration of trust may permit the board of trustees to amend the declaration
of trust to increase the aggregate number of shares of beneficial interest or
the number of shares of any class without shareholder approval. Pursuant to this
statute, the Declaration of Trust authorizes the EOP Board to increase or
decrease the aggregate number of EOP Shares or the number of EOP Shares of any
class of beneficial interest of EOP but requires that such action be approved by
the affirmative vote of a majority of all the votes cast on the matter at a
meeting of shareholders at which a quorum is present, and, in certain cases, be
approved by holders of two-thirds of the EOP Preferred Shares outstanding at the
time.
 
ADVANCE NOTICE OF TRUSTEE NOMINATIONS AND NEW BUSINESS
 
     The EOP Bylaws provide that (i) with respect to an annual meeting of
shareholders, nominations of persons for election to the EOP Board and the
proposal of business to be considered by shareholders may be made only (A)
pursuant to EOP's notice of the meeting, (B) by the EOP Board or (C) by a
shareholder who is entitled to vote at the meeting and has complied with the
advance notice procedures set forth in the EOP Bylaws and (ii) with respect to
special meetings of the shareholders, only the business specified in EOP's
notice of meeting may be brought before the meeting of shareholders and
nominations of persons for election to the EOP Board may be made only (A)
pursuant to EOP's notice of the meeting, (B) by the EOP Board or (C) provided
that the EOP Board has determined that trustees shall be elected at such
meeting, by a shareholder who is entitled to vote at the meeting and has
complied with the advance notice provisions set forth in the EOP Bylaws.
 
ANTI-TAKEOVER EFFECT OF CERTAIN PROVISIONS OF MARYLAND LAW AND OF THE
DECLARATION OF TRUST AND THE EOP BYLAWS
 
     The business combination provisions and the control share acquisition
provisions of the MGCL, in each case if they ever became applicable to EOP, the
provisions of the Declaration of Trust on classification of the EOP Board and
removal of trustees and the advance notice provisions of the EOP Bylaws could
delay, defer or prevent a transaction or a change in control of EOP that might
involve a premium price for holders of EOP Common Shares or otherwise be in
their best interests. The Declaration of Trust, as in effect, provides that a
merger, consolidation or sale of all or substantially all of the assets of EOP
must be approved by the affirmative vote of not less than a majority of all
votes entitled to be cast on the matter.
 
MARYLAND REIT LAW ASSET REQUIREMENTS
 
     To maintain its qualification as a Maryland real estate investment trust,
the Maryland REIT Law requires that EOP hold, either directly or through other
entities, at least 75% of the value of its assets in real estate assets,
mortgages or mortgage-related securities, government securities, cash and cash
equivalent items, including high-grade short-term securities and receivables.
The Maryland REIT Law also prohibits using or applying land for farming,
agriculture, horticulture or similar purposes.
 
                                       175
<PAGE>   184
 
                         SHARES OF BENEFICIAL INTEREST
 
     The summary of the terms of the shares of beneficial interest of EOP set
forth below does not purport to be complete and is subject to and qualified in
its entirety by reference to the Declaration of Trust and the EOP Bylaws, copies
of which are exhibits to the Registration Statement of which this Joint Proxy
Statement/Prospectus is a part.
 
GENERAL
 
     The Declaration of Trust provides that EOP may issue 750 million EOP Common
Shares and 100 million EOP Preferred Shares. Upon completion of the Mergers,
268,585,812 EOP Common Shares will be issued and outstanding (or subject to
issuance upon exchange of EOP Partnership Units) and 8,000,000 EOP Preferred
Shares will be issued and outstanding.
 
     Under the Maryland REIT Law, a shareholder is not personally liable for
obligations of EOP solely as a result of his status as a shareholder. The
Declaration of Trust provides that no shareholder will be liable for any debt,
claim, demand, judgment or obligation of EOP by reason of being a shareholder
nor shall any shareholder be subject to any personal liability in tort, contract
or otherwise to any person in connection with the property or affairs of EOP by
reason of being a shareholder. The EOP Bylaws further provide that EOP will
indemnify any shareholder or former shareholder (a) who has been successful, on
the merits or otherwise, in the defense of a proceeding to which he was made a
party by reason of service in such capacity as shareholder, against reasonable
expenses incurred by him or her in connection with the proceeding; and (b)
against any claim or liability to which he or she may become subject by reason
of such status. In addition, EOP will, without requiring a preliminary
determination of the ultimate entitlement to indemnification, pay or reimburse,
in advance of final disposition of a proceeding, reasonable expenses incurred by
the shareholder or former shareholder made a party to the proceeding by reason
of such status. EOP may, with the approval of the EOP Board, provide such
indemnification or payment or reimbursement of expenses to any shareholder or
former shareholder who served a predecessor of EOP. However, with respect to
tort claims, contractual claims where shareholder liability is not so negated,
claims for taxes and certain statutory liability, the shareholders may, in some
jurisdictions, be personally liable to the extent that such claims are not
satisfied by EOP. Inasmuch as EOP carries public liability insurance which it
considers adequate, any risk of personal liability to shareholders is limited to
situations in which EOP's assets plus its insurance coverage would be
insufficient to satisfy the claims against EOP and its shareholders.
 
EOP COMMON SHARES
 
     When issued, all EOP Common Shares for which EOP Partnership Units are
exchangeable will be duly authorized, fully paid and nonassessable. Subject to
the preferential rights of any other shares of beneficial interest, including
without limitation, the EOP Preferred Shares, and to the provisions of the
Declaration of Trust regarding restrictions on transfers of shares of beneficial
interest, holders of EOP Common Shares are entitled to receive distributions if,
as and when authorized and declared by the EOP Board out of assets legally
available therefor and to share ratably in the assets of EOP legally available
for distribution to EOP Shareholders in the event of its liquidation,
dissolution or winding-up after payment of, or adequate provision for, all known
debts and liabilities of EOP. EOP currently intends to pay regular quarterly
distributions. In order to remain qualified as a REIT under the Code, EOP must
distribute 95% of its taxable income (other than net capital gain) annually. See
"FEDERAL INCOME TAX CONSIDERATIONS -- Requirements for Qualification as a
REIT -- Annual Distribution Requirements Applicable to REITs."
 
     Subject to the provisions of the Declaration of Trust regarding
restrictions on transfer of shares of beneficial interest, each outstanding EOP
Common Share entitles the holder to one vote on all matters submitted to a vote
of EOP Shareholders, including the election of trustees, and, except as provided
with respect to any other class or series of shares of beneficial interest,
including without limitation, the EOP Preferred Shares, the holders of EOP
Common Shares will possess the exclusive voting power. There is no cumulative
voting in the election of trustees, which means that the holders of a majority
of the outstanding
 
                                       176
<PAGE>   185
 
EOP Common Shares can elect all of the trustees then standing for election and
the holders of the remaining shares of beneficial interest, if any, will not be
able to elect any trustees.
 
     Holders of EOP Common Shares have no preferences, conversion, sinking fund,
redemption rights or preemptive rights to subscribe for any securities of EOP.
Subject to the provisions of the Declaration of Trust regarding restrictions on
ownership and transfer, EOP Common Shares have equal distribution, liquidation
and other rights.
 
     Pursuant to the Maryland REIT Law, a Maryland real estate investment trust
generally cannot amend its declaration of trust or merge, unless approved by the
affirmative vote of shareholders holding at least two-thirds of the shares
entitled to vote on the matter unless a lesser percentage (but not less than a
majority of all of the votes entitled to be cast on the matter) is set forth in
the trust's declaration of trust. The Declaration of Trust contains such a
provision providing for a lesser percentage, a majority of outstanding shares
entitled to be cast in the matter, with respect to transactions pursuant to
which EOP's assets will be combined with those of one or more other entities
(whether by merger, sale or other transfer of assets, consolidation or share
exchange).
 
     Under the Maryland REIT Law, a declaration of trust may permit the trustees
by a two-thirds vote to amend the declaration of trust from time to time to
qualify as a REIT under the Code or the Maryland REIT Law without the
affirmative vote or written consent of the shareholders. The Declaration of
Trust permits such action by the EOP Board. Also under the Maryland REIT Law, a
declaration of trust may permit the board of trustees to amend the declaration
of trust to increase the aggregate number of shares of beneficial interest or
the number of shares of any class without shareholder approval. Pursuant to this
statute, the Declaration of Trust authorizes the EOP Board to increase or
decrease the aggregate number of EOP Shares or the number of EOP Shares of any
class of beneficial interest of EOP but requires that such action be approved by
the affirmative vote of a majority of all the votes cast on the matter at a
meeting of shareholders at which a quorum is present, and in certain cases, that
such action be approved by holders of two-thirds of the EOP Preferred Shares
outstanding at the time.
 
     The Declaration of Trust authorizes the EOP Board to reclassify any
unissued EOP Common Shares into other classes or series of beneficial interest
and to establish the number of shares in each class or series and to set the
preferences, conversion and other rights, voting powers, restrictions,
limitations as to distributions or other distributions, qualifications or terms
or conditions of redemption for each such class or series, subject, in certain
cases to the approval of holders of two-thirds of EOP Preferred Shares
outstanding at the time.
 
PREFERRED SHARES
 
     The Declaration of Trust authorizes the EOP Board to issue 100 million
Preferred Shares, to classify any unissued Preferred Shares and to reclassify
any previously classified but unissued Preferred Shares of any series from time
to time, in one or more series of any shares of beneficial interest, as
authorized by the EOP Board. Prior to issuance of shares of each series, the EOP
Board is required by the Maryland REIT Law and the Declaration of Trust to set,
subject to the provisions of the Declaration of Trust regarding the restriction
on transfer of shares of beneficial interest, the terms, preferences, conversion
or other rights, voting powers, restrictions, limitations as to distributions or
other distributions, qualifications and terms or conditions of redemption for
each such series. As of the date hereof, no preferred shares of beneficial
interest are outstanding. In connection with the Merger, EOP will issue
8,000,000 EOP Preferred Shares in exchange for the 8,000,000 Beacon Preferred
Shares currently outstanding.
 
EOP PREFERRED SHARES
 
     All EOP Preferred Shares to be issued in the Merger will be duly
authorized, fully paid and non-assessable.
 
     DISTRIBUTIONS.  Holders of EOP Preferred Shares shall be entitled to
receive, when and as authorized by the EOP Board, out of funds legally available
for the payment of distributions, cumulative preferential cash distributions at
the rate of 8.98% of the $25.00 liquidation preference per annum (equivalent to
a fixed annual
 
                                       177
<PAGE>   186
 
amount of $2.245 per share). Such distributions shall be cumulative from the
Effective Time and shall be payable quarterly in arrears on or before March 15,
June 15, September 15 and December 15 of each year or, if not a business day,
the next succeeding business day. Distributions will be computed on the basis of
a 360-day year consisting of twelve 30-day months. Distributions will be payable
to the holders of record of EOP Preferred Shares as they appear in the share
records of EOP at the close of business on the applicable record date, which
shall be the first day of the calendar month in which the applicable
distribution payment date falls or such other date designated by the EOP Board
for the payment of distributions that is not more than 30 nor less than 10 days
prior to such distribution payment date.
 
     No distributions on the EOP Preferred Shares shall be authorized by the EOP
Board or paid or set apart for payment if such authorization, payment or setting
apart for payment would violate any agreement of EOP or is restricted or
prohibited by law. Distributions on the EOP Preferred Shares will, nonetheless,
accrue whether or not any of the foregoing restrictions exist, whether or not
there are funds legally available for the payment thereof and whether or not
they are authorized, and accrued but unpaid distributions will accumulate as of
the distribution payment date on which they first become payable.
 
     Except for pro rata distributions with respect to the EOP Preferred Shares
and any EOP Parity Shares, no distributions on any EOP Parity Shares or EOP
Junior Shares will be authorized, paid or set aside for payment (other than a
distribution payable in EOP Junior Shares) for any period, no other distribution
on any EOP Parity Shares or EOP Junior Shares and no redemption, purchase or
other acquisition for consideration of EOP Parity Shares or EOP Junior Shares
shall be made, in each case unless full cumulative distributions on the EOP
Preferred Shares have been or contemporaneously are authorized and paid or
authorized and a sum sufficient for full payment thereof is set aside.
 
     VOTING.  Holders of EOP Preferred Shares have no other voting rights except
as provided by law and as described below.
 
     Whenever distributions on EOP Preferred Shares are in arrears for six or
more quarterly periods, holders of EOP Preferred Shares will be entitled to vote
separately as a class with the holders of all EOP Parity Shares for the election
of two additional trustees of EOP. Such election shall be held at a special
meeting called by the holders of record of at least 20% of the outstanding EOP
Preferred Shares or the outstanding EOP Parity Shares or, if the request for a
special meeting is received by EOP less than 90 days prior to the next annual or
special meeting of shareholders, at the next annual or such special meeting of
shareholders and at each subsequent annual meeting of shareholders until all
arrearages and the distribution for the then current distribution period shall
have been fully paid or a sum sufficient for the full payment thereof shall have
been set aside. Vacancies for trustees elected by holders of EOP Preferred
Shares and EOP Parity Shares shall be filled by the remaining trustee so elected
then in office, or there is no such remaining trustee, by vote of holders of a
majority of the outstanding EOP Preferred Shares and the outstanding EOP Parity
Shares voting as a single class. A trustee elected by the holders of EOP
Preferred Shares and EOP Parity Shares may be removed with or without cause and
only by vote of holders of a majority of the outstanding EOP Preferred Shares
and the outstanding EOP Parity Shares voting as a single class.
 
     In addition to the foregoing voting rights, for so long as any EOP
Preferred Shares are outstanding, any authorization of, increase in the
authorized amount of or number of issued, or reclassification of, EOP Senior
Shares or EOP Senior Convertible Securities or any amendment of EOP's
Declaration of Trust, by merger, consolidation or otherwise, which materially
and adversely affects any right, preference, privilege or voting power of the
EOP Preferred Shares or the holders thereof must be approved by holders of at
least two-thirds of the EOP Preferred Shares outstanding at the time. For
purposes of the foregoing sentence, any amendment of EOP's Declaration of Trust
resulting in the EOP Preferred Shares remaining outstanding with the terms
thereof materially unchanged, any increase in the authorized amount of Preferred
Shares or any creation or issuance of any EOP Parity Shares shall not be deemed
to materially and adversely affect any right, preference, privilege or voting
power of the EOP Preferred Shares or the holders thereof.
 
     OWNERSHIP LIMIT.  The restrictions on transferability and ownership
described in "-- Restrictions on Ownership and Transfer" apply to the EOP
Preferred Shares.
 
                                       178
<PAGE>   187
 
     PREEMPTIVE RIGHTS, CONVERSION, REDEMPTION.  Holders of EOP Preferred Shares
do not have any preemptive rights. The EOP Preferred Shares are not convertible,
redeemable or entitled to the benefit of any sinking fund, except that they may
be purchased by EOP under certain provisions of the Declaration of Trust
designed to enable EOP to preserve its status as a REIT under the Code (see
"FEDERAL INCOME TAX CONSIDERATIONS -- Requirements for Qualification as a
REIT"); and the EOP Preferred Shares may be redeemed by EOP as described below.
 
     On and after June 15, 2002, EOP, at its option and upon not less than 30
nor more than 60 days' written notice, may redeem EOP Preferred Shares, in whole
or part, at any time or from time to time, for cash at a redemption price of
$25.00 per share, plus all accrued and unpaid distributions thereon to the date
fixed for redemption, without interest, subject to the following limitations and
to compliance by EOP with the procedural requirements applicable to the
redemption of EOP Preferred Shares. First, if less than all of the outstanding
EOP Preferred Shares are to be redeemed, the EOP Preferred Shares to be redeemed
shall be selected pro rata (as nearly as may be practicable without creating
fractional shares) or by any other equitable method determined by EOP. Second,
the redemption price of EOP Preferred Shares (other than the portion thereof
consisting of accrued and unpaid distributions) is payable solely out of the
sale proceeds of other equity securities of EOP and any rights (other than debt
securities convertible into or exchangeable for such equity securities) or
options to purchase any of the foregoing. Third, unless full cumulative
distributions on all EOP Preferred Shares have been or contemporaneously are
authorized and paid and a sum sufficient for the payment thereof set apart for
all past distribution periods and the then current distribution period, no EOP
Preferred Shares shall be redeemed unless all outstanding EOP Preferred Shares
are simultaneously redeemed, and EOP shall not purchase or otherwise acquire
directly or indirectly any EOP Preferred Shares (except by exchange for EOP
Junior Shares); provided, however, that the foregoing shall not prevent the
purchase by EOP of EOP Preferred Shares in order to ensure that EOP remains
qualified as a REIT for federal income tax purposes or the purchase or
acquisition of EOP Preferred Shares pursuant to a purchase or exchange offer
made on the same terms to holders of all outstanding EOP Preferred Shares.
 
     Any EOP Preferred Shares that have been redeemed shall, after such
redemption, have the status of authorized but unissued preferred shares of
beneficial interest, without designation as to series until such shares are once
more designated as part of a particular series by the EOP Board.
 
     LIQUIDATION PREFERENCE.  In the event of any voluntary or involuntary
liquidation, dissolution or winding up of EOP, the holders of any outstanding
EOP Preferred Shares will be entitled to receive out of the assets of EOP
available for distribution to shareholders remaining after payment or provision
for payment of all debts and other liabilities of EOP other than EOP's
obligations with respect to any outstanding EOP Junior Shares, a liquidation
preference of $25.00 per share, plus an amount equal to any accrued and unpaid
distributions to the date of payment. If upon any voluntary or involuntary
liquidation, dissolution or winding up of EOP, the assets of EOP shall be
insufficient to make such full payments to holders of EOP Preferred Shares, then
such assets shall be distributed pro rata among holders of EOP Preferred Shares.
After payment of the full amount of the liquidating distribution to which they
are entitled, the holders of EOP Preferred Shares will not be entitled to any
further participation in any distribution of assets by EOP. Neither a
consolidation or merger of EOP with or into another corporation nor a merger of
another corporation with or into EOP nor a sale, lease or conveyance of all or
substantially all of EOP's property or business shall be considered a
liquidation, dissolution or winding up of EOP.
 
POWER TO ISSUE ADDITIONAL EOP COMMON SHARES AND PREFERRED SHARES
 
     EOP believes that the power of the EOP Board to issue additional authorized
but unissued EOP Common Shares or Preferred Shares and to classify or reclassify
unissued EOP Common Shares or Preferred Shares and thereafter to cause EOP to
issue such classified or reclassified shares of beneficial interest will provide
EOP with increased flexibility in structuring possible future financings and
acquisitions and in meeting other needs which might arise. The additional
classes or series, as well as the EOP Common Shares, will be available for
issuance without further action by EOP Shareholders, unless such action is
required by applicable law or the rules of any stock exchange or automated
quotation system on which EOP's securities may be listed or traded. The EOP
Preferred Shares have certain provisions that could delay, defer or prevent a
 
                                       179
<PAGE>   188
 
transaction or a change in control of EOP that might involve a premium price for
holders of EOP Common Shares or otherwise be in their best interest. Moreover,
although the EOP Board has no such intention at the present time, it could
establish another series of Preferred Shares that could cause the same result.
(See "-- EOP Preferred Shares -- Voting" above).
 
RESTRICTIONS ON OWNERSHIP AND TRANSFER
 
     For EOP to qualify as a REIT under the Code, no more than 50% in value of
its outstanding shares of beneficial interest may be owned, actually or
constructively, by five or fewer individuals (as defined in the Code to include
certain entities) during the last half of a taxable year (other than the first
year for which an election to be treated as a REIT has been made) or during a
proportionate part of a shorter taxable year. In addition, if EOP, or an owner
of 10% or more of EOP, actually or constructively owns 10% or more of a tenant
of EOP (or a tenant of any partnership in which EOP is a partner), the rent
received by EOP (either directly or through any such partnership) from such
tenant will not be qualifying income for purposes of the REIT gross income tests
of the Code. A REIT's shares also must be beneficially owned by 100 or more
persons during at least 335 days of a taxable year of twelve months or during a
proportionate part of a shorter taxable year (other than the first year for
which an election to be treated as a REIT has been made).
 
     EOP.  In order to assist in preserving EOP's status as a REIT under the
Code, the Declaration of Trust provides that no holder of shares EOP Shares may
own, or be deemed to own by virtue of the attribution provisions of the Code,
more than the EOP Ownership Limit or the Excepted Holder Limit, whichever is
applicable. The EOP Board, in its sole and absolute discretion, may grant to any
holder of EOP Shares an Excepted Holder Limit subject to satisfaction of certain
conditions set forth in the Declaration of Trust. The EOP Board is required to
waive or modify the EOP Ownership Limit with respect to one or more persons who
would not be treated as "individuals" for purposes of the Code if such person
submits to the EOP Board information satisfactory to the EOP Board, in its
reasonable discretion, demonstrating that (i) such person is not an individual
for purposes of the Code, (ii) such ownership will not cause a person who is an
individual to be treated as owning EOP Shares in excess of the EOP Ownership
Limit, applying the applicable constructive ownership rules, and (iii) such
ownership will not otherwise jeopardize EOP's status as a REIT. As a condition
of such waiver, the EOP Board may, in its reasonable discretion, require
undertakings or representations from the applicant to ensure that the conditions
in clauses, (i), (ii) and (iii) of the preceding sentence are satisfied and will
continue to be satisfied as long as such person owns shares in excess of the EOP
Ownership Limit. The EOP Board has the authority to increase the EOP Ownership
Limit from time to time, but will not have the authority to do so to the extent
that, after giving effect to such increase, five beneficial owners of EOP Shares
could beneficially own in the aggregate more than 49.5% of the outstanding EOP
Shares. The EOP Board may reduce the Excepted Holder Limit of any holder of EOP
Shares only with such holder's written consent or pursuant to any agreements
made between EOP and such holder at the time such Excepted Holder Limit was
granted, provided that no Excepted Holder Limit may be reduced to a percentage
that is less than the EOP Ownership Limit.
 
     Any transfer (including any issuance, sale, transfer, gift, assignment,
devise or other disposition) of EOP Shares that would: (i) result in a holder
holding a number of EOP Shares in excess of the EOP Ownership Limit or the
Excepted Holder Limit, whichever is applicable, (ii) result in EOP being
"closely held" within the meaning of Section 856(h) of the Code, (iii) result in
the disqualification of EOP as a REIT or (iv) result in the outstanding EOP
Shares being owned by fewer than 100 persons or entities will be void and of no
force or effect with respect to the Prohibited Owner, in the case of the
foregoing clauses (i), (ii) and (iii), as to that number of EOP Shares that
exceeds the EOP Ownership Limit or the Excepted Holder Limit, as applicable
(referred to as "excess shares"), and in the case of the foregoing clause (iv),
as to all of the EOP Shares purported to be transferred, and the Prohibited
Owner shall acquire no right or interest therein. Any such excess shares
described above will be transferred automatically to a Charitable Trust for the
benefit of a Charitable Beneficiary. Such transfer shall be deemed to be
effective as of the close of business on the business day prior to the purported
transfer. If any such transfer to the Charitable Trust is not effective for any
reason, the transfer of such excess shares will be void.
 
                                       180
<PAGE>   189
 
     Any person or entity who acquires or intends to acquire EOP Shares that
will or may violate the foregoing provisions must immediately notify EOP of such
acquisition, or give EOP 15 days prior notice thereof, and must provide EOP such
other information as EOP may request in order to determine the effect of such
acquisition of EOP's status as a REIT.
 
     Subject to the purchase rights of EOP described below, within 20 days of
receiving notice from EOP of the transfer of shares to the Charitable Trust, the
Charitable Trustee will be required to sell such excess shares to a person or
entity, including without limitation EOP, who could own such shares without
violating the restrictions described above, and distribute to the Prohibited
Owner an amount equal to the lesser of (i) the price paid by the Prohibited
Owner for such excess shares, or if no payment was made in respect thereof, the
EOP Market Price on the date on which such shares became excess shares and (ii)
the sales proceeds received by the Charitable Trustee for such excess shares.
Any proceeds in excess of the amount distributable to the Prohibited Owner will
be distributed to the Charitable Beneficiary.
 
     Excess shares transferred to the Charitable Trust shall be deemed to have
been offered for sale to EOP, or its designee, at a price per share equal to the
lesser of (i) the price per share in the transaction that resulted in such
transfer to the Charitable Trust (or, in the case of a devise or gift, the EOP
Market Price at the time of such devise or gift) and (ii) the EOP Market Price
of such shares on the date EOP, or its designee, accepts such offer. EOP will
have the right to accept such offer until the Charitable Trustee has sold such
excess shares as described above. Upon a sale of such excess share to EOP, the
interest of the Charitable Beneficiary in such excess shares shall terminate and
the Charitable Trustee shall distribute the net proceeds of the sale to the
Prohibited Owner.
 
     Prior to a sale of any excess shares by the Charitable Trust, the
Charitable Trustee shall have all voting rights and rights to distributions or
other distributions (including distributions upon liquidation, dissolution or
winding up of EOP or any distributions of assets of EOP) with respect to such
excess shares. Any distribution or other distribution paid to the Prohibited
Owner prior to the discovery by EOP that such excess shares had been transferred
to the Charitable Trust must paid to the Charitable Trustee upon demand. Subject
to applicable law, effective as of the date that any excess shares have been
transferred to the Charitable Trust, the Charitable Trustee shall have the
authority in its sole discretion (i) to rescind as void any vote cast by a
Prohibited Owner prior to the discovery by EOP that such excess shares have been
transferred to the Charitable Trust and (ii) to recast such vote in accordance
with the instructions of the Charitable Trustee. Notwithstanding the foregoing,
if EOP has already taken irreversible action with respect to matters covered by
such vote, the Charitable Trustee shall not have the authority to rescind and
recast such vote.
 
     The foregoing restrictions on transferability and ownership will not apply
if the EOP Board determines that they are no longer required in order for EOP to
continue to qualify as a REIT.
 
     All persons or entities who own, directly or by virtue of the attribution
provisions of the Code, more than 5% (or such other percentage between 0.5% and
5% as provided in the rules and regulations promulgated under the Code) of the
lesser of the number or value of the outstanding EOP Shares must give a written
notice to EOP by January 30 of each year stating the name and address of such
owner, the number of EOP Shares owned and a description of the manner in which
such EOP Shares are held; in addition, a holder of record of EOP Shares subject
to the foregoing requirement who holds such EOP Shares as nominee for another
person or entity which is required to include in gross income the distributions
received on such shares must also give notice of the name and address of such
person or entity and the number of EOP Shares of such person or entity with
respect to which such holder of record is nominee. In addition, each record,
beneficial and constructive holder of EOP Shares must, upon demand of EOP,
disclose to EOP in writing any information with respect to the direct, indirect
and constructive ownership thereof as the EOP Board deems necessary to comply
with the provisions of the Code applicable to REITs, to comply with the
requirements of any taxing authority or governmental agency or to determine any
such compliance.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for the EOP Common Shares is Boston
EquiServe, L.P., an affiliate of BankBoston, N.A.
 
                                       181
<PAGE>   190
 
                       COMPARATIVE RIGHTS OF SHAREHOLDERS
 
     Beacon is organized as a corporation and EOP is organized as a real estate
investment trust under the laws of the State of Maryland. As a Maryland
corporation, Beacon is subject to the MGCL, which is a general corporation
statute dealing with a wide variety of matters, including election, tenure,
duties, liabilities and indemnification of directors and officers; dividends and
other distributions; meetings and voting rights of stockholders; and
extraordinary actions, such as amendments to the charter, mergers, sales of all
or substantially all of the assets and dissolution. As a Maryland real estate
investment trust, EOP is governed by the Maryland REIT Law and certain other
provisions of the Annotated Code of Maryland. The Maryland REIT Law covers some
of the same matters covered by MGCL, including liabilities of the trust,
shareholders, trustees and officers; amendment of the declaration of trust; and
mergers of a real estate investment trust with other entities. There are many
matters that are addressed in the MGCL that are not dealt with in the Maryland
REIT Law, and it is a general practice of REITs to address some of these matters
through provisions in the declaration of trust.
 
     Certain differences between (a) the MGCL and the Maryland REIT Law and (b)
Beacon's Articles and Bylaws and the Declaration of Trust and EOP Bylaws are
discussed below. However, the discussion of the comparative rights of
shareholders of Beacon and shareholders of EOP set forth below does not purport
to be complete and is subject to and qualified in its entirety by reference to
the MGCL and the Maryland REIT Law and also to the Beacon Articles and Bylaws
and the Declaration of Trust and EOP Bylaws. Copies of these documents have been
filed as exhibits to the Registration Statement of which this Proxy Statement/
Prospectus is a part.
 
     At the Effective Time, Beacon Shareholders automatically would become
shareholders of EOP and their rights as shareholders would be determined by the
Declaration of Trust and the EOP Bylaws.
 
CAPITALIZATION
 
     EOP.  EOP is authorized to issue (i) 750,000,000 EOP Common Shares, of
which 161,987,228 shares were issued and outstanding as of the EOP Record Date
and (ii) 100,000,000 Preferred Shares, of which no shares were issued and
outstanding as of the EOP Record Date. The EOP Board has adopted resolutions
classifying and designating 8,000,000 of the Preferred Shares as EOP Preferred
Shares and articles supplementary relating to such EOP Preferred Shares, which
shares will be issued in the Merger in exchange for Beacon Preferred Shares. The
EOP Board, with the approval of the holders of EOP Common Shares by the majority
of votes cast at a meeting of shareholders duly called and at which a quorum is
present, may amend the Declaration of Trust from time to time to increase or
decrease the aggregate number of shares or the number of shares of any class
that EOP has the authority to issue, provided, that, so long as any EOP
Preferred Shares are outstanding, any amendment of the Declaration of Trust
which authorizes or creates, or increases, the authorized amount of any class or
series of shares ranking prior to the EOP Preferred Shares with respect to
payment of distributions or the distribution of assets upon liquidation,
dissolution or winding up of EOP ("EOP Senior Shares") or any obligations or
securities convertible into or evidencing the right to purchase any EOP Senior
Shares ("EOP Senior Convertible Securities") must be approved by holders of at
least two-thirds of the EOP Preferred Shares outstanding at the time.
 
     The EOP Board may, without further action by the EOP Shareholders, provide
for the issuance of EOP Common shares in one or more classes or series and
Preferred Shares in one or more series and, subject to the restrictions on
transfer and ownership set forth in the Declaration of Trust (see "-- REIT
Qualification Provisions -- EOP" below) and the express terms of any class or
series of shares outstanding at the time, fix the preferences, conversion or
other rights, voting powers, restrictions, limitations as to distributions or
other distributions, qualifications and terms and conditions of redemption
thereof, by adopting a resolution or resolutions creating and designating such
class or series. Subject to an express provision to the contrary in the terms of
any class or series of authorized shares, the EOP Board has the power to divide
or combine the outstanding shares of any class or series, without a vote of
shareholders. For so long as any EOP Preferred Shares are outstanding, no EOP
Senior Shares or EOP Senior Convertible Securities may be authorized, no
authorized shares may be reclassified into EOP Senior Shares or EOP Senior
Convertible Securities nor may
 
                                       182
<PAGE>   191
 
the number of issued EOP Senior Shares or EOP Senior Convertible Securities be
increased without the approval of at least two-thirds of the EOP Preferred
Shares outstanding at the time.
 
     BEACON.  Beacon is authorized to issue (i) 100,000,000 Beacon Common
Shares, of which 56,267,567 shares were issued and outstanding as of the Beacon
Record Date, (ii) 25,000,000 preferred shares of beneficial interest, $.01 par
value, of which 9,200,000 shares have been classified and designated as Beacon
Preferred Shares, of which 8,000,000 Beacon Preferred Shares and no other
preferred shares were issued and outstanding as of the Beacon Record Date and
(iii) 50,000,000 shares of excess stock, $0.01 par value per share (the "Beacon
Excess Shares"), none of which were issued or outstanding as of the Beacon
Record Date. The aggregate number of shares that Beacon has the authority to
issue may be increased or decreased only with the approval of holders of not
less than two-thirds of the Beacon Common Shares entitled to be cast on the
matter, provided, that, so long as any Beacon Preferred Shares are outstanding,
any amendment of the Beacon Articles which authorizes, creates, or increases,
the authorized amount of any class or series of shares ranking prior to the
Beacon Preferred Shares with respect to payment of distributions or the
distribution of assets upon liquidation, dissolution or winding up of Beacon
("Beacon Senior Shares") or any obligations or securities convertible into or
evidencing the right to purchase any Beacon Senior Shares ("Beacon Senior
Convertible Securities") must be approved by holders of at least two-thirds of
the Beacon Preferred Shares outstanding at the time.
 
     The Beacon Board may, without further action by the Beacon Shareholders,
provide for the issuance of Beacon preferred shares of beneficial interest in
one or more series and to fix the preferences, conversion and other rights,
voting rights, restrictions and limitations as to dividends, qualifications and
terms and conditions of redemption as the Beacon Board may determine. Subject to
an express provision to the contrary in the terms of any class or series of
authorized shares, the Beacon Board has the power to divide or combine the
outstanding shares of any class or series, without a vote of shareholders. For
so long as any Beacon Preferred Shares are outstanding, no Beacon Senior Shares
or Beacon Senior Convertible Securities may be authorized, no authorized shares
may be reclassified into Beacon Senior Shares or Beacon Senior Convertible
Securities nor may the number of issued Beacon Senior Shares or Beacon Senior
Convertible Securities be increased without the approval of at least two-thirds
of the Beacon Preferred Shares outstanding at the time.
 
VOTING RIGHTS
 
     EOP.  Each holder of EOP Common Shares is entitled to one vote per share
and to the same and identical voting rights as other holders of EOP Common
Shares. Holders of EOP Common Shares do not have cumulative voting rights.
Holders of EOP Common Shares are entitled to vote only on the following matters:
(i) election and removal of trustees, (ii) amendment of the Declaration of
Trust, (iii) termination of EOP, (iv) merger or consolidation of EOP, or the
sale or disposition of substantially all of the property of EOP, (v) such other
matters with respect to which the EOP Board has adopted a resolution declaring
that a proposed action is advisable and directing that the matter be submitted
to the shareholders for approval or ratification, (vi) such other matters as may
be properly brought before a meeting by a shareholder pursuant to the EOP Bylaws
and (vii) such other matters as required by applicable law.
 
     Whenever distributions on EOP Preferred Shares are in arrears for six or
more quarterly periods, holders of EOP Preferred Shares will be entitled to vote
separately as a class with the holders of all other series of preferred shares
of beneficial interest ranking on a parity with the EOP Preferred Shares as to
distributions or on liquidation (the "EOP Parity Shares") for the election of
two additional trustees of EOP at a special meeting called by the holders of
record of at least 20% of the outstanding EOP Preferred Shares or the holders of
shares of any other series of EOP Parity Shares so in arrears (unless such
request is received less than 90 days before the date fixed for the next annual
or special meeting of shareholders) or at the next annual meeting of
shareholders. Such voting rights will continue until all accumulated dividends
and the dividend for the then current period have been fully paid or authorized
and a sum sufficient for such payment is set aside for payment in full. In
addition, for so long as any EOP Preferred Shares are outstanding, any
authorization of, increase in the authorized amount of or number of issued, or
reclassification of, of EOP Senior Shares or EOP Senior Convertible Securities
or any amendment or repeal of the Declaration of Trust, by merger, consolidation
or otherwise, which materially and adversely affects any right, preference,
privilege or voting
 
                                       183
<PAGE>   192
 
power of the EOP Preferred Shares or the holders thereof must be approved by
holders of at least two-thirds of the EOP Preferred Shares outstanding at the
time. For purposes of the foregoing sentence, any amendment of the Declaration
of Trust resulting in the EOP Preferred Shares remaining outstanding with the
terms thereof materially unchanged, any increase in the authorized amount of
preferred shares of beneficial interest or any creation or issuance of any EOP
Parity Shares or EOP Junior Shares shall not be deemed to materially and
adversely affect any right, preference, privilege or voting power of the EOP
Preferred Shares or the holders thereof. Holders of EOP Preferred Shares have no
other voting rights except as provided by law.
 
     BEACON.  Each holder of Beacon Common Shares is entitled to one vote per
share and to the same and identical voting rights as other holders of Beacon
Common Shares. Holders of Beacon Common Shares do not have cumulative voting
rights. Holders of Beacon Common Shares are entitled to vote on all matters
submitted to them for a vote and any other matters requiring their vote under
applicable law.
 
     Whenever dividends on Beacon Preferred Shares are in arrears for six or
more quarterly periods, holders of Beacon Preferred Shares will be entitled to
vote separately as a class with the holders of all other series of preferred
shares of beneficial interest ranking on a parity with the Beacon Preferred
Shares as to dividends or on liquidation (the "Beacon Parity Shares") for the
election of two additional directors of Beacon at a special meeting called by
the holders of record of at least 20% of the outstanding shares of the Beacon
Preferred Shares or the holders of shares of any other series of Beacon Parity
Shares so in arrears (unless such request is received less than 90 days before
the date fixed for the next annual or special meeting of shareholders) or at the
next annual meeting of shareholders. Such voting rights will continue until all
accumulated dividends and the dividend for the then current period have been
fully paid or authorized and a sum sufficient for such payment is set aside for
payment in full. In addition, for so long as any Beacon Preferred Shares are
outstanding, any authorization of, increase in the authorized amount of or
number of issued, or reclassification of, of Beacon Senior Shares or Beacon
Senior Convertible Securities or any amendment or repeal of the Beacon Articles,
by merger, consolidation or otherwise, which materially and adversely affects
any right, preference, privilege or voting power of the Beacon Preferred Shares
or the holders thereof must be approved by holders of at least two-thirds of the
Beacon Preferred Shares outstanding at the time. For purposes of the foregoing
sentence, any amendment of the Beacon Articles resulting in the Beacon Preferred
Shares remaining outstanding with the terms thereof materially unchanged, any
increase in the authorized amount of preferred shares of beneficial interest or
any creation or issuance of any Beacon Parity Shares or Beacon Junior Shares
shall not be deemed to materially and adversely affect any right, preference,
privilege or voting power of the Beacon Preferred Shares or the holders thereof.
Holders of Beacon Preferred Shares have no other voting rights except as
provided by law.
 
     Holders of Beacon Excess Shares have no voting rights on any matters except
as otherwise expressly required by law.
 
TRUSTEES/DIRECTORS
 
     EOP.  The number of trustees shall be not less than nine nor more than 15,
who, except as described in the following sentence and except with respect to
trustees elected by holders of EOP Preferred Shares and EOP Parity Shares, shall
be elected at the annual meeting of shareholders. Subject to the foregoing, the
EOP Board, by majority vote, may increase the number of trustees, and fill any
vacancies on the EOP Board other than vacancies for trustees elected by holders
of EOP Preferred Shares and EOP Parity Shares, whether arising from an increase
in the number of trustees or from the failure by shareholders to elect the full
authorized number of trustees. Except during the period when a vacancy exists,
at least two-thirds of the trustees shall be persons who are not executive
officers (as defined in Rule 145 under the Securities Act) of EOP or persons
affiliated (as defined in Rule 145 under the Securities Act) with Mr. Zell or
his affiliates.
 
     Whenever distributions on the EOP Preferred Shares are in arrears for six
or more quarterly periods, holders of the EOP Preferred Shares will be entitled
to vote separately as a class with the holders of all EOP Parity Shares for the
election of two additional trustees of EOP. Such election shall be held at a
special meeting called by the holders of record of at least 20% of the
outstanding EOP Preferred Shares or the outstanding EOP Parity Shares or, if the
request for a special meeting is received by EOP less than 90 days
 
                                       184
<PAGE>   193
 
prior to the next annual or special meeting of shareholders, at the next annual
or such special meeting of shareholders and at each subsequent annual meeting of
shareholders until all arrearages and the distribution for the then current
distribution period shall have been fully paid or a sum sufficient for the full
payment thereof shall have been set aside. Vacancies for trustees elected by
holders of EOP Preferred Shares and EOP Parity Shares shall be filled by the the
written consent of the remaining trustee elected by such holders then in office,
or if there is no such remaining trustee, by vote of holders of a majority of
the outstanding EOP Preferred Shares and the outstanding EOP Parity Shares
voting as a single class.
 
     As permitted by the Declaration of Trust, with the exception of any members
elected by holders of EOP Preferred Shares and EOP Parity Shares, the EOP Board
is divided into three classes of trustees. The initial terms of the first,
second and third classes expire in 1998, 1999 and 2000, respectively. Beginning
in 1998, trustees of each class will be chosen for three-year terms upon the
expiration of their current terms and each year one class of trustees will be
elected by the EOP Shareholders.
 
     A trustee other than a trustee elected by the holders of EOP Preferred
Shares and EOP Parity Shares may be removed only with cause by the affirmative
vote of shareholders holding not less than a majority of all shares then
outstanding and entitled to vote generally in the election of trustees. A
trustee elected by the holders of EOP Preferred Shares and EOP Parity Shares may
be removed with or without cause and only by vote of holders of a majority of
the outstanding EOP Preferred Shares and the outstanding EOP Parity Shares
voting together as a single class.
 
     BEACON.  The number of Beacon Directors shall not be fewer than the greater
of two or the minimum number permitted by the MGCL and not more than nine who,
except as described in the following sentence and except with respect to
directors elected by holders of Beacon Preferred Shares and Beacon Parity
Shares, shall be elected at the annual meeting of shareholders. Subject to the
foregoing, the Beacon Board, by majority vote, may (i) increase or decrease the
number of directors and (ii) except for any vacancies for directors elected by
the holders of Beacon Preferred Shares and vacancies created by the removal of a
director other than a director elected by the holders of Beacon Preferred Shares
and Beacon Parity Shares, fill any vacancies on the Beacon Board. Vacancies
created by the removal of a director other than a director elected by the
holders of Beacon Preferred Shares and Beacon Parity Shares shall be filled by
the affirmative vote of two-thirds of the shares then outstanding and entitled
to vote generally in the election of directors.
 
     Whenever dividends on the Beacon Preferred Shares are in arrears for six or
more quarterly periods, holders of the Beacon Preferred Shares will be entitled
to vote separately as a class with the holders of all Beacon Parity Shares for
the election of two additional directors of Beacon. Such election shall be held
at a special meeting called by the holders of record of at least 20% of the
outstanding Beacon Preferred Shares or the outstanding Beacon Parity Shares or,
if the request for a special meeting is received by Beacon less than 90 days
prior to the next annual or special meeting of shareholders, at the next annual
or such special meeting of shareholders and at each subsequent annual meeting of
shareholders until all arrearages and the dividend for the then current dividend
period shall have been fully paid or a sum sufficient for the full payment
thereof shall have been set aside. Vacancies for directors elected by the
holders of Beacon Preferred Shares and Beacon Parity Shares shall be filled by
the written consent of the remaining director elected by such holders then in
office, or if there is no such remaining director, by vote of holders of a
majority of the outstanding Beacon Preferred Shares and the outstanding Beacon
Parity Shares voting together as a single class.
 
     As permitted by the Beacon Articles, with the exception of any members
elected by holders of Beacon Preferred Shares and Beacon Parity Shares, the
Beacon Board is divided into three classes of directors. The terms of the
current directors' first, second and third classes expire in 1998 (three
directors), 1999 (two directors) and 2000 (two directors), respectively.
Directors of each class are chosen for three-year terms upon the expiration of
their current terms and each year one class of directors is elected by the
Beacon Shareholders.
 
     A director other than a director elected by the holders of Beacon Preferred
Shares and Beacon Parity Shares may be removed only with cause by the
affirmative vote of shareholders holding not less than two-thirds of all shares
then outstanding and entitled to vote in the election of directors.
 
                                       185
<PAGE>   194
 
ANTI-TAKEOVER PROVISIONS
 
     Certain provisions of Maryland law, EOP's Declaration of Trust and the
Beacon Articles, including without limitation those discussed below and
provisions relating to the classification of the EOP and Beacon Boards,
restrictions on the ability of shareholders to remove trustees or directors and
restrictions on shareholder nominations of trustees or directors or other
proposals (see "-- Trustees/Directors" above and "-- Shareholder Meetings"
below), may discourage an attempt to acquire control of EOP or Beacon,
respectively, that a majority of either entity's shareholders determined was in
their best interests. These provisions also may render the removal of one or all
trustees or directors more difficult or deter or delay a change of control that
the EOP Board or Beacon Board, respectively, did not approve. Provisions of
EOP's Declaration of Trust and Beacon Articles intended to preserve qualified
REIT status under the Code may have similar or comparable effects. See "-- REIT
Qualification Provisions" below.
 
     EOP.  Subject to the approval rights of the holders of EOP Preferred Shares
(see "-- Voting Rights" above), the EOP Board may authorize the issuance of
preferred shares at such times, for such purposes and for such consideration as
it may deem advisable without further shareholder approval. The rights of
holders of EOP Common Shares are or will be subject to, and may be adversely
affected by, the rights of holders of EOP Preferred Shares and the rights of
holders of any other preferred shares that may be issued in the future. The EOP
Preferred Shares and any other preferred shares which EOP may issue in the
future may adversely affect the interests of holders of EOP Common Shares by
limiting the control that such holders may exert by exercise of their voting
rights, by subordinating their rights in liquidation to the rights of the
holders of such shares, and otherwise. In addition, the existence of the
outstanding EOP Preferred Shares or the future issuance of any other preferred
shares, in some circumstances, may deter or discourage takeover attempts and
other changes in control of EOP by making it more difficult for a person who has
gained a substantial equity interest in EOP to obtain control or to exercise
control effectively. Other than the issuance of EOP Preferred Shares for Beacon
Preferred Shares in the Merger, EOP has no current plans or agreements with
respect to the issuance of any EOP Preferred Shares.
 
     BEACON.  Subject to the approval rights of the holders of Beacon Preferred
Shares (see "-- Voting Rights" above), the Beacon Board may authorize the
issuance of preferred shares at such times, for such purposes and for such
consideration as it may deem advisable without further shareholder approval. The
rights of holders of Beacon Common Shares are or will be subject to, and may be
adversely affected by, the rights of holders of Beacon Preferred Shares and the
rights of holders of any other preferred shares that may be issued in the
future. The Beacon Preferred Shares and any other preferred shares which Beacon
may issue in the future may adversely affect the interests of holders of Beacon
Common Shares by limiting the control that such holders may exert by exercise of
their voting rights, by subordinating their rights in liquidation to the rights
of the holders of such shares, and otherwise. In addition, the existence of the
outstanding Beacon Preferred Shares or the future issuance of any other
preferred shares, in some circumstances, may deter or discourage takeover
attempts and other changes in control of Beacon by making it more difficult for
a person who has gained a substantial equity interest in Beacon to obtain
control or to exercise control effectively. Beacon has no current plans or
agreements with respect to the issuance of any preferred shares, including
additional Beacon Preferred Shares.
 
     MARYLAND CONTROL SHARE ACQUISITION STATUTE.  The MGCL, as applicable to
real estate investment trusts as well as corporations, provides that Control
Shares (as defined below) of a Maryland corporation acquired in a "Control Share
Acquisition" have no voting rights except to the extent approved by a vote of
two-thirds of the votes entitled to be cast on the matter, excluding shares
owned by the acquiror, or by officers or by directors or trustees who are
employees of the corporation. "Control Shares" are voting shares which, if
aggregated with all other such shares previously acquired by the acquiror, or in
respect of which the acquiror is able to exercise or direct the exercise of
voting power (except solely by virtue of a revocable proxy), would entitle the
acquiror, directly or indirectly, to exercise or direct the exercise of voting
power in electing directors or trustees within one of the following ranges of
voting power: (i) one-fifth or more but less than one-third of all voting power,
(ii) one-third or more but less than a majority of all voting power or (iii) a
majority or more of all voting power. Control Shares do not include shares the
acquiring person is then entitled to vote as a result of having previously
obtained shareholder approval. A "Control Share Acquisition" means the direct or
 
                                       186
<PAGE>   195
 
indirect acquisition by any person, of ownership of, or the power to direct the
exercise of voting power with respect to, issued and outstanding Control Shares.
A person who has made or proposes to make a Control Share Acquisition, upon
satisfaction of certain conditions (including an undertaking to pay certain of
the corporation's or trust's expenses), may compel the board of directors or
trustees of a Maryland corporation or trust to call a special meeting of
shareholders to be held within 50 days of demand to consider the voting rights
of the shares. If no request for a meeting is made, the corporation or trust may
itself present the question at any shareholders meeting. If voting rights are
not approved at the meeting or if the acquiring person does not deliver an
acquiring person statement as required by the MGCL, then, subject to certain
conditions and limitations, the corporation or trust may redeem any or all of
the Control Shares (except those for which voting rights have previously been
approved) for fair value determined, without regard to the absence of voting
rights for the Control Shares, as of the date of the last Control Share
Acquisition by the acquiror or, if a meeting is held, as of the date of any
meeting of shareholders at which the voting rights of such shares are considered
and not approved. If voting rights for Control Shares are approved at a
shareholders meeting and the acquiror becomes entitled to vote a majority of the
shares entitled to vote, all other shareholders may exercise appraisal rights.
The fair value of the shares as determined for purposes of such appraisal rights
may not be less than the highest price per share paid by the acquiror in the
Control Share Acquisition. The Control Share Acquisition statute does not apply
(a) to shares acquired in a merger, consolidation or share exchange if the
Maryland corporation or trust is a party to the transaction or (b) to
acquisitions approved or exempted by the articles of incorporation, declaration
of trust or bylaws of the Maryland corporation or trust. The EOP Bylaws contain
a provision exempting from the control share acquisition statute any acquisition
by any person of shares of beneficial interest of EOP. There can be no assurance
that such provision will not be amended or eliminated retroactively and/or
prospectively, at any time in the future. The Beacon Articles and Bylaws contain
provisions exempting from the control share acquisition statute any share of
Beacon beneficially held by Alan M. Leventhal, Norman B. Leventhal, Mark S.
Leventhal, Edwin N. Sidman, Paula L. Sidman, Lionel P. Fortin, Douglas S.
Mitchell, Robert J. Perriello and James M. Becker. In addition, the Beacon
Bylaws exempt current or future affiliates, associates, or other persons acting
in concert or as a group with any of the foregoing persons.
 
     MARYLAND BUSINESS COMBINATION STATUTE. Under the MGCL, certain "business
combinations" between a Maryland corporation or trust and an Interested
Shareholder are prohibited for five years after the most recent date on which
the Interested Shareholder becomes an Interested Shareholder. Thereafter, any
such business combination must be recommended by the board of directors of the
corporation and approved by the affirmative vote of at least (a) 80% of the
votes entitled to be cast by holders of outstanding voting stock of the
corporation and (b) two-thirds of the votes entitled to be cast by holders of
voting stock of the corporation other than shares held by the Interested
Shareholder with whom (or with whose affiliate) the business combination is to
be effected, unless, among other conditions, the Maryland corporation's or
trust's common shareholders receive a minimum price (as defined in the MGCL) for
their shares and the consideration is received in cash or in the same form as
previously paid by the Interested Shareholder for its shares. These provisions
of Maryland law do not apply, however, to business combinations that are
approved or exempted by the board of directors or trustees of the corporation or
trust prior to the time that the Interested Shareholder becomes an Interested
Shareholder. See "RISK FACTORS -- Limitations on Changes in Control and of
Ownership Limit -- Possible Limitations on Changes in Control Pursuant to
Maryland Law." The EOP Board has elected to opt out of the business combination
statute. The Beacon Articles contain a provision expressly electing not to be
governed by the Maryland business combination statute with respect to any
business combination (as defined in the statute) involving Alan M. Leventhal,
Norman B. Leventhal, Mark S. Leventhal, Edwin N. Sidman, Paula L. Sidman, Lionel
P. Fortin, Douglas S. Mitchell, Robert J. Perriello and James M. Becker, or
current or future affiliates, associates (as such terms are defined in the
statute) or other persons acting in concert as a group with any of the foregoing
persons.
 
REIT QUALIFICATION PROVISIONS
 
     EOP.  In order to assist in preserving EOP's status as a REIT under the
Code, the Declaration of Trust provides that no holder of EOP Shares may own, or
be deemed to own by virtue of the attribution provisions of the Code, more than
the EOP Ownership Limit or such higher percentage applicable to such holder
approved
 
                                       187
<PAGE>   196
 
by the EOP Board (in value or number of shares, whichever is more restrictive)
(the "Excepted Holder Limit"). The EOP Board, in its sole and absolute
discretion, may grant to any holder of EOP Shares an Excepted Holder Limit
subject to satisfaction of certain conditions set forth in the Declaration of
Trust. The EOP Board is required to waive or modify the EOP Ownership Limit with
respect to one or more persons who would not be treated as "individuals" for
purposes of the Code if such person submits to the EOP Board information
satisfactory to the EOP Board, in its reasonable discretion, demonstrating that
(i) such person is not an individual for purposes of the Code, (ii) such
ownership will not cause a person who is an individual to be treated as owning
EOP Shares in excess of the EOP Ownership Limit, applying the applicable
constructive ownership rules, and (iii) such ownership will not otherwise
jeopardize EOP's status as a REIT. As a condition of such waiver, the EOP Board
may, in its reasonable discretion, require undertakings or representations from
the applicant to ensure that the conditions in clauses, (i), (ii) and (iii) of
the preceding sentence are satisfied and will continue to be satisfied as long
as such person owns shares in excess of the EOP Ownership Limit. The EOP Board
may reduce the Excepted Holder Limit of any holder of EOP Shares only with such
holder's written consent or pursuant to any agreements made between EOP and such
holder at the time such Excepted Holder Limit was granted, provided that no
Excepted Holder Limit may be reduced to a percentage that is less than the EOP
Ownership Limit. The EOP Board has the authority to increase the EOP Ownership
Limit from time to time, but does not have the authority to do so to the extent
that after giving effect to such increase, five beneficial owners of EOP Shares
could beneficially own in the aggregate more than 49.5% of the outstanding EOP
Shares.
 
     Any transfer (including any issuance, sale, transfer, gift, assignment,
devise or other disposition) of EOP Shares that would: (i) result in a holder
holding a number of EOP Shares in excess of the EOP Ownership Limit or the
Excepted Holder Limit, whichever is applicable, (ii) result in EOP being
"closely held" within the meaning of Section 856(h) of the Code, (iii) result in
the disqualification of EOP as a REIT or (iv) result in the outstanding EOP
Shares being owned by fewer than 100 persons or entities will be void and of no
force or effect with respect to the purported transferee and any person or
entity who would have been the record holder of such EOP Shares as a result of
such transfer (collectively, the "Prohibited Owner"), in the case of the
foregoing clauses (i), (ii) and (iii), as to that number of EOP Shares that
exceeds the EOP Ownership Limit or the Excepted Holder Limit, as applicable
(referred to as "excess shares"), and in the case of the foregoing clause (iv),
as to all of the EOP Shares purported to be transferred, and the Prohibited
Owner shall acquire no right or interest therein. Any such excess shares
described above will be transferred automatically to a trust (the "Charitable
Trust"), the beneficiary of which will be a qualified charitable organization
selected by EOP (the "Charitable Beneficiary"). Such transfer shall be deemed to
be effective as of the close of business on the business day prior to the
purported transfer. If any such transfer to the Charitable Trust is not
effective for any reason, the transfer of such excess shares will be void.
 
     Any person or entity who acquires or intends to acquire EOP Shares that
will or may violate the foregoing provisions must immediately notify EOP of such
acquisition, or give EOP 15 days prior notice thereof, and must provide EOP such
other information as EOP may request in order to determine the effect of such
acquisition of EOP's status as a REIT.
 
     Subject to the purchase rights of EOP described below, within 20 days of
receiving notice from EOP of the transfer of shares to the Charitable Trust, the
trustee of the Charitable Trust (who shall be designated by EOP, subject to
certain requirements in the Declaration of Trust) (the "Charitable Trustee")
will be required to sell such excess shares to a person or entity, including
without limitation EOP, who could own such shares without violating the
restrictions described above, and distribute to the Prohibited Owner an amount
equal to the lesser of (i) the price paid by the Prohibited Owner for such
excess shares, or if no payment was made in respect thereof, the market price of
such excess shares, as determined pursuant to the Declaration of Trust (the "EOP
Market Price") on the date on which such shares became excess shares and (ii)
the sales proceeds received by the Charitable Trustee for such excess shares.
Any proceeds in excess of the amount distributable to the Prohibited Owner will
be distributed to the Charitable Beneficiary.
 
     Excess shares transferred to the Charitable Trust shall be deemed to have
been offered for sale to EOP, or its designee, at a price per share equal to the
lesser of (i) the price per share in the transaction that resulted in such
transfer to the Charitable Trust (or, in the case of a devise or gift, the EOP
Market Price at the time of
 
                                       188
<PAGE>   197
 
such devise or gift) and (ii) the EOP Market Price of such shares on the date
EOP, or its designee, accepts such offer. EOP shall have the right to accept
such offer until the Charitable Trustee has sold such excess shares as described
above. Upon a sale of such excess shares to EOP, the interest of the Charitable
Beneficiary in such excess shares shall terminate and the Charitable Trustee
shall distribute the net proceeds of the sale to the Prohibited Owner.
 
     Prior to a sale of any excess shares by the Charitable Trust, the
Charitable Trustee shall have all voting rights and rights to dividends or other
distributions (including distributions upon liquidation, dissolution or winding
up of EOP or any distributions of assets of EOP) with respect to such excess
shares. Any dividend or other distribution paid to the Prohibited Owner prior to
the discovery by EOP that such excess shares had been transferred to the
Charitable Trust must be paid by the Prohibited Owner to the Charitable Trustee
upon demand. Subject to applicable law, effective as of the date that any excess
shares have been transferred to the Charitable Trust, the Charitable Trustee
shall have the authority in its sole discretion (i) to rescind as void any vote
cast by a Prohibited Owner prior to the discovery by EOP that such excess shares
have been transferred to the Charitable Trust and (ii) to recast such vote in
accordance with the instructions of the Charitable Trustee. Notwithstanding the
foregoing, if EOP has already taken irreversible action with respect to matters
covered by such vote, the Charitable Trustee shall not have the authority to
rescind and recast such vote.
 
     The foregoing restrictions on transferability and ownership will not apply
if the EOP Board determines that they are no longer required in order for EOP to
continue to qualify as a REIT.
 
     All persons or entities who own, directly or by virtue of the attribution
provisions of the Code, more than 5% (or such other percentage between 0.5% and
5% as provided in the rules and regulations promulgated under the Code) of the
lesser of the number or value of the outstanding EOP Shares must give a written
notice to EOP by January 30 of each year stating the name and address of such
owner, the number of EOP Shares owned and a description of the manner in which
such EOP Shares are held; in addition, a holder of record of EOP Shares subject
to the foregoing requirement who holds such EOP Shares as nominee for another
person or entity which is required to include in gross income the dividends
received on such shares must also give notice of the name and address of such
person or entity and the number of EOP Shares of such person or entity with
respect to which such holder of record is nominee. In addition, each record,
beneficial and constructive holder of EOP Shares shall, upon demand of EOP, be
required to disclose to EOP in writing any information with respect to the
direct, indirect and constructive ownership thereof as the EOP Board deems
necessary to comply with the provisions of the Code applicable to REITs, to
comply with the requirements of any taxing authority or governmental agency or
to determine any such compliance.
 
     BEACON.  In order to assist in preserving Beacon's status as a REIT under
the Code, the Beacon Articles provide that no person or entity may directly or
indirectly acquire or hold a beneficial ownership interest (determined in
accordance with the attribution rules applicable to ownership of REIT shares
under the Code) in any class or series of stock of Beacon (the "Beacon Shares")
with an aggregate value in excess of 6% of the aggregate value of all
outstanding Beacon Shares (the 6% Ownership Limit). Any entity, the ownership of
whose Beacon Shares is attributed to the owners of such entity under Sections
544 and 856(h) of the Code, will be "looked through" for purposes of the 6%
Ownership Limit. No such entities may directly or indirectly acquire or hold
beneficial ownership of Beacon Shares of any class or series with an aggregate
value in excess of 9.9% of the aggregate value of all outstanding Beacon Shares
(the "Look Through Ownership Limit" and together with the 6% Ownership Limit,
the "Beacon Ownership Limit"). Notwithstanding the foregoing, the Beacon Board
may, in its sole discretion, waive the Beacon Ownership Limit with respect to
any person or entity or any transaction if it is satisfied, based on the advice
of tax counsel, that ownership in excess of this limit will not jeopardize
Beacon's status as a REIT and it otherwise decides that such action is in the
best interest of Beacon. The Beacon Board may also, in its sole discretion,
revoke certain waivers of the Beacon Ownership Limit previously granted.
 
     Unless waived by the Beacon Board as described above, if any person or
entity holds a number of shares of Beacon Shares in excess of the Beacon
Ownership Limit, such number of shares in excess of the Beacon Ownership Limit
will automatically be deemed to have been converted into Beacon Excess Shares
and
 
                                       189
<PAGE>   198
 
transferred by such person or entity (the "Transferor") to Beacon as trustee of
a separate trust for the exclusive benefit of the persons or entities to whom
such shares can ultimately be transferred without violating the Beacon Ownership
Limit (the "Eligible Transferee"). Beacon Excess Shares may not be voted and are
not entitled to distributions or dividends, other than distributions upon
liquidation, dissolution or winding up of Beacon (see "-- Liquidation
Rights -- Beacon" below). Upon transfer to one or more Eligible Transferees,
such Beacon Excess Shares are reconverted to shares of Beacon Shares of the same
class or series from which they were converted to Beacon Excess Shares, with all
rights appurtenant thereto.
 
     Subject to the purchase rights of Beacon described below, the interest in
any trust holding Beacon Excess Shares may be transferred to one or more
Eligible Transferees designated by the Transferor if the Transferor does not
receive a price for the trust interest in excess of (i) the price the Transferor
paid for the Beacon Shares in the purported transfer of Beacon Shares that
resulted in the Beacon Excess Shares represented by the trust interest or (ii)
if the Transferor did not pay for such Beacon Shares (e.g., the shares were
received through a gift, devise or other similar transaction), the price equal
to the aggregate market price determined pursuant to the Beacon Articles (the
"Beacon Market Price") of the Beacon Shares that resulted in the Beacon Excess
Shares represented by the trust interest on the day of the purported transfer
thereof. Upon transfer of such trust interest to one or more Eligible
Transferees, the Beacon Excess Shares subject to such trust interest shall be
reconverted to shares of Beacon Stock of the same class or series from which
they were converted to Beacon Excess Shares, with all rights appurtenant
thereto, and be distributed to such Eligible Transferees.
 
     All Beacon Excess Shares shall be deemed to have been offered for sale to
Beacon, or its designee, at a price per share equal to the lesser of (i) the
price per Beacon Share in the transaction that created such Beacon Excess Shares
(or, in the case of devise or gift, the Beacon Market Price per share of such
Beacon Shares at the time of such devise or gift) and (ii) the Beacon Market
Price per Beacon Share of the class of Beacon Shares from which such Beacon
Excess Shares were converted on the date Beacon, or its designee, accepts such
offer. Beacon shall have the right to accept such offer at any time until 90
days after the date on which the Transferor gives written notice to Beacon of
any event or any purported transfer that results in the conversion of Beacon
Shares into Beacon Excess Shares and the nature and amount of all ownership
interests, direct or indirect, of record or beneficial, of such Transferor, or,
if no such notice is given, the date the Beacon Board determines that a
purported transfer resulting in the conversion of Beacon Shares into Beacon
Excess Shares has been made. Unless the Beacon Board determines that it is in
the interest of Beacon to make earlier payment thereof to the Transferor, the
redemption payment shall be paid, without interest, only upon liquidation of
Beacon and shall not exceed an amount equal to the lesser of (i) the price
described in the first sentence of this paragraph and (ii) the sum of the per
share distributions designated as liquidating distributions and return of
capital distributions declared subsequent to the redemption date with respect to
unredeemed shares of Beacon Shares of the class from which the redeemed Beacon
Excess Shares were converted.
 
     In addition to the foregoing restrictions, Beacon Shareholders and their
transferees are or may be required to disclose to Beacon information relating to
ownership of Beacon Shares whenever the Beacon Board deems it reasonably
necessary to protect Beacon's status as a REIT, and the Beacon Board may refuse
to permit a transfer of Beacon Shares if in its opinion such transfer would
jeopardize the qualification of Beacon as a REIT.
 
     If the Beacon Board determines that it is no longer in the best interests
of Beacon and its shareholders to continue to have Beacon qualify as a REIT, the
Beacon Board may revoke or otherwise terminate Beacon's REIT election pursuant
to Section 856(g) of the Code and the foregoing restrictions shall no longer
apply.
 
PREEMPTIVE RIGHTS
 
     Neither the holders of EOP Common Shares nor the holders of EOP Preferred
Shares, on the one hand, nor holders of Beacon Common Shares nor the holders of
Beacon Preferred Shares, on the other hand, have preemptive rights. Thus, if
additional EOP Common Shares, EOP Preferred Shares, Beacon Common Shares
 
                                       190
<PAGE>   199
 
or Beacon Preferred Shares were issued, the proportions of capital stock
ownership of the holders thereof would be reduced, to the extent they did not
participate in such additional issuance of shares.
 
ASSESSMENT
 
     All outstanding EOP Common Shares are, all EOP Common Shares and EOP
Preferred Shares to be issued pursuant in the Merger will be, and, when issued,
all EOP Common Shares reserved for issuance upon redemption of EOP Partnership
Units to be issued in the Partnership Merger, will be, fully paid and
nonassessable.
 
     The Beacon Common Shares and the Beacon Preferred Shares presently
outstanding are fully paid and nonassessable.
 
CONVERSION; REDEMPTION; SINKING FUND
 
     GENERAL.  Neither the EOP Common Shares, the EOP Preferred Shares, the
Beacon Common Shares, the Beacon Preferred Shares nor the Beacon Excess Shares
are convertible, redeemable or entitled to the benefit of any sinking fund,
except that the EOP Common Shares and the EOP Preferred Shares may be purchased
by EOP under certain provisions of EOP's Declaration of Trust designed to enable
EOP to preserve its status as a REIT under the Code, (see "-- REIT Qualification
Provisions -- EOP" above) and the Beacon Common Shares and the Beacon Preferred
Shares shall be converted into Beacon Excess Shares and vice versa and the
Beacon Excess Shares may be redeemed by Beacon, in each case under certain
provisions of the Beacon Articles designed to enable Beacon to preserve its
status as a REIT under the Code (see "-- REIT Qualification
Provisions -- Beacon" above) and the EOP Preferred Shares and the Beacon
Preferred Shares may be redeemed by EOP and Beacon, respectively, as described
below.
 
     EOP PREFERRED SHARES.  On and after June 15, 2002, EOP, at its option and
upon not less than 30 nor more than 60 days' written notice, may redeem the
outstanding EOP Preferred Shares, in whole or part, at any time or from time to
time, for cash at a redemption price of $25.00 per share, plus all accrued and
unpaid distributions thereon to the date fixed for redemption, without interest,
subject to the following limitations and to compliance by EOP with the
procedural requirements applicable to the redemption of EOP Preferred Shares.
First, if less than all of the outstanding EOP Preferred Shares are to be
redeemed, the EOP Preferred Shares to be redeemed shall be selected pro rata (as
nearly as may be practicable without creating fractional shares) or by any other
equitable method determined by EOP. Second, the redemption price of EOP
Preferred Shares (other than the portion thereof consisting of accrued and
unpaid distributions) is payable solely out of the sale proceeds of other equity
securities of EOP and any rights (other than debt securities convertible into or
exchangeable for such equity securities) or options to purchase any of the
foregoing. Third, unless full cumulative distributions on all EOP Preferred
Shares have been or contemporaneously are authorized and paid or authorized and
a sum sufficient for the payment thereof set apart for all past distribution
periods and the then current distribution period, no EOP Preferred Shares shall
be redeemed unless all outstanding EOP Preferred Shares are simultaneously
redeemed, and EOP shall not purchase or otherwise acquire directly or indirectly
any EOP Preferred Shares (except by exchange for shares of EOP ranking junior to
the EOP Preferred Shares as to distributions and upon liquidation (the "EOP
Junior Shares"); provided, however, that the foregoing shall not prevent the
purchase by EOP of EOP Preferred Shares in order to ensure that EOP remains
qualified as a REIT for federal income tax purposes or the purchase or
acquisition of EOP Preferred Shares pursuant to a purchase or exchange offer
made on the same terms to holders of all outstanding EOP Preferred Shares.
 
     Any EOP Preferred Shares that have been redeemed shall, after such
redemption, have the status of authorized but unissued preferred shares of
beneficial interest, without designation as to series until such shares are once
more designated as part of a particular series by the EOP Board.
 
     BEACON PREFERRED SHARES.  On and after June 15, 2002, Beacon, at its option
and upon not less than 30 nor more than 60 days' written notice, may redeem the
outstanding Beacon Preferred Shares, in whole or part, at any time or from time
to time, for cash at a redemption price of $25.00 per share, plus all accrued
and unpaid distributions thereon to the date fixed for redemption, without
interest, subject to the following
 
                                       191
<PAGE>   200
 
limitations and to compliance by Beacon with the procedural requirements
applicable to the redemption of Beacon Preferred Shares. First, if less than all
of the outstanding Beacon Preferred Shares are to be redeemed, the Beacon
Preferred Shares to be redeemed shall be selected pro rata (as nearly as may be
practicable without creating fractional shares) or by any other equitable method
determined by Beacon. Second, the redemption price of Beacon Preferred Shares
(other than the portion thereof consisting of accrued and unpaid distributions)
is payable solely out of the sale proceeds of other equity securities of Beacon
and any rights (other than debt securities convertible into or exchangeable for
such equity securities) or options to purchase any of the foregoing. Third,
unless full cumulative distributions on all Beacon Preferred Shares have been or
contemporaneously are authorized and paid or authorized and a sum sufficient for
the payment thereof set apart for all past dividend periods and the then current
dividend period, no Beacon Preferred Shares shall be redeemed unless all
outstanding Beacon Preferred Shares are simultaneously redeemed, and Beacon
shall not purchase or otherwise acquire directly or indirectly any Beacon
Preferred Shares (except by exchange for shares of Beacon ranking junior to the
Beacon Preferred Shares as to dividends and upon liquidation (the "Beacon Junior
Shares")) provided, however, that the foregoing shall not prevent the purchase
by Beacon of Beacon Excess Shares in order to ensure that Beacon remains
qualified as a REIT for federal income tax purposes or the purchase or
acquisition of Beacon Preferred Shares pursuant to a purchase or exchange offer
made on the same terms to holders of all outstanding Beacon Preferred Shares.
 
     Any Beacon Preferred Shares that have been redeemed shall, after such
redemption, have the status of authorized but unissued preferred shares without
designation as to series until such shares are once more designated as part of a
particular series by the Beacon Board.
 
LIQUIDATION RIGHTS
 
     EOP.  In the event of any voluntary or involuntary liquidation, dissolution
or winding-up of the affairs of EOP, holders of outstanding EOP Common Shares
are entitled to share, in proportion to their respective interests, in EOP's
assets and funds remaining after payment, or provision for payment, of all debts
and other liabilities of EOP, including without limitations all obligations of
EOP with respect to any outstanding EOP Preferred Shares. Conversely, in the
event of any voluntary or involuntary liquidation, dissolution or winding up of
EOP, the holders of any outstanding EOP Preferred Shares will be entitled to
receive out of the assets of EOP available for distribution to shareholders
remaining after payment or provision for payment of all debts and other
liabilities of EOP other than EOP's obligations with respect to any outstanding
EOP Junior Shares, a liquidation preference of $25.00 per share, plus an amount
equal to any accrued and unpaid distributions to the date of payment.
 
     If upon any voluntary or involuntary liquidation, dissolution or winding up
of EOP, the assets of EOP shall be insufficient to make such full payments to
holders of EOP Preferred Shares, then such assets shall be distributed pro rata
among holders of EOP Preferred Shares. After payment of the full amount of the
liquidating distribution to which they are entitled, the holders of EOP
Preferred Shares will not be entitled to any further participation in any
distribution of assets by EOP. Neither a consolidation or merger of EOP with or
into another corporation nor a merger of another corporation with or into EOP
nor a sale, lease or conveyance of all or substantially all of EOP's property or
business shall be considered a liquidation, dissolution or winding up of EOP.
 
     BEACON.  In the event of any voluntary or involuntary liquidation,
dissolution or winding-up of the affairs of Beacon, holders of outstanding
Beacon Common Shares and Beacon Excess Shares are entitled to share, in
proportion to their respective interests, in Beacon's assets and funds remaining
after payment, or provision for payment, of all debts and other liabilities of
Beacon, including without limitations all obligations of Beacon with respect to
any outstanding Beacon Preferred Shares. Conversely, in the event of any
voluntary or involuntary liquidation, dissolution or winding up of Beacon, the
holders of any outstanding Beacon Preferred Shares will be entitled to receive
out of the assets of Beacon available for distribution to shareholders remaining
after payment or provision for payment of all debts and other liabilities of
Beacon other than Beacon's obligations with respect to any outstanding Beacon
Junior Shares, a liquidation preference of $25.00 per share, plus an amount
equal to any accrued and unpaid dividends to the date of payment.
 
                                       192
<PAGE>   201
 
     If upon any voluntary or involuntary liquidation, dissolution or winding up
of Beacon, the assets of Beacon shall be insufficient to make such full payments
to holders of Beacon Preferred Shares, then such assets shall be distributed pro
rata among holders of Beacon Preferred Shares. After payment of the full amount
of the liquidating distribution to which they are entitled, the holders of
Beacon Preferred Shares will not be entitled to any further participation in any
distribution of assets by Beacon. Neither a consolidation or merger of Beacon
with or into another corporation nor a merger of another corporation with or
into Beacon nor a sale, lease or conveyance of all or substantially all of
Beacon's property or business shall be considered a liquidation, dissolution or
winding up of Beacon.
 
DISTRIBUTIONS
 
     In order to remain qualified as a REIT under the Code, each of EOP and
Beacon must distribute to its shareholders at least 95% of its taxable income
(other than net capital gain) annually. See "FEDERAL INCOME TAX
CONSIDERATIONS -- Requirements for Qualification as a REIT -- Annual
Distribution Requirements Applicable to REITs." Under the MGCL, a dividend or
other distribution may not be made if after giving effect to it (i) the
corporation would not be able to pay its debts as they become due in the usual
course of business or (ii) the corporation's total assets would be less than the
corporation's total liabilities plus (unless the corporation's charter permits
otherwise) the amount that would be needed, if the corporation were to be
dissolved at the time of the distribution, to satisfy the preferential rights
upon dissolution of stockholders whose preferential rights upon dissolution are
superior to those receiving the distribution. Under the Maryland REIT Law and
the EOP Declaration of Trust, there are no similar limits on the payment of
dividends or other distributions; however, a Maryland court could refer to the
MGCL in its decision as to the validity of a dividend or distribution made by a
trust REIT, such as EOP.
 
     EOP.  Holders of EOP Common Shares are entitled to cash distributions when,
if and as declared by the EOP Board. There can be no assurance as to the payment
of distributions on EOP Common Shares in the future because such payment will
depend upon the earnings and financial condition of EOP, as well as other
related factors. The Declaration of Trust permits the issuance of preferred
shares of beneficial interest having the right to receive distributions before
distributions on the EOP Common Shares are declared or paid. The EOP Preferred
Shares have such preferential distribution rights, as described below.
 
     Holders of EOP Preferred Shares shall be entitled to receive, when and as
authorized by the EOP Board, out of funds legally available for the payment of
distributions, cumulative preferential cash distributions at the rate of 8.98%
of the $25.00 liquidation preference per annum (equivalent to a fixed annual
amount of $2.245 per share). Such distributions shall be cumulative and shall be
payable quarterly in arrears on or before March 15, June 15, September 15 and
December 15 of each year or, if not a business day, the next succeeding business
day. Distributions will be computed on the basis of a 360-day year consisting of
twelve 30-day months. Distributions will be payable to the holders of record of
EOP Preferred Shares as they appear in the share records of EOP at the close of
business on the applicable record date, which shall be the first day of the
calendar month in which the applicable distribution payment date falls or such
other date designated by the EOP Board for the payment of distributions that is
not more than 30 nor less than ten days prior to such distribution payment date.
 
     No distributions shall be authorized by the EOP Board or paid or set apart
for payment at such if such authorization, payment or setting apart for payment
would violate any agreement of EOP or is restricted or prohibited by law.
Distributions on the EOP Preferred Shares will, nonetheless, accrue whether or
not any of the foregoing restrictions exist, whether or not there are funds
legally available for the payment thereof and whether or not they are
authorized, and accrued but unpaid distributions will accumulate as of the
distribution payment date on which they first become payable.
 
     Except for pro rata distributions with respect to the EOP Preferred Shares
and any EOP Parity Shares, no distributions on any EOP Parity Shares or EOP
Junior Shares will be authorized, paid or set aside for payment (other than a
distribution payable in EOP Junior Shares) for any period, no other distribution
on any EOP Parity Shares or EOP Junior Shares and no redemption, purchase or
other acquisition for consideration of EOP Parity Shares or EOP Junior Shares
shall be made, in each case unless full cumulative distributions
 
                                       193
<PAGE>   202
 
on the EOP Preferred Shares have been or contemporaneously are authorized and
paid or authorized and a sum sufficient for full payment thereof is set aside.
 
     BEACON.  The holders of Beacon Common Shares are entitled to share ratably
in distributions when and as declared by the Beacon Board out of funds legally
available therefor. The Beacon Articles permit the issuance of preferred shares
having the right to receive distributions before distributions on the Beacon
Common Shares are declared or paid. The Beacon Preferred Shares have such
preferential distribution rights, as described below. The MGCL provides that
Beacon may not pay dividends if after giving effect to the dividend, Beacon
would not be able to pay its indebtedness as the indebtedness becomes due in the
usual course of business or Beacon's total assets would be less than the sum of
its total liabilities plus the amount that would be needed, if Beacon were to be
dissolved at such time, to satisfy any preferential rights upon dissolution held
by its shareholders whose preferential rights are superior to those receiving
the dividend.
 
     Holders of Beacon Preferred Shares are entitled to receive, when and as
authorized by the Beacon Board, out of funds legally available for the payment
of dividends, cumulative preferential cash dividends at the rate of 8.98% of the
$25.00 liquidation preference per annum (equivalent to a fixed annual amount of
$2.245 per share). Such dividends are cumulative from the date of issuance and
are payable quarterly in arrears on or before March 15, June 15, September 15
and December 15 of each year or, if not a business day, the next succeeding
business day. Dividends are computed on the basis of a 360-day year consisting
of twelve 30-day months. Dividends are payable to the holders of record of
Beacon Preferred Shares as they appear in the share records of Beacon at the
close of business on the applicable record date, which shall be the first day of
the calendar month in which the applicable dividend payment date falls or such
other date designated by the Beacon Board for the payment of dividends that is
not more than 30 nor less than ten days prior to such dividend payment date.
 
     No dividends shall be authorized by the Beacon Board or paid or set apart
for payment at such if such authorization, payment or setting apart for payment
would violate any agreement of Beacon or is restricted or prohibited by law.
Dividends on the Beacon Preferred Shares will, nonetheless, accrue whether or
not any of the foregoing restrictions exist, whether or not there are funds
legally available for the payment thereof and whether or not they are
authorized, and accrued but unpaid dividends will accumulate as of the dividend
payment date on which they first become payable.
 
     Except for pro rata dividends with respect to the Beacon Preferred Shares
and any Beacon Parity Shares, no dividends on any Beacon Parity Shares or Beacon
Junior Shares will be authorized, paid or set aside for payment (other than a
dividend payable in Beacon Junior Shares) for any period, no other distribution
on any Beacon Parity Shares or Beacon Junior Shares and no redemption, purchase
or other acquisition for consideration of Beacon Parity Shares or Beacon Junior
Shares shall be made, in each case unless full cumulative dividends on the
Beacon Preferred Shares have been or contemporaneously are authorized and paid
or authorized and a sum sufficient for full payment thereof is set aside.
 
SHAREHOLDER MEETINGS
 
     EOP.  Pursuant to the EOP Bylaws, the Chairman of the Board, or the
President or one-third of the trustees may call special meetings of the
shareholders. Special meetings of shareholders shall also be called by the
Secretary of EOP upon the written request of the holders of shares entitled to
cast not less than a majority of all the votes entitled to be cast at such
meeting. Such request shall state the purpose of such meeting and the matters
proposed to be acted on at such meeting. Within ten days of the receipt of such
a request, the Secretary shall inform such shareholders of the reasonably
estimated cost of preparing and mailing notice of the meeting (including all
proxy materials that may be required in connection therewith) and, upon payment
by such shareholders to EOP of such costs, the Secretary shall, within 30 days
of such payment, or such longer period as may be necessitated by compliance with
any applicable statutory or regulatory requirements, give notice to each
shareholder entitled to notice of the meeting.
 
     Unless requested by shareholders entitled to cast a majority of all the
votes entitled to be cast at such meeting, a special meeting need not be called
to consider any matter which is substantially the same as a matter voted on at
any meeting of the shareholders held during the preceding 12 months.
 
                                       194
<PAGE>   203
 
     The EOP Bylaws provide that (i) with respect to an annual meeting of
shareholders, nominations of persons for election to the EOP Board and the
proposal of business to be considered by shareholders may be made only (A)
pursuant to EOP's notice of the meeting, (B) by, or at the direction of, the EOP
Board or (C) by a shareholder who is entitled to vote at the meeting and has
complied with the advance notice procedures set forth in the EOP Bylaws and (ii)
with respect to special meetings of the shareholders, only the business
specified in EOP's notice of meeting may be brought before the meeting of
shareholders and nominations of persons for election to the EOP Board may be
made only (A) pursuant to EOP's notice of the meeting, (B) by the EOP Board or
(C) provided that the EOP Board has determined that trustees shall be elected at
such meeting, by a shareholder who is entitled to vote at the meeting and has
complied with the advance notice provisions set forth in the EOP Bylaws.
 
     Not less than ten nor more than 90 days before each meeting of
shareholders, the Secretary shall give to each shareholder entitled to vote at
such meeting and to each shareholder not entitled to vote but who is entitled to
notice of the meeting written or printed notice stating the time and place of
the meeting and, in the case of a special meeting or as otherwise may be
required by any statute, the purpose for which the meeting is called. At any
meeting of shareholders, the presence in person or by proxy of shareholders
entitled to cast a majority of all the votes entitled to be cast at such meeting
shall constitute a quorum; but this requirement shall not affect any requirement
under any statute or the Declaration of Trust for the vote necessary for the
adoption of any measure. If such quorum is not present at any meeting of the
shareholders, the shareholders entitled to vote at such meeting, present in
person or by proxy, shall have the power to adjourn the meeting from time to
time to a date not more than 120 days after the original record date without
notice other than announcement at the meeting. At such adjourned meeting at
which a quorum shall be present, any business may be transacted which might have
been transacted at the meeting as originally notified.
 
     A plurality of all the votes cast at a meeting of shareholders duly called
and at which a quorum is present shall be sufficient to elect a trustee. Each
share may be voted for as many individuals as there are trustees to be elected
and for whose election the share is entitled to be voted. A majority of the
votes cast at a meeting of shareholders duly called and at which a quorum is
present shall be sufficient to approve any other matter which may properly come
before the meeting, unless more than a majority of the votes cast is required by
statute, the Declaration of Trust or the EOP Bylaws. Unless otherwise provided
in the Declaration of Trust, each outstanding share, regardless of class, shall
be entitled to one vote on each matter submitted to a vote at a meeting of
shareholders. A shareholder may cast the votes entitled to be cast by the shares
owned of record by such shareholder either in person or by proxy executed in
writing by the shareholder or by such shareholder's duly authorized attorney in
fact.
 
     Any action required or permitted to be taken at a meeting of shareholders
may be taken without a meeting if a consent in writing, setting forth such
action, is signed by shareholders entitled to cast a sufficient number of votes
to approve the matter, as required by statute, the Declaration of Trust, or the
EOP Bylaws, and such consent is filed with the minutes of proceedings of the
shareholders.
 
     BEACON.  Pursuant to the Beacon Bylaws, the Chairman of the Board, the
President or a majority of the Beacon Board may call special meetings of
shareholders. In addition, the Secretary of Beacon shall call a special meeting
of the shareholders on the written request of shareholders entitled to cast at
least 25% of all the votes entitled to be cast at the meeting. Notwithstanding
the preceding sentence, unless requested by shareholders entitled to cast a
majority of all the votes entitled to be cast at the meeting, a special meeting
need not be called to consider any matter which is substantially the same as a
matter voted on at any special meeting of the shareholders held during the
preceding 12 months.
 
     The Beacon Bylaws provide that (i) with respect to an annual meeting of
shareholders, nominations of persons for election to the Beacon Board may be
made only (A) by the Beacon Board or (B) by a shareholder who is entitled to
vote at the meeting and has complied with the advance notice procedures set
forth in the Beacon Bylaws and (ii) with respect to special meetings of the
shareholders, only the business specified in Beacon's notice of meeting may be
brought before such meeting.
 
     Not fewer than ten nor more than 90 days before each meeting of
shareholders, the Secretary shall give to each shareholder entitled to vote at
such meeting and to each shareholder not entitled to vote who is entitled
 
                                       195
<PAGE>   204
 
to notice of the meeting written or printed notice stating the time and place of
the meeting and, in the case of a special meeting or as otherwise may be
required by any statute, the purpose for which the meeting is called. At any
meeting of shareholders, the presence in person or by proxy of shareholders
entitled to cast a majority of all the votes entitled to be cast at such meeting
shall constitute a quorum; but this requirement shall not affect any requirement
under any statute or the Beacon Articles for the vote necessary for the adoption
of any measure. If such quorum is not present at any meeting of the
shareholders, the shareholders entitled to vote at such meeting, present in
person or by proxy, shall have the power to adjourn the meeting from time to
time. At such adjourned meeting at which a quorum shall be present, any business
may be transacted which might have been transacted at the meeting as originally
notified.
 
     A majority of the votes cast at a meeting of shareholders duly called and
at which a quorum is present shall be sufficient to approve any other matter
which may properly come before the meeting, unless more than a majority of the
votes cast is required by statute, the Beacon Articles or the Beacon Bylaws.
Unless otherwise provided by statute, the Beacon Articles or the Beacon Bylaws,
each outstanding share, regardless of class, shall be entitled to one vote on
each matter submitted to a vote at a meeting of shareholders. A shareholder may
cast the votes entitled to be cast by the shares owned of record by such
shareholder either in person or by proxy executed in writing by the shareholder
or by such shareholder's duly authorized attorney in fact.
 
     Any action required or permitted to be taken at a meeting of shareholders
may be taken without a meeting if a consent in writing, setting forth such
action, is signed by all the shareholders entitled to vote on the subject matter
thereof and any other shareholders entitled to notice of a meeting of
shareholders (but not to vote thereat) have waived in writing any rights which
they may have to dissent from such action, and such consents and waivers are
filed with the minutes of the proceedings of the shareholders.
 
INDEMNIFICATION
 
     EOP.  The Declaration of Trust authorizes EOP, to the maximum extent
permitted by Maryland law, to obligate itself to indemnify and to pay or
reimburse reasonable expenses in advance of final disposition of a proceeding to
(a) any present or former shareholder, trustee or officer or (b) any individual
who, while a trustee of EOP and at the request of EOP, serves or has served as a
director, officer, partner, trustee, employee or agent of another corporation,
partnership, joint venture, trust, employee benefit plan or any other enterprise
from and against any claim or liability to which such person may become subject
or which such person may incur by reason of his or her status as a present or
former trustee, officer or shareholder of EOP. The EOP Bylaws obligate EOP, to
the maximum extent permitted by Maryland law, to indemnify (a) any trustee,
officer or shareholder or any former trustee, officer or shareholder (including
any individual who, while a trustee, officer or shareholder and at the express
request of EOP, serves or has served another corporation, partnership, joint
venture, trust, employee benefit plan or any other enterprise as a director,
officer, shareholder, partner or trustee of such corporation, partnership, joint
venture, trust, employee benefit plan or other enterprise) who has been
successful, on the merits or otherwise, in the defense of a proceeding to which
he was made a party by reason of service in such capacity, against reasonable
expenses incurred by him in connection with the proceeding or (b) any trustee or
officer or any former trustee or officer against any claim or liability to which
he may become subject by reason of such status.
 
     The Maryland REIT Law permits a Maryland real estate investment trust to
indemnify and advance expenses to its trustees, officers, employees and agents
to the same extent as permitted by the MGCL for directors and officers of
Maryland corporations. The MGCL permits a corporation to indemnify its present
and former directors and officers, among others, against judgments, penalties,
fines, settlements and reasonable expenses actually incurred by them in
connection with any proceeding to which they may be made a party by reason of
their service in those or other capacities unless it is established that (a) the
act or omission of the director or officer was material to the matter giving
rise to the proceeding and (i) was committed in bad faith or (ii) was the result
of active and deliberate dishonesty, (b) the director or officer actually
received an improper personal benefit in money, property or services or (c) in
the case of any criminal proceeding, the director or officer had reasonable
cause to believe that the act or omission was unlawful. The foregoing
limitations on indemnification are also expressly set forth in the EOP Bylaws.
However, under the MGCL, a Maryland corporation may not indemnify for an adverse
judgment in a suit by or in the right of the
 
                                       196
<PAGE>   205
 
corporation or for a judgment of liability on the basis that a personal benefit
was improperly received, unless, in either case, a court orders indemnification
and then only for expenses. In addition, the MGCL permits a corporation to
advance reasonable expenses to a director or officer upon the corporation's
receipt of (a) a written affirmation by the director or officer of his good
faith belief that he has met the standard of conduct necessary for
indemnification by the corporation and (b) a written undertaking by or on his
behalf to repay the amount paid or reimbursed by the corporation if it shall
ultimately be determined that the standard of conduct was not met.
 
     BEACON.  Beacon has the power to indemnify, by express provision in the
Beacon Bylaws, by agreement, or by majority vote of either its shareholders or
disinterested directors, any one or more of the following classes of
individuals: (i) present or former directors of Beacon, (ii) present or former
officers of Beacon, (iii) present or former agents and/or employees of Beacon,
(iv) present or former administrators, trustees or other fiduciaries under any
pension, profit sharing, deferred compensation, or other employee benefit plan
maintained by Beacon, and (v) any person serving or who has served at the
request of Beacon in any of these capacities for any other corporation,
partnership, joint venture, trust or other enterprise to the fullest extent
permitted by Maryland statutory or decisional law, as amended or interpreted;
provided, however, that Beacon shall not be obligated to indemnify or advance
expenses to a member of the foregoing classes of individuals (an "Indemnitee")
with respect to proceedings or claims initiated or brought voluntarily by an
Indemnitee and not by way of defense, except with respect to proceedings brought
to establish or enforce a right to indemnification under the Beacon Articles or
any other statute or law or otherwise as provided my the MGCL, but such
indemnification or advancement of expenses may be provided by Beacon in specific
cases if the Beacon Board has approved the initiation or bringing of such suit.
However, Beacon shall not have the power to indemnify any person to the extent
such indemnification would be contrary to Section 2-418 of the MGCL or any
successor provision of Maryland law or any other applicable statute, rule or
regulation. Beacon is obligated to indemnify an Indemnitee's spouse (whether by
statute or at common law and without regard to the location of the governing
jurisdiction) and children to the same extent and subject to the same
limitations applicable to an Indemnitee for claims arising solely out of the
status of such person as a spouse or child of an Indemnitee, including claims
seeking damages from marital property (including community property) or property
held by the Indemnitee and such spouse or child or transferred to such spouse or
child, but such indemnity shall not otherwise extend to protect the spouse
against liabilities caused by the spouse's own acts.
 
     Pursuant to the Beacon Bylaws, Beacon is obligated to indemnify present and
former directors and officers of Beacon and any person who was or is serving at
the request of Beacon as a director or officer of another corporation,
partnership, joint venture, trust or other enterprise, to the full extent
permitted by the MGCL, (i) against expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement (if such settlement is approved
in advance by Beacon, which approval shall not be unreasonably withheld)
actually and reasonably incurred by such person, or such portion thereof as to
which it is determined such person is entitled, in connection with
investigating, preparing for, defending or settling any threatened, pending or
completed action or proceeding, whether civil, administrative or investigative
(other than an action by or in the right of Beacon) by reason of such person's
service as a director or officer of Beacon or, at the request of Beacon, as a
director or officer of another corporation, partnership, joint venture, trust or
other enterprise in which Beacon had, directly or indirectly, an interest at the
time of such service and (ii) against expenses (including attorneys' fees)
actually and reasonably incurred by such person, or such portion thereof as to
which it is determined that such person is entitled, in connection with the
defense or settlement of any threatened, pending or completed action or
proceeding by or in the right of Beacon or any subsidiary of Beacon to procure a
judgment in its favor by reason of such person's service as a director or
officer of Beacon or, at the request of Beacon, as a director or officer of
another corporation, partnership, joint venture, trust or other enterprise in
which Beacon had, directly or indirectly, an interest at the time of such
service, provided that Beacon shall not provide any indemnification for any
director's expenses relating to any willful or grossly negligent failure of a
director to notify the Beacon Board, and under certain circumstances the Beacon
Shareholders, that such director has an interest in an investment opportunity
presented to Beacon. Beacon is also obligated to indemnify the spouse and
children of the foregoing persons (to the extent arising out of the status of
such person as a spouse or child of any of the foregoing persons) with respect
to the matters described in clause (i) of the foregoing sentence. Beacon is
obligated to advance all expenses incurred by the foregoing
 
                                       197
<PAGE>   206
 
persons in connection with the foregoing matters if such persons agree to repay
any such advances if it shall be ultimately determined that such person is not
entitled to the foregoing indemnification.
 
TRUSTEE AND DIRECTOR LIABILITY
 
     As permitted by the Maryland REIT Law and the MGCL, respectively, the
Declaration of Trust and the Beacon Articles eliminate the liability of
trustees, directors and officers of EOP and Beacon, respectively, to EOP and
Beacon, respectively, and their shareholders for money damages except for
liability resulting from (a) actual receipt of an improper benefit or profit in
money, property or service or (b) active and deliberate dishonesty established
by a final judgment as being material to the cause of action.
 
AMENDMENTS TO CONSTITUENT DOCUMENTS
 
     EOP.  The Declaration of Trust may be amended only by the affirmative vote
of the holders of (i) not less than a majority of all the votes entitled to be
cast on the matter, if such action is taken in connection with a transaction,
approval of which requires by law the affirmative vote of shareholders and
pursuant to which EOP's business and assets will be combined with those of one
or more entitles (whether by merger, sale or other transfer of assets,
consolidation or share exchange (a "Business Combination")) or (ii) not less
than two-thirds of all of the votes entitled to be cast on the matter, if such
action is not taken in connection with a Business Combination. However,
amendments relating to changes in the number of authorized EOP Shares require
the approval of holders of a majority of all votes cast at a meeting of
shareholders at which a quorum is present, and, in certain cases, the approval
of holders of two-thirds of the EOP Preferred Shares outstanding at the time.
Under the Maryland REIT Law, a declaration of trust may permit the trustees by a
two-thirds vote to amend the declaration of trust from time to time to qualify
as a REIT under the Code or the Maryland REIT Law without the affirmative vote
or written consent of the shareholders. The Declaration of Trust permits such
action by the EOP Board. Also under the Maryland REIT Law, a declaration of
trust may permit the board of trustees to amend the declaration of trust to
increase the aggregate number of shares of beneficial interest or the number of
shares of any class without shareholder approval. Pursuant to this statute, the
Declaration of Trust authorizes the EOP Board to increase or decrease the
aggregate number of EOP Shares or the number of EOP Shares of any class of
beneficial interest of EOP but requires that such action be approved by the
affirmative vote of a majority of all the votes cast on the matter at a meeting
of shareholders at which a quorum is present, and, in certain cases, be approved
by holders of two-thirds of the EOP Preferred Shares outstanding at the time.
 
     The EOP Bylaws may be amended by the affirmative vote of a majority of the
trustees present at a meeting of trustees duly called and at which a quorum is
present or by written consent of all the trustees, provided, however, that
amendments to provisions of the EOP Bylaws governing shareholder meetings, the
number of trustees, including the number of independent trustees, and the
amendment of the EOP Bylaws may not be amended without the consent of
shareholders by a majority of the votes cast at a meeting of shareholders duly
called and at which a quorum is present.
 
     BEACON.  The Beacon Articles may be amended only by the affirmative votes
of the holders of not less than two-thirds of all the votes entitled to be cast
in the matter and, in certain cases, with the affirmative votes of holders of
not less than two-thirds of the Beacon Preferred Shares outstanding at the time.
 
     The Beacon Bylaws may be amended by the affirmative vote of a majority of
the directors present at a meeting of directors duly called and at which a
quorum is present or by written consent of all the directors or by holders of a
majority of the Beacon Common Shares outstanding at the time, provided, however,
that amendments to provisions of the Beacon Bylaws governing the indemnification
obligations of Beacon may not be amended without the affirmative vote of holders
of a majority of the Beacon Common Shares present at a meeting of Shareholders
duly called and at which a quorum is present and the consent of any indemnified
persons whose rights would be adversely affected by any such amendment and the
provisions of the Beacon Bylaws governing amendment of the Beacon Bylaws may not
be amended without the affirmative vote of holders of a majority of the Beacon
Common Shares present at a meeting duly called and at which a quorum is present.
 
                                       198
<PAGE>   207
 
MERGERS; CONSOLIDATIONS; SALES OF ASSETS
 
     EOP.  Any Business Combination must be approved by the affirmative vote of
holders of not less than a majority of the EOP Common Shares then outstanding
and entitled to be cast on the matter and, in certain cases, by the affirmative
vote of holders of not less than two-thirds of the EOP Preferred Shares then
outstanding.
 
     BEACON.  Any merger or consolidation of Beacon or any sale or all or
substantially all of Beacon's assets must be approved by the affirmative vote of
holders of not less than two-thirds of the Beacon Common Shares then outstanding
and entitled to be cast on the matter and, in certain cases, by the affirmative
vote of holders of not less than two-thirds of the Beacon Preferred Shares then
outstanding.
 
CHARACTER OF ASSETS AND BUSINESS
 
     Under the Maryland REIT Law, a Maryland real estate investment trust must
hold, either directly or through other entities, at least 75% of the value of
its assets in real estate assets, mortgages or mortgage related securities,
government securities, cash and cash equivalent items (including high-grade
short-term securities and receivables) and may not use or apply land for
farming, agriculture, horticulture or similar purposes. There are no such limits
for corporations, such as Beacon, which is organized under the MGCL.
 
                       FEDERAL INCOME TAX CONSIDERATIONS
 
GENERAL
 
     The following discussion summarizes certain material federal income tax
considerations relating to (i) the Partnership Merger, whereby Beacon
Partnership will merge with and into EOP Partnership (or into a limited
liability company wholly owned by EOP Partnership) and in which the Beacon
Unitholders will receive EOP Partnership Units in exchange for their Beacon
Partnership Units in accordance with the applicable Exchange Ratio (as defined
in the Merger Agreement), (ii) the subsequent ownership and disposition of such
EOP Partnership Units, and (iii) the ownership and disposition of EOP Shares
that could be issued to the holders of EOP Partnership Units upon the exercise
of their Unit Redemption Right. Opinions of counsel, however, are not binding on
the Internal Revenue Service (the "Service"), and there can be no assurance that
the IRS will agree with the following discussion and positions described
therein, or that the IRS will not seek to challenge such positions, which
challenge may be sustained by the courts.
 
     The information in this section is based on the Code, current, temporary
and proposed Treasury Regulations thereunder, the legislative history of the
Code, current administrative interpretations and practices of the IRS (including
its practices and policies as endorsed in private letter rulings, which are not
binding on the IRS except with respect to the taxpayer that receives such a
ruling), and court decisions, all as of the date hereof. No assurance can be
given that future legislation, Treasury Regulations, administrative
interpretations and court decisions will not significantly change current law or
adversely affect existing interpretations of current law. Any such change could
apply retroactively to transactions preceding the date of the change. Neither
EOP Partnership nor Beacon Partnership has requested or plans to request any
rulings from the IRS concerning the tax treatment of the Partnership Merger or
EOP Partnership subsequent to the Partnership Merger. Thus, no assurance can be
provided that the statements set forth herein (which do not bind the IRS or the
courts) will not be challenged by the IRS or will be sustained by a court if so
challenged.
 
     As used in this section, the term "EOP Partnership" refers solely to EOP
Operating Limited Partnership and the term "Beacon Partnership" refers solely to
Beacon Properties Limited Partnership.
 
     This discussion is intended to address only federal income tax
considerations that are generally applicable to all Beacon Unitholders who will
become limited partners of EOP Partnership ("Partners") in connection with the
Partnership Merger. The specific tax consequences of the Partnership Merger will
vary for each Beacon Unitholder due to the unique circumstances of each
(including, without limitation, the circumstances under which it originally
acquired its Beacon Partnership Units and subsequent events, both within Beacon
Partnership and outside Beacon Partnership, that may have affected such Beacon
Partnership Units).
 
                                       199
<PAGE>   208
 
Therefore, it is imperative that each Beacon Unitholder review the following
discussion and consult with his or her own tax advisor to determine the
interaction of his or her individual tax situation with the anticipated tax
consequences of the Partnership Merger and the subsequent ownership and
disposition of EOP Partnership Units.
 
     The following discussion is not exhaustive of all possible tax
considerations. For example, this summary does not give a detailed discussion of
state, local, or foreign tax considerations, nor does it discuss all of the
aspects of federal income taxation that may be relevant to a specific Beacon
Unitholder in light of particular circumstances. Except where indicated, the
discussion below describes general federal income tax considerations applicable
to individuals who are citizens or residents of the United States. Accordingly,
the following discussion has only limited application to domestic corporations
and persons subject to specialized federal income tax treatment, such as foreign
persons, trusts, estates, tax-exempt entities, regulated investment companies
and insurance companies.
 
     The following summary is not intended to be, and should not be construed
as, tax advice to a Beacon Unitholder. THE PARTICULAR TAX ATTRIBUTES OF AN
INDIVIDUAL BEACON UNITHOLDER COULD HAVE A MATERIAL IMPACT ON THE TAX
CONSEQUENCES OF THE PARTNERSHIP MERGER AND/OR THE SUBSEQUENT OWNERSHIP AND
DISPOSITION OF EOP PARTNERSHIP UNITS. THEREFORE, BEACON UNITHOLDERS ARE STRONGLY
URGED TO CONSULT WITH THEIR OWN TAX ADVISORS WITH REGARD TO THE FEDERAL INCOME
TAX CONSEQUENCES TO SUCH BEACON UNITHOLDERS OF THE PARTNERSHIP MERGER AND/OR THE
SUBSEQUENT OWNERSHIP AND DISPOSITION OF EOP PARTNERSHIP UNITS IN LIGHT OF THEIR
RESPECTIVE PERSONAL TAX SITUATIONS, AND WITH REGARD TO ANY TAX CONSEQUENCES
ARISING UNDER THE LAWS OF ANY STATE, LOCAL OR FOREIGN TAXING JURISDICTION. THE
FOLLOWING DISCUSSION IS NOT INTENDED AS A SUBSTITUTE FOR CAREFUL TAX PLANNING,
AND BEACON UNITHOLDERS SHOULD RELY ONLY ON THE ADVICE OF THEIR OWN TAX ADVISORS
WITH RESPECT TO THE TAX CONSEQUENCES OF THE PARTNERSHIP MERGER AND THE
SUBSEQUENT OWNERSHIP AND DISPOSITION OF EOP PARTNERSHIP UNITS OR EOP COMMON
SHARES.
 
SUMMARY
 
     Pursuant to, and subject to the terms and conditions of, the Merger
Agreement, Beacon Partnership has agreed to merge with and into EOP Partnership
(or into a subsidiary limited liability company wholly owned by EOP Partnership)
in connection with the Merger of Beacon with and into EOP. See "THE MERGERS."
Under the applicable federal income tax rules, the Partnership Merger will be
treated for federal income tax purposes as a contribution by Beacon Partnership
of all of its assets, subject to all of its existing liabilities, to EOP
Partnership in exchange for EOP Partnership Units, followed by a distribution of
such EOP Partnership Units to the Beacon Unitholders (including EOP, as the
successor by merger to Beacon) in liquidation of their respective partnership
interests in Beacon Partnership.
 
     The Partnership Merger and the resulting issuance and distribution of EOP
Partnership Units to Beacon Unitholders should not result in the recognition of
taxable gain at the time of the Partnership Merger to a Beacon Unitholder who
does not receive in connection with the Partnership Merger a cash distribution
(or a deemed cash distribution resulting from relief from liabilities) that
exceeds such Beacon Unitholder's aggregate adjusted basis in its Beacon
Partnership Units at the time of the Partnership Merger. Whether a particular
Beacon Unitholder will receive a deemed cash distribution attributable to relief
from liabilities in connection with the Partnership Merger that exceeds its
adjusted basis in its Beacon Partnership Units at the time of the Partnership
Merger will depend upon a number of variables, including such Beacon
Unitholder's adjusted tax basis in its Beacon Partnership Units at such time,
the assets that the Beacon Unitholder originally contributed to Beacon
Partnership in exchange for such Beacon Partnership Units, the indebtedness, if
any, of Beacon Partnership secured by such contributed assets at the time of the
Partnership Merger, the tax basis of such assets in the hands of Beacon
Partnership at the time of the Partnership Merger, such Beacon Unitholder's
share of the "unrealized gain" with respect to Beacon Partnership's assets at
the time of the
 
                                       200
<PAGE>   209
 
Partnership Merger, and the extent to which the Beacon Unitholder includes in
its basis for its Beacon Partnership Units a share of Beacon Partnership's
recourse liabilities by reason of indemnification or "deficit restoration"
obligations that will be eliminated by reason of the Partnership Merger.
 
     Even if a Beacon Unitholder does not recognize taxable gain at the time of
the Partnership Merger, there are a variety of events and transactions that
could occur subsequent to the Partnership Merger that could cause a Beacon
Unitholder to recognize all or part of the gain that previously had been
deferred either through the original contribution of assets to Beacon
Partnership for Beacon Partnership Units or through the Partnership Merger. See
"-- Effect of Subsequent Events." EOP, as the Managing General Partner of EOP
Partnership, is not required to take into account the tax consequences to the
limited partners of EOP Partnership (including former Beacon Unitholders) in
deciding whether to cause EOP Partnership to undertake specific transactions,
and the Partners generally would not have the right to approve or disapprove
such transactions (except for certain limited exceptions with respect to the One
Post Office Square and Center Plaza properties agreed to by EOP Partnership in
connection with the Partnership Merger). See "EOP PARTNERSHIP AGREEMENT AND
UNITS OF PARTNERSHIP INTEREST -- Management" and "-- Sales of Substantially All
of the Assets of EOP Partnership."
 
TAX STATUS OF EOP PARTNERSHIP
 
     An entity classified as a partnership for federal income tax purposes
generally is not a taxable entity and incurs no federal income tax liability.
Therefore, partners are required to take into account in computing their federal
income tax liability their allocable shares of income, gains, losses, deductions
and credits of the partnership, regardless of whether cash distributions are
made by the partnership to the partners. Distributions of money by a partnership
to partners generally are not taxable unless the amount of the distribution is
in excess of the partners' adjusted bases in their partnership interests.
 
     Under recently issued Treasury Regulations under Section 7701 of the Code,
a partnership (other than certain "publicly traded partnerships," as described
below) will be treated as a partnership for tax purposes unless it elects to be
treated as a corporation. EOP Partnership has not elected, and will not elect,
to be treated as a corporation.
 
     Section 7704 of the Code provides that a "publicly traded partnership" will
be treated as a corporation, unless at least 90 percent of its income consists
of "qualifying income" under that section. A "publicly traded partnership" is
any partnership, the interests in which are either (i) traded on an established
securities market or (ii) readily tradable on a "secondary market (or the
substantial equivalent thereof)." The applicable Treasury Regulations contain
certain "safe harbors" under which interests in a partnership will not be
considered readily tradable on a "secondary market (or the substantial
equivalent thereof)." There is a significant risk that the Unit Redemption Right
would be considered to cause the EOP Partnership Units to be considered readily
tradable on the "substantial equivalent of a secondary market." EOP Partnership
believes, however, that, even if interests in EOP Partnership otherwise would be
considered to be tradable on the "substantial equivalent of a secondary market,"
EOP Partnership likely will qualify for at least one of the "safe harbors"
provided in the Treasury Regulations regarding "secondary markets" and, thus,
should not be treated as a "publicly traded partnership." There can be no
assurance, however, that EOP Partnership will qualify for any of these "safe
harbors" at all times.
 
     In any event, EOP Partnership believes that it will have sufficient
"qualifying income" so as to qualify as a partnership (and not a corporation)
for tax purposes, even if it were considered a "publicly traded partnership." In
this regard, the income requirements generally applicable to REITs and the
definition of "qualifying income" under the "publicly traded partnership" rules
are sufficiently similar that it would be unlikely that EOP could meet the gross
income tests applicable to REITs unless EOP Partnership's "qualifying income"
were sufficient for it to avoid being classified as a corporation if it were
considered a "publicly traded partnership." See "-- Requirements for
Qualification as a REIT."
 
     If EOP Partnership were considered a "publicly traded partnership" (because
it did not qualify for a "safe harbor") and not treated as a corporation for
federal income tax purposes (because it meets the "qualifying income"
exception), the EOP Unitholders in EOP Partnership could be subject to certain
special
 
                                       201
<PAGE>   210
 
rules applicable to "publicly traded partnerships." In particular, if EOP
Partnership were a "publicly traded partnership," an EOP Unitholder would be
unable to use passive losses from other passive activities to offset its
allocable share of EOP Partnership gain and income. Conversely, any EOP
Unitholder's allocable share of EOP Partnership income and gains and not against
income and gains from other passive activities.
 
     The entire discussion of the federal tax consequences of the Partnership
Merger is based on EOP Partnership's belief that it is, and will be, classified
as a partnership for federal income tax purposes. If EOP Partnership were
instead taxable as a corporation, most, if not all, of the tax consequences
described below would be inapplicable. Hogan & Hartson, L.L.P., counsel to EOP,
will provide to EOP and to EOP Partnership an opinion to the effect that EOP
Partnership will be treated as a partnership for federal income tax purposes and
will not be subject to tax as a corporation or an association taxable as a
corporation. This opinion is conditioned upon certain representations made by
EOP Partnership as to factual matters relating to the organization and
operations of EOP Partnership. EOP Partnership intends to continue to operate in
a manner so as to qualify as a partnership following the Effective Time. Such
qualification and taxation as a partnership depend upon EOP Partnership's
ability to meet on an ongoing basis (through actual annual operating results)
the "qualifying income" test discussed above with respect to "publicly traded
partnerships," the result of which will not be reviewed by Hogan & Hartson
L.L.P. Accordingly, no assurance can be given that the actual results of EOP
Partnership's operations for any particular taxable year will satisfy such
requirements.
 
TAX CONSEQUENCES OF THE PARTNERSHIP MERGER
 
     As described above, the Partnership Merger will be treated for federal
income tax purposes as if all of the assets of Beacon Partnership were
contributed to EOP Partnership, subject to the existing liabilities of Beacon
Partnership, in exchange for EOP Partnership Units, followed by a liquidation of
Beacon Partnership and a distribution of the EOP Partnership Units to the Beacon
Unitholders. (The Partnership Merger may be effected through a merger of Beacon
Partnership into a limited liability company owned entirely by EOP Partnership.
This wholly owned limited liability company, however, would be disregarded for
federal income tax purposes, and Beacon Partnership would be treated as having
transferred its assets directly to EOP Partnership in exchange for EOP
Partnership Units.)
 
     Section 721 of the Code provides that no gain or loss is recognized in the
case of a contribution of property to the partnership in exchange for an
interest in the partnership. In addition, Section 731 of the Code provides that
a distribution of property, other than "money," by a partnership to a partner
does not result in taxable gain to that partner. The nonrecognition rule of
Section 721 ordinarily applies even when the transferred property is subject to
liabilities (so long as the assumption of such liabilities does not result in a
deemed distribution of "money" to the partner in excess of the partner's basis
in the assets contributed to the partnership). Accordingly, Section 721 and
Section 731 generally will apply to prevent the recognition of gain by either
Beacon Partnership or a Beacon Unitholder in connection with the Partnership
Merger. However, there are several potential exceptions to the availability of
nonrecognition treatment under Section 721 and Section 731 of the Code,
including the following:
 
          1. Any decrease in a partner's partnership liabilities, if not offset
     by a corresponding increase in the partner's share of other partnership
     liabilities, could cause the partner to recognize taxable gain as a result
     of the partner's being deemed to have received a cash distribution from the
     partnership. This recognition of gain could occur even if the decrease
     arose in connection with a contribution or distribution that would
     otherwise qualify for tax-free treatment under Section 721 or Section 731
     of the Code. A decrease in a partner's share of partnership liabilities
     (and the resulting deemed cash distribution) also might occur upon a
     repayment of part or all of such liabilities following the Partnership
     Merger.
 
          2. A contribution of property that is treated in whole or in part as a
     "disguised sale" of the contributed property under the Code.
 
          3. A distribution of "marketable securities" under Section 731(c) of
     the Code.
 
          4. Recapture under Section 465(e) of the Code.
 
                                       202
<PAGE>   211
 
The foregoing exceptions are discussed in greater detail below.
 
     In addition, although a Beacon Unitholder might not recognize gain at the
time of the Partnership Merger, a variety of events and transactions could occur
subsequent to the Partnership Merger that could cause a former Beacon Unitholder
to recognize part or all of the gain that has been deferred through the
Partnership Merger. See "-- Effect of Subsequent Events" below. (It is important
to note that, unlike a stockholder of corporate stock, a partner in a
partnership is considered to have a single aggregate basis in its entire
interest in the partnership, rather than a separate basis for portions of that
interest acquired at different times and/or for different amounts.)
 
     RELIEF FROM LIABILITIES/DEEMED CASH DISTRIBUTION.  If a Beacon Unitholder
is deemed to receive a cash distribution as a result of such Beacon Unitholder's
relief from its allocable share of Beacon Partnership liabilities in connection
with the Partnership Merger and any concurrent repayment of Beacon Partnership
debts, then such Beacon Unitholder will recognize taxable gain, but only to the
extent that the deemed cash distribution exceeds such Beacon Unitholder's
adjusted tax basis in its Beacon Partnership interest immediately prior to the
Partnership Merger. Whether the deemed cash distribution results in taxable gain
depends upon a number of circumstances that can be determined only with full
knowledge of the circumstances of all of EOP Partnership, Beacon Partnership and
the particular Beacon Unitholder.
 
     Under the applicable provisions of the Code, partners in a partnership
include their share of the partnership's liabilities, determined in accordance
with the Treasury Regulations under Section 752 of the Code, in determining the
basis of their partnership interests. Partners also include in the basis of
their partnership interests the adjusted tax basis of any capital contributions
that they have actually made to the partnership and their allocable share of all
partnership income and gains and reduce their basis by the amount of all
distributions that they receive from the partnership and their allocable share
of all partnership losses. For purposes of these rules, if a partner's share of
the partnership's liabilities is reduced for any reason, the partner is deemed
to have received a cash distribution equal to the amount of such reduction.
 
     In the case of the Partnership Merger, these rules will be applied by
reference to the Beacon Unitholder's share of the liabilities of Beacon
Partnership immediately before the Partnership Merger and that Beacon
Unitholder's share of liabilities as a Partner in EOP Partnership immediately
after the Partnership Merger. Any deemed cash distribution resulting from a
reduction in such Partner's share of liabilities will be considered to be a
deemed cash distribution from EOP Partnership (rather than from Beacon
Partnership). A Beacon Unitholder may offset his share of the liabilities of EOP
Partnership against the elimination of such Beacon Unitholder's share of
liabilities of Beacon Partnership in determining the amount of the deemed cash
distribution to such Beacon Unitholder from EOP Partnership; however, if a
Beacon Unitholder is deemed under these rules to receive a cash distribution
from EOP Partnership in an amount in excess of the basis, immediately prior to
the Partnership Merger, of the Beacon Partnership Units owned by that Beacon
Unitholder, the Beacon Unitholder may recognize taxable gain.
 
     Under Section 752 of the Code and the Treasury Regulations thereunder, a
partner's share of partnership liabilities includes the partner's share of
partnership recourse liabilities plus the partner's share of partnership
nonrecourse liabilities. A partnership liability is a recourse liability to the
extent that any partner (or a person related to any partner) bears the "economic
risk of loss" for that liability within the meaning of the Treasury Regulations
and a partnership liability is nonrecourse to the extent that no partner (or
related person) bears the "economic risk of loss." With certain limited
exceptions (see "THE MERGERS -- Interests of Certain Persons in the Mergers"),
no Beacon Unitholder will have any share of any recourse liabilities of EOP
Partnership. Therefore, Beacon Unitholders who currently include in the basis
for their Beacon Partnership Units a share of Beacon Partnership's recourse
liabilities by reason of indemnification or "deficit restoration" agreements
that they have entered into with Beacon Partnership, will realize a deemed cash
distribution in connection with the Partnership Merger because such
indemnification and "deficit restoration" agreements will be eliminated in the
Partnership Merger.
 
     A partner's share of partnership nonrecourse liabilities equals the sum of
(i) the partner's share of "partnership minimum gain," determined in accordance
with the rules of Section 704(b) of the Code and the Treasury Regulations
thereunder; (ii) the amount of any taxable gain that would be allocated to the
partner
 
                                       203
<PAGE>   212
 
under Section 704(c) of the Code (or in the same manner as Section 704(c) of the
Code in connection with a revaluation of partnership property) if the
partnership disposed of (in a taxable transaction) all partnership property
subject to one or more nonrecourse liabilities of the partnership in full
satisfaction of the liabilities and for no other consideration ("Section 704(c)
Minimum Gain"); and (iii) the partner's share of "excess nonrecourse
liabilities" (i.e., those not allocated under (i) and (ii) above), which are to
be allocated in accordance with the partners' respective "shares of partnership
profits."
 
     Immediately after the Partnership Merger, EOP Partnership will not have any
"partnership minimum gain" for purposes of Section 704(b) of the Code, and thus
no EOP Unitholder (including any former Beacon Unitholders) will have any share
of EOP Partnership nonrecourse debt as a result thereof. The nonrecourse
liabilities, if any, allocable for a particular former Beacon Unitholder by
reason of Section 704(c) Minimum Gain will depend upon a number factors,
including, for example, (i) the former Beacon Unitholder's share of existing
Section 704(c) Minimum Gain of Beacon Partnership immediately prior to the
Partnership Merger (although the matter is not free from doubt, the amount of
such share appears to depend upon, among other things, the assets that such
Beacon Unitholder contributed (or was deemed to contribute) to Beacon
Partnership in exchange of Beacon Partnership Units, the tax basis of those
assets at the time of contribution relative to their fair market value at such
time, and the amount of nonrecourse liabilities of Beacon Partnership currently
secured by such assets, relative to the current tax basis and "tax book value"
of those assets), (ii) the extent, if any, to which the Section 704(c) Minimum
Gain attributable to the assets of Beacon Partnership increases by reason of the
Partnership Merger (because the nonrecourse liabilities currently secured by
particular assets exceed the tax basis of such assets by more than the existing
Section 704(c) Minimum Gain attributable to such assets), and (iii) the extent
to which EOP Partnership causes nonrecourse liabilities as to which there exists
Section 704(c) Minimum Gain immediately prior to the Partnership Merger to be
repaid or refinanced in connection with the Partnership Merger in a manner that
reduces or eliminates that Section 704(c) Minimum Gain.
 
     EOP Partnership will allocate any "excess nonrecourse liabilities" by
taking into account various facts and circumstances relating to its partners'
respective interests in the profits of EOP Partnership. This method could result
in changes, from year to year, of a Partner's share of the "excess nonrecourse
liabilities" of EOP Partnership. The method that EOP Partnership will use to
allocate "excess nonrecourse liabilities" is expected to result in an allocation
of a greater share of the "excess nonrecourse liabilities of EOP Partnership to
the former Beacon Unitholders than would result, for example, if EOP Partnership
were to allocate the "excess nonrecourse liabilities" in accordance with their
percentage ownership interest in EOP Partnership. There can be no assurance,
however, that the IRS will respect the method to be used by EOP Partnership to
allocate "excess nonrecourse liabilities" following the Partnership Merger.
 
     In summary, even if the method to be used by EOP Partnership to allocate
"excess nonrecourse liabilities" is respected, there can be no assurance that
each Beacon Unitholder will be allocated an overall share of the nonrecourse
liabilities of EOP Partnership such that no Beacon Unitholder will be deemed for
federal income tax purposes to have received as a result of the Partnership
Merger a taxable distribution of money in excess of such Beacon Unitholder's
adjusted basis in his Beacon Partnership interest. HENCE, IT IS ESSENTIAL IN
ASSESSING THE POTENTIAL IMPACT RESULTING FROM A DEEMED RELIEF FROM LIABILITIES
THAT EACH BEACON UNITHOLDER CONSULT WITH HIS OWN TAX ADVISOR AS TO HIS
PARTICULAR CIRCUMSTANCES.
 
     DISGUISED SALE REGULATIONS.  The Partnership Merger would be taxable to a
Beacon Unitholder to the extent that it is treated as a "disguised sale" of all
or a portion of either the assets of Beacon Partnership or such Beacon
Unitholder's Partnership Units under the Code or Treasury Regulations. Section
707 of the Code and the Treasury Regulations thereunder (the "Disguised Sale
Regulations") generally provide that, unless one of certain prescribed
exceptions is applicable, a partner's contribution of property to a partnership
and a contemporaneous transfer of money or other consideration from the
partnership (other than an interest in the partnership, such EOP Partnership
Units) to the partner will be treated as a sale, in whole or in part, of such
property by the partner to the partnership. The Disguised Sale Regulations
further provide that transfers of money or other consideration between a
partnership and a partner that are made within two years of each
 
                                       204
<PAGE>   213
 
other are presumed to be a sale unless the facts and circumstances clearly
establish that either the transfers do not constitute a sale or an exception to
disguised sale treatment applies.
 
     1.  Effect of Assumption of Liabilities Under the Disguised Sale
Regulations.  For purposes of these rules, certain reductions in a partner's
share of liabilities are treated as a transfer of money or other property from
the partnership to the partner which may give rise to a disguised sale, even if
that reduction would not otherwise result in a taxable deemed cash distribution
in excess of the partner's basis. Furthermore, the method of computing the
existence and amount of any reduction in a partner's share of liabilities under
the Disguised Sale Regulations is different from, and generally more onerous
than, the method applied under the rules discussed above under the heading
"-- Relief From Liabilities/Deemed Cash Distribution." However, if a transfer of
property by a partner to a partnership is not otherwise treated to any extent as
part of a disguised sale, any reduction in the partner's share of "qualified
liabilities" (discussed below) is not treated as part of a disguised sale.
Moreover, even if the transfer otherwise constitutes a disguised sale to some
extent, the amount of the reduction in the partner's share of liabilities
treated as part of the sale proceeds may in some cases be computed under a more
favorable method in the case of "qualified liabilities" than in the case of
other liabilities.
 
     For purposes of the Disguised Sale Regulations, a "qualified liability" in
connection with a transfer of property to a partnership includes (i) any
liability incurred more than two years prior to the earlier of the transfer of
the property or the date the partner agrees in writing to the transfer, as long
as the liability has encumbered the transferred property throughout the two-year
period; (ii) a liability that was not incurred in anticipation of the transfer
of the property to a partnership, but that was incurred by the partner within
the two-year period prior to the earlier of the date the partner agrees in
writing to transfer the property or the date the partner transfers the property
to a partnership and that has encumbered the transferred property since it was
incurred; (iii) a liability that is traceable under the Treasury Regulations to
capital expenditures with respect to property contributed to the partnership;
and (iv) a liability that was incurred in the ordinary course of the trade or
business in which property transferred to the partnership was used or held, but
only if all the assets related to that trade or business are transferred, other
than assets that are not material to a continuation of the trade or business.
However, a recourse liability is not a qualified liability unless the amount of
the liability does not exceed the fair market value of the transferred property
(less any other liabilities that are senior in priority and encumber such
property or any allocable liabilities described in (iii) or (iv), above) at the
time of transfer. A liability incurred within two years of the transfer is
presumed to be incurred in anticipation of the transfer unless the facts and
circumstances clearly establish that the liability was not incurred in
anticipation of the transfer. However, to the extent that the proceeds of a
partner or partnership liability (the refinancing debt) are allocable under the
Treasury Regulations to payments discharging all or part of any other liability
of that partner or of the partnership, as the case may be, the refinancing debt
is considered the same as the other liability for purposes of the Disguised Sale
Regulations. Finally, if a partner treats a liability described in (ii) above as
a "qualified liability" because the facts clearly establish that it was not
incurred in anticipation of the transfer, such treatment must be disclosed to
the IRS in the manner set forth in the Disguised Sale Regulations.
 
     Beacon and Beacon Partnership have represented that any liabilities of
Beacon Partnership assumed by EOP Partnership in the Partnership Merger fall
into one of the four categories of "qualified liabilities" described above.
However, certain liabilities of Beacon Partnership may be qualified liabilities
solely by reason of exception (ii) in the preceding paragraph, and thus Beacon
Partnership and former Beacon Unitholders may be required to make disclosure
with respect to those liabilities in their tax returns for the year in which the
Partnership Merger occurs.
 
     2.  Effect of Cash Distributions Under the Disguised Sale
Regulations.  Cash distributions from a partnership to a partner may be treated
as a transfer of property for purposes of the "disguised sale" rules. An
exception applies, however, to distributions of "operating cash flow," as such
term is defined in the Disguised Sale Regulations. Operating cash flow
distributions are presumed not to be a part of a sale of property to a
partnership unless the facts and circumstances clearly establish that the
distribution of operating cash flow is part of a sale. No distribution of cash
will be made by EOP Partnership to Beacon Unitholders at the time of the
Partnership Merger. EOP Partnership believe that its periodic distributions of
cash to holders of EOP
 
                                       205
<PAGE>   214
 
Partnership Units, including former Beacon Unitholders, will qualify as
distributions of "operating cash flow" under the Disguised Sale Regulations, and
that there will be no facts or circumstances indicating that such distributions
should be considered part of a sale.
 
     3.  Effect of the Unit Redemption Right.  The existence of the Unit
Redemption Right with respect to the EOP Partnership Units, which merely permits
a holder thereof to require that EOP Partnership redeem his or her EOP
Partnership Units for the fair value thereof should not be considered to be
"other property" received by Beacon Partnership (and thus the Beacon
Unitholders) in connection with the Partnership Merger that would cause some
portion of the Partnership Merger to be considered a disguised sale. However, if
a former Beacon Unitholder were to exercise the Unit Redemption Right at the
time of or shortly after the Partnership Merger, there is a risk that the
payment, by or on behalf of EOP Partnership, of consideration pursuant to the
Unit Redemption Right for EOP Partnership Units held by a former Beacon
Unitholder could result in "disguised sale" treatment as to the Partnership
Merger. As discussed in the next paragraph below, there is no clear authority as
to whether the adverse consequences of that treatment would be limited only to
the former Beacon Unitholder(s) that exercise the Unit Redemption Right, or
whether those consequences would be borne proportionately by all former Beacon
Unitholders (including EOP as the successor by merger to Beacon). In the absence
of clear authority to the contrary, however, EOP Partnership intends to take the
position that an exercise of the Unit Redemption Right does not in the first
instance result in disguised sale treatment for the Partnership Merger and, in
any event, that the adverse consequences of such treatment accrue only to the
former Beacon Unitholders that exercise the Unit Redemption Right, rather than
to all former Beacon Unitholders. There can be no assurance, however, that the
IRS would not seek to challenge either or both of these positions.
 
     4.  Effect of Disguised Sale Characterization.  In any case in which a
transfer of Beacon Partnership assets to EOP Partnership were found to be a
"disguised sale," all or a substantial portion of the gain represented by the
excess of the fair market value of these Beacon Partnership assets over the tax
basis of these assets would be recognized by Beacon Partnership (and indirectly
by the Beacon Unitholders). If a transfer of property to a partnership and one
or more transfers of money or other consideration (including the assumption or
taking subject to a liability) by the partnership to that partner are treated as
a disguised sale, then the transfers will be treated as a sale of property, in
whole or in part, to the partnership by the partner acting in a capacity other
than as a member of a partnership, rather than as a contribution under Section
721 of the Code and a partnership distribution. A transfer that is treated as a
sale is treated as a sale for all purposes of the Code and the sale is
considered to take place on the date that, under general principles of federal
tax law, the partnership is considered to become the owner of the property. If
the transfer of money or other consideration from the partnership to the partner
occurs after the transfer of property to the partnership, the partner and the
partnership are treated as if, on the date of the transfer of the property, the
partnership transferred to the partner an obligation to transfer to the partner
money or other consideration.
 
     Moreover, if a transfer of property to a partnership is treated as part of
a sale without regard to the partnership's assumption of or taking subject to a
"qualified liability," as defined above, then the partnership's assumption of or
taking subject to that liability is treated as a transfer of additional
consideration to the transferring partner. The amount of such "qualified
liability" treated as additional consideration is generally the lesser of (x)
the amount of the "qualified liability" and (y) an amount determined by
multiplying the "qualified liability" by the partner's "net equity percentage."
The "net equity percentage" is generally the amount of consideration received by
such partner (other than relief from "qualified liabilities") divided by the
partner's net equity in the property sold, as calculated under the Disguised
Sale Regulations.
 
     There is no authority with respect to the application of the Disguised Sale
Regulations to circumstances in which a partnership, such as Beacon Partnership
in the Partnership Merger, is deemed to transfer property to another
partnership, such as EOP Partnership, in exchange for partnership interests and
the transferor partnership liquidates or is deemed to liquidate. Under such
circumstances, it is possible that the IRS would treat any transfer of money or
other consideration from EOP Partnership giving rise to disguised sale treatment
as being made to Beacon Partnership and then distributed by Beacon Partnership
to the Beacon Unitholder, as opposed to being made directly to the Beacon
Unitholder. If this treatment were to apply with respect to the exercise by
former Beacon Unitholders of the Unit Redemption Right with respect to EOP
 
                                       206
<PAGE>   215
 
Partnership Units within two years following the Partnership Merger, the
allocation to the Beacon Unitholders of taxable gain of Beacon Partnership might
be determined under the allocation provisions of the Beacon Partnership
Agreement, with the result that all Beacon Unitholders could be allocated a
share of such gain, even though the money or other consideration giving rise to
disguised sale treatment was received only by the Beacon Unitholders choosing to
exercise the Unit Redemption Right.
 
     SECTION 465(E) RECAPTURE.  In general, the "at-risk" rules of Section 465
of the Code limit the use of losses, see "-- Tax Treatment of Partners Who Hold
EOP Partnership Units After the Partnership Merger -- Limitations on
Deductibility of Losses; Treatment of Passive Activities and Portfolio Income,"
below. Under Section 465(e) of the Code, a taxpayer may be required to include
in gross income (i.e., to "recapture") losses previously allowed to the taxpayer
with respect to an "activity," if the amount for which the taxpayer is "at risk"
in the activity is less than zero at the close of the taxable year.
 
     The identification of a taxpayer's activities for purposes of the at-risk
rules and the determination of a taxpayer's amount at risk in an activity are
complex and uncertain. However, as a general matter a taxpayer's amount at risk
in an activity is increased by the taxpayer's income, and reduced by the
taxpayer's losses, from the activity. Therefore, any income taken into account
by a Beacon Unitholder as a result of a deemed cash distribution or disguised
sale treatment is likely to reduce the extent to which Section 465(e) of the
Code would apply to that Beacon Unitholder.
 
     Nevertheless, it is possible that the consummation of the Partnership
Merger or the repayment of certain "qualified nonrecourse financing" (as defined
in Section 465(b)(6) of the Code) of Beacon Partnership at the time of or
following the Partnership Merger, singularly or in combination, could cause a
former Beacon Unitholder's amount at risk in an activity to be reduced below
zero and could, therefore, cause an income inclusion to the former Beacon
Unitholder under Section 465(e) of the Code. In this regard, the definition of
"qualified nonrecourse financing" is different from, and in certain material
respects more restrictive than, the definition of "nonrecourse liabilities" that
are taken into account under Section 752 of the Code (for example, debt issued
by EOP Partnership in the public debt markets may not qualify as "qualified
nonrecourse financing"; EOP Partnership's long-term strategy is to maximize the
amount of its debt that is issued to the public and/or institutional lenders).
Hence, it is possible that a partner can incur a reduction in its share of
"qualified nonrecourse financing" that causes it to recognize income under
Section 465(e) of the Code even though the partner has a sufficient share of
"nonrecourse liabilities" under Section 752 of the Code so that it would not be
deemed to have received a deemed cash distribution in excess of its basis in its
partnership interest (and thus recognized gain as a result thereof).
 
     WITHHOLDING.  If any gain is recognized in connection with the Partnership
Merger by a Beacon Unitholder who is not considered a U.S. resident for tax
purposes, withholding (in an amount equal to 10% of the "amount realized" by
such Beacon Unitholder, which would include both the value of the EOP
Partnership Units received and such Beacon Unitholders share of the liabilities
of Beacon Partnership, as determined for federal income tax purposes) under the
Foreign Investment in Real Property Tax Act of 1980 may be required.
Alternatively, if gain were recognized by the Beacon Partnership the non-U.S.
Unitholder could be subject to withholding at the rate of 35% on his share of
the gain. As a condition to the receipt of EOP Partnership Units in the
Partnership Merger, each Beacon Unitholder who does not want to be subject to
such withholding will have to provide to EOP Partnership either a certification,
made under penalties of perjury, that it is a United States citizen or resident
(or if an entity, an entity organized under the laws of the United States) or,
alternatively, a notice of nonrecognition treatment with respect to the
Partnership Merger in a form reasonably acceptable to EOP Partnership.
 
EFFECT OF SUBSEQUENT EVENTS
 
     In addition to any gain that might be recognized by a Beacon Unitholder at
the time of the Partnership Merger, a variety of future events and transactions
could cause some or all of the former Beacon Unitholders holding EOP Partnership
Units as a result of the Partnership Merger to recognize part or all of the
taxable gain that has been deferred either through the original contribution of
assets to Beacon Partnership for Beacon Partnership Units or through the
Partnership Merger. Such future events or transactions might include, but
 
                                       207
<PAGE>   216
 
are not limited to, (i) the sale or other taxable disposition by EOP Partnership
of one or more of the individual properties owned by Beacon Partnership
immediately prior to the Partnership Merger; (ii) the reduction in the amount of
existing nonrecourse liabilities secured by individual properties owned by
Beacon Partnership immediately prior to the Partnership Merger as a result of a
refinancing or repayment thereof by EOP Partnership (including with the proceeds
of public or private debt financing obtained by EOP Partnership that is not
secured by individual assets owned by EOP Partnership or that is secured by
assets owned by EOP Partnership other than those that were owned by Beacon
Partnership at the time of the Partnership Merger); (iii) the issuance of
additional EOP Partnership Units, including in connection with the subsequent
issuances of additional Common Shares or Preferred Shares by EOP or in
connection with property acquisitions by EOP Partnership; (iv) an increase to
the tax basis of the individual properties owned by Beacon Partnership
immediately prior to the Partnership Merger resulting from capital expenditures;
and (v) the elimination over time of the disparity between the current tax basis
of the individual properties owned by Beacon Partnership immediately prior to
the Partnership Merger and the "book bases" of such properties based upon their
fair market values at the time of the Partnership Merger (see "-- Tax Treatment
of Partners Who Hold EOP Partnership Units After the Partnership Merger -- Tax
Allocations with Respect to Book-Tax Difference on Contributed Properties,"
below), which will have the effect of reducing the amount of EOP Partnership
indebtedness allocable to the former Beacon Unitholders for basis purposes and
therefore could result in deemed cash distributions.
 
     EOP, as the Managing General Partner of EOP Partnership, is not required to
take into account the tax consequences to the EOP Unitholders (including the
former Beacon Unitholders who will be EOP Unitholders following the Partnership
Merger) in deciding whether to cause EOP Partnership to undertake specific
transactions that could cause the EOP Unitholders to have to recognize gain, and
the EOP Unitholders generally would not have the right to approve or disapprove
such transactions. See "Description of EOP Partnership Units."
 
     SALE OF INDIVIDUAL PROPERTIES.  In the event EOP Partnership were to sell
any of the assets acquired from Beacon Partnership in the Partnership Merger
that have "unrealized gain" (as defined in the applicable Treasury Regulations)
at the time of the Partnership Merger (i.e., that have a value at the time of
the Partnership Merger in excess of their adjusted tax basis at such time)
("Unrealized Gain"), former Beacon Unitholders would be specially allocated by
EOP Partnership an amount of taxable gain equal to the such Unrealized Gain
(reduced by any amounts amortized as described below). (It is important to note
that Unrealized Gain will exist with respect to any asset held by Beacon
Partnership immediately prior to the Effective Time of the Partnership Merger
having a value in excess of its adjusted tax basis at such time, computed taking
into account depreciation deductions claimed with respect to such asset by
Beacon Partnership. Such Unrealized Gain generally will be allocated among all
former Beacon Unitholders (including EOP as successor to Beacon's Beacon
Partnership Units) in proportion to the EOP Partnership Units that they receive
in the Partnership Merger, however, although the matter is not free from doubt,
EOP Partnership will take the position that the portion of any Unrealized Gain
that is attributable to assets contributed to Beacon Partnership in transactions
in which the recognition of gain was deferred and Beacon Partnership succeeded
to the contributing partner's tax basis will be specially allocated to the
former Beacon Unitholders who contributed such properties.) The former Beacon
Unitholders would report such additional gain on their individual federal income
tax returns. Such former Beacon Unitholders would not be entitled to any special
distributions from EOP Partnership in connection with such a sale, and thus they
would not necessarily receive cash distributions from EOP Partnership sufficient
to pay the additional taxes attributable to such gain. If a former Beacon
Unitholder is required to recognize Unrealized Gain, a former Beacon Unitholder
with passive losses or passive loss carryforwards may be able to use such losses
to offset the Unrealized Gain (unless EOP Partnership is considered a "publicly
traded partnership," in which case only losses attributable to EOP Partnership
could be used for such purpose, see "Tax Status of EOP Partnership").
 
     For a discussion of the treatment of the Unrealized Gain in the absence of
a sale of the assets acquired by EOP Partnership from Beacon Partnership in the
Partnership Merger and the impact of that treatment for the former Beacon
Unitholders, see "Tax Treatment of Partners Who Hold EOP Partnership Units After
the
 
                                       208
<PAGE>   217
 
Partnership Merger -- Tax Allocations with Respect to Book-Tax Difference on
Contributed Properties" below.
 
     REFINANCING OF THE INDEBTEDNESS SECURED BY INDIVIDUAL PROPERTIES.  As
described above under "Relief from Liabilities/Deemed Distributions," a former
Beacon Unitholder could recognize taxable gain as a result of relief from
liabilities resulting in a taxable deemed distribution in connection with the
Partnership Merger. Furthermore, there can be no assurance that any future
refinancing or repayment of the indebtedness securing the properties owned by
Beacon Partnership at the time of the Partnership Merger would not result in a
reduction of the liabilities allocated to the former Beacon Unitholders, thus
resulting in a taxable deemed distribution at that time. In this regard, it is
important to note that EOP Partnership's current long-term financing strategy is
to have as little debt as possible that is secured by individual properties and
to have as much of its debt as is possible in the form of unsecured debt, held
either by the public or by institutional investors, which debt may or may not be
recourse to EOP, as managing partner of EOP Partnership. Depending upon its
terms, such debt may not qualify either as "nonrecourse liabilities" for
purposes of the rules under Section 752 of the Code (see "-- Tax Consequences of
the Partnership Merger -- Relief from Liabilities/Deemed Cash Distribution") or
as "qualified nonrecourse financing" for purposes of the "at risk rules" (see
"Tax Consequences of the Partnership Merger -- Section 465(e) Recapture").
Moreover, even if such debt qualifies as a nonrecourse liability, the amount of
Section 704(c) Minimum Gain with respect to properties that previously secured
traditional mortgage indebtedness would likely be reduced significantly (thereby
resulting in a reduction of the nonrecourse liabilities allocable to the former
Beacon Unitholders to which such Section 704(c) Minimum Gain was allocable (and
a resulting deemed cash distribution to such former Beacon Unitholders)). As a
general rule, however, the maximum amount of gain that a former Beacon
Unitholder could recognize as a result of a reduction in nonrecourse liabilities
is the amount by which its "share" of the liabilities of Beacon Partnership
(determined as set forth in "Tax Consequences of the Partnership
Merger -- Relief from Liabilities/Deemed Cash Distribution") immediately prior
to the Partnership Merger exceeds its adjusted basis in the Beacon Units
immediately prior to the Partnership Merger.
 
TAX TREATMENT OF PARTNERS WHO HOLD EOP PARTNERSHIP UNITS AFTER THE PARTNERSHIP
MERGER
 
     INCOME AND DEDUCTIONS IN GENERAL.  Each Partner will be required to report
on its income tax return its allocable share of income, gains, losses,
deductions and credits of EOP Partnership. Such items must be included on the
EOP Unitholder's federal income tax return without regard to whether EOP
Partnership makes a distribution of cash to such EOP Unitholder. No federal
income tax will be payable by EOP Partnership.
 
     TREATMENT OF EOP PARTNERSHIP DISTRIBUTIONS.  Distributions of money by EOP
Partnership to an EOP Unitholder (including for these purposes decreases in a
EOP Unitholder's share of EOP Partnership liabilities) generally will not be
taxable to such EOP Unitholder for federal income tax purposes to the extent of
such EOP Unitholder's aggregate basis in his EOP Partnership Units immediately
before the distribution. Distributions of money in excess of such basis
generally will be considered to be gain in the amount of such excess, a portion
of which may be taxed as ordinary income. As discussed above, any reduction in
an EOP Unitholder's share of EOP Partnership's nonrecourse liabilities, whether
through repayment, refinancing with recourse liabilities, refinancing with
nonrecourse liabilities secured by the other assets, or otherwise, will be
treated as a distribution of money to such EOP Unitholder. An issuance of
additional EOP Partnership Units by EOP Partnership without a corresponding
increase in debt may decrease the existing EOP Unitholders' share of nonrecourse
liabilities of EOP Partnership and, thus, will result in a corresponding deemed
distribution of money.
 
     INITIAL BASIS OF EOP PARTNERSHIP UNITS.  In general, a Beacon Unitholder
who acquires EOP Partnership Units in the Partnership Merger will have an
initial tax basis in such EOP Partnership Units ("Initial Basis") equal to the
aggregate basis in its Beacon Partnership Units, adjusted to reflect the effects
of the Partnership Merger (that is, reduced to reflect any deemed distributions
resulting from a reduction in the former Beacon Unitholder's share of
liabilities and increased to reflect any gain required to be recognized in
connection with the Partnership Merger).
 
                                       209
<PAGE>   218
 
     As a result of the decreases in each EOP Unitholder's share of EOP
Partnership nonrecourse liabilities that may result from the consummation of the
Partnership Merger (see " -- Tax Consequences of the Partnership Merger --
Relief from Liabilities/Deemed Cash Distributions"), each Beacon Unitholder who
receives EOP Partnership Units may have an Initial Basis in his EOP Partnership
Units that is significantly lower than the basis in his Beacon Partnership Units
immediately before the Partnership Merger. Because of this reduction in basis, a
Beacon Unitholder can expect to receive taxable distributions of cash and deemed
distributions resulting from a reduction of an EOP Unitholder's share of EOP
Partnership nonrecourse liabilities sooner than it would have if such basis
reduction had not occurred. Such basis reduction also would affect the EOP
Unitholder's ability to deduct its share of any EOP Partnership tax losses. For
the effects on a Beacon Unitholder of a reduction in basis that may result from
the Partnership Merger, see "-- Tax Consequences of the Partnership
Merger -- Relief from Liabilities/Deemed Cash Distribution" and "--Treatment of
EOP Partnership Distributions," above and "-- Limitations on Deductibility of
Losses; Treatment of Passive Activities and Portfolio Income," below.
 
     Each former Beacon Unitholder's Initial Basis in its EOP Partnership Units
will generally be increased by (a) its share of EOP Partnership taxable income
and (b) its respective share of increases in nonrecourse liabilities incurred by
EOP Partnership, if any. Generally, each former Beacon Unitholder's Initial
Basis in its EOP Partnership Units will be decreased (but not below zero) by (i)
its respective share of EOP Partnership distributions, (ii) its respective share
of decreases in liabilities of EOP Partnership, including any decrease in its
respective shares of nonrecourse liabilities of EOP Partnership (see "-- Tax
Consequences of the Partnership Merger -- Relief from Liabilities/Deemed Cash
Distribution"), (iii) its respective share of any losses of EOP Partnership, and
(iv) their respective share of nondeductible expenditures of EOP Partnership
that are not chargeable to capital account.
 
     ALLOCATIONS OF EOP PARTNERSHIP INCOME, GAIN, LOSS AND DEDUCTIONS.  The EOP
Partnership Agreement provides that, if EOP Partnership operates at a net loss,
net losses shall be allocated to the holders of EOP Partnership Units in
proportion to their respective percentage ownership interests in EOP
Partnership, provided that net losses that would have the effect of creating a
deficit balance in a limited partner's capital account (as specially adjusted
for such purpose) ("Excess Loss") will be reallocated to the general partner(s).
The EOP Partnership Agreement also provides that, if EOP Partnership operates at
a net profit, net income will be allocated first to the general partner(s) to
the extent of Excess Losses with respect to which the general partner(s) have
not previously been allocated net income and any remaining net income shall be
allocated to the holders of EOP Partnership Units in proportion to their
respective percentage ownership interests in EOP Partnership. (Special
provisions may apply with respect to holders of preferred units in EOP
Partnership, depending upon the terms of the particular class or series of
preferred units. As a general rule, any class of preferred units that has a
preferential right to cash distributions will be allocated gross income equal to
the preferential distribution (which will have the effect of reducing income
otherwise allocable to the holders of EOP Partnership Units), while holders of
preferred units that have a preferred right to a return of capital will not be
allocated any losses.)
 
     EFFECT OF THE PARTNERSHIP MERGER ON DEPRECIATION.  The Partnership Merger
generally will have no impact on the computation of depreciation deductions with
respect to the assets held by EOP Partnership immediately prior to the Effective
Time, but it will affect adversely the computation of depreciation deductions
with respect to assets acquired by EOP Partnership in the Partnership Merger
from Beacon Partnership, as compared to the computation of depreciation
deductions by Beacon Partnership with respect to such assets. Under Section
708(b)(1)(B) of the Code, a partnership will be considered to have been
terminated if within a twelve-month period there is a sale or exchange of 50% or
more of the interests in partnership capital and profits. As a result of the
merger of Beacon into EOP (and the resulting deemed transfer of Beacon's
interest in Beacon Partnership immediately prior to the Partnership Merger),
Beacon Partnership will "terminate" under Section 708(b)(1)(B) of the Code.
Section 168(i)(7) of the Code provides, in effect, that when a partnership
terminates under Section 708(b)(1)(B) of the Code the partnership must begin new
depreciation periods for its property. As a result, the remaining basis of the
assets transferred by Beacon Partnership to EOP Partnership in the Partnership
Merger will be depreciated over the
 
                                       210
<PAGE>   219
 
period that would apply if those assets were newly acquired by EOP Partnership
in a purchase transaction (i.e., 39 years in the case of buildings and
structural components).
 
     TAX ALLOCATIONS WITH RESPECT TO BOOK-TAX DIFFERENCE ON CONTRIBUTED
PROPERTIES.  Pursuant to Section 704(c) of the Code, income, gain, loss and
deduction attributable to appreciated or depreciated property that is
contributed to a partnership must be allocated for federal income tax purposes
in a manner such that the contributor is charged with, or benefits from, the
unrealized gain or unrealized loss associated with the property at the time of
contribution. The amount of such unrealized gain or unrealized loss is generally
equal to the difference between the fair market value of the contributed
property at the time of contribution and the adjusted tax basis of such property
at the time of contribution (referred to as "Book-Tax Difference"). These rules
will apply with respect to the assets of Beacon Partnership deemed contributed
to EOP Partnership in the Partnership Merger. The same rules effectively apply
with respect to EOP Partnership (i.e., the existing EOP Partnership assets will
have to be restated for capital account purposes to their then current fair
market value at the time of the Partnership Merger, and the difference between
that amount and the existing tax basis will represent a Book-Tax Difference). It
is anticipated that at the time of the Partnership Merger, there will exist a
substantial amount of Book-Tax Difference both with respect to the assets deemed
to have been contributed by Beacon Partnership to EOP Partnership and with
respect to the assets currently held by EOP Partnership. Because of prior
depreciation deductions, this will be the case even if a particular asset has
not appreciated in value in economic terms.
 
     The EOP Partnership Agreement requires allocations of income, gain, loss
and deduction attributable to the properties as to which there is a Book-Tax
Difference be made in a manner that is consistent with Section 704(c) of the
Code. Treasury Regulations under Section 704(c) require partnerships to use a
"reasonable method" for allocation of items affected by Section 704(c) of the
Code. EOP Partnership uses the "traditional method," which is one of the three
methods outlined by the Treasury Regulations under Section 704(c). Under the
traditional method, in the case of an asset with respect to which there is a
Book-Tax Difference, a holder of EOP Partnership Units who is deemed to have
contributed that asset (i.e., a former Beacon Unitholder with respect to assets
transferred by Beacon Partnership in the Partnership Merger and the existing EOP
Unitholders with respect to assets currently owned by EOP Partnership) will be
allocated less depreciation (or perhaps no depreciation) with respect to such
asset (and thus more income) than would be the case if the Partnership Merger
had not occurred and the asset had continued to be owned by Beacon Partnership
or EOP Partnership, as applicable. In the case of former Beacon Unitholders,
these incremental allocations of income with respect to assets previously held
by Beacon Partnership will be offset, at least in part, by larger depreciation
deductions allocable to such former Beacon Unitholder with respect to other
assets held by EOP Partnership prior to the Partnership Merger as to which there
exists a Book-Tax Difference. It is not possible to predict whether, and the
extent to which, these various allocations attributable to Book-Tax Differences
may result in former Beacon Unitholders recognizing more income with respect to
their EOP Partnership Units received in the Partnership Merger than would have
been the case if the Partnership Merger had not occurred.
 
     If any asset deemed contributed by Beacon Partnership to EOP Partnership in
the Partnership Merger has a Book-Tax Difference and subsequently is sold by EOP
Partnership, any such Book-Tax Difference remaining at the time the asset is
sold would be required to be allocated exclusively to the holders of EOP
Partnership Units who were previously holders of Beacon Partnership Units
(including EOP, as successor to Beacon's Beacon Partnership Units), even though
the proceeds of such sale would be allocated proportionately among all holders
of EOP Partnership Units. Under the traditional method that will be used by EOP
Partnership, however, the gain required to be specially allocated under these
rules would not exceed the gain that is actually recognized by EOP Partnership
in connection with the sale (unlike under certain alternative methods of
allocation available, whereby the gain allocated to the former partners of
Beacon Partnership could exceed the gain actually recognized by EOP
Partnership).
 
     The Partnership Agreement also requires that any gain allocated to the EOP
Unitholders upon the sale or other taxable disposition of any EOP Partnership
asset shall, to the extent possible, after taking into account other required
allocations of gain pursuant to the EOP Partnership Agreement, be characterized
as recapture income in the same proportions and to the same extent as such EOP
Unitholders previously have been
 
                                       211
<PAGE>   220
 
allocated any deductions directly or indirectly giving rise to the treatment of
such gains as recapture income (including by reason of any deductions previously
allocated to them as holders of Beacon Partnership Units or as owners of
properties that were contributed to Beacon Partnership).
 
     DISSOLUTION OF EOP PARTNERSHIP.  In the event of the dissolution of EOP
Partnership, see "Description of EOP Partnership Units," a distribution of EOP
Partnership property (other than money) will not result in taxable gain to a
holder of EOP Partnership Units (except to the extent provided in Sections 737,
704(c)(1)(B) and 731(c) of the Code). A holder of EOP Partnership Units will
hold such distributed property with a basis equal to the adjusted basis of such
EOP Partnership Units, reduced by any money distributed in liquidation. Further,
the liquidation of EOP Partnership will be taxable to a holder of EOP
Partnership Units to the extent that any money distributed in liquidation
(including any money deemed distributed as a result of relief from liabilities)
exceeds such holder's tax basis in its EOP Partnership Units. If EOP were to
issue EOP Common Shares to EOP Unitholders upon dissolution of EOP Partnership,
an EOP Unitholder likely would be treated as if it had exchanged its EOP
Partnership Units for EOP Common Shares and would recognize gain or loss as if
such EOP Partnership Units were sold in a fully taxable exchange. See "-- Tax
Treatment of Redemption of Units," below.
 
     LIMITATIONS ON DEDUCTIBILITY OF LOSSES; TREATMENT OF PASSIVE ACTIVITIES AND
PORTFOLIO INCOME.  The passive loss limitations generally provide that
individuals, estates, trusts and certain closely held corporations and personal
service corporations can deduct losses from passive activities (generally,
activities in which the taxpayer does not materially participate, which would
include EOP Partnership with respect to any former Beacon Unitholders) only to
the extent that such losses are not in excess of the taxpayer's income from
passive activities or investments. If EOP Partnership were to be classified as a
publicly traded partnership under the Code (see "Tax Status of EOP Partnership"
above), any losses or deductions allocable to a holder of EOP Partnership Units
could be used only against gains or income of EOP Partnership and could not be
used to offset passive income from other passive activities. Similarly, any EOP
Partnership income or gain allocable to a holder of EOP Partnership Units could
not be offset with losses from other passive activities of such holder.
 
     In addition to the foregoing limitations, a holder of EOP Partnership Units
may not deduct from taxable income its share of EOP Partnership losses, if any,
to the extent that such losses exceed the lesser of (i) the adjusted tax basis
of its EOP Partnership Units at the end of EOP Partnership's taxable year in
which the loss occurs and (ii) the amount for which such holder is considered
"at risk" at the end of that year. In general, a holder of EOP Partnership Units
will initially be "at risk" to the extent of the basis in its EOP Partnership
interest (unless it borrowed amounts on a nonrecourse basis to acquire such
interests), including for such purposes only such holder's share of EOP
Partnership's liabilities, as determined under Section 752 of the Code, that are
considered "qualified nonrecourse financing" for purposes of the "at risk"
rules. After consummation of the Partnership Merger, in general, a holder's
at-risk amount will increase or decrease as the adjusted basis in its EOP
Partnership Units increases or decreases. Losses disallowed to a holder of EOP
Partnership Units as a result of these rules can be carried forward and may be
allowable to such holder to the extent that his adjusted basis or at-risk amount
(whichever was the limiting factor) is increased in a subsequent year. The
at-risk rules apply to an individual partner, an individual shareholder of a
corporate partner that is an S corporation and a corporate partner if fifty
percent (50%) or more of the value of stock of such corporate partner is owned
directly or indirectly by five or fewer individuals at any time during the last
half of the taxable year. The at risk provisions of the Code generally do not
apply to real property placed in service by a taxpayer prior to January 1, 1987,
or to an interest in a partnership acquired before that date. It is possible
that a former Beacon Unitholder whose Beacon Partnership Units were not
previously subject to the at-risk rules may be subject to the at-risk rules
following the Partnership Merger.
 
     SECTION 754 ELECTION.  It is anticipated that EOP Partnership will make the
election permitted by Section 754 of the Code, effective for its taxable year
ending December 31, 1997. This election is irrevocable without the consent of
the IRS. The election will generally permit a purchaser of EOP Partnership Units
(including EOP, to the extent that it acquires EOP Partnership Units in
connection with the exercise by an EOP Unitholder of its Unit Redemption Right)
to adjust its share of the basis in EOP Partnership's properties ("inside
basis") pursuant to Section 743(b) of the Code to fair market value (as
reflected by the value of consideration paid for the EOP Partnership Units), as
if such purchaser had acquired a direct interest in EOP
 
                                       212
<PAGE>   221
 
Partnership's assets. The Section 743(b) adjustment is attributed solely to a
purchaser of EOP Partnership Units and is not added to the bases of EOP
Partnership's assets associated with all of the EOP Unitholders. An acquirer of
EOP Partnership Units (such as EOP when it acquires EOP Partnership Units from
EOP Unitholders upon a redemption of EOP Partnership Units) that obtains a
Section 743(b) adjustment by reason of such acquisition will be allowed
depreciation with respect to such adjustment beginning on the date of the
acquisition as if it were new property placed in service as of that date. A
similar basis adjustment would be permitted for EOP Partnership when there is a
distribution (or deemed distribution) to an EOP Unitholder that results in the
recognition of taxable gain to such EOP Unitholder.
 
     DISPOSITION OF EOP PARTNERSHIP UNITS BY EOP UNITHOLDERS.  If an EOP
Partnership Unit is sold or otherwise disposed of, the determination of gain or
loss from the sale or other disposition will be based on the difference between
the amount realized and the tax basis for such EOP Partnership Unit. Upon the
sale of an EOP Partnership Unit, the "amount realized" will be measured by the
sum of the cash and fair market value of other property received for the EOP
Partnership Unit plus the portion of EOP Partnership's liabilities considered
allocable to the EOP Partnership Unit sold. Similarly, upon a gift of an EOP
Partnership Unit, an EOP Unitholder will be deemed to have realized an amount
with respect to the portion of EOP Partnership's nonrecourse liabilities
considered allocable to such EOP Partnership Unit. To the extent that the sum of
the amount of cash or property received and the allocable share of EOP
Partnership's nonrecourse liabilities exceeds the holder's basis for the EOP
Partnership Unit disposed of, such EOP Unitholder will recognize gain. The tax
liability resulting from such gain could exceed the amount of cash received upon
such disposition.
 
     To the extent that the amount realized upon the sale of an EOP Partnership
Unit attributable to an EOP Unitholder's share of "unrealized receivables" of
EOP Partnership (as defined in Section 751 of the Code) exceeds the basis
attributable to those assets, such excess will be treated as ordinary income.
Unrealized receivables include, to the extent not previously includible in EOP
Partnership income, any rights to payment for services rendered or to be
rendered. Unrealized receivables also include amounts that would be subject to
recapture as ordinary income if EOP Partnership had sold its assets at their
fair market value at the time of the transfer of an EOP Partnership Unit, such
as "depreciation recapture" under Sections 1245 and 1250 of the Code.
 
     TAX TREATMENT OF REDEMPTIONS OF EOP PARTNERSHIP UNITS.  If a holder of EOP
Partnership Units exercises its Unit Redemption Right, it is generally
anticipated that EOP will elect to exercise its right (under the EOP Partnership
Agreement) to acquire a redeeming EOP Unitholder's EOP Partnership Units in
exchange for cash or EOP Common Shares; however, EOP is under no obligation to
exercise such right. In the event that EOP does so elect, such transaction will
be a fully taxable sale to the redeeming EOP Unitholder and such redeeming EOP
Unitholder will be treated as realizing an amount equal to the amount of the
cash or the value of the Common Shares received in the exchange plus the amount
of EOP Partnership liabilities considered allocable to the redeemed EOP
Partnership Units at the time of the redemption.
 
     If EOP does not elect to assume the obligation to redeem an EOP
Unitholder's EOP Partnership Units, EOP Partnership is required to redeem such
EOP Partnership Units for cash. If EOP Partnership redeems EOP Partnership Units
for cash that EOP contributes to EOP Partnership to effect such redemption, the
redemption likely will be treated as a sale of such EOP Partnership Units to EOP
in a fully taxable transaction, although the matter is not free from doubt. In
that event, the redeeming EOP Unitholder will be treated as realizing an amount
equal to the amount of the cash received in the exchange plus the amount of EOP
Partnership liabilities considered allocable to the redeemed EOP Partnership
Units at the time of the redemption. If, instead, EOP Partnership redeems an EOP
Unitholder's EOP Partnership Units for cash that is not contributed by EOP to
effect the redemption, the tax consequences will be the same as described in the
previous sentence, except that, if EOP Partnership redeems less than all of an
EOP Unitholder's EOP Partnership Units, the EOP Unitholder will not be permitted
to recognize any taxable loss in connection with the redemption and will
recognize taxable gain on the redemption only to the extent that the cash, plus
the share of EOP Partnership liabilities allocable to the redeemed EOP
Partnership Units, exceeds the EOP Unitholder's adjusted basis in all of such
EOP Unitholder's EOP Partnership Units immediately before the redemption (rather
than just the basis in the EOP Partnership Units redeemed).
 
                                       213
<PAGE>   222
 
     EOP PARTNERSHIP INCOME TAX INFORMATION RETURNS AND EOP PARTNERSHIP AUDIT
PROCEDURES.  EOP Partnership will use reasonable efforts to furnish the EOP
Unitholders (including former Beacon Unitholders) with the tax information
reasonably required by EOP Unitholders for federal and state income tax
reporting purposes within 90 days after the close of each EOP Partnership
taxable year.
 
     The federal income tax information returns filed by EOP Partnership may be
audited by the IRS. The Code contains partnership audit procedures governing the
manner in which Service audit adjustments of partnership items are resolved. For
taxable years beginning after December 31, 1997 (the first available year), EOP
Partnership may be able to elect the simplified pass-through system for audits
that was enacted as part of the Taxpayer Relief Act of 1997 (the "Act"). Such
election is available to partnerships that have 100 or more partners and meet
certain other requirements set forth in the Act. EOP Partnership has not yet
determined whether it would be eligible to make such election or whether it
would make such an election even if it were eligible. For its taxable year
ending December 31, 1997, EOP Partnership will be subject to existing audit
rules which were enacted as part of the Tax Equity and Fiscal Responsibility Act
of 1982 ("TEFRA").
 
     Partnerships generally are treated as separate entities for purposes of
federal tax audits, judicial review of administrative adjustments by the IRS and
tax settlement proceedings. The tax treatment of partnership items of income,
gain, loss, deduction and credit is determined at the partnership level in a
unified partnership proceeding, rather than in separate proceedings with each
partner. The Code provides for one partner to be designated as the "Tax Matters
Partner" for these purposes. The EOP Partnership Agreement appoints EOP as the
Tax Matters Partner for EOP Partnership.
 
     The Tax Matters Partner is authorized, but not required, to take certain
actions on behalf of EOP Partnership and the EOP Unitholders and can extend the
statute of limitations for assessment of tax deficiencies against EOP
Unitholders with respect to EOP Partnership items. The Tax Matters Partner will
make a reasonable effort to keep each EOP Unitholder informed of administrative
and judicial tax proceedings with respect to EOP Partnership items to the extent
required pursuant to Treasury Regulations issued under Section 6223 of the Code.
In connection with adjustments to EOP Partnership tax returns proposed by the
IRS, the Tax Matters Partner may bind any EOP Unitholder with less than a one
percent (1%) profits interest in EOP Partnership to a settlement with the IRS
unless the EOP Unitholder elects, by filing a statement with the IRS, not to
give such authority to the Tax Matters Partner. The Tax Matters Partner may seek
judicial review (to which all the EOP Unitholders are bound) of a final EOP
Partnership administrative adjustment and, if the Tax Matters Partner fails to
seek judicial review, such review may be sought by any EOP Unitholder having at
least a one percent (1%) interest in the profits of EOP Partnership and by EOP
Unitholders having, in the aggregate, at least a five percent (5%) profits
interest. Only one judicial proceeding will go forward, however, and each EOP
Unitholder with an interest in the outcome may participate.
 
     The EOP Unitholders will generally be required to treat EOP Partnership
items on their federal income tax returns in a manner consistent with the
treatment of the items on EOP Partnership information return. In general, that
consistency requirement is waived if the EOP Unitholder files a statement with
the IRS identifying the inconsistency. Failure to satisfy the consistency
requirement, if not waived, will result in an adjustment to conform the
treatment of the item by the EOP Unitholder to the treatment on EOP Partnership
return. Even if the consistency requirement is waived, adjustments to the EOP
Unitholder's tax liability with respect to EOP Partnership items may result from
an audit of EOP Partnership's or the EOP Unitholder's tax return. Intentional or
negligent disregard of the consistency requirement may subject an EOP Unitholder
to substantial penalties. In addition, an audit of the EOP Partnership return
may also lead to an audit of an individual EOP Unitholder's tax return and such
audit could result in adjustment of nonpartnership items.
 
     If a partnership makes an election under the Act, similar to the audit
proceedings for other partnerships under the TEFRA rules, the Internal Revenue
Service may challenge a reporting position taken by an electing large
partnership by conducting a single administrative proceeding, the outcome of
which will bind all partners. However, unlike partners in a TEFRA partnership,
partners in an electing large partnership under the Act have no individual right
to notice of the adjustment proceedings and no individual right to participate
in the proceedings. Like other partnerships, an electing partnership may request
judicial review of a
 
                                       214
<PAGE>   223
 
partnership adjustment. However, unlike partnerships governed by TEFRA, the
individual partners in an electing large partnership have no right to file
petitions for readjustment of the partnership items.
 
     A partner in an electing large partnership must report all partnership
items consistently with their treatment on the partnership return. Unlike the
comparable TEFRA audit rule, an inconsistency cannot be excused by notifying the
IRS of the differing treatment. Partners who fail to report partnership items
consistently with their treatment on the partnership return are subject to
accuracy-related and fraud penalties.
 
     ALTERNATIVE MINIMUM TAX ON ITEMS OF TAX PREFERENCE.  The Code contains
different sets of minimum tax rules applicable to corporate and noncorporate
taxpayers. EOP Partnership will not be subject to the alternative minimum tax,
but the Partners are required to take into account on their own tax returns
their respective shares of EOP Partnership's tax preference items and
adjustments in order to compute alternative minimum taxable income. SINCE THE
IMPACT OF THE ALTERNATIVE MINIMUM TAX DEPENDS ON EACH EOP UNITHOLDER'S
PARTICULAR SITUATION, THE FORMER BEACON UNITHOLDERS ARE URGED TO CONSULT THEIR
OWN TAX ADVISORS AS TO THE APPLICABILITY OF THE ALTERNATIVE MINIMUM TAX
FOLLOWING CONSUMMATION OF THE PARTNERSHIP MERGER.
 
     STATE AND LOCAL TAXES.  In addition to the federal income tax aspects
described above, an EOP Unitholder should consider the potential state and local
tax consequences of owning EOP Partnership Units. Tax returns may be required
and tax liability may be imposed both in the state or local jurisdictions where
an EOP Unitholder resides and in each state or local jurisdiction in which EOP
Partnership has assets or otherwise does business. Thus, persons holding EOP
Partnership Units in EOP Partnership either directly or through one or more
partnerships or limited liability companies may be subject to state and local
taxation in a number of jurisdictions in which EOP Partnership directly or
indirectly holds real property and would be required to file periodic tax
returns in those jurisdictions. In this regard, immediately following the
Partnership Merger, EOP Partnership will own properties in, or otherwise conduct
business in, 20 states and the District of Columbia. EOP Partnership anticipates
providing the EOP Unitholders with any information reasonably necessary to
permit them to satisfy state and local return filing requirements. To the extent
that an EOP Unitholder pays income tax with respect to EOP Partnership to a
state where it is not resident (or EOP Partnership is required to pay such tax
on behalf of the EOP Unitholder), the EOP Unitholder may be entitled, in whole
or in part, to a deduction or credit against income tax that otherwise would be
owed to his state of residence with respect to the same income. An EOP
Unitholder should consult with his personal tax advisor with respect to the
state and local income tax implications for such EOP Unitholder of owning EOP
Partnership Units.
 
TAXATION OF EOP AS A REIT -- GENERAL
 
     EOP plans to make an election to be taxed as a REIT under Sections 856
through 860 of the Code, commencing with its taxable year ending December 31,
1997, when it files its federal income tax return for 1997. EOP believes that,
commencing with its formation on July 11, 1997, it has been organized and has
operated in such a manner so as to qualify for taxation as a REIT under the
Code. Beacon currently has in effect an election to be taxed as a REIT under
Sections 856 through 860 of the Code. Beacon believes that, since its inception
in 1994, it has been organized and has operated in such a manner so as to
qualify for taxation as a REIT under the Code. As a result of the Merger,
Beacon's separate existence will cease as of the Effective Time. Accordingly,
the following discussion summarizes only the taxation of EOP subsequent to the
Effective Time. Prior to the Effective Time, the taxation of Beacon as a REIT is
substantially similar to that described herein with respect to EOP.
 
     EOP's continued qualification as a REIT after the Merger could depend in
part upon Beacon's qualification as a REIT immediately prior to the Merger. In
this regard, as a condition to the Merger, EOP will obtain an opinion from
Goodwin, Procter & Hoar to the effect that Beacon, commencing with its taxable
year ended December 31, 1994, through its short taxable year ending at the
Effective Time, was organized and has operated in conformity with the
requirements for qualification as a REIT. The opinion of Goodwin, Procter & Hoar
will be conditioned upon certain representations made by Beacon as to factual
matters relating
 
                                       215
<PAGE>   224
 
to the organization and operation of Beacon, the Beacon Partnership and their
affiliates. In addition, this opinion will be based upon the timely completion
of all actions described in this Proxy Statement/Prospectus (including payment
of the Beacon Pre-Merger Distribution) and upon the assumption that EOP, on
behalf of Beacon, will send the shareholder demand letters required to be
delivered with respect to Beacon's taxable year ending at the time of the Merger
and that EOP will maintain such record of Beacon as required to comply with the
REIT record keeping requirements.. Beacon intends to continue to operate in a
manner so as to qualify as a REIT through the Effective Time of the Merger, but
no assurance can be given that Beacon will qualify or remain qualified as a REIT
for such period. Moreover, such qualification and taxation as a REIT depends
upon Beacon's ability to meet (through actual annual operating results,
distribution levels and diversity of share ownership) through the Effective Time
the various REIT qualification tests imposed under the Code, the results of
which will not be reviewed by Goodwin, Procter & Hoar. Accordingly, no assurance
can be given that the actual results of Beacon's operations for any particular
taxable year will satisfy such requirements.
 
     Hogan & Hartson, counsel to EOP in connection with the Merger, will deliver
an opinion to each of EOP and Beacon to the effect that, commencing with EOP's
taxable year ending December 31, 1997, EOP has been organized and has operated
in a manner so as to qualify as a REIT, and that after giving effect to the
consummation of the Merger, EOP's proposed method of operation will enable it to
continue to qualify as a REIT. This opinion will be conditioned upon certain
representations made by EOP and the ZML REITs as to factual matters relating to
the organization and operation of EOP, EOP Partnership and the ZML Opportunity
Partnerships (and the previous organization and operation of the ZML REITs,
which were combined to form EOP). In addition, this opinion will be based upon
the factual representations of EOP concerning its business and properties as set
forth in this Proxy Statement/Prospectus and the timely completion of all
actions described in this Proxy Statement/Prospectus (including EOP making an
election to be taxed as a REIT with its federal income tax return for the year
ending December 31, 1997). Finally, to the extent that the opinion of Hogan &
Hartson addresses the continued qualification of EOP as a REIT following the
Merger, it will be based in part upon the opinion of Goodwin, Procter & Hoar
described above as to the qualification of Beacon as a REIT and the
representations made by Beacon in connection therewith as described above. EOP
intends to continue to operate in a manner so as to qualify as a REIT following
the Effective Time, but no assurance can be given that EOP will qualify or
remain qualified as a REIT. Moreover, such qualification and taxation as a REIT
depends upon EOP's ability to meet on a ongoing basis (through actual annual
operating results, distribution levels and diversity of share ownership) the
various qualification tests imposed under the Code discussed below, the results
of which will not be reviewed by Hogan & Hartson. Accordingly, no assurance can
be given that the actual results of EOP's operations for any particular taxable
year will satisfy such requirements. See "-- Requirements for Qualification as a
REIT -- Failure of EOP to Qualify as a REIT."
 
     The sections of the Code and the corresponding Treasury Regulations
relating to qualification and operation as a REIT are highly technical and
complex. The following discussion sets forth certain material aspects of the
rules that govern the federal income tax treatment of a REIT and its
shareholders. The discussion is qualified in its entirety by the applicable Code
provisions, Treasury Regulations and administrative and judicial interpretations
thereof, all of which are subject to change prospectively or retroactively.
 
     So long as EOP qualifies for taxation as a REIT, it generally will not be
subject to federal corporate income taxes on its net income that is distributed
currently to EOP Shareholders. This treatment substantially eliminates the
"double taxation" (i.e., taxation at both the corporate and shareholder levels)
that generally results from investment in a regular corporation. However, EOP
will be subject to federal income tax in the following circumstances. First, EOP
will be taxed at regular corporate rates on any undistributed REIT taxable
income, including undistributed net capital gains. Second, under certain
circumstances, EOP may be subject to the "alternative minimum tax" on any items
of tax preference. Third, if EOP has (i) net income from the sale or other
disposition of certain "foreclosure property" that is held primarily for sale to
customers in the ordinary course of business or (ii) other nonqualifying income
from foreclosure property, it will be subject to tax at the highest corporate
rate on such income. Fourth, if EOP has net income from prohibited transactions
(which are, in general, certain sales or other dispositions of property (other
than foreclosure
 
                                       216
<PAGE>   225
 
property) held primarily for sale to customers in the ordinary course of
business), such income will be subject to a 100% tax. Fifth, if EOP should fail
to satisfy the 75% gross income test or the 95% gross income test (discussed
below), and nonetheless should maintain its qualification as a REIT because
certain other requirements have been met, it will be subject to a 100% tax on
the net income attributable to the greater of either the amount by which it
fails the 75% gross income test or the amount by which it fails the 95% gross
income test. Sixth, if EOP should fail to distribute during each calendar year
at least the sum of (i) 85% of its REIT ordinary income for such year, (ii) 95%
of its REIT capital gain net income for such year, and (iii) any undistributed
taxable income from prior periods, it would be subject to a 4% excise tax on the
excess of such required distribution over the amounts actually distributed.
Seventh, if EOP acquires or has acquired (or if Beacon has acquired) any asset
from a C corporation (i.e., a corporation generally subject to full corporate-
level tax) in a transaction in which the basis of the asset in the acquiror's
hands is determined by reference to the basis of the asset (or any other asset)
in the hands of the C corporation and the acquiror recognizes gain on the
disposition of such asset during the 10 year period beginning on the date on
which such asset was acquired by it, then to the extent of such asset's
"Built-In Gain" (i.e., the excess of (a) the fair market value of such asset at
the time of the acquisition by EOP (or Beacon) over (b) the adjusted basis in
such asset, determined as of the time of such acquisition), such gain will be
subject to tax at the highest regular corporate rate applicable, pursuant to
anticipated Treasury Regulations that have not yet been promulgated.
 
     The results described above with respect to the recognition of Built-In
Gain assume that EOP will make (or that Beacon made, if applicable) an election
pursuant to IRS Notice 88-19 with respect to any such acquisition. In this
regard, the Built-In Gain rules would apply with respect to any assets acquired
by EOP from a ZML REIT or Beacon if either such ZML REIT had failed, or Beacon
has failed, to qualify, for any reason, as a REIT throughout the duration of its
existence. If EOP were not to make an election pursuant to IRS Notice 88-19 (or
that election no longer were available because of a change in applicable law)
and a ZML REIT or Beacon failed to qualify as a REIT at the time of its merger
with EOP, the entity that failed to so qualify would recognize taxable gain on
such merger under the Built-In Gain rules, notwithstanding that such merger
otherwise qualified as a "tax-free reorganization." EOP believes that each of
the ZML REITs qualified as a REIT at the time of its merger into EOP, and EOP
will receive an opinion to such effect with respect to Beacon from Goodwin,
Procter & Hoar, counsel to Beacon, but EOP intends to make a protective election
under Notice 88-19 with respect to the merger of each of the ZML REITs and
Beacon in order to avoid the adverse consequences that otherwise could result.
 
REQUIREMENTS FOR QUALIFICATION AS A REIT
 
     The Code defines a REIT as a corporation, trust or association (i) that is
managed by one or more trustees or directors; (ii) the beneficial ownership of
which is evidenced by transferable shares, or by transferable certificates of
beneficial interest; (iii) that would be taxable as a domestic corporation, but
for sections 856 through 860 of the Code; (iv) that is neither a financial
institution nor an insurance company subject to certain provisions of the Code;
(v) the beneficial ownership of which is held by 100 or more persons; (vi) not
more than 50% in value of the outstanding shares of which is owned directly or
indirectly by five or fewer individuals (as defined in the Code to include
certain entities) during the last half of each taxable year (the "5/50 Rule");
(vii) that makes an election to be a REIT (or has made such election for a
previous taxable year which has not been revoked or terminated) and satisfies
all relevant filing and other administrative requirements established by the IRS
that must be met in order to elect and maintain REIT status; (viii) that uses a
calendar year for federal income tax purposes and complies with the
recordkeeping requirements of the Code and Treasury Regulations promulgated
thereunder; and (ix) that meets certain other tests, described below, regarding
the nature of its income and assets. The Code provides that conditions (i) to
(iv) inclusive, must be met during the entire taxable year and that condition
(v) must be met during at least 335 days of a taxable year of 12 months, or
during a proportionate part of a taxable year of less than 12 months. For
purposes of determining stock ownership under the 5/50 Rule, a supplemental
unemployment compensation benefits plan, a private foundation or a portion of a
trust permanently set aside or used exclusively for charitable purposes
generally is considered an individual. However, a trust that is a qualified
trust under Code Section 401(a) generally is not considered an individual and
beneficiaries of such trust are
 
                                       217
<PAGE>   226
 
treated as holding shares of a REIT in proportion to their actuarial interests
in such trust for purposes of the 5/50 Rule.
 
     EOP believes that it has issued sufficient EOP Common Shares with
sufficient diversity of ownership to allow it to satisfy the conditions
described in clauses (v) and (vi) above. In addition, the Declaration of Trust
contains restrictions regarding the transfer of EOP Common Shares and EOP
Preferred Shares that are intended to assist EOP in continuing to satisfy the
share ownership requirements described in clauses (v) and (vi) above. (The
Beacon Articles contain similar restrictions with respect to Beacon Common
Shares and Beacon Preferred Shares.) Such ownership and transfer restrictions
are described in "SHARES OF BENEFICIAL INTEREST -- Restrictions on Ownership and
Transfer." These restrictions, however, may not ensure that EOP will, in all
cases, be able to satisfy the share ownership requirements described above. If
EOP fails to satisfy such share ownership requirements, EOP's status as a REIT
will terminate. See "-- Requirements for Qualification as a REIT -- Failure of
EOP to Qualify as a REIT."
 
     In connection with the 5/50 Rule, a REIT is required to send annual letters
to its shareholders requesting information regarding the actual ownership of its
shares. Pursuant to the Taxpayer Reform Act of 1997 (the "1997 Act"), for EOP's
taxable years beginning on or after January 1, 1998, if EOP complies with the
annual letters requirement and it does not know or, exercising reasonable
diligence, would not have known of its failure to meet the 5/50 Rule, then it
will be treated as having met the 5/50 Rule. Under current law applicable for
EOP's taxable year ending December 31, 1997, failure to send such annual letters
could result in termination of EOP's REIT election. The 1997 Act imposes a
monetary penalty for failure to send the annual letters in lieu of termination
of REIT status.
 
     In order to qualify as a REIT, EOP cannot have at the end of any taxable
year any undistributed "earnings and profits" that are attributable to a "C
corporation" taxable year. EOP itself was a newly formed entity in 1997 and will
make a REIT election for its first taxable year ending December 31, 1997. Hence,
EOP itself will not have any undistributed "C corporation earnings and profits."
However, EOP succeeded to various tax attributes of the ZML REITs, including any
undistributed "earnings and profits." If each ZML REIT qualified as a REIT
throughout the duration of its existence, then any undistributed "earnings and
profits" to which EOP succeeded will not be "C corporation earnings and profits"
and EOP will satisfy this requirement. If, however, one or more of the ZML REITs
failed to qualify as a REIT throughout the duration of its existence, then it
might have had undistributed "C corporation earnings and profits" that, if not
distributed by EOP prior to the end of its first taxable year, could prevent EOP
from qualifying as a REIT. EOP believes that each ZML REIT qualified as a REIT
throughout the duration of its existence and that, in any event, no ZML REIT
should be considered to have had any undistributed "C corporation earnings and
profits" at the time of its merger into EOP. There can be no assurance, however,
that the IRS would not contend otherwise on a subsequent audit of one or more of
the ZML REITs. Recently finalized Treasury Regulations provide for certain
"deficiency distribution" procedures. Although the application of these Treasury
Regulations is not entirely clear, it appears that EOP may be able to use such
"deficiency distribution" procedures to distribute any "C corporation earnings
and profits" deemed to have been acquired from a ZML REIT. In order to use this
procedure, EOP would have to make an additional distribution to EOP Shareholders
(in addition to distributions made for purposes of satisfying the normal REIT
distribution requirements), within 90 days of the IRS determination. In
addition, EOP would have to pay to the IRS an interest charge on 50% of the
acquired "C corporation earnings and profits" that were not distributed prior to
the end of EOP's taxable year ending December 31, 1997. There can be no
assurance, however, that the IRS would not take the position either that the
procedure is not available at all (in which case EOP would fail to qualify as a
REIT) or, alternatively, that even if the procedure is available, EOP cannot
qualify as a REIT for its taxable year ending December 31, 1997, but it could
qualify as a REIT for subsequent years.
 
     Finally, if EOP were considered a "successor" to any ZML REIT and such ZML
REIT were determined not to have qualified as a REIT, EOP would not be eligible
to elect REIT status for up to four years after the year in which such ZML REIT
first failed to qualify as a REIT. EOP would be considered a "successor" for
these purposes, however, only if (i) persons who own more than 50% of the EOP
Common Shares at any time during EOP's taxable year ending December 31, 1997,
owned, directly or indirectly, 50% or more in value of the shares of such ZML
REIT during the first year in which it ceased to qualify as a REIT and (ii) a
 
                                       218
<PAGE>   227
 
significant portion of EOP's assets were assets owned by such ZML REIT. Hogan &
Hartson's opinion as to the qualification of EOP as a REIT under the Code is not
based upon, or limited by, an assumption or representation that the ZML REITs
have qualified as REITs for federal income tax purposes.
 
     The same considerations apply with respect to EOP's continued qualification
as a REIT if Beacon has failed to qualify as a REIT throughout the duration of
its existence. Beacon believes, however, that it has qualified as a REIT for
each of its taxable years commencing with the year ending December 31, 1994,
(the year of Beacon's formation), and EOP will receive an opinion to such effect
from Goodwin Procter & Hoar, as a condition to the consummation of the Merger.
 
     CLOSING AGREEMENTS WITH THE IRS WITH RESPECT TO ZML REITS I AND II.  In
December 1996, the IRS was advised that ZML REIT I and ZML REIT II each had
failed to comply with a technical requirement of a provision of the Code which
must be satisfied for a company to qualify as a REIT for federal income tax
purposes. More specifically, in connection with structuring certain real estate
investments made by ZML Opportunity Partnership I and ZML Opportunity
Partnership II during the period 1991-1993, all of the voting stock of certain
corporations formed to serve as general partners of limited partnership
subsidiaries of such ZML Opportunity Partnerships was issued to such ZML
Opportunity Partnerships. Based upon a Treasury Regulation interpreting the
statutory provision limiting permitted REIT investments, a portion of such ZML
Opportunity Partnerships' ownership of corporate voting stock would be imputed
to ZML REIT I and ZML REIT II and, in so doing, would cause ZML REIT I and ZML
REIT II to violate the prohibition on a REIT owning more than 10% of the voting
stock of a corporation other than a qualified REIT subsidiary.
 
     Pursuant to closing agreements, the IRS agreed that neither ZML REIT I nor
ZML REIT II would be disqualified as a REIT as a result of the technical
violations disclosed to the IRS. In connection with the agreements, the ZML
Partners of ZML Opportunity Partnership I and ZML Opportunity Partnership II
made certain payments to the IRS. As a result of the closing agreements, the
technical violations discussed above have caused no adverse impact on either the
REIT status of ZML REIT I and ZML REIT II for the tax years at issue, or EOP's
subsequent ability to qualify as a REIT.
 
     QUALIFIED REIT SUBSIDIARIES.  Section 856(i) of the Code provides that a
corporation that is a "qualified REIT subsidiary" shall not be treated as a
separate corporation, and all assets, liabilities and items of income, deduction
and credit of a "qualified REIT subsidiary" shall be treated as assets,
liabilities and items of income, deduction and credit of the REIT. For EOP's
taxable year ending December 31, 1997, a "qualified REIT subsidiary" is a
corporation, all of the capital stock of which has been held by the REIT at all
times during the period such corporation was in existence. Pursuant to the 1997
Act, for EOP's taxable years beginning on or after January 1, 1998, a "qualified
REIT subsidiary" is a corporation all of the capital stock of which is owned by
the REIT. Pursuant to this amendment, EOP will have the ability, if it so
chooses, to acquire an existing corporation that will qualify as a "qualified
REIT subsidiary," as opposed to having to form such a subsidiary. EOP currently
has one "qualified REIT subsidiary." EOP may form or acquire additional
"qualified REIT subsidiaries" in the future. Beacon does not have and will not
have the at Effective Time of the Merger, any "qualified REIT subsidiaries." In
applying the income and asset tests described below, a "qualified REIT
subsidiary" will be ignored and all assets, liabilities and items of income,
deduction and credit of such "qualified REIT subsidiary" will be treated as
assets, liabilities and items of income, deduction and credit of EOP. A
"qualified REIT subsidiary" of EOP will not be subject to federal corporate
income taxation, although it may be subject to state and local taxation in
certain states.
 
     OWNERSHIP OF PARTNERSHIP INTERESTS BY A REIT.  In the case of a REIT which
is a partner in a partnership, Treasury Regulations provide that the REIT will
be deemed to own its proportionate share of the assets of the partnership and
will be deemed to be entitled to the income of the partnership attributable to
such share. In addition, the character of the assets and gross income of the
partnership retain the same character in the hands of the REIT for purposes of
Section 856 of the Code, including satisfying the gross income tests and the
asset tests. Thus, EOP's proportionate share of the assets and items of income
of EOP Partnership (including EOP Partnership's share of such items of any
subsidiaries of EOP Partnership that are partnerships or LLCs, including those
partnership or LLC subsidiaries that EOP Partnership acquires as a result of the
merger of Beacon Partnership into EOP Partnership) will be treated as assets and
items of
 
                                       219
<PAGE>   228
 
income of EOP for purposes of applying the requirements described herein. EOP
has direct control of EOP Partnership, each of the ZML Opportunity Partnerships,
and each partnership or LLC subsidiary of EOP Partnership and intends to operate
them in a manner that is consistent with the requirements for qualification of
EOP as a REIT.
 
     INCOME TESTS APPLICABLE TO REITS.  In order to qualify as a REIT, EOP must
satisfy two gross income tests (three gross income tests for the taxable year
ending December 31, 1997). First, at least 75% of EOP's gross income (excluding
gross income from prohibited transactions) for such taxable year must be derived
directly or indirectly from investments relating to real property or mortgages
on real property (including "rents from real property," gains on the disposition
of real estate, dividends paid by another REIT and, in certain circumstances,
interest) or from certain types of temporary investments. Second, at least 95%
of EOP's gross income (excluding gross income from "prohibited transactions")
for such taxable year must be derived from such real property investments,
dividends, interest, certain payments under hedging instruments and gain from
the sale or disposition of stock, securities and certain hedging instruments (or
from any combination of the foregoing). Third, for the taxable year ending
December 31, 1997, short-term gain from the sale or other disposition of stock
or securities, gain from prohibited transactions and gain on the sale or other
disposition of real property held for less than four years (apart from
involuntary conversions and sales of foreclosure property) must represent less
than 30% of EOP's gross income (including gross income from "prohibited
transactions"). The 1997 Act repealed the 30% gross income test for taxable
years beginning on or after January 1, 1998.
 
     Rents received by EOP will qualify as "rents from real property" in
satisfying the gross income requirements for a REIT described above only if
several conditions are met. First, the amount of rent must not be based in whole
or in part on the income or profits of any person. However, an amount received
or accrued generally will not be excluded from the term "rents from real
property" solely by reason of being based on a fixed percentage or percentages
of receipts or sales. Second, rents received from a tenant will not qualify as
"rents from real property" in satisfying the gross income tests if the REIT, or
an actual or constructive owner of 10% or more of the REIT, actually or
constructively owns 10% or more of such tenant (a "Related Party Tenant").
Third, if rent attributable to personal property, leased in connection with a
lease of real property, is greater than 15% of the total rent received under the
lease, then the portion of rent attributable to such personal property will not
qualify as "rents from real property."
 
     For the taxable year ending December 31, 1997, rents received by the REIT
generally will fail to qualify as "rents from real property" for the purpose of
satisfying the gross income tests if the REIT operates or manages the property
or furnishes or renders services to the tenants of such property, other than
through an independent contractor from whom the REIT derives no revenue. Due to
certain changes in this requirement enacted as part of the 1997 Act for taxable
years beginning on or after January 1, 1998, a REIT may provide de minimis
services directly to the tenants of a property, provided, however, that if (i)
the REIT operates or manages a property or furnishes or renders services to the
tenants at the property other than through an independent contractor from whom
the REIT derives no revenue (not including services "usually or customarily
rendered" in connection with the rental of real property and not otherwise
considered "rendered to the occupant"), and (ii) the amount received for so
doing (the "Impermissible Tenant Service Income") exceeds one percent of the
total amount received by the REIT with respect to the property, then no amount
received by the REIT with respect to the property will qualify as "rents from
real property." If the Impermissible Tenant Service Income is one percent or
less of the total amount received by the REIT with respect to the property, then
only the Impermissible Tenant Service Income will not qualify as "rents from
real property." A REIT's Impermissible Tenant Service Income will not be less
than 150% of the REIT's direct cost in generating such income. To the extent
that services (other than those customarily furnished or rendered in connection
with the rental of real property) are rendered to the tenants of the property by
an independent contractor, the cost of the services must be borne by the
independent contractor. In this regard EOP has engaged a service corporation
owned by affiliates of the Equity Group Owners, which has been structured to
qualify as an independent contractor, to perform contract services that might
not be permissible for a REIT to perform directly.
 
                                       220
<PAGE>   229
 
     In any event, for all taxable years, the REIT may directly perform services
that are "usually or customarily rendered" in connection with the rental of
space for occupancy only and are not otherwise considered "rendered to the
occupant" of the property. EOP, through EOP Partnership, will provide certain
services to the EOP Properties. Based upon EOP's experience in the office rental
markets in which the EOP Properties are located, EOP believes that all services
provided to tenants by EOP are "usually or customarily rendered" in connection
with the rental of office space for occupancy, although there can be no
assurance that the IRS will not contend otherwise. Similarly, based on Beacon's
experience in the office rental markets in which the properties that EOP will
acquire from Beacon in the Merger are located, Beacon believes that all services
currently provided to tenants by Beacon (or any entity not an independent
contractor) are "usually or customarily rendered" in connection with the rental
of office space for occupancy and, hence, will not adversely affect EOP's
ability to qualify as a REIT if it continues to provide such services following
the Merger.
 
     EOP does not and will not (i) charge rent for any property that is based in
whole or in part on the income or profits of any person (except by reason of
being based on a percentage of receipts or sales, as described above, or unless
the EOP Board determines, in its discretion, that the rent received from a
particular tenant under such an arrangement is not material and will not
jeopardize EOP's status as a REIT), (ii) rent any property to a Related Party
Tenant (unless the EOP Board determines, in its discretion, that the rent
received from such Related Party Tenant is not material and will not jeopardize
EOP's status as a REIT), (iii) derive rental income attributable to personal
property (other than personal property leased in connection with the lease of
real property, the amount of which is less than 15% of the total rent received
under the lease), or (iv) perform services considered to be rendered to the
occupant of the property, other than through an independent contractor from whom
EOP derives no revenue (except to the extent that, commencing in 1998, the
Impermissible Tenant Service Income would not exceed the 1% threshold described
above or the EOP Board otherwise determines, in its discretion, that the
nonqualifying income resulting therefrom is not material and will not jeopardize
EOP's status as a REIT).
 
     EOP has requested a ruling from the IRS to the effect that if EOP
Partnership enters into arrangements with independent contractors to operate
parking facilities under which EOP Partnership will bear the expenses incurred
in operating the parking facilities, such an arrangement will not affect EOP's
ability to satisfy the 95% and 75% gross income tests. All but one of the
stand-alone garages held by EOP Partnership are operated by third-party Service
Companies under lease agreements whereby EOP Partnership and the Service Company
share the gross receipts from the parking operation or EOP Partnership receives
fixed rental payments from the Service Company and bears none of the operational
expenses. The income received by EOP Partnership from the stand-alone garages
under such agreements should qualify as "rents from real properties" for the
purpose of the 95% and 75% gross income tests. EOP Partnership will retain the
current arrangements with the Service Companies if it is unsuccessful in
obtaining a favorable ruling from the IRS. One stand-alone garage agreement
provides for the receipt of a percentage of net receipts by EOP Partnership and,
therefore, results in an insignificant amount of non-qualifying gross income
relative to the total gross income of the EOP. The income received under this
agreement should not affect EOP's ability to satisfy the 95% and 75% gross
income tests in future taxable years. Parking garages which are located within a
building, or are adjacent to, or are part of the same complex as, a building
generally are operated by Service Companies pursuant to parking management
agreements under which the Service Companies receive a management fee which may
be a fixed dollar amount, or a percentage of gross or net revenues. EOP believes
that the income received pursuant to such agreements should qualify as "rents
from real property" for the purposes of the 95% and 75% gross income tests. In
this regard, Beacon has recently obtained a ruling from the IRS to this effect,
and EOP has been advised informally by the IRS that its request for a ruling to
this effect will be granted.
 
     "Interest" generally will not qualify under the 75% or 95% gross income
tests if it depends in whole or in part on the income or profits of any person.
However, interest will not fail to so qualify solely by reason of being based on
a fixed percentage or percentages of receipts or sales. EOP does not expect to
derive significant amounts of interest that will not qualify under the 75% and
95% gross income tests. In this regard, Beacon currently holds, through Beacon
Management Company and Beacon Construction Company, options to acquire a loan
with respect to the Rowes Wharf property. Such loans provide for payments of
interest based
 
                                       221
<PAGE>   230
 
upon cash flow. These loans, which could not be held directly by Beacon or EOP
without jeopardizing their qualification as a REIT, will continue to be held in
a taxable "C" corporation following the Merger.
 
     As discussed above in "EOP and "Beacon," EOP Management Corp. and Beacon
Management Company conduct third-party management services with respect to
properties not wholly owned by EOP Partnership or Beacon Partnership, as
applicable, and the Beacon Design Company provides interior space design
services with respect to properties that are not wholly-owned by Beacon. EOP
Partnership will own 100% of the non-voting stock of each of the Third-Party
Service Corporations but none of the voting stock of any of the Third-Party
Service Corporations. Each of the Third-Party Service Corporations is taxable as
a regular "C" corporation. EOP's share of any dividends received from the
Third-Party Service Corporations should qualify for the purposes of the 95%
gross income test, but not for purposes of the 75% gross income test. EOP does
not anticipate that it will receive sufficient dividends from the Third-Party
Service Corporations to cause it to exceed the limit on non-qualifying income
under the 75% gross income test.
 
     If EOP fails to satisfy one or both of the 75% or 95% gross income tests
for any taxable year, it may nevertheless qualify as a REIT for such year if it
is entitled to relief under certain provisions of the Code. These relief
provisions will be generally available if (i) EOP's failure to meet such tests
is due to reasonable cause and not due to willful neglect and (ii) EOP attaches
a schedule of the sources of its income to its federal income tax return and any
incorrect information on such schedule is not due to fraud with intent to evade
tax. It is not possible, however, to state whether in all circumstances EOP
would be entitled to the benefit of these relief provisions. For example, if EOP
fails to satisfy the gross income tests because non-qualifying income that EOP
intentionally incurs exceeds the limits on such income, the IRS could conclude
that EOP's failure to satisfy the tests was not due to reasonable cause. If
these relief provisions are inapplicable to a particular set of circumstances
involving EOP, EOP will fail to qualify as a REIT. As discussed above in
"-- Taxation of EOP as a REIT -- General," even if these relief provisions
apply, a tax would be imposed with respect to the excess net income. No similar
relief provision is available if EOP fails the 30% income test for its taxable
year ending December 31, 1997. If the 30% gross income test is not met for such
taxable year, EOP will fail to qualify as a REIT.
 
     Any gain realized by EOP on the sale of any property held as inventory or
other property held primarily for sale to customers in the ordinary course of
business (including EOP's share of any such gain realized by EOP Partnership)
will be treated as income from a "prohibited transaction" that is subject to a
100% penalty tax. Such prohibited transaction income may also have an adverse
effect upon EOP's ability to satisfy the income tests for qualification as a
REIT. Under existing law, whether property is held as inventory or primarily for
sale to customers in the ordinary course of a trade or business is a question of
fact that depends on all the facts and circumstances with respect to the
particular transaction. EOP Partnership intends to hold the Properties
(including those properties acquired in the Merger) for investment with a view
to long-term appreciation, to engage in the business of acquiring, developing,
owning, and operating the Properties (and other properties) and to make such
occasional sales of the Properties as are consistent with EOP Partnership's
investment objectives. There can be no assurance, however, that the IRS might
not contend that one or more of such sales is subject to the 100% penalty tax.
 
     ASSET TESTS APPLICABLE TO REITS.  EOP, at the close of each quarter of its
taxable year, must also satisfy three tests relating to the nature of its
assets. First, at least 75% of the value of EOP's total assets must be
represented by real estate assets including (i) its allocable share of real
estate assets (including stock of a REIT) held by partnerships in which EOP owns
an interest (including its allocable share of the assets held directly or
indirectly through EOP Partnership) and (ii) stock or debt instruments held for
not more than one year purchased with the proceeds of a stock offering or
long-term (at least five years) debt offering of EOP, cash, cash items and
government securities. Second, not more than 25% of EOP's total assets may be
represented by securities other than those in the 75% asset class. Third, of the
investments included in the 25% asset class, the value of any one issuer's
securities owned by EOP may not exceed 5% of the value of EOP's total assets,
and EOP may not own more than 10% of any one issuer's outstanding voting
securities.
 
     EOP Partnership will not own any of the voting stock of any of the
Third-Party Service Corporations but it will own 100% of the non-voting stock of
each of the Third-Party Service Corporations. EOP Partnership
 
                                       222
<PAGE>   231
 
also may own nonvoting stock, representing substantially all of the equity, in
other corporate entities that serve as partners or members in the various
titleholding entities. EOP has represented, however, that EOP Partnership does
not and will not own more than 10% of the voting securities of any entity that
would be treated as a corporation for federal income tax purposes (other than
stock of REITs, which are not taken into account for purposes of this
limitation). In addition, EOP and its senior management believe, and EOP will
represent, that EOP's pro rata share of the value of the securities of the
Third-Party Service Corporations does not exceed 5% of the total value of EOP's
assets. There can be no assurance, however, that the IRS might not contend
either that the value of the securities of the Third-Party Service Corporations
held by EOP (through the ZML Opportunity Partnerships and EOP Partnership)
exceeds the 5% value limitation or that nonvoting stock of the Third-Party
Service Corporations or another corporate entity owned by EOP Partnership should
be considered "voting stock" for this purpose.
 
     After initially meeting the asset tests at the close of any quarter, EOP
will not lose its status as a REIT for failure to satisfy the asset tests at the
end of a later quarter solely by reason of changes in asset values. If the
failure to satisfy the asset tests results from an acquisition of securities or
other property during a quarter (including, for example, as a result of EOP
increasing its interest in EOP Partnership as a result of the Merger, the
exercise of a Unit Redemption Right or an additional capital contribution of
proceeds of an offering of EOP Common Shares by EOP), the failure can be cured
by disposition of sufficient nonqualifying assets within 30 days after the close
of that quarter. EOP intends to maintain adequate records of the value of its
assets to ensure compliance with the asset tests and to take such other actions
within 30 days after the close of any quarter as may be required to cure any
noncompliance. If EOP fails to cure noncompliance with the asset tests within
such time period, EOP would cease to qualify as a REIT.
 
     ANNUAL DISTRIBUTION REQUIREMENTS APPLICABLE TO REITS.  EOP, in order to
qualify as a REIT, is required to distribute dividends (other than capital gain
dividends) to its shareholders in an amount at least equal to (i) the sum of (a)
95% of EOP's "REIT taxable income" (computed without regard to the dividends
paid deduction and EOP's net capital gain) and (b) 95% of the net income (after
tax), if any, from foreclosure property, minus (ii) the sum of certain items of
noncash income. In addition, if EOP disposes of any Built-In Gain Asset during
its Recognition Period, EOP will be required, pursuant to Treasury Regulations
which have not yet been promulgated, to distribute at least 95% of the Built-In
Gain (after tax), if any, recognized on the disposition of such asset. Such
distributions must be paid in the taxable year to which they relate, or in the
following taxable year if declared before EOP timely files its tax return for
such year and if paid on or before the first regular dividend payment date after
such declaration.
 
     To the extent that EOP does not distribute all of its net capital gain or
distributes at least 95%, but less than 100%, of its "REIT taxable income," as
adjusted, it will be subject to tax thereon at regular ordinary and capital gain
corporate tax rates. Pursuant to the 1997 Act, for EOP's taxable years
commencing on or after January 1, 1998, EOP may elect to require the EOP
Shareholders to include EOP's undistributed net capital gains in their income by
designating, in a written notice to EOP Shareholders, those amounts as
undistributed capital gains in respect of its shareholders' shares. If EOP makes
such an election, the EOP Shareholders will (i) include in their income as
capital gains their proportionate share of such undistributed capital gains and
(ii) be deemed to have paid their proportionate share of the tax paid by EOP on
such undistributed capital gains and thereby receive a credit or refund for such
amount. An EOP Shareholder will increase the basis in its EOP Common Shares by
the difference between the amount of capital gain included in its income and the
amount of the tax that EOP is deemed to have paid on the EOP Shareholder's
behalf. The earnings and profits of EOP will be adjusted appropriately. For a
more detailed description of the tax consequences to an EOP Shareholder of such
a designation, see "-- Taxation of Taxable U.S. Shareholders of EOP Generally."
 
     In addition, if EOP should fail to distribute during each calendar year at
least the sum of (i) 85% of its REIT ordinary income for such year, (ii) 95% of
its REIT capital gain income for such year, and (iii) any undistributed taxable
income from prior periods, EOP would be subject to a 4% excise tax on the excess
of such required distribution over the sum of amounts actually distributed
during the calendar year by the REIT and the amount, if any, on which the REIT
paid income tax for such year.
 
                                       223
<PAGE>   232
 
     EOP intends to make timely distributions sufficient to satisfy its annual
distribution requirements. In this regard, the EOP Partnership Agreement
authorizes EOP, as managing general partner, to take such steps as may be
necessary to cause EOP Partnership to distribute to its partners an amount
sufficient to permit EOP to meet these distribution requirements. It is expected
that EOP's REIT taxable income will be less than its cash flow due to the
allowance of depreciation and other noncash charges in computing REIT taxable
income. Accordingly, EOP anticipates that it will generally have sufficient cash
or liquid assets to enable it to satisfy the distribution requirements described
above. It is possible, however, that EOP, from time to time, may not have
sufficient cash or other liquid assets to meet these distribution requirements
due to timing differences between (i) the actual receipt of income and actual
payment of deductible expenses and (ii) the inclusion of such income and
deduction of such expenses in arriving at taxable income of EOP. If such timing
differences occur, in order to meet the distribution requirements, EOP may find
it necessary to arrange for short-term, or possibly long-term, borrowings or to
pay dividends in the form of taxable stock dividends.
 
     Under certain circumstances, EOP may be able to rectify a failure to meet
the distribution requirement for a year by paying "deficiency dividends" to EOP
Shareholders in a later year, which may be included in EOP's deduction for
dividends paid for the earlier year. Thus, EOP may be able to avoid being taxed
on amounts distributed as deficiency dividends; however, EOP will be required to
pay interest based upon the amount of any deduction taken for deficiency
dividends.
 
     RECORDKEEPING REQUIREMENTS.  Pursuant to applicable Treasury Regulations,
EOP must comply with certain recordkeeping requirements in order to qualify for
taxation as a REIT.
 
     FAILURE OF EOP TO QUALIFY AS A REIT.  If EOP fails to qualify for taxation
as a REIT in any taxable year, and if the relief provisions do not apply, EOP
will be subject to tax (including any applicable alternative minimum tax) on its
taxable income at regular corporate rates. Distributions to EOP Shareholders in
any year in which EOP fails to qualify will not be deductible by EOP nor will
they be required to be made. As a result, EOP's failure to qualify as a REIT
would significantly reduce the cash available for distribution by EOP to its EOP
Shareholders. In addition, if EOP fails to qualify as a REIT, all distributions
to EOP Shareholders will be taxable as ordinary income, to the extent of EOP's
current and accumulated earnings and profits, and, subject to certain
limitations of the Code, corporate distributees may be eligible for the
dividends received deduction. Unless entitled to relief under specific statutory
provisions, EOP also will be disqualified from taxation as a REIT for the four
taxable years following the year during which qualification was lost. It is not
possible to state whether in all circumstances EOP would be entitled to such
statutory relief.
 
TAXATION OF TAXABLE U.S. SHAREHOLDERS OF EOP GENERALLY
 
     As used herein, the term "U.S. Shareholder" means a holder of EOP Common
Shares who (for United States federal income tax purposes) (i) is a citizen or
resident of the United States, (ii) is a corporation, partnership, or other
entity created or organized in or under the laws of the United States or of any
political subdivision thereof, (iii) is an estate or trust the income of which
is subject to United States federal income taxation regardless of its source or
(iv) a trust whose administration is subject to the primary supervision of a
United States court and which has one or more United States persons who have the
authority to control all substantial decisions of the trust.
 
     DISTRIBUTIONS BY EOP.  As long as EOP qualifies as a REIT, distributions
made by EOP out of its current or accumulated earnings and profits (and not
designated as capital gain dividends) will constitute dividends taxable to its
taxable U.S. Shareholders as ordinary income. Such distributions will not be
eligible for the dividends received deduction in the case of U.S. Shareholders
that are corporations. To the extent that EOP makes distributions (not
designated as capital gain dividends) in excess of its current and accumulated
earnings and profits, such distributions will be treated first as a tax-free
return of capital to each U.S. Shareholder, reducing the adjusted basis which
such U.S. Shareholder has in its EOP Common Shares for tax purposes by the
amount of such distribution (but not below zero), with distributions in excess
of a U.S. Shareholder's adjusted basis in its EOP Common Shares taxable as
capital gains (provided that the EOP Common Shares have been held as a capital
asset). Dividends declared by EOP in October, November, or December of any year
and payable to an EOP Shareholder of record on a specified date in any such
month
 
                                       224
<PAGE>   233
 
shall be treated as both paid by EOP and received by the EOP Shareholder on
December 31 of such year, provided that the dividend is actually paid by EOP on
or before January 31 of the following calendar year.
 
     Distributions made by EOP with respect to taxable years beginning on or
after January 1, 1998, that are properly designated by EOP as capital gain
dividends will be taxable to taxable U.S. Shareholders, who are individuals,
estates or trusts, as gain from the sale or exchange of a capital asset held for
more than one year (to the extent that they do not exceed EOP's actual net
capital gain for the taxable year) without regard to the period for which a U.S.
Shareholder has held his EOP Common Shares.
 
     On November 10, 1997, the IRS issued IRS Notice 97-64, which provides
generally that EOP may classify portions of its designated capital gain dividend
as (i) a 20% rate gain distribution (which would be taxed as long-term capital
gain in the 20% group), (ii) an unrecaptured Section 1250 gain distribution
(which would be taxed as long-term capital gain in the 25% group), or (iii) a
28% rate gain distribution (which would be taxed as long-term capital gain in
the 28% group). (If no designation is made, the entire designated capital gain
dividend will be treated as a 28% rate gain distribution. For a discussion of
the 20%, 25% and 28% tax rates applicable to individuals, see "1997 Act Changes
to Capital Gain Taxation" below.) IRS Notice 97-64 provides that a REIT must
determine the maximum amounts that it may designate as 20% and 25% rate capital
gain dividends by performing the computation required by the Code as if the REIT
were an individual whose ordinary income were subject to a marginal tax rate of
at least 28%. The Notice further provides that designations made by the REIT
only will be effective to the extent that they comply with Revenue Ruling 89-91,
which requires that distributions made to different classes of shares be
composed proportionately of dividends of a particular type.
 
     Distributions that are properly designated by EOP as capital gain dividends
will be taxable to taxable corporate U.S. Shareholders as long-term capital gain
(to the extent that capital gains dividends do not exceed EOP's actual net
capital gain for the taxable year) without regard to the period for which such
corporate U.S. Shareholder has held his EOP Common Shares. Such corporate U.S.
Shareholders may, however, be required to treat up to 20% of certain capital
gain dividends as ordinary income.
 
     U.S. Shareholders may not include in their individual income tax returns
any net operating losses or capital losses of EOP. Instead, such losses would be
carried over by EOP for potential offset against future income (subject to
certain limitations). Distributions made by EOP and gain arising from the sale
or exchange by a U.S. Shareholder of EOP Common Shares will not be treated as
passive activity income, and, as a result, U.S. Shareholders generally will not
be able to apply any "passive losses" against such income or gain. In addition,
taxable distributions from EOP generally will be treated as investment income
for purposes of the investment interest limitations. Capital gain dividends and
capital gains from the disposition of EOP Common Shares (including distributions
treated as such), however, will be treated as investment income only if the U.S.
Shareholder so elects, in which case such capital gains will be taxed at
ordinary income rates. EOP will notify EOP Shareholders after the close of EOP's
taxable year as to the portions distributions attributable to that year that
constitute ordinary income, return of capital and capital gain.
 
     Pursuant to the 1997 Act, for taxable years beginning on or after January
1, 1998, a EOP may designate (by written notice to EOP Shareholders) its
retained net capital gain (i.e., net capital gain that is not actually
distributed as capital gain dividends, as described above) as undistributed
capital gains in respect of EOP Shareholders' shares. Pursuant to such a
designation by EOP with respect to retained net capital gains, a U.S.
Shareholder would include its proportionate share of such gain in income as
capital gain, and would be treated as having paid its proportionate share of the
tax paid by the REIT with respect to the gain. The U.S. Shareholder's basis in
its shares would be increased by its share of such gain and decreased by its
share of such tax. With respect to such capital gain of a U.S. Shareholder that
is an individual or an estate or trust, the IRS, as described above in this
section, has authority to issue regulations that could apply the special tax
rate applicable generally to the portion of the long-term capital gains of an
individual or an estate or trust attributable to deductions for depreciation
taken with respect to depreciable real property.
 
     SALES OF EOP COMMON SHARES.  Upon any sale or other disposition of EOP
Common Shares, a U.S. Shareholder will recognize gain or loss for federal income
tax purposes in an amount equal to the difference between (i) the amount of cash
and the fair market value of any property received on such sale or other
 
                                       225
<PAGE>   234
 
disposition and (ii) the holder's adjusted basis in such EOP Common Shares for
tax purposes. In the case of a U.S. Shareholder who is an individual or an
estate or trust, such gain or loss will be mid-term capital gain or loss if such
shares have been held for more than one year but not more than 18 months, and
long-term capital gain or loss if such shares have been held for more than 18
months. In the case of a U.S. Shareholder that is a corporation, such gain or
loss will be long-term capital gain or loss if such shares have been held for
more than one year. In general, any loss recognized by an U.S. Shareholder upon
the sale or other disposition of EOP Common Shares that have been held for six
months or less (after applying certain holding period rules) will be treated as
either a long-term or a mid-term capital loss, to the extent of distributions
received by such U.S. Shareholder from EOP which were required to be treated as
long-term or mid-term capital gains.
 
     1997 ACT CHANGES TO CAPITAL GAIN TAXATION.  The 1997 Act alters the
taxation of capital gain income. Under the 1997 Act, individuals, trusts and
estates that hold certain investments for more than 18 months may be taxed at a
maximum long-term capital gain rate of 20% on the sale or exchange of those
investments. Individuals, trusts and estates that hold certain assets for more
than one year but not more than 18 months may be taxed at a maximum mid-term
capital gain rate of 28% on the sale or exchange of those investments. The 1997
Act also provides a maximum rate of 25% for "unrecaptured section 1250 gain" for
individuals, trusts and estates, special rules for "qualified 5-year gain," and
other changes to prior law. The 1997 Act allows the IRS to prescribe regulations
on how the 1997 Act's new capital gain rates will apply to sales of capital
assets by "pass-through entities," which include REITs, such as EOP, and to
sales of interests in "pass-through entities." To date, such regulations have
not been prescribed. For a discussion of new rules under the 1997 Act that apply
to the taxation of distributions by EOP to its shareholders that are designated
by EOP as "capital gain dividends," see "Distributions by EOP" above.
Unitholders are urged to consult with their own tax advisors with respect to the
new rules contained in the 1997 Act.
 
BACKUP WITHHOLDING FOR EOP DISTRIBUTIONS
 
     EOP will report to its U.S. Shareholders and the IRS the amount of
dividends paid during each calendar year, and the amount of tax withheld, if
any. Under the backup withholding rules, a shareholder may be subject to backup
withholding at the rate of 31% with respect to dividends paid unless such holder
(a) is a corporation or comes within certain other exempt categories and, when
required, demonstrates this fact, or (b) provides a taxpayer identification
number, certifies as to no loss of exemption from backup withholding, and
otherwise complies with applicable requirements of the backup withholding rules.
A U.S. shareholder that does not provide EOP with his correct taxpayer
identification number may also be subject to penalties imposed by the IRS. Any
amount paid as backup withholding will be creditable against the shareholder's
income tax liability. In addition, EOP may be required to withhold a portion of
capital gain distributions to any EOP Shareholders who fail to certify their
non-foreign status to EOP. See "-- Taxation of Non-U.S. Shareholders of EOP."
 
TAXATION OF TAX-EXEMPT SHAREHOLDERS OF EOP
 
     The IRS has ruled that amounts distributed as dividends by a qualified REIT
do not constitute unrelated business taxable income ("UBTI") when received by a
tax-exempt entity. Based on that ruling, provided that a tax-exempt shareholder
(except certain tax-exempt shareholders described below) has not held its EOP
Common Shares as "debt financed property" within the meaning of the Code and
such EOP Common Shares are not otherwise used in a trade or business, the
dividend income from EOP will not be UBTI to a tax-exempt shareholder.
Similarly, income from the sale of EOP Common Shares will not constitute UBTI
unless such tax-exempt shareholder has held such EOP Common Shares as "debt
financed property" within the meaning of the Code or has used the EOP Common
Shares in a trade or business.
 
     For tax-exempt shareholders that are social clubs, voluntary employee
benefit associations, supplemental unemployment benefit trusts, and qualified
group legal services plans exempt from federal income taxation under Code
Sections 501 (c)(7), (c)(9), (c)(17) and (c)(20), respectively, income from an
investment in EOP will constitute UBTI unless the organization is able to
properly deduct amounts set aside or placed in reserve for certain purposes so
as to offset the income generated by its investment in EOP. Such prospective
shareholders should consult their own tax advisors concerning these "set aside"
and reserve requirements.
 
                                       226
<PAGE>   235
 
     Notwithstanding the above, however, the Code provides that a portion of the
dividends paid by a "pension held REIT" shall be treated as UBTI as to any trust
which (i) is described in Section 401(a) of the Code, (ii) is tax-exempt under
Section 501(a) of the Code, and (iii) holds more than 10% (by value) of the
interests in the REIT. Tax-exempt pension funds that are described in Section
401(a) of the Code are referred to below as "qualified trusts."
 
     A REIT is a "pension held REIT" if (i) it would not have qualified as a
REIT but for the fact that Section 856(h)(3) of the Code provides that stock
owned by qualified trusts shall be treated, for purposes of the "not closely
held" requirement, as owned by the beneficiaries of the trust (rather than by
the trust itself), and (ii) either (a) at least one such qualified trust holds
more than 25% (by value) of the interests in the REIT, or (b) one or more such
qualified trusts, each of which owns more than 10% (by value) of the interests
in the REIT, hold in the aggregate more than 50% (by value) of the interests in
the REIT. The percentage of any REIT dividend treated as UBTI is equal to the
ratio of (i) the UBTI earned by the REIT (treating the REIT as if it were a
qualified trust and therefore subject to tax on UBTI) to (ii) the total gross
income of the REIT. A de minimis exception applies where the percentage is less
than 5% for any year. The provisions requiring qualified trusts to treat a
portion of REIT distributions as UBTI will not apply if the REIT is able to
satisfy the "not closely held" requirement without relying upon the
"look-through" exception with respect to qualified trusts. Based on both the
current ownership of EOP Common Shares and the anticipated ownership of EOP
Common Shares immediately following the Merger, and as a result of certain
limitations on transfer and ownership of EOP Common Shares contained in the
Declaration of Trust, EOP does not expect to be classified as a "pension held
REIT."
 
TAXATION OF NON-U.S. SHAREHOLDERS OF EOP
 
     The rules governing United States federal income taxation of the ownership
and disposition of EOP Common Shares by persons that are, for purposes of such
taxation, nonresident alien individuals, foreign corporations, foreign
partnerships or foreign estates or trusts (collectively, "Non-U.S.
Shareholders") are complex, and no attempt is made herein to provide more than a
brief summary of such rules. Accordingly, the discussion does not address all
aspects of United States federal income tax and does not address state, local or
foreign tax consequences that may be relevant to a Non-U.S. Shareholder in light
of its particular circumstances. In addition, this discussion is based on
current law, which is subject to change, and assumes that EOP qualifies for
taxation as a REIT. Prospective Non-U.S. Shareholders should consult with their
own tax advisers to determine the impact of federal, state, local and foreign
income tax laws with regard to an investment in EOP Common Shares, including any
reporting requirements.
 
     DISTRIBUTIONS BY EOP.  Distributions by EOP to a Non-U.S. Shareholder that
are neither attributable to gain from sales or exchanges by EOP of United States
real property interests nor designated by EOP as capital gains dividends will be
treated as dividends of ordinary income to the extent that they are made out of
current or accumulated earnings and profits of EOP. Such distributions
ordinarily will be subject to withholding of United States federal income tax on
a gross basis (that is, without allowance of deductions) at a 30% rate or such
lower rate as may be specified by an applicable income tax treaty, unless the
dividends are treated as effectively connected with the conduct by the Non-U.S.
Shareholder of a United States trade or business. Dividends that are effectively
connected with such a trade or business will be subject to tax on a net basis
(that is, after allowance of deductions) at graduated rates, in the same manner
as domestic shareholders are taxed with respect to such dividends, and are
generally not subject to withholding. Any such dividends received by a Non-U.S.
Shareholder that is a corporation may also be subject to an additional branch
profits tax at a 30% rate or such lower rate as may be specified by an
applicable income tax treaty. EOP expects to withhold United States income tax
at the rate of 30% on the gross amount of any such distributions made to a
Non-U.S. Shareholder unless (i) a lower treaty rate applies and any required
form or certification evidencing eligibility for that reduced rate is filed with
EOP or (ii) the Non-U.S. Shareholder files an IRS Form 4224 with EOP claiming
that the distribution is effectively connected income.
 
     Distributions in excess of current or accumulated earnings and profits of
EOP will not be taxable to a Non-U.S. Shareholder to the extent that they do not
exceed the adjusted basis of the shareholder's EOP Common Shares, but rather
will reduce the adjusted basis of such EOP Common Shares. To the extent that
 
                                       227
<PAGE>   236
 
such distributions exceed the adjusted basis of a Non-U.S. Shareholder's EOP
Common Shares, they will give rise to gain from the sale or exchange of its EOP
Common Shares, the tax treatment of which is described below. As a result of a
legislative change made by the Small Business Job Protection Act of 1996, it
appears that EOP will be required to withhold 10% of any distribution in excess
of EOP's current and accumulated earnings and profits. Consequently, although
EOP intends to withhold at a rate of 30% on the entire amount of any
distribution (or a lower applicable treaty rate), to the extent that EOP does
not do so, any portion of a distribution not subject to withholding at a rate of
30% (or a lower applicable treaty rate) will be subject to withholding at a rate
of 10%. However, the Non-U.S. Shareholder may seek a refund of such amounts from
the IRS if it subsequently determined that such distribution was, in fact, in
excess of current or accumulated earnings and profits of EOP, and the amount
withheld exceeded the Non-U.S. Shareholder's United States tax liability, if
any, with respect to the distribution.
 
     Distributions to a Non-U.S. Shareholder that are designated by EOP at the
time of distribution as capital gains dividends (other than those arising from
the disposition of a United States real property interest) generally will not be
subject to United States federal income taxation, unless (i) the investment in
the EOP Common Shares is effectively connected with the Non-U.S. Shareholder's
United States trade or business, in which case the Non-U.S. Shareholder will be
subject to the same treatment as domestic shareholders with respect to such gain
(except that a shareholder that is a foreign corporation may also be subject to
the 30% branch profits tax, as discussed above), or (ii) the Non-U.S.
Shareholder is a nonresident alien individual who is present in the United
States for 183 days or more during the taxable year and has a "tax home" in the
United States, in which case the nonresident alien individual will be subject to
a 30% tax on the individual's capital gains.
 
     Under the Foreign Investment in Real Property Tax Act ("FIRPTA"),
distributions to a Non-U.S. Shareholder that are attributable to gain from sales
or exchanges by EOP of United States real property interests (whether or not
designated as a capital gain dividend) will cause the Non-U.S. Shareholder to be
treated as recognizing such gain as income effectively connected with a United
States trade or business. Non-U.S. Shareholders would thus generally be taxed at
the same rates applicable to domestic shareholders (subject to a special
alternative minimum tax in the case of nonresident alien individuals). Also,
such gain may be subject to a 30% branch profits tax in the hands of a Non-U.S.
Shareholder that is a corporation, as discussed above. EOP is required to
withhold 35% of any such distribution. That amount is creditable against the
Non-U.S. Shareholder's United States federal income tax liability.
 
     Although the law is not entirely clear on the matter, it appears that
amounts designated by EOP pursuant to the 1997 Act as undistributed capital
gains in respect of EOP Shareholders' shares (see "-- Annual Distribution
Requirements Applicable to REITs" above) would be treated with respect to
Non-U.S. Shareholders in the manner outlined in the preceding two paragraphs for
actual distributions by EOP of capital gain dividends. Under that approach, the
Non-U.S. Shareholders would be able to offset as a credit against their United
States federal income tax liability resulting therefrom their proportionate
share of the tax paid by EOP on such undistributed capital gains (and to receive
from the IRS a refund to the extent their proportionate share of such tax paid
by EOP were to exceed their actual United States federal income tax liability).
 
     SALE OF COMMON SHARES.  Gain recognized by a Non-U.S. Shareholder upon the
sale or exchange of EOP Common Shares generally will not be subject to United
States taxation unless such shares constitute a "United States real property
interest" within the meaning of FIRPTA. The EOP Common Shares will not
constitute a "United States real property interest" so long as EOP is a
"domestically controlled REIT." A "domestically controlled REIT" is a REIT in
which at all times during a specified testing period less than 50% in value of
its stock is held directly or indirectly by Non-U.S. Shareholders.
Notwithstanding the foregoing, gain from the sale or exchange of EOP Common
Shares not otherwise subject to FIRPTA will be taxable to a Non-U.S. Shareholder
if the Non-U.S. Shareholder is a nonresident alien individual who is present in
the United States for 183 days or more during the taxable year and has a "tax
home" in the United States. In such case, the nonresident alien individual will
be subject to a 30% United States withholding tax on the amount of such
individual's gain.
 
                                       228
<PAGE>   237
 
     EOP believes that after the Merger, it will continue to be a "domestically
controlled REIT," and therefore that the sale of Common Shares will not be
subject to taxation under FIRPTA. However, because the EOP Common Shares are
publicly traded, no assurance can be given that EOP will continue to be a
"domestically-controlled REIT." If EOP fails to qualify as a
"domestically-controlled REIT," gain arising from the sale or exchange by a
Non-U.S. Shareholder of EOP Common Shares still would not be subject to United
States taxation under FIRPTA as a sale of a "United States real property
interest," provided that (i) the EOP Common Shares are "regularly traded" (as
defined by applicable Treasury Regulations) on an established securities market
(e.g., the New York Stock Exchange) and (ii) the selling Non-U.S. Shareholder
held 5% or less of the value of the outstanding EOP Common Shares at all times
during a specified testing period. If gain on the sale or exchange of EOP Common
Shares were subject to taxation under FIRPTA, the Non-U.S. Shareholder would be
subject to regular United States income tax with respect to such gain in the
same manner as a U.S. Shareholder (subject to any applicable alternative minimum
tax, a special alternative minimum tax in the case of nonresident alien
individuals and the possible application of the 30% branch profits tax in the
case of foreign corporations), and the purchaser of the EOP Common Shares would
be required to withhold and remit to the IRS 10% of the purchase price.
 
     BACKUP WITHHOLDING TAX AND INFORMATION REPORTING.  Backup withholding tax
(which generally is a withholding tax imposed at the rate of 31% on certain
payments to persons that fail to furnish certain information under the United
States information reporting requirements) and information reporting will
generally not apply to distributions paid to Non-U.S. Shareholders outside the
United States that are treated as (i) dividends subject to the 30% (or lower
treaty rate) withholding tax discussed above, (ii) capital gains dividends or
(iii) distributions attributable to gain from the sale or exchange by EOP of
United States real property interests. As a general matter, backup withholding
and information reporting will not apply to a payment of the proceeds of a sale
of EOP Common Shares by or through a foreign office of a foreign broker.
Information reporting (but not backup withholding) will apply, however, to a
payment of the proceeds of a sale of EOP Common Shares by a foreign office of a
broker that (a) is a United States person, (b) derives 50% or more of its gross
income for certain periods from the conduct of a trade or business in the United
States or (c) is a "controlled foreign corporation" (generally, a foreign
corporation controlled by United States shareholders) for United States tax
purposes, unless the broker has documentary evidence in its records that the
holder is a Non-U.S. Shareholder and certain other conditions are met, or the
shareholder otherwise establishes an exemption. Payment to or through a United
States office of a broker of the proceeds of a sale of EOP Common Shares is
subject to both backup withholding and information reporting unless the
shareholder certifies under penalty of perjury that the shareholder is a
Non-U.S. Shareholder, or otherwise establishes an exemption. A Non-U.S.
Shareholder may obtain a refund of any amounts withheld under the backup
withholding rules by filing the appropriate claim for refund with the IRS.
 
     The United States Treasury has recently finalized regulations regarding the
withholding and information reporting rules discussed above. In general, these
regulations do not alter the substantive withholding and information reporting
requirements but unify certification procedures and forms and clarify and modify
reliance standards. These regulations generally are effective for payments made
after December 31, 1998, subject to certain transition rules. Valid withholding
certificates that are held on December 31, 1998, will remain valid until the
earlier of December 31, 1999 or the date of expiration of the certificate under
rules currently in effect (unless otherwise invalidated due to changes in the
circumstances of the person whose name is on such certificate). A Non-U.S.
Shareholder should consult its own advisor regarding the effect of the new
Treasury Regulations.
 
TAX ASPECTS OF EOP'S OWNERSHIP OF INTERESTS IN THE ZML OPPORTUNITY PARTNERSHIPS
AND EOP PARTNERSHIP
 
     GENERAL.  Substantially all of EOP's investments are held indirectly
through the ZML Opportunity Partnerships and EOP Partnership. In general,
partnerships are "pass-through" entities which are not subject to federal income
tax. Rather, partners are allocated their proportionate shares of the items of
income, gain, loss, deduction and credit of a partnership, and are potentially
subject to tax thereon, without regard to whether the partners receive a
distribution from the partnership. EOP will include in its income its
proportionate share of the foregoing partnership items for purposes of the
various REIT income tests and in
 
                                       229
<PAGE>   238
 
the computation of its REIT taxable income. Moreover, for purposes of the REIT
asset tests, EOP will include its proportionate share of assets held through the
ZML Opportunity Partnerships and EOP Partnership. See "-- Requirements for
Qualification as a REIT -- Ownership of Partnership Interests by a REIT."
 
     ENTITY CLASSIFICATION.  If any of the ZML Opportunity Partnerships or EOP
Partnership were treated as an association, the entity would be taxable as a
corporation and therefore would be subject to an entity level tax on its income.
In such a situation, the character of EOP's assets and items of gross income
would change and would preclude EOP from qualifying as a REIT (see
"-- Requirements for Qualification as a REIT -- Asset Tests Applicable to REITs"
and "-- Income Tests Applicable to REITs"). The same result could occur if any
subsidiary partnership or LLC failed to qualify for treatment as a partnership.
 
     Prior to January 1, 1997, an organization formed as a partnership or a
limited liability company was treated as a partnership for federal income tax
purposes rather than as a corporation only if it had no more than two of the
four corporate characteristics that the Treasury Regulations in effect at that
time used to distinguish a partnership from a corporation for tax purposes.
These four characteristics were (i) continuity of life, (ii) centralization of
management, (iii) limited liability and (iv) free transferability of interests.
Under final Treasury Regulations which became effective January 1, 1997, the
four factor test has been eliminated and an entity formed as a partnership or as
a limited liability company will be taxed as a partnership for federal income
tax purposes, unless it specifically elects otherwise. The Treasury Regulations
provide that the IRS will not challenge the classification of an existing
partnership or limited liability company for tax periods prior to January 1,
1997, so long as (1) the entity had a reasonable basis for its claimed
classification, (2) the entity and all its members recognized the federal income
tax consequences of any changes in the entity's classification within the 60
months prior to January 1, 1997, and (3) neither the entity nor any member of
the entity had been notified in writing on or before May 8, 1996, that the
classification of the entity was under examination by the IRS.
 
     Hogan & Hartson, special tax counsel to EOP, is of the opinion, based upon
certain factual assumptions and representations described in the opinion, that
each of the ZML Opportunity Partnerships and EOP Partnership will be treated as
a partnership for federal income tax purposes (and not as an association taxable
as a corporation).
 
OTHER TAX CONSEQUENCES FOR EOP, ITS SHAREHOLDERS AND THE THIRD-PARTY SERVICE
CORPORATIONS
 
     EOP and its shareholders may be subject to state or local taxation in
various state or local jurisdictions, including those in which it or they
transact business or reside. The state and local tax treatment of EOP and its
shareholders may not conform to the federal income tax consequences discussed
above. Consequently, prospective shareholders should consult their own tax
advisors regarding the effect of state and local tax laws on an investment in
EOP.
 
     A portion of the cash to be used by EOP to fund distributions is expected
to come from the Third-Party Service Corporations through payments of dividends
on the shares of the Third-Party Service Corporations held by EOP Partnership.
The Third-Party Service Corporations pay federal and state income tax at the
full applicable corporate rates. To the extent that the Third-Party Service
Corporations are required to pay federal, state or local taxes, the cash
otherwise available for distribution by EOP to EOP Shareholders will be reduced
accordingly.
 
                              ERISA CONSIDERATIONS
 
STATUS OF EOP AND EOP PARTNERSHIP UNDER ERISA
 
     The following section discusses certain principles that apply in
determining whether the fiduciary requirements of ERISA and the prohibited
transaction provisions of ERISA and the Code apply to an entity because one or
more investors in the entity's equity interests is an ERISA Plan, or is an IRA
or a qualified pension, profit sharing or stock bonus plan, or other type of
plan that is not subject to ERISA but is defined as
 
                                       230
<PAGE>   239
 
a "Plan" under section 4975(e)(I) of the Code and is subject to the rules of
section 4975 of the Code ("Other Plans").
 
     If the underlying assets of EOP are deemed to be assets of an investing
ERISA Plan ("Plan Assets"), (i) the prudence standards and other provisions of
Part 4 of Title I of ERISA and the prohibited transaction provisions of ERISA
and the Code would be applicable to any transactions involving EOP's assets and
(ii) persons who exercise any authority or control over EOP's assets, or who
provide investment advice for a fee or other compensation to EOP, would be (for
purposes of ERISA and the Code) fiduciaries of ERISA Plans, and of Other Plans
that acquire EOP Common Shares. The United States Department of Labor (the
"DOL"), which has certain administrative responsibility over ERISA Plans and
Other Plans, has issued a regulation defining plan assets for certain purposes
(the "DOL Regulation"). The DOL Regulation generally provides that when an ERISA
Plan acquires a security that is an equity interest in an entity and that
security is neither a "publicly offered security" nor a security issued by an
investment company registered under the 1940 Act, the assets of the ERISA Plan
include both the equity interest and an undivided interest in each of the
underlying assets of the entity, unless it is established either that the entity
is an "operating company" (as defined in the DOL Regulation) or that equity
participation in the entity by "benefit plan investors" is not significant.
 
     The DOL Regulation defines a "publicly offered security" as a security that
is "widely held," "freely transferable" and either part of a class of securities
registered under the Exchange Act, or sold pursuant to an effective registration
statement under the Securities Act (provided the securities are registered under
the Exchange Act within 120 days, or such later time as may be allowed by the
Commission (the "Registration Period"), after the end of the fiscal year of the
issuer during which the offering occurred).
 
     The DOL Regulation provides that a security is "widely held" only if it is
part of a class of securities that is owned by 100 or more investors independent
of the issuer and of one another. A security will not fail to be "widely held"
because the number of independent investors falls below 100 subsequent to the
initial public offering as a result of events beyond the issuer's control.
 
     The DOL Regulation provides that whether a security is "freely
transferable" is a factual question to be determined on the basis of all
relevant facts and circumstances. The DOL Regulation further provides that where
a security is part of an offering in which the minimum investment is $10,000 or
less, certain restrictions ordinarily will not, alone or in combination, affect
a finding that such securities are "freely transferable." The restrictions on
transfer enumerated in the DOL Regulation as ordinarily not affecting a finding
that the securities are "freely transferable" include: (i) any restriction on or
prohibition against any transfer or assignment that would result in a
termination or reclassification of EOP for federal or state tax purposes, or
that would otherwise violate any state or federal law or court order, (ii) any
requirement that advance notice of a transfer or assignment be given to EOP,
(iii) any requirement that either the transferor or transferee, or both, execute
documentation setting forth representations as to compliance with any
restrictions on transfer that are among those enumerated in the DOL Regulation
as not affecting free transferability, (iv) any administrative procedure that
established an effective date, or an event (such as completion of an IPO) prior
to which a transfer or assignment will not be effective, (v) any prohibition
against transfer or assignment to an ineligible or unsuitable investor, and (vi)
any limitation or restriction on transfer or assignment that is not imposed by
the issuer or a person acting for or on behalf of the issuer. EOP believes that
the restrictions imposed under the Declaration of Trust on the transfer of EOP
Common Shares are of the type of restrictions on transfer generally permitted
under the DOL Regulation or are not otherwise material and should not result in
the failure of the EOP Common Shares to be "freely transferable" within the
meaning of the DOL Regulation. See "SHARES OF BENEFICIAL
INTEREST -- Restrictions on Transfer." EOP also believes that certain
restrictions on transfer that derive from the securities laws and from certain
provisions should not result in the failure of the EOP Common Shares to be
"freely transferable." Furthermore, EOP is not aware of any other facts or
circumstances limiting the transferability of the EOP Common Shares that are not
included among those enumerated as not affecting their free transferability
under the DOL Regulation, and EOP does not expect to impose in the future (or to
permit any person to impose on its behalf) any other limitations or restrictions
on transfer that would not be among the enumerated permissible limitations or
restrictions.
 
                                       231
<PAGE>   240
 
     Assuming (i) that the EOP Common Shares are "widely held" within the
meaning of the DOL Regulation and (ii) that no facts and circumstances other
than those referred to in the preceding paragraph exist that restrict
transferability of the EOP Common Shares, EOP believes that, under the DOL
Regulation, EOP Common Shares should be considered "publicly offered securities"
and, therefore, that the underlying assets of EOP should not be deemed to be
plan assets of any ERISA Plan or Other Plan that invests in the EOP Common
Shares.
 
     The DOL Regulation will also apply in determining whether the underlying
assets of EOP Partnership will be deemed to be plan assets. The EOP Partnership
Units will not be publicly offered securities. If the underlying assets of EOP
are not deemed to be assets of any ERISA Plan or Other Plan investor in EOP, EOP
believes that the indirect investment in EOP Partnership by ERISA Plans or Other
Plans through their ownership of the EOP Common Shares will not cause the assets
of EOP Partnership to be treated as plan assets. Furthermore, the EOP
Partnership Agreement provides that if and so long as the partnership interests
of "benefit plan investors" are "significant," EOP shall conduct the affairs of
the EOP Partnership as a "real estate operating company" ("REOC"), as that term
is defined in the DOL Regulations. Based upon counsel's advice, EOP believes
that EOP Partnership has operating as a REOC as of the Consolidation.
 
                                    EXPERTS
 
     The combined financial statements of EOP Predecessors at December 31, 1996
and 1995, and for each of the three years in the period ended December 31, 1996,
the statements of revenue and certain expenses for 177 Broad Street, Preston
Commons, Oakbrook Terrace Tower, One Maritime Plaza, 201 Mission Street, 30 N.
LaSalle, Columbus America Properties, Prudential Properties, 550 South Hope
Street, Acorn Properties, 10 & 30 South Wacker Drive, One Lafayette Centre and
PPM Properties, all appearing in this Proxy Statement/Prospectus and
Registration Statement, have been audited by Ernst & Young LLP, independent
auditors, and the information under the captions "EOP Partnership Summary
Selected Consolidated and Combined Financial Data" and "EOP Partnership Selected
Consolidated and Combined Financial Information" at December 31, 1996 and 1995,
and for each of the three years in the period ended December 31, 1996 appearing
in this Proxy Statement/Prospectus and Registration Statement have been derived
from combined financial statements audited by Ernst & Young LLP, as set forth in
their report appearing herein. Such combined financial statements and selected
financial data are included in reliance upon such reports given upon the
authority of such firm as experts in accounting and auditing.
 
     The consolidated balance sheets of Beacon Partnership as of December 31,
1996 and 1995 and the related consolidated statements of operations, partners'
capital and cash flows for the years ended December 31, 1996 and 1995 and for
the period May 26, 1994 to December 31, 1994, the combined statement of
operations, owners' equity (deficit) and cash flows for the period January 1,
1994 to May 25, 1994 of The Beacon Group, predecessor to Beacon, and the related
financial statement schedules of Beacon as of December 31, 1996, appearing
elsewhere in this Proxy Statement/Prospectus and Registration Statement, have
been so included in reliance on the report of Coopers & Lybrand L.L.P.,
independent accountants, given on the authority of that firm as experts in
accounting and auditing.
 
     The statement of excess of revenues over specific operating expenses for
225 Franklin Street in Boston, Massachusetts for the year ended December 31,
1996, appearing elsewhere in this Proxy Statement/ Prospectus and Registration
Statement, has been so included in reliance on the reports of Coopers & Lybrand
L.L.P., independent accountants, given on the authority of said firm as experts
in accounting and auditing.
 
                                 LEGAL MATTERS
 
     The validity of the EOP Partnership Units will be passed upon for EOP by
Hogan & Hartson L.L.P., Washington, D.C. Certain matters of Maryland law will be
passed upon for EOP by Ballard Spahr Andrews & Ingersoll, Baltimore, Maryland.
Certain tax matters will be passed upon for EOP by Hogan & Hartson L.L.P.,
Washington, D.C., special tax counsel for EOP.
 
                                       232
<PAGE>   241
 
     Certain legal and tax matters will be passed upon for Beacon by Goodwin,
Procter & Hoar LLP, Boston, Massachusetts, a limited liability partnership
including professional corporations, as corporate, securities and tax counsel to
Beacon. Gilbert G. Menna, whose professional corporation is a partner of
Goodwin, Procter & Hoar LLP, is an assistant secretary of Beacon and owns in
excess of 1,000 Beacon Common Shares. Certain matters of Maryland law will be
passed upon for Beacon by Ballard Spahr Andrews & Ingersoll, Baltimore,
Maryland.
 
                                 OTHER MATTERS
 
     Beacon does not intend to bring any matter before the Beacon Partnership
Special Meeting other than as specifically set forth in the Notice of Special
Meeting of Unitholders, nor does it know of any matter to be brought before the
Beacon Partnership Special Meeting by others. If any other matters properly come
before the Beacon Partnership Special Meeting, however, it is the intention of
the persons named in the Beacon Partnership proxy to vote such proxy in
accordance with their best judgment.
 
                                       233
<PAGE>   242
 
                                    GLOSSARY
 
     For purposes of this Proxy Statement/Prospectus, the following capitalized
terms shall have the meanings set forth below:
 
     "ACBMs" means asbestos-containing building materials.
 
     "Acquisition Proposal" means any inquiry, proposal, discussion or
negotiation or the making or implementation of any proposal or offer (including,
without limitation, any proposal or offer to its shareholders) with respect to a
merger, acquisition, tender offer, exchange offer, transaction resulting in the
issuance of securities representing 10% or more of the outstanding equity
securities of Beacon, consolidation, share exchange, business combination, sale,
lease, exchange, mortgage, pledge, transfer or other disposition of 10% or more
of the assets or equity securities (including, without limitation, partnership
interests and units) of Beacon or Beacon Partnership, other than the
transactions contemplated by the Agreement.
 
     "Action" means any preliminary, temporary or other nonfinal judgment,
injunction, order, decree or action by any court.
 
     "Affiliates" means all persons who, at the time of the Shareholder
Meetings, may be deemed to be "Affiliates" of EOP or Beacon, as that term is
used in paragraphs (c) and (d) of Rule 145 of the Securities Act.
 
     "AFFO Multiple" means either the multiple of the Share Price to "adjusted"
forecasted 1997 Funds from Operations or to "adjusted" forecasted 1998 Funds
from Operations.
 
     "Agreement" means the agreement pursuant to which Beacon has agreed to
merge with and into EOP and Beacon Partnership has agreed to merge with and into
EOP Partnership.
 
     "Available Cash" means net cash flow from operations plus any reduction in
reserves and minus interest and principal payments on debt, capital
expenditures, any additions to reserves and other adjustments.
 
     "Beacon" means Beacon Properties Corporation, together with its
subsidiaries.
 
     "Beacon Annual Report" means Beacon's Annual Report on Form 10-K for the
year ended December 31, 1996, filed with the Commission pursuant to the Exchange
Act, including all amendments thereto.
 
     "Beacon Articles" means the Articles of Incorporation of Beacon.
 
     "Beacon Board" means the Board of Directors of Beacon.
 
     "Beacon Break-Up Expenses" means the expenses of EOP payable by Beacon and
Beacon Partnership upon the termination of the Agreement under certain
circumstances.
 
     "Beacon Bylaws" means the Bylaws adopted by the Board of Directors of
Beacon.
 
     "Beacon Common Shares" means the shares of common stock, $0.01 par value
per share, of Beacon.
 
     "Beacon Construction Company" means Beacon Construction Company, Inc., a
Massachusetts corporation.
 
     "Beacon Design Company" means Beacon Design Corporation, a Massachusetts
corporation.
 
     "Beacon Excess Shares" means the excess shares, $0.01 par value per share,
of Beacon.
 
     "Beacon Initial Offering" means Beacon's initial public offering.
 
     "Beacon Junior Shares" means shares of Beacon ranking junior to the Beacon
Preferred Shares as to distributions and upon liquidation (including Beacon
Common Shares).
 
     "Beacon Management Company" means Beacon Property Management Corporation, a
Delaware corporation.
 
     "Beacon Market Price" means the price equal to the aggregate market price
of any particular Beacon security determined pursuant to the Beacon Articles.
 
                                       234
<PAGE>   243
 
     "Beacon Ownership Limit" means the Look Through Ownership Limit and the 6%
Ownership Limit.
 
     "Beacon Parity Shares" means all series of preferred shares of beneficial
interest (other than Beacon Preferred Shares) ranking on a parity with the
Beacon Preferred Shares as to dividends or on liquidation.
 
     "Beacon Partnership" means Beacon Properties, L.P.
 
     "Beacon Partnership Agreement" means the Amended and Restated Agreement of
Limited Partnership of Beacon Partnership.
 
     "Beacon Partnership Unit" means a common partnership unit of Beacon
Partnership.
 
     "Beacon Preferred Shareholders" means the holders of Beacon Preferred
Shares.
 
     "Beacon Preferred Shares" means the 8.98% Series A Cumulative Redeemable
Preferred Stock, liquidation preference $25.00 per share, of Beacon.
 
     "Beacon Preferred Units" means the 8.98% Series A Preferred Units of Beacon
Partnership.
 
     "Beacon Properties" means one or more of the office properties and other
commercial properties in which Beacon Partnership has an interest.
 
     "Beacon Record Date" means November 14, 1997.
 
     "Beacon Securityholders" means Beacon Shareholders, Beacon Preferred
Shareholders, or Beacon Unitholders.
 
     "Beacon Senior Convertible Securities" means any obligations or securities
convertible into or evidencing the right to purchase any Beacon Senior Shares.
 
     "Beacon Senior Shares" means any class or series of shares ranking prior to
the Beacon Preferred Shares with respect to payment of dividends or the
distribution of assets upon liquidation, dissolution or winding up of Beacon.
 
     "Beacon Service Companies" means the Beacon Construction Company, the
Beacon Design Company, and the Beacon Management Company.
 
     "Beacon Shareholders" means the holders of Beacon Common Shares.
 
     "Beacon Shares" means any class or series of stock of Beacon.
 
     "Beacon Special Meeting" means the Special Meeting of Shareholders of
Beacon (including any adjournments or postponements thereof).
 
     "Beacon Stock Options" means Beacon's Amended and Restated 1994 Stock
Option and Incentive Plan and Beacon's 1996 Stock Option Plan.
 
     "Beacon Unitholders" means the holders of Beacon Partnership Units.
 
     "Beacon Voting Agreement" means the voting agreement entered into by
certain members of the Beacon Board, their families, and trusts and partnerships
established for the benefit of the members of the families of these members of
the Beacon Board.
 
     "Book-Tax Difference" has the meaning ascribed to it in the section
entitled "FEDERAL INCOME TAX CONSIDERATIONS -- Tax Aspects of EOP's Ownership of
Interests in the ZML Opportunity Partnerships and EOP Partnerships -- Tax
Allocations with Respect to the Properties."
 
     "Break-Up Fee" means the fee of up to $75 million payable by Beacon and
Beacon Partnership to EOP Partnership in the event the Agreement is terminated
under certain circumstances.
 
     "Built-In Gain" means the excess of (a) the fair market value of a Built-In
Gain Asset over (b) the adjusted basis in such asset, determined as of the
beginning of the Recognition Period.
 
                                       235
<PAGE>   244
 
     "Business Combination" means any transaction, approval of which requires by
law the affirmative vote of shareholders and pursuant to which EOP's business
and assets will be combined with those of one or more entities (whether by
merger, sale or other transfer of assets, consolidation or share exchanged).
 
     "Cash Available for Distribution" means Funds from Operations adjusted for
certain non-cash items, less reserves.
 
     "CBD" means central business district.
 
     "Charitable Beneficiary" means the qualified charitable organization
selected by EOP to be the beneficiary of a Charitable Trust.
 
     "Charitable Trust" means the trust that will hold the excess shares
described under "COMPARATIVE RIGHTS OF SHAREHOLDERS -- REIT Qualification
Provisions -- EOP."
 
     "Charitable Trustee" means the trustee of the Charitable Trust.
 
     "Code" means the Internal Revenue Code of 1986, as amended.
 
     "Commission" means the Securities and Exchange Commission.
 
     "Commitment" means any commitment to acquire, enter into any option to
acquire, or exercise an option or other right or election or enter into any
other commitment or contractual obligation.
 
     "Company Merger" means the proposed merger of Beacon with and into EOP.
 
     "Comparable Company" means a selected publicly traded company engaged in
business which J.P. Morgan judged to be analogous to that of Beacon's.
 
     "Comparable Transaction" means the comparable transactions listed under
"THE MERGER -- Opinions of Financial Advisors -- Beacon -- Comparable
Transaction Analysis."
 
     "Consolidation" means all of the transactions described under "BUSINESS OF
EOP -- Formation Transactions."
 
     "Contribution Agreement" means the agreement pursuant to which the ZML
Funds and EOP agreed to consolidate.
 
     "Control Share Acquisition" means the direct or indirect acquisition of
control shares, subject to certain exceptions.
 
     "Control Shares" means voting shares which, if aggregated with all other
such shares previously acquired by the acquiror or in respect of which the
acquiror is entitled to exercise or direct the exercise of voting power (except
solely by virtue of a revocable proxy), would entitle the acquiror, directly or
indirectly, to exercise or direct the exercise of voting power in electing
directors within one of the following ranges of voting power: (i) one-fifth or
more but less than one-third of all voting power, (ii) one-third or more but
less than a majority of all voting power or (iii) a majority or more of all
voting power.
 
     "Core Portfolio" means the Properties that were held by the EOP
Predecessors during the entire period for both years being compared.
 
     "Credit Facilities" means EOP's $1.5 billion unsecured term loan facility
and EOP's $600 million unsecured revolving line of credit.
 
     "Debt to Market Capitalization Ratio" means the total consolidated and
unconsolidated debt of EOP or Beacon, as applicable, as a percentage of the
market value of such entity's outstanding common shares and partnership units
plus total consolidated and unconsolidated debt, but excluding (i) all
nonrecourse consolidated debt in excess of such entity's proportionate share of
such debt and (ii) all nonrecourse unconsolidated debt of partnerships in which
such entity is a limited partner.
 
     "Declaration of Trust" means EOP's declaration of trust, as amended from
time to time, and as filed with the State Department of Assessments and Taxation
of Maryland.
 
                                       236
<PAGE>   245
 
     "Department" means the State Department of Assessments and Taxation of
Maryland.
 
     "Distribution Payout Ratio" means the ratio of distributions per share of
common stock over Funds from Operations per share of common stock.
 
     "Distribution Period" means the period, quarterly or shorter, for which the
EOP Partnership Agreement requires the distribution of Available Cash.
 
     "DOL" means the United States Department of Labor.
 
     "DOL Regulation" means the regulation issued by the DOL defining Plan
Assets for certain purposes.
 
     "EBITDA" means earnings before interest, taxes, depreciation and
amortization.
 
     "Effective Time" means the time when the Mergers shall become effective.
 
     "EGI" means Equity Group Investments, Inc., an Illinois corporation.
 
     "Eligible Transferee" means the persons or entities to whom a number of
shares of Beacon Shares in excess of the Beacon Ownership Limit can ultimately
be transferred without violating the Beacon Ownership Limit.
 
     "Employee Plan" means EOP's 1997 Share Option and Share Award Plan.
 
     "Environmental Laws" means federal, state and local laws and regulations
relating to protection of the environment.
 
     "EOH" means Equity Office Holdings, L.L.C., a Delaware limited liability
company, and/or its successors and assigns.
 
     "EOP" means either Equity Office Properties Trust, a Maryland real estate
investment trust, alone as an entity, or, as the context may require, the
combined enterprise consisting of Equity Office Properties Trust, EOP
Partnership and their subsidiaries. All references to the historical activities
of EOP refer to the activities of the EOP Predecessors.
 
     "EOP Board" means the Board of Trustees of EOP.
 
     "EOP Break-Up Expenses" means the expenses of Beacon payable by EOP and EOP
Partnership to Beacon Partnership upon the termination of the Agreement under
certain circumstances.
 
     "EOP Bylaws" means the Bylaws adopted by the Board of Trustees of EOP.
 
     "EOP Common Shares" means the common shares of beneficial interest, $0.01
par value per share, of EOP.
 
     "EOP Joint Venture Properties" means 18 of the EOP Properties which are
held in partnerships or subject to participation agreements with unaffiliated
third parties.
 
     "EOP Junior Shares" means shares of EOP (including EOP Common Shares)
ranking junior to the EOP Preferred Shares as to distributions and upon
liquidation.
 
     "EOP LLC" means Equity Office Properties, L.L.C., a Delaware limited
liability company.
 
     "EOP Management Corp." means Equity Office Properties Management Corp., a
Delaware corporation.
 
     "EOP Market Price" means the market price of any particular EOP security,
as determined pursuant to the Declaration of Trust.
 
     "EOP Office Properties" means the office properties in which EOP owns or
has an interest.
 
     "EOP Ownership Limit" means 9.9% (in value or number of shares, whichever
is more restrictive) of the EOP Shares of any class or series.
 
     "EOP Parity Shares" means all series of preferred shares of beneficial
interest (other than EOP Preferred Shares) ranking on a parity with the EOP
Preferred Shares as to distributions or on liquidation.
 
                                       237
<PAGE>   246
 
     "EOP Parking Facilities" means the stand-alone parking facilities owned by
EOP Partnership.
 
     "EOP Partnership" means EOP Operating Limited Partnership, a Delaware
limited partnership, alone, or as the context may require, together with its
subsidiaries.
 
     "EOP Partnership Agreement" means the limited partnership agreement of EOP
Partnership.
 
     "EOP Partnership Unit" means a unit of partnership interest in EOP
Partnership.
 
     "EOP Predecessors" or "Equity Office Predecessors" means, on a combined
basis, the EOP Office Properties and Parking Facilities of the ZML Funds and the
Management Business of the Equity Group that were combined into EOP pursuant to
the Consolidation.
 
     "EOP Predecessor Securityholders" means certain entities affiliated with
Mr. Zell which are predecessors to EOP and several trusts established for the
benefit of members of the family of Mr. Zell.
 
     "EOP Preferred Shares" means the 8.98% Series A Cumulative Redeemable
Preferred Shares, liquidation preference $25.00 per share, of EOP.
 
     "EOP Preferred Units" means the 8.98% Series A Preferred Units of EOP
Partnership.
 
     "EOP Properties" means collectively, one or more of the EOP Office
Properties and one or more of the EOP Parking Facilities more particularly
described in the section entitled "THE EOP PROPERTIES."
 
     "EOP Record Date" means November 14, 1997.
 
     "EOP Securityholders" means EOP Shareholders, EOP Preferred Shareholders
and EOP Unitholders.
 
     "EOP Senior Convertible Securities" means any obligations or securities
convertible into or evidencing the right to purchase any EOP Senior Shares.
 
     "EOP Senior Shares" means any class or series of shares ranking prior to
the EOP Preferred Shares with respect to payment of distributions or the
distribution of assets upon liquidation, dissolution or winding up of EOP.
 
     "EOP Shareholders" means the holders of EOP Common Shares.
 
     "EOP Shares" means the issued and outstanding shares of beneficial interest
of EOP.
 
     "EOP Special Meeting" means the Special Meeting of Shareholders of EOP
(including any adjournments or postponements thereof).
 
     "EOP Unitholders" means the holders of record of EOP Partnership Units.
 
     "EOP Unsecured Notes" means the $30 million of 7.24% Senior Notes due 2004,
the $50 million of 7.36% Senior Notes due 2005, the $50 million of 7.44% Senior
Notes due 2006 and the $50 million of 7.41% Senior Notes due 2007 of EOP issued
in September 1997.
 
     "EOP Voting Agreement" means a voting agreement entered into by each of the
several trusts established for the benefit of members of the family of Samuel
Zell, and certain of the EOP Predecessors.
 
     "Equity Group" means one or both of EGI and EOH, and/or its or their
successors and assigns.
 
     "Equity Group Owners" means certain trusts established for the benefit of
the families of Mr. Zell and of Mr. Robert Lurie, the deceased former partner of
Mr. Zell, and the partnerships comprised of such trusts.
 
     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.
 
     "ERISA Plan" means an employee benefit plan subject to Title I of ERISA.
 
     "Excepted Holder Limit" means the EOP Ownership Limit or such higher
percentage applicable to such holder approved by the EOP Board (in value or
number of shares, whichever is more restrictive).
 
     "Exchange Act" means the Securities Exchange Act of 1934, as amended.
 
                                       238
<PAGE>   247
 
     "Exchange Agent" means Boston EquiServe, L.P., an affiliate of BankBoston,
N.A.
 
     "Exchange Ratio" means the number of EOP Common Shares to be exchanged for
each Beacon Common Share pursuant to the Merger.
 
     "Excise Tax" means any excise tax imposed by Section 4999 of the Code,
together with any interest or penalties.
 
     "Expected Offering" means the anticipated issuance by EOP of preferred
shares and/or senior unsecured notes in early 1998.
 
     "FCBA" means First Capital Benefit Administrators, Inc., a wholly owned
indirect subsidiary of Great American Management and Investment, Inc.
 
     "FFO" means Funds from Operations.
 
     "FFO Multiple" means either the multiple of the Share Price to forecasted
1997 Funds from Operations or to forecasted 1998 Funds from Operations.
 
     "FFO to Growth Multiple" means the multiple of 1998 forecasted Funds from
Operations to Share Price to the forecasted Funds from Operations five year
growth rate.
 
     "Final Beacon Distribution" means the dividend declared by Beacon to the
extent necessary to satisfy the requirements of Section 857(a)(1) of the Code
for the taxable year of Beacon ending at the Effective Time (and avoid the
payment of tax with respect to undistributed income).
 
     "FIRPTA" means the Foreign Investment in Real Property Tax Act.
 
     "First Call" means an on line data service available to subscribers which
compiles earnings estimates by research analysts.
 
     "5/50 Rule" means the requirement in the Code's REIT definition that not
more than 50% in value of the outstanding shares of a REIT of which is owned
directly or indirectly by five or fewer individuals (as defined in the Code to
include certain entities) during the last half of each taxable year.
 
     "Formation Transactions" means the transactions engaged in prior to or
simultaneously with the completion of EOP's IPO which were designed to
consolidate the ownership of the EOP Properties, to facilitate the IPO and to
enable EOP to qualify as a REIT.
 
     "401(k) Plan" means the Equity Office Properties Trust Section 401(k)
Savings/Retirement Plan.
 
     "$475 Million Line" means the acquisition/term loan facility ZML Fund IV
entered into in September, 1996.
 
     "Funds from Operations" means net income (loss) computed in accordance with
GAAP, excluding gains (or losses) from debt restructuring and sales of property,
plus real estate related depreciation and amortization and after adjustments for
unconsolidated partnerships and joint ventures. Management believes that Funds
from Operations is helpful to investors as a measure of the performance of an
equity REIT because, along with cash flow from operating activities, financing
activities and investing activities, it provides investors with an indication of
the ability of EOP to incur and service debt, to make capital expenditures and
to fund other cash needs. EOP computes Funds from Operations in accordance with
standards established by the White Paper on Funds from Operations approved by
the Board of Governors of NAREIT in March 1995 which may differ from the
methodology for calculating Funds from Operations utilized by other equity REITs
and, accordingly, may not be comparable to such other REITs. Funds from
Operations should not be considered as an alternative to net income (determined
in accordance with GAAP) as an indicator of EOP's financial performance or to
cash flow from operating activities (determined in accordance with GAAP) as a
measure of EOP's liquidity, nor is it indicative of funds available to fund
EOP's cash needs, including its ability to make distributions.
 
     "GAAP" means generally accepted accounting principles in the United States.
 
                                       239
<PAGE>   248
 
     "Goodwin, Procter & Hoar" means Goodwin, Procter & Hoar LLP.
 
     "Gross-Up Payment" means the additional payment an officer will be entitled
to in the event the Severance Payments and the Performance Payments would be
subject to an Excise Tax such that the net amount retained by the officer after
payment of the Excise Tax and the income taxes due as a result of receipt of the
Gross-Up Payment will equal the Severance Payments and the Performance Payment.
 
     "Hogan & Hartson" means Hogan & Hartson L.L.P.
 
     "Impermissible Tenant Service Income" means the amount received by a REIT
for operating or managing a property or furnishing or rendering services to the
tenants of a property other than through an independent contractor from whom the
REIT derives no revenue (not including services "usually or customarily
rendered" in connection with the rental of real property and not otherwise
considered "rendered to the occupant").
 
     "Implied Purchase Price" means $47.02 per Beacon Common Share.
 
     "Indemnified Parties" means each person who is now or has been at any time
prior to the date of the Agreement or who becomes prior to the Effective Time an
officer or director of Beacon or any Beacon Subsidiary.
 
     "Indemnitee" means any member of the classes of individuals described under
"COMPARATIVE RIGHTS OF SHAREHOLDERS -- Indemnification -- Beacon."
 
     "Indenture" means the written agreement which governs the issuance of the
EOP Unsecured Notes and contains financial and operating covenants related
thereto.
 
     "institutional quality" means the type of properties that pension funds,
insurance companies and other such investors have historically found to be
attractive investments over the long run. These properties tend to have superior
locations and a higher level of physical improvement than all real estate assets
taken as a whole.
 
     "institutional sellers" means pension funds, insurance companies, other
REITs, commercial banks, saving associations and funds comprised of such
investors.
 
     "Interested Shareholder" means any person who beneficially owns 10% or more
of the voting power of a Maryland real estate investment trust's shares of
beneficial interest or any person who, at any time within the two-year period
prior to the date in question, was the beneficial owner of 10% or more of the
voting power of the outstanding voting shares of beneficial interest of the
trust.
 
     "Investor Limited Partner" means the ZML Investor who is a limited partner
of Opportunity Partnership II.
 
     "IPO" means initial public offering.
 
     "IRS" means the United States Internal Revenue Service.
 
     "J.P. Morgan" means J.P. Morgan Securities, Inc.
 
     "leased" means all space for which leases have been executed, whether or
not the lease term has commenced.
 
     "LIBOR" means the London Interbank Offering Rate.
 
     "LLC" means limited liability company.
 
     "Look Through Ownership Limit" means 9.9% of the aggregate value of all
outstanding Beacon Shares.
 
     "Managed Properties" means the properties of the Equity Group, together
with the EOP Joint Venture Properties, to be managed by EOP Management Corp.
 
     "Managed Property Business" means that portion of the Management Business
that relates to property management of the Managed Properties and the EOP Joint
Venture Properties, which business is owned and conducted by EOP Management
Corp.
 
                                       240
<PAGE>   249
 
     "Management Business" means the office property management business, the
office property asset management business and the parking asset management
business contributed to EOP Partnership in the EOP Formation Transactions EGI
and EOH.
 
     "Market Interest Rate" means the current market credit spread for each loan
when added to the annualized monthly Treasury rate.
 
     "market rent" represents the average asking gross rental rate per rentable
square foot for buildings management believes to be of comparable size, class,
location and age based upon information obtained from CB Commercial Real Estate
Group, Inc./Torto Wheaton Research, as of March 31, 1997.
 
     "Maryland REIT Law" means Title 8 of the Corporations and Associations
Article of the Annotated Code of Maryland, as amended from time to time.
 
     "Merger Consideration" means that number of EOP Common Shares and EOP
Preferred Shares to be issued pursuant to the Mergers.
 
     "Mergers" means both the Company Merger and the Partnership Merger.
 
     "Merrill Lynch" means Merrill Lynch & Co. or its affiliates.
 
     "MGCL" means the Maryland General Corporation Law, as amended from time to
time.
 
     "Morgan Stanley" means Morgan Stanley & Co. Incorporated
 
     "Morgan Stanley Opinion" means the written opinion of Morgan Stanley dated
September 15, 1997.
 
     "Named Executive Officers" means EOP's Chief Executive Officer and EOP's
four other most highly paid executive officers.
 
     "NAREIT" means the National Association of Real Estate Investment Trusts,
Inc.
 
     "1940 Act" means the Investment Company Act of 1940, as amended.
 
     "1997 Act" means the Taxpayer Reform Act of 1997.
 
     "NOI" means net operating income.
 
     "Non-ERISA Plan" means a qualified pension, profit sharing or stock bonus
plan not subject to ERISA.
 
     "Non-U.S. Shareholders" means nonresident alien individuals, foreign
corporations, foreign partnerships and other foreign shareholders.
 
     "NYSE" means the New York Stock Exchange, Inc.
 
     "occupied" means all space which is leased and for which the lease term has
commenced.
 
     "Offering" means EOP's IPO.
 
     "$1.5 billion Credit Facility" means EOP's $1.5 billion unsecured term loan
facility.
 
     "Other Plans" means an IRA and a Non-ERISA Plan.
 
     "Ownership Limit" means 9.9% of the lesser of the number or value of the
issued and outstanding EOP Common Shares or Beacon Common Shares, as the case
may be, and 9.9% of the lesser of the number or value of the outstanding shares
of any other class or series of beneficial interest of EOP or Beacon, as the
case may be.
 
     "Partial Liquidation Date" means each of the 15-month, 18-month, 21-month
and 24-month anniversaries of the Closing.
 
     "Partnership Act" means the Delaware Revised Uniform Limited Partnership
Act.
 
     "Partnership Merger" means the merger of Beacon Partnership with and into
EOP Partnership or a limited liability company or limited partnership wholly
owned directly or indirectly by EOP Partnership.
 
                                       241
<PAGE>   250
 
     "Peer Group" means Boston Properties, Inc.; Cali Realty Corporation;
CarrAmerica Realty Corporation; Cornerstone Properties, Inc.; Duke Realty
Investments, Inc.; Highwoods Properties, Inc.; Prentiss Properties Trust;
Reckson Associates Realty Corp.; Spieker Properties, Inc.; Beacon (when
comparing comparable companies to EOP); and EOP (when comparing comparable
companies to Beacon).
 
     "Peer Group II" means Equity Residential Properties Trust in the
multifamily REIT sector; Starwood Lodging Trust in the hotel REIT sector; Simon
DeBartolo Group, Inc. in the regional mall REIT sector; Vornado Realty Trust in
the nonmall retail REIT sector; Public Storage, Inc. in the self-storage REIT
sector; Meditrust in the health care REIT sector; and The Mills Corporation in
the factory outlet center REIT sector.
 
     "Performance Payment" means the cash payment to an officer representing the
officer's share of the performance pool under Beacon's Extraordinary Performance
Stock Incentive Plan for Senior Executives.
 
     "Person" means an individual, corporation, partnership, limited liability
company, joint venture, association, trust, unincorporated organization or other
entity.
 
     "Plan Assets" means the assets of EOP deemed to be assets of an ERISA Plan.
 
     "Preferred Shares" means the preferred shares of beneficial interest, $0.01
par value per share, of EOP.
 
     "Pre-Merger Distributions" has the meaning ascribed to it in the section
entitled "FEDERAL INCOME TAX CONSIDERATIONS -- Pre-Merger Distributions."
 
     "Premium to NAV" means the premium obtained by computing the percentage
excess of the Share Price over the net asset value per share.
 
     "Premium to Sector Median" means the premium obtained by computing the
percentage excess of each company's Funds from Operations multiple over the
median 1998 Funds from Operations multiples for each company's respective
industry sector.
 
     "Premiums to 52 Week High Share Price" means the percentage excess of the
price per share paid over the high share price over the course of the 52 weeks
prior to the announcement of the Comparable Transaction.
 
     "Premiums to Unaffected Share Price" means the percentage excess of the
price per share paid over the average stock price of the ten trading days ending
five trading days prior to the announcement of the Comparable Transaction.
 
     "Private Debt Offering" means the private debt offering of the EOP
Unsecured Notes.
 
     "Probable Acquisitions" means all EOP acquisitions identified as probable
in EOP's pro forma financial statements.
 
     "Prohibited Owner" means a purported transferee and any person or entity
who would have been the record holder of such EOP Shares as a result of the
transfers described under "COMPARATIVE RIGHTS OF SHAREHOLDERS -- REIT
Qualification Provisions -- EOP."
 
     "Properties" means both EOP Properties and Beacon Properties.
 
     "Property Operating Expenses" means real estate taxes and insurance,
repairs and maintenance and property operating expenses.
 
     "Property Revenues" means rental revenues, tenant reimbursements, parking
income and other income.
 
     "Proposed Note Offering" means an anticipated offering of senior unsecured
notes by EOP in an aggregate amount between $750 million and $1 billion.
 
     "Proxy Statement/Prospectus" means this prospectus, as the same may be
amended.
 
     "Prudential" means the Prudential Insurance Company of America.
 
     "Purchase Plan" means the 1997 Non-Qualified Employee Share Purchase Plan.
 
                                       242
<PAGE>   251
 
     "Recognition Period" means the ten-year period beginning on the date on
which a Built-In Gain Asset was acquired.
 
     "Record Dates" means both the EOP Record Date and the Beacon Record Date.
 
     "Registration Rights Agreements" means the existing registration rights
agreements between Beacon and the Registration Rights Holders.
 
     "Registration Rights Holders" means certain Beacon Unitholders who have
registration rights under the Registration Rights Agreements.
 
     "Registration Statement" means the registration statement of EOP on Form
S-4, together with all amendments and exhibits, of which this Proxy
Statement/Prospectus is a part.
 
     "REIT" means a real estate investment trust as defined under Sections 856
through 860 of the Code and applicable Treasury regulations.
 
     "Related Party Tenant" under the Code means a tenant of EOP's real property
in which EOP or an owner of 10.0% or more of EOP, directly or constructively
owns 10.0% or more of the ownership interests.
 
     "Restricted EOP Common Shares" means the EOP Common Shares received by the
ZML Investors and ZML Partners in EOP's Formation Transactions or any EOP Common
Shares acquired in redemption of EOP Partnership Units.
 
     "Securities Act" means the Securities Act of 1933, as amended.
 
     "Service Companies" means third-party parking garage service companies
which lease and operate all but one of EOP's Parking Facilities.
 
     "Severance Payments" means any payment made pursuant to the Senior
Executive Severance Agreements or the Executive Severance Plan.
 
     "Share Price" means the common stock trading price of a member of the Peer
Group as of September 12, 1997.
 
     "Shareholder Meetings" means both the Beacon Special Meeting and the EOP
Special Meeting.
 
     "6% Ownership Limit" means 6% of the aggregate value of all outstanding
Beacon Shares.
 
     "SPLP" means Standard Parking Limited Partnership, a limited partnership
which manages the parking operations of certain EOP Office Properties.
 
     "Stock Purchase Agreements" means the stock purchase agreements between the
holders of 99% of the voting stock of each of the Beacon Service Companies and
EOP Management Corp.
 
     "Subsidiary" or "Subsidiaries" of any party means, generally, any
corporation, partnership, limited liability company, joint venture, trust or
other legal entity of which such Person owns (either directly or through or
together with another Subsidiary of such Person) either (i) a general partner,
managing member or other similar interest, or (ii) (A) 10% or more of the voting
power of the voting capital stock or other equity interest, or (B) 10% or more
of the outstanding voting capital stock or other voting equity interests of such
corporation, partnership, limited liability company, joint venture or other
legal entity. In addition to the entities described above, the term Subsidiary
includes, with respect to EOP, EOP Management Corp., and with respect to Beacon,
Beacon Management Company, Beacon Design Company, and Beacon Construction
Company.
 
     "Sunnyvale Business Center" means a three-building office complex located
in Sunnyvale, California.
 
     "Superior Acquisition Proposal" means a bona fide Acquisition Proposal made
by a third party which a majority of the members of the Beacon Board resolves in
good faith to be in the best interests of and more favorable to Beacon's
Shareholders than the Merger and which the Beacon Board determines is reasonably
capable of being consummated.
 
                                       243
<PAGE>   252
 
     "Third Party Service Companies" means EOP Management Corp., and with
respect to Beacon, Beacon Management Company, Beacon Design Company, and Beacon
Construction Company.
 
     "Total Portfolio" means the EOP Office Properties and stand alone EOP
Parking Facilities which EOP owned or had an interest in as of July 31, 1997.
 
     "Transaction Comparables" means the thirteen transactions listed in the
section entitled "THE MERGER -- Opinions of Financial
Advisors -- EOP -- Selected Transaction Analysis."
 
     "Transferor" means any person or entity holding a number of shares of
Beacon Shares in excess of the Beacon Ownership Limit (unless waived by the
Beacon Board).
 
     "Treasury Regulations" means the regulations promulgated by the IRS under
the Code.
 
     "UBTI" means unrelated business taxable income as defined in Section 512(a)
of the Code.
 
     "Unit Redemption Right" means the right of holders of EOP Partnership Units
to require the redemption of their EOP Partnership Units.
 
     "UPREIT" means umbrella partnership REIT.
 
     "U.S. Shareholder" means a holder of Common Shares who (for United States
federal income tax purposes) (i) is a citizen or resident of the United States,
(ii) is a corporation, partnership, or other entity created or organized in or
under the laws of the United States or of any political subdivision thereof, or
(iii) is an estate or trust the income of which is subject to United States
federal income taxation regardless of its source.
 
     "UST" means an underground storage tank.
 
     "ZML Fund I" means Opportunity Partnership I and its general and limited
partners, including ZML REIT I.
 
     "ZML Fund II" means Opportunity Partnership II and its general and limited
partners, including ZML REIT II.
 
     "ZML Fund III" means Opportunity Partnership III and its general and
limited partners, including ZML REIT III.
 
     "ZML Fund IV" means Opportunity Partnership IV and its general and limited
partners, including ZML REIT IV.
 
     "ZML Funds" means, collectively, the ZML Opportunity Partnerships, together
with their limited and general partners, including the ZML REITs.
 
     "ZML Investors" means shareholders in the ZML REITs and limited partners
(other than the ZML REITs) in the ZML Opportunity Partnerships and/or their
successors and assigns.
 
     "ZML Opportunity Partnership I" means Zell/Merrill Lynch Real Estate
Opportunity Partners Limited Partnership.
 
     "ZML Opportunity Partnership II" means Zell/Merrill Lynch Real Estate
Opportunity Partners Limited Partnership II.
 
     "ZML Opportunity Partnership III" means Zell/Merrill Lynch Real Estate
Opportunity Partners Limited Partnership III.
 
     "ZML Opportunity Partnership IV" means Zell/Merrill Lynch Real Estate
Opportunity Partners Limited Partnership IV.
 
     "ZML Opportunity Partnerships" means, collectively, ZML Opportunity
Partnership I, ZML Opportunity Partnership II, ZML Opportunity Partnership III
and ZML Opportunity Partnership IV.
 
                                       244
<PAGE>   253
 
     "ZML Partner(s)" means ZML Partners Limited Partnership, ZML Partners
Limited Partnership II, ZML Partners Limited Partnership III and/or ZML Partners
Limited Partnership IV, as applicable, each of which is the current general
partner of, respectively, ZML Opportunity Partnership I, ZML Opportunity
Partnership II, ZML Opportunity Partnership III and ZML Opportunity Partnership
IV.
 
     "ZML REIT I" means ZML Investors, Inc., a Delaware corporation.
 
     "ZML REIT II" means ZML Investors II, Inc., a Delaware corporation.
 
     "ZML REIT III" means Zell/Merrill Lynch Real Estate Opportunity Partners
III Trust, a Maryland real estate investment trust.
 
     "ZML REIT IV" means Zell/Merrill Lynch Real Estate Opportunity Partners IV
Trust, a Maryland real estate investment trust.
 
     "ZML REITs" means, collectively, ZML REIT I, ZML REIT II, ZML REIT III and
ZML REIT IV and/or their successors and assigns.
 
                                       245
<PAGE>   254
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              -----
<S>                                                           <C>
EOP OPERATING LIMITED PARTNERSHIP
Pro Forma Condensed Combined Financial Statements
  (Unaudited) (Post-Merger):
  Basis of Presentation to Unaudited Pro Forma Combined
     Balance Sheet..........................................    F-4
  Pro Forma Condensed Combined Balance Sheet as of September
     30, 1997...............................................    F-5
  Notes to Pro Forma Condensed Combined Balance Sheet.......    F-6
  Basis of Presentation to Unaudited Pro Forma Combined
     Statement of Operations................................    F-8
  Pro Forma Condensed Combined Statement of Operations for
     the nine months ended September 30, 1997...............    F-9
  Pro Forma Condensed Combined Statement of Operations for
     the year ended December 31, 1996.......................   F-10
  Notes to Pro Forma Condensed Combined Statement of
     Operations.............................................   F-11
Pre-Merger Pro Forma Condensed Combined Financial Statements
  (Unaudited):
  Basis of Presentation to Unaudited Pre-Merger Pro Forma
     Condensed Combined Balance Sheet.......................   F-12
  Pre-Merger Pro Forma Condensed Combined Balance Sheet as
     of September 30, 1997..................................   F-13
  Pre-Merger Pro Forma Condensed Combined Statement of
     Operations for the nine months ended September 30,
     1997...................................................   F-14
  Pre-Merger Pro Forma Condensed Combined Statement of
     Operations for the year ended December 31, 1996........   F-15
  Notes to Pre-Merger Pro Forma Condensed Combined Financial
     Statements.............................................   F-16
Historical Consolidated and Combined Financial Statements
  (Unaudited)
     Consolidated and Combined Balance Sheets of EOP
      Operating Limited Partnership and Equity Office
      Predecessors as of September 30, 1997 and December 31,
      1996..................................................   F-22
     Consolidated Statement of Operations of EOP Operating
      Limited Partnership for the period from July 11, 1997
      to September 30, 1997 and the Combined Statements of
      Operations of Equity Office Predecessors for the
      period from July 1, 1997 to July 10, 1997 and the
      three months ended September 30, 1996.................   F-23
     Consolidated Statement of Operations of EOP Operating
      Limited Partnership for the period from July 11, 1997
      to September 30, 1997 and the Combined Statements of
      Operations of Equity Office Predecessors for the
      period from January 1, 1997 to July 10, 1997 and the
      nine months ended September 30, 1996..................   F-24
     Consolidated Statement of Cash Flows of EOP Operating
      Limited Partnership for the period from July 11, 1997
      to September 30, 1997 and the Combined Statements of
      Cash Flows of Equity Office Predecessors for the
      period from January 1, 1997 to July 10, 1997 and the
      nine months ended September 30, 1996..................   F-25
     Notes to Consolidated and Combined Financial
      Statements............................................   F-26
 
EQUITY OFFICE PREDECESSORS
  Report of Independent Auditors............................   F-37
  Combined Balance Sheets as of December 31, 1996 and
     1995...................................................   F-38
  Combined Statements of Operations for the years ended
     December 31, 1996, 1995 and 1994.......................   F-39
  Combined Statements of Owners' Equity for the years ended
     December 31, 1996, 1995 and 1994.......................   F-40
  Combined Statements of Cash Flows for the years ended
     December 31, 1996, 1995 and 1994.......................   F-41
  Notes to Combined Financial Statements....................   F-42
  Schedule III -- Real Estate and Accumulated Depreciation
     as of December 31, 1996................................   F-55
</TABLE>
 
                                       F-1
<PAGE>   255
<TABLE>
<CAPTION>
                                                              PAGE
                                                              -----
<S>                                                           <C>
177 BROAD STREET
  Report of Independent Auditors............................   F-58
  Statement of Revenue and Certain Expenses for the year
     ended December 31, 1996................................   F-59
  Notes to Statement of Revenue and Certain Expenses........   F-60
 
PRESTON COMMONS
  Report of Independent Auditors............................   F-61
  Statement of Revenue and Certain Expenses for the year
     ended December 31, 1996................................   F-62
  Notes to Statement of Revenue and Certain Expenses........   F-63
 
OAKBROOK TERRACE TOWER
  Report of Independent Auditors............................   F-64
  Statements of Revenue and Certain Expenses for the three
     months ended March 31, 1997 and the year ended December
     31, 1996...............................................   F-65
  Notes to Statements of Revenue and Certain Expenses.......   F-66
 
ONE MARITIME PLAZA
  Report of Independent Auditors............................   F-67
  Statements of Revenue and Certain Expenses for the three
     months ended
     March 31, 1997 and the year ended December 31, 1996....   F-68
  Notes to Statements of Revenue and Certain Expenses.......   F-69
 
201 MISSION STREET
  Report of Independent Auditors............................   F-70
  Statements of Revenue and Certain Expenses for the three
     months ended March 31, 1997 and the year ended December
     31, 1996...............................................   F-71
  Notes to Statements of Revenue and Certain Expenses.......   F-72
 
30 N. LASALLE
  Report of Independent Auditors............................   F-73
  Statements of Revenue and Certain Expenses for the three
     months ended March 31, 1997 and the year ended December
     31, 1996...............................................   F-74
  Notes to Statements of Revenue and Certain Expenses.......   F-75
 
COLUMBUS AMERICA PROPERTIES
  Report of Independent Auditors............................   F-76
  Combined Statements of Revenue and Certain Expenses for
     the period from January 1, 1997 to July 31, 1997 and
     the year ended December 31, 1996.......................   F-77
  Notes to Combined Statements of Revenue and Certain
     Expenses...............................................   F-78
 
PRUDENTIAL PROPERTIES
  Report of Independent Auditors............................   F-80
  Combined Statements of Revenue and Certain Expenses for
     the period from January 1, 1997 to August 31, 1997 and
     the year ended December 31, 1996.......................   F-81
  Notes to Combined Statements of Revenue and Certain
     Expenses...............................................   F-82
</TABLE>
 
                                       F-2
<PAGE>   256
<TABLE>
<CAPTION>
                                                              PAGE
                                                              -----
<S>                                                           <C>
550 SOUTH HOPE STREET
  Report of Independent Auditors............................   F-83
  Statements of Revenue and Certain Expenses for the period
     from April 1, 1997 to July 31, 1997 and the year ended
     March 31, 1997.........................................   F-84
  Notes to Statements of Revenue and Certain Expenses.......   F-85
 
ACORN PROPERTIES
  Report of Independent Auditors............................   F-86
  Combined Statements of Revenue and Certain Expenses for
     the period from January 1, 1997 to July 31, 1997 and
     the year ended December 31, 1996.......................   F-87
  Notes to Combined Statements of Revenue and Certain
     Expenses...............................................   F-88
 
10 & 30 SOUTH WACKER DRIVE
  Report of Independent Auditors............................   F-90
  Combined Statements of Revenue and Certain Expenses for
     the period from January 1, 1997 to July 31, 1997 and
     the year ended December 31, 1996.......................   F-91
  Notes to Combined Statements of Revenue and Certain
     Expenses...............................................   F-92
 
ONE LAFAYETTE CENTRE
  Report of Independent Auditors............................   F-93
  Statements of Revenue and Certain Expenses for the period
     from January 1, 1997 to July 31, 1997 and the year
     ended December 31, 1996................................   F-94
  Notes to Statements of Revenue and Certain Expenses.......   F-95
 
PPM PROPERTIES
  Report of Independent Auditors............................   F-96
  Combined Statements of Revenue and Certain Expenses for
     the period from January 1, 1997 to August 31, 1997 and
     the year ended December 31, 1996.......................   F-97
  Notes to Combined Statements of Revenue and Certain
     Expenses...............................................   F-98
 
BEACON PROPERTIES, L.P.
  Report of Independent Accountants.........................   F-99
  Consolidated Balance Sheets as of December 31, 1996 and
     1995...................................................  F-100
  Consolidated Statements of Operations for the years ended
     December 31, 1996 and 1995 and for the period May 26,
     1994 to December 31, 1994..............................  F-101
  Consolidated Statements of Partners' Capital for the
     period January 1, 1994 to December 31, 1996............  F-102
  Consolidated Statements of Cash Flows for the period
     January 1, 1994 to December 31, 1996...................  F-103
  Notes to Consolidated Financial Statements................  F-105
  Schedule III -- Real Estate and Accumulated Depreciation
     as of December 31, 1996................................  F-118
  Schedule IV -- Mortgage Loans on Real Estate as of
     December 31, 1996......................................  F-123
 
225 FRANKLIN STREET
  Report of Independent Accountants.........................  F-125
  Statements of Excess of Revenues Over Specific Operating
     Expenses for the three months ended March 31, 1997 and
     the year ended December 31, 1996.......................  F-126
  Notes to Statements of Excess Revenues Over Specific
     Operating Expenses.....................................  F-127
</TABLE>
 
                                       F-3
<PAGE>   257
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                  BASIS OF PRESENTATION TO UNAUDITED PRO FORMA
                             COMBINED BALANCE SHEET
                            AS OF SEPTEMBER 30, 1997
 
     The Unaudited Pro Forma Combined Balance Sheet gives effect to the proposed
Merger of EOP Partnership and Beacon Partnership as if the Merger and certain
other EOP Partnership and Beacon Partnership transactions which have either
occurred or are probable of occurring subsequent to September 30, 1997 had
occurred on September 30, 1997. The Unaudited Pro Forma Combined Balance Sheet
gives effect to the Merger under the purchase method of accounting in accordance
with Accounting Principles Board Opinion No. 16. In the opinion of management,
all significant adjustments necessary to reflect the effects of the Merger have
been made.
 
     The Unaudited Pro Forma Combined Balance Sheet is presented for comparative
purposes only and is not necessarily indicative of what the actual combined
position of EOP Partnership and Beacon Partnership would have been at September
30, 1997, nor does it purport to represent the future combined financial
position of EOP Partnership and Beacon Partnership. This Unaudited Pro Forma
Combined Balance Sheet should be read in conjunction with, and is qualified in
its entirety by, the historical financial statements and notes thereto and the
pre-Merger pro forma combined balance sheet at September 30, 1997 of EOP
Partnership included elsewhere herein, and the historical financial statements
and notes thereto and the pre-Merger pro forma combined balance sheet at
September 30, 1997 of Beacon Partnership incorporated herein by reference.
 
                                       F-4
<PAGE>   258
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                   PRO FORMA CONDENSED COMBINED BALANCE SHEET
                               SEPTEMBER 30, 1997
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                        EOP OPERATING                                               EOP OPERATING
                                     LIMITED PARTNERSHIP     BEACON PARTNERSHIP      MERGER      LIMITED PARTNERSHIP
                                     PRE-MERGER PRO FORMA   PRE-MERGER PRO FORMA   ADJUSTMENTS        PRO FORMA
                                     --------------------   --------------------   -----------   -------------------
                                             (A)                    (B)                (C)
<S>                                  <C>                    <C>                    <C>           <C>
ASSETS
  Investment in real estate, net...       $6,286,640             $2,459,465        $1,553,763(D)     $10,299,868
  Cash and cash equivalents........            4,393                  9,798               988(E)          15,179
  Investment in unconsolidated
    joint ventures.................           93,826                 50,472                --            144,298
  Other assets.....................          159,313                147,710           (46,203)(F)        260,820
                                          ----------             ----------        ----------        -----------
         TOTAL ASSETS..............       $6,544,172             $2,667,445        $1,508,548        $10,720,165
                                          ==========             ==========        ==========        ===========
LIABILITIES AND PARTNERS' CAPITAL
  Mortgage debt....................       $1,106,370             $  618,698        $   (6,000)(G)    $ 1,719,068
  Notes payable....................        1,399,218                407,017                --          1,806,235
  Other liabilities................          187,012                 74,795           (24,052)(G)        237,755
                                          ----------             ----------        ----------        -----------
         TOTAL LIABILITIES.........        2,692,600              1,100,510           (30,052)         3,763,058
  Minority interest in partially
    owned properties...............           28,118                     --                --             28,118
  Partners' capital................        3,823,454              1,566,935         1,538,600(H)       6,728,989
                                          ----------             ----------        ----------        -----------
         TOTAL LIABILITIES AND
           PARTNERS' CAPITAL.......       $6,544,172             $2,667,445        $1,508,548        $10,720,165
                                          ==========             ==========        ==========        ===========
</TABLE>
 
                                       F-5
<PAGE>   259
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
              NOTES TO PRO FORMA CONDENSED COMBINED BALANCE SHEET
                               SEPTEMBER 30, 1997
                                  (UNAUDITED)
 
     (A) See EOP Partnership's Pre-Merger Pro Forma Balance Sheet as of
September 30, 1997, included elsewhere herein.
 
     (B) See the Beacon Partnership Form 8-K dated November 14, 1997 (see
"Incorporation of Certain Information by Reference", included elsewhere herein).
 
     (C) Represents adjustments to record the Merger between EOP Partnership and
Beacon Partnership. The Merger will be accounted for using the purchase method
of accounting, based upon the assumed purchase price of $4,269,205,200 assuming
a market value of $31.00 per Unit of EOP Partnership's Units, as follows:
 
<TABLE>
<CAPTION>
<S>                                                         <C>
Issuance of 93.73 million EOP Partnership Units based on the
  1.4063 exchange rate, in exchange for 66.65 million Beacon
  Partnership Units (including 3.44 million Beacon
  Partnership Units related to the exercise of Beacon
  options anticipated to occur immediately prior to the
  Merger)...................................................  $2,905,604,200
Issuance of $200 million of preferred units to EOP related
  to exchange of Beacon preferred shares....................     200,000,000
Assumption of mortgage debt and other liabilities of Beacon
  Partnership...............................................   1,100,933,000
Adjustment to mortgage debt and other liabilities of Beacon
  Partnership to market value (see Note G)..................     (30,052,000)
Merger costs (see calculation below)........................      92,720,000
                                                              --------------
                                                              $4,269,205,200
                                                              ==============
</TABLE>
 
     The following is a calculation of the estimated fees and other expenses
related to the Merger:
 
<TABLE>
<CAPTION>
<S>                                                           <C>
Employee termination costs..................................  $   71,000,000
Debt assumption fees........................................       4,100,000
Transfer taxes..............................................       3,500,000
Advisory fees...............................................       4,500,000
Legal and accounting fees...................................       5,500,000
Other, including printing and filing costs..................       4,120,000
                                                              --------------
                                                              $   92,720,000
                                                              ==============
</TABLE>
 
                                       F-6
<PAGE>   260
 
     (D) Represents the estimated increase in Beacon Partnership's investment in
real estate, net, based upon EOP Partnership's purchase price as adjusted to
reflect the allocation to other tangible assets of Beacon Partnership being
acquired:
 
<TABLE>
<S>                                                           <C>
Purchase price (see Note C).................................  $4,269,205,200
Less: Historical basis of Beacon Partnership's net assets
  acquired:
  Rental property, net......................................   2,459,465,000
  Cash and cash equivalents, including $93.7 million
     received in exchange for the units that will be issued
     to Beacon upon the exercise of options related to 3.44
     million Beacon Common Shares anticipated to occur
     immediately prior to the Merger........................     103,509,900
  Investment in unconsolidated joint ventures...............      50,416,000
  Other assets, less write-off of deferred rents receivable
     of $27.0 million and deferred financing and leasing
     costs of $19.2 million (see Note F)....................     102,051,000
                                                              --------------
Subtotal....................................................   2,715,441,900
                                                              --------------
Step-up to record fair value of Beacon Partnership's
  investment in real estate, net............................  $1,553,763,300
                                                              ==============
</TABLE>
 
     (E) To record the net increase in cash from the following transactions:
 
<TABLE>
<S>                                                           <C>
Cash received in exchange for units issued to Beacon
  anticipated to occur upon exercise of Beacon options (see
  Note D)...................................................  $ 93,707,900
Transaction costs associated with the Merger (see Note C)...   (92,720,000)
                                                              ------------
     Net increase in cash...................................  $    987,900
                                                              ============
</TABLE>
 
     (F) To eliminate Beacon Partnership's deferred rents receivable of $27.0
million which arose from the historical straight-lining of rents, and Beacon
Partnership's deferred financing and leasing costs of $19.2 million written-off
as a result of the Merger.
 
     (G) To adjust Beacon Partnership's mortgage debt and other liabilities to
market value.
 
     (H) To reflect the net increase in partners' capital associated with the
Merger, as follows:
 
<TABLE>
<S>                                                           <C>
Issuance of 93.73 million EOP Partnership Units based on the
  1.4063 exchange rate, in exchange for 66.65 million Beacon
  Partnership Units (including 3.44 million Beacon
  Partnership Units related to the exercise of Beacon
  options anticipated to occur immediately prior to the
  Merger)...................................................  $ 2,905,535,200
Less: Total historical partners' capital of Beacon
  Partnership...............................................   (1,366,935,000)
                                                              ---------------
Net increase to partners' capital...........................  $ 1,538,600,200
                                                              ===============
</TABLE>
 
                                       F-7
<PAGE>   261
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                  BASIS OF PRESENTATION TO UNAUDITED PRO FORMA
                       COMBINED STATEMENTS OF OPERATIONS
  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND THE YEAR ENDED DECEMBER 31,
                                      1996
 
     The Unaudited Pro Forma Combined Statements of Operations for the nine
months ended September 30, 1997 and the year ended December 31, 1996 are
presented as if the Merger and certain other EOP Partnership and Beacon
Partnership transactions which have either occurred or are probable or occurring
subsequent to September 30, 1997 had occurred on January 1, 1997 and January 1,
1996, respectively. The Unaudited Pro Forma Combined Statements of Operations
give effect to the Merger under the purchase method of accounting in accordance
with Accounting Principles Board Opinion No. 16, and the combined entity
qualifying as a REIT, distributing at least 95% of its taxable income, and
therefore, incurring no federal income tax liability for the respective periods.
In the opinion of management, all significant adjustments necessary to reflect
the effects of these transactions have been made.
 
     The Unaudited Pro Forma Combined Statements of Operations are presented for
comparative purposes only and are not necessarily indicative of what the actual
combined results of EOP Partnership and Beacon Partnership would have been for
the nine months ended September 30, 1997 and the year ended December 31, 1996,
respectively, nor does it purport to be indicative of the results of operations
for future periods. The Unaudited Pro Forma Combined Statements of Operations
should be read in conjunction with, and are qualified in their entirety by, the
respective historical financial statements and notes thereto of EOP Partnership
and Beacon Partnership included elsewhere herein, and the Pre-Merger Pro Forma
Statements of Operations for the nine months ended September 30, 1997 and the
year ended December 31, 1997 of EOP Partnership included elsewhere herein and of
Beacon Partnership incorporated herein by reference.
 
                                       F-8
<PAGE>   262
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
              PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                    EOP OPERATING                                               EOP OPERATING
                                 LIMITED PARTNERSHIP     BEACON PARTNERSHIP      MERGER      LIMITED PARTNERSHIP
                                 PRE-MERGER PRO FORMA   PRE-MERGER PRO FORMA   ADJUSTMENTS        PRO FORMA
                                 --------------------   --------------------   -----------   -------------------
                                         (I)                    (J)
<S>                              <C>                    <C>                    <C>           <C>
Revenues:
  Rental.......................        $511,834               $271,273          $  1,412(K)      $  784,519
  Tenant reimbursements........         105,746                 38,164                --            143,910
  Parking......................          43,430                     --                --             43,430
  Other........................          10,241                 11,039                --             21,280
  Management fees..............           3,841                  2,445                --              6,286
  Interest.....................          12,777                  7,153                --             19,930
                                       --------               --------          --------         ----------
  Total revenues...............         687,869                330,074             1,412          1,019,355
                                       --------               --------          --------         ----------
Expenses:
  Property operating...........         258,028                104,285                --            362,313
  Interest.....................         139,201                 53,831                --            193,032
  Depreciation and
    amortization...............         117,114                 61,690             6,537(L)         185,341
  General and administrative...          24,856                 29,717           (15,000)(M)         39,573
                                       --------               --------          --------         ----------
                                        539,199                249,523            (8,463)           780,259
                                       --------               --------          --------         ----------
Income before allocation to
  minority interests, income
  from investment in
  unconsolidated joint
  ventures, gain on sale of
  real estate and extraordinary
  items........................         148,670                 80,551             9,875            239,096
Discontinued operations:
  Loss from operations --
    Construction Company.......              --                 (2,263)               --             (2,263)
Minority interests:
  Partially owned properties...          (1,233)                    --                --             (1,233)
Income from investment in
  unconsolidated joint
  ventures.....................           4,431                  4,602                --              9,033
Gain on sale of real estate....              --                     --                --                 --
Preferred dividends............              --                (13,470)               --            (13,470)
                                       --------               --------          --------         ----------
Income before extraordinary
  items........................         151,868                 69,420             9,875            231,163
Extraordinary items............         (12,929)                    --                              (12,929)
                                       --------               --------          --------         ----------
Net income.....................        $138,939               $ 69,420          $  9,875         $  218,234
                                       ========               ========          ========         ==========
Net income per Unit............        $   0.77(N)                                               $     0.80(N)
                                       ========                                                  ==========
Weighted average Units
  outstanding..................         179,391                                                     273,120
                                       ========                                                  ==========
</TABLE>
 
                                       F-9
<PAGE>   263
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
              PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1996
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                  EOP OPERATING
                                     LIMITED                                                       EOP OPERATING
                              PARTNERSHIP PRE-MERGER    BEACON PARTNERSHIP      MERGER                LIMITED
                                    PRO FORMA          PRE-MERGER PRO FORMA   ADJUSTMENTS      PARTNERSHIP PRO FORMA
                              ----------------------   --------------------   -----------      ---------------------
                                       (I)                     (J)
<S>                           <C>                      <C>                    <C>              <C>
Revenues:
  Rental....................         $631,276                $332,309          $  3,750(K)           $967,335
  Tenant reimbursements.....          120,436                  46,885                --               167,321
  Parking...................           54,314                      --                --                54,314
  Other.....................           24,552                  18,026                --                42,578
  Management fees...........            5,120                   3,005                --                 8,125
  Interest..................           12,767                   8,376                --                21,143
                                     --------                --------          --------              --------
                                      848,465                 408,601             3,750             1,260,816
                                     --------                --------          --------              --------
Expenses
  Property operating........          330,057                 132,230                --               462,287
  Interest..................          177,733                  73,888                --               251,621
  Depreciation and
     amortization...........          154,069                  78,745            10,085(L)            242,899
  General and
     administrative.........           25,545                  27,099           (20,000)(M)            32,644
                                     --------                --------          --------              --------
                                      687,404                 311,962            (9,915)              989,451
                                     --------                --------          --------              --------
Income before allocation to
  minority interests, income
  from investment in
  unconsolidated joint
  ventures, gain on sale of
  real estate and
  extraordinary items.......          161,061                  96,639            13,665               271,365
Discontinued operations:
  Loss from operations --
     Construction Company...               --                  (2,609)               --                (2,609)
  Loss on sale --
     Construction Company...               --                    (249)               --                  (249)
Minority interests:
  Partially owned
     properties.............           (2,142)                     --                --                (2,142)
Income from investment in
  unconsolidated joint
  ventures..................            4,725                   4,539                --                 9,264
Gain on sale of real
  estate....................            5,338                  16,505                --                21,843
Preferred dividends.........               --                 (17,960)               --               (17,960)
                                     --------                --------          --------              --------
Income before extraordinary
  items.....................          168,982                  96,865            13,665               279,512
Extraordinary items.........               --                      --                --                    --
                                     --------                --------          --------              --------
Net income..................         $168,982                $ 96,865          $ 13,665              $279,512
                                     ========                ========          ========              ========
Net income per Unit.........         $   0.94(N)                                                     $   1.02(N)
                                     ========                                                        ========
Weighted average Units
  outstanding...............          179,393                                                         273,120
                                     ========                                                        ========
</TABLE>
 
                                      F-10
<PAGE>   264
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
         NOTES TO PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997
                      AND THE YEAR ENDED DECEMBER 31, 1996
                                  (UNAUDITED)
 
     (I) See EOP Partnership's Pre-Merger Pro Forma Statement of Operations for
the nine months ended September 30, 1997 and the year ended December 31, 1996
included elsewhere herein.
 
     (J) See the Beacon Partnership Form 8-K dated November 14, 1997 (see
"Incorporation of Certain Information by Reference", herein).
 
     (K) To reflect the adjustment for the straight-line effect of scheduled
rent increases, assuming the Merger closed on January 1, 1997 and January 1,
1996, respectively, for the pro forma condensed combined statement of operations
for the nine months ended September 30, 1997 and the year ended December 31,
1996.
 
     (L) To reflect the depreciation expense related to the adjustment to record
the net equity value of the investment in real estate on a straight-line basis
and amortization of the mark-to-market adjustment of Beacon Partnership's
mortgage debt for the nine months ended September 30, 1997 and the year ended
December 31, 1996 associated with the Merger, as follows:
 
<TABLE>
<CAPTION>
                                                       FOR THE               FOR THE
                                                  NINE MONTHS ENDED        YEAR ENDED
                                                  SEPTEMBER 30, 1997    DECEMBER 31, 1996
                                                  ------------------    -----------------
<S>                                               <C>                   <C>
Beacon Partnership Pre-Merger Pro Forma
  investment in real estate, net..............      $2,459,465,000       $2,459,465,000
Adjustment to the basis of the investment in
  real estate (see Note D)....................       1,553,763,300        1,553,763,300
                                                    --------------       --------------
     Total investment in real estate,
       post-Merger............................       4,013,228,300        4,013,228,300
     Less: Portion allocated to land,
       estimated to be 10%....................        (401,322,800)        (401,322,800)
                                                    --------------       --------------
Pro Forma depreciable basis of Beacon
  Partnership's investment in real estate,
  net.........................................      $3,611,905,500       $3,611,905,500
                                                    ==============       ==============
Depreciation expense based on an estimated
  useful life of 40 years.....................      $   67,723,200       $   90,297,600
Beacon Partnership Pre-Merger pro forma
  depreciation expense........................          61,701,000           80,844,000
                                                    --------------       --------------
Adjustment to depreciation expense............           6,022,200            9,453,600
Amortization of mark to market adjustment of
  Beacon Partnership's mortgage debt..........             514,300              631,600
                                                    --------------       --------------
     Total adjustment to depreciation and
       amortization...........................      $    6,536,500       $   10,085,200
                                                    ==============       ==============
</TABLE>
 
     (M) To reflect the anticipated reduction of general and administrative
expenses as a result of the Merger.
 
     (N) Pre-Merger pro forma net income per unit is based upon 179.4 million
units assumed to be outstanding upon acquisition of the New Acquisitions and the
issuance of units to the seller of the Prudential Properties and the Private
Equity Offering as described in the pre-Merger pro forma financial statements
for EOP Partnership appearing elsewhere herein. Post-Merger net income per unit
is based upon 273.1 million units assumed to be outstanding after the Merger.
 
                                      F-11
<PAGE>   265
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
          PRE-MERGER PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
           AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND
                      FOR THE YEAR ENDED DECEMBER 31, 1996
                                  (UNAUDITED)
 
     The accompanying Unaudited Pro Forma Condensed Combined Balance Sheet as of
September 30, 1997 reflects the following transactions which all occurred or are
expected to occur subsequent to September 30, 1997: (a) the acquisition of 25
office properties and one parking facility; (b) the issuance of 9.7 million EOP
Partnership Units; (c) draws on the $1.5 billion Credit Facility to fund
acquisitions and repay mortgage indebtedness; and (d) the acquisition of a 50%
interest in the mortgage note securing the 1325 Avenue of the Americas property.
 
     The accompanying Unaudited Pro Forma Condensed Combined Statement of
Operations for the nine months ended September 30, 1997 reflects the following
transactions as if they had occurred on January 1, 1997: (a) the acquisition of
30 office properties and six parking facilities acquired between January 1, 1997
and October 17, 1997, the probable acquisition of six office properties and one
parking facility and the disposition of two office properties; (b) the $180
million private debt offering which occurred on September 3, 1997; (c) the
Consolidation and the Offering which closed on July 11, 1997 and the decrease in
interest expense resulting from the use of the net proceeds for the repayment of
mortgage debt; (d) the net increase in interest expense from draws on the $1.5
billion Credit Facility used to refinance existing mortgage debt; and (e)
interest income from the 50% interest in the mortgage note securing the 1325
Avenue of the Americas property.
 
     The accompanying Unaudited Pro Forma Condensed Combined Statement of
Operations for the year ended December 31, 1996 reflects the following
transactions as if they had occurred on January 1, 1996: (a) the acquisition of
40 office properties and 13 parking facilities acquired between January 1, 1997
and October 17, 1997, the probable acquisition of six office properties and one
parking facility and the disposition of two office properties; (b) the $180
million private debt offering which occurred on September 3, 1997; (c) the
Consolidation and the Offering and the decrease in interest expense resulting
from the use of the net proceeds for the repayment of mortgage debt; (d) the net
increase in interest expense from draws on the $1.5 billion Credit Facility used
to refinance existing mortgage debt; and (e) interest income from the 50%
interest in the mortgage note securing the 1325 Avenue of the Americas property.
 
     The accompanying unaudited pro forma condensed combined financial
statements have been prepared by management of EOP and do not purport to be
indicative of the results which would actually have been obtained had the
transactions described above been completed on the dates indicated or which may
be obtained in the future. The pro forma condensed combined financial statements
should be read in conjunction with the accompanying notes to the pro forma
condensed combined financial statements, the combined financial statements of
Equity Office Predecessors, EOP Partnership's financial statements for the nine
month period ended September 30, 1997 and the statements of revenue and certain
expenses for certain of the properties acquired by the EOP Partnership and
Equity Office Predecessors all included elsewhere herein.
 
                                      F-12
<PAGE>   266
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
             PRE-MERGER PRO FORMA CONDENSED COMBINED BALANCE SHEET
                               SEPTEMBER 30, 1997
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                      EOP OPERATING
                                                                                                         LIMITED
                                           EOP OPERATING                                               PARTNERSHIP
                                              LIMITED          NEW          UNIT        OTHER          PRE-MERGER
                                            PARTNERSHIP    ACQUISITIONS   ISSUANCES    ACTIVITY         PRO FORMA
                                           -------------   ------------   ---------    --------       -------------
                                                               (A)           (B)
<S>                                        <C>             <C>            <C>         <C>             <C>
ASSETS
Investment in real estate, net...........   $5,000,159     $ 1,286,481    $     --    $       --       $6,286,640
Cash and cash equivalents................      132,649      (1,144,942)    273,950       742,736(C)         4,393
Rents and other receivables..............       16,190              --          --            --           16,190
Escrow deposits and restricted cash......       42,966              --          --            --           42,966
Investment in mortgage notes.............           --              --          --        25,150(D)        25,150
Investment in unconsolidated joint
  ventures...............................       93,826              --          --            --           93,826
Other assets.............................       70,132              --          --         4,875(E)        75,007
                                            ----------     -----------    --------    ----------       ----------
    TOTAL ASSETS.........................   $5,355,922     $   141,539    $273,950    $  772,761       $6,544,172
                                            ==========     ===========    ========    ==========       ==========
LIABILITIES AND PARTNERS' CAPITAL
Mortgage debt............................   $1,325,333     $    14,749    $     --    $ (233,712)(F)   $1,106,370
Notes Payable............................      180,000              --          --            --          180,000
Revolving line of credit/term loan.......      211,125              --          --     1,008,093(G)     1,219,218
Distribution payable.....................       42,964              --          --            --           42,964
Other liabilities........................      132,748          11,300          --            --          144,048
                                            ----------     -----------    --------    ----------       ----------
    TOTAL LIABILITIES....................    1,892,170          26,049          --       774,381        2,692,600
Minority interests:
  Partially owned properties.............       28,118              --          --            --           28,118
Partners' capital........................    3,435,634         115,490     273,950        (1,620)(H)    3,823,454
                                            ----------     -----------    --------    ----------       ----------
    TOTAL LIABILITIES AND PARTNERS'
      CAPITAL............................   $5,355,922     $   141,539    $273,950    $  772,761       $6,544,172
                                            ==========     ===========    ========    ==========       ==========
</TABLE>
 
                                      F-13
<PAGE>   267
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
        PRE-MERGER PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997
                                  (UNAUDITED)
                                 (IN THOUSANDS)
<TABLE>
<CAPTION>
 
                                                      EOP
                                                   OPERATING       1997
                                                    LIMITED      ACQUIRED                   FINANCING      CONSOLIDATION
                                                  PARTNERSHIP   PROPERTIES   DISPOSITIONS   ACTIVITY         ACTIVITY
                                                  -----------   ----------   ------------   ---------      -------------
                                                      (I)          (J)           (K)
<S>                                               <C>           <C>          <C>            <C>            <C>
Revenues:
  Rental.......................................    $381,108      $17,194       $ (2,558)     $    --          $ 9,716(M)
  Tenant reimbursements........................      66,855        6,320            (62)          --               --
  Parking......................................      33,744          198           (573)          --               --
  Other........................................       7,600          412            (26)          --               --
  Fees from noncombined affiliates.............       3,841           --             --           --               --
  Interest.....................................      10,524           65             --           --               --
                                                   --------      -------       --------      -------          -------
      Total revenues...........................     503,672       24,189         (3,219)          --            9,716
                                                   --------      -------       --------      -------          -------
Expenses:
  Property operating...........................     190,170       11,034         (1,595)          --               --
  Interest.....................................     110,419           --            (36)       2,207(L)            --
  Depreciation.................................      80,166        3,391             --           --            1,205(N)
  Amortization.................................       5,884           --            (54)          --           (1,699)(O)
  General and administrative...................      23,056           --             --           --               --
                                                   --------      -------       --------      -------          -------
                                                    409,695       14,425         (1,685)       2,207             (494)
                                                   --------      -------       --------      -------          -------
Income before allocation to minority interests,
  income from investment in unconsolidated
  joint ventures, gain on sale of real estate
  and extraordinary items......................      93,977        9,764         (1,534)      (2,207)          10,210
Minority interests:
  Partially owned properties...................      (1,191)          --             --           --              (42)(P)
Income from investment in unconsolidated joint
  ventures.....................................       3,408        1,023             --           --               --
Gain on sale of real estate....................      12,510           --        (12,510)          --               --
                                                   --------      -------       --------      -------          -------
Income before extraordinary items..............     108,704       10,787        (14,044)      (2,207)          10,168
Extraordinary items............................     (13,204)          --            275           --               --
                                                   --------      -------       --------      -------          -------
Net income.....................................    $ 95,500      $10,787       $(13,769)     $(2,207)         $10,168
                                                   ========      =======       ========      =======          =======
Net income per unit............................
Weighted average units outstanding.............
 
<CAPTION>
                                                                                                               EOP OPERATING
                                                                                                                  LIMITED
                                                  OFFERING                                       OTHER          PARTNERSHIP
                                                  PRO FORMA                         NEW        FINANCING        PRE-MERGER
                                                 ADJUSTMENTS      SUBTOTAL      ACQUISITIONS   ACTIVITIES        PRO FORMA
                                                 -----------      --------      ------------   ----------      -------------
                                                                                    (J)
<S>                                              <C>              <C>           <C>            <C>             <C>
 
Revenues:
 
  Rental.......................................   $     --        $405,460        $106,374      $     --         $511,834
 
  Tenant reimbursements........................         --          73,113          32,633            --          105,746
 
  Parking......................................         --          33,369          10,061            --           43,430
 
  Other........................................         --           7,986           2,255            --           10,241
 
  Fees from noncombined affiliates.............         --           3,841              --            --            3,841
 
  Interest.....................................         --          10,589              --         2,188(S)        12,777
 
                                                  --------        --------        --------      --------         --------
 
      Total revenues...........................         --         534,358         151,323         2,188          687,869
 
                                                  --------        --------        --------      --------         --------
 
Expenses:
 
  Property operating...........................         --         199,609          58,419            --          258,028
 
  Interest.....................................    (25,343)(Q)      87,247          41,400        10,554(T)       139,201
 
  Depreciation.................................         --          84,762          24,080            --          108,842
 
  Amortization.................................         --           4,131              --         4,141(U)         8,272
 
  General and administrative...................      1,800(R)       24,856              --            --           24,856
 
                                                  --------        --------        --------      --------         --------
 
                                                   (23,543)        400,605         123,899        14,695          539,199
 
                                                  --------        --------        --------      --------         --------
 
Income before allocation to minority interests,
 
  income from investment in unconsolidated
 
  joint ventures, gain on sale of real estate
 
  and extraordinary items......................     23,543         133,753          27,424       (12,507)         148,670
 
Minority interests:
 
  Partially owned properties...................         --          (1,233)             --            --           (1,233)
 
Income from investment in unconsolidated joint
 
  ventures.....................................         --           4,431              --            --            4,431
 
Gain on sale of real estate....................         --              --              --            --               --
 
                                                  --------        --------        --------      --------         --------
 
Income before extraordinary items..............     23,543         136,951          27,424       (12,507)         151,868
 
Extraordinary items............................         --         (12,929)             --            --          (12,929)
 
                                                  --------        --------        --------      --------         --------
 
Net income.....................................   $ 23,543        $124,022        $ 27,424      $(12,507)        $138,939
 
                                                  ========        ========        ========      ========         ========
 
Net income per unit............................                   $   0.76(V)                                    $   0.77(V)
 
                                                                  ========                                       ========
 
Weighted average units outstanding.............                    163,556                                        179,393
 
                                                                  ========                                       ========
 
</TABLE>
 
                                      F-14
<PAGE>   268
 
                       EOP OPERATING LIMITED PARTNERSHIP
        PRE-MERGER PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1996
                                  (UNAUDITED)
                                 (IN THOUSANDS)
<TABLE>
<CAPTION>
 
                               EOP OPERATING      1996         1997
                                  LIMITED       ACQUIRED     ACQUIRED                          FINANCING         CONSOLIDATION
                                PARTNERSHIP    PROPERTIES   PROPERTIES      DISPOSITIONS        ACTIVITY           ACTIVITY
                               -------------   ----------   ----------      ------------       ---------         -------------
                                    (I)           (J)          (J)              (K)
<S>                            <C>             <C>          <C>             <C>            <C>                   <C>
Revenues:
  Rental.....................    $386,481       $53,340      $46,240          $(8,303)          $    --             $17,973(M)
  Tenant reimbursements......      62,036         9,967        6,889              (88)               --                  --
  Parking....................      27,253        13,518        1,074           (1,462)               --                  --
  Other......................      17,626         1,797        1,708              (99)               --                  --
  Fees from noncombined
    affiliates...............       5,120            --           --               --                --                  --
  Interest...................       9,608            --          249               (7)               --                  --
                                 --------       -------      -------          -------           -------             -------
                                  508,124        78,622       56,160           (9,959)               --              17,973
                                 --------       -------      -------          -------           -------             -------
Expenses
  Property operating.........     201,067        30,971       23,734           (5,046)               --                  --
  Interest...................     119,595        24,178           --             (956)            9,983(L)               --
  Depreciation...............      82,905        13,090       11,951           (1,941)               --               7,011(N)
  Amortization...............      13,332            --           --             (346)               --              (8,591)(O)
  General and
    administrative...........      23,145            --           --               --                --                  --
                                 --------       -------      -------          -------           -------             -------
                                  440,044        68,239       35,885           (8,289)            9,983              (1,580)
                                 --------       -------      -------          -------           -------             -------
Income before allocation to
  minority interests, income
  from investment in
  unconsolidated joint
  ventures, gain on sale of
  real estate and
  extraordinary items........      68,080        10,383       20,475           (1,670)           (9,983)             19,553
Minority interests:
  Partially owned
    properties...............      (2,086)           --           --               --                --                 (56)(P)
Income from investment in
  unconsolidated joint
  ventures...................       2,093            --        2,632               --                --                  --
Gain on sale of real
  estate.....................       5,338            --           --               --                --                  --
                                 --------       -------      -------          -------           -------             -------
Income before extraordinary
  items......................      73,425        10,383       23,107           (1,670)           (9,983)             19,497
Extraordinary items..........          --            --           --               --                --                  --
                                 --------       -------      -------          -------           -------             -------
Net income...................    $ 73,425       $10,383      $23,107          $(1,670)          $(9,983)            $19,497
                                 ========       =======      =======          =======           =======             =======
Net income per unit..........
Weighted average units
  outstanding................
 
<CAPTION>
                                OFFERING                                                       EOP OPERATING
                                   PRO                                            OTHER           LIMITED
                                  PORMA                           NEW           FINANCING       PARTNERSHIP
                               ADJUSTMENTS      SUBTOTAL      ACQUISITIONS      ACTIVITY         PRO FORMA
                               -----------      --------      ------------      ---------      -------------
                                                                  (J)
<S>                            <C>              <C>           <C>               <C>            <C>
Revenues:
  Rental.....................   $     --        $495,731        $135,545         $    --         $631,276
  Tenant reimbursements......         --          78,804          41,632              --          120,436
  Parking....................         --          40,383          13,931              --           54,314
  Other......................         --          21,032           3,520              --           24,552
  Fees from noncombined
    affiliates...............         --           5,120              --              --            5,120
  Interest...................         --           9,850              --           2,917(S)        12,767
                                --------        --------        --------         -------         --------
                                      --         650,920         194,628           2,917          848,465
                                --------        --------        --------         -------         --------
Expenses
  Property operating.........         --         250,726          79,331              --          330,057
  Interest...................    (43,041)(Q)     109,759          66,351           1,623(T)       177,733
  Depreciation...............         --         113,016          32,271              --          145,287
  Amortization...............         --           4,395              --           4,387(U)         8,782
  General and
    administrative...........      2,400(R)       25,545              --              --           25,545
                                --------        --------        --------         -------         --------
                                 (40,641)        503,441         177,953           6,010          687,404
                                --------        --------        --------         -------         --------
Income before allocation to
  minority interests, income
  from investment in
  unconsolidated joint
  ventures, gain on sale of
  real estate and
  extraordinary items........     40,641         147,479          16,675          (3,093)         161,061
Minority interests:
  Partially owned
    properties...............         --          (2,142)             --              --           (2,142)
Income from investment in
  unconsolidated joint
  ventures...................         --           4,725              --              --            4,725
Gain on sale of real
  estate.....................         --           5,338              --              --            5,338
                                --------        --------        --------         -------         --------
Income before extraordinary
  items......................     40,641         155,400          16,675          (3,093)         168,982
Extraordinary items..........         --              --              --              --               --
                                --------        --------        --------         -------         --------
Net income...................   $ 40,641        $155,400        $ 16,675         $(3,093)        $168,982
                                ========        ========        ========         =======         ========
Net income per unit..........                   $   0.95(V)                                      $   0.94(V)
                                                ========                                         ========
Weighted average units
  outstanding................                    163,556                                          179,393
                                                ========                                         ========
</TABLE>
 
                                      F-15
<PAGE>   269
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                       NOTES TO THE PRE-MERGER PRO FORMA
                    CONDENSED COMBINED FINANCIAL STATEMENTS
 
     (A) To reflect the following acquisitions (the "New Acquisitions"):
 
<TABLE>
<CAPTION>
                                                           LIABILITIES   VALUE OF OP
       PROPERTY          PURCHASE PRICE     CASH PAID        ASSUMED     UNITS ISSUED
       --------          --------------     ---------      -----------   ------------
<S>                      <C>              <C>              <C>           <C>
Prudential
  Properties...........  $  289,000,000   $  211,950,000   $ 6,000,000   $ 71,050,000
Acorn Properties.......     127,500,000       92,750,715    14,749,285     20,000,000
550 South Hope
  Street...............      99,500,000       99,500,000            --             --
10 & 30 South Wacker
  Drive................     462,000,000      462,000,000            --             --
One Lafayette Centre...      82,500,000       52,760,315     5,300,000     24,439,685
PPM Properties.........      92,831,000       92,831,000            --             --
Stanwix Parking
  Facility.............      17,850,000       17,850,000            --             --
LaSalle Office Plaza...      98,100,000       98,100,000            --             --
                         --------------   --------------   -----------   ------------
                         $1,286,481,000   $1,144,942,030   $26,049,285   $115,489,685
                         ==============   ==============   ===========   ============
</TABLE>
 
     (B) To reflect the following EOP Partnership Unit issues:
 
<TABLE>
<S>                                                           <C>
Private issuance of 6,666,667 EOP Partnership Units at
  $30.00 per EOP Partnership Unit...........................  $200,000,000
Issuance of 3,018,367 EOP Partnership Units at $24.50 per
  EOP Partnership Unit......................................    73,950,000
                                                              ------------
                                                              $273,950,000
                                                              ============
</TABLE>
 
     (C) To reflect net cash proceeds from the following transactions:
 
<TABLE>
<S>                                                           <C>
Proceeds from the $1.5 billion Credit Facility to fund
  acquisitions (see Note A).................................  $747,611,000
Payment of underwriting fees related to the $1.5 billion
  Credit Facility (see Note E)..............................    (4,875,000)
                                                              ------------
     Net cash proceeds......................................  $742,736,000
                                                              ============
</TABLE>
 
     (D) To reflect the investment in the mortgage note securing the 1325 Avenue
of the Americas property made in November, 1997. EOP Partnership owns a 50%
interest in the mortgage note which bears interest at LIBOR plus 6%.
 
     (E) To reflect the underwriting fee paid by the EOP Partnership pertaining
to the $1.5 billion Credit Facility. The underwriting fee will be amortized to
interest expense over the term of the $1.5 billion Credit Facility which is nine
months.
 
                                      F-16
<PAGE>   270
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                       NOTES TO THE PRE-MERGER PRO FORMA
              CONDENSED COMBINED FINANCIAL STATEMENTS -- CONTINUED
 
     (F) To reflect the mortgage debt repaid from draws on the $1.5 billion
Credit Facility and to write-off the mark-to-market adjustments for the
following properties recorded at the time of the Consolidation and the Offering
based on the outstanding principal balances as of September 30, 1997:
 
<TABLE>
<CAPTION>
                                                                              BALANCE AT
             PROPERTY                 INTEREST RATE        MATURITY DATE       9/30/97
             --------                 -------------        -------------      ----------
<S>                                 <C>                  <C>                 <C>
1601 Market.......................    LIBOR + 1.25%        June 30, 2001     $ 24,151,911
1620 L Street.....................        8.00%          February 4, 2000      21,085,736
9400 NCX..........................    LIBOR + 1.65%        May 10, 2001        14,217,800
Bank One Center...................     LIBOR + 1.1%       March 19, 1999       83,500,000
NationsBank.......................        8.00%          December 1, 2003      18,854,819
North Central Plaza...............    LIBOR + 1.75%       August 3, 1999       14,931,534
San Jacinto.......................    LIBOR + 1.125%     December 13, 1998     18,212,287
Sterling Plaza....................    LIBOR + 1.75%      December 8, 1998      15,627,529
The Quadrant......................  EURODOLLAR + 2.00%     May 31, 1999        18,000,000
Union Square......................  EURODOLLAR + 2.00%     May 31, 1999         6,750,000
                                                                             ------------
       Subtotal...................                                            235,331,616
Less: write-off of mark-to-market
  adjustments for debt repaid on
  San Jacinto, Nationsbank and
  Bank One Center.................                                             (1,620,000)
                                                                             ------------
                                                                             $233,711,616
                                                                             ============
</TABLE>
 
     (G) To record draws on the $1.5 billion Credit Facility which occurred or
are probable of occurring for the following:
 
<TABLE>
<S>                                                           <C>
Draws to fund acquisitions (see Note C).....................  $  747,611,000
Draws to repay mortgage debt (see Note F)...................     235,331,616
Draw to fund investment in mortgage note (see Note D).......      25,150,000
                                                              --------------
                                                              $1,008,092,616
                                                              ==============
</TABLE>
 
     (H) To reflect the net decrease in partners' capital due to the write-off
of mark-to-market adjustments on mortgage debt repaid with the $1.5 billion
Credit Facility (see Note D).
 
                                      F-17
<PAGE>   271
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                         NOTES TO PRE-MERGER PRO FORMA
                    CONDENSED COMBINED FINANCIAL STATEMENTS
                FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND
                        THE YEAR ENDED DECEMBER 31, 1996
 
                                  (UNAUDITED)
 
     (I) Represents the combined historical statements of operations of EOP
Partnership for the period from July 11, 1997 to September 30, 1997 and Equity
Office Predecessors for the period from January 1, 1997 to July 10, 1997 for the
Pro Forma Condensed Combined Statement of Operations for the nine months ended
September 30, 1997 and the Historical Statement of Operations of Equity Office
Predecessors for the Pro Forma Condensed Combined Statement of Operations for
the year ended December 31, 1996.
 
     (J) To reflect the operations and the depreciation expense for (a) the pro
forma condensed combined statement of operations for the nine months ended
September 30, 1997; for the period from January 1, 1997 through the earlier of
the date of acquisition or September 30, 1997, as applicable, for properties
acquired, or expected to be acquired, in 1997, and (b) the pro forma condensed
combined statement of operations for the year ended December 31, 1996; for the
period from January 1, 1996 through the date of acquisition for properties
acquired in 1996, or December 31, 1996 for the properties acquired, or expected
to be acquired, in 1997. Interest expense was also adjusted, where applicable,
to reflect nine months and a full year, for the nine months ended September 30,
1997 and the year ended December 31, 1996, respectively.
 
<TABLE>
<CAPTION>
                         PROPERTY                               DATE ACQUIRED       PERIOD REFERENCE
                         --------                               -------------       ----------------
<S>                                                           <C>                   <C>
1601 Market Street........................................    January 18, 1996             1
Promenade II..............................................    June 14, 1996                1
Two California Plaza......................................    August 23, 1996              1
BP Tower..................................................    September 4, 1996            1
SunTrust Center...........................................    September 18, 1996           1
Reston Town Center........................................    October 22, 1996             1
One Phoenix Plaza.........................................    December 4, 1996             1
Colonnade I...............................................    December 4, 1996             1
Boston Harbor Garage......................................    December 10, 1996            1
Milwaukee Center Parking Garage...........................    December 18, 1996            1
15th & Sansom Streets Garage..............................    December 27, 1996            1
1616 Chancellor Street Garage.............................    December 27, 1996            1
Juniper/Locusts Streets Garage............................    December 27, 1996            1
1616 Sansom Street Garage.................................    December 27, 1996            1
1111 Sansom Street Garage.................................    December 27, 1996            1
177 Broad Street..........................................    January 29, 1997             2
Biltmore Apartments.......................................    January 29, 1997             2
Preston Commons...........................................    March 21, 1997               2
Oakbrook Terrace Tower....................................    April 16, 1997               2
50% Interest in Civic Parking, L.L.C......................    April 16, 1997               2
One Maritime Plaza........................................    April 21, 1997               2
Smith Barney Tower........................................    April 29, 1997               2
201 Mission Street........................................    April 30, 1997               2
30 N. LaSalle.............................................    June 13, 1997                2
Adams-Wabash Parking Garage...............................    August 11, 1997              2
Columbus America Properties...............................    September 3, 1997            2
Prudential Properties.....................................    October 1, 1997              3
550 South Hope Street.....................................    October 6, 1997              3
10 & 30 South Wacker Drive................................    October 7, 1997              3
Acorn Properties..........................................    October 7, 1997              3
One Lafayette Centre......................................    October 17, 1997             3
PPM Properties............................................    Pending                      3
Stanwix Parking Facility..................................    Pending                      3
LaSalle Office Plaza......................................    Pending                      3
</TABLE>
 
                                      F-18
<PAGE>   272
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                         NOTES TO PRE-MERGER PRO FORMA
             CONDENSED COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
                FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND
                        THE YEAR ENDED DECEMBER 31, 1996
 
                                  (UNAUDITED)
 
Note 1:   Included in the Pro Forma Condensed Combined Statement of Operations
          for the year ended December 31, 1996, in the column entitled "1996
          Acquired Properties".
 
Note 2:  Included in the Pro Forma Condensed Combined Statement of Operations
         for the year ended December 31, 1996 and for the nine months ended
         September 30, 1997, in the column entitled "1997 Acquired Properties".
 
Note 3:  Included in the Pro Forma Condensed Combined Statement of Operations
         for the year ended December 31, 1996 and for the nine months ended
         September 30, 1997, in the column entitled "New Acquisitions". (See
         Note A).
 
     The depreciation adjustment of $3.4 million in the "1997 Acquired
Properties" column and $24.1 million in the "New Acquisitions" column in the
statement of operations for the nine months ended September 30, 1997, and the
depreciation adjustment of $13.1 million in the "1996 Acquired Properties"
column, $12.0 million in the "1997 Acquired Properties" column and $32.3 million
in the "New Acquisitions" column in the statement of operations for the year
ended December 31, 1996, are based on the cost to acquire the above listed
properties, assuming that 10% of the purchase price is allocated to land and the
depreciable lives are 40 years. Depreciation is computed using the straight-line
method.
 
     (K) To eliminate the operations of Barton Oaks Plaza II and 8383 Wilshire
for the nine months ended September 30, 1997 and the year ended December 31,
1996, which were sold in January and May 1997, respectively.
 
     (L) To reflect the additional interest expense on debt obtained in the nine
months ended September 30, 1997 on properties acquired before 1997 and to
reflect the private debt offering and paydown of the revolving credit facility
for the nine months ended September 30, 1997 and the year ended December 31,
1996.
 
     (M) To reflect the adjustment for the straight-line effect of scheduled
rent increase, assuming the Consolidation and the Offering closed on January 1,
1997 and 1996, respectively, for the pro forma condensed combined statement of
operations for the nine months ended September 30, 1997 and the year ended
December 31, 1996.
 
                                      F-19
<PAGE>   273
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                         NOTES TO PRE-MERGER PRO FORMA
             CONDENSED COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
                FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND
                        THE YEAR ENDED DECEMBER 31, 1996
 
                                  (UNAUDITED)
 
     (N) To reflect depreciation expense related to the adjustment to record the
net equity value of the investment in real estate for the nine months ended
September 30, 1997 and for the year ended December 31, 1996, on a straight-line
basis, as follows:
 
<TABLE>
<CAPTION>
                                            FOR THE NINE MONTHS ENDED   FOR THE YEAR ENDED
                                               SEPTEMBER 30, 1997       DECEMBER 31, 1996
                                            -------------------------   ------------------
<S>                                         <C>                         <C>
Historical investment in real estate
  before accumulated depreciation.........       $5,022,946,000           $5,022,946,000
Less: Portion allocated to land estimated
  to be 10%...............................         (502,294,600)            (502,294,600)
                                                 --------------           --------------
Depreciable basis.........................       $4,520,651,400           $4,520,651,400
                                                 ==============           ==============
Depreciation expense based on an estimated
  useful life of 40 years.................       $   84,762,214           $  113,016,285
Less: Historical depreciation expense
  recorded on the step-up amount..........           80,166,000               82,905,000
Pro forma depreciation expense on 1996
  Acquired Properties.....................                   --               13,090,000
Pro forma depreciation expense on 1997
  Acquired Properties.....................            3,391,000               11,951,000
Depreciation expense on disposed
  properties..............................                   --               (1,941,000)
                                                 --------------           --------------
Depreciation expense adjustment...........       $    1,205,214           $    7,011,285
                                                 ==============           ==============
</TABLE>
 
     (O) To eliminate the $5.9 million and $13.3 million of amortization
historically recognized as a result of the write-off of deferred loan costs,
lease acquisition costs and organization costs, net of the $4.1 million and $4.4
million amortization of the discount required to record the mortgage debt at
fair value recorded in connection with the Consolidation and Offering, and the
$0.1 million and $0.3 million of amortization relating to disposed properties
for the nine months ended September 30, 1997 and the year ended December 31,
1996.
 
                                      F-20
<PAGE>   274
 
                       EOP OPERATING LIMITED PARTNERSHIP
 
                         NOTES TO PRE-MERGER PRO FORMA
             CONDENSED COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
                FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND
                        THE YEAR ENDED DECEMBER 31, 1996
 
                                  (UNAUDITED)
 
     (P) To reflect the 5% economic interest that EOP Partnership does not own
in Equity Office Properties Management Corp. (the "Management Corp.").
 
<TABLE>
<CAPTION>
                                             FOR THE NINE MONTHS ENDED    FOR THE YEAR ENDED
                                                SEPTEMBER 30, 1997        DECEMBER 31, 1996
                                             -------------------------    ------------------
<S>                                          <C>                          <C>
Historical ownership interest in
  partially owned properties.............           $1,191,000                $2,086,000
                                                 -------------                ----------
Fees from noncombined affiliates.........            3,840,000                 5,120,000
Management Corp. expenses................            3,000,000                 4,000,000
                                                 -------------                ----------
Estimated Management Corp. net income....              840,000                 1,120,000
                                                 -------------                ----------
Minority interest 5% economic interest in
  the Management Corp....................               42,000                    56,000
                                                 -------------                ----------
Net income allocated to minority
  interests ownership in partially owned
  properties.............................           $1,233,000                $2,142,000
                                                 =============                ==========
</TABLE>
 
     (Q) To reflect the reduction of interest expense associated with the $15.0
million of mortgage debt on Denver Corporate Center Towers II and II repaid in
May 1997 and the $598.4 million repaid with net proceeds of the Offering and
cash held by Equity Office Predecessors.
 
     (R) To reflect additional general and administrative expenses expected to
be incurred as a result of reporting as a public company, as follows:
 
<TABLE>
<CAPTION>
                                             FOR THE NINE MONTHS ENDED    FOR THE YEAR ENDED
                                                SEPTEMBER 30, 1997        DECEMBER 31, 1996
                                             -------------------------    ------------------
<S>                                          <C>                          <C>
Directors and officers insurance.........           $  375,000                $  500,000
Printing and mailing.....................              375,000                   500,000
Trustees and directors fees..............              225,000                   300,000
Investor relations.......................              225,000                   300,000
Other....................................              600,000                   800,000
                                                 -------------                ----------
  Total..................................           $1,800,000                $2,400,000
                                                 =============                ==========
</TABLE>
 
     (S) To reflect interest income from the investment in the mortgage note
(see Note E).
 
     (T) To reflect the net increase in interest expense associated with the
$235.0 million of mortgage indebtedness repaid from draws on the $1.5 billion
Credit Facility (see Note F) and repayment of the line of credit balance of
$211.1 million.
 
     (U) To eliminate the $.7 and $.5 million of amortization expense recorded
on the mark-to-market adjustment on debt repaid from draws on the $1.5 billion
Credit Facility and the reflect amortization of $4.9 and $4.9 million related to
the underwriting fees associated with the $1.5 billion Credit Facility for the
nine months ended September 30, 1997 and the year ended December 31, 1996.
 
     (V) Net income per EOP Partnership Unit is based upon 163.6 million EOP
Partnership Units outstanding upon completion of the Consolidation and the
Offering. Pro forma net income per EOP Partnership Unit is based upon 179.4
million EOP Partnership Units assumed to be outstanding upon acquisition of the
New Acquisitions and the issuance of EOP Partnership Units.
 
                                      F-21
<PAGE>   275
 
          EOP OPERATING LIMITED PARTNERSHIP CONSOLIDATED BALANCE SHEET
             AND EQUITY OFFICE PREDECESSORS COMBINED BALANCE SHEET
 
<TABLE>
<CAPTION>
                                                                 EOP OPERATING       EQUITY OFFICE
                                                              LIMITED PARTNERSHIP    PREDECESSORS
                                                                 SEPTEMBER 30,       DECEMBER 31,
                                                                     1997                1996
                                                                  (UNAUDITED)         (UNAUDITED)
                                                              -------------------    -------------
                                                                        ($ IN THOUSANDS)
<S>                                                           <C>                    <C>
                           ASSETS
Investment in real estate...................................      $5,022,946           $3,549,708
Accumulated depreciation....................................         (22,787)            (257,893)
                                                                  ----------           ----------
                                                                   5,000,159            3,291,815
Cash and cash equivalents...................................         132,649              410,420
Tenant and other receivables (net of allowance for doubtful
  accounts of $774 and $55, respectively)...................           7,488                8,675
Deferred rent receivable....................................           8,702               49,986
Escrow deposits and restricted cash.........................          42,966               32,593
Investment in unconsolidated joint ventures.................          93,826               26,910
Deferred financing costs (net of accumulated amortization of
  $107 and $3,351, respectively)............................           1,232                8,372
Deferred leasing costs (net of accumulated amortization of
  $0 and $18,455, respectively).............................          19,648               62,593
Prepaid expenses and other assets...........................          49,252               21,201
                                                                  ----------           ----------
          TOTAL ASSETS......................................      $5,355,922           $3,912,565
                                                                  ==========           ==========
      LIABILITIES AND PARTNERS' CAPITAL/OWNERS' EQUITY
Mortgage debt...............................................      $1,325,333           $1,837,767
Unsecured notes.............................................         180,000                   --
Line of credit..............................................         211,125              127,125
Accounts payable and accrued expenses.......................          98,369               81,995
Due to affiliates...........................................           1,292                2,074
Distribution payable........................................          42,964               96,500
Other liabilities...........................................          33,087               29,022
                                                                  ----------           ----------
          TOTAL LIABILITIES.................................       1,892,170            2,174,483
                                                                  ----------           ----------
Commitments and contingencies (Note 15).....................              --                   --
Minority interests -- Partially Owned Properties............          28,118               11,080
                                                                  ----------           ----------
Partners' Capital/Owners' Equity............................       3,435,634            1,727,002
                                                                  ----------           ----------
TOTAL LIABILITIES AND PARTNERS' CAPITAL/OWNERS' EQUITY......      $5,355,922           $3,912,565
                                                                  ==========           ==========
</TABLE>
 
                            See accompanying notes.
 
                                      F-22
<PAGE>   276
 
     EOP OPERATING LIMITED PARTNERSHIP CONSOLIDATED STATEMENT OF OPERATIONS
        AND EQUITY OFFICE PREDECESSORS COMBINED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                            EQUITY OFFICE
                                                                            PREDECESSORS     EQUITY OFFICE
                                                        EOP OPERATING            FOR         PREDECESSORS
                                                     LIMITED PARTNERSHIP     THE PERIOD      FOR THE THREE
                                                     FOR THE PERIOD FROM        FROM         MONTHS ENDED
                                                      JULY 11, 1997 TO     JULY 1, 1997 TO   SEPTEMBER 30,
                                                     SEPTEMBER 30, 1997     JULY 10, 1997        1996
                                                     -------------------   ---------------   -------------
                                                                       ($ IN THOUSANDS)
<S>                                                  <C>                   <C>               <C>
Revenues:
  Rental...........................................     $    124,962           $14,410         $ 98,186
  Tenant reimbursements............................           23,614             2,985           16,103
  Parking..........................................           12,653             1,141            6,746
  Other............................................            1,061               269            1,848
  Fees from noncombined affiliates.................            1,331                70              886
  Interest.........................................              947               443            2,348
                                                        ------------           -------         --------
  Total revenues...................................          164,568            19,318          126,117
                                                        ------------           -------         --------
Expenses:
  Interest:
     Expense incurred..............................           25,793             4,180           33,540
     Amortization of deferred financing costs......            1,374               410            2,193
  Depreciation.....................................           22,787             4,718           20,912
  Amortization.....................................               --               497            2,556
  Real estate taxes................................           18,317             2,326           12,246
  Insurance........................................            1,255               245            1,344
  Repairs and maintenance..........................           19,651             2,412           18,418
  Property operating...............................           23,662             2,193           18,885
  General and administrative.......................            5,855             2,475            5,008
                                                        ------------           -------         --------
  Total expenses...................................          118,694            19,456          115,102
                                                        ------------           -------         --------
Income before allocation to minority interests,
  income from investment in unconsolidated joint
  ventures, and extraordinary items................           45,874              (138)          11,015
Minority interests -- Partially Owned Properties...             (279)              (33)            (468)
Income from unconsolidated joint ventures..........            1,426               (43)             477
                                                        ------------           -------         --------
Income before extraordinary items..................           47,021              (214)          11,024
Extraordinary items................................          (12,930)               --               --
                                                        ------------           -------         --------
Net income (loss)..................................     $     34,091           $  (214)        $ 11,024
                                                        ============           =======         ========
Net income per Unit:
  Income before extraordinary items................     $       0.29           $    --         $     --
  Extraordinary items..............................            (0.08)               --               --
                                                        ------------           -------         --------
Net income per Unit................................     $        .21           $    --         $     --
                                                        ============           =======         ========
Weighted average Units outstanding.................      164,146,710                --               --
                                                        ============           =======         ========
</TABLE>
 
                            See accompanying notes.
 
                                      F-23
<PAGE>   277
 
     EOP OPERATING LIMITED PARTNERSHIP CONSOLIDATED STATEMENT OF OPERATIONS
        AND EQUITY OFFICE PREDECESSORS COMBINED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                             EQUITY OFFICE
                                                     EOP OPERATING        EQUITY OFFICE      PREDECESSORS
                                                  LIMITED PARTNERSHIP    PREDECESSORS FOR    FOR THE NINE
                                                  FOR THE PERIOD FROM    THE PERIOD FROM     MONTHS ENDED
                                                   JULY 11, 1997 TO     JANUARY 1, 1997 TO   SEPTEMBER 30,
                                                  SEPTEMBER 30, 1997      JULY 10, 1997          1996
                                                  -------------------   ------------------   -------------
                                                                      ($ IN THOUSANDS)
<S>                                               <C>                   <C>                  <C>
Revenues:
  Rental........................................     $    124,962            $256,146          $275,156
  Tenant reimbursements.........................           23,614              43,241            43,239
  Parking.......................................           12,653              21,091            18,975
  Other.........................................            1,061               6,539             6,290
  Fees from noncombined affiliates..............            1,331               2,510             3,126
  Interest......................................              947               9,577             6,451
                                                     ------------            --------          --------
  Total revenues................................          164,568             339,104           353,237
                                                     ------------            --------          --------
Expenses:
  Interest:
     Expense incurred...........................           25,793              80,481            87,551
     Amortization of deferred financing costs...            1,374               2,771             3,438
  Depreciation..................................           22,787              57,379            59,246
  Amortization..................................               --               5,884             6,509
  Real estate taxes.............................           18,317              34,000            37,208
  Insurance.....................................            1,255               3,060             3,463
  Repairs and maintenance.......................           19,651              45,540            49,594
  Property operating............................           23,662              44,685            51,558
  General and administrative....................            5,855              17,201            16,278
                                                     ------------            --------          --------
  Total expenses................................          118,694             291,001           314,845
                                                     ------------            --------          --------
Income before allocation to minority interests,
  income from investment in unconsolidated joint
  ventures, gain on sales of real estate and
  extraordinary items...........................           45,874              48,103            38,392
Minority interests -- Partially Owned
  Properties....................................             (279)               (912)           (2,166)
Income from unconsolidated joint ventures.......            1,426               1,982             1,554
Gain on sales of real estate....................               --              12,510             5,262
                                                     ------------            --------          --------
Income before extraordinary items...............           47,021              61,683            43,042
Extraordinary items.............................          (12,930)               (274)               --
                                                     ------------            --------          --------
Net income......................................     $     34,091            $ 61,409          $ 43,042
                                                     ============            ========          ========
Net income per Unit:
  Income before extraordinary items.............     $       0.29            $     --          $     --
  Extraordinary items...........................            (0.08)                 --                --
                                                     ------------            --------          --------
Net income per Unit.............................     $       0.21            $     --          $     --
                                                     ============            ========          ========
Weighted average Units outstanding..............      164,146,710                  --                --
                                                     ============            ========          ========
</TABLE>
 
                            See accompanying notes.
 
                                      F-24
<PAGE>   278
 
     EOP OPERATING LIMITED PARTNERSHIP CONSOLIDATED STATEMENT OF CASH FLOWS
        AND EQUITY OFFICE PREDECESSORS COMBINED STATEMENTS OF CASH FLOWS
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                                 EQUITY OFFICE
                                                         EOP OPERATING        EQUITY OFFICE      PREDECESSORS
                                                      LIMITED PARTNERSHIP    PREDECESSORS FOR    FOR THE NINE
                                                      FOR THE PERIOD FROM    THE PERIOD FROM     MONTHS ENDED
                                                       JULY 11, 1997 TO     JANUARY 1, 1997 TO   SEPTEMBER 30,
                                                      SEPTEMBER 30, 1997      JULY 10, 1997          1996
                                                      -------------------   ------------------   -------------
                                                                          ($ IN THOUSANDS)
<S>                                                   <C>                   <C>                  <C>
Operating activities:
  Net income.........................................      $ 34,091             $  61,409          $ 43,042
  Adjustment to reconcile net income to net cash
    provided by operating activities:
    Depreciation and amortization....................        24,161                66,034            69,193
    (Income) from unconsolidated joint ventures......        (1,426)               (1,982)           (1,554)
    (Gain) on sale of real estate....................            --               (12,510)           (5,262)
    Extraordinary loss from early extinguishments of
       debt..........................................        12,930                   274                --
    Provision for doubtful accounts..................         1,556                 1,175               549
    Allocation to minority interests.................           279                   912             2,166
    Changes in assets and liabilities:
       Decrease (increase) in rents receivable.......         5,297                 2,664           (10,398)
       (Increase) in deferred rent receivables.......       (10,213)               (8,061)               --
       (Increase) in other assets....................       (27,742)               (8,839)           (4,154)
       Increase in accounts payable and accrued
         expenses....................................        12,504                 2,916               190
       (Decrease) increase in due to affiliates......        (1,678)                 (722)            2,240
       Increase (decrease) in other liabilities......         9,906                (7,310)           (6,327)
                                                           --------             ---------          --------
       Net cash provided by operating activities.....        59,665                95,960            89,685
                                                           --------             ---------          --------
Investing activities:
  Property acquisitions..............................       (26,025)             (531,968)         (485,715)
  Payments for capital and tenant improvements.......       (42,587)              (59,511)          (78,690)
  Proceeds from sale of real estate..................            --                72,078            14,504
  Distributions from (investments in) unconsolidated
    joint ventures...................................         1,535               (44,260)            1,443
  Payments of lease acquisition costs................        (6,331)               (9,260)          (15,827)
  (Increase) decrease in escrow deposits and
    restricted cash..................................       (12,226)                1,853           (25,055)
                                                           --------             ---------          --------
         Net cash (used for) investing activities....       (85,634)             (571,068)         (589,340)
                                                           --------             ---------          --------
Financing activities:
  Proceeds from common stock, net of offering
    costs............................................       564,506                    --                --
  Capital contributions..............................            --               287,949           253,771
  Capital distributions..............................            --              (288,652)          (26,408)
  Distributions to minority interest partners........        (1,355)               (3,401)          (21,177)
  Cash contributed from net assets...................       181,163                    --                --
  Proceeds from mortgage notes.......................         1,697               154,090           483,116
  Proceeds from unsecured notes......................       180,000                    --                --
  Proceeds from line of credit.......................       425,125               218,000           140,225
  Principal payments on mortgage notes...............      (691,714)              (47,472)         (205,406)
  Principal payments on lines of credit..............      (486,625)              (72,500)          (89,100)
  Payments of loan costs.............................        (1,327)               (1,889)           (4,741)
  Prepayment penalties on early extinguishments of
    debt.............................................       (12,877)                 (274)               --
                                                           --------             ---------          --------
         Net cash provided by financing activities...       158,593               245,851           530,280
                                                           --------             ---------          --------
Net increase (decrease) in cash and cash
  equivalents........................................       132,624              (229,257)           30,625
Cash and cash equivalents at the beginning of the
  period.............................................            25               410,420           111,121
                                                           --------             ---------          --------
Cash and cash equivalents at the end of the period...      $132,649             $ 181,163          $141,746
                                                           ========             =========          ========
Supplemental information:
    Interest paid during the period, including
       capitalized interest of $1,711, $3,669 and
       $532, respectively............................      $ 30,273             $  82,969          $ 86,794
                                                           ========             =========          ========
</TABLE>
 
                            See accompanying notes.
 
                                      F-25
<PAGE>   279
 
        EOP OPERATING LIMITED PARTNERSHIP AND EQUITY OFFICE PREDECESSORS
 
            NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS
                                  (UNAUDITED)
 
1. ORGANIZATION
 
     EOP Operating Limited Partnership, an Illinois limited partnership
(together with its subsidiaries, the "Operating Partnership"), was formed to
conduct the office property business of Equity Office Properties Trust, a
Maryland real estate investment trust (the "Company"), and the predecessors
thereof ("Equity Office Predecessors"). The Company was formed on October 9,
1996 to continue and expand the national office property business organized by
Mr. Samuel Zell, Chairman of the Board of Trustees of the Company. The Operating
Partnership is a fully integrated, self-administered and self-managed real
estate company engaged in acquiring, owning, managing, leasing and renovating
office properties and parking facilities. As of September 30, 1997, the
Operating Partnership owned or had an interest in 93 office properties (the
"Office Properties") containing 33.4 million rentable square feet and 16
stand-alone parking facilities (the "Parking Facilities" and together with the
Office Properties, the "Properties") containing 16,037 parking spaces. The
Office Properties are located in 48 submarkets in 35 markets throughout the
United States.
 
     The Company's assets, which include investments in joint ventures, are
owned by, and substantially all of its operations are conducted through, the
Operating Partnership. The Company is the managing general partner of the
Operating Partnership. The Company expects to qualify as a real estate
investment trust ("REIT") for federal income tax purposes.
 
     On July 11, 1997, the Operating Partnership completed the consolidation of
the entities which comprised Equity Office Predecessors (the "Consolidation") in
connection with the consummation of the Company's initial public offering (the
"Offering"). In the Offering, the Company sold 28,750,000 of its common shares
of beneficial interest, $0.01 par value per share ("Common Shares") (including
3,750,000 Common Shares relating to the underwriters overallotment option), at
$21 per Common Share, generating proceeds of $603,750,000. The Company
contributed the net proceeds from the Offering (after deducting the underwriting
discount of $39,243,750) of $564,506,250 to the Operating Partnership in
exchange for 28,750,000 units of partnership interest in the Operating
Partnership ("Units"). The Operating Partnership used the net proceeds of the
Offering contributed to it by the Company and available cash reserves to repay
debt of approximately $678,394,000, of which $598,394,000 was mortgage debt and
$80,000,000 was a revolving line of credit.
 
     Concurrent with the Offering, the Operating Partnership also completed the
following formation transactions which resulted in the Consolidation of the
Equity Office Predecessors into the Operating Partnership:
 
     - Zell/Merrill Lynch Real Estate Opportunity Partners Limited Partnership,
       Zell/Merrill Lynch Real Estate Opportunity Partners Limited Partnership
       II, Zell/Merrill Lynch Real Estate Opportunity Partners Limited
       Partnership III and Zell/Merrill Lynch Real Estate Opportunity Partners
       Limited Partners IV (collectively the "ZML Opportunity Partnerships"),
       the predecessor owners of the Properties, contributed their interests in
       the Properties to the Operating Partnership in exchange for 126,419,397
       Units.
 
     - ZML Investors Inc., ZML Investors II, Inc., Zell/Merrill Lynch Real
       Estate Opportunity Partners III Trust and Zell/Merrill Lynch Real Estate
       Opportunity Partners IV Trust (collectively the "ZML REITs") merged into
       the Company, with the Company succeeding to their interests in, and
       becoming the managing general partners of each of the ZML Opportunity
       Partnerships. Shareholders of the ZML REITs received 122,900,572 Common
       Shares of the Company in exchange for their interests in the ZML REITs.
 
     - Equity Group Investments, Inc., an Illinois corporation ("EGI"), and
       Equity Office Holdings, L.L.C., a Delaware limited liability company
       ("EOH" and together with EGI, the "Equity Group") contributed
       substantially all of their interests in their office property and asset
       management business
 
                                      F-26
<PAGE>   280
 
       and parking facilities management business (collectively the "Management
       Business") to the Operating Partnership in exchange for 8,358,822 Units.
 
     - The Operating Partnership transferred a portion of the office property
       management business of EOH, the office property asset management business
       and the parking asset management business of the Equity Group that
       relates to the property management of the properties owned by the Equity
       Group, together with the 18 Properties held in partnerships or subject to
       participation agreements with unaffiliated parties (the "Joint Venture
       Properties") (collectively, the "Managed Property Business") to Equity
       Office Properties Management Corp., a Delaware corporation (the
       "Management Corp."), in exchange for non-voting stock representing 95% of
       the economic value in the Management Corp. and EOH contributed $150,000
       to the Management Corp. in exchange for voting stock representing 5% of
       the economic value of the Management Corp.
 
     - ZML Partners Limited Partnership, ZML Partners Limited Partnership II,
       ZML Partners Limited Partnership III and ZML Partners Limited Partnership
       IV (the "ZML Partners"), each of which is the general partner of one of
       the ZML Opportunity Partnerships, each transferred their 5% interest in
       certain corporations which owned a 1% general partnership interest in
       certain of the property title holding entities to a newly formed
       qualified REIT subsidiary ("QRS") in exchange for 26,458 Common Shares.
 
     - The Operating Partnership transferred its 95% interest in certain
       corporations which owned a 1% general partner interest in certain of the
       property title holding entities to a newly formed QRS in exchange for
       502,740 Common Shares. Such Common Shares have been treated as treasury
       stock in the accompanying financial statements.
 
     The table below summarizes the ownership of the Operating Partnership upon
the completion of the transactions described above:
 
<TABLE>
<CAPTION>
       OWNERSHIP OF EOP OPERATING LIMITED PARTNERSHIP         NUMBER OF UNITS    PERCENTAGE
       ----------------------------------------------         ---------------    ----------
<S>                                                           <C>                <C>
Equity Office Properties Trust (held directly)..............     28,777,458          17.6%
Equity Office Properties Trust (held through its interests
  in the ZML Opportunity Partnerships)......................    122,900,572          75.1%
                                                               ------------        ------
Equity Office Properties Trust subtotal.....................    151,678,030          92.7%
ZML Partners (held through its interests in ZML Opportunity
  Partnerships).............................................      3,229,001           2.0%
Other limited partner (held through its interest in ZML
  Opportunity Partnership II)...............................        289,824           0.2%
Equity Group Investments, Inc...............................      3,737,438           2.3%
Equity Office Holdings, L.L.C...............................      4,621,384           2.8%
                                                               ------------        ------
  Total.....................................................    163,555,677         100.0%
                                                               ============        ======
</TABLE>
 
2. BASIS OF PRESENTATION
 
     The consolidated financial statements of the Operating Partnership reflect
the Properties at their carryover historical basis of accounting to the extent
that interests in the Properties were transferred from Equity Office
Predecessors to the Operating Partnership by the Equity Group. The remaining
interests acquired by the Operating Partnership from other owners of Equity
Office Predecessors have been accounted for as a purchase and the excess of the
purchase price over the related historical basis of the net assets acquired was
allocated primarily to investment in real estate.
 
     The combined financial statements of Equity Office Predecessors prior to
the Consolidation included interests in the properties of the ZML Opportunity
Partnerships together with their limited and general partners (collectively, the
"ZML Funds" which includes ZML Fund I, ZML Fund II, ZML Fund III and ZML Fund
IV) and the Management Business. The combined financial statements of Equity
Office Predecessors are presented on a combined basis, at historical cost,
because the ZML Funds and the Management Business were under common control and
management of the owners of the Equity Group through general partnership
interests in the ZML Funds and through their ownership of the Management
 
                                      F-27
<PAGE>   281
 
Business. Minority interests have been recorded for those entities that were not
wholly owned by the ZML Funds. Where controlling interests were not held by the
ZML Funds, the entities were accounted for as investments in unconsolidated
joint ventures utilizing equity accounting. All intercompany transactions and
balances have been eliminated in combination.
 
     The consolidated financial statements of the Operating Partnership and the
combined financial statements of Equity Office Predecessors have been prepared
pursuant to the Securities and Exchange Commission ("SEC") rules and
regulations. The following notes highlight significant changes to the notes to
the December 31, 1996 audited combined financial statements of Equity Office
Predecessors contained elsewhere herein and present interim disclosures as
required by the SEC.
 
3. USE OF ESTIMATES
 
     The preparation of the consolidated financial statements of the Operating
Partnership and the combined financial statements of Equity Office Predecessors
in accordance with generally accepted accounting principles requires management
to make estimates and assumptions that affect the amounts reported in the
financial statements and accompanying notes. Actual results could differ from
those estimates.
 
4. UNAUDITED INTERIM STATEMENTS
 
     The consolidated financial statements of the Operating Partnership as of
September 30, 1997 and for the period from July 11, 1997 to September 30, 1997,
and the combined financial statements of Equity Office Predecessors for the
periods from July 1, 1997 to July 10, 1997, January 1, 1997 to July 10, 1997 and
for the three and nine months ended September 30, 1996 and related footnote
disclosures are unaudited. In the opinion of management, such financial
statements reflect all adjustments necessary for a fair presentation of the
results of the interim periods. All such adjustments are of a normal, recurring
nature.
 
5. RECLASSIFICATIONS
 
     Certain reclassifications have been made to the 1996 statements contained
herein in order to provide comparability with the 1997 statements reported
herein. These reclassifications have not changed the 1996 results or owners'
equity.
 
6. INVESTMENT IN RENTAL PROPERTY
 
     During the quarter ended September 30, 1997, the Operating Partnership
acquired the four Properties listed below. Each Property was purchased from an
unaffiliated party.
 
<TABLE>
<CAPTION>
                                                                TOTAL
    DATE                                                       SQUARE     PARKING
  ACQUIRED             PROPERTY                LOCATION         FEET      SPACES    PURCHASE PRICE
  --------             --------                --------       ---------   -------   --------------
  <C>       <S>                             <C>               <C>         <C>       <C>
   8/11/97  Adams-Wabash Parking Garage     Chicago, IL              --      670     $ 25,000,000(1)
    9/3/97  Columbus America Properties                                               140,000,000(2)
              LL&E Tower                    New Orleans, LA     545,157       --               --
            Texaco Center                   New Orleans, LA     619,714       --               --
            601 Tchoupitoulas               New Orleans, LA          --      759               --
                                                              ---------    -----     ------------
                                                              1,164,871    1,429     $165,000,000
                                                              =========    =====     ============
</TABLE>
 
- ---------------
 
(1) The total purchase price was paid from available cash.
(2) The purchase price was paid with $90.9 million in cash funded primarily from
    the $600 million credit facility and $49.1 million in Units (1,692,546 Units
    at $29 per Unit).
 
7. INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
 
     Equity Office Predecessors acquired a mortgage receivable secured by the
500 Orange Tower office property ("500 Orange") and purchased land underlying
and adjacent to 500 Orange in July 1994, and acquired a 50% limited partnership
interest in Civic Parking, L.L.C. in April 1997. These transactions were
 
                                      F-28
<PAGE>   282
 
accounted for utilizing the equity method of accounting. Under this method of
accounting, the net equity investment of the Operating Partnership is reflected
on the consolidated and combined balance sheets, and the consolidated and
combined statements of operations include the Operating Partnership's share of
net income or loss from 500 Orange and Civic Parking, L.L.C. The Operating
Partnership's share of net income or loss from 500 Orange and Civic Parking,
L.L.C. is approximately 100% and 50%, respectively. Selected balance sheets and
statements of operations data for the Operating Partnership's interest in 500
Orange and Civic Parking, L.L.C. is as follows:
<TABLE>
<CAPTION>
                                                      500 ORANGE TOWER            CIVIC PARKING, L.L.C.
                BALANCE SHEETS                  ----------------------------   ----------------------------
                                                SEPTEMBER 30,   DECEMBER 31,   SEPTEMBER 30,   DECEMBER 31,
                                                    1997            1996           1997            1996
                                                -------------   ------------   -------------   ------------
<S>                                             <C>             <C>            <C>             <C>
                                                                     ($ IN THOUSANDS)
 
<CAPTION>
                                                                                                 (NOTE A)
<S>                                             <C>             <C>            <C>             <C>
ASSETS:
  Investment in real estate, net..............     $42,082        $26,555         $51,383             --
  Cash and cash equivalents...................         538            147           1,173             --
  Rents and other receivables.................          46            150              65             --
  Other assets................................         190            720              33             --
                                                   -------        -------         -------        -------
               TOTAL ASSETS...................     $42,856        $27,572         $52,654             --
                                                   =======        =======         =======        =======
LIABILITIES AND OWNERS' EQUITY:
  Accounts payable and accrued expenses.......     $   897        $   364         $   367             --
  Due to affiliates...........................          --             19              34             --
  Other liabilities...........................         369            279              17             --
                                                   -------        -------         -------        -------
               TOTAL LIABILITIES..............       1,266            662             418             --
                                                   -------        -------         -------        -------
  Shareholders'/owners' equity................      41,590         26,910          52,236             --
                                                   -------        -------         -------        -------
               TOTAL LIABILITIES AND OWNERS'
                 EQUITY.......................     $42,856        $27,572         $52,654             --
                                                   =======        =======         =======        =======
</TABLE>
<TABLE>
<CAPTION>
                                                     500 ORANGE TOWER              CIVIC PARKING, L.L.C.
                                               -----------------------------   -----------------------------
                                                    THREE MONTHS ENDED              THREE MONTHS ENDED
          STATEMENTS OF OPERATIONS             -----------------------------   -----------------------------
                                               SEPTEMBER 30,   SEPTEMBER 30,   SEPTEMBER 30,   SEPTEMBER 30,
                                                   1997            1996            1997            1996
                                               -------------   -------------   -------------   -------------
<S>                                            <C>             <C>             <C>             <C>
                                                                     ($ IN THOUSANDS)
 
<CAPTION>
                                                                                                 (NOTE A)
<S>                                            <C>             <C>             <C>             <C>
Revenues:
  Rental.....................................     $1,073          $1,123          $   70               --
  Tenant reimbursements......................         63              14               6               --
  Parking....................................          1              --           1,164               --
  Other......................................        152              12              14               --
                                                  ------          ------          ------          -------
               Total revenues................      1,289           1,149           1,254               --
                                                  ------          ------          ------          -------
Expenses:
  Interest...................................         --              --              --               --
  Depreciation...............................        196             217             313               --
  Amortization...............................          8              35              --               --
  Real estate taxes and insurance............         87              43             113               --
  Repairs and maintenance....................        102             160               2               --
  Property operating.........................        339             217              --               --
                                                  ------          ------          ------          -------
               Total expenses................        732             672             428               --
                                                  ------          ------          ------          -------
Net income...................................     $  557          $  477          $  826               --
                                                  ======          ======          ======          =======
</TABLE>
 
                                      F-29
<PAGE>   283
<TABLE>
<CAPTION>
                                                     500 ORANGE TOWER              CIVIC PARKING, L.L.C.
                                               -----------------------------   -----------------------------
                                                     NINE MONTHS ENDED               NINE MONTHS ENDED
                                               -----------------------------   -----------------------------
                                               SEPTEMBER 30,   SEPTEMBER 30,   SEPTEMBER 30,   SEPTEMBER 30,
                                                   1997            1996            1997            1996
                                               -------------   -------------   -------------   -------------
<S>                                            <C>             <C>             <C>             <C>
                                                                     ($ IN THOUSANDS)
 
<CAPTION>
                                                                                                 (NOTE A)
<S>                                            <C>             <C>             <C>             <C>
Revenues:
  Rental.....................................     $3,579          $3,461          $  195               --
  Tenant reimbursements......................        (20)             73               6               --
  Parking....................................          1              --           2,137               --
  Other......................................        178              22              14               --
                                                  ------          ------          ------          -------
               Total revenues................      3,738           3,556           2,352               --
                                                  ------          ------          ------          -------
Expenses:
  Interest...................................         --              --              --               --
  Depreciation...............................        710             618             528               --
  Amortization...............................         92              74              --               --
  Real estate taxes and insurance............         17             298             210               --
  Repairs and maintenance....................        436             484               3               --
  Property operating.........................        686             528              --               --
                                                  ------          ------          ------          -------
               Total expenses................      1,941           2,002             741               --
                                                  ------          ------          ------          -------
               Net income....................     $1,797          $1,554          $1,611               --
                                                  ======          ======          ======          =======
</TABLE>
 
Note A: The balance sheet data as of December 31, 1996 and operational data for
        the three and nine months ended September 30, 1996 is not applicable
        since Civic Parking, L.L.C. was not owned by the Operating Partnership
        or Equity Office Predecessors at or during these periods.
 
8. MORTGAGE NOTES, UNSECURED NOTES AND LINES OF CREDIT
 
     On July 15, 1997, the Operating Partnership obtained a $600 million
unsecured revolving credit facility (the "$600 million Credit Facility") which
is used for acquisitions and general corporate purposes. Amounts were drawn on
the $600 million Credit Facility to repay the outstanding balance on the
previous ZML Fund IV line of credit (the "$475 Million Line") which was
terminated when the $600 million Credit Facility was obtained. The $600 million
Credit Facility matures on July 15, 2000. The Operating Partnership paid a
commitment fee on the $600 million Credit Facility at closing of approximately
$645,000. In addition, until the Operating Partnership receives a long term debt
rating of BBB- or Baa3 or higher by two rating agencies, an unused commitment
fee is payable quarterly in arrears based upon the unused amount of the $600
million Credit Facility as follows: .15% per annum if the unused amount is
between 0 to 33%; .20% per annum if the unused amount is more than 33% but less
than 66%; .25% per annum if the unused amount is more than 66%. The $600 million
Credit Facility carries an interest rate equal to LIBOR plus 110 basis points.
Once the Operating Partnership receives the rating as described above, a
competitive bid option will become available for up to $250 million of the
facility amount, the interest rate spread will be reduced on a sliding scale
based upon the Operating Partnership's senior unsecured debt rating and the
unused commitment fee will be replaced by a facility fee of .20% per annum. As
of November 14, 1997, no amounts were outstanding under the $600 million Credit
Facility.
 
     On September 3, 1997, the Operating Partnership completed a private debt
offering of $180 million (the "$180 million Private Debt Offering") with an
unaffiliated party. The terms of the $180 million Private Debt Offering consist
of four tranches with maturities from seven to ten years which were priced at an
interest rate spread over the corresponding U.S. Treasury rate. The Operating
Partnership used the proceeds of the $180 million Private Debt Offering to repay
a portion of the $600 million Credit Facility. In addition, the Operating
Partnership terminated $150 million of hedge agreements at a cost of
approximately $3.9 million in connection with the $180 million Private Debt
Offering. This amount will be amortized to interest expense over the
 
                                      F-30
<PAGE>   284
 
respective terms of each tranche. A summary of the terms of the $180 million
Private Debt Offering is as follows:
 
<TABLE>
<CAPTION>
               TRANCHE                                AMOUNT       STATED RATE   EFFECTIVE RATE(A)
               -------                             ------------    -----------   -----------------
<C>                                                <C>               <C>              <C>
  7 Year Senior Notes due 2004...................  $ 30,000,000      7.24%            7.24%
  8 Year Senior Notes due 2005...................    50,000,000      7.36%            7.67%
  9 Year Senior Notes due 2006...................    50,000,000      7.44%            7.73%
  10 Year Senior Notes due 2007..................    50,000,000      7.42%            7.69%
                                                   ------------
                                                   $180,000,000
                                                   ============
</TABLE>
 
- ---------------
 
(A) Includes the cost of the amortized terminated interest rate protection
    agreements.
 
     As of September 30, 1997, the Operating Partnership had outstanding
mortgage indebtedness of approximately $1.3 billion encumbering 48 of the
Properties. The carrying value of such Properties, net of accumulated
depreciation of approximately $12 million, was approximately $2.6 billion.
 
     In order to limit the market risk associated with variable rate debt, the
Operating Partnership entered into several interest rate protection agreements.
These agreements effectively convert floating rate debt to a fixed rate basis,
as well as hedge anticipated financing transactions. Net amounts paid or
received under these agreements are recognized as an adjustment to interest
expense when such amounts are incurred or earned. Settlement amounts paid or
received under these agreements are deferred and amortized over the term of the
related financing transaction on the straight-line method which approximates the
effective yield method. A summary of the various interest rate hedge agreements
is as follows: (1) On June 4, 1997, the Operating Partnership entered into
interest rate protection agreements for $700 million of indebtedness. As a
result of this arrangement, the Operating Partnership has essentially "locked
into" U.S. Treasury rates in effect as of June 4, 1997, for $700 million in
indebtedness. In August 1997, the Operating Partnership terminated $150 million
of the $700 million of hedge agreements at a cost of $3.9 million. The
terminated agreements pertained to the $180 million Private Debt Offering. The
portion of the Private Debt Offering protected by these agreements consisted of
three tranches with maturities of eight, nine and ten years, respectively. The
cost of the terminated hedge agreements will be amortized to interest expense
over the respective terms of each tranche. (2) On October 6, 1997, the Operating
Partnership entered into an additional $450 million of interest rate protection
agreements based on the U.S. Treasury rates in effect at that date. The
Operating Partnership intends to terminate these agreements and the remaining
$550 million hedge agreements described above at such time as it incurs fixed
rate indebtedness. Upon the occurrence of such termination, the Operating
Partnership will either owe money or be entitled to receive money depending on
whether U.S. Treasury rates have increased (resulting in a payment to the
Operating Partnership) or decreased (resulting in a payment obligation of the
Operating Partnership) subsequent to the date of the hedge. The counterparties
to these arrangements are major U.S. financial institutions. (3) Equity Office
Predecessors entered into an interest rate swap agreement in October 1995 which
effectively fixed the interest rate on a $93.6 million mortgage loan at 6.94%
through the maturity of the loan on June 30, 2000.
 
9. PARTNERS' CAPITAL
 
     As discussed in Note 1 above, the Operating Partnership issued 163,555,677
Units in connection with the Consolidation and Offering. On September 3, 1997,
the EOP Partnership issued 1,692,546 Units in connection with the Columbus
America Properties acquisition.
 
     On September 26, 1997, the Company as general partner of the Operating
Partnership, declared a distribution of $.26 per Unit outstanding, representing
a pro rata distribution since the closing of the Offering on July 11, 1997,
based upon a full quarterly distribution of $.30 per Unit and an annual
distribution of $1.20 per Unit, totaling approximately $42,964,500. The
distribution was paid on October 9, 1997 to Unit holders of record on September
29, 1997.
 
                                      F-31
<PAGE>   285
 
10. NON-CASH INVESTING AND FINANCING ACTIVITIES
 
     Additional supplemental disclosures of non-cash investing and financing
activities for the nine months ended September 30, 1997 and 1996 are as follows:
 
     (1) The following summarizes the assets and liabilities contributed by
         Equity Office Predecessors in exchange for 122,928,030 Common Shares of
         the Company and 11,877,647 Units of the Operating Partnership at the
         Consolidation on July 11, 1997:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Investment in real estate...................................   $ 4,815,234
Investment in unconsolidated joint ventures.................        93,935
Cash contributed to the Operating Partnership...............       181,163
                                                               -----------
                                                               $ 5,090,332
                                                               ===========
Debt........................................................   $ 2,196,708
Other liabilities over assets, net..........................        62,706
Owners' equity..............................................     2,830,918
                                                               -----------
                                                               $ 5,090,332
                                                               ===========
</TABLE>
 
<TABLE>
<CAPTION>
                                                 EOP OPERATING             EQUITY OFFICE
                                              LIMITED PARTNERSHIP          PREDECESSORS             EQUITY OFFICE
                                              FOR THE PERIOD FROM       FOR THE PERIOD FROM      PREDECESSORS FOR THE
                                                JULY 11, 1997 TO        JANUARY 1, 1997 TO        NINE MONTHS ENDED
                                               SEPTEMBER 30, 1997          JULY 10, 1997          SEPTEMBER 30, 1996
                                              --------------------      -------------------      --------------------
                                                                          (IN THOUSANDS)
<S>                                           <C>                       <C>                      <C>
Mortgage loans assumed through acquisition
  of Properties:..........................           $90,000                    $--                    $55,000
                                                     =======                    ===                    =======
Issuance of 1,692,546 Units in connection
  with the acquisition of Properties:.....           $49,100                    $--                    $    --
                                                     =======                    ===                    =======
</TABLE>
 
11. PRO FORMA STATEMENT OF OPERATIONS
 
     The pro forma data presented below is included to illustrate the effect on
the Operating Partnership's operations as a result of the transactions described
below.
 
     The pro forma consolidated statement of operations for the three and nine
months ended September 30, 1997 is presented as if the following transactions
occurred on January 1, 1997: (1) the acquisition of 30 Office Properties and six
Parking Facilities acquired between January 1, 1997 and October 17, 1997 and the
disposition of two Office Properties; (2) the Private Debt Offering which
occurred on September 3, 1997; (3) the Consolidation and the Offering and the
decrease in interest expense resulting from the use of the net proceeds for the
repayment of mortgage debt; and (4) the decrease in interest expense resulting
from draws from the $1.5 billion Credit Facility (see Note 17 (7)) used to
refinance existing debt.
 
     The pro forma consolidated statement of operations for the nine months
ended September 30, 1996 is presented as if the following transactions occurred
on January 1, 1996: (1) the acquisition of 40 Office Properties and 13 Parking
Facilities acquired between January 1, 1996 and October 17, 1997 and the
disposition of two Office Properties; (2) the Private Debt Offering which
occurred on September 3, 1997; (3) the Consolidation and the Offering and the
decrease in interest expense resulting from the use of the net proceeds for the
repayment of mortgage debt; and (4) the decrease in interest expense resulting
from draws from the $1.5 billion credit facility (see Note 17 (7)) used to
refinance existing debt.
 
                                      F-32
<PAGE>   286
 
     The accompanying unaudited pro forma consolidated statement of operations
have been prepared by management of the Operating Partnership and do not purport
to be indicative of the results which would actually have been obtained had the
transactions described above been completed on the dates indicated or which may
be obtained in the future. The pro forma consolidated statement of operations
should be read in conjunction with the accompanying notes to the financial
statements contained herein.
 
<TABLE>
<CAPTION>
                                                     FOR THE THREE
                                                     MONTHS ENDED      FOR THE NINE MONTHS ENDED
                                                     -------------   -----------------------------
                                                     SEPTEMBER 30,   SEPTEMBER 30,   SEPTEMBER 30,
                                                         1997            1997            1996
                                                     -------------   -------------   -------------
                                                                   ($ IN THOUSANDS)
<S>                                                  <C>             <C>             <C>
Revenues:
  Rental...........................................  $    168,869    $    496,087    $    461,627
  Tenant reimbursements............................        35,657          99,239          89,791
  Parking..........................................        15,303          40,167          37,032
  Other............................................         1,893           9,989          11,787
  Fees from noncombined affiliate..................         1,401           3,841           3,126
  Interest.........................................         1,399          10,589           6,445
                                                     ------------    ------------    ------------
               Total revenues......................       224,522         659,912         609,808
                                                     ------------    ------------    ------------
Expenses:
  Property operating...............................        85,606         247,789         242,575
  Interest.........................................        42,997         126,311         125,544
  Depreciation.....................................        34,219         102,658         102,658
  Amortization.....................................         3,326           8,272           7,533
  General and administrative.......................         8,930          24,856          18,078
                                                     ------------    ------------    ------------
               Total expenses......................       175,078         509,886         496,388
                                                     ------------    ------------    ------------
Income before allocation to minority interests,
  income from investment in unconsolidated joint
  ventures, gain on sale of real estate and
  extraordinary items..............................        49,444         150,026         113,420
Minority interests -- Partially Owned Properties...          (326)         (1,233)         (2,208)
Income from investment in unconsolidated joint
  ventures.........................................         1,297           4,431           3,528
Gain on sale of real estate........................            --              --           5,262
                                                     ------------    ------------    ------------
Income before extraordinary items..................        50,415         153,224         120,002
Extraordinary items................................       (12,929)        (12,929)             --
                                                     ------------    ------------    ------------
  Net income.......................................  $     37,486    $    140,295    $    120,002
                                                     ============    ============    ============
Net income per Unit:
  Income before extraordinary items................  $        .29    $        .86    $        .67
  Extraordinary items..............................          (.08)           (.08)             --
                                                     ------------    ------------    ------------
Net income per Unit................................  $        .21    $        .78    $        .67
                                                     ============    ============    ============
Number of Units outstanding........................   179,195,816     179,195,816     179,195,816
                                                     ============    ============    ============
</TABLE>
 
12. COMMITMENTS AND CONTINGENCIES
 
     The Operating Partnership has become a party to various legal actions
resulting from the operating activities transferred to it in connection with the
Consolidation. These actions are incidental to the transferred business and
management does not believe that these actions will have a material adverse
effect on the Operating Partnership.
 
     ZML-Chicago Parking Limited Partnership ("ZCP") and ZML-North Loop/Theatre
District Parking Limited Partnership ("NLT"), were named as defendants in an
action (the "Action") brought by an investor (the "Plaintiff") in an
unaffiliated entity owning an interest in NLT. The Action was brought in the
Circuit Court of Cook County, Illinois, Chancery Division, on August 15, 1995.
NLT is the owner of two Parking
 
                                      F-33
<PAGE>   287
 
Facilities, North Loop Transportation Center and Theatre District Self Park
("Theatre District Garage"). The Plaintiff demands rescission of certain
transactions related to the acquisition by NLT of the Theatre District Garage.
The case was settled on October 1, 1997 and accordingly, was dismissed with
prejudice pursuant to an order of even date. ZCP and NLT are fully indemnified
by certain of the other co-defendants and will not be contributing any funds to
the settlement.
 
     Except as described above, management of the Operating Partnership does not
believe there is any litigation threatened against the Operating Partnership
other than routine litigation arising out of the ordinary course of business,
some of which is expected to be covered by liability insurance, and none of
which is expected to have a material adverse effect on the consolidated
financial statements of the Operating Partnership.
 
13. MERGER
 
     On September 15, 1997, the Company and the Operating Partnership entered
into a definitive agreement and plan of merger with Beacon Properties
Corporation and Beacon Properties, L.P. (collectively "Beacon") whereby Beacon's
portfolio of 126 buildings containing 20.7 million square feet will be
integrated into that of the Operating Partnership. The merger was unanimously
approved by the Company's Board of Trustees and Beacon's Board of Directors. The
merger plan calls for the Operating Partnership to issue 1.4063 Class A Units of
the Operating Partnership for each Common Partnership Unit of Beacon Properties,
L.P. which is anticipated to result in the issuance of approximately 9.8 million
Units and the assumption of outstanding liabilities of approximately $1.0
billion as well as approximately 84.0 million Common Shares and $200 million in
preferred shares to be issued in the connection the Merger of the Company and
Beacon Properties Corporation. The merger, which will be accounted for under the
purchase method of accounting, is expected to be completed in December, 1997
with a total purchase price of approximately $4.3 billion and is subject to the
approval of the shareholders of both companies, unitholders of Beacon and other
conditions. There can be no assurance that this transaction will be consummated
as described above.
 
14. SUBSEQUENT EVENTS
 
     (1) In October, 1997, the Operating Partnership purchased the following
office properties from an unaffiliated party:
 
        - Destec Tower, a 25-story, 574,216 square-foot office tower in Houston,
          Texas;
 
        - Brookhollow Central I, II and III, a 800,688 square foot office
          complex in suburban Houston, Texas;
 
        - 8080 Central, a 17-story, 283,707 square foot office building near
          Dallas, Texas; and
 
        - 1700 Market, a 32-story, 825,547 square foot office building in
          Philadelphia, Pennsylvania.
 
     The purchase price of approximately $289 million was comprised of $211.9
million in cash, $6.0 million of liabilities assumed and $71.1 million in Units
issued at a price of $24.50 per Unit. In October 1997, affiliates of the seller
of the foregoing properties purchased approximately $73.95 million in restricted
Common Shares for $24.50 per share.
 
     (2) On October 6, 1997, the Operating Partnership purchased from an
unaffiliated party 550 South Hope Street, a 566,434 square foot, 27-story office
building located in Los Angeles, California. The purchase price of approximately
$99.5 million was paid in cash.
 
     (3) On October 7, 1997, the Operating Partnership purchased from
unaffiliated parties interests in the following office buildings located in
suburban Philadelphia, Pennsylvania:
 
        - Four Falls Corporate Center, consisting of 254,355 square feet;
 
        - Oak Hill Plaza, consisting of 164,360 square feet;
 
        - Walnut Hill Plaza, consisting of 149,716 square feet;
 
        - Two Valley Square, consisting of 70,622 square feet;
 
                                      F-34
<PAGE>   288
 
        - Four Valley Square, consisting of 49,757 square feet;
 
        - Five Valley Square, consisting of 18,564 square feet;
 
        - One Devon Square, consisting of 77,267 square feet;
 
        - Two Devon Square, consisting of 63,226 square feet;
 
        - Three Devon Square, consisting of 6,000 square feet;
 
     The purchase price of approximately $127.5 million was comprised of $14.39
million in Units at a price of $28.775 per Unit, cash of approximately $98.41
million and $14.7 million of debt assumed by the Operating Partnership.
 
     In addition, the Company's Board of Trustees approved the purchase by the
Operating Partnership of an interest in the following two properties from a
party affiliated with the seller of the above properties:
 
        - One Valley Square, consisting of 70,289 square feet; and
 
        - Three Valley Square, consisting of 84,605 square feet.
 
     The purchase price of the interests in these properties is approximately
$17.2 million of which approximately $4 million will be paid in Units to be
issued at a price of $28.775 per Unit and the remainder will be comprised of a
combination of cash and the assumption of debt. This transaction is contingent
upon certain terms and conditions as set forth in the purchase agreement. There
can be no assurance that this transaction will be consummated as described
above.
 
     The Operating Partnership shall have the option of purchasing the remaining
interest in all 11 properties, exercisable for a designated period commencing
three (3) years after the respective closing dates on the initial purchases, for
additional consideration in the amount of approximately $2.1 million, all
payable in Units valued at $28.775 per Unit. If this option is exercised, total
consideration paid and to be paid for sole ownership of all 11 properties will
be approximately $142.47 million.
 
     (4) On October 7, 1997, the Operating Partnership purchased from an
unaffiliated party 10 and 30 South Wacker Drive, two 40-story office towers
totaling 2,033,377 net rentable square feet, in downtown Chicago, Illinois. The
purchase price of approximately $462 million was paid in cash.
 
     (5) On October 17, 1997, the Operating Partnership purchased from an
unaffiliated party One Lafayette Center, a 314,634 square-foot 10-story office
building, located in Washington, D.C. The purchase price of approximately $82.5
million was comprised of $24.4 million in Units issued at a net price of $32.975
per Unit, the assumption of approximately $5.3 million of liabilities and
approximately $52.8 million of cash.
 
     (6) In October, 1997, the Company's Board of Trustees approved the purchase
by the Operating Partnership of the following properties from an unaffiliated
party for approximately $92 million:
 
        - 1600 Duke, a 68,770 square foot office building, located in
          Alexandria, Virginia;
 
        - Fair Oaks Plaza, a 177,917 square foot office building, located in
          Fairfax, Virginia; and
 
        - Lakeside Square, a 392,537 square foot office building, located in
          Dallas, Texas.
 
     This transaction is contingent upon certain terms and conditions as set
forth in the purchase agreement. There can be no assurance that this transaction
will be consummated as described above.
 
     (7) In October, 1997, the Operating Partnership obtained a $1.5 billion
unsecured credit facility (the "Facility"). The Facility is available for the
acquisition of properties and general corporate purposes. The Facility carries
an interest rate equal to LIBOR plus 100 basis points and may be increased or
decreased upon the receipt of an investment grade unsecured debt rating. The
Facility matures on July 1, 1998, and may be extended to October 1, 1998. The
Operating Partnership paid an underwriting fee on the Facility at closing of
approximately $4,875,000. In addition, an unused commitment fee is payable
quarterly in arrears based upon the unused amount of the Facility as follows:
 .15% per annum if the unused amount is between 0 to 33%; .20% per annum if the
unused amount is more than 33% but less than 66%; and .25% per annum if the
unused amount is greater than 66%. As of November 14, 1997, the outstanding
balance on the Facility was approximately $1,044,450,000.
 
                                      F-35
<PAGE>   289
 
     (8) On October 20, 1997, the Company completed a private placement of
Common Shares with an unaffiliated party receiving approximately $200 million at
$30 per share.
 
     (9) In November, 1997, the Company's Board of Trustees approved the
purchase by the Operating Partnership of LaSalle Plaza, a 588,908 square foot
office building, located in Minneapolis, Minnesota, for approximately $97.4
million. This transaction is contingent upon certain terms and conditions as set
forth in the purchase agreement. There can be no assurance that this transaction
will be consummated as described above.
 
     (10) In November, 1997, the Company's Board of Trustees approved the
purchase by the Operating Partnership of the Stanwix Parking Facility, a parking
facility consisting of approximately 712 spaces, located in Pittsburgh,
Pennsylvania for approximately $17.3 million. This transaction is contingent
upon the satisfactory completion of the Company's due diligence and certain
other terms and conditions. There can be no assurance that this transaction will
be consummated as described above.
 
     (11) The table below summarized the issuance of Operating Partnership Units
at the Offering through November 14, 1997:
 
<TABLE>
<CAPTION>
                        TRANSACTION                            DATE        UNITS
                        -----------                           -------   -----------
<S>                                                           <C>       <C>
Outstanding upon completion of the Offering(A)..............  7/11/97   163,555,677
Units issued to seller of Properties (Note 8)...............   9/3/97     1,692,546
Restricted Share Awards to Officers.........................  9/22/97       119,000
Shares issued as Trustee compensation.......................  9/30/97         2,424
                                                                        -----------
Outstanding as of September 30, 1997........................  9/30/97   165,369,647
Common Shares and Units issued to seller of Properties (Note
  17 (1))...................................................  10/7/97     5,918,367
Units issued to seller of Properties (Note 17 (3))..........  10/7/97       499,977
Units issued to seller of Properties (Note 17 (5))..........  10/17/97      741,159
Private placement (Note 17 (8)).............................  10/20/97    6,666,667
                                                                        -----------
Outstanding as of November 14, 1997.........................            179,195,817
                                                                        ===========
</TABLE>
 
- ---------------
 
(A) Excludes 502,740 common shares held by the Operating Partnership which are
    deemed not to be outstanding for accounting purposes and are eliminated in
    consolidation.
 
                                      F-36
<PAGE>   290
 
                         REPORT OF INDEPENDENT AUDITORS
 
To the Owners of
the Equity Office Predecessors
 
     We have audited the accompanying combined balance sheets of the Equity
Office Predecessors, as defined in Note 1, as of December 31, 1996 and 1995, and
the related combined statements of operations, owners' equity, and cash flows
for each of the three years in the period ended December 31, 1996. Our audits
also included the financial statement schedule III, Real Estate and Accumulated
Depreciation. These financial statements and schedule are the responsibility of
the management of the Equity Office Predecessors. Our responsibility is to
express an opinion on these financial statements and schedule based on our
audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the combined financial position of the Equity Office
Predecessors at December 31, 1996 and 1995, and the combined results of its
operations and its cash flows for each of the three years in the period ended
December 31, 1996, in conformity with generally accepted accounting principles.
Also, in our opinion, the related financial statement schedule, when considered
in relation to the basic financial statements taken as a whole, presents fairly
in all material respects the information set forth therein.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
March 25, 1997
 
                                      F-37
<PAGE>   291
 
                           EQUITY OFFICE PREDECESSORS
 
                            COMBINED BALANCE SHEETS
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                    DECEMBER 31,
                                                              -------------------------
                                                                 1996           1995
                                                              ----------     ----------
                                                                   (IN THOUSANDS)
<S>                                                           <C>            <C>
Investment in real estate...................................  $3,549,708     $2,571,851
Accumulated depreciation....................................    (257,893)      (178,448)
                                                              ----------     ----------
                                                               3,291,815      2,393,403
Cash and cash equivalents...................................     410,420        111,121
Rents and other receivables (net of allowance for doubtful
  accounts of $2,724 and $2,075, respectively)..............      58,661         38,974
Escrow deposits and restricted cash.........................      32,593         20,360
Investment in unconsolidated joint ventures.................      26,910         26,505
Other assets (net of accumulated amortization of $21,806 and
  $14,721, respectively)....................................      92,166         60,527
                                                              ----------     ----------
          TOTAL ASSETS......................................  $3,912,565     $2,650,890
                                                              ==========     ==========
 
                            LIABILITIES AND OWNERS' EQUITY
 
Mortgage debt...............................................  $1,837,767     $1,358,827
Revolving line of credit....................................     127,125         76,000
Accounts payable and accrued expenses.......................      81,995         62,754
Due to affiliates...........................................       2,074            839
Distribution payable........................................      96,500         12,508
Other liabilities...........................................      29,022         18,406
                                                              ----------     ----------
          TOTAL LIABILITIES.................................   2,174,483      1,529,334
                                                              ----------     ----------
Commitments and contingencies (Note 11)
Minority interests..........................................      11,080         31,587
Owners' equity..............................................   1,727,002      1,089,969
                                                              ----------     ----------
          TOTAL LIABILITIES AND OWNERS' EQUITY..............  $3,912,565     $2,650,890
                                                              ==========     ==========
</TABLE>
 
                            See accompanying notes.
 
                                      F-38
<PAGE>   292
 
                           EQUITY OFFICE PREDECESSORS
 
                       COMBINED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                      YEARS ENDED DECEMBER 31,
                                                                ------------------------------------
                                                                  1996          1995          1994
                                                                --------      --------      --------
                                                                           (IN THOUSANDS)
<S>                                                             <C>           <C>           <C>
Revenues:
  Rental....................................................    $386,481      $289,320      $193,046
  Tenant reimbursements.....................................      62,036        41,935        27,200
  Parking...................................................      27,253        15,390         6,920
  Other.....................................................      17,626        10,314         3,262
  Fees from noncombined affiliates..........................       5,120         5,899         6,018
  Interest..................................................       9,608         8,599         4,432
                                                                --------      --------      --------
         Total Revenues.....................................     508,124       371,457       240,878
                                                                --------      --------      --------
Expenses:
  Interest:
    Expense incurred........................................     119,595       100,566        59,316
    Amortization of deferred financing costs................       4,275         2,025         1,568
  Depreciation..............................................      82,905        64,716        40,812
  Amortization..............................................       9,057         7,415         4,525
  Real estate taxes and insurance...........................      57,045        41,330        30,014
  Repairs and maintenance...................................      71,156        53,618        35,260
  Property operating........................................      72,866        56,540        42,138
  General and administrative................................      23,145        21,987        15,603
  Provision for value impairment............................          --        20,248            --
                                                                --------      --------      --------
         Total expenses.....................................     440,044       368,445       229,236
                                                                --------      --------      --------
Income before (income) loss allocated to minority interests,
  income from investment in unconsolidated joint ventures,
  gain on sale of real estate and extraordinary items.......      68,080         3,012        11,642
(Income) loss allocated to minority interests, net of
  extraordinary gain of $20,035 in 1995.....................      (2,086)       (2,129)        1,437
Income from unconsolidated joint ventures...................       2,093         2,305         1,778
Gain on sale of real estate.................................       5,338            --            --
                                                                --------      --------      --------
Income before extraordinary items...........................      73,425         3,188        14,857
Extraordinary items.........................................          --        31,271         1,705
                                                                --------      --------      --------
Net income..................................................    $ 73,425      $ 34,459      $ 16,562
                                                                ========      ========      ========
</TABLE>
 
                            See accompanying notes.
 
                                      F-39
<PAGE>   293
 
                           EQUITY OFFICE PREDECESSORS
 
                     COMBINED STATEMENTS OF OWNERS' EQUITY
 
<TABLE>
<CAPTION>
                                                              FOR THE YEARS ENDED
                                                              DECEMBER 31, 1996,
                                                                 1995 AND 1994
                                                              -------------------
                                                                (IN THOUSANDS)
<S>                                                           <C>
Owners' Equity, January 1, 1994.............................      $  488,627
  Contributions.............................................         251,909
  Offering expenses.........................................            (942)
  Distributions.............................................         (25,058)
  Net income for the year ended December 31, 1994...........          16,562
                                                                  ----------
Owners' Equity, December 31, 1994...........................         731,098
  Contributions.............................................         337,048
  Offering expenses.........................................            (128)
  Distributions.............................................         (12,508)
  Net income for the year ended December 31, 1995...........          34,459
                                                                  ----------
Owners' Equity, December 31, 1995...........................       1,089,969
  Contributions.............................................         661,265
  Offering expenses.........................................          (1,157)
  Distributions.............................................         (96,500)
  Net income for the year ended December 31, 1996...........          73,425
                                                                  ----------
Owners' Equity, December 31, 1996...........................      $1,727,002
                                                                  ==========
</TABLE>
 
                            See accompanying notes.
 
                                      F-40
<PAGE>   294
 
                           EQUITY OFFICE PREDECESSORS
 
                       COMBINED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                     YEARS ENDED DECEMBER 31,
                                                                -----------------------------------
                                                                  1996         1995         1994
                                                                ---------    ---------    ---------
                                                                          (IN THOUSANDS)
<S>                                                             <C>          <C>          <C>
OPERATING ACTIVITIES:
  Net income................................................    $  73,425    $  34,459    $  16,562
  Adjustments to reconcile net income to net cash provided
    by operating activities:
    Depreciation and amortization...........................       96,237       74,156       46,905
    (Income) from investment in unconsolidated joint
      venture...............................................       (2,093)      (2,305)      (1,778)
    (Gain) on sale of real estate...........................       (5,338)          --           --
    Provision for value impairment..........................           --       20,248           --
    Extraordinary (gain) from early extinguishments of
      debt..................................................           --           --       (1,705)
    Extraordinary (gain) on repurchase of debt..............           --      (31,271)          --
    Provision for doubtful accounts.........................        2,284        2,096          572
    Income (loss) allocated to minority interests...........        2,086        2,129       (1,437)
    Changes in assets and liabilities:
       (Increase) in rents receivable.......................      (21,971)     (17,411)      (8,552)
       (Increase) decrease in other assets..................       (9,747)       1,374       (3,124)
       Increase in accounts payable and accrued expenses....       19,241        6,931       19,382
       Increase (decrease) in due to affiliates.............        1,235          (89)         293
       Increase in other liabilities........................       10,616        3,561        6,703
                                                                ---------    ---------    ---------
         Net cash provided by operating activities..........      165,975       93,878       73,821
                                                                ---------    ---------    ---------
INVESTING ACTIVITIES:
  Property acquisitions.....................................     (768,906)    (317,669)    (351,489)
  Payments for capital and tenant improvements..............     (129,485)     (76,985)     (72,952)
  Proceeds from sale of real estate.........................       14,502           --           --
  Distributions from (investment in) unconsolidated joint
    venture.................................................        1,688        2,300      (24,722)
  Payments of lease acquisition costs.......................      (29,793)     (16,106)     (22,883)
  (Increase) decrease in escrow deposits and restricted
    cash....................................................      (12,233)      27,845      (41,919)
                                                                ---------    ---------    ---------
         Net cash (used for) investing activities...........     (924,227)    (380,615)    (513,965)
                                                                ---------    ---------    ---------
FINANCING ACTIVITIES:
  Capital contributions.....................................      661,265      337,048      251,909
  Capital distributions.....................................      (12,508)     (17,800)      (8,458)
  Payments for offering expenses............................       (1,157)        (128)        (942)
  Contributions from (distributions to) minority interest
    partners................................................      (22,593)         141       26,018
  Proceeds from mortgage notes..............................      640,953      271,482      240,365
  Proceeds from revolving lines of credit...................      216,943      288,000      166,000
  Repurchase of debt........................................           --      (40,078)          --
  Principal payments on mortgage notes......................     (254,104)    (182,244)    (152,615)
  Principal payments on revolving line of credit............     (165,818)    (378,000)          --
  Payments of loan costs....................................       (5,430)      (1,908)      (6,854)
  Prepayment penalties on early extinguishments of debt.....           --           --         (500)
                                                                ---------    ---------    ---------
         Net cash provided by financing activities..........    1,057,551      276,513      514,923
                                                                ---------    ---------    ---------
Net (decrease) increase in cash and cash equivalents........      299,299      (10,224)      74,779
Cash and cash equivalents at the beginning of the year......      111,121      121,345       46,566
                                                                ---------    ---------    ---------
Cash and cash equivalents at the end of the year............    $ 410,420    $ 111,121    $ 121,345
                                                                =========    =========    =========
Supplemental information:
  Interest paid during the period, including capitalized
    interest of $4,640, $1,682 and $0, respectively.........    $ 121,813    $ 100,700    $  55,832
                                                                =========    =========    =========
  Non-cash financing activities:
    Financing assumed upon acquisition of real estate.......    $  92,091    $ 265,816    $ 211,263
                                                                =========    =========    =========
</TABLE>
 
                            See accompanying notes.
 
                                      F-41
<PAGE>   295
 
                           EQUITY OFFICE PREDECESSORS
 
                     NOTES TO COMBINED FINANCIAL STATEMENTS
 
NOTE 1 -- BUSINESS AND ORGANIZATION
 
     Unless defined otherwise herein, capitalized terms used in these notes to
the combined financial statements have the same meanings as defined elsewhere in
this Registration Statement on Form S-4. These footnotes should be read in
conjunction with the Registration Statement on Form S-4. As used herein, "Equity
Office Predecessors" has the same meaning as EOP Predecessors.
 
  Business
 
     Prior to July 11, 1997, Equity Office Predecessors was engaged in
acquiring, owning, managing, leasing, and renovating office properties and
parking facilities throughout the United States. The Management Business
included activities related to both the management of properties owned by Equity
Office Predecessors (the "Properties") as well as properties which were owned by
entities affiliated with Equity Office Predecessors. Equity Office Properties
Trust (the "Company") is the successor to the business of Equity Office
Predecessors.
 
  Organization
 
     Equity Office Predecessors is not a legal entity, but rather a combination
of the Properties of the ZML Opportunity Partnerships together with their
limited and general partners (collectively, the "ZML Funds" which includes ZML
Fund I, ZML Fund II, ZML Fund III and ZML Fund IV), and the Management Business
of the Equity Group that were combined into the Company pursuant to the
Consolidation and the Offering. The combined financial statements include all
the direct and indirect costs of the business of Equity Office Predecessors. The
business of the apartment and retail properties owned by the ZML Funds (the
"Non-Office Properties") have not been included in these combined financial
statements.
 
NOTE 2 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
  Basis of Presentation
 
     The combined financial statements have been presented on a combined basis,
at historical cost, because the ZML Funds and the Management Business were under
the common control and management of the owners of the Equity Group through
general partnership interests in the ZML Funds and through their ownership of
the Management Business. Minority interests have been recorded for those
entities that were not wholly owned by the ZML Funds. Where controlling
interests were not held by the ZML Funds, the entities were accounted for as
investments in unconsolidated joint ventures utilizing equity accounting. All
significant intercompany transactions and balances have been eliminated in
combination.
 
  Capital Contributions/Distributions
 
     As of December 31, 1996, the capital partners of the four ZML Funds
previously committed to contribute approximately $2,113,947,500, of which
approximately $1,844,490,800 had been cumulatively contributed by capital
partners, approximately $82,661,700 of the commitment had been canceled and
approximately $186,795,000 remained uncalled.
 
     As of December 31, 1996, the ZML Funds had cumulatively declared or
distributed approximately $139,045,900 to their capital partners.
 
     As of December 31, 1996, the net book value of the Non-Office Properties,
consisting of 14 apartment buildings and two shopping center, which are not
included in these combined financial statements, was approximately $285,920,700.
All cash deficits incurred by the Non-Office Properties are reflected as
distributions and all excess cash flow generated by the Non-Office Properties,
including net proceeds from the sale of these properties, are reflected as
contributions to Equity Office Predecessors. The net contributions
(distributions) for the years ended December 31, 1996, 1995 and 1994 related to
the Non-Office Properties was approximately $98,780,000, $908,000 and
($7,258,000), respectively.
 
                                      F-42
<PAGE>   296
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     During 1996, two Non-Office Properties were sold which generated net
proceeds of approximately $96,664,000 which is included in the $98,780,000 net
contributions from Non-Office Properties for the year ended December 31, 1996.
 
  Investment in Real Estate
 
     Investment in real estate, including Equity Office Predecessors' office
properties (the "Office Properties") and Equity Office Predecessors' parking
facilities (the "Parking Facilities"), was as follows:
 
<TABLE>
<CAPTION>
                                                                    DECEMBER 31,
                                                              ------------------------
                                                                 1996          1995
                                                              ----------    ----------
<S>                                                           <C>           <C>
Land........................................................  $  314,370    $  235,581
Building....................................................   2,871,690     2,099,391
Building improvements.......................................     161,497        85,737
Tenant improvements.........................................     196,093       146,966
Furniture and fixtures......................................       6,058         4,176
                                                              ----------    ----------
                                                               3,549,708     2,571,851
Accumulated depreciation....................................    (257,893)     (178,448)
                                                              ----------    ----------
                                                              $3,291,815    $2,393,403
                                                              ==========    ==========
</TABLE>
 
     Rental property and improvements, including costs capitalized during
construction and other costs incurred are included in investment in real estate
and are stated at cost. Expenditures for ordinary maintenance and repairs are
expensed to operations as they are incurred. Significant renovations and
improvements which improve or extend the useful life of the assets are
capitalized. Except for amounts attributed to land, rental property and
improvements are depreciated over their estimated useful lives using the
straight-line method. The estimated useful lives by asset category are:
 
<TABLE>
<CAPTION>
                     ASSET CATEGORY                         ESTIMATED USEFUL LIFE
                     --------------                         ---------------------
<S>                                                         <C>
Building................................................    40 years
Building improvements...................................    4-40 years
Tenant improvements.....................................    Term of lease
Furniture and fixtures..................................    3-12 years
</TABLE>
 
     During 1995, the Financial Accounting Standards Board issued Statement No.
121 "Accounting for the Impairment of Long-Lived Assets and for Long-Lived
Assets to Be Disposed Of" ("Statement No. 121") which established accounting
standards for the evaluation of the potential impairment of such assets. This
statement was adopted by Equity Office Predecessors as of January 1, 1995.
Rental properties are individually evaluated for impairment when conditions
exist which may indicate that it is probable that the sum of expected future
cash flows (on an undiscounted basis) from a rental property are less than its
historical net cost basis. Upon determination that a permanent impairment has
occurred, rental properties are reduced to their fair value. During the year
ended December 31, 1995, Equity Office Predecessors recorded a provision for
value impairment of approximately $20,248,500, of which $17,512,000 related to
the adjustment of investment in real estate and approximately $2,736,500 related
to unamortized lease acquisition costs.
 
     For properties to be disposed of, an impairment loss is recognized when the
fair value of the property, less the estimated cost to sell, is less than the
carrying amount of the property measured at the time Equity Office Predecessors
has a commitment to sell the property and/or is actively marketing the property
for sale. Property to be disposed of is reported at the lower of its carrying
amount or its estimated fair value, less its cost to sell. Subsequent to the
date that a property is held for disposition, depreciation expense is not
provided for in the statement of operations.
 
                                      F-43
<PAGE>   297
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
  Lease Acquisition Costs
 
     Capitalized lease acquisition costs are recorded at cost and are included
in other assets. These costs are amortized over the respective terms of the
leases. Lease acquisition costs, net of accumulated amortization of $18,455,000
and $12,281,900, as of December 31, 1996 and 1995, respectively, were
approximately $62,592,700 and $40,913,700, respectively.
 
  Loan Costs
 
     Capitalized loan costs are recorded at cost and are included in other
assets. These costs are amortized over the term of the respective financings on
a straight-line basis, which approximates the effective yield method. Loan
costs, net of accumulated amortization of $3,351,000 and $2,438,700, as of
December 31, 1996 and 1995, respectively, were approximately $8,372,300 and
$7,217,100, respectively.
 
  Rental Income
 
     Certain leases of Office Properties provide for tenant occupancy during
periods for which no rent is due or where minimum rent payments increase during
the term of the lease. Equity Office Predecessors records rental income for the
full term of each lease on a straight-line basis. As of December 31, 1996 and
1995, the receivables from tenants, net of reserves, which Equity Office
Predecessors expects to collect over the remaining term of these leases rather
than currently were approximately $49,986,100 and $31,558,700, respectively
("Deferred Rent"). The amounts included in rental income for the years ended
December 31, 1996 and 1995, which are not currently collectible, were
approximately $18,427,400 and $12,662,600, respectively. Deferred Rent is not
recognized for income tax purposes.
 
  Cash Equivalents
 
     Cash equivalents are considered to be all highly liquid investments
purchased with a maturity of three months or less. In addition, cash equivalents
include deposits made to a commingled bank account which is held in an
affiliate's name. Such affiliate provides centralized cash management services
to Equity Office Predecessors.
 
  Escrow Deposits
 
     Escrow deposits primarily consist of amounts held by lenders to provide for
future real estate tax expenditures, tenant improvements and earnest money
deposits on acquisitions.
 
  Restricted Cash
 
     Restricted cash represents amounts committed for various utility deposits
and security deposits. Certain of these amounts may be reduced upon the
fulfillment of certain obligations.
 
  Fair Value of Financial Instruments
 
     Management believes that the carrying basis of Equity Office Predecessors'
long-term debt, consisting of mortgage loans, revolving bank loans and various
interest rate protection agreements, approximated their respective fair market
values as of December 31, 1996 and 1995. The current value of debt was computed
by discounting the projected debt service payments for each loan based on the
spread between the market rate and the effective rate, including the
amortization of loan origination costs, for each year. In addition, the carrying
values of cash and cash equivalents, restricted cash, escrow deposits, rents
receivable (excluding Deferred Rent), accounts payable and accrued expenses are
reasonable estimates of their fair value.
 
                                      F-44
<PAGE>   298
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
  Interest Rate Protection Agreements
 
     Equity Office Predecessors periodically enters into certain interest rate
protection agreements to effectively convert or cap floating rate debt to a
fixed rate basis, as well as to hedge anticipated finance transactions. Net
amounts paid or received under these agreements are recognized as an adjustment
to interest expense when such amounts are incurred or earned. Settlement amounts
paid or received in connection with terminated interest rate protection
agreements are deferred and amortized over the term of the related financing
transaction on the straight-line method, which approximates the effective yield
method.
 
  Income Taxes
 
     The Office Properties, Parking Facilities and the Management Business are
primarily owned in limited partnerships or limited liability companies, which
are substantially pass-through entities. Some of these pass-through entities
have corporate general partners or members, which are subject to Federal and
state income and franchise taxes. Equity Office Predecessors incurred Federal
and state income and franchise taxes of approximately $1,375,000 and $1,578,100
for the years ended December 31, 1996 and 1995, respectively, which are included
in general and administrative expenses.
 
     The results of Equity Office Predecessors are included in the income tax
returns of the owners and, accordingly, the income tax obligations of the owners
have not been reflected in these financial statements.
 
  Reclassification
 
     Certain reclassifications have been made to the previously reported 1995
and 1994 statements in order to provide comparability with the 1996 statements
reported herein. These reclassifications have not changed the 1995 and 1994
results or Owners' Equity.
 
  Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting periods. Actual results could differ from those estimates.
 
NOTE 3 -- MORTGAGE DEBT AND REVOLVING LINE OF CREDIT:
 
  Fixed Rate Debt
 
     As of December 31, 1996 and 1995, Equity Office Predecessors had
outstanding fixed rate mortgage indebtedness of approximately $1,304,075,400 and
$900,912,800, respectively. Payments on fixed rate mortgage debt are generally
due in monthly installments of principal and interest or interest only. As of
December 31, 1996 and 1995, fixed interest rates ranged from 6.88% to 10% and
6.75% to 10.25%, respectively. The weighted average fixed interest rate was
approximately 7.89% and 8.01% as of December 31, 1996 and 1995, respectively.
 
  Variable Rate Debt
 
     As of December 31, 1996 and 1995, Equity Office Predecessors had
outstanding variable rate mortgage indebtedness of approximately $533,691,500
and $457,914,100, respectively. Payments on variable rate mortgage debt are
generally due in monthly installments of principal and interest or interest
only. As of December 31, 1996 and 1995, variable interest rates ranged from
6.56% (LIBOR + 1%) to 7.83% (LIBOR + 2.25%) and 6.75% (LIBOR + 1%) to 10.28%
(LIBOR + 4.375%), respectively. The weighted
 
                                      F-45
<PAGE>   299
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
average variable interest rate was approximately 7.35% and 7.72% as of December
31, 1996 and 1995, respectively.
 
  Lines of Credit
 
     As of December 31, 1996 and 1995, Equity Office Predecessors had amounts
outstanding under lines of credit of approximately $127,125,000 and $76,000,000,
respectively. A $200 million line of credit ("$200 M Line") was obtained in
October 1994 and canceled in September 1996. Interest was payable monthly based
on the LIBOR + .625%. The $200 M line was secured by the capital commitments of
certain investors and was used to finance acquisitions.
 
     A $275 million acquisition and term loan facility was obtained in September
1996 with a maturity in September 1999 for the purpose of providing financing
for acquisitions. Interest only was payable monthly with the interest based on
various LIBOR options plus various spreads ranging from 1.375% to 1.625% or the
prime rate.
 
  Draw Facilities
 
     As stated in the respective loan agreements, Equity Office Predecessors has
the ability to draw additional proceeds on certain of its mortgages for
operating deficits, capital and tenant improvements, and lease acquisition
costs. As of December 31, 1996 and 1995, amounts available to draw under these
mortgage notes were approximately $92,577,200 and $134,218,100, respectively.
 
  Interest Rate Protection Agreements
 
     In order to limit the market risk associated with variable rate debt,
Equity Office Predecessors entered into several interest rate protection
agreements. (1) A $73,000,000, 8% interest rate protection agreement based on
the three-month LIBOR at a total cost of 2.05% payable in quarterly installments
of approximately $66,600 was entered into in August 1993 and expires on August
14, 2000. A $100,000,000, 7% interest rate protection agreement based on a
three-month LIBOR at a total cost of 1.67% payable in quarterly installments of
approximately $97,600 was entered into in August, 1993 and expires on August 12,
1998. (2) An interest rate protection agreement in October, 1995 which fixes the
interest rate on a $93,600,000 loan at 6.94% through June 30, 2000. Amounts paid
under this interest rate protection agreement for the years ended December 31,
1996 and 1995 were approximately $463,400 and $16,200, respectively. The costs
associated with these interest rate protection agreements have been included in
interest expense. (3) Two interest rate protection agreements totaling
$179,500,000 as a hedge on two mortgages loans. The interest rate protection
agreements were terminated in 1996 at a net cost to Equity Office Predecessors
of approximately $110,000. This amount is being amortized as interest expense
over the term of the respective mortgage loans.
 
     Scheduled payments of principal on mortgage debt and the revolving line of
credit for each of the next five years and thereafter, as of December 31, 1996,
are as follows:
 
<TABLE>
<S>                                                           <C>
1997........................................................  $   73,000,200
1998........................................................      97,588,500
1999........................................................     483,993,300
2000........................................................     255,470,900
2001........................................................     222,219,800
Thereafter..................................................     832,619,200
                                                              --------------
                                                              $1,964,891,900
                                                              ==============
</TABLE>
 
                                      F-46
<PAGE>   300
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE 4 -- EXTRAORDINARY ITEMS AND PROVISION FOR VALUE IMPAIRMENT:
 
     As reflected in the Combined Statement of Operations for the year ended
December 31, 1995, Equity Office Predecessors reported an extraordinary gain of
approximately $31,270,800 on the repurchase of debt, which is net of the
$20,034,600 minority partners' share, and a provision for value impairment of
approximately $20,248,500 related to Equity Office Predecessors' investment in
San Felipe Plaza Ltd.
 
     As reflected in the Combined Statement of Operations for the year ended
December 31, 1994, Equity Office Predecessors repaid the mortgage notes relating
to two properties at a 10% discount resulting in a gain on early extinguishment
of debt of approximately $1,704,900, which was net of approximately $499,900 in
prepayment penalties and the write-off of $547,600 of unamortized loan costs
incurred in connection with the refinancing of certain of Equity Office
Predecessors' properties.
 
NOTE 5 -- INVESTMENT IN UNCONSOLIDATED JOINT VENTURES:
 
     Equity Office Predecessors acquired a mortgage receivable secured by the
500 Orange Tower office property ("500 Orange") and purchased land underlying
and adjacent to 500 Orange in July 1994. The transaction was accounted for
utilizing the equity method of accounting. Under this method of accounting, the
net equity investment of Equity Office Predecessors is reflected on the combined
balance sheets, and the combined statements of operations include Equity Office
Predecessors' share of net income or loss from 500 Orange. The Company's share
of net income or loss from 500 Orange is approximately 100%. Selected balance
sheets and statements of operations data for Equity Office Predecessors'
interest in 500 Orange are as follows:
 
<TABLE>
<CAPTION>
                                                                        500 ORANGE TOWER
                                                                ---------------------------------
                                                                DEC. 31, 1996       DEC. 31, 1995
                                                                -------------       -------------
                                                                         (IN THOUSANDS)
<S>                                                             <C>                 <C>
ASSETS:
  Investment in real estate, net............................       $26,555             $26,281
  Cash and cash equivalents.................................           147                 158
  Rents and other receivables...............................           150                  74
  Other assets..............................................           720                 438
                                                                   -------             -------
     TOTAL ASSETS...........................................       $27,572             $26,951
                                                                   =======             =======
LIABILITIES AND OWNERS' EQUITY:
  Accounts payable and accrued expenses.....................       $   364             $   248
  Due to affiliates.........................................            19                  39
  Other liabilities.........................................           279                 159
                                                                   -------             -------
     TOTAL LIABILITIES......................................           662                 446
                                                                   -------             -------
  Owners' equity............................................        26,910              26,505
                                                                   -------             -------
     TOTAL LIABILITIES AND OWNERS' EQUITY...................       $27,572             $26,951
                                                                   =======             =======
</TABLE>
 
                                      F-47
<PAGE>   301
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                          500 ORANGE TOWER
                                                          ------------------------------------------------
                                                                            YEARS ENDED
                                                          ------------------------------------------------
                                                          DECEMBER 31,      DECEMBER 31,      DECEMBER 31,
                                                              1996              1995              1994
                                                          ------------      ------------      ------------
                                                                           (IN THOUSANDS)
<S>                                                       <C>               <C>               <C>
Revenues:
  Rental..............................................       $4,643            $4,935            $3,089
  Tenant reimbursements...............................           85               127                56
  Parking.............................................           --                --                --
  Other...............................................                            (60)               --
                                                             ------            ------            ------
     Total revenues...................................        4,775             5,002             3,145
                                                             ------            ------            ------
Expenses:
  Interest............................................           --                --                --
  Depreciation........................................          730               679               295
  Amortization........................................          100                23                --
  Real estate taxes and insurance.....................          372               540               250
  Repairs and maintenance.............................          718               530               324
  Property operating..................................          762               925               498
                                                             ------            ------            ------
     Total expenses...................................        2,682             2,697             1,367
                                                             ------            ------            ------
Net income............................................       $2,093            $2,305            $1,778
                                                             ======            ======            ======
</TABLE>
 
NOTE 6 -- MINORITY INTEREST
 
     The following properties are controlled and partially owned by Equity
Office Predecessors but have partners with minority interests. Equity Office
Predecessors has included 100% of the financial condition and results of
operations of these properties in the Combined Financial Statements of Equity
Office Predecessors. The equity interests by the unaffiliated partners are
reflected as minority interest.
 
<TABLE>
<CAPTION>
                                                                EQUITY OFFICE
                                                                 PREDECESSOR
                                                               OWNERSHIP AS OF
                          PROPERTY                            DECEMBER 31, 1996
                          --------                            -----------------
<S>                                                           <C>
CIGNA Center................................................          95%(1)
Plaza at La Jolla Village...................................       66.67%(1)
First Union Center..........................................          97%(2)
San Felipe Plaza............................................          35%(3)
Capital Commons Garage......................................          50%(4)
</TABLE>
 
- ---------------
 
(1) Equity Office Predecessors owns a controlling interest and is the managing
    general partner.
 
(2) Equity Office Predecessors owns a controlling interest and receives
    preferential allocations.
 
(3) An affiliate of Equity Office Predecessors was the managing general partner
    of the limited partnership holding title to the property and controlled the
    major operating and financing decisions of the property. Equity Office
    Predecessors receives preferential allocations which result in Equity Office
    Predecessors receiving 100% of the economic benefits.
 
(4) Equity Office Predecessors owns a controlling interest and receives
    preferential allocations. The unaffiliated partner is entitled to receive
    50% of the remaining cash flow after Equity Office Predecessors receives its
    preferential allocations.
 
     In addition to the properties listed above, Equity Office Predecessors owns
certain other properties, and has a controlling interest in such properties,
subject to minority or participating interests. Equity Office
 
                                      F-48
<PAGE>   302
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
Predecessors is entitled to 100% of the economic benefits of these properties
subject to diminution after Equity Office Predecessors receives specified
preferential returns. Accordingly, no minority interests are reflected for these
unaffiliated parties.
 
NOTE 7 -- FUTURE MINIMUM RENTS:
 
     Future minimum rental receipts due on noncancelable operating leases at the
Office Properties and Parking Facilities as of December 31, 1996 were as
follows:
 
<TABLE>
<S>                                                           <C>
1997........................................................  $  452,618,100
1998........................................................     425,503,500
1999........................................................     378,930,400
2000........................................................     324,634,500
2001........................................................     261,674,200
Thereafter..................................................   1,069,271,200
                                                              --------------
                                                              $2,912,631,900
                                                              ==============
</TABLE>
 
     Equity Office Predecessors is subject to the usual business risks
associated with the collection of the above scheduled rents.
 
     Equity Office Predecessors' investment in 500 Orange is accounted for
utilizing the equity method. Future minimum rental receipts for this Office
Property have not been included in the above schedule.
 
NOTE 8 -- FUTURE MINIMUM LEASE PAYMENTS:
 
     As of December 31, 1996, Equity Office Predecessors' ownership of three of
its Office Properties and two of its Parking Facilities are subject to ground
leases. As disclosed in their respective ground lease agreements, certain of
these leases are subject to rental increases based upon the appraised value of
the property at specified dates or certain financial calculations of the
respective property. As disclosed in Note 9, Equity Office Predecessors leases
its office space from an affiliate. In addition, Equity Office Predecessors has
assumed lease obligations of certain of their tenants at their former locations.
Future minimum lease obligations under these noncancelable leases, net of
sublease rental income, as of December 31, 1996 were as follows:
 
<TABLE>
<S>                                                           <C>
1997........................................................  $  2,554,700
1998........................................................     2,484,100
1999........................................................     2,466,900
2000........................................................     2,381,400
2001........................................................     2,262,700
Thereafter..................................................   369,366,900
                                                              ------------
                                                              $381,516,700
                                                              ============
</TABLE>
 
     Rental expense, net of sublease rental income of approximately $955,000 and
$712,900 for the years ended December 31, 1996 and 1995 was approximately
$1,671,800 and $1,043,300, respectively.
 
                                      F-49
<PAGE>   303
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE 9 -- RELATED PARTY TRANSACTIONS:
 
     Affiliates provide various services to Equity Office Predecessors. Fees and
reimbursements paid by Equity Office Predecessors to affiliates for the years
ended December 31, 1996, 1995 and 1994 were as follows:
 
<TABLE>
<CAPTION>
                                                      PAID                         PAYABLE AS OF
                                     ---------------------------------------   ---------------------
                                            YEARS ENDED DECEMBER 31,               DECEMBER 31,
                                     ---------------------------------------   ---------------------
                                        1996          1995          1994          1996        1995
                                     -----------   -----------   -----------   ----------   --------
<S>                                  <C>           <C>           <C>           <C>          <C>
Acquisition Fees (A)...............  $ 3,067,800   $ 1,097,200   $ 5,818,900   $  586,700   $     --
Accounting and tax related
  services.........................      796,600       554,100       457,800       61,500     85,100
Legal fees and expenses(B).........    3,480,500     3,230,100     2,084,900    1,294,700    652,600
Office rent (C)....................      777,100       668,000       543,300           --         --
Disposition fees...................      124,400            --            --           --         --
Development fees (D)...............      702,100       437,500            --           --     43,800
Reimbursement of property insurance
  premiums.........................    5,032,000     3,735,100     2,498,900          200     24,500
Organizational and Offering
  Expenses(E)......................      777,600       179,700       515,100      105,600     16,200
Administrative services(F).........      821,600       608,700     1,635,200       20,600     16,800
Consulting.........................      274,000       409,700       204,100        4,700         --
                                     -----------   -----------   -----------   ----------   --------
                                     $15,853,700   $10,920,100   $13,758,200   $2,074,000   $839,000
                                     ===========   ===========   ===========   ==========   ========
</TABLE>
 
- ---------------
 
(A) Represents amounts paid to Merrill Lynch, a limited partner of the general
    partner of the ZML Funds.
 
(B) Represents amounts primarily paid to Rosenberg & Liebentritt, P.C. for legal
    fees and expenses in connection with acquisition, corporate, and leasing
    activity.
 
(C) Equity Office Predecessors leases its corporate office space from an
    affiliate of the Equity Group Owners. Significant terms of the lease are as
    follows:
 
<TABLE>
<S>                                       <C>
Term:                                     January 1, 1995 -- December 31, 2001
Total space leased:                       52,028 square feet
Base rent after December 31, 1996:
1997..............................................  $870,900
1998..............................................  $896,900
1999..............................................  $922,900
2000..............................................  $948,900
2001..............................................  $974,900
</TABLE>
 
     Additional rent: Tenant's pro rata share of certain additional landlord
     costs in excess of 1995 costs.
 
(D) The renovation project at the 28 State Street Office Building is being
    managed by an affiliate of the Equity Group Owners. In consideration for
    their services, the development managers are being paid fees which
    management believes are equal to or less than market for such services.
 
(E) Affiliates of the Equity Group Owners were reimbursed for reasonable costs
    incurred in connection with the organization and the offering of units in
    the ZML Funds, including legal and accounting fees and expenses, printing
    costs and filing fees.
 
(F) Administrative services include fees paid by Equity Office Predecessors to
    EGI for centralized services such as payroll processing, employee benefits,
    telecommunications, publications, and consulting services such as economic
    and demographics research for possible acquisitions.
 
                                      F-50
<PAGE>   304
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     An affiliate of the Equity Group Owners has an indirect interest in
Standard Parking Limited Partnership ("SPLP") which manages the parking
operations at certain Office Buildings that are owned by Equity Office
Predecessors. Management believes amounts paid to SPLP are equal to market for
such services.
 
  Amounts received and due from affiliates
 
     Affiliates of Equity Office Predecessors lease space in certain of the
Office Properties owned by Equity Office Predecessors. The provisions of the
leases are consistent with terms of unaffiliated tenants' leases. Total rents
and other amounts paid by affiliates under the terms of their respective leases
were approximately $3,471,500 and $2,657,500 for the years ended December 31,
1996 and 1995, respectively.
 
     Equity Office Predecessors provides asset and property management services
to certain non-combined office and garage properties owned by affiliates of the
Equity Group Owners. Amounts due for these services as of December 31, 1996 and
1995 were approximately $816,900 and $1,363,300, respectively.
 
     Equity Office Predecessors entered into various lease agreements with SPLP
whereby SPLP leased the North Loop Transportation Center Parking Facility, the
Milwaukee Center Parking Garage and the Boston Harbor Garage from Equity Office
Predecessors. Certain of these lease agreements provide SPLP with annual
successive options to extend the term of the lease through various dates. The
rent paid in the years ended December 31, 1996 and 1995 under these lease
agreements was approximately $3,161,500 and $1,691,600, respectively. In
addition, Equity Office Predecessors may receive additional rent based upon
actual gross revenues generated by these Parking Facilities. In accordance with
certain of these leases, Equity Office Predecessors may be obligated to make an
early termination payment if agreement is not reached as to rent amounts to be
paid.
 
NOTE 10 -- DISPOSITIONS:
 
     Three Lakeway is a mixed - use property, including a 210 room hotel and an
18-story office complex. In January, 1996, Equity Office Predecessors sold the
condominium portion of the property which comprised the hotel. The gross sale
price attributable to the land and building was approximately $14,800,000 and
the gain realized was approximately $5.3 million. Pursuant to the terms of the
loan collateralizing the property, approximately $10,617,500 of the sales
proceeds were applied to the outstanding note balances.
 
NOTE 11 -- COMMITMENTS AND CONTINGENCIES:
 
  Concentration of Credit Risk
 
     Equity Office Predecessors maintains its cash and cash equivalents at
financial institutions. The combined account balances at each institution
periodically exceeds FDIC insurance coverage, and, as a result, there is a
concentration of credit risk related to amounts on deposit in excess of FDIC
insurance coverage. Management of Equity Office Predecessors believes that the
risk is not significant. In addition, Equity Office Predecessors believes it has
limited exposure to the extent of non-performance by the swap counterparties
since each counterparty is a major U.S. financial institution, and management
does not anticipate their non-performance.
 
  Environmental
 
     Equity Office Predecessors, as an owner of real estate, is subject to
various environmental laws of Federal and local governments. Compliance by
Equity Office Predecessors with existing laws has not had a material adverse
effect on Equity Office Predecessors' financial condition and results of
operations, and management does not believe it will have such an impact in the
future. However, Equity Office Predecessors cannot predict the impact of new or
changed laws or regulations on its current properties or on properties that it
may acquire in the future.
 
                                      F-51
<PAGE>   305
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
  Litigation
 
     ZML-Chicago Parking Limited Partnership ("ZCP") and ZML-North Loop/Theatre
District Parking Limited Partnership ("NLT"), were named as defendants in an
action (the "Action") brought by an investor (the "Plaintiff") in an
unaffiliated entity owning an interest in NLT. The action was brought in the
Circuit Court of Cook County, Illinois, Chancery Division, on August 15, 1995.
NLT is the owner of two Parking Facilities, North Loop Transportation Center and
Theatre District Self Park ("Theatre District Garage"). The Plaintiff demanded
recision of certain transactions related to the acquisition by NLT of the
Theatre District Garage.
 
     During 1996, Equity Office Predecessors and certain other parties filed
actions (the "Lawsuit") against Rockefeller Center Properties, Inc. ("RCPI")
seeking specific performance of certain agreements between the parties. In
November, 1996, the parties settled all matters related to the Lawsuit. The
settlement provided that RCPI pay approximately $10,274,000, of which Equity
Office Predecessors was entitled to and received approximately $8,806,500, net
of expenses, which has been recorded as other income.
 
     Except as described above, management of Equity Office Predecessors does
not believe there is any litigation threatened against Equity Office
Predecessors other than routine litigation arising out of the ordinary course of
business, some of which is expected to be covered by liability insurance, none
of which is expected to have a material adverse effect on the combined financial
statements of Equity Office Predecessors.
 
NOTE 12 -- SUBSEQUENT EVENTS
 
     The following significant transactions relating to Equity Office
Predecessors occurred during the period from January 1, 1997 to July 10, 1997:
 
Acquisition Activities
 
     1) In January, 1997, Equity Office Predecessors, through its subsidiaries,
        purchased from an unaffiliated third party 177 Broad Street and Biltmore
        Apartments, a mixed-use property located in Stamford, Connecticut. The
        all cash purchase of approximately $36,450,000 includes acquisition
        related expenses.
 
     2) In March, 1997, Equity Office Predecessors, through its subsidiaries,
        purchased from an unaffiliated third party Preston Commons, an office
        building located in Dallas, Texas. The all cash purchase price of
        approximately $55,200,000 includes acquisition related expenses.
 
     3) In April, 1997, Equity Office Predecessors, through its subsidiaries,
        purchased from an unaffiliated third party Oakbrook Terrace Tower, an
        office building located in Oakbrook Terrace, Illinois. The all cash
        purchase price of approximately $130,100,000 includes acquisition
        related expenses.
 
     4) In April, 1997, Equity Office Predecessors, through its subsidiaries,
        purchased from an unaffiliated third party One Maritime Plaza, an office
        building located in San Francisco, California. The all cash purchase
        price of approximately $99,400,000 includes acquisition related
        expenses.
 
     5) In April, 1997, Equity Office Predecessors, through its subsidiaries,
        purchased from an unaffiliated third party Smith Barney Tower, an office
        building located in San Diego, California. The all cash purchase price
        of approximately $35,100,000 includes acquisition related expenses.
 
     6) In April, 1997, Equity Office Predecessors, through its subsidiaries,
        purchased from an unaffiliated third party 201 Mission Street, an office
        building located in San Francisco, California. The all cash purchase
        price of approximately $74,700,000 includes acquisition related
        expenses.
 
                                      F-52
<PAGE>   306
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     7) In June, 1997, Equity Office Predecessors, through its subsidiaries,
        purchased from an unaffiliated third party 30 N. LaSalle, an office
        building located in Chicago, Illinois. The all cash purchase price of
        approximately $100,700,000 includes acquisition related expenses.
 
  Disposition Activities
 
     1) In January, 1997, Equity Office Predecessors sold Barton Oaks Plaza II
        for a gross sales price of approximately $13,535,000. Approximately
        $6,585,400 of the sales proceeds were used to repay the outstanding note
        balance of Barton Oaks Plaza II and an additional $1,646,300 was used to
        repay a portion of the outstanding note balance of Tampa Commons. The
        gain for financial reporting purposes was approximately $5.9 million.
        Equity Office Predecessors incurred $207,600 of prepayment penalties and
        recognized $67,400 of unamortized loan costs in connection with the
        repayment. As a result, Equity Office Predecessors recorded an
        extraordinary loss in the amount of $275,000 on early extinguishment of
        debt.
 
     2) In May, 1997, Equity Office Predecessors sold 8383 Wilshire, an Office
        Property located in Beverly Hills, California for a sales price of
        approximately $59,000,000. The gain for financial reporting purposes was
        approximately $6.6 million.
 
  Financing Activities
 
     1) In January, 1997, Equity Office Predecessors obtained financing of
        approximately $34,450,000 collateralized by the North Loop and Theater
        District Parking Facilities. This loan has a 7.38% fixed interest rate
        and a 10-year term. The existing loan on the Theater District Garage of
        approximately $16,276,800 was repaid with a portion of the proceeds from
        this financing.
 
     2) In February, 1997, Equity Office Predecessors obtained an $87,000,000
        mortgage loan collateralized by BP Tower. The term of the loan is seven
        years. Interest is payable monthly with the stated interest rate fixed
        at 7.34%
 
     3) In April, 1997, Equity Office Predecessors amended and restated the $275
        million acquisition and term loan facility to a $475 million unsecured
        revolving credit facility with a maturity in October, 1997. Interest
        only is payable monthly with the interest based on various LIBOR options
        plus 1.625% or the prime rate.
 
     4) In May, 1997, Equity Office Predecessors obtained financing of
        approximately $4,500,000 collateralized by the Capitol Commons Garage.
        The term of the loan is ten years. Interest is payable monthly with the
        stated interest rate fixed at 7.83%.
 
     5) In May, 1997, Equity Office Predecessors repaid the existing loan and
        accrued interest of approximately $14,941,800 which was collateralized
        by the Denver Corporate Center Towers II and III.
 
     6) Equity Office Predecessors terminated several interest rate protection
        agreements (aggregating $173 of LIBOR based agreements) in June 1997 at
        a cost of approximately $1.1 million.
 
     7) Various interest rate protection agreements for $700 million of
        indebtedness were entered into in June, 1997. The agreements are
        composed of various tranches with various interest rates and maturities.
        The weighted average interest rate is approximately 6.71% and the
        weighted average maturity of 5.21 years.
 
  Non-Office Properties
 
     1) During the period January 1, 1997 to July 10, 1997, 13 Non-Office
        Properties were sold to an affiliate of the Equity Group Owners and two
        Non-Office Properties were sold to an unaffiliated parties which
        generated net proceeds of approximately $107,445,000.
 
                                      F-53
<PAGE>   307
 
                           EQUITY OFFICE PREDECESSORS
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     2) Immediately prior to the Consolidation, ZML Fund I's interest in Swansea
        Mall (the remaining Non-Office Property) was distributed to the capital
        partners of ZML Fund I. As a capital partner, ZML Investors, Inc.
        contributed its interest in Swansea Mall to a Qualified REIT Subsidiary
        ("QRS") in exchange for common stock in the QRS. ZML Investors, Inc.
        distributed the common stock of the QRS to its shareholders.
 
                                      F-54
<PAGE>   308
 
  SCHEDULE III -- REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31,
                                    1996(7)
<TABLE>
<CAPTION>
                                                                                                     COSTS CAPITALIZED
                                                                    INITIAL COST TO COMPANY      SUBSEQUENT TO ACQUISITION
                                                DECEMBER 31,     -----------------------------   --------------------------
                                                    1996                        BUILDINGS AND                BUILDINGS AND
       DESCRIPTION              LOCATION        ENCUMBRANCES         LAND        IMPROVEMENTS      LAND       IMPROVEMENTS
       -----------              --------       --------------    ------------   --------------   ---------   --------------
<S>                         <C>                <C>               <C>            <C>              <C>         <C>
OFFICE PROPERTIES:
60 Spear Street Building    San Francisco, CA  $    9,302,600(5) $  4,149,900   $   12,402,400   $       0   $   12,301,800
San Felipe Plaza(3)         Houston, TX            54,265,700      10,032,200      116,545,700           0       (2,296,200)
Dominion Tower              Norfolk, VA            23,440,300(5)    3,806,300       38,354,400           0        7,191,600
Summit Office Park          Ft. Worth, TX           5,860,100(5)      865,000        7,785,100           0        4,077,600
CIGNA Center                Oklahoma City, OK         732,500(5)      206,200        1,855,400           0          768,900
Tampa Commons               Tampa, FL              16,603,500(5)    2,588,600       23,305,900      32,800        2,309,000
Intercontinental Center     Houston, TX             6,226,300(5)    1,043,100        7,508,000           0        3,407,300
First Union Center          Ft. Lauderdale, FL     16,603,500(5)    4,174,100       31,352,000           0        4,898,900
Four Forest                 Dallas, TX             17,067,400(5)    3,886,900       34,981,500      26,900        4,958,500
Northborough Tower          Houston, TX             7,032,100(5)      676,500        6,060,700     363,500        4,406,500
500 Marquette Building      Albuquerque, NM        11,329,500(5)    2,490,600       22,415,300           0        1,965,400
Atrium Towers               Oklahoma City, OK       1,611,500(5)      433,200        3,898,700           0        1,889,300
One Clearlake Centre        W. Palm Beach, FL               0       2,606,200       23,455,800           0        4,304,100
Barton Oaks Plaza II        Austin, TX              6,592,600(5)      779,600        7,016,300           0          939,100
Community Corporate Center  Columbus, OH           17,412,700       2,423,200       21,808,900           0        3,565,700
Sarasota City Center        Sarasota, FL           11,720,100(5)    2,109,500       19,213,200           0        3,308,300
Denver Corporate Center
 Towers II and III          Denver, CO             15,037,100       2,304,400       20,739,200           0        3,829,100
University Tower            Durham, NC             11,207,400(5)      916,700        8,250,400           0        1,868,900
8383 Wilshire               Beverly Hills, CA               0       9,362,700       42,206,700           0        6,462,600
San Jacinto Center          Austin, TX             18,212,300       2,753,700       24,783,800           0        5,494,600
1111 19th Street, N.W.      Washington D.C.        18,752,200(5)    3,259,400       29,343,200           0       11,329,100
Shelton Pointe              Shelton, CT                     0         522,400        4,702,000           0        3,456,600
Bank One Center             Indianapolis, IN       84,250,000      11,652,700      104,874,400           0        9,622,900
North Central Plaza Three   Dallas, TX             15,035,400       1,775,100       15,976,200           0        3,158,700
The Quadrant                Englewood, CO          18,000,000       2,579,500       23,215,000           0        2,406,400
Canterbury Green            Stamford, CT           19,250,000               0       25,983,000           0        1,442,700
Three Stamford Plaza        Stamford, CT           16,750,000       1,477,900       13,301,100           0        5,534,000
Union Square                San Antonio, TX         6,750,000       1,023,000        9,206,700           0        1,656,100
One North Franklin          Chicago, IL            65,150,400       4,414,800       39,723,000           0       27,297,800
1620 L Street               Washington, DC         21,328,400       2,760,900       24,848,400           0        1,419,100
One and Two Stamford Plaza  Stamford, CT           45,791,600       5,932,800       53,395,000           0        5,958,900
300 Atlantic Street         Stamford, CT           28,309,800       3,433,500       30,901,300           0        8,146,600
Sterling Plaza              Dallas, TX             15,738,700       2,086,600       19,180,800           0        2,239,300
Higgins Centre              Des Plaines, IL         3,535,000(6)      577,800        5,200,400           0        2,455,000
Northwest Center            San Antonio, TX         6,762,000(6)    1,108,000        9,971,800           0        3,299,500
Franklin Plaza              Austin, TX             35,657,600(6)    5,805,800       52,252,400           0        2,110,300
One Crosswoods Center       Columbus, OH            3,608,200(6)      523,500        5,432,500           0        1,165,900
One Columbus                Columbus, OH           30,739,300(6)    5,024,900       45,223,900           0        2,499,900
Westshore Center            Tampa, FL               7,377,400(6)    1,192,400       10,544,900           0        2,087,500
One Lakeway                 Metairie, LA           10,144,000(6)    1,641,400       14,772,400           0        5,381,900
Two Lakeway                 Metairie, LA           15,369,600(6)    2,510,600       22,601,700           0        6,917,100
Three Lakeway               Metairie, LA           17,802,800(6)    3,773,600       34,088,800    (963,300)      (4,363,800)
NationsBank Plaza           Nashville, TN          19,008,800       2,543,800       22,894,000           0        4,049,900
Plaza at La Jolla Village   San Diego, CA          59,506,700       9,406,300       66,150,000           0        8,002,300
Interco Corporate Tower     Clayton, MO            22,661,200       3,603,700       32,433,100           0        1,390,500
9400 NCX                    Dallas, TX             14,301,700       1,416,800       12,750,300           0        6,050,400
Four Stamford Plaza         Stamford, CT           16,000,000       1,367,200       12,303,100           0        7,050,200
1920 Main Street (Koll
 Center Irvine North-West
 Tower)                     Irvine, CA             30,684,900       4,196,700       37,770,200           0        2,221,200
One Paces West              Atlanta, GA            19,500,000       3,289,500       29,605,800           0        1,043,200
Two Paces West              Atlanta, GA            28,200,000       6,859,800       42,805,600           0        1,044,700
One Market Plaza            San Francisco, CA     148,640,500      23,327,000      209,057,500           0       15,115,700
2010 Main Street (Koll
 Center Irvine North-East
 Tower)                     Irvine, CA             25,900,000       3,815,100       33,715,400           0          842,400
1100 Executive Tower        Orange, CA                      0       2,887,600       25,960,500           0        5,218,200
 
<CAPTION>
                                GROSS AMOUNT CARRIED AT
                                   DECEMBER 31, 1996
                            -------------------------------
                                             BUILDINGS AND                     ACCUMULATED       DATE         DATE     DEPRECIABLE
       DESCRIPTION               LAND         IMPROVEMENTS       TOTAL(1)      DEPRECIATION   CONSTRUCTED   ACQUIRED    LIVES(2)
       -----------          --------------   --------------   --------------   ------------   -----------   --------   -----------
<S>                         <C>              <C>              <C>              <C>            <C>           <C>        <C>
OFFICE PROPERTIES:
 
60 Spear Street Building    $    4,149,900   $   24,704,200   $   28,854,100   $ 5,553,000          1967    09/29/87        40
 
San Felipe Plaza(3)             10,032,200      114,249,500      124,281,700    37,243,000          1984    09/29/87        40
 
Dominion Tower                   3,806,300       45,546,000       49,352,300     8,142,400          1987    07/25/89        40
 
Summit Office Park                 865,000       11,862,700       12,727,700     2,682,900          1974    03/01/89        40
 
CIGNA Center                       206,200        2,624,300        2,830,500       636,700          1974    03/01/89        40
 
Tampa Commons                    2,621,400       25,614,900       28,236,300     5,598,100          1985    04/25/89        40
 
Intercontinental Center          1,043,100       10,915,300       11,958,400     2,173,000          1983    06/28/89        40
 
First Union Center               4,174,100       36,250,900       40,425,000     5,402,000          1991    06/28/89        40
 
Four Forest                      3,913,800       39,940,000       43,853,800     8,330,500          1985    06/29/89        40
 
Northborough Tower               1,040,000       10,467,200       11,507,200     1,946,500          1983    08/03/89        40
 
500 Marquette Building           2,490,600       24,380,700       26,871,300     4,909,000          1985    08/15/89        40
 
Atrium Towers                      433,200        5,788,000        6,221,200     1,324,600          1980    12/15/89        40
 
One Clearlake Centre             2,606,200       27,759,900       30,366,100     5,515,600          1987    12/29/89        40
 
Barton Oaks Plaza II               779,600        7,955,400        8,735,000     1,456,200       1984-85    05/24/90        40
 
Community Corporate Center       2,423,200       25,374,600       27,797,800     4,956,700          1987    06/14/90        40
 
Sarasota City Center             2,109,500       22,521,500       24,631,000     4,091,400          1989    09/28/90        40
 
Denver Corporate Center
 
 Towers II and III               2,304,400       24,568,300       26,872,700     5,137,400       1981-82    12/20/90        40
 
University Tower                   916,700       10,119,300       11,036,000     1,940,800          1987    10/16/91        40
 
8383 Wilshire                    9,362,700       48,669,300       58,032,000     6,731,700          1971    11/27/91        40
 
San Jacinto Center               2,753,700       30,278,400       33,032,100     4,855,400          1987    12/13/91        40
 
1111 19th Street, N.W.           3,259,400       40,672,300       43,931,700     5,954,900          1979    12/18/91        40
 
Shelton Pointe                     522,400        8,158,600        8,681,000     1,759,200          1985    11/26/91        40
 
Bank One Center                 11,652,700      114,497,300      126,150,000    14,561,100          1990     3/24/92        40
 
North Central Plaza Three        1,775,100       19,134,900       20,910,000     3,094,800          1986     4/21/92        40
 
The Quadrant                     2,579,500       25,621,400       28,200,900     3,017,200          1985     12/1/92        40
 
Canterbury Green                         0       27,425,700       27,425,700     2,801,100          1987    12/15/92        40
 
Three Stamford Plaza             1,477,900       18,835,100       20,313,000     2,421,000          1980    12/15/92        40
 
Union Square                     1,023,000       10,862,800       11,885,800     1,579,100          1986    12/23/92        40
 
One North Franklin               4,414,800       67,020,800       71,435,600     8,432,800          1991    12/31/92        40
 
1620 L Street                    2,760,900       26,267,500       29,028,400     3,087,900          1989      2/5/93        40
 
One and Two Stamford Plaza       5,932,800       59,353,900       65,286,700     6,165,300          1986     3/30/93        40
 
300 Atlantic Street              3,433,500       39,047,900       42,481,400     3,869,000          1987     3/30/93        40
 
Sterling Plaza                   2,086,600       21,420,100       23,506,700     2,359,600          1984     6/25/93        40
 
Higgins Centre                     577,800        7,655,400        8,233,200       847,400          1986    11/12/93        40
 
Northwest Center                 1,108,000       13,271,300       14,379,300     1,454,100          1984    11/12/93        40
 
Franklin Plaza                   5,805,800       54,362,700       60,168,500     4,332,400          1987    11/12/93        40
 
One Crosswoods Center              523,500        6,598,400        7,121,900       874,600          1984    11/12/93        40
 
One Columbus                     5,024,900       47,723,800       52,748,700     4,094,700          1987    11/12/93        40
 
Westshore Center                 1,192,400       12,632,400       13,824,800     1,295,700          1984    11/12/93        40
 
One Lakeway                      1,641,400       20,154,300       21,795,700     1,720,400          1981    11/12/93        40
 
Two Lakeway                      2,510,600       29,518,800       32,029,400     2,899,100          1984    11/12/93        40
 
Three Lakeway                    2,810,300       29,725,000       32,535,300     2,761,500          1987    11/12/93        40
 
NationsBank Plaza                2,543,800       26,943,900       29,487,700     2,557,400          1977     12/1/93        40
 
Plaza at La Jolla Village        9,406,300       74,152,300       83,558,600     5,996,200     1987-1990     3/10/94        40
 
Interco Corporate Tower          3,603,700       33,823,600       37,427,300     2,446,900          1986     5/27/94        40
 
9400 NCX                         1,416,800       18,800,700       20,217,500     1,345,800          1981     6/24/94        40
 
Four Stamford Plaza              1,367,200       19,353,300       20,720,500     1,188,100          1979     8/31/94        40
 
1920 Main Street (Koll
 
 Center Irvine North-West
 
 Tower)                          4,196,700       39,991,400       44,188,100     2,586,900          1988     9/29/94        40
 
One Paces West                   3,289,500       30,649,000       33,938,500     1,680,300          1987    10/31/94        40
 
Two Paces West                   6,859,800       43,850,300       50,710,100     2,500,400          1990     11/3/94        40
 
One Market Plaza                23,327,000      224,173,200      247,500,200    12,071,500          1976    11/22/94        40
 
2010 Main Street (Koll
 
 Center Irvine North-East
 
 Tower)                          3,815,100       34,557,800       38,372,900     1,797,100          1988    12/13/94        40
 
1100 Executive Tower             2,887,600       31,178,700       34,066,300     1,692,700          1987    12/15/94        40
 
</TABLE>
 
                                      F-55
<PAGE>   309
<TABLE>
<CAPTION>
                                                                                                     COSTS CAPITALIZED
                                                                    INITIAL COST TO COMPANY      SUBSEQUENT TO ACQUISITION
                                                DECEMBER 31,     -----------------------------   --------------------------
                                                    1996                        BUILDINGS AND                BUILDINGS AND
       DESCRIPTION              LOCATION        ENCUMBRANCES         LAND        IMPROVEMENTS      LAND       IMPROVEMENTS
       -----------              --------       --------------    ------------   --------------   ---------   --------------
<S>                         <C>                <C>               <C>            <C>              <C>         <C>
28 State Street(4)          Boston, MA             25,808,700       2,539,200       22,925,100           0       63,029,200
850 Third Avenue            New York, NY           54,200,000       7,044,200       63,398,000           0       10,857,300
161 North Clark (formerly
 known as Chicago Title &
 Trust Building)            Chicago, IL           106,512,000      11,801,700      107,201,800           0        7,396,400
Wachovia Center             Charlotte, NC          27,351,300       4,210,500       37,849,900           0          280,500
Central Park Office Park    Atlanta, GA            57,000,000       7,573,200       68,158,900           0        2,766,500
One American Center         Austin, TX             44,250,000               0       59,037,100           0        1,221,800
Pasadena Towers             Pasadena, CA           47,839,100       8,018,700       72,104,200           0          473,400
580 California Street       San Francisco, CA      32,067,000       5,256,400       47,268,600           0        2,479,700
1601 Market Street          Philadelphia, PA       24,379,600       3,521,200       31,656,900           0        3,771,100
Promenade II                Atlanta, GA            97,288,900      17,994,500      132,102,800           0           64,200
Two California Plaza        Los Angeles, CA        54,766,300               0       99,080,800           0        4,275,100
BP Tower                    Cleveland, OH                   0      14,663,700      131,982,100           0          131,000
Sun Trust Center            Orlando, FL                     0      11,043,900       99,394,600           0           50,000
Reston Town Center          Reston, VA             92,400,000      15,504,400      139,539,500           0           35,800
Colonnade I                 San Antonio, TX                 0       1,228,600       11,057,200           0           12,200
One Phoenix Plaza           Phoenix, AZ                     0       6,727,000       60,542,300           0                0
                                               --------------    ------------   --------------   ---------   --------------
Subtotal Office Properties                     $1,784,626,300    $300,525,900   $2,777,423,600   $(540,100)  $  329,745,400
                                               --------------    ------------   --------------   ---------   --------------
PARKING FACILITIES:
North Loop Transportation
 Center                     Chicago, IL        $            0    $  2,994,600   $   26,959,600   $       0   $      173,100
Theatre District Self Park  Chicago, IL            16,276,800       2,322,000       20,918,300           0          115,700
Capitol Commons Garage(5)   Indianapolis, IN                0               0        5,184,700           0          539,100
Boston Harbor Garage        Boston, MA             36,863,800       5,560,700       50,046,200           0                0
Milwaukee Center Parking
 Garage                     Milwaukee, WI                   0               0        4,534,800           0                0
15th & Sansom Streets       Philadelphia, PA                0         650,900        5,857,600           0                0
1616 Chancellor Street      Philadelphia, PA                0         638,000        5,741,700           0                0
Juniper/Locust Streets      Philadelphia, PA                0         516,900        4,651,700           0                0
1616 Sansom Street          Philadelphia, PA                0         382,800        3,445,800           0                0
1111 Sansom Street          Philadelphia, PA                0       1,318,600                0           0                0
                                               --------------    ------------   --------------   ---------   --------------
Subtotal Parking
 Facilities                                    $   53,140,600    $ 14,384,500   $  127,340,400   $       0   $      827,900
                                               --------------    ------------   --------------   ---------   --------------
Investment in Real Estate                      $1,837,766,900    $314,910,400   $2,904,764,000   $(540,100)  $  330,573,300
                                               ==============    ============   ==============   =========   ==============
 
<CAPTION>
                                GROSS AMOUNT CARRIED AT
                                   DECEMBER 31, 1996
                            -------------------------------
                                             BUILDINGS AND                     ACCUMULATED       DATE         DATE     DEPRECIABLE
       DESCRIPTION               LAND         IMPROVEMENTS       TOTAL(1)      DEPRECIATION   CONSTRUCTED   ACQUIRED    LIVES(2)
       -----------          --------------   --------------   --------------   ------------   -----------   --------   -----------
<S>                         <C>              <C>              <C>              <C>            <C>           <C>        <C>
 
28 State Street(4)               2,539,200       85,954,300       88,493,500             0          1968     1/23/95        40
 
850 Third Avenue                 7,044,200       74,255,300       81,299,500     3,143,300          1960     3/20/95        40
 
161 North Clark (formerly
 
 known as Chicago Title &
 
 Trust Building)                11,801,700      114,598,200      126,399,900     4,171,200          1992     7/26/95        40
 
Wachovia Center                  4,210,500       38,130,400       42,340,900     1,231,400          1972      9/1/95        40
 
Central Park Office Park         7,573,200       70,925,400       78,498,600     2,277,400          1986    10/17/95        40
 
One American Center                      0       60,258,900       60,258,900     1,693,600          1984     11/1/95        40
 
Pasadena Towers                  8,018,700       72,577,600       80,596,300     1,880,400     1990-1991    12/14/95        40
 
580 California Street            5,256,400       49,748,300       55,004,700     1,272,400          1984    12/21/95        40
 
1601 Market Street               3,521,200       35,428,000       38,949,200       947,100          1970     1/18/96        40
 
Promenade II                    17,994,500      132,167,000      150,161,500     1,790,700          1990     6/14/96        40
 
Two California Plaza                     0      103,355,900      103,355,900       984,300          1992     8/23/96        40
 
BP Tower                        14,663,700      132,113,100      146,776,800       962,400          1985      9/4/96        40
 
Sun Trust Center                11,043,900       99,444,600      110,488,500       724,900          1988     9/18/96        40
 
Reston Town Center              15,504,400      139,575,300      155,079,700       726,700          1990    10/22/96        40
 
Colonnade I                      1,228,600       11,069,400       12,298,000        11,500          1983     12/4/96        40
 
One Phoenix Plaza                6,727,000       60,542,300       67,269,300        63,000          1989     12/4/96        40
 
                            --------------   --------------   --------------   ------------
 
Subtotal Office Properties  $  299,985,800   $3,107,169,000   $3,407,154,800   $255,753,400
 
                            --------------   --------------   --------------   ------------
 
PARKING FACILITIES:
 
North Loop Transportation
 
 Center                     $    2,994,600   $   27,132,700   $   30,127,300   $ 1,038,800          1985      6/9/95        40
 
Theatre District Self Park       2,322,000       21,034,000       23,356,000       819,300          1987      6/9/95        40
 
Capitol Commons Garage(5)                0        5,723,800        5,723,800       209,300          1987     6/29/95        40
 
Boston Harbor Garage             5,560,700       50,046,200       55,606,900        52,100          1972    12/10/96        40
 
Milwaukee Center Parking
 
 Garage                                  0        4,534,800        4,534,800             0          1988    12/18/96        40
 
15th & Sansom Streets              650,900        5,857,600        6,508,500         6,100     1950/1954    12/27/96        40
 
1616 Chancellor Street             638,000        5,741,700        6,379,700         6,000     1945/1955    12/27/96        40
 
Juniper/Locust Streets             516,900        4,651,700        5,168,600         4,800     1949/1952    12/27/96        40
 
1616 Sansom Street                 382,800        3,445,800        3,828,600         3,500          1950    12/27/96        40
 
1111 Sansom Street               1,318,600                0        1,318,600             0           N/A    12/27/96       N/A
 
                            --------------   --------------   --------------   ------------
 
Subtotal Parking
 
 Facilities                 $   14,384,500   $  128,168,300   $  142,552,800   $ 2,139,900
 
                            --------------   --------------   --------------   ------------
 
Investment in Real Estate   $  314,370,300   $3,235,337,300   $3,549,707,600   $257,893,300
 
                            ==============   ==============   ==============   ============
 
</TABLE>
 
                                      F-56
<PAGE>   310
 
            SCHEDULE III -- REAL ESTATE AND ACCUMULATED DEPRECIATION
                           AS OF DECEMBER 31, 1996(7)
 
(1) The aggregate cost for Federal Income Tax purposes as of December 31, 1996
    was approximately $3.5 billion.
 
(2) The life to compute depreciation on building is 40 years. The life to
    compute depreciation on building improvements is 4-40 years.
 
(3) During 1995, concurrent with the restructuring of its mortgage on the
    property, Equity Office Predecessors reduced its carrying basis in San
    Felipe Plaza by recording a write down for value impairment of $20,248,500.
    This write down included adjustments against Investments in Real Estate of
    $17,512,000 and against Other Assets of $2,736,500.
 
(4) The building is currently vacant and is undergoing a major renovation to
    re-tenant the entire property. All operating costs, including real estate
    taxes together with interest incurred during the renovation period will be
    capitalized. As of December 31, 1996 and 1995 approximately $8,189,000 and
    $4,357,100 of operating costs and interest have been capitalized,
    respectively. In addition to the amounts paid to acquire the property,
    Equity Office Predecessors expects to incur approximately $100,000,000, of
    which approximately, $60,000,000 has been incurred. The renovation is
    expected to be completed during 1997.
 
(5) These loans are subject to cross default and collateralization provisions.
 
(6) These loans are subject to cross default and collateralization provisions.
 
(7) Summary of activity of investment in real estate and accumulated
    depreciation is as follows:
 
    The changes in the total Equity Office Predecessors investment in real
estate for the years ended December 31, 1996, 1995 and 1994 are as follows:
 
<TABLE>
<CAPTION>
                                         DECEMBER 31,     DECEMBER 31,     DECEMBER 31,
                                             1996             1995             1994
                                        --------------   --------------   --------------
<S>                                     <C>              <C>              <C>
Balance, beginning of year............  $2,571,851,300   $1,931,002,400   $1,297,304,500
  Acquisitions........................     860,995,000      583,485,200      562,752,900
  Improvements........................     129,485,300       76,985,400       72,951,600
  Properties disposed of..............      (9,633,600)               0                0
  Write down for value impairment.....               0      (17,512,000)               0
  Write-off of fully depreciated
     assets which are no longer in
     service..........................      (2,990,400)      (2,109,700)      (2,006,600)
                                        --------------   --------------   --------------
Balance, end of year..................  $3,549,707,600   $2,571,851,300   $1,931,002,400
                                        ==============   ==============   ==============
</TABLE>
 
     The changes in accumulated depreciation for the years ended December 31,
1996, 1995 and 1994 are as follows:
 
<TABLE>
<CAPTION>
                                          DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
                                              1996            1995            1994
                                          -------------   -------------   -------------
<S>                                       <C>             <C>             <C>
Balance, beginning of year..............  $(178,448,600)  $(115,842,500)  $ (77,036,900)
  Depreciation..........................    (82,905,300)    (64,715,800)    (40,812,200)
  Properties disposed of................        470,200               0               0
  Write-off of fully depreciated assets
     which are no longer in service.....      2,990,400       2,109,700       2,006,600
                                          -------------   -------------   -------------
Balance, end of year....................  $(257,893,300)  $(178,448,600)  $(115,842,500)
                                          =============   =============   =============
</TABLE>
 
                                      F-57
<PAGE>   311
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of 177 Broad Street (the Property) as described in Note 1 for the year ended
December 31, 1996. The Statement of Revenue and Certain Expenses is the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 2 and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 1 for the year ended December 31,
1996, in conformity with generally accepted accounting principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
March 28, 1997
 
                                      F-58
<PAGE>   312
 
                                177 BROAD STREET
 
                   STATEMENT OF REVENUE AND CERTAIN EXPENSES
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED
                                                              DECEMBER 31,
                                                                  1996
                                                              ------------
                                                                  (IN
                                                               THOUSANDS)
<S>                                                           <C>
REVENUE
  Base rents................................................     $4,722
  Storage and other rental income...........................         52
  Tenant reimbursements.....................................        212
  Parking income............................................        322
  Other income..............................................        103
                                                                 ------
          Total revenue.....................................      5,411
                                                                 ------
EXPENSES
  Property operating and maintenance........................        825
  Utilities and telephone...................................        769
  Repairs and maintenance...................................        313
  Real estate taxes.........................................        864
  Management fees...........................................        153
  Insurance.................................................         46
  Administrative............................................        118
                                                                 ------
          Total expenses....................................      3,088
                                                                 ------
Revenue in excess of certain expenses.......................     $2,323
                                                                 ======
</TABLE>
 
                            See accompanying notes.
 
                                      F-59
<PAGE>   313
 
                                177 BROAD STREET
 
               NOTES TO STATEMENT OF REVENUE AND CERTAIN EXPENSES
 
1. BUSINESS
 
     The accompanying Statement of Revenue and Certain Expenses relate to the
operations of 177 Broad Street located in Stamford, Connecticut (the
"Property"). The Property was acquired on January 28, 1997, by Equity Office
Predecessors, as defined elsewhere in this registration statement, from an
unrelated entity.
 
     The Property consists of a fifteen story office complex with approximately
188,000 rentable square feet, an enclosed 540 space parking structure, and a
161-unit residential apartment building.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust. The statement is not representative of the
actual operations of the Property for the period presented nor indicative of
future operations as certain expenses, primarily depreciation, amortization and
interest expense, which may not be comparable to the expenses expected to be
incurred by Equity Office Properties Trust in future operations of the Property,
have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
 Use of Estimates
 
     The preparation of the Statement of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of revenue and
expenses during the reporting period. Actual results could differ from these
estimates.
 
3. RENTALS
 
     The Property has entered into tenant leases, in the office portion of the
Property, that provide for tenants to share in the operating expenses and real
estate taxes on a pro rata basis, as defined.
 
                                      F-60
<PAGE>   314
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of Preston Commons (the Property) as described in Note 1 for the year ended
December 31, 1996. The Statement of Revenue and Certain Expenses is the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission, for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 2 and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 1 for the year ended December 31,
1996, in conformity with generally accepted accounting principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
April 16, 1997
 
                                      F-61
<PAGE>   315
 
                                PRESTON COMMONS
 
                   STATEMENT OF REVENUE AND CERTAIN EXPENSES
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED
                                                               DECEMBER 31,
                                                                   1996
                                                              --------------
                                                              (IN THOUSANDS)
<S>                                                           <C>
REVENUE
  Base rents................................................      $6,347
  Tenant reimbursements.....................................       1,132
  Garage and parking income.................................         216
  Other income..............................................          91
                                                                  ------
          Total revenue.....................................       7,786
                                                                  ------
EXPENSES
  Property operating & maintenance..........................       2,327
  Real estate taxes.........................................         742
  Management fees...........................................         226
  Insurance.................................................          30
                                                                  ------
          Total expenses....................................       3,325
                                                                  ------
Revenue in excess of certain expenses.......................      $4,461
                                                                  ======
</TABLE>
 
                            See accompanying notes.
 
                                      F-62
<PAGE>   316
 
                                PRESTON COMMONS
 
               NOTES TO STATEMENT OF REVENUE AND CERTAIN EXPENSES
 
1. BUSINESS
 
     The accompanying Statement of Revenue and Certain Expenses relates to the
operations of the Preston Commons building, an office building with
approximately 419,000 rentable square feet, located in Dallas, Texas (the
"Property"). The Property was acquired on March 21, 1997, by Equity Office
Predecessors, as defined elsewhere in this registration statement, from an
unrelated entity.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust. The statement is not representative of the
actual operations of the Property for the period presented nor indicative of
future operations as certain expenses, primarily depreciation, amortization and
interest expense, which may not be comparable to the expenses expected to be
incurred by Equity Office Properties Trust in future operations of the Property,
have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the Statement of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of revenue and
expenses during the reporting period. Actual results could differ from these
estimates.
 
3. RENTALS
 
     The Property has entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
                                      F-63
<PAGE>   317
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of Oakbrook Terrace Tower (the Property) as described in Note 1 for the year
ended December 31, 1996. The Statement of Revenue and Certain Expenses is the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission, for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 2 and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 1 for the year ended December 31,
1996, in conformity with generally accepted accounting principles.
 
                                                     ERNST & YOUNG LLP
 
Chicago, Illinois
May 30, 1997
 
                                      F-64
<PAGE>   318
 
                             OAKBROOK TERRACE TOWER
 
                   STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED      THREE MONTHS
                                                              DECEMBER 31,    ENDED MARCH 31,
                                                                  1996             1997
                                                              ------------    ---------------
                                                                                (UNAUDITED)
                                                                      (IN THOUSANDS)
<S>                                                           <C>             <C>
REVENUE
  Base rents................................................    $11,409           $3,113
  Tenant reimbursements.....................................      5,282            1,366
  Garage and parking income.................................        148               37
  Other income..............................................        193               97
                                                                -------           ------
          Total revenue.....................................     17,032            4,613
                                                                -------           ------
EXPENSES
  Property operating & maintenance..........................      4,276            1,037
  Real estate taxes.........................................      1,259              353
  Management fees...........................................        338              116
  Insurance.................................................        111               17
                                                                -------           ------
          Total expenses....................................      5,984            1,523
                                                                -------           ------
Revenue in excess of certain expenses.......................    $11,048           $3,090
                                                                =======           ======
</TABLE>
 
                            See accompanying notes.
 
                                      F-65
<PAGE>   319
 
                             OAKBROOK TERRACE TOWER
 
              NOTES TO STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. BUSINESS
 
     The accompanying Statements of Revenue and Certain Expenses relate to the
operations of the Oakbrook Terrace Tower building, an office building with
approximately 773,000 rentable square feet, located in Oakbrook Terrace,
Illinois (the "Property"). The Property was acquired on April 15, 1997, by
Equity Office Predecessors, as defined elsewhere in this registration statement,
from an unrelated entity.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statements of Revenue and Certain Expenses were prepared
for the purpose of complying with the rules and regulations of the Securities
and Exchange Commission for inclusion in the registration statement on Form S-4
of Equity Office Properties Trust. The statements are not representative of the
actual operations of the Property for the periods presented nor indicative of
future operations as certain expenses, primarily depreciation, amortization and
interest expense, which may not be comparable to the expenses expected to be
incurred by Equity Office Properties Trust in future operations of the Property,
have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the Statements of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of revenue and
expenses during the reporting period. Actual results could differ from these
estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement of revenue
and certain expenses for the three months ended March 31, 1997, reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
3. RENTALS
 
     Property has entered into tenant leases that provide for tenants to share
in the operating expenses and real estate taxes on a pro rata basis, as defined.
 
4. RELATED PARTY TRANSACTIONS
 
     During the year ended December 31, 1996, the Property was managed by an
affiliated party to the seller. The management agreement provided for a fee of
2.5% of gross receipts, as defined.
 
                                      F-66
<PAGE>   320
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of One Maritime Plaza (the Property) as described in Note 1 for the year ended
December 31, 1996. The Statement of Revenue and Certain Expenses is the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission, for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 2 and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 1 for the year ended December 31,
1996, in conformity with generally accepted accounting principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
June 6, 1997
 
                                      F-67
<PAGE>   321
 
                               ONE MARITIME PLAZA
 
                   STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
<TABLE>
<CAPTION>
                                                                                    THREE MONTHS
                                                                 YEAR ENDED            ENDED
                                                              DECEMBER 31, 1996    MARCH 31, 1997
                                                              -----------------    --------------
                                                                                    (UNAUDITED)
                                                                        (IN THOUSANDS)
<S>                                                           <C>                  <C>
REVENUE
  Base rents................................................       $13,410            $ 3,382
  Tenant reimbursements.....................................           208                125
  Interest income...........................................           249                 65
  Other income..............................................           428                125
                                                                   -------            -------
          Total revenue.....................................        14,295              3,697
                                                                   -------            -------
EXPENSES
Property operating & maintenance............................         4,326                887
  Real estate taxes.........................................           668                250
  Management fees...........................................           585                146
  Insurance.................................................           447                119
                                                                   -------            -------
          Total expenses....................................         6,026              1,402
                                                                   -------            -------
Revenue in excess of certain expenses.......................       $ 8,269            $ 2,295
                                                                   =======            =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-68
<PAGE>   322
 
                               ONE MARITIME PLAZA
 
              NOTES TO STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. BUSINESS
 
     The accompanying Statements of Revenue and Certain Expenses relate to the
operations of the One Maritime Plaza building, an office building with
approximately 524,000 rentable square feet, located in San Francisco, California
(the "Property"). The Property was acquired on April 24, 1997, by Equity Office
Predecessors, as defined elsewhere in this registration statement, from an
unrelated entity.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statements of Revenue and Certain Expenses were prepared
for the purpose of complying with the rules and regulations of the Securities
and Exchange Commission for inclusion in the registration statement on Form S-4
of Equity Office Properties Trust. The statements are not representative of the
actual operations of the Property for the periods presented nor indicative of
future operations as certain expenses, primarily depreciation, amortization and
interest expense, which may not be comparable to the expenses expected to be
incurred by Equity Office Properties Trust in future operations of the Property,
have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the Statements of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of revenue and
expenses during the reporting period. Actual results could differ from these
estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement of revenue
and certain expenses for the three months ended March 31, 1997, reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
3. RENTALS
 
     The Property has entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
                                      F-69
<PAGE>   323
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of 201 Mission Street (the Property) as described in Note 1 for the year ended
December 31, 1996. The Statement of Revenue and Certain Expenses is the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission, for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 2 and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 1 for the year ended December 31,
1996, in conformity with generally accepted accounting principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
April 30, 1997
 
                                      F-70
<PAGE>   324
 
                               201 MISSION STREET
 
                   STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED        THREE MONTHS
                                                                DECEMBER 31,      ENDED MARCH 31,
                                                                    1996               1997
                                                              -----------------   ---------------
                                                                                    (UNAUDITED)
                                                                        (IN THOUSANDS)
<S>                                                           <C>                 <C>
REVENUE
  Base rents................................................       $7,423             $2,166
  Tenant reimbursements.....................................           55                  9
  Garage and parking income.................................          366                 60
  Other income..............................................           39                 11
                                                                  -------             ------
          Total revenue.....................................        7,883              2,246
                                                                  -------             ------
EXPENSES
  Property operating & maintenance..........................        3,369                969
  Real estate taxes.........................................          959                264
  Management fees...........................................          106                 27
  Insurance.................................................          569                196
                                                                  -------             ------
          Total expenses....................................        5,003              1,456
                                                                  -------             ------
Revenue in excess of certain expenses.......................       $2,880             $  790
                                                                  =======             ======
</TABLE>
 
                            See accompanying notes.
 
                                      F-71
<PAGE>   325
 
                               201 MISSION STREET
 
              NOTES TO STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. BUSINESS
 
     The accompanying Statements of Revenue and Certain Expenses relate to the
operations of the 201 Mission Street building, an office building with
approximately 483,000 rentable square feet, located in San Francisco, California
(the "Property"). The Property was acquired on April 30, 1997, by Equity Office
Predecessors, as defined elsewhere in this registration statement, from an
unrelated entity.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statements of Revenue and Certain Expenses were prepared
for the purpose of complying with the rules and regulations of the Securities
and Exchange Commission for inclusion in the registration statement on Form S-4
of Equity Office Properties Trust. The statements are not representative of the
actual operations of the Property for the periods presented nor indicative of
future operations as certain expenses, primarily depreciation, amortization and
interest expense, which may not be comparable to the expenses expected to be
incurred by Equity Office Properties Trust in future operations of the Property,
have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the Statement of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of revenue and
expenses during the reporting period. Actual results could differ from these
estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement of revenue
and certain expenses for the three months ended March 31, 1997, reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
3. RENTALS
 
     The Property has entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
                                      F-72
<PAGE>   326
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of 30 N. LaSalle (the Property) as described in Note 1 for the year ended
December 31, 1996. The Statement of Revenue and Certain Expenses is the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission, for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 2 and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 1 for the year ended December 31,
1996, in conformity with generally accepted accounting principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
June 13, 1997
 
                                      F-73
<PAGE>   327
 
                                 30 N. LASALLE
 
                   STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
<TABLE>
<CAPTION>
                                                                              THREE MONTHS
                                                               YEAR ENDED        ENDED
                                                              DECEMBER 31,     MARCH 31,
                                                                  1996            1997
                                                              ------------    ------------
                                                                     (IN THOUSANDS)
<S>                                                           <C>             <C>
REVENUE
  Base rents................................................    $ 9,317          $1,870
  Tenant reimbursements.....................................      9,164           2,194
  Other income..............................................        237              55
                                                                -------          ------
          Total revenue.....................................     18,718           4,119
                                                                -------          ------
EXPENSES
  Property operating & maintenance..........................      4,336           1,047
  Real estate taxes.........................................      5,155           1,327
  Management fees...........................................        374              79
  Insurance.................................................        160              39
  Ground rent...............................................        165              42
                                                                -------          ------
          Total expenses....................................     10,190           2,534
                                                                -------          ------
Revenue in excess of certain expenses.......................    $ 8,528          $1,585
                                                                =======          ======
</TABLE>
 
                            See accompanying notes.
 
                                      F-74
<PAGE>   328
 
                                 30 N. LASALLE
 
              NOTES TO STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. BUSINESS
 
     The accompanying Statements of Revenue and Certain Expenses relate to the
operations of the 30 N. LaSalle building, an office building with approximately
926,000 rentable square feet, located in Chicago, Illinois (the "Property"). The
Property was acquired on June 13, 1997, by Equity Office Predecessors, as
defined elsewhere in this registration statement, from an unrelated entity.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statements of Revenue and Certain Expenses were prepared
for the purpose of complying with the rules and regulations of the Securities
and Exchange Commission for inclusion in the registration statement on Form S-4
of Equity Office Properties Trust. The statements are not representative of the
actual operations of the Property for the periods presented nor indicative of
future operations as certain expenses, primarily depreciation, amortization and
interest expense, which may not be comparable to the expenses expected to be
incurred by Equity Office Properties Trust in future operations of the Property,
have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the Statements of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of revenue and
expenses during the reporting period. Actual results could differ from these
estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement of revenue
and certain expenses for the three months ended March 31, 1997, reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
3. RENTALS
 
     The Property has entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
4. RELATED PARTY TRANSACTIONS
 
     During the year ended December 31, 1996, the Property was managed by an
affiliated party to the seller. The management agreement provided for a fee of
2% of gross receipts, as defined.
 
5. GROUND LEASE
 
     The Property is subject to a ground lease on a portion of the land under
the building which expires November 30, 2067. The ground lease provides for
escalation payments in intervals of approximately 10 years, with the next
escalation scheduled for January 1, 2000. Through 1999, the minimum annual
rental payments required under the ground lease are $165,000.
 
                                      F-75
<PAGE>   329
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying combined Statement of Revenue and Certain
Expenses of the Columbus America Properties (the Properties) as described in
Note 2 for the year ended December 31, 1996. The combined Statement of Revenue
and Certain Expenses is the responsibility of the Properties' management. Our
responsibility is to express an opinion on the combined Statement of Revenue and
Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying combined Statement of Revenue and Certain Expenses was
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission, for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust as described in Note 1, and is not
intended to be a complete presentation of the Properties' revenue and expenses.
 
     In our opinion, the combined Statement of Revenue and Certain Expenses
referred to above presents fairly, in all material respects, the combined
revenue and certain expenses of the Properties described in Note 2 for the year
ended December 31, 1996, in conformity with generally accepted accounting
principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
September 3, 1997
 
                                      F-76
<PAGE>   330
 
                          COLUMBUS AMERICA PROPERTIES
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                             (AMOUNTS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED     JANUARY 1, 1997
                                                              DECEMBER 31,        THROUGH
                                                                  1996         JULY 31, 1997
                                                              ------------    ---------------
                                                                                (UNAUDITED)
<S>                                                           <C>             <C>
REVENUE
  Base rents................................................    $15,620           $ 8,814
  Tenant reimbursements.....................................        654               176
  Parking income............................................      2,356             1,460
  Other income..............................................        165               111
                                                                -------           -------
          Total revenue.....................................     18,795            10,561
                                                                -------           -------
EXPENSES
  Property operating and maintenance........................      4,888             2,770
  Real estate taxes.........................................      1,318               769
  Management fee............................................        786               403
  Insurance.................................................        191               127
                                                                -------           -------
          Total expenses....................................      7,183             4,069
                                                                -------           -------
Revenue in excess of certain expenses.......................    $11,612           $ 6,492
                                                                =======           =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-77
<PAGE>   331
 
                          COLUMBUS AMERICA PROPERTIES
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying combined Statements of Revenue and Certain Expenses were
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust. The accompanying financial
statements are not representative of the actual operations of the Properties, as
defined in Note 2, for the periods presented nor indicative of future operations
as certain expenses, primarily depreciation, amortization and interest expense,
which may not be comparable to the expenses expected to be incurred by Equity
Office Properties Trust in future operations of the Properties, have been
excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the combined Statements of Revenue and Certain Expenses
in conformity with generally accepted accounting principles requires management
to make estimates and assumptions that affect the reported amounts of the
combined revenue and expenses during the reporting periods. Actual results could
differ from these estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
2. DESCRIPTION OF PROPERTIES
 
     The accompanying combined Statements of Revenue and Certain Expenses relate
to the combined operations of the Columbus America Properties (the
"Properties"), which are all located in New Orleans, Louisiana. The Properties
have been presented on a combined basis because the Properties are under common
ownership and management. The Properties listed below were acquired on September
3, 1997 for $140 million by Equity Office Properties Trust from an unrelated
party.
 
<TABLE>
<CAPTION>
                  PROPERTY NAME                     TYPE OF FACILITY    RENTABLE SQUARE FEET
                  -------------                     ----------------    --------------------
<S>                                                 <C>                 <C>
LL & E Tower......................................  office building           545,157
Texaco Center.....................................  office building           619,714
601 Tchoupitoulas.................................  parking facility              759(A)
</TABLE>
 
- ---------------
 
(A) Represents number of parking spaces.
 
     The accompanying combined Statements of Revenue and Certain Expenses
include the operations of the 601 Tchoupitoulas parking facility.
 
3. RENTALS
 
     LL&E Tower and Texaco Center have entered into tenant leases that provide
for tenants to share in the operating expenses and real estate taxes on a pro
rata basis, as defined.
 
                                      F-78
<PAGE>   332
 
                          COLUMBUS AMERICA PROPERTIES
 
                    NOTES TO COMBINED STATEMENTS OF REVENUE
                      AND CERTAIN EXPENSES -- (CONTINUED)
 
4. RELATED PARTY TRANSACTIONS
 
     The office buildings were managed by an affiliated party to the seller. The
management agreements provided for a fee based on a percentage of gross
receipts, as defined by each of the office buildings' individual management
agreements, excluding any receipts from the parking garage.
 
     During the year ended December 31, 1996, the parking facility was also
managed by an affiliated party to the seller. The management agreement provided
for a flat fee of $12,500 per month.
 
     During the year ended December 31, 1996, LL&E Tower leased space to parties
affiliated with the seller. Rental income from those leases was approximately
$240,000 in 1996.
 
                                      F-79
<PAGE>   333
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying combined Statement of Revenue and Certain
Expenses of the Prudential Properties (the Properties) as described in Note 2
for the year ended December 31, 1996. The combined Statement of Revenue and
Certain Expenses is the responsibility of the Properties' management. Our
responsibility is to express an opinion on the combined Statement of Revenue and
Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying combined Statement of Revenue and Certain Expenses was
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust as described in Note 1, and is not
intended to be a complete presentation of the Properties' combined revenue and
expenses.
 
     In our opinion, the combined Statement of Revenue and Certain Expenses
referred to above presents fairly, in all material respects, the combined
revenue and certain expenses of the Properties described in Note 2 for the year
ended December 31, 1996, in conformity with generally accepted accounting
principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
September 3, 1997
 
                                      F-80
<PAGE>   334
 
                             PRUDENTIAL PROPERTIES
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                             (AMOUNTS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                              JANUARY 1, 1997
                                                               YEAR ENDED         THROUGH
                                                              DECEMBER 31,      AUGUST 31,
                                                                  1996             1997
                                                              ------------    ---------------
                                                                                (UNAUDITED)
<S>                                                           <C>             <C>
REVENUE
  Base rents................................................    $29,743           $21,626
  Tenant reimbursements.....................................      2,367             1,645
  Parking income............................................      2,013             1,561
  Other income..............................................        529               778
                                                                -------           -------
          Total revenue.....................................     34,652            25,610
                                                                -------           -------
EXPENSES
  Property operating and maintenance........................     13,239             8,687
  Real estate taxes.........................................      4,414             3,112
  Management fees...........................................        719               514
  Insurance.................................................        446               361
                                                                -------           -------
  Total expenses............................................     18,818            12,674
                                                                -------           -------
Revenue in excess of certain expenses.......................    $15,834           $12,936
                                                                =======           =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-81
<PAGE>   335
 
                             PRUDENTIAL PROPERTIES
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying combined Statements of Revenue and Certain Expenses were
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust. The accompanying financial
statements are not representative of the actual operations of the Properties, as
defined in Note 2, for the periods presented nor indicative of future operations
as certain expenses, primarily depreciation, amortization and interest expense,
which may not be comparable to the expenses expected to be incurred by Equity
Office Properties Trust in future operations of the Properties, have been
excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the combined Statements of Revenue and Certain Expenses
in conformity with generally accepted accounting principles requires management
to make estimates and assumptions that affect the reported amounts of the
combined revenue and expenses during the reporting periods. Actual results could
differ from these estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
2. DESCRIPTION OF PROPERTIES
 
     The accompanying combined Statements of Revenue and Certain Expenses relate
to the combined operations of the Prudential Properties (the "Properties").
Equity Office Properties Trust expects to acquire the Properties for
approximately $290 million from an unrelated party. The Properties have been
presented on a combined basis because all of the Properties are under common
control and management. The following Properties are included in the combined
financial statements:
 
<TABLE>
<CAPTION>
                                                                            APPROXIMATE
                                                                              RENTABLE
                    PROPERTY NAME                           LOCATION       SQUARE FOOTAGE
                    -------------                           --------       --------------
<S>                                                     <C>                <C>
Brookhollow Central I, II and III.....................  Houston, TX            800,688
Destec Tower..........................................  Houston, TX            574,216
8080 Central..........................................  Dallas, TX             283,707
1700 Market...........................................  Philadelphia, PA       825,547
                                                                             ---------
                                                                             2,484,158
                                                                             =========
</TABLE>
 
3. RENTALS
 
     The Properties have entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
4. RELATED PARTY TRANSACTIONS
 
     The Properties were managed by an affiliated party to the seller. The
management agreements provided for fees of 1.5% to 3.0% of gross receipts, as
defined.
 
     Insurance premiums are paid to and coverage is provided by an affiliated
party to the seller.
 
                                      F-82
<PAGE>   336
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of 550 South Hope Street (the Property) as described in Note 2 for the year
ended March 31, 1997. The Statement of Revenue and Certain Expenses are the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission, for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 1, and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 2 for the year ended March 31, 1997,
in conformity with generally accepted accounting principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
September 24, 1997
 
                                      F-83
<PAGE>   337
 
                             550 SOUTH HOPE STREET
 
                   STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                             (AMOUNTS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED    APRIL 1, 1997
                                                              MARCH 31,    THROUGH JULY 31,
                                                                 1997            1997
                                                              ----------   ----------------
                                                                             (UNAUDITED)
<S>                                                           <C>          <C>
REVENUE
  Base rents................................................    $7,602          $2,972
  Tenant reimbursements.....................................     3,840           1,398
  Parking income............................................     1,273             423
  Other income..............................................        19               7
                                                                ------         -------
          Total revenue.....................................    12,734           4,800
                                                                ======         =======
EXPENSES
  Property operating and maintenance........................     3,992           1,302
  Real estate taxes.........................................       801             251
  Management fee............................................       140              58
  Insurance.................................................       605             152
                                                                ------         -------
          Total expenses....................................     5,538           1,763
                                                                ------         -------
Revenue in excess of certain expenses.......................    $7,196          $3,037
                                                                ======         =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-84
<PAGE>   338
 
                             550 SOUTH HOPE STREET
 
              NOTES TO STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statements of Revenue and Certain Expenses were prepared
for the purpose of complying with the rules and regulations of the Securities
and Exchange Commission for inclusion in the registration statement on Form S-4
of Equity Office Properties Trust. The accompanying statements are not
representative of the actual operations of the Property, as defined in Note 2,
for the periods presented nor indicative of future operations as certain
expenses, primarily depreciation, amortization and interest expense, which may
not be comparable to the expenses expected to be incurred by Equity Office
Properties Trust in future operations of the Property, have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the Statements of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of the revenue
and expenses during the reporting periods. Actual results could differ from
these estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
2. DESCRIPTION OF PROPERTY
 
     The accompanying Statements of Revenue and Certain Expenses relate to the
operations of 550 South Hope Street, an office building with approximately
566,434 rentable square feet, located in Los Angeles, California (the
"Property"). It is anticipated that Equity Office Properties Trust will acquire
the Property for $99.5 million from an unrelated party.
 
3. RENTALS
 
     The Property has entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
                                      F-85
<PAGE>   339
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying combined Statement of Revenue and Certain
Expenses of the Acorn Properties (the Properties) as described in Note 2 for the
year ended December 31, 1996. The combined Statement of Revenue and Certain
Expenses is the responsibility of the Properties' management. Our responsibility
is to express an opinion on the combined Statement of Revenue and Certain
Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying combined Statement of Revenue and Certain Expenses was
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust as described in Note 1, and is not
intended to be a complete presentation of the Properties' combined revenue and
expenses.
 
     In our opinion, the combined Statement of Revenue and Certain Expenses
referred to above presents fairly, in all material respects, the combined
revenue and certain expenses of the Properties described in Note 2 for the year
ended December 31, 1996, in conformity with generally accepted accounting
principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
September 9, 1997
 
                                      F-86
<PAGE>   340
 
                                ACORN PROPERTIES
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                             (AMOUNTS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED        JANUARY 1, 1997
                                                                DECEMBER 31,       THROUGH JULY 31,
                                                                    1996                 1997
                                                              -----------------    ----------------
                                                                                     (UNAUDITED)
<S>                                                           <C>                  <C>
REVENUE
  Base rents................................................       $16,999              $11,592
  Tenant reimbursements.....................................         2,055                1,327
  Other income..............................................           202                  181
                                                                   -------              -------
          Total revenue.....................................        19,256               13,100
                                                                   -------              -------
EXPENSES
  Property operating and maintenance........................         4,526                2,665
  Real estate taxes.........................................         1,378                  853
  Management fees...........................................           649                  428
  Insurance.................................................           160                   92
                                                                   -------              -------
          Total expenses....................................         6,713                4,038
                                                                   -------              -------
Revenue in excess of certain expenses.......................       $12,543              $ 9,062
                                                                   =======              =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-87
<PAGE>   341
 
                                ACORN PROPERTIES
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying combined Statements of Revenue and Certain Expenses were
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust. The accompanying financial
statements are not representative of the actual operations of the Properties, as
defined in Note 2, for the periods presented nor indicative of future operations
as certain expenses, primarily depreciation, amortization and interest expense,
which may not be comparable to the expenses expected to be incurred by Equity
Office Properties Trust in future operations of the Properties, have been
excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the combined Statements of Revenue and Certain Expenses
in conformity with generally accepted accounting principles requires management
to make estimates and assumptions that affect the reported amounts of the
combined revenue and expenses during the reporting periods. Actual results could
differ from these estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
2. DESCRIPTION OF PROPERTIES
 
     The accompanying combined Statements of Revenue and Certain Expenses relate
to the combined operations of the Acorn Properties (the "Properties"). Equity
Office Properties Trust expects to acquire an 89% managing general partnership
interest in each of the partnerships that hold title to the Properties for
approximately $144.7 million, including the assumption of debt. The Acorn
Properties have been presented on a combined basis because all of the Properties
are under common control and management. The following Properties are included
in the combined financial statements:
 
<TABLE>
<CAPTION>
                                                                           APPROXIMATE
                                                                             RENTABLE
          PROPERTY NAME                          LOCATION                 SQUARE FOOTAGE
          -------------                          --------                 --------------
<S>                                  <C>                                  <C>
One Valley Square................    Plymouth Meeting, PA                      70,289
Two Valley Square................    Plymouth Meeting, PA                      70,622
Three Valley Square..............    Plymouth Meeting, PA                      84,605
Four Valley Square...............    Plymouth Meeting, PA                      49,757
Five Valley Square...............    Plymouth Meeting, PA                      18,564
Oak Hill Plaza...................    King of Prussia, PA                      164,360
Walnut Hill Plaza................    King of Prussia, PA                      149,716
One Devon Square.................    Wayne, PA                                 77,267
Two Devon Square.................    Wayne, PA                                 63,226
Three Devon Square (a)...........    Wayne, PA                                  6,000
Four Falls Corporate Center......    Conshohocken, PA                         254,355
                                                                            ---------
                                                                            1,008,761
                                                                            =========
</TABLE>
 
- ---------------
 
(a) In addition, this property includes land leased to a third party.
 
                                      F-88
<PAGE>   342
 
                                ACORN PROPERTIES
 
                    NOTES TO COMBINED STATEMENTS OF REVENUE
                      AND CERTAIN EXPENSES -- (CONTINUED)
 
3. RENTALS
 
     The Properties have entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
4. RELATED PARTY TRANSACTIONS
 
     The Properties were managed by an affiliated party to the sellers. The
management agreements provided for a fee of 4% of gross receipts, as defined.
 
     Janitorial services were provided by an affiliated party to the sellers.
During the year ended December 31, 1996, the Properties incurred approximately
$714,000 in janitorial fees.
 
                                      F-89
<PAGE>   343
 
                         REPORT OF INDEPENDENT AUDITORS
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying combined Statement of Revenue and Certain
Expenses of 10 & 30 South Wacker Drive (the Properties) as described in Note 2
for the year ended December 31, 1996. The combined Statement of Revenue and
Certain Expenses is the responsibility of the Properties' management. Our
responsibility is to express an opinion on the combined Statement of Revenue and
Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying combined Statement of Revenue and Certain Expenses was
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission, for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust as described in Note 1, and is not
intended to be a complete presentation of the Properties' revenue and expenses.
 
     In our opinion, the combined Statement of Revenue and Certain Expenses
referred to above presents fairly, in all material respects, the combined
revenue and certain expenses of the Properties described in Note 2 for the year
ended December 31, 1996, in conformity with generally accepted accounting
principles.
 
                                                     ERNST & YOUNG LLP
Chicago, Illinois
September 5, 1997
 
                                      F-90
<PAGE>   344
 
                           10 & 30 SOUTH WACKER DRIVE
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                             (AMOUNTS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED       JANUARY 1, 1997
                                                                DECEMBER 31,      THROUGH JULY 31,
                                                                    1996                1997
                                                              -----------------   ----------------
                                                                                    (UNAUDITED)
<S>                                                           <C>                 <C>
REVENUE
  Base rents................................................       $38,739            $23,388
  Tenant reimbursements.....................................        23,518             14,604
  Parking income............................................         1,188                786
  Other income..............................................         2,232                643
                                                                   -------            -------
          Total revenue.....................................        65,677             39,421
                                                                   -------            -------
EXPENSES
  Property operating and maintenance........................         9,891              5,370
  Real estate taxes.........................................        16,600              9,683
  Management fee............................................         1,233                754
  Insurance.................................................           403                160
                                                                   -------            -------
          Total expenses....................................        28,127             15,967
                                                                   -------            -------
Revenue in excess of certain expenses.......................       $37,550            $23,454
                                                                   =======            =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-91
<PAGE>   345
 
                           10 & 30 SOUTH WACKER DRIVE
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying combined Statements of Revenue and Certain Expenses were
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust. The accompanying combined
statements are not representative of the actual operations of the Properties, as
defined in Note 2, for the periods presented nor indicative of future operations
as certain expenses, primarily depreciation, amortization and interest expense,
which may not be comparable to the expenses expected to be incurred by Equity
Office Properties Trust in future operations of the Properties, have been
excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the combined Statements of Revenue and Certain Expenses
in conformity with generally accepted accounting principles requires management
to make estimates and assumptions that affect the reported amounts of the
combined revenue and expenses during the reporting periods. Actual results could
differ from these estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
2. DESCRIPTION OF PROPERTIES
 
     The accompanying combined Statements of Revenue and Certain Expenses relate
to the combined operations of 10 & 30 South Wacker Drive, two office buildings
with approximately 2,016,023 million rentable square feet, located in Chicago,
Illinois (the "Properties"). The Properties have been presented on a combined
basis because the Properties were under common ownership and management. It is
anticipated that the Properties will be acquired for $462 million by Equity
Office Properties Trust from an unrelated party.
 
                                      F-92
<PAGE>   346
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying Statement of Revenue and Certain Expenses
of One Lafayette Centre (the Property) as described in Note 2 for the year ended
December 31, 1996. The Statement of Revenue and Certain Expenses is the
responsibility of the Property's management. Our responsibility is to express an
opinion on the Statement of Revenue and Certain Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying Statement of Revenue and Certain Expenses was prepared for
the purpose of complying with the rules and regulations of the Securities and
Exchange Commission, for inclusion in the registration statement on Form S-4 of
Equity Office Properties Trust as described in Note 1, and is not intended to be
a complete presentation of the Property's revenue and expenses.
 
     In our opinion, the Statement of Revenue and Certain Expenses referred to
above presents fairly, in all material respects, the revenue and certain
expenses of the Property described in Note 2 for the year ended December 31,
1996, in conformity with generally accepted accounting principles.
 
                                                     ERNST & YOUNG LLP
 
Chicago, Illinois
September 5, 1997
 
                                      F-93
<PAGE>   347
 
                              ONE LAFAYETTE CENTRE
 
                   STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                             (AMOUNTS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED        JANUARY 1, 1997
                                                                DECEMBER 31,       THROUGH JULY 31,
                                                                    1996                 1997
                                                              -----------------    ----------------
                                                                                     (UNAUDITED)
<S>                                                           <C>                  <C>
REVENUE
  Base rents................................................       $8,509               $5,409
  Tenant reimbursements.....................................          855                  582
  Parking income............................................          446                  260
  Other income..............................................          158                   46
                                                                  -------              -------
          Total revenue.....................................        9,968                6,297
                                                                  -------              -------
EXPENSES
  Property operating and maintenance........................        2,238                1,360
  Real estate taxes.........................................        1,154                  625
  Management fee............................................          300                  186
  Insurance.................................................           57                   34
                                                                  -------              -------
          Total expenses....................................        3,749                2,205
                                                                  -------              -------
Revenue in excess of certain expenses.......................       $6,219               $4,092
                                                                  =======              =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-94
<PAGE>   348
 
                              ONE LAFAYETTE CENTRE
 
              NOTES TO STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying Statements of Revenue and Certain Expenses were prepared
for the purpose of complying with the rules and regulations of the Securities
and Exchange Commission for inclusion in the registration statement on Form S-4
of Equity Office Properties Trust. The accompanying statements are not
representative of the actual operations of the Property for the periods
presented nor indicative of future operations as certain expenses, primarily
depreciation, amortization and interest expense, which may not be comparable to
the expenses expected to be incurred by Equity Office Properties Trust in future
operations of the Property, have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the Statements of Revenue and Certain Expenses in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of the revenue
and expenses during the reporting periods. Actual results could differ from
these estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
2. DESCRIPTION OF PROPERTY
 
     The accompanying Statements of Revenue and Certain Expenses relate to the
operations of One Lafayette Centre, an office building with approximately
410,000 rentable square feet, located in Washington, D.C. (the "Property"). It
is expected that the Property will be acquired for $77.5 million by Equity
Office Properties Trust from an unrelated party.
 
3. RENTALS
 
     The Property has entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
                                      F-95
<PAGE>   349
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Trustees of
Equity Office Properties Trust
 
     We have audited the accompanying combined Statement of Revenue and Certain
Expenses of the PPM Properties (the Properties) as described in Note 2 for the
year ended December 31, 1996. The combined Statement of Revenue and Certain
Expenses is the responsibility of the Properties' management. Our responsibility
is to express an opinion on the combined Statement of Revenue and Certain
Expenses based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the Statement of Revenue and Certain Expenses
is free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures made in the Statement of Revenue
and Certain Expenses. An audit also includes assessing the basis of accounting
used and significant estimates made by management, as well as evaluating the
overall presentation of the Statement of Revenue and Certain Expenses. We
believe that our audit provides a reasonable basis for our opinion.
 
     The accompanying combined Statement of Revenue and Certain Expenses was
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust as described in Note 1, and is not
intended to be a complete presentation of the Properties' combined revenue and
expenses.
 
     In our opinion, the combined Statement of Revenue and Certain Expenses
referred to above presents fairly, in all material respects, the combined
revenue and certain expenses of the Properties described in Note 2 for the year
ended December 31, 1996, in conformity with generally accepted accounting
principles.
 
                                            ERNST & YOUNG LLP
 
Chicago, Illinois
January 22, 1997
 
                                      F-96
<PAGE>   350
 
                                 PPM PROPERTIES
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                             (AMOUNTS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                             JANUARY 1, 1997
                                                               YEAR ENDED        THROUGH
                                                              DECEMBER 31,     AUGUST 31,
                                                                  1996            1997
                                                              ------------   ---------------
                                                                               (UNAUDITED)
<S>                                                           <C>            <C>
REVENUE
  Base rents................................................    $ 9,784          $7,038
  Tenant reimbursements.....................................        344             262
  Parking income............................................        152             119
  Other income..............................................        144              56
                                                                -------          ------
          Total revenue.....................................     10,424           7,475
                                                                -------          ------
EXPENSES
  Property operating and maintenance........................      3,062           2,122
  Real estate taxes.........................................      1,170             824
  Management fees...........................................        228             168
  Insurance.................................................         92              76
                                                                -------          ------
          Total expenses....................................      4,552           3,190
                                                                -------          ------
Revenue in excess of certain expenses.......................    $ 5,872          $4,285
                                                                =======          ======
</TABLE>
 
                            See accompanying notes.
 
                                      F-97
<PAGE>   351
 
                                 PPM PROPERTIES
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The accompanying combined Statements of Revenue and Certain Expenses were
prepared for the purpose of complying with the rules and regulations of the
Securities and Exchange Commission for inclusion in the registration statement
on Form S-4 of Equity Office Properties Trust. The accompanying financial
statements are not representative of the actual operations of the Properties for
the periods presented nor indicative of future operations as certain expenses,
primarily depreciation, amortization and interest expense, which may not be
comparable to the expenses expected to be incurred by Equity Office Properties
Trust in future operations of the Properties, have been excluded.
 
  Revenue and Expense Recognition
 
     Revenue is recognized on a straight-line basis over the terms of the
related leases. Expenses are recognized in the period in which they are
incurred.
 
  Use of Estimates
 
     The preparation of the combined Statements of Revenue and Certain Expenses
in conformity with generally accepted accounting principles requires management
to make estimates and assumptions that affect the reported amounts of the
combined revenue and expenses during the reporting periods. Actual results could
differ from these estimates.
 
  Unaudited Interim Statement
 
     In the opinion of management, the interim financial statement reflects all
adjustments necessary for a fair presentation of the results of the interim
period. All such adjustments are of a normal, recurring nature.
 
2. DESCRIPTION OF PROPERTIES
 
     The accompanying combined Statements of Revenue and Certain Expenses relate
to the combined operations of the PPM Properties which are to be acquired by
Equity Office Properties Trust for approximately $92 million from an unrelated
party. The PPM Properties have been presented on a combined basis because all of
the Properties are under common control and management. The following properties
are included in the combined financial statements:
 
<TABLE>
<CAPTION>
                                                               APPROXIMATE
                                                                 RENTABLE
                       PROPERTY NAME                          SQUARE FOOTAGE
                       -------------                          --------------
<S>                                                           <C>
Lakeside Square.............................................     392,700
1600 Duke Street............................................      68,800
Fair Oaks Plaza.............................................     177,900
                                                                 -------
                                                                 639,400
                                                                 =======
</TABLE>
 
3. RENTALS
 
     The Properties have entered into tenant leases that provide for tenants to
share in the operating expenses and real estate taxes on a pro rata basis, as
defined.
 
4. RELATED PARTY TRANSACTIONS
 
     The Properties were managed by an affiliated party to the seller. The
management agreements provided for fees of 2.25% of gross receipts, as defined.
 
                                      F-98
<PAGE>   352
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE PARTNERS OF
BEACON PROPERTIES, L.P.:
 
     We have audited the consolidated balance sheets of Beacon Properties, L.P.
as of December 31, 1996 and 1995, and the related consolidated statements of
operations, partners' capital and cash flows for the years ended December 31,
1996 and 1995 and the period May 26, 1994 to December 31, 1994. We have also
audited the combined statement of operations, owners' equity and cash flows of
the Predecessor, more fully described in Note 1, for the period January 1, 1994
to May 25, 1994. These consolidated financial statements are the responsibility
of the Operating Partnership's management. Our responsibility is to express an
opinion on these consolidated financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the consolidated financial position of
Beacon Properties, L.P. as of December 31, 1996 and 1995 and the consolidated
results of its operations and its cash flows for the years ended December 31,
1996 and 1995 and the period May 26, 1994 to December 31, 1994, and the combined
results of operations and cash flows of the Predecessor for the period January
1, 1994 to May 25, 1994 in conformity with generally accepted accounting
principles.
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
January 21, 1997
 
                                      F-99
<PAGE>   353
 
                            BEACON PROPERTIES, L.P.
 
                          CONSOLIDATED BALANCE SHEETS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                     DECEMBER 31,
                                                                ----------------------
                                                                   1996         1995
                                                                   ----         ----
<S>                                                             <C>           <C>
ASSETS
Real estate:
  Land......................................................    $  213,858    $ 43,077
  Buildings, improvements and equipment.....................     1,477,672     428,065
                                                                ----------    --------
                                                                 1,691,530     471,142
  Less accumulated depreciation.............................        97,535      66,571
                                                                ----------    --------
                                                                 1,593,995     404,571
Deferred financing and leasing costs, net of accumulated
  amortization of $16,334 and $14,487.......................        17,287       9,438
Cash and cash equivalents...................................        35,896       4,481
Restricted cash.............................................         2,599       2,764
Accounts receivable.........................................        11,596       6,111
Accrued rent................................................        13,065       6,493
Prepaid expenses and other assets...........................           808       8,060
Mortgage notes receivable...................................        51,491      34,778
Investments in and advance to joint ventures and
  corporations..............................................        52,176      58,027
                                                                ----------    --------
     Total assets...........................................    $1,778,913    $534,723
                                                                ==========    ========
LIABILITIES AND PARTNERS' CAPITAL
Liabilities:
  Mortgage notes payable....................................       452,212      70,536
  Note payable, Credit Facility.............................       153,000     130,500
  Accounts payable, accrued expenses and other
     liabilities............................................        41,336      14,018
  Investment in joint venture...............................        24,735      23,955
                                                                ----------    --------
     Total liabilities......................................       671,283     239,009
Commitments and contingencies...............................            --          --
Limited partners' capital interest, 6,273,928 and 3,788,549
  units outstanding, at redemption value....................       229,783      87,137
                                                                ----------    --------
Partners' capital:
  Operating units issued and outstanding, 48,116,480 and
     20,215,822 General partner--outstanding 543,904 and
     240,044................................................        10,530       2,926
  Limited partner--outstanding 47,572,576 and 19,975,788....       867,317     205,651
                                                                ----------    --------
  Total partners' capital...................................       877,847     208,577
                                                                ----------    --------
  Total liabilities and partners' capital...................    $1,778,913    $534,723
                                                                ==========    ========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-100
<PAGE>   354
 
                            BEACON PROPERTIES, L.P.
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                (DOLLARS IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                                    PREDECESSOR
                                                                                                  ---------------
                                        FOR THE              FOR THE          FOR THE PERIOD      FOR THE PERIOD
                                      YEAR ENDED           YEAR ENDED         MAY 26, 1994 TO     JANUARY 1, 1994
                                   DECEMBER 31, 1996    DECEMBER 31, 1995    DECEMBER 31, 1994    TO MAY 25, 1994
                                   -----------------    -----------------    -----------------    ---------------
<S>                                <C>                  <C>                  <C>                  <C>
Revenues:
  Rental income..................     $  147,825           $   69,781           $   23,702            $5,776
  Management fees................          3,005                2,203                   --             1,521
  Recoveries from tenants........         16,719                9,524                4,395             1,040
  Mortgage interest income.......          4,970                2,546                   --                --
  Other income...................         11,249                5,985                2,671               675
                                      ----------           ----------           ----------            ------
                                         183,768               90,039               30,768             9,012
                                      ----------           ----------           ----------            ------
Expenses:
  Property expenses..............         37,210               17,698                6,497             2,086
  Real estate taxes..............         18,124                9,950                3,015               595
  General and administrative.....         19,218                9,444                2,943             1,399
  Mortgage interest expense......         30,300               15,220                4,970             2,798
  Interest -- amortization of
     financing costs.............          2,084                1,370                  617               373
  Depreciation and
     amortization................         33,170               17,233                6,727             2,385
                                      ----------           ----------           ----------            ------
                                         140,106               70,915               24,769             9,636
                                      ----------           ----------           ----------            ------
Income (loss) from operations....         43,662               19,124                5,999              (624)
Equity in net income of joint
  ventures and corporations......          4,899                3,103                  858               198
                                      ----------           ----------           ----------            ------
Income (loss) from continuing
  operations before minority
  interest.......................         48,561               22,227                6,857              (426)
Minority interest in partnerships
  and corporations...............            (15)                 (36)                  (8)              931
                                      ----------           ----------           ----------            ------
Income from continuing
  operations.....................         48,546               22,191                6,849               505
Discontinued operations --
  construction company:
  Income (loss) from
     operations..................         (2,609)                 (12)                 477               102
  Loss on sale...................           (249)                  --                   --                --
                                      ----------           ----------           ----------            ------
Income before extraordinary
  items..........................         45,688               22,179                7,326               607
Extraordinary items..............         (3,876)                  --                   --             8,898
                                      ----------           ----------           ----------            ------
Net income.......................     $   41,812           $   22,179           $    7,326            $9,505
                                      ==========           ==========           ==========            ======
Income before extraordinary items
  per unit.......................     $     1.32           $     1.09           $     0.48
                                      ==========           ==========           ==========
Extraordinary items per unit.....     $    (0.11)                  --                   --
                                      ==========           ==========           ==========
Net income per unit..............     $     1.21           $     1.09           $     0.48
                                      ==========           ==========           ==========
Weighted average units
  outstanding....................     34,446,907           20,323,327           15,270,899
                                      ==========           ==========           ==========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-101
<PAGE>   355
 
                            BEACON PROPERTIES, L.P.
 
                  CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL
              FOR THE PERIOD JANUARY 1, 1994 TO DECEMBER 31, 1996
                (DOLLARS IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                          LIMITED
                                                      GENERAL     LIMITED      TOTAL     PARTNERS'
                                                     PARTNER'S   PARTNER'S   PARTNER'S    CAPITAL
                                                      CAPITAL     CAPITAL     CAPITAL    INTEREST
                                                     ---------   ---------   ---------   ---------
<S>                                                  <C>         <C>         <C>         <C>
Owner's equity (Predecessor), at January 1, 1994...                                       $(57,954)
Contributions and other, net of distributions from
  January 1, 1994 to May 25, 1994..................                                          1,083
Net income from January 1, 1994 through May 25,
  1994.............................................                                          9,505
                                                       -------   ---------   ---------    --------
Balance, at May 25, 1994...........................                                        (47,366)
Capital contributions, net, May 26 - December 31,
  1994.............................................    $ 2,373   $ 182,884   $ 185,257       9,200
Net income, May 26 - December 31, 1994.............         73       5,582       5,655       1,671
Distributions, May 26 - December 31, 1994 ($0.96
  per unit)........................................       (147)    (11,197)    (11,344)     (3,382)
Adjustment to reflect limited partners' equity
  interest at redemption value.....................     (1,123)   (111,128)   (112,251)    112,251
                                                       -------   ---------   ---------    --------
Partners' capital, at December 31, 1994............      1,176      66,141      67,317      72,374
Capital contributions, net -- 1995.................      1,940     157,781     159,721         307
Net income -- 1995.................................        222      17,838      18,060       4,119
Distributions -- 1995 ($1.24 per unit).............       (262)    (21,216)    (21,478)     (4,706)
Adjustment to reflect limited partners' equity
  interest at redemption value.....................       (150)    (14,893)    (15,043)     15,043
                                                       -------   ---------   ---------    --------
Partners' capital, at December 31, 1995............      2,926     205,651     208,577      87,137
Capital contributions, net -- 1996.................      8,466     744,792     753,258      75,143
Net income -- 1996.................................        418      35,914      36,332       5,480
Distributions -- 1996 ($1.765 per unit)............       (583)    (50,083)    (50,666)     (7,631)
Adjustment to reflect limited partners' equity
  interest at redemption value.....................       (697)    (68,957)    (69,654)     69,654
                                                       -------   ---------   ---------    --------
Partners' capital, at December 31, 1996............    $10,530   $ 867,317   $ 877,847    $229,783
                                                       =======   =========   =========    ========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-102
<PAGE>   356
 
                            BEACON PROPERTIES, L.P.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                    PREDECESSOR
                                                                                                  ---------------
                                           FOR THE             FOR THE         FOR THE PERIOD     FOR THE PERIOD
                                         YEAR ENDED          YEAR ENDED        MAY 26, 1994 TO    JANUARY 1, 1994
                                      DECEMBER 31, 1996   DECEMBER 31, 1995   DECEMBER 31, 1994   TO MAY 25, 1994
                                      -----------------   -----------------   -----------------   ---------------
<S>                                   <C>                 <C>                 <C>                 <C>
Cash flows from operating
  activities:
  Net income........................     $    41,812          $  22,179           $   7,326           $ 9,505
                                         -----------          ---------           ---------           -------
  Adjustments to reconcile net
    income to net cash provided by
    operating activities:
    Increase in accrued rent........          (6,572)            (3,741)               (915)           (1,181)
    Depreciation, amortization and
      interest amortization of
      financing costs...............          35,254             18,603               7,344             2,848
    Equity in net income of joint
      ventures and corporations.....          (2,026)            (3,055)             (1,327)             (201)
    Loss from minority interest in
      combined partnerships.........              --                 --                  --            (1,519)
    Extraordinary items.............           3,876                 --                  --            (8,898)
    Deferred interest...............              --                 --                  --               367
    Increase in accounts
      receivable....................          (5,485)            (1,746)             (3,075)             (376)
    Decrease (increase) in prepaid
      expenses and other assets.....             (48)               (58)              2,541            (1,940)
    Increase (decrease) in accounts
      payable, accrued expenses and
      other liabilities.............          25,421                781                (739)            1,636
                                         -----------          ---------           ---------           -------
         Total adjustments..........          50,420             10,784               3,829            (9,264)
                                         -----------          ---------           ---------           -------
         Net cash provided by
           operating activities.....          92,232             32,963              11,155               241
                                         -----------          ---------           ---------           -------
Cash flows from investing
  activities:
  Property additions................      (1,088,775)           (67,610)           (190,015)             (978)
  Loans receivable--affiliate.......              --                 --             (14,594)               --
  Payment of deferred leasing
    costs...........................          (6,157)            (2,646)             (1,010)             (124)
  Decrease (increase) in prepaid
    expenses and other assets.......           5,000             (5,000)                 --                --
  Purchase of minority interests....              --                 --             (11,688)               --
  Investments in joint ventures.....              --                 --             (15,802)               --
  Capital distributions from joint
    ventures........................           8,610              3,518               2,508                --
  Investments in and advance to
    corporations....................              --            (41,471)             (5,800)               --
  Cash from contributed assets......              --                 --               6,978                --
  Restricted cash from contributed
    assets..........................              --                 --                 420                --
  Purchase of mortgage notes
    receivable......................         (16,713)           (34,778)                 --                --
  Decrease (increase) in restricted
    cash............................             165              2,063              (4,827)               --
                                         -----------          ---------           ---------           -------
         Net cash used by investing
           activities...............      (1,097,870)          (145,924)           (233,830)           (1,102)
                                         -----------          ---------           ---------           -------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-103
<PAGE>   357
 
                            BEACON PROPERTIES, L.P.
 
               CONSOLIDATED STATEMENTS OF CASH FLOWS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                    PREDECESSOR
                                                                                                  ---------------
                                           FOR THE             FOR THE         FOR THE PERIOD     FOR THE PERIOD
                                         YEAR ENDED          YEAR ENDED        MAY 26, 1994 TO    JANUARY 1, 1994
                                      DECEMBER 31, 1996   DECEMBER 31, 1995   DECEMBER 31, 1994   TO MAY 25, 1994
                                      -----------------   -----------------   -----------------   ---------------
<S>                                   <C>                 <C>                 <C>                 <C>
Cash flows from financing
  activities:
  Capital contributions.............     $  754,175           $ 160,028           $173,452            $   412
  Borrowings on Credit Facility.....        468,000             124,700            130,300                 --
  Borrowings on mortgage notes......        608,000                  --                 --                874
  Payments on Credit Facility.......       (445,500)           (124,500)                --                 --
  Repayments on mortgage notes......       (281,814)            (20,400)           (49,677)              (460)
  Advances (repayments) of amounts
    due to affiliates...............             --                  --             (5,355)             2,800
Payment of deferred financing
  costs.............................         (9,811)             (2,457)            (2,764)               (13)
Decrease (increase) in prepaid
  expenses and other assets.........          2,300              (2,300)                --                 --
Distributions.......................        (58,297)            (32,435)            (8,475)            (4,329)
                                         ----------           ---------           --------            -------
         Net cash provided by (used
           by) financing
           activities...............      1,037,053             102,636            237,481               (716)
                                         ----------           ---------           --------            -------
Net increase (decrease) in cash and
  cash equivalents..................         31,415             (10,325)            14,806             (1,577)
Cash and cash equivalents, beginning
  of period.........................          4,481              14,806                 --              6,150
                                         ----------           ---------           --------            -------
Cash and cash equivalents, end of
  period............................     $   35,896           $   4,481           $ 14,806            $ 4,573
                                         ==========           =========           ========            =======
Supplemental disclosures:
  Cash paid during the period for
    interest (net of capitalized
    interest).......................     $   28,777           $  14,738           $  5,278            $ 2,811
                                         ==========           =========           ========            =======
Noncash activities:
  Acquisition of interests in
    properties......................             --                  --           $ 22,721
                                         ==========           =========           ========
  Increase in partners' capital as a
    result of acquisition of
    interests in properties.........     $   74,226                  --           $  9,200
                                         ==========           =========           ========
  Liabilities assumed in connection
    with contributions and
    acquisition of properties.......     $   55,529           $     861           $ 93,518
                                         ==========           =========           ========
  Distributions payable to unit
    holders.........................             --                  --           $  6,251
                                         ==========           =========           ========
  Receivable from equity
    investment......................     $      769           $   1,040
                                         ==========           =========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-104
<PAGE>   358
 
                            BEACON PROPERTIES, L.P.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                             (DOLLARS IN THOUSANDS)
 
1. ORGANIZATION, OFFERINGS AND ACQUISITIONS:
 
     Beacon Properties, L.P. (the "Operating Partnership") was organized as a
Delaware limited partnership in April 1994 and commenced operations effective on
May 26, 1994. The Operating Partnership was formed to continue and expand the
commercial real estate development, construction, acquisition, leasing, design
and management business of The Beacon Group (the "Predecessor").
 
     Simultaneously with the closing of the initial public offering (the "IPO")
of Beacon Properties Corporation (the "Company"), which is the sole general
partner and a limited partner of the Operating Partnership, the Company
contributed its interests in two properties and approximately $173.4 million,
the net proceeds of the IPO, to the Operating Partnership in exchange for
partnership interests ("Units").
 
     The following schedule summarizes the Operating Partnership's interest in
the properties as a result of the initial and subsequent capital contributions
of the Company, and the related acquisition of properties and partnership
interests. All properties have been consolidated unless otherwise indicated in
the notes:
 
<TABLE>
<CAPTION>
                                                                     RENTABLE      OWNERSHIP
                                                           DATE       AREA IN     INTEREST AT    ACCOUNTING
                                                         ACQUIRED   SQUARE FEET    12/31/96     METHOD NOTES
                                                         --------   -----------   -----------   ------------
<S>                                                      <C>        <C>           <C>           <C>
PROPERTIES:
Wellesley Office Park -- Buildings 1-8, Wellesley,
  MA...................................................    (A)         622,862        100%        (E)
Crosby Corporate Center, Bedford, MA...................    (B)         336,000        100%
South Station, Boston, MA..............................    (B)         148,591        100%
175 Federal Street, Boston, MA.........................    (B)         203,349        100%        (E)
One Post Office Square, Boston, MA.....................    (B)         764,129         50%        (D)
Center Plaza, Boston, MA...............................    (B)         649,359        100%
Rowes Wharf, Boston, MA................................    (B)         344,326         45%        (F)
150 Federal Street, Boston, MA.........................    (B)         530,279        100%
Polk and Taylor Buildings, Arlington, VA...............    (B)         890,000          9%        (G)
One Canal Park, Cambridge, MA..........................  6/10/94       100,300        100%
Westwood Business Centre, Westwood, MA.................  6/10/94       160,400        100%
Russia Wharf, Boston, MA...............................  8/10/94       314,596        100%
Westlakes Office Park -- Buildings 1-3 and 5, Berwyn,
  PA...................................................    (C)         443,592        100%
75-101 Federal Street, Boston, MA......................  9/29/95       812,000         51%        (H)
2 Oliver Street--147 Milk Street, Boston, MA...........  10/6/95       271,000        100%
Ten Canal Park, Cambridge, MA..........................  12/21/95      110,000        100%
New England Executive Park, Burlington, MA.............  11/15/96      817,013        100%
245 First Street, Cambridge, MA........................  11/21/96      263,227        100%
Perimeter Center, Atlanta, GA..........................  2/15/96     3,302,136        100%
1300 North 17th Street, Rosslyn, VA....................  10/18/96      372,865        100%
1616 North Fort Myer Drive, Rosslyn, VA................  10/18/96      292,826        100%
John Marshall I, McLean, VA............................   9/5/96       261,364        100%
E.J. Randolph, McLean, VA..............................   9/5/96       164,677        100%
Northridge I, Reston/Herndon, VA.......................   9/5/96       124,319        100%
1333 H Street, N.W., Washington, D.C...................  8/16/96       238,694        100%
AT&T Plaza, Oak Brook, IL..............................  8/16/96       225,318        100%
Tri-State International, Lincolnshire, IL..............  8/16/96       548,000        100%
10960 Wilshire Boulevard, Westwood, CA.................  11/21/96      543,804        100%
Shoreline Technology Park, Mountain View, CA...........  12/20/96      727,000        100%
Lake Marriott Business Park, Santa Clara, CA...........  12/20/96      400,000        100%
Presidents Plaza, Chicago, IL..........................  12/27/96      791,000        100%
                                                                    ----------
                                                                    15,773,026
                                                                    ==========
</TABLE>
 
                                      F-105
<PAGE>   359
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                     RENTABLE      OWNERSHIP
                                                           DATE       AREA IN     INTEREST AT    ACCOUNTING
                                                         ACQUIRED   SQUARE FEET    12/31/96     METHOD NOTES
                                                         --------   -----------   -----------   ------------
<S>                                                      <C>        <C>           <C>           <C>
SERVICE ENTITIES:
Beacon Construction Company, Inc.......................    (B)                         99%        (I)
Beacon Property Management, L.P........................    (B)                        100%
Beacon Property Management Corporation.................    (B)                         99%        (I)
Beacon Design Corporation..............................    (B)                         99%        (I)
Beacon Design L.P......................................    (B)                        100%
</TABLE>
 
- -------------------------
(A) Wellesley Building 8 was acquired May 4, 1995. Interests in the remaining
    Wellesley Buildings were contributed as part of the initial public offering.
 
(B) Interests in this property or company were contributed or acquired as part
    of the initial public offering.
 
(C) Westlakes Buildings 1, 3 and 5 were acquired October 21, 1994, Westlakes
    Building 2 was acquired July 26, 1995.
 
(D) The Operating Partnership is a general partner in the joint venture which
    owns the property and utilizes the equity method of accounting for its
    investment.
 
(E) On October 28, 1994, the Operating Partnership acquired the remaining
    interest in the 175 Federal Street and Wellesley 6 Joint Venture which
    owned these properties. Prior to the acquisition of the remaining interest,
    the Operating Partnership used the equity method of accounting for its
    investments.
 
(F) The Operating Partnership owns an indirect limited partner interest and
    utilizes the equity method of accounting for its investment. (See Note 2.)
 
(G) The Operating Partnership owns a 9% limited partner interest and utilizes
    the equity method of accounting for its investment.
 
(H) The Operating Partnership is a shareholder in the corporation (private real
    estate investment trust) which owns the property, and utilizes the equity
    method of accounting for its investment.
 
(I) The Operating Partnership used the cost method of accounting for its
    investments in these subsidiaries prior to 1995. The Operating Partnership
    currently uses the equity method of accounting for its investments. (See
    Note 2.)
 
                                      F-106
<PAGE>   360
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
BUSINESS
 
     The Operating Partnership currently has interests in a portfolio of 104
Class A office properties and other commercial properties containing
approximately 15.8 million rentable square feet located in Boston, Atlanta,
Chicago, Los Angeles, San Francisco and Washington, D.C.
 
     The Operating Partnership also owns and operates commercial real estate
development, acquisition, leasing, design and management businesses. The
Operating Partnership currently manages approximately 2.9 million square feet of
commercial and office space owned by third parties in various locations,
including Boston, Waltham, and Springfield, Massachusetts and Chicago, Illinois.
 
PRINCIPLES OF CONSOLIDATION
 
     The accompanying financial statements of the Operating Partnership have
been prepared on a consolidated basis which include all the accounts of the
Operating Partnership and its subsidiaries. All significant intercompany
balances and transactions have been eliminated. The Operating Partnership's
consolidated financial statements reflect the properties acquired at their
historical basis of accounting to the extent of the acquisition of interests
from the Predecessors' owners who continued on as investors. The remaining
interests acquired from the Predecessors' owners have been accounted for as a
purchase and the excess of the purchase price over the related historical cost
basis was allocated to real estate.
 
     The accompanying financial statements of the Predecessor have been
presented on a combined basis which include all the contributed properties and
the management, leasing and design entities.
 
REAL ESTATE
 
     Buildings and improvements are recorded at cost and are depreciated on the
straight-line and declining balance methods over their estimated useful lives of
nineteen to forty years and fifteen to twenty years, respectively. The cost of
buildings and improvements includes the purchase price of the property or
interests in property, legal fees, acquisition costs and interest, property
taxes, capitalized interest, and other costs incurred during the period of
construction. The Operating Partnership capitalized interest costs of $1.0
million in 1996, $0.1 million in 1995, and $0 in 1994. In accordance with
Statement of Financial Accounting Standards No. 121, Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of, the
Operating Partnership periodically reviews its properties to determine if its
carrying costs will be recovered from future operating cash flows. In cases
where the Operating Partnership does not expect to recover its carrying costs,
the Operating Partnership recognizes an impairment loss. No such losses have
been recognized to date.
 
     Tenant improvements are depreciated over the terms of the related leases.
Furniture, fixtures and equipment are depreciated using the straight-line and
declining balance methods over their expected useful lives of five to seven
years.
 
     Expenditures for maintenance and repairs are charged to operations as
incurred. Significant renovations or betterments which extend the economic
useful life of the assets are capitalized.
 
DEFERRED FINANCING AND LEASING COSTS
 
     Deferred financing costs include fees and costs incurred to obtain
long-term financings, and are amortized over the terms of the respective loans
on a basis which approximates the interest method. Deferred leasing costs
incurred in the successful negotiation of leases, including brokerage, legal and
other costs, have been deferred and are being amortized on a straight-line basis
over the terms of the respective leases.
 
                                      F-107
<PAGE>   361
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
CASH AND CASH EQUIVALENTS
 
     Cash and cash equivalents consist of highly liquid assets with original
maturities of three months or less from the date of purchase. The majority of
the Operating Partnership's cash and cash equivalents are held at major
commercial banks. The Operating Partnership has not experienced any losses to
date on its invested cash. The carrying value of the cash and cash equivalents
approximates market.
 
RESTRICTED CASH
 
     Restricted cash consists of cash held in escrow as required by lenders to
satisfy real estate taxes and tenant improvement costs.
 
INVESTMENTS IN AND ADVANCE TO JOINT VENTURES AND CORPORATIONS
 
     The Operating Partnership uses the equity method of accounting for its
earnings in property joint ventures and corporations which it does not control.
Losses in excess of investments are not recorded where the Operating Partnership
is a limited partner and has not guaranteed nor intends to provide any future
financial support to the respective properties.
 
MORTGAGE NOTES RECEIVABLE
 
     Discounts from the principal balance on mortgage loans receivable, net of
acquisition costs, are amortized as interest income over the due date of the
related loans using the effective yield method, based on management's evaluation
of the current facts and circumstances and the ultimate ability to collect the
principal balances of such loans.
 
REVENUE RECOGNITION
 
     Base rental income is reported on a straight-line basis over the terms of
the respective leases. The impact of the straight-line rent adjustment increased
revenues for the Operating Partnership by $6.6 million, $3.7 million and $1.9
million and increased its proportionate share of equity in net income of
property joint ventures and corporations by $0.1 million, $0.2 million and $0.3
million for the years ended December 31, 1996 and 1995 and the period May 26,
1994 to December 31, 1994, respectively. Management fees are recognized as
revenue as they are earned.
 
INCOME TAXES
 
     Income taxes are not considered in the accompanying financial statements
since such taxes, if any, are the responsibility of the partners.
 
INTEREST RATE PROTECTION AGREEMENTS
 
     The Operating Partnership has entered into interest rate protection
agreements to reduce the impact of certain changes in interest rates. These
agreements are held for purposes other than trading. Amounts paid for the
agreements are amortized over the lives of the agreements on a basis which
approximates the interest method. Payments under interest rate swap agreements
are recognized as adjustments to interest expense when incurred. The Operating
Partnership's policy is to write off unamortized amounts paid under interest
rate protection agreements, when the related debt is paid off or there is a
termination prior to the maturity of the agreements. The Operating Partnership
is exposed to credit loss in the event of nonperformance by the other parties to
the interest rate protection agreements. However, the Operating Partnership does
not anticipate nonperformance by the counterparties.
 
                                      F-108
<PAGE>   362
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
RISKS AND UNCERTAINTIES
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amount of assets and liabilities and
disclosure of contingent assets and liabilities. Actual results could differ
from those estimates.
 
RECLASSIFICATIONS
 
     Certain prior year balances have been reclassed to conform with current
year presentation.
 
3. ACCOUNTS RECEIVABLE:
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                              ----------------
                                                               1996      1995
                                                               ----      ----
<S>                                                           <C>       <C>
Tenants.....................................................  $ 5,072   $2,137
Other.......................................................    4,228    1,006
Affiliates..................................................    3,670    3,305
Allowance for uncollectible amounts.........................   (1,374)    (337)
                                                              -------   ------
                                                              $11,596   $6,111
                                                              =======   ======
</TABLE>
 
4. MORTGAGE NOTES RECEIVABLE:
 
     The Operating Partnership acquired a fifty percent interest in certain
mortgages collateralized by property owned by a joint venture in which the
Operating Partnership has an indirect interest. The terms of the notes require
interest-only payments at 8.71% quarterly on a principal balance of
approximately $63.0 million and are due on April 1, 1999. The term may be
extended for up to three years under certain conditions. The Operating
Partnership also has an option to purchase from an affiliate other mortgage
interests collateralized by the same property.
 
                                      F-109
<PAGE>   363
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
5. INVESTMENTS IN AND ADVANCE TO JOINT VENTURES AND CORPORATIONS:
 
     The following is summarized financial information for the property joint
ventures and corporation:
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              -------------------
                                                                1996       1995
                                                                ----       ----
<S>                                                           <C>        <C>
Balance sheet:
  Real estate, net..........................................  $410,207   $419,096
  Other assets..............................................    51,669     55,714
                                                              --------   --------
                                                              $461,876   $474,810
                                                              ========   ========
  Mortgage notes payable....................................  $377,754   $380,827
  Loans and notes payable...................................    72,136     68,606
  Other liabilities.........................................    13,040     14,072
  Partners' and shareholders' equity (deficiency)...........    (1,054)    11,305
                                                              --------   --------
                                                              $461,876   $474,810
                                                              ========   ========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                PREDECESSOR
                                                                                              ----------------
                                    FOR THE YEAR        FOR THE YEAR       FOR THE PERIOD      FOR THE PERIOD
                                        ENDED               ENDED          MAY 26, 1994 TO    JANUARY 1, 1994
                                  DECEMBER 31, 1996   DECEMBER 31, 1995   DECEMBER 31, 1994   TO MAY 25, 1994
                                  -----------------   -----------------   -----------------   ---------------
<S>                               <C>                 <C>                 <C>                 <C>
Summary of operations:
  Rentals........................     $117,283             $91,048             $59,983            $38,386
  Other income...................        3,453               3,861               5,717              2,941
  Operating expenses.............       61,086              49,472              34,688             22,632
  Mortgage interest expense......       28,712              23,232              16,261             13,432
  Depreciation and
     amortization................       18,592              14,537              11,427              8,228
                                      --------             -------             -------            -------
  Net income (loss)..............     $ 12,346             $ 7,668             $ 3,324            $(2,965)
                                      ========             =======             =======            =======
</TABLE>
 
     A reconciliation of interests in property joint ventures and corporation to
the underlying net assets is as follows:
 
<TABLE>
<CAPTION>
                                                                      DECEMBER 31,
                                                              ----------------------------
                                                               1996      1995       1994
                                                               ----      ----       ----
<S>                                                           <C>       <C>       <C>
Partners' and shareholders' (deficiency) capital, as
  above.....................................................  $(1,054)  $11,305   $(51,742)
Deficits of other partners and shareholders.................   23,555    13,270     38,459
                                                              -------   -------   --------
Operating Partnership's share of equity (deficiency)........   22,501    24,575    (13,283)
Excess of cost of investments over the net book value of
  underlying net assets, net of amortization and accumulated
  amortization of $122, $75 and $28, respectively...........    1,310     1,357
                                                              -------   -------   --------
Carrying value of property investments in joint ventures and
  corporation...............................................  $23,811   $25,932   $(11,899)
                                                              =======   =======   ========
</TABLE>
 
                                      F-110
<PAGE>   364
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
     The following is summarized financial information for the service
corporations:
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                              -----------------
                                                               1996      1995
                                                               ----      ----
<S>                                                           <C>       <C>
Balance sheet:
  Equipment, net............................................  $ 1,806   $   715
  Other assets..............................................   34,155    29,560
                                                              $35,961   $30,275
                                                              =======   =======
  Other liabilities.........................................   37,360    27,124
  Shareholders' equity (deficiency).........................   (1,399)    3,151
                                                              -------   -------
                                                              $35,961   $30,275
                                                              =======   =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                   FOR THE YEAR        FOR THE YEAR       FOR THE PERIOD
                                                       ENDED               ENDED          MAY 26, 1994 TO
                                                 DECEMBER 31, 1996   DECEMBER 31, 1995   DECEMBER 31, 1994
                                                 -----------------   -----------------   -----------------
<S>                                              <C>                 <C>                 <C>
Summary of operations:
  Construction income...........................     $140,903            $108,913             $52,429
  Consulting and management fees................        2,537               7,576               4,848
  Interest and other income.....................          266                 383                 184
  Construction, consulting and management fee
     costs......................................      141,167             110,835              52,388
  General and administrative expense............        5,121               4,880               3,564
  Depreciation and amortization.................          584                 336                 186
  Minority interest in net income of joint
     venture....................................           52                 130                  90
  Interest expense to stockholder...............           --                 650                  --
                                                     --------            --------             -------
Net income (loss)...............................     $ (3,218)           $     41             $ 1,233
                                                     ========            ========             =======
</TABLE>
 
     A reconciliation of the underlying net assets to the Operating
Partnership's carrying value of investments in and advance to service
corporations is as follows:
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              -------------------
                                                                1996       1995
                                                                ----       ----
<S>                                                           <C>        <C>
Shareholders' equity, as above..............................  $ (1,399)  $  3,151
(Deficit) equity of other shareholders......................       (29)        11
                                                              --------   --------
Operating Partnership's share of equity.....................    (1,370)     3,140
Advance.....................................................     5,000      5,000
                                                              --------   --------
Carrying value of investments in and advance to service
  corporations..............................................     3,630      8,140
Carrying value of property investments in joint ventures and
  corporation per above.....................................    23,811     25,932
                                                              --------   --------
                                                              $ 27,441   $ 34,072
                                                              ========   ========
Per consolidated balance sheet:
  Investments in and advance to joint ventures and
     corporations...........................................  $ 52,176   $ 58,027
  Investment in joint venture...............................   (24,735)   (23,955)
                                                              --------   --------
                                                              $ 27,441   $ 34,072
                                                              ========   ========
</TABLE>
 
                                      F-111
<PAGE>   365
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
6. MORTGAGE NOTES PAYABLE:
 
     The mortgage notes payable collateralized by the certain properties and
assignment of leases, are as follows:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                                -------------------
                                                                  1996       1995
                                                                  ----       ----
<S>                                                             <C>         <C>
Mortgage notes with fixed interest at:
  8.00% maturing July 1, 1998...............................    $ 12,970    $13,236
  6.67% maturing November 1, 1998...........................      56,920     57,300
  7.23% maturing February 1, 2003...........................      55,000         --
  7.23% maturing March 1, 2003..............................      60,000         --
  7.08% maturing March 31, 2006.............................     218,000         --
  8.19% maturing January 1, 2007............................      15,000         --
  8.19% maturing January 1, 2007............................      13,600         --
  8.38% maturing December 1, 2008...........................      20,722         --
                                                                --------    -------
     Total mortgage notes payable...........................    $452,212    $70,536
                                                                ========    =======
</TABLE>
 
     The Operating Partnership's restricted cash consists of cash required by
these mortgages to be held in escrow for capital expenditures and/or real estate
taxes.
 
     Scheduled maturities of mortgage notes payable are as follows:
 
<TABLE>
<S>                                                             <C>
1997........................................................    $  2,127
1998........................................................      72,611
1999........................................................       6,602
2000........................................................       7,608
2001........................................................       8,171
Thereafter..................................................     355,093
                                                                --------
  Total.....................................................    $452,212
                                                                ========
</TABLE>
 
     The Operating Partnership determines the fair value of its mortgage notes
payable based upon the discounted cash flows at a discount rate that
approximates the Operating Partnership's effective borrowing rate. Based on its
evaluation, the Operating Partnership has determined that the fair value of its
mortgage notes approximates their carrying value.
 
     In March 1996, the Operating Partnership repaid a debt and recorded an
extraordinary item of $2.2 million in connection with the write-off of fees and
costs to acquire the debt. The extraordinary item during the period January 1,
1994 through May 25, 1994 represents the gains resulting from the settlement of
certain mortgage notes payable. As the prepayments were a condition to transfer
the assets to the Operating Partnership, these items were recorded by the
Predecessor entity.
 
7. NOTE PAYABLE -- CREDIT FACILITY:
 
     The Operating Partnership presently has a three-year, $300 million
revolving credit facility (the "Credit Facility"). The Credit Facility matures
in June 1999 and is collateralized by cross-collateralized mortgages and
assignment of rents on certain properties.
 
     Outstanding balances under the Credit Facility bear interest, at the
Company's option, at either (i) the higher of (x) Bank of Boston's base interest
rate and (y) one-half of one percent (1/2%) above the overnight
 
                                      F-112
<PAGE>   366
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
federal funds effective rate or (ii) the Eurodollar rate plus 175 basis points
(1.75%). The Company has an interest rate protection agreement through May 1997
with respect to $135 million of the Credit Facility, which provides for
offsetting payments to the Company in the event that 90-day LIBOR exceeds 9.47%
per annum. Effective May 1997 through May 1999, the Company has an interest rate
protection agreement with respect to $137.5 million of the Credit Facility,
which provides for offsetting payments to the Company in the event that 90-day
LIBOR exceeds 8.75% per annum. This interest rate protection arrangement may be
applied during four quarters of the period May 1997 to May 1999.
 
     The outstanding balance of the Credit Facility at December 31, 1996 was
$153.0 million. The weighted average amount outstanding during the years ended
December 31, 1996 and 1995 and the period May 26, 1994 to December 31, 1994 was
$42.3 million, $99.7 million and $50.4 million, respectively. The weighted
average interest rate on amounts outstanding during the years ended December 31,
1996 and 1995 and the period May 26, 1994 to December 31, 1994 was approximately
7.78%, 8.25% and 7.57%, respectively. The applicable interest rate under the
Credit Facility at December 31, 1996 was 8.25%.
 
     Based upon the Credit Facility's variable interest rate, the Operating
Partnership has determined that the fair value of the Credit Facility
approximates its carrying value. The Operating Partnership determines the fair
value of its interest rate agreement based upon the quoted market prices of
similar instruments. Based on this analysis, the Operating Partnership has
determined that the fair value of this instrument approximates its carrying
value.
 
     As a result of the substantial modification of the terms of the Credit
Facility, the Company recorded an extraordinary item of $1.7 million in
connection with the write-off of fees and costs relating to the prior Credit
Facility.
 
8. ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER LIABILITIES:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                                ------------------
                                                                 1996       1995
                                                                 ----       ----
<S>                                                             <C>        <C>
Accounts payable and accrued expenses.......................    $29,139    $ 8,088
Deferred revenue and other..................................      4,912      1,164
Affiliates..................................................      1,595      2,952
Other liabilities...........................................        504        647
Security deposits...........................................      5,186      1,167
                                                                -------    -------
                                                                $41,336    $14,018
                                                                =======    =======
</TABLE>
 
9. TRANSACTIONS WITH AFFILIATES:
 
<TABLE>
<CAPTION>
                                                                                                    PREDECESSOR
                                                                                                  ---------------
                                        FOR THE              FOR THE          FOR THE PERIOD      FOR THE PERIOD
                                      YEAR ENDED           YEAR ENDED         MAY 26, 1994 TO     JANUARY 1, 1994
                                   DECEMBER 31, 1996    DECEMBER 31, 1995    DECEMBER 31, 1994    TO MAY 25, 1994
                                   -----------------    -----------------    -----------------    ---------------
<S>                                <C>                  <C>                  <C>                  <C>
Management, rental, design,
  construction fees and interest
  income.........................       $9,176               $ 5,640                 --               $1,809
Construction costs...............        8,352                11,108               $241                   --
Administrative salaries and
  expenses.......................           --                    --                 --                  469
</TABLE>
 
     In 1995, the Operating Partnership entered into an agreement to lease its
home office from a joint venture in which the Operating Partnership has an
indirect interest. It previously subleased home office space from
 
                                      F-113
<PAGE>   367
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
another affiliate. Rental expense related to these arrangements was $1.3
million, $0.3 million and $0.1 million for the years ended December 31, 1996 and
1995 and the period May 26, 1994 to December 31, 1994, respectively.
 
     Future minimum rental payments at December 31, 1996 for the Operating
Partnership's home office are $1.3 million for 1997, $1.4 million for 1998
through 2001, and $1.0 million for 2002.
 
10. LIMITED PARTNERS' CAPITAL INTEREST
 
     Pursuant to the Operating Partnership Agreement, certain limited partners
in the Operating Partnership have the right to redeem all or any portion of
their Units for cash from the Operating Partnership or, at the election of the
Company, for shares of common stock or cash as selected by the Company. The
amount of cash to be paid to the limited partner if the redemption right is
exercised and the cash option is selected will be based on the trading price of
the Company's common stock at that time.
 
     Such limited partners' redemption rights are not included in partners'
capital. Accordingly, the accompanying consolidated balance sheets have been
retroactively reclassified to reflect the limited partners' capital interest in
the Operating Partnership, measured at redemption value. This reclassification
results in a reduction of partners' equity of $69.7 million and $15.0 million as
of December 31, 1996 and 1995, respectively as a result of the increase in the
redemption value.
 
11. COMMITMENTS AND CONTINGENCIES:
 
PENSION PLAN
 
     The Operating Partnership participates in a multiemployer defined-benefit
pension plan with some of its affiliates. This plan covered substantially all
full-time nonunion employees. The Operating Partnership's portion of pension
expense for the years ended December 31, 1996 and 1995 and the period May 26,
1994 to December 31, 1994, was $0.2 million, $0.1 million, and $0.1 million,
respectively. The Predecessor's comparable allocated portion of pension expense
amounted to $0.1 million for the period January 1, 1994 to May 25, 1994.
 
401(K) PLAN
 
     The eligible employees of the Operating Partnership participate in a
contributory savings plan with some of its affiliates. Under the plan, the
Operating Partnership may match contributions made by eligible employees based
on a percentage of the employee's salary. Currently, the Operating Partnership
matches 25% of contributions up to 3% of such employee's salary (up to $30). The
matching amount may be changed from time to time by the Board of Directors of
the Company. Expenses under this plan for 1996, 1995 and 1994 were not material.
 
CONTINGENCIES
 
     The Operating Partnership is subject to various legal proceedings and
claims that arise in the ordinary course of business. These matters are
generally covered by insurance. Management believes that the final outcome of
such matters will not have a material adverse effect on the financial position,
results of operations or liquidity of the Operating Partnership.
 
LEASE
 
     The South Station property is subject to a ground lease expiring in 2024.
The lease provides two 15-year extension options. Under certain conditions, the
lessor reserves the right to terminate the lease at the end of
 
                                      F-114
<PAGE>   368
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
the initial term or at the end of the first extension period and pay the lessee
an amount based on a formula payment of fair value. The minimum rents in
connection with the lease are substantially based on percentage rent until 1997.
The Operating Partnership is obligated to provide loans to the lessor under
certain conditions subject to a maximum of $0.9 million. As of December 31,
1996, no loans were outstanding.
 
ENVIRONMENTAL
 
     A former tenant of Crosby Corporate Center has agreed to perform the
necessary investigation and cleanup actions regarding remediation of possible
contamination, bear all costs associated with such cleanup activities and
indemnify the Operating Partnership for any costs or damages it incurs in
connection with such contamination. As the owner of the property, however, the
Operating Partnership could be held liable for the costs of such activities if
the former tenant fails to undertake such actions.
 
     As a lessee of certain property, the Operating Partnership has received an
indemnity from the owner to the extent the Operating Partnership is assessed
costs relating to environmental cleanup.
 
     Site assessments at the New England Executive Park have identified
contamination in the groundwater at a monitoring well which flows into an
aquifer, which supplies drinking water to the Town of Burlington. The Town of
Burlington has allocated funds for, and is in the process of constructing, a
groundwater treatment facility at its drinking water supply that draws from the
subject aquifer. The Operating Partnership has been advised that such treatment
facility has the capacity to treat any contaminants which may be derived from
the groundwater passing beneath the New England Executive Park. Although the
Town's water treatment facility does not relieve the Operating Partnership of
potential liability for the presence of the contaminants, the Operating
Partnership does not believe that any such liability would have a material
adverse effect on the Operating Partnership.
 
     Based on site assessments performed at 245 First Street which have
identified the presence of oil that slightly exceeds the concentration that
requires reporting to the Massachusetts Department of Environmental Protection,
an environmental consultant has advised the Operating Partnership that
applicable regulatory requirements can be satisfied without the need to perform
any remediation at the property. The Operating Partnership could be held liable
for costs associated with the contamination that has been identified, although
the Operating Partnership does not believe that such costs would have a material
adverse effect on the Operating Partnership.
 
     In connection with the acquisition of the John Marshall land, the sellers
have reported the findings of contamination to the Virginia Department of
Environmental Quality and have retained an environmental consultant to prepare a
remediation plan. Units valued at approximately $1.0 million were escrowed from
the purchase price to be released to the seller upon performance of remediation
pursuant to a remediation plan approved by the Operating Partnership. The escrow
further provides that the Operating Partnership may receive some or all of the
remaining escrowed Units upon certain conditions.
 
     Management does not believe that any costs, if incurred, would have a
material adverse effect on the financial condition, annual results of
operations, or liquidity of the Operating Partnership.
 
OTHER
 
     The Operating Partnership has an obligation to pay $17.0 million in
connection with the acquisition of real estate upon the achievement of
conditions regarding occupancy or rental income levels.
 
     In connection with the acquisition of the John Marshall I, E.J. Randolph
and Northridge I properties, the Operating Partnership has agreed to maintain
the non-recourse financing assumed from the sellers for a five year period and
not to dispose of the property for a seven year period. If the Operating
Partnership should
 
                                      F-115
<PAGE>   369
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
choose not to maintain the non-recourse provisions of the existing or new debt,
or sell the properties, within these respective time periods it shall be
required to make payments to the sellers of approximately $6.0 million in 1997,
reducing ratably to zero through 2003.
 
12. FUTURE MINIMUM RENTS:
 
     Future minimum rentals to be received under noncancelable tenant leases for
all fully consolidated properties at December 31, 1996 are due for years ended
December 31 as follows:
 
<TABLE>
<S>                                                         <C>
1997........................................................  $  188,032
1998........................................................     175,732
1999........................................................     170,086
2000........................................................     143,288
2001........................................................     113,718
Thereafter..................................................     370,698
                                                              ----------
     Total future minimum rents.............................  $1,161,554
                                                              ==========
</TABLE>
 
13. GEOGRAPHIC CONCENTRATION:
 
     The Operating Partnership owns properties with a total cost at December 31,
1996 as follows:
 
<TABLE>
<S>                                                           <C>
Downtown Boston.............................................  $  284,574
Suburban Boston.............................................     279,987
Suburban Atlanta............................................     343,014
Suburban Philadelphia.......................................      59,018
Suburban Virginia...........................................     178,166
Downtown Los Angeles........................................     133,307
Suburban San Francisco......................................     184,207
Suburban Chicago............................................     175,819
Downtown Washington.........................................      53,438
                                                              ----------
                                                              $1,691,530
                                                              ==========
</TABLE>
 
14. PRO FORMA RESULTS (UNAUDITED):
 
     The following unaudited pro forma operating results for the Operating
Partnership have been prepared as if capital contributions and property
acquisitions during 1995 and 1996 had occurred on January 1, 1995. Unaudited pro
forma financial information is presented for informational purposes only and may
not be indicative of what the actual results of operations of the Operating
Partnership would have been had the events occurred as of January 1, 1995, nor
does it purport to represent the results of operations for future periods. Pro
forma results have not been presented for 1994 as the Operating Partnership's
operations did not commence until May 26, 1994.
 
<TABLE>
<CAPTION>
                                                           FOR THE YEAR ENDED
                                                              DECEMBER 31,
                                                           -------------------
                                                             1996       1995
                                                             ----       ----
<S>                                                        <C>        <C>
Revenues.................................................  $299,124   $265,878
Income before extraordinary items........................    84,619     79,007
Net income...............................................    80,728     79,007
Net income per unit......................................      1.48       1.45
</TABLE>
 
                                      F-116
<PAGE>   370
 
                            BEACON PROPERTIES, L.P.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- CONTINUED
                             (DOLLARS IN THOUSANDS)
 
15. DISCONTINUED OPERATIONS:
 
     On December 31, 1996, certain assets of the construction company were sold.
These assets included fixed assets, general construction contracts in progress,
and the receivables and payables related to these contracts. All employees were
transferred to the buyer who is expected to complete all outstanding
construction work for projects not purchased as part of the sale.
 
16. SUBSEQUENT EVENTS:
 
DECLARATION OF DISTRIBUTION
 
     On January 28, 1997, the Operating Partnership declared a quarterly
distribution of $25.2 million, payable on February 28, 1997 to partners of
record on February 10, 1997.
 
                                      F-117
<PAGE>   371
 
       REPORT OF INDEPENDENT ACCOUNTANTS ON FINANCIAL STATEMENT SCHEDULES
 
To the Partners of Beacon Properties L.P.:
 
     Our report on the consolidated financial statements of Beacon Properties
L.P. is included on page F-1 of this Form 10. In connection with our audits of
such financial statements, we have also audited the related financial statement
schedules listed in the Item 15(a) of this Form 10.
 
     In our opinion, the financial statement schedules referred to above, when
considered in relation to the basic financial statements taken as a whole,
present fairly, in all material respects, the information required to be
included therein.
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
January 21, 1997
 
                                      F-118
<PAGE>   372
 
                                  SCHEDULE III
                            BEACON PROPERTIES, L.P.
 
                    REAL ESTATE AND ACCUMULATED DEPRECIATION
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 INITIAL COST
                                                                           ------------------------
                                                                                      BUILDINGS AND
                       DESCRIPTION                          ENCUMBRANCES     LAND     IMPROVEMENTS
                       -----------                          ------------     ----     -------------
<S>                                                         <C>            <C>        <C>
Commercial Property:
Wellesley Office Park -- Buildings 1-8 -- Wellesley, MA...    $ 55,000     $  9,110    $   75,829
Crosby Corporate Center -- Bedford, MA....................          --(1)       978        10,478
South Station -- Boston, MA...............................          --           --        21,487
175 Federal St. -- Boston, MA.............................      12,970        1,404        24,505
Center Plaza -- Boston, MA................................      60,000        7,301        65,712
150 Federal St. -- Boston, MA.............................      56,920(2)    11,265       101,280
One Canal Park -- Cambridge, MA...........................          --(1)       931         8,444
Ten Canal Park -- Cambridge, MA...........................          --(1)     1,179        10,609
2 Oliver Street -- Boston, MA.............................          --(1)     1,796        16,166
Westwood Business Centre -- Westwood, MA..................          --(1)     1,159        10,498
Russia Wharf -- Boston, MA................................          --(1)     1,442        12,974
Westlakes Office Park -- Buildings 1, 2, 3 and 5 --
  Berwyn, PA..............................................          --(1)     6,335        46,267
Perimeter Center -- Atlanta, GA...........................     218,000       46,438       292,305
AT&T Plaza -- Oak Brook, IL...............................          --(1)     3,510        31,587
Tri-State International -- Lincolnshire, IL...............          --(1)     6,222        55,999
1333H Street, N.W. -- Washington, D.C.....................          --(1)     5,337        48,033
E.J. Randolph -- McLean, VA...............................      15,000        3,590        19,520
John Marshall I -- McLean, VA.............................      20,722        5,996        27,991
Northridge I -- Herndon, VA...............................      13,600        1,911        19,264
1300 North 17th Street -- Rosslyn, VA.....................          --(1)     8,007        46,758
1616 North Fort Myer Drive -- Rosslyn, VA.................          --(1)     6,156        38,651
New England Executive Park -- Burlington, MA..............          --(1)     7,067        68,259
10960 Wilshire Boulevard -- Westwood, CA..................          --       11,200       122,039
245 First Street -- Cambridge, MA.........................          --        4,513        40,616
Shoreline Technology Park -- Mountain View, CA............          --       39,547       101,444
Lake Marriott Business Park -- Santa Clara, CA............          --       12,032        31,128
Presidents Plaza -- Chicago, IL...........................          --        7,750        69,752
                                                              --------     --------    ----------
                                                              $452,212     $212,176    $1,417,595
                                                              ========     ========    ==========
</TABLE>
 
                                      F-119
<PAGE>   373
 
                                  SCHEDULE III
                            BEACON PROPERTIES, L.P.
 
             REAL ESTATE AND ACCUMULATED DEPRECIATION -- CONTINUED
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                 SUBSEQUENT                  GROSS AMOUNT AT WHICH
                                               TO ACQUISITION              CARRIED AT CLOSE OF PERIOD
                                           ----------------------    --------------------------------------
                                                      BUILDINGS                   BUILDINGS
            COST CAPITALIZED                             AND                         AND
               DESCRIPTION                  LAND     IMPROVEMENTS      LAND      IMPROVEMENTS      TOTAL
               -----------                  ----     ------------      ----      ------------      -----
<S>                                        <C>       <C>             <C>         <C>             <C>
Commercial Property:
Wellesley Office Park -- Buildings 1-8 --
  Wellesley, MA..........................      --      $12,866       $  9,110     $   88,695     $   97,805
Crosby Corporate Center -- Bedford, MA...  $1,505       14,880          2,483         25,358         27,841
South Station -- Boston, MA..............      --          861             --         22,348         22,348
175 Federal St. -- Boston, MA............      --        3,196          1,404         27,701         29,105
Center Plaza -- Boston, MA...............      --        8,810          7,301         74,522         81,823
150 Federal St. -- Boston, MA............      --        1,326         11,265        102,606        113,871
One Canal Park -- Cambridge, MA..........      --          139            931          8,583          9,514
Ten Canal Park -- Cambridge, MA..........      --          135          1,179         10,744         11,923
2 Oliver Street -- Boston, MA............      --        1,376          1,796         17,542         19,338
Westwood Business Centre -- Westwood,
  MA.....................................      --          674          1,159         11,172         12,331
Russia Wharf -- Boston, MA...............     177        3,496          1,619         16,470         18,089
Westlakes Office Park -- Buildings 1, 2,
  3 and 5 -- Berwyn, PA..................      --        6,416          6,335         52,683         59,018
Perimeter Center -- Atlanta, GA..........      --        4,271         46,438        296,576        343,014
AT&T Plaza -- Oak Brook, IL..............      --           18          3,510         31,605         35,115
Tri-State International -- Lincolnshire,
  IL.....................................      --          950          6,222         56,949         63,171
1333H Street, N.W. -- Washington, D.C....      --           68          5,337         48,101         53,438
E.J. Randolph -- McLean, VA..............      --           36          3,590         19,556         23,146
John Marshall I -- McLean, VA............      --          147          5,996         28,138         34,134
Northridge I --Herndon, VA...............      --           41          1,911         19,305         21,216
1300 North 17th Street -- Rosslyn, VA....      --           11          8,007         46,769         54,776
1616 North Fort Myer Drive -- Rosslyn,
  VA.....................................      --           87          6,156         38,738         44,894
New England Executive Park -- Burlington,
  MA.....................................      --           64          7,067         68,323         75,390
10960 Wilshire Boulevard -- Westwood,
  CA.....................................      --           68         11,200        122,107        133,307
245 First Street -- Cambridge, MA........      --           54          4,513         40,670         45,183
Shoreline Technology Park -- Mountain
  View, CA...............................      --           49         39,547        101,493        141,040
Lake Marriott Business Park -- Santa
  Clara, CA..............................      --            7         12,032         31,135         43,167
Presidents Plaza -- Chicago, IL..........      --           31          7,750         69,783         77,533
                                           ------      -------       --------     ----------     ----------
                                           $1,682      $60,077       $213,858     $1,477,672     $1,691,530
                                           ======      =======       ========     ==========     ==========
</TABLE>
 
                                      F-120
<PAGE>   374
 
                                  SCHEDULE III
                            BEACON PROPERTIES, L.P.
 
             REAL ESTATE AND ACCUMULATED DEPRECIATION -- CONTINUED
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                             LIFE ON WHICH
                                                                                             DEPRECIATION
                                                                                               IN LATEST
                                                                 DATE OF                        INCOME
                                               ACCUMULATED    CONSTRUCTION/       DATE        STATEMENTS
                 DESCRIPTION                   DEPRECIATION    RENOVATION       ACQUIRED      IS COMPUTED
                 -----------                   ------------   -------------     --------     -------------
<S>                                            <C>            <C>             <C>            <C>
Commercial Property:
Wellesley Office Park -- Buildings 1-8 --
  Wellesley, MA..............................     $33,913       1963-1984        1994/1995         (3)
Crosby Corporate Center -- Bedford, MA.......       6,702            1981          5/26/94         (3)
South Station -- Boston, MA..................      13,434            1988          5/26/94         (3)
175 Federal St. -- Boston, MA................       7,258            1977         10/28/94         (3)
Center Plaza -- Boston, MA...................       5,884       1966-1969         12/01/94         (3)
150 Federal St. -- Boston, MA................       8,961            1988          5/26/94         (3)
One Canal Park -- Cambridge, MA..............         770            1987          6/10/94         (3)
Ten Canal Park -- Cambridge, MA..............         386            1987         12/20/95         (3)
2 Oliver Street -- Boston, MA................         783       1982-1988         10/06/95         (3)
Westwood Business Centre -- Westwood, MA ....       1,083            1985          6/10/94         (3)
Russia Wharf -- Boston, MA...................       1,453       1978-1982          8/10/94         (3)
Westlakes Office Park -- Buildings 1, 2, 3
  and 5 -- Berwyn, PA........................       3,931       1988-1990     7/95 & 10/94         (3)
Perimeter Center -- Atlanta, GA..............       8,822       1970-1989          2/15/96         (3)
AT&T Plaza -- Oak Brook, IL..................         395            1984          8/16/96         (3)
Tri-State International -- Lincolnshire,
  IL.........................................         710            1986          8/16/96         (3)
1333H Street, N.W. -- Washington, D.C........         601            1984          8/16/96         (3)
E.J. Randolph -- McLean, VA..................         217            1983          9/05/96         (3)
John Marshall I -- McLean, VA................         306            1981          9/05/96         (3)
Northridge I -- Herndon, VA..................         214            1988          9/05/96         (3)
1300 North 17th Street -- Rosslyn, VA........         325            1980         10/18/96         (3)
1616 North Fort Myer Drive -- Rosslyn, VA....         271            1974         10/18/96         (3)
New England Executive Park -- Burlington,
  MA.........................................         291       1970-1985         11/15/96         (3)
10960 Wilshire Boulevard -- Westwood, CA.....         439       1971-1992         11/21/96         (3)
245 First Street -- Cambridge, MA............         170       1985-1986         11/21/96         (3)
Shoreline Technology Park -- Mountain View,
  CA.........................................         141       1985-1991         12/20/96         (3)
Lake Marriott Business Park -- Santa Clara,
  CA.........................................          43            1981         12/20/96         (3)
Presidents Plaza -- Chicago, IL..............          32       1980-1982         12/27/96         (3)
                                                  -------
                                                  $97,535
                                                  =======
</TABLE>
 
- -------------------------
(1) These properties are collateral for a Note Payable under the Credit
    Facility. The outstanding balance under the Note at December 31, 1996 is
    $153,000.
 
(2) This property is comprised of two Units. Unit A is collateral for a Note
    Payable under the Credit Facility. Unit B is collateral for a Mortgage Note
    Payable in the amount of $56,920.
 
(3) Buildings and improvements -- 19 to 40 years; Personal property -- 5 to 10
    years; tenant improvements -- over the terms of the related leases.
 
                                      F-121
<PAGE>   375
 
                                  SCHEDULE III
                            BEACON PROPERTIES, L.P.
 
             REAL ESTATE AND ACCUMULATED DEPRECIATION -- CONTINUED
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
     Depreciation of building and improvements and personal property is
calculated over the following estimated useful lives, using straight line and
declining balance methods:
 
     Buildings and improvements -- 19 to 40 years
 
     Tenant Improvements -- over the terms of the related leases
 
     Personal property -- 5 to 10 years
 
     The aggregate cost for federal income tax purposes was approximately
$1,390.3 million at December 31, 1996.
 
     The changes in total real estate assets for the years ended December 31,
1996 and 1995, the period May 26, 1994 to December 31, 1994 and the period
January 1, 1994 to May 25, 1994 are as follows:
 
<TABLE>
<CAPTION>
                                                                COMPANY                  PREDECESSOR
                                                 -------------------------------------   ------------
                                                                         MAY 26, 1994    JAN. 1, 1994
                                                                              TO              TO
                                                    1996        1995     DEC. 31, 1994   MAY 25, 1994
                                                    ----        ----     -------------   ------------
<S>                                              <C>          <C>        <C>             <C>
Balance, beginning of period...................  $  471,142   $400,419      $207,013*      $81,220
Acquisitions, Construction Costs and
  Improvements.................................   1,220,388     70,723       193,406           978
                                                 ----------   --------      --------       -------
Balance, end of period.........................  $1,691,530   $471,142      $400,419       $82,198
                                                 ==========   ========      ========       =======
</TABLE>
 
- -------------------------
* Represents initial acquisition cost of properties in the formation of the
  Company.
 
     The changes in accumulated depreciation for the years ended December 31,
1996 and 1995, the period May 26, 1994 to December 31, 1994 and the period
January 1, 1994 to May 25, 1994 are as follows:
 
<TABLE>
<CAPTION>
                                                                  COMPANY                  PREDECESSOR
                                                    ------------------------------------   ------------
                                                                           MAY 26, 1994    JAN. 1, 1994
                                                                                TO              TO
                                                     1996         1995     DEC. 31, 1994   MAY 25, 1994
                                                     ----         ----     -------------   ------------
<S>                                                 <C>          <C>       <C>             <C>
Balance, beginning of period......................  $66,571      $51,115      $45,044**      $37,167
Depreciation for period...........................   30,964       15,456        6,071          2,055
                                                    -------      -------      -------        -------
Balance, end of period............................  $97,535      $66,571      $51,115        $39,222
                                                    =======      =======      =======        =======
</TABLE>
 
- -------------------------
** Balance reflects prior accumulated depreciation carried over due to
   accounting for formation acquisitions as poolings of interests.
 
                                      F-122
<PAGE>   376
 
                                  SCHEDULE IV
                            BEACON PROPERTIES, L.P.
 
                         MORTGAGE LOANS ON REAL ESTATE
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                                 PRINCIPAL
                                                                                                                 AMOUNT OF
                                                                                   FACE                       LOANS SUBJECT TO
                                               FINAL       PERIODIC               AMOUNT       CARRYING          DELINQUENT
                                   INTEREST   MATURITY      PAYMENT      PRIOR      OF        AMOUNT OF          PRINCIPAL
       COMMERCIAL PROPERTY           RATE       DATE         TERM        LIENS   MORTGAGES   MORTGAGES(1)       OR INTEREST
       -------------------         --------   --------     --------      -----   ---------   ------------     ----------------
<S>                                <C>        <C>        <C>             <C>     <C>         <C>            <C>
Rowes Wharf......................    8.71%     4/1/99    Interest-only    --      $63,000      $51,491              --
  Boston, MA
</TABLE>
 
- -------------------------
(1) The aggregate cost of the Company's mortgage loans for federal income tax
purposes $51,491 at December 31, 1996.
 
     Reconciliation of Mortgage Loans on real estate for the year ended December
31:
 
<TABLE>
<CAPTION>
                                                               1996
                                                               ----
<S>                                                           <C>
Balance at beginning of year................................  $34,778
  Additions during period:
     Acquisition of mortgage loans..........................   16,713
  Deductions during period:
     Principal collections..................................       --
                                                              -------
Balance at end of year......................................  $51,491
                                                              =======
</TABLE>
 
                                      F-123
<PAGE>   377
 
                              225 FRANKLIN STREET
                             BOSTON, MASSACHUSETTS
 
                        STATEMENT OF EXCESS OF REVENUES
                        OVER SPECIFIC OPERATING EXPENSES
 
                      FOR THE YEAR ENDED DECEMBER 31, 1996
 
                                      F-124
<PAGE>   378
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Partners of Beacon Properties, L.P.
 
     We have audited the accompanying statement of excess of revenues over
specific operating expenses of 225 Franklin Street in Boston, Massachusetts (the
"Property") for the year ended December 31, 1996. This financial statement is
the responsibility of Beacon Properties, L.P.'s management. Our responsibility
is to express an opinion on this financial statement based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the statement of excess of revenues over
specific operating expenses is free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the statement. An audit also includes assessing the accounting principles used
and significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audit provides a
reasonable basis for our opinion.
 
     As described in Note 2, this financial statement excludes certain income
and expenses which would not be comparable with those resulting from the
operations of the Property after acquisition by Beacon Properties, L.P. The
accompanying financial statement was prepared for the purpose of complying with
the rules and regulations of the Securities and Exchange Commission and is not
intended to be a complete presentation of the Property's revenues and expenses.
 
     In our opinion, the financial statement referred to above presents fairly,
in all material respects, the excess of revenues over specific operating
expenses (exclusive of income and expenses described in Note 2) of 225 Franklin
Street in Boston, Massachusetts for the year ended December 31, 1996 in
conformity with generally accepted accounting principles.
 
                                             /s/ COOPERS & LYBRAND L.L.P.
 
Boston, Massachusetts
May 29, 1997
 
                                      F-125
<PAGE>   379
 
                              225 FRANKLIN STREET
                             BOSTON, MASSACHUSETTS
 
                        STATEMENT OF EXCESS OF REVENUES
                        OVER SPECIFIC OPERATING EXPENSES
 
<TABLE>
<CAPTION>
                                                                  FOR THE YEAR       FOR THE THREE
                                                                      ENDED           MONTHS ENDED
                                                                DECEMBER 31, 1996    MARCH 31, 1997
                                                                -----------------    --------------
                                                                                      (UNAUDITED)
<S>                                                             <C>                  <C>
Revenues:
  Base rent.................................................       $24,171,715         $6,727,809
  Recoveries from tenants...................................         5,526,823          1,321,475
  Other income..............................................         1,230,118             89,731
                                                                   -----------         ----------
                                                                    30,928,656          8,139,015
                                                                   -----------         ----------
Specific operating expenses (Note 2):
  Utilities.................................................         1,226,621            389,319
  Janitorial and cleaning...................................           845,436            235,719
  Heating, ventilation and air conditioning.................         1,138,787            280,952
  General and administrative................................           843,821            201,066
  Repairs and maintenance...................................         1,637,636            341,749
  Insurance.................................................           244,437             10,259
  Property taxes............................................         3,846,365            921,669
                                                                   -----------         ----------
                                                                     9,783,103          2,380,733
                                                                   -----------         ----------
Excess of revenues over specific operating expenses.........       $21,145,553         $5,758,282
                                                                   ===========         ==========
</TABLE>
 
    The accompanying notes are an integral part of the financial statement.
 
                                      F-126
<PAGE>   380
 
                              225 FRANKLIN STREET
                             BOSTON, MASSACHUSETTS
 
                    NOTES TO STATEMENT OF EXCESS OF REVENUES
                        OVER SPECIFIC OPERATING EXPENSES
 
1. ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES:
 
DESCRIPTION OF PROPERTIES
 
     225 Franklin Street (the "Property") is an office complex located in
Boston, Massachusetts encompassing approximately 930,000 square feet. Beacon
Properties, L.P. intends to acquire the entire fee interest in the Property.
 
RENTAL REVENUES
 
     Rental income is recognized on the straight-line method over the terms of
the related leases. The excess of recognized rentals over amounts due pursuant
to lease terms is recorded as accrued rent. The impact of the straight-line rent
adjustment increased revenues by approximately $2,845,000 for the year ended
December 31, 1996.
 
RISKS AND UNCERTAINTIES
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
2. BASIS OF ACCOUNTING:
 
     The accompanying statement of excess of revenues over specific operating
expenses is presented on the accrual basis. This statement has been prepared in
accordance with the applicable rules and regulations of the Securities and
Exchange Commission for real estate properties acquired or to be acquired.
Accordingly, the statement excludes certain historical income and expenses not
comparable to the operations of the property after acquisition, such as interest
income, management fees, depreciation, amortization, and interest expense.
 
3. DESCRIPTION OF LEASING ARRANGEMENTS:
 
     The commercial and office space is leased to tenants under leases with
terms that vary in length. Certain of the leases contain real estate tax
reimbursement clauses, operating expense reimbursement clauses and renewal
options. Minimum lease payments to be received during the next five years for
noncancelable operating leases in effect at December 31, 1996 are approximately
as follows:
 
<TABLE>
<CAPTION>
                        YEAR ENDING
                        DECEMBER 31,
                        ------------
<S>                                                           <C>
   1997.....................................................  $23,304,000
   1998.....................................................   25,256,000
   1999.....................................................   25,759,000
   2000.....................................................   24,350,000
   2001.....................................................   23,626,000
</TABLE>
 
     As of December 31, 1996, three tenants occupied approximately 68% of
leaseable square feet and represented 90% of total base revenues.
 
                                      F-127
<PAGE>   381
 
                                    ANNEX I
 
                          AGREEMENT AND PLAN OF MERGER
                      DATED SEPTEMBER 15, 1997, AS AMENDED
 
                                      A-I-1
<PAGE>   382
 
                                                                  EXECUTION COPY
 
                          AGREEMENT AND PLAN OF MERGER
                                     AMONG
                        EQUITY OFFICE PROPERTIES TRUST,
                       EOP OPERATING LIMITED PARTNERSHIP,
                         BEACON PROPERTIES CORPORATION
                                      AND
                            BEACON PROPERTIES, L.P.
 
                         DATED AS OF SEPTEMBER 15, 1997
<PAGE>   383
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                     PAGE
                                                                     ----
<S>    <C>                                                           <C>
ARTICLE 1  THE MERGERS.............................................    2
  1.1  The Merger..................................................    2
  1.2  The Partnership Merger......................................    2
  1.3  Closing.....................................................    2
  1.4  Effective Time..............................................    2
  1.5  Effect of Merger on Declaration of Trust and By-Laws........    3
  1.6  Effect of Merger on Agreement of Limited Partnership........    3
  1.7  Trustees....................................................    3
  1.8  Effect on Shares............................................    3
  1.9  Effect on Partnership Interests.............................    3
       Exchange Ratios.............................................
 1.10                                                                  3
       Registration Rights Agreement...............................
 1.11                                                                  4
       Unitholder Approval.........................................
 1.12                                                                  4
       No Appraisal Rights.........................................
 1.13                                                                  4
       Exchange of Certificates; Pre-Closing Dividends; Fractional
 1.14  Shares......................................................    4
ARTICLE 2  REPRESENTATIONS AND WARRANTIES OF BEACON................    6
  2.1  Organization, Standing and Power of Beacon..................    6
  2.2  Beacon Subsidiaries.........................................    7
  2.3  Capital Structure...........................................    7
  2.4  Other Interests.............................................    8
  2.5  Authority; Noncontravention; Consents.......................    9
  2.6  SEC Documents; Financial Statements; Undisclosed
       Liabilities.................................................   10
  2.7  Absence of Certain Changes or Events........................   10
  2.8  Litigation..................................................   11
  2.9  Properties..................................................   11
       Environmental Matters.......................................
 2.10                                                                 13
       Related Party Transactions..................................
 2.11                                                                 13
       Employee Benefits...........................................
 2.12                                                                 13
       Employee Policies...........................................
 2.13                                                                 15
       Taxes.......................................................
 2.14                                                                 15
       No Payments to Employees, Officers or Directors.............
 2.15                                                                 15
       Broker; Schedule of Fees and Expenses.......................
 2.16                                                                 16
       Compliance with Laws........................................
 2.17                                                                 16
       Contracts; Debt Instruments.................................
 2.18                                                                 16
       Opinion of Financial Advisor................................
 2.19                                                                 17
       State Takeover Statutes.....................................
 2.20                                                                 17
       Investment Company Act of 1940..............................
 2.21                                                                 17
       Definition of Knowledge of Beacon...........................
 2.22                                                                 17
ARTICLE 3  REPRESENTATIONS AND WARRANTIES OF EOP...................   18
  3.1  Organization, Standing and Power of EOP.....................   18
  3.2  EOP Subsidiaries............................................   18
  3.3  Capital Structure...........................................   18
  3.4  Other Interests.............................................   19
  3.5  Authority; Noncontravention; Consents.......................   20
  3.6  SEC Documents; Financial Statements; Undisclosed
       Liabilities.................................................   21
  3.7  Absence of Certain Changes or Events........................   21
  3.8  Litigation..................................................   21
  3.9  Properties..................................................   22
       Environmental Matters.......................................
 3.10                                                                 23
       Taxes.......................................................
 3.11                                                                 23
</TABLE>
 
                                        i
<PAGE>   384
<TABLE>
<CAPTION>
                                                                     PAGE
                                                                     ----
<S>    <C>                                                           <C>
       Brokers; Schedule of Fees and Expenses......................
 3.12                                                                 24
       Compliance with Laws........................................
 3.13                                                                 24
       Contracts; Debt Instruments.................................
 3.14                                                                 24
       Opinion of Financial Advisor................................
 3.15                                                                 24
       State Takeover Statutes.....................................
 3.16                                                                 24
       Investment Company Act of 1940..............................
 3.17                                                                 24
       Definition of Knowledge of EOP..............................
 3.18                                                                 24
       EOP Not an Interested Stockholder...........................
 3.19                                                                 24
ARTICLE 4  COVENANTS...............................................   24
  4.1  Conduct of Beacon's and Beacon Partnership's Business
       Pending Merger..............................................   24
  4.2  Conduct of EOP's and EOP Partnership's Business Pending
       Merger......................................................   26
  4.3  No Solicitation.............................................   28
  4.4  Affiliates..................................................   29
  4.5  Other Actions...............................................   29
ARTICLE 5  ADDITIONAL COVENANTS....................................   29
  5.1  Preparation of the Registration Statement and the Proxy
       Statement; Beacon Shareholders Meeting, Beacon Unitholders
       Consent Solicitation and EOP Shareholders Meeting...........   29
  5.2  Access to Information: Confidentiality......................   32
  5.3  Reasonable Best Efforts; Notification.......................   32
  5.4  Tax Treatment...............................................   33
  5.5  Public Announcements........................................   33
  5.6  Listing.....................................................   33
  5.7  Transfer and Gains Taxes....................................   33
  5.8  Benefit Plans and Other Employee Arrangements...............   33
  5.9  Indemnification.............................................   34
       Declaration of Dividends and Distributions..................
 5.10                                                                 36
       Transfer of Management Company Shares.......................
 5.11                                                                 36
       Notices.....................................................
 5.12                                                                 36
       Resignations................................................
 5.13                                                                 36
       Third Party Management Agreements...........................
 5.14                                                                 36
       Existing Restrictions on Resale of Certain Beacon
 5.15  Properties..................................................   36
       Agreement to Hold Certain Properties and Maintain Certain
 5.16  Indebtedness................................................   36
       RWLP Corp...................................................
 5.17                                                                 37
ARTICLE 6  CONDITIONS..............................................   37
  6.1  Conditions to Each Party's Obligation to Effect the
       Merger......................................................   37
  6.2  Conditions to Obligations of EOP and EOP Partnership........   37
  6.3  Conditions to Obligations of Beacon and Beacon
       Partnership.................................................   38
ARTICLE 7  TERMINATION, AMENDMENT AND WAIVER.......................   39
  7.1  Termination.................................................   39
  7.2  Certain Fees and Expenses...................................   40
  7.3  Effect of Termination.......................................   42
  7.4  Amendment...................................................   42
  7.5  Extension; Waiver...........................................   42
ARTICLE 8  GENERAL PROVISIONS......................................   42
  8.1  Nonsurvival of Representations and Warranties...............   42
  8.2  Notices.....................................................   42
  8.3  Interpretation..............................................   43
</TABLE>
 
                                       ii
<PAGE>   385
<TABLE>
<CAPTION>
                                                                     PAGE
                                                                     ----
<S>    <C>                                                           <C>
  8.4  Counterparts................................................   43
  8.5  Entire Agreement; No Third-Party Beneficiaries..............   43
  8.6  Governing Law...............................................   44
  8.7  Assignment..................................................   44
  8.8  Enforcement.................................................   44
  8.9  Severability................................................   44
       EOP Extension Option........................................
 8.10                                                                 44
       Exculpation.................................................
 8.11                                                                 44
</TABLE>
 
                                    EXHIBITS
 
EXHIBIT "A" -- ARTICLES OF MERGER
 
EXHIBIT "B" -- CERTIFICATE OF MERGER
 
                                       iii
<PAGE>   386
 
                             INDEX OF DEFINED TERMS
 
<TABLE>
<S>                                                           <C>
AICPA Statement.............................................  5.1(b)
Acquisition Proposal........................................  4.3(a)
Action......................................................  8.10
Affiliates..................................................  4.4
Agreement...................................................  Preamble
Articles of Merger..........................................  B
Average Closing Price.......................................  7.1(j)
Base Amount.................................................  7.2
Beacon......................................................  Preamble
Beacon Common Share.........................................  1.10(a)
Beacon Disclosure Letter....................................  Art. 2
Beacon Financial Statement Date.............................  2.7
Beacon Material Adverse Change..............................  2.7
Beacon Material Adverse Effect..............................  2.1
Beacon OP Unit..............................................  1.10(c)
Beacon Other Interests......................................  2.4
Beacon Partner Approvals....................................  1.12
Beacon Partnership..........................................  Preamble
Beacon Partnership Agreement................................  1.10(c)
Beacon Preferred Share......................................  1.10(b)
Beacon Preferred Unit.......................................  1.10(d)
Beacon Properties...........................................  2.9(a)
Beacon Rent Roll............................................  2.9(e)
Beacon SEC Documents........................................  2.6
Beacon Shareholder Approvals................................  2.5(a)
Beacon Shareholders Meeting.................................  5.1(e)
Beacon Space Lease..........................................  2.9(e)
Beacon Stock Options........................................  2.3(b)
Beacon Subsidiaries.........................................  2.2(a)
Beacon Voting Agreement.....................................  J
BeaMet......................................................  2.14(b)
Break-Up Fee................................................  7.2
Break-Up Fee Tax Opinion....................................  7.2
Break-Up Expenses...........................................  7.2
Certificate of Merger.......................................  D
Certificates................................................  1.14(c)
Closing.....................................................  1.3
Closing Date................................................  1.3
Code........................................................  E
Commitment..................................................  4.1(i)
Construction Company........................................  I
Construction Company Stock Purchase Agreement...............  I
Controlled Group Member.....................................  2.12
Department..................................................  1.4
Design Company..............................................  I
Design Company Stock Purchase Agreement.....................  I
DRULPA......................................................  1.2
Effective Time..............................................  1.4
Employee Plan...............................................  2.12
Encumbrances................................................  2.9(a)
</TABLE>
 
                                       iv
<PAGE>   387
EOP.........................................................  Preamble
EOP Bylaws..................................................  1.5
EOP Common Share............................................  1.10(a)
EOP Declaration of Trust....................................  1.5
EOP Disclosure Letter.......................................  Art. 3
EOP Financial Statement Date................................  3.7
EOP Management Corp.........................................  I
EOP Material Adverse Change.................................  3.7
EOP Material Adverse Effect.................................  3.1
EOP Options.................................................  3.3(b)
EOP OP Unit.................................................  1.10(c)
EOP Partner Approvals.......................................  1.12
EOP Partnership.............................................  Preamble
EOP Partnership Agreement...................................  1.6
EOP Preferred Share.........................................  1.10(b)
EOP Preferred Unit..........................................  1.10(d)
EOP Properties..............................................  3.9(a)
EOP Rent Roll...............................................  3.9(g)
EOP SEC Documents...........................................  3.6
EOP Shareholder Approvals...................................  3.5(a)
EOP Shareholders Meeting....................................  5.1(c)
EOP Space Lease.............................................  3.9(g)
EOP Subsidiaries............................................  3.1
EOP Voting Agreement........................................  K
ERISA.......................................................  2.12
Exchange Act................................................  2.6
Exchange Agent..............................................  1.14(a)
Exchange Fund...............................................  1.14(b)
Exchange Ratio..............................................  1.10(a)
Fair Market Value...........................................  1.14(g)
Final Company Dividend......................................  1.14(d)
Form S-4....................................................  5.1(a)
GAAP........................................................  2.6
Governmental Entity.........................................  2.5(c)
Hazardous Materials.........................................  2.10
Indebtedness................................................  2.18(b)
Indemnified Parties.........................................  5.9(a)
Indemnifying Parties........................................  5.9(a)
Interested Stockholder......................................  3.19
Knowledge of EOP............................................  3.18
Knowledge of Beacon.........................................  2.22
Laws........................................................  2.5(c)
Liens.......................................................  2.2(b)
Management Company..........................................  I
Management Company Stock Purchase Agreement.................  I
Merger......................................................  A
Mergers.....................................................  C
Merger Consideration........................................  1.10(b)
MGCL........................................................  1.1
NYSE........................................................  1.14(g)
Outside Property Management Agreements......................  2.18(f)
Partner Approvals...........................................  1.12
Partnership Merger..........................................  C
 
                                        v
<PAGE>   388
Payor.......................................................  7.2
Pension Plan................................................  2.12
Person......................................................  2.2(a)
Preferred Exchange Ratio....................................  1.10(b)
Preferred Unit Exchange Ratio...............................  1.10(d)
Pricing Period..............................................  7.1(j)
Prohibited Transaction......................................  2.12(c)
Property Restrictions.......................................  2.9(a)
Proxy Statement.............................................  5.1(a)
Qualifying Income...........................................  7.2
Recipient...................................................  7.2
Registration Rights Agreement...............................  1.11
REIT........................................................  2.14(b)
REIT Requirements...........................................  7.2
SEC.........................................................  2.5(c)
Secretary...................................................  1.4
Shareholder Approvals.......................................  3.5(a)
Stock Purchase Agreements...................................  I
Subsidiary..................................................  2.2(a)
Superior Acquisition Proposal...............................  4.3(d)
Surviving Partnership.......................................  1.2
Surviving Trust.............................................  1.1
Takeover Statute............................................  2.20
Taxes.......................................................  2.14(a)
Tax Protection Agreement....................................  2.18(j)
Third Party Provisions......................................  8.5
Title 8.....................................................  1.1
Transfer and Gains Taxes....................................  5.7
Unit Exchange Ratio.........................................  1.10(c)
Welfare Plan................................................  2.12
1940 Act....................................................  2.21
 
                                       vi
<PAGE>   389
 
                          AGREEMENT AND PLAN OF MERGER
 
     THIS AGREEMENT AND PLAN OF MERGER (this "Agreement") dated as of September
15, 1997 by and among EQUITY OFFICE PROPERTIES TRUST, a Maryland real estate
investment trust ("EOP"), EOP OPERATING LIMITED PARTNERSHIP, a Delaware limited
partnership ("EOP Partnership"), BEACON PROPERTIES CORPORATION, a Maryland
corporation ("Beacon"), and BEACON PROPERTIES, L.P., a Delaware limited
partnership ("Beacon Partnership").
 
                                   RECITALS:
 
     A. The Board of Trustees of EOP and the Board of Directors of Beacon deem
it advisable and in the best interests of their respective shareholders, upon
the terms and subject to the conditions contained herein, that Beacon shall
merge with and into EOP (the "Merger").
 
     B. Upon the terms and subject to the conditions set forth herein, EOP and
Beacon shall execute Articles of Merger (the "Articles of Merger") in
substantially the form attached hereto as Exhibit A and shall file such Articles
of Merger in accordance with Maryland law to effectuate the Merger.
 
     C. EOP, as the managing general partner of EOP Partnership, and Beacon, as
the sole general partner of Beacon Partnership, deem it advisable and in the
best interests of their respective limited partners, subject to the conditions
and other provisions contained herein, that Beacon Partnership shall merge with
and into EOP Partnership (or a limited liability company owned entirely,
directly and/or indirectly, by EOP Partnership, or a limited partnership owned
entirely, directly and/or indirectly, by EOP Partnership, as determined by EOP
and EOP Partnership), with the holders of partnership interests in Beacon
Partnership receiving in any event units of limited partnership interest in EOP
Partnership, as set forth herein (the "Partnership Merger" and, together with
the Merger, the "Mergers").
 
     D. Upon the terms and subject to the conditions set forth herein, EOP
Partnership and Beacon Partnership shall execute a Certificate of Merger (the
"Certificate of Merger") in substantially the form attached hereto as Exhibit B
and shall file such Certificate of Merger in accordance with Delaware law to
effectuate the Partnership Merger.
 
     E. For federal income tax purposes, it is intended that the Merger shall
qualify as a tax-free reorganization under Section 368 of the Internal Revenue
Code of 1986, as amended (the "Code"), and that this Agreement shall constitute
a plan of reorganization under Section 368 of the Code.
 
     F. For federal income taxes, it is intended that the Partnership Merger,
regardless of form, be treated as a contribution by Beacon Partnership of all of
its assets to EOP Partnership in exchange for partnership interests in EOP
Partnership, as provided for herein, under Section 721 of the Code, and a
distribution of such partnership interests by Beacon Partnership to its partners
under Section 731 of the Code.
 
     G. EOP and Beacon have each received a fairness opinion relating to the
transactions contemplated hereby as more fully described herein.
 
     H. EOP, EOP Partnership, Beacon and Beacon Partnership desire to make
certain representations, warranties and agreements in connection with the
Mergers.
 
     I. Concurrently with the execution of this Agreement and as an inducement
to EOP and EOP Partnership to enter into this Agreement, each of the holders of
voting capital stock of each of Beacon Property Management Corporation, a
Delaware corporation (the "Management Company"), Beacon Design Corporation, a
Massachusetts corporation (the "Design Company"), and Beacon Construction
Company, Inc., a Massachusetts corporation (the "Construction Company"), other
than Beacon Partnership, has entered into a Stock Purchase Agreement relating to
the voting capital stock of the respective companies (the "Management Company
Stock Purchase Agreement," the "Design Company Stock Purchase Agreement" and the
"Construction Company Stock Purchase Agreement," respectively and, collectively,
the "Stock Purchase Agreements"), providing for the sale of all of the
outstanding voting capital stock (other than any such voting capital stock held
by Beacon Partnership) of the Management Company, the Design Company
<PAGE>   390
 
and the Construction Company, respectively, to Equity Office Properties
Management Corp. ("EOP Management Corp.") or its assigns.
 
     J. As an inducement to EOP to enter into this Agreement, certain members of
the Leventhal and Sidman families and trusts and partnerships established for
the benefit of the members of the Leventhal and Sidman families have entered
into or will (within ten (10) business days following the date of this
Agreement) enter into a voting agreement (each, a "Beacon Voting Agreement")
pursuant to which such person or entity has agreed, among other things, to vote
his or its Beacon Common Shares (as defined in Section 1.10(a) of this
Agreement) and Beacon OP Units (as defined in Section 1.10(c) of this Agreement)
to approve this Agreement, the respective Mergers and any other matter which
requires his or its vote in connection with the transactions contemplated by
this Agreement.
 
     K. As an inducement to Beacon to enter into this Agreement, each of several
trusts established for the benefit of members of the family of Samuel Zell,
Zell/Merrill Lynch Real Estate Opportunity Partners Limited Partnership,
Zell/Merrill Lynch Real Estate Opportunity Partners Limited Partnership II,
Zell/Merrill Lynch Real Estate Opportunity Partners Limited Partnership III,
Zell/Merrill Lynch Real Estate Opportunity Partners Limited Partnership IV, ZML
Partners Limited Partnership, ZML Partners Limited Partnership II, ZML Partners
Limited Partnership III and ZML Partners Limited Partnership IV has entered into
or will (within ten (10) business days of the date of this Agreement) enter into
a voting agreement (each, an "EOP Voting Agreement") pursuant to which such
person or entity has agreed, among other things, to vote his or its EOP Common
Shares (as defined in Section 1.10(a) of this Agreement) and EOP OP Units (as
defined in Section 1.10(c) of this Agreement) to approve this Agreement, the
respective Mergers and any other matter which requires his or its vote in
connection with the transactions contemplated by this Agreement.
 
     NOW, THEREFORE, in consideration of the premises and the mutual
representations, warranties, covenants and agreements contained herein, the
parties hereto hereby agree as follows:
 
                                   ARTICLE 1
 
                                  THE MERGERS
 
     1.1 The Merger. Upon the terms and subject to the conditions set forth in
this Agreement, and in accordance with Title 8 of the Corporations and
Associations Article of the Annotated Code of Maryland, as amended ("Title 8"),
and the Maryland General Corporation Law ("MGCL"), Beacon shall be merged with
and into EOP, with EOP as the surviving real estate investment trust (the
"Surviving Trust").
 
     1.2 The Partnership Merger. Upon the terms and subject to the conditions of
this Agreement, and in accordance with Title 6, Chapter 17 of the Delaware Code
Annotated, as amended (the "DRULPA"), immediately following the consummation of
the Merger, Beacon Partnership shall be merged with and into EOP Partnership
(or, at EOP Partnership's option, a limited liability company owned entirely,
directly and/or indirectly, by EOP Partnership, or a limited partnership owned
entirely, directly and/or indirectly, by EOP Partnership, as determined by EOP
and EOP Partnership), with EOP Partnership (or such limited partnership or
limited liability company subsidiary) as the surviving limited partnership or
limited liability company (the "Surviving Partnership"), and with the holders of
partnership interests in Beacon Partnership receiving in any event units of
partnership interest in EOP Partnership, as set forth in Sections 1.9 and
1.10(c).
 
     1.3 Closing. The closing of the Mergers (the "Closing") will take place at
10:00 a.m., local time on the date to be specified by the parties, which
(subject to satisfaction or waiver of the conditions set forth in Article 6)
shall be no later than the third business day after satisfaction or waiver of
the conditions set forth in Section 6.1(a) (the "Closing Date"), at the offices
of Goodwin, Procter & Hoar LLP, Exchange Place, Boston, Massachusetts 02109,
unless another date or place is agreed to in writing by the parties.
 
     1.4 Effective Time. As soon as practicable following the satisfaction or
waiver of the conditions set forth in Article 6, EOP and Beacon shall execute
and file the Articles of Merger, executed in accordance with
 
                                        2
<PAGE>   391
 
Title 8 and the MGCL, with the State Department of Assessments and Taxation of
Maryland (the "Department"), and shall execute and file the Certificate of
Merger, executed in accordance with the DRULPA, with the Office of the Secretary
of State of the State of Delaware (the "Secretary") and shall make all other
filings and recordings required, with respect to the Merger, under Title 8 and
the MGCL or, with respect to the Partnership Merger, under the DRULPA. The
Mergers shall become effective (the "Effective Time") at such times as EOP and
Beacon shall agree should be specified in the Articles of Merger and the
Certificate of Merger (not to exceed thirty (30) days after the Articles of
Merger are accepted for record by the Department). Unless otherwise agreed, the
parties shall cause the Effective Time to occur on the Closing Date.
 
     1.5 Effect of Merger on Declaration of Trust and Bylaws. The Articles of
Amendment and Restatement of Declaration of Trust, as amended, of EOP (the "EOP
Declaration of Trust") and the Bylaws of EOP (the "EOP Bylaws"), as in effect
immediately prior to the Effective Time, shall continue in full force and effect
after the Merger until further amended in accordance with applicable Maryland
law.
 
     1.6 Effect of Merger on Agreement of Limited Partnership. The Agreement of
Limited Partnership, as amended, of EOP Partnership, as in effect immediately
prior to the Effective Time (the "EOP Partnership Agreement"), shall continue in
full force and effect after the Merger until further amended in accordance with
applicable Delaware law.
 
     1.7 Trustees. The trustees of the Surviving Trust shall consist of the
trustees of EOP immediately prior to the Effective Time, who shall continue to
serve for the balance of their unexpired terms or their earlier death,
resignation or removal, together with each of Alan M. Leventhal and Edwin
Sidman, who shall, on the third business day after the Effective Time, become a
trustee with a term expiring at the first annual meeting of shareholders of EOP,
and, in connection with such first annual meeting, EOP's Board of Trustees shall
cause these two members to be nominated for election to the Board of Trustees
with terms expiring in 1999 and 2001, respectively; provided, however, that if
notice with respect to the first annual meeting of shareholders of EOP is mailed
prior to the Effective Time, Alan M. Leventhal and Edwin Sidman shall instead,
on the first business day after the first annual meeting of shareholders of EOP,
become trustees with terms expiring at the annual meetings of shareholders of
EOP in 1999 and 2001, respectively. In connection with the second annual meeting
of shareholders of EOP, EOP's Board of Trustees shall cause Alan M. Leventhal to
be nominated for re-election as a trustee to the Board of Trustees with a term
expiring at the annual meeting of shareholders of EOP in 2002. Following their
election as trustees, such persons shall serve for their designated terms,
subject to their earlier death, resignation or removal. In addition, in the
event that EOP's current Chairman of the Board ceases to be Chairman of the
Board of EOP prior to the Effective Time, EOP's Board of Trustees shall
designate Alan M. Leventhal as Chairman of the Board for a term consisting of at
least twelve consecutive months (subject to his remaining a trustee throughout
such period of twelve months).
 
     1.8  Effect on Shares. The effect of the Merger on the shares of capital
stock of Beacon shall be as provided in the Articles of Merger. The Merger shall
not change the shares of beneficial interest of EOP outstanding immediately
prior to the Merger.
 
     1.9  Effect on Partnership Interests. The effect of the Partnership Merger
on the partnership interests of Beacon Partnership shall be as provided in the
Certificate of Merger. The Partnership Merger shall not change the partnership
interests of EOP Partnership outstanding immediately prior to the Merger.
 
     1.10  Exchange Ratios.
 
     (a) The exchange ratio to be set forth in the Articles of Merger (the
"Exchange Ratio") shall be 1.4063 of a common share of beneficial interest,
$0.01 par value per share, of EOP ("EOP Common Share") for each share of common
stock, $0.01 par value per share, of Beacon ("Beacon Common Share") outstanding
immediately prior to the Effective Time.
 
     (b) The exchange ratio to be set forth in the Articles of Merger (the
"Preferred Exchange Ratio") shall be one 8.98% Series A Cumulative Redeemable
preferred share of beneficial interest, liquidation preference $25.00 per share,
of EOP ("EOP Preferred Share" and, together with the EOP Common Shares, the
"Merger
 
                                        3
<PAGE>   392
 
Consideration") for each share of 8.98% Series A Cumulative Redeemable Preferred
Stock, liquidation preference $25.00 per share, of Beacon ("Beacon Preferred
Share") outstanding immediately prior to the Effective Time. The holders of the
EOP Preferred Shares issued in the Merger shall be entitled to the same rights
and privileges as the holders of the Beacon Preferred Shares outstanding on the
date hereof.
 
     (c) The exchange ratio to be set forth in the Certificate of Merger (the
"Unit Exchange Ratio") shall be 1.4063 of a Class A Unit (as defined in the EOP
Partnership Agreement) of EOP Partnership ("EOP OP Unit"), for each Partnership
Unit (as defined in the Amended and Restated Agreement of Limited Partnership of
Beacon Partnership (the "Beacon Partnership Agreement")) other than Series A
Preferred Units (as defined in the Beacon Partnership Agreement) ("Beacon OP
Unit") outstanding immediately prior to the Effective Time. The holders of the
EOP OP Units issued in the Partnership Merger shall be entitled to redeem such
EOP OP Units immediately following the consummation of the Partnership Merger
(and thereafter) pursuant to the terms of the EOP Partnership Agreement, and
shall be entitled to the same rights and privileges as the holders of EOP OP
Units outstanding on the date hereof.
 
     (d) The exchange ratio to be set forth in the Certificate of Merger (the
"Preferred Unit Exchange Ratio") shall be one 8.98% Series A Preferred Unit of
EOP Partnership ("EOP Preferred Unit") for each unit of 8.98% Series A Preferred
Unit of Beacon Partnership ("Beacon Preferred Unit") outstanding immediately
prior to the Effective Time. EOP, as the holder of the EOP Preferred Units
issued in the Partnership Merger, shall be entitled to the same rights and
privileges as Beacon, as the holder of the Beacon Preferred Units outstanding on
the date hereof.
 
     1.11  Registration Rights Agreement. At the Effective Time, EOP will assume
in writing and succeed to all rights and obligations of Beacon pursuant to the
Registration Rights Agreements listed on Schedule 2.5 to the Beacon Disclosure
Letter.
 
     1.12  Partner Approval. Beacon shall seek the requisite approval of the
partners of Beacon Partnership to the Partnership Merger to the extent required
by the Beacon Partnership Agreement and any other matters reasonably requested
by either party to effectuate the transactions contemplated by this Agreement
(collectively, the "Beacon Partner Approvals"). EOP shall seek the requisite
approval of the partners of EOP Partnership to the Partnership Merger to the
extent required by the EOP Partnership Agreement and any other matters
reasonably requested by either party to effectuate the transactions contemplated
by this Agreement (collectively, the "EOP Partner Approvals," and together with
the Beacon Partner Approvals, the "Partner Approvals").
 
     1.13  No Appraisal Rights. The holders of Beacon Common Shares, Beacon
Preferred Shares, Beacon OP Units, EOP Shares, and EOP OP Units are not entitled
under applicable law to appraisal rights as a result of the Mergers.
 
     1.14  Exchange of Certificates; Pre-Closing Dividends; Fractional Shares.
 
     (a) Exchange Agent. Prior to the Effective Time, EOP shall appoint the
exchange agent identified in Exhibit A, or another bank or trust company
reasonably acceptable to Beacon, to act as exchange agent (the "Exchange Agent")
for the exchange of the Merger Consideration upon surrender of certificates
representing issued and outstanding Beacon Common Shares or Beacon Preferred
Shares, as applicable.
 
     (b) EOP to Provide Merger Consideration. EOP shall provide to the Exchange
Agent on or before the Effective Time, for the benefit of the holders of Beacon
Common Shares and Beacon Preferred Shares, EOP Common Shares and EOP Preferred
Shares (the "Exchange Fund") issuable in exchange for the issued and outstanding
Beacon Common Shares and Beacon Preferred Shares pursuant to Section 1.10.
Beacon shall provide to the Exchange Agent on or before the Effective Time, for
the benefit of the holders of Beacon Common Shares, cash payable in respect of
any dividends required pursuant to Section 1.14(d)(i) or (ii).
 
     (c) Exchange Procedure. As soon as reasonably practicable after the
Effective Time, the Exchange Agent shall mail to each holder of record of a
certificate or certificates which immediately prior to the Effective Time
represented outstanding Beacon Common Shares and Beacon Preferred Shares (the
"Certificates") whose shares were converted into the right to receive the Merger
Consideration pursuant to
 
                                        4
<PAGE>   393
 
Section 1.10 (i) a letter of transmittal (which shall specify that delivery
shall be effected, and risk of loss and title to the Certificates shall pass,
only upon delivery of the Certificates to the Exchange Agent and shall be in a
form and have such other provisions as EOP may reasonably specify) and (ii)
instructions for use in effecting the surrender of the Certificates in exchange
for the Merger Consideration. Upon surrender of a Certificate for cancellation
to the Exchange Agent or to such other agent or agents as may be appointed by
EOP, together with such letter of transmittal, duly executed, and such other
documents as may reasonably be required by the Exchange Agent, the holder of
such Certificate shall be entitled to receive in exchange therefor the Merger
Consideration into which the Beacon Common Shares or Beacon Preferred Shares, as
applicable, theretofore represented by such Certificate shall have been
converted pursuant to Section 1.10, as well as any dividends or other
distributions to which such holder is entitled pursuant to Section 1.14(d), and
the Certificate so surrendered shall forthwith be canceled. In the event of a
transfer of ownership of Beacon Common Shares or Beacon Preferred Shares which
is not registered in the transfer records of Beacon, payment may be made to a
person other than the person in whose name the Certificate so surrendered is
registered if such Certificate shall be properly endorsed or otherwise be in
proper form for transfer and the person requesting such payment either shall pay
any transfer or other taxes required by reason of such payment being made to a
person other than the registered holder of such Certificate or establish to the
satisfaction of EOP that such tax or taxes have been paid or are not applicable.
Until surrendered as contemplated by this Section 1.14, each Certificate shall
be deemed at any time after the Effective Time to represent only the right to
receive upon such surrender the Merger Consideration, without interest, into
which the Beacon Common Shares or Beacon Preferred Shares, as applicable,
theretofore represented by such Certificate shall have been converted pursuant
to Section 1.10, and any dividends or other distributions to which such holder
is entitled pursuant to Section 1.14(d). No interest will be paid or will accrue
on the Merger Consideration upon the surrender of any Certificate or on any cash
payable pursuant to Section 1.14(d) or Section 1.14(g).
 
     (d) Record Dates for Final Dividends; Distributions with Respect to
Unexchanged Shares.
 
          (i) To the extent necessary to satisfy the requirements of Section
     857(a)(1) of the Code for the taxable year of Beacon ending at the
     Effective Time (and avoid the payment of tax with respect to undistributed
     income), Beacon shall declare a dividend (the "Final Company Dividend") to
     holders of Beacon Common Shares, the record date for which shall be the
     close of business on the last business day prior to the Effective Time, in
     an amount equal to the minimum dividend sufficient to permit Beacon to
     satisfy such requirements. If Beacon determines it necessary to declare the
     Final Company Dividend, it shall notify EOP at least ten (10) days prior to
     the date for the Beacon Shareholders Meeting (as defined in Section 5.1),
     and EOP shall declare a dividend per share to holders of EOP Common Shares,
     the record date for which shall be the close of business on the last
     business day prior to the Effective Time, in an amount per EOP Common Share
     equal to the quotient obtained by dividing (x) the Final Company Dividend
     per Beacon Common Share paid by Beacon by (y) the Exchange Ratio. The
     dividends payable hereunder to holders of Beacon Common Shares shall be
     paid upon presentation of the certificates of Beacon Common Shares for
     exchange in accordance with this Section 1.14.
 
          (ii) No dividends or other distributions with respect to EOP Common
     Shares with a record date after the Effective Time shall be paid to the
     holder of any unsurrendered Certificate with respect to the shares of EOP
     Common Shares represented thereby, and no cash payment in lieu of
     fractional shares shall be paid to any such holder pursuant to Section
     1.14(g), in each case until the surrender of such Certificate in accordance
     with this Section 1.14. Subject to the effect of applicable escheat laws,
     following surrender of any such Certificate there shall be paid to the
     holder of such Certificate, without interest, (i) at the time of such
     surrender, the amount of any cash payable in lieu of any fractional EOP
     Common Shares to which such holder is entitled pursuant to Section 1.14(g)
     and (ii) if such Certificate is exchangeable for one or more whole EOP
     Common Shares, (x) at the time of such surrender the amount of dividends or
     other distributions with a record date after the Effective Time theretofore
     paid with respect to such whole EOP Common Shares and (y) at the
     appropriate payment date, the amount of dividends or other distributions
     with a record date after the Effective Time but prior to such surrender
 
                                        5
<PAGE>   394
 
     and with a payment date subsequent to such surrender payable with respect
     to such whole EOP Common Shares.
 
     (e) No Further Ownership Rights in Beacon Common Shares and Beacon
Preferred Shares. All Merger Consideration paid upon the surrender of
Certificates in accordance with the terms of this Section 1.14 (and any cash
paid pursuant to Section 1.14(g)) shall be deemed to have been paid in full
satisfaction of all rights pertaining to the Beacon Common Shares or Beacon
Preferred Shares, as applicable, theretofore represented by such Certificates;
provided, however, that Beacon shall transfer to the Exchange Agent cash
sufficient to pay any dividends or make any other distributions with a record
date prior to the Effective Time which may have been declared or made by Beacon
on such Beacon Common Shares or Beacon Preferred Shares, as applicable, in
accordance with the terms of this Agreement or prior to the date of this
Agreement and which remain unpaid at the Effective Time and have not been paid
prior to such surrender, and there shall be no further registration of transfers
on the stock transfer books of Beacon of the Beacon Common Shares and Beacon
Preferred Shares which were outstanding immediately prior to the Effective Time.
If, after the Effective Time, Certificates are presented to EOP for any reason,
they shall be canceled and exchanged as provided in this Section 1.14.
 
     (f) No Liability. None of Beacon, EOP or the Exchange Agent shall be liable
to any person in respect of any Merger Consideration or dividends delivered to a
public official pursuant to any applicable abandoned property, escheat or
similar law. Any portion of the Exchange Fund delivered to the Exchange Agent
pursuant to this Agreement that remains unclaimed for twelve (12) months after
the Effective Time shall be redelivered by the Exchange Agent to EOP, upon
demand, and any holders of Certificates who have not theretofore complied with
Section 1.14(c) shall thereafter look only to EOP for delivery of the Merger
Consideration and any unpaid dividends, subject to applicable escheat and other
similar laws.
 
     (g) No Fractional Shares
 
          (i) No certificates or scrip representing fractional EOP Common Shares
     shall be issued upon the surrender for exchange of Certificates, and such
     fractional share interests will not entitle the owner thereof to vote, to
     receive dividends or to any other rights of a shareholder of EOP.
 
          (ii) No fractional EOP Common Shares shall be issued pursuant to this
     Agreement. In lieu of the issuance of any fractional EOP Common Shares
     pursuant to this Agreement, each holder of Beacon Common Shares upon
     surrender of a Certificate for exchange shall be paid an amount in cash
     (without interest), rounded to the nearest cent, determined by multiplying
     (i) the average closing price of one EOP Common Share on the New York Stock
     Exchange (the "NYSE") on the five trading days immediately preceding the
     Closing Date (the "Fair Market Value") by (ii) the fractional amount of the
     EOP Common Shares which such holder would otherwise be entitled to receive
     under this Section 1.14.
 
     (h) Except for the provisions relating to the Exchange Agent, certificates
and the exchange procedure (which shall not be applicable), all other provisions
of this Section 1.14 shall apply to Beacon Partnership, EOP Partnership and the
Beacon OP Units with respect to the Partnership Merger.
 
                                   ARTICLE 2
 
                    REPRESENTATIONS AND WARRANTIES OF BEACON
 
     Except as set forth in the letter of even date herewith signed by the
President and Chief Executive Officer or the Executive Vice President and Chief
Operating Officer of Beacon and delivered to EOP prior to the execution hereof
(the "Beacon Disclosure Letter"), Beacon and Beacon Partnership represent and
warrant to EOP and EOP Partnership as follows:
 
     2.1 Organization, Standing and Power of Beacon. Beacon is a corporation
duly organized, validly existing and in good standing under the laws of
Maryland. Beacon has all requisite corporate power and authority to own,
operate, lease and encumber its properties and carry on its business as now
being conducted. Beacon is duly qualified or licensed to do business as a
foreign corporation and is in good standing in each jurisdiction in which the
nature of its business or the ownership or leasing of its properties makes such
 
                                        6
<PAGE>   395
 
qualification or licensing necessary, other than in such jurisdictions where the
failure to be so qualified or licensed, individually or in the aggregate, would
not have a material adverse effect on the business, properties, assets,
financial condition or results of operations of Beacon and the Beacon
Subsidiaries (as defined below), taken as a whole (an "Beacon Material Adverse
Effect"). Beacon has delivered to EOP complete and correct copies of Beacon's
Articles of Incorporation and Amended and Restated Bylaws, in each case, as
amended or supplemented to the date of this Agreement.
 
     2.2 Beacon Subsidiaries.
 
     (a) Schedule 2.2 to the Beacon Disclosure Letter sets forth (i) each
Subsidiary (as defined below) of Beacon (the "Beacon Subsidiaries"), (ii) the
ownership interest therein of Beacon, (iii) if not wholly owned by Beacon, the
identity and ownership interest of each of the other owners of such Beacon
Subsidiary, (iv) each office property and other commercial property owned by
such Subsidiary, and (v) if not wholly owned by such Subsidiary, the identity
and ownership interest of each of the other owners of such property. As used in
this Agreement, "Subsidiary" of any Person (as defined below) means any
corporation, partnership, limited liability company, joint venture, trust or
other legal entity of which such Person owns (either directly or through or
together with another Subsidiary of such Person) either (i) a general partner,
managing member or other similar interest, or (ii)(A) 10% or more of the voting
power of the voting capital stock or other equity interests, or (B) 10% or more
of the outstanding voting capital stock or other voting equity interests of such
corporation, partnership, limited liability company, joint venture or other
legal entity. As used herein, "Person" means an individual, corporation,
partnership, limited liability company, joint venture, association, trust,
unincorporated organization or other entity. Schedule 2.4 sets forth a true and
complete list of the equity securities owned by Beacon, directly or indirectly,
in any corporation, partnership, limited liability company, joint venture or
other legal entity, excluding Beacon Subsidiaries.
 
     (b) Except as set forth in Schedule 2.2 to the Beacon Disclosure Letter,
(i) all of the outstanding shares of capital stock of each Beacon Subsidiary
that is a corporation have been duly authorized, validly issued and are (A)
fully paid and nonassessable and not subject to preemptive rights, (B) owned by
Beacon or by another Beacon Subsidiary and (C) owned free and clear of all
pledges, claims, liens, charges, encumbrances and security interests of any kind
or nature whatsoever (collectively, "Liens") and (ii) all equity interests in
each Beacon Subsidiary that is a partnership, joint venture, limited liability
company or trust which are owned by Beacon, by another Beacon Subsidiary or by
Beacon and another Beacon Subsidiary are owned free and clear of all Liens. Each
Beacon Subsidiary that is a corporation is duly incorporated, validly existing
and in good standing under the laws of its jurisdiction of incorporation and has
the requisite corporate power and authority to own, operate, lease and encumber
its properties and carry on its business as now being conducted, and each Beacon
Subsidiary that is a partnership, limited liability company or trust is duly
organized, validly existing and in good standing under the laws of its
jurisdiction of organization and has the requisite power and authority to own,
operate, lease and encumber its properties and carry on its business as now
being conducted. Each Beacon Subsidiary is duly qualified or licensed to do
business and is in good standing in each jurisdiction in which the nature of its
business or the ownership or leasing of its properties makes such qualification
or licensing necessary, other than in such jurisdictions where the failure to be
so qualified or licensed, individually or in the aggregate, would not have a
Beacon Material Adverse Effect. Complete and correct copies of the Articles of
Incorporation, Bylaws, organization documents and partnership, joint venture and
operating agreements of each Beacon Subsidiary, as amended to the date of this
Agreement, have been previously delivered or made available to EOP. No effective
amendment has been made to the Beacon Partnership Agreement since August 4,
1997.
 
     2.3 Capital Structure.
 
     (a) The authorized shares of capital stock of Beacon consist of 25,000,000
shares of preferred stock, $0.01 par value per share, 8,000,000 of which are
issued and outstanding on the date of this Agreement, 50,000,000 shares of
excess stock, $0.01 par value per share, none of which are issued or outstanding
on the date of this Agreement, and 100,000,000 Beacon Common Shares, 55,599,850
of which were issued and outstanding as of September 12, 1997.
 
                                        7
<PAGE>   396
 
     (b) Set forth in Schedule 2.3(b) to the Beacon Disclosure Letter is a true
and complete list of the following: (i) each qualified or nonqualified option to
purchase shares of Beacon's capital stock granted under Beacon's Amended and
Restated 1994 Stock Option and Incentive Plan and Beacon's 1996 Stock Option
Plan or any other formal or informal arrangement (collectively, the "Beacon
Stock Options"); and (ii) all other warrants or other rights to acquire shares
of Beacon's capital stock, all limited stock appreciation rights, phantom stock,
dividend equivalents, performance units and performance shares which are
outstanding on the date of this Agreement. Schedule 2.3(b) to the Beacon
Disclosure Letter sets forth for each Beacon Stock Option the name of the
grantee, the date of the grant, status of the option as qualified or
nonqualified under Section 422 of the Code, the number and type of shares of
Beacon's capital stock subject to such option, the number and type of shares
subject to options that are currently exercisable, the exercise price per share,
and the number and type of such shares subject to share appreciation rights. On
the date of this Agreement, except as set forth in this Section 2.3 or in
Schedule 2.3(b) to the Beacon Disclosure Letter, no shares of Beacon's capital
stock were outstanding or reserved for issuance.
 
     (c) All outstanding shares of Beacon's capital stock are duly authorized,
validly issued, fully paid and nonassessable and not subject to preemptive
rights. There are no bonds, debentures, notes or other indebtedness of Beacon
having the right to vote (or convertible into, or exchangeable for, securities
having the right to vote) on any matters on which shareholders of Beacon may
vote.
 
     (d) Except (i) as set forth in this Section 2.3 or in Schedule 2.3(d) to
the Beacon Disclosure Letter and (ii) Beacon OP Units, which may be redeemed for
cash or, at the option of Beacon, Beacon Common Shares, as of the date of this
Agreement, there are no outstanding securities, options, warrants, calls,
rights, commitments, agreements, arrangements or undertakings of any kind to
which Beacon or any Beacon Subsidiary is a party or by which such entity is
bound, obligating Beacon or any Beacon Subsidiary to issue, deliver or sell, or
cause to be issued, delivered or sold, additional shares of capital stock,
voting securities or other ownership interests of Beacon or any Beacon
Subsidiary or obligating Beacon or any Beacon Subsidiary to issue, grant, extend
or enter into any such security, option, warrant, call, right, commitment,
agreement, arrangement or undertaking (other than to Beacon or a Beacon
Subsidiary).
 
     (e) As of the date of this Agreement, 70,943,301 Beacon OP Units (including
8,000,000 8.98% Series A Preferred Units) are validly issued and outstanding,
fully paid and nonassessable and not subject to preemptive rights, of which
63,599,850 are owned by Beacon. Schedule 2.3(e) to the Beacon Disclosure
Schedule sets forth the name of each holder of Beacon OP Units and the number of
Beacon OP Units owned by each such holder as of the date of this Agreement. The
Beacon OP Units are subject to no restrictions except as set forth in the Beacon
Partnership Agreement or in certain Lock-up Agreements executed by certain
holders of Beacon OP Units upon the issuance of such Beacon OP Units. Except as
provided in the Beacon Partnership Agreement, Beacon Partnership has not issued
or granted and is not a party to any outstanding commitments of any kind
relating to, or any presently effective agreements or understandings with
respect to, the issuance or sale of interests in Beacon Partnership, whether
issued or unissued, or securities convertible or exchangeable into interests in
Beacon Partnership.
 
     (f) All dividends on Beacon Common Shares and Beacon Preferred Shares, and
all distributions on Beacon OP Units (including Series A Preferred Units), which
have been declared prior to the date of this Agreement have been paid in full,
except that certain dividends payable on Beacon Preferred Shares (along with the
corresponding distributions payable on Series A Preferred Units) which were
declared on September 2, 1997 and are payable on September 15, 1997 have not yet
been paid.
 
     (g) Set forth on Schedule 2.3(g) to the Beacon Disclosure Letter is a list
of each Registration Rights Agreement pursuant to which Beacon is obligated to
register any securities.
 
     2.4 Other Interests. Except for interests in the Beacon Subsidiaries and
certain other entities as set forth in Schedule 2.4 to the Beacon Disclosure
Letter (the "Beacon Other Interests"), neither Beacon nor any Beacon
Subsidiaries owns directly or indirectly any interest or investment (whether
equity or debt) in any corporation, partnership, joint venture, business, trust
or other entity (other than investments in short-term investment securities).
With respect to the Beacon Other Interests, Beacon or Beacon Partnership is a
partner or stockholder in good standing, and owns such interests free and clear
of all Liens. Neither Beacon nor any
 
                                        8
<PAGE>   397
 
Beacon Subsidiary is in material breach of any provision of any agreement,
document or contract which is of a material nature governing its rights in or to
the Beacon Other Interests, all of which agreements, documents and contracts are
(a) set forth in the Beacon Disclosure Letter, (b) unmodified except as
described therein and (c) in full force and effect. To the Knowledge of Beacon,
the other parties to any such agreement, document or contract which is of a
material nature are not in material breach of any of their respective
obligations under such agreements, documents or contracts.
 
     2.5 Authority; Noncontravention; Consents.
 
     (a) Beacon has the requisite corporate power and authority to enter into
this Agreement and, subject to the requisite shareholder approval of the Merger
(the "Beacon Shareholder Approvals"), to consummate the transactions
contemplated by this Agreement to which Beacon is a party. The execution and
delivery of this Agreement by Beacon and the consummation by Beacon of the
transactions contemplated by this Agreement to which Beacon is a party have been
duly authorized by all necessary action on the part of Beacon, except for and
subject to the Beacon Shareholder Approvals and the Beacon Partner Approvals.
This Agreement has been duly executed and delivered by Beacon and constitutes a
valid and binding obligation of Beacon, enforceable against Beacon in accordance
with and subject to its terms, subject to applicable bankruptcy, insolvency,
moratorium or other similar laws relating to creditors' rights and general
principles of equity.
 
     (b) Beacon Partnership has the requisite partnership power and authority to
enter into this Agreement and, subject to the requisite Beacon Partner
Approvals, to consummate the transactions contemplated by this Agreement to
which Beacon Partnership is a party. The execution and delivery of this
Agreement by Beacon Partnership and the consummation by Beacon Partnership of
the transactions contemplated by this Agreement to which Beacon Partnership is a
party have been duly authorized by all necessary action on the part of Beacon
Partnership, except for and subject to the Beacon Shareholder Approvals and the
Beacon Partner Approvals. This Agreement has been duly executed and delivered by
Beacon Partnership and constitutes a valid and binding obligation of Beacon
Partnership, enforceable against Beacon Partnership in accordance with and
subject to its terms, subject to applicable bankruptcy, insolvency, moratorium
or other similar laws relating to creditors' rights and general principles of
equity.
 
     (c) Except as set forth in Schedule 2.5(c)(1) to the Beacon Disclosure
Letter, the execution and delivery of this Agreement by Beacon do not, and the
consummation of the transactions contemplated by this Agreement to which Beacon
is a party and compliance by Beacon with the provisions of this Agreement will
not, conflict with, or result in any violation of, or default (with or without
notice or lapse of time, or both) under, or give rise to a right of termination,
cancellation or acceleration of any material obligation or to material loss of a
benefit under, or result in the creation of any Lien upon any of the properties
or assets of Beacon or any Beacon Subsidiary under, (i) the Articles of
Incorporation or the Amended and Restated Bylaws of Beacon or the comparable
charter or organizational documents or partnership, operating, or similar
agreement (as the case may be) of any Beacon Subsidiary, each as amended or
supplemented, (ii) any loan or credit agreement, note, bond, mortgage,
indenture, reciprocal easement agreement, lease or other agreement, instrument,
permit, concession, franchise or license applicable to Beacon or any Beacon
Subsidiary or their respective properties or assets or (iii) subject to the
governmental filings and other matters referred to in the following sentence,
any judgment, order, decree, statute, law, ordinance, rule or regulation
(collectively, "Laws") applicable to Beacon or any Beacon Subsidiary, or their
respective properties or assets, other than, in the case of clause (ii) or
(iii), any such conflicts, violations, defaults, rights, loss or Liens that
individually or in the aggregate would not (x) have a Beacon Material Adverse
Effect or (y) prevent the consummation of the transactions contemplated by this
Agreement. No consent, approval, order or authorization of, or registration,
declaration or filing with, any federal, state or local government or any court,
administrative or regulatory agency or commission or other governmental
authority or agency, domestic or foreign (a "Governmental Entity"), is required
by or with respect to Beacon or any Beacon Subsidiary in connection with the
execution and delivery of this Agreement by Beacon or the consummation by Beacon
of the transactions contemplated by this Agreement, except for (i) the filing
with the Securities and Exchange Commission (the "SEC") of the Proxy Statement
(as defined in Section 5.1), (ii) the acceptance for record of the Articles of
Merger by the Department, (iii) the filing of the Certificate of Merger with the
Secretary and (iv) such other consents, approvals, orders, authorizations,
registrations, declarations and filings (A) as
 
                                        9
<PAGE>   398
 
are set forth in Schedule 2.5(c)(2) to the Beacon Disclosure Letter, (B) as may
be required under (x) laws requiring transfer, recordation or gains tax filings,
(y) federal, state or local environmental laws or (z) the "blue sky" laws of
various states, to the extent applicable or (C) which, if not obtained or made,
would not prevent or delay in any material respect the consummation of any of
the transactions contemplated by this Agreement or otherwise prevent Beacon from
performing its obligations under this Agreement in any material respect or have,
individually or in the aggregate, a Beacon Material Adverse Effect.
 
     2.6 SEC Documents; Financial Statements; Undisclosed Liabilities. Beacon
and Beacon Partnership have filed all required reports, schedules, forms,
statements and other documents with the SEC since May 26, 1994 and April 9, 1997
respectively, through the date hereof (the "Beacon SEC Documents"). Schedule
2.6(a) to the Beacon Disclosure Letter contains a complete list of all Beacon
SEC Documents filed by Beacon or Beacon Partnership with the SEC since January
1, 1997 and on or prior to the date of this Agreement. All of the Beacon SEC
Documents (other than preliminary material), as of their respective filing
dates, complied in all material respects with all applicable requirements of the
Securities Act and the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), and, in each case, the rules and regulations promulgated
thereunder applicable to such Beacon SEC Documents. None of the Beacon SEC
Documents at the time of filing contained any untrue statement of a material
fact or omitted to state any material fact required to be stated therein or
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading, except to the extent such statements
have been modified or superseded by later Beacon SEC Documents filed and
publicly available prior to the date of this Agreement. The consolidated
financial statements of Beacon included in the Beacon SEC Documents or of Beacon
Partnership included in the Beacon SEC Documents complied as to form in all
material respects with applicable accounting requirements and the published
rules and regulations of the SEC with respect thereto, have been prepared in
accordance with generally accepted accounting principles ("GAAP") (except, in
the case of unaudited statements, as permitted by the applicable rules and
regulations of the SEC) applied on a consistent basis during the periods
involved (except as may be indicated in the notes thereto) and fairly presented,
in accordance with the applicable requirements of GAAP and the applicable rules
and regulations of the SEC, the consolidated financial position of Beacon and
its Subsidiaries or Beacon Partnership and its Subsidiaries, as the case may be,
in each case taken as a whole, as of the dates thereof and the consolidated
results of operations and cash flows for the periods then ended (subject, in the
case of unaudited statements, to normal year-end audit adjustments). Except as
set forth in Schedule 2.6(b) to the Beacon Disclosure Letter, Beacon has no
Subsidiaries which are not consolidated for accounting purposes. Except for
liabilities and obligations set forth in the Beacon SEC Documents or in Schedule
2.6(c) to the Beacon Disclosure Letter, neither Beacon nor any of the Beacon
Subsidiaries has any liabilities or obligations of any nature (whether accrued,
absolute, contingent or otherwise) required by GAAP to be set forth on a
consolidated balance sheet of Beacon or in the notes thereto and which,
individually or in the aggregate, would have a Beacon Material Adverse Effect.
 
     2.7 Absence of Certain Changes or Events. Except as disclosed in the Beacon
SEC Documents or in Schedule 2.7 to the Beacon Disclosure Letter, since the date
of the most recent audited financial statements included in Beacon SEC Documents
(the "Beacon Financial Statement Date"), Beacon and its Subsidiaries have
conducted their business only in the ordinary course (taking into account prior
practices, including the acquisition of properties and issuance of securities)
and there has not been (a) any material adverse change in the business,
financial condition or results of operations of Beacon and its Subsidiaries
taken as a whole (a "Beacon Material Adverse Change"), nor has there been any
occurrence or circumstance that with the passage of time would reasonably be
expected to result in a Beacon Material Adverse Change, (b) except for regular
quarterly distributions not in excess of $.56 per Beacon Preferred Share or
Beacon Preferred Unit or $.50 per Beacon Common Share or Beacon OP Unit (other
than Beacon Preferred Units), respectively (or, with respect to the period
commencing on the date hereof and ending on the Closing Date, distributions as
necessary to maintain REIT status), in each case with customary record and
payment dates, any authorization, declaration, setting aside or payment of any
dividend or other distribution (whether in cash, stock or property) with respect
to the Beacon Common Shares, Beacon Preferred Shares or Beacon OP Units, (c) any
split, combination or reclassification of the Beacon Common Shares or the Beacon
OP Units or any issuance or the authorization of any issuance of any other
securities in respect of, in lieu of or in substitution for, or
 
                                       10
<PAGE>   399
 
giving the right to acquire by exchange or exercise, shares of stock of Beacon
or partnership interests in Beacon Partnership or any issuance of an ownership
interest in, any Beacon Subsidiary, (d) any damage, destruction or loss, whether
or not covered by insurance, that has or would have a Beacon Material Adverse
Effect, (e) any change in accounting methods, principles or practices by Beacon
or any Beacon Subsidiary materially affecting its assets, liabilities or
business, except insofar as may have been disclosed in Beacon SEC Documents or
required by a change in GAAP, or (f) any amendment of any employment,
consulting, severance, retention or any other agreement between Beacon and any
officer or director of Beacon.
 
     2.8 Litigation. Except as disclosed in the Beacon SEC Documents or in
Schedule 2.8 to the Beacon Disclosure Letter, and other than personal injury and
other routine tort litigation arising from the ordinary course of operations of
Beacon and its Subsidiaries (a) which are covered by adequate insurance or (b)
for which all material costs and liabilities arising therefrom are reimbursable
pursuant to common area maintenance or similar agreements, there is no suit,
action or proceeding pending (in which service of process has been received by
an employee of Beacon or a Beacon Subsidiary) or, to the Knowledge of Beacon (as
hereinafter defined), threatened in writing against or affecting Beacon or any
Beacon Subsidiary that, individually or in the aggregate, could reasonably be
expected to (i) have a Beacon Material Adverse Effect or (ii) prevent the
consummation of any of the transactions contemplated by this Agreement, nor is
there any judgment, decree, injunction, rule or order of any court or
Governmental Entity or arbitrator outstanding against Beacon or any of its
Subsidiaries having, or which, insofar as reasonably can be foreseen, in the
future would have, any such effect. Notwithstanding the foregoing, (y) Schedule
2.8 to the Beacon Disclosure Letter sets forth each and every material uninsured
claim, equal employment opportunity claim and claim relating to sexual
harassment and/or discrimination pending or, to the Knowledge of Beacon,
threatened as of the date hereof, in each case with a brief summary of such
claim or threatened claim and (z) no claim has been made under any directors'
and officers' liability insurance policy maintained at any time by Beacon or any
of the Beacon Subsidiaries; provided, however, that if Beacon or Beacon
Partnership has prepared Schedule 2.8 to the Beacon Disclosure Letter in good
faith, EOP hereby covenants not to exercise any right that it may have to
terminate this Agreement pursuant to Section 7.1(b), based solely on any breach
of representation of Beacon and Beacon Partnership contained in this sentence;
provided further, however, that nothing contained in this Section 2.8 shall
affect EOP's right to terminate this Agreement pursuant to Section 7.1(b) with
respect to any matter described in clause (y) or (z) above that occurs or arises
after the date hereof.
 
     2.9 Properties.
 
     (a) Except as provided in Schedule 2.2 or Schedule 2.9(a) to the Beacon
Disclosure Letter, Beacon or the Beacon Subsidiary set forth on Schedule 2.2 to
the Beacon Disclosure Letter owns fee simple title to each of the real
properties identified in Schedule 2.2 to the Beacon Disclosure Letter (the
"Beacon Properties"), which are all of the real estate properties owned by them,
in each case (except as provided below) free and clear of liens, mortgages or
deeds of trust, claims against title, charges which are liens, security
interests or other encumbrances on title ("Encumbrances"). Except as set forth
in Schedule 2.2 to the Beacon Disclosure Letter, no other Person has any
ownership interest in any of the Beacon Properties, and any such ownership
interest so scheduled does not materially detract from the value of the Beacon
Subsidiary's interest in, or materially interfere with the present use of, any
of the Beacon Properties subject thereto or affected thereby. Except as set
forth in Schedule 2.9(a) to the Beacon Disclosure Letter, none of the Beacon
Properties is subject to any restriction on the sale or other disposition
thereof or on the financing or release of financing thereon. The Beacon
Properties are not subject to any rights of way, written agreements, laws,
ordinances and regulations affecting building use or occupancy, or reservations
of an interest in title (collectively, "Property Restrictions") or Encumbrances,
except for (i) Property Restrictions and Encumbrances set forth in the Beacon
Disclosure Letter, (ii) Property Restrictions imposed or promulgated by law or
any governmental body or authority with respect to real property, including
zoning regulations, which do not materially adversely affect the current use of
any Beacon Property, (iii) Property Restrictions and Encumbrances disclosed on
existing title reports or existing surveys or subsequently granted by Beacon or
the Beacon Subsidiary, which Property Restrictions and Encumbrances, in any
event, do not materially detract from the value of, or materially interfere with
the present use of, any of the Beacon Properties subject thereto or affected
thereby and (iv) liens for real estate taxes not yet due and payable,
mechanics', carriers', workmen's, repairmen's liens
 
                                       11
<PAGE>   400
 
and other Encumbrances and Property Restrictions, if any, which, individually or
in the aggregate, do not materially detract from the value of or materially
interfere with the present use of any of the Beacon Property subject thereto or
affected thereby. Schedule 2.9(a) to the Beacon Disclosure Letter lists each of
the Beacon Properties which are under development as of the date of this
Agreement and describes the status of such development as of the date hereof.
 
     (b) Except as provided in Schedule 2.2 or Schedule 2.9(b) to the Beacon
Disclosure Letter, valid policies of title insurance have been issued insuring
the applicable Beacon Subsidiary's fee simple title or leasehold estate, as the
case may be, to the Beacon Properties owned by it in amounts at least equal to
the purchase price therefor paid by such Beacon Subsidiary, subject only to the
matters disclosed above and in the Beacon Disclosure Letter. Such policies are,
at the date hereof, in full force and effect. No claim has been made against any
such policy.
 
     (c) Except as provided in Schedule 2.9(c) to the Beacon Disclosure Letter,
Beacon has no Knowledge (i) that, any certificate, permit or license from any
governmental authority having jurisdiction over any of the Beacon Properties or
any agreement, easement or other right which is necessary to permit the lawful
use and operation of the buildings and improvements on any of the Beacon
Properties or which is necessary to permit the lawful use and operation of all
driveways, roads and other means of egress and ingress to and from any of the
Beacon Properties has not been obtained and is not in full force and effect, or
of any pending threat of modification or cancellation of any of same which would
have a material adverse effect on such Beacon Property, (ii) of any written
notice of any violation of any federal, state or municipal law, ordinance,
order, regulation or requirement materially and adversely affecting any of the
Beacon Properties issued by any governmental authority, (iii) of any structural
defects relating to any Beacon Property which would have a material adverse
effect on such Beacon Property, (iv) of any Beacon Property whose building
systems are not in working order so as to have a material adverse effect on such
Beacon Property, or (v) of any physical damage to any Beacon Property which
would have a material adverse effect on such Beacon Property for which there is
no insurance in effect covering the cost of the restoration.
 
     (d) Neither Beacon nor any Beacon Subsidiary has received any written or
published notice to the effect that (i) any condemnation or rezoning proceedings
are pending or threatened with respect to any of the Beacon Properties or (ii)
any zoning, building or similar law, code, ordinance, order or regulation is or
will be violated by the continued maintenance, operation or use of any buildings
or other improvements on any of the Beacon Properties or by the continued
maintenance, operation or use of the parking areas. Except as set forth in
Schedule 2.9(d) to the Beacon Disclosure Letter, all work required to be
performed, payments required to be made and actions required to be taken other
than those which would not have a material adverse effect on any of Beacon or
the Beacon Subsidiaries prior to the date hereof pursuant to any agreement
entered into with a governmental body or authority in connection with a site
approval, zoning reclassification or other similar action relating to any Beacon
Properties (e.g., Local Improvement District, Road Improvement District,
Environmental Mitigation) have been performed, paid or taken, as the case may
be, and Beacon has no Knowledge of any planned or proposed work, payments or
actions that may be required after the date hereof pursuant to such agreements,
except as set forth in development or operating budgets for such Beacon
Properties delivered to EOP and EOP Partnership prior to the date hereof.
 
     (e) The rent roll previously provided by Beacon to EOP (the "Beacon Rent
Roll") lists each Beacon Space Lease (as defined below) in effect as of April 1,
1997. "Beacon Space Lease" means each lease or other right of occupancy
affecting or relating to a property in which Beacon Partnership (or an entity in
which it directly or indirectly has an interest) is the landlord, either
pursuant to the terms of the lease agreement or as successor to any prior
landlord, but excluding any ground lease. Beacon has made available to EOP true,
correct and complete copies of all Beacon Space Leases, including all
amendments, modifications, supplements, renewals, extensions and guarantees
related thereto, as of the date hereof. Except for discrepancies that, either
individually or in the aggregate, would not reasonably be expected to have a
Beacon Material Adverse Effect, all information set forth in the Beacon Rent
Roll is true, correct and complete as of the date thereof. Except as set forth
in a delinquency report made available to EOP, neither Beacon or any Beacon
Subsidiary, on the one hand, nor, to the knowledge of Beacon or Beacon
Partnership, any other party, on the
 
                                       12
<PAGE>   401
 
other hand, is in monetary default under any Beacon Space Lease, except for such
defaults that would not reasonably be expected to have a Beacon Material Adverse
Effect.
 
     2.10  Environmental Matters. Except as disclosed in the Beacon SEC
Documents, (a) none of Beacon, any of the Beacon Subsidiaries or, to Beacon's
Knowledge, any other Person has caused or permitted the unlawful presence of any
hazardous substances, hazardous materials, toxic substances or waste materials
(collectively, "Hazardous Materials") on or under any of the Beacon Properties
and none of Beacon nor any of the Beacon Subsidiaries has any knowledge of the
presence of any Hazardous Materials on or under any of the Beacon Properties or
(b) none of Beacon, any of the Beacon Subsidiaries, or to Beacon's Knowledge,
any other Person, has caused or permitted any unlawful spills, releases,
discharges or disposal of Hazardous Materials to have occurred or be presently
occurring on or from the Beacon Properties as a result of any construction on or
operation and use of such properties and none of Beacon nor any of the Beacon
Subsidiaries has any knowledge of any spills, releases, discharges or disposal
of Hazardous Materials to have occurred or be presently occurring on, under or
from the Beacon Properties as a result of any construction on or operation and
use of such properties, in each of the foregoing cases, which presence or
occurrence would, individually or in the aggregate, have a Beacon Material
Adverse Effect; and in connection with the construction on or operation and use
of the Beacon Properties, Beacon and the Beacon Subsidiaries have not failed to
comply in any material respect with all applicable local, state and federal
environmental laws, regulations, ordinances and administrative and judicial
orders relating to the generation, recycling, reuse, sale, storage, handling,
transport and disposal of any Hazardous Materials, except to the extent such
failure to comply, individually or in the aggregate, would not have a Beacon
Material Adverse Effect. Beacon has previously delivered or made available to
EOP complete copies of all final versions of environmental investigations and
testing or analysis made by or on behalf of Beacon or any of the Beacon
Subsidiaries that are in the possession of any of them with respect to the
environmental condition of the Beacon Properties.
 
     2.11  Related Party Transactions. Set forth in Schedule 2.11 to the Beacon
Disclosure Letter is a list of all material arrangements, agreements and
contracts entered into by Beacon or any of the Beacon Subsidiaries with (a) any
investment banker or financial advisor, (b) any person who is an officer,
director or Affiliate (as defined below) of Beacon or any of its Subsidiaries,
any relative of any of the foregoing or any entity of which any of the foregoing
is an Affiliate or (c) any person who acquired Beacon Common Shares or Beacon OP
Units in a private placement. Such documents, copies of all of which have
previously been delivered or made available to EOP, are listed in Schedule 2.11
to the Beacon Disclosure Letter. As used in this Agreement, the term "Affiliate"
shall have the same meaning as such term is defined in Rule 405 promulgated
under the Securities Act.
 
     2.12  Employee Benefits. As used herein, the term "Employee Plan" includes
any pension, retirement, savings, disability, medical, dental, health, life,
death benefit, group insurance, profit sharing, deferred compensation, stock
option, bonus, incentive, vacation pay, tuition reimbursement, severance pay, or
other employee benefit plan, trust, agreement, contract, agreement, policy or
commitment (including, without limitation, any pension plan, as defined in
Section 3(2) of the Employee Retirement Income Security Act of 1974, as amended,
and the rules and regulations promulgated thereunder ("ERISA") ("Pension Plan"),
and any welfare plan as defined in Section 3(1) of ERISA ("Welfare Plan")),
whether any of the foregoing is funded, insured or self-funded, written or oral,
(i) sponsored or maintained by Beacon or its Subsidiaries (each a "Controlled
Group Member") and covering any Controlled Group Member's active or former
employees (or their beneficiaries), (ii) to which any Controlled Group Member is
a party or by which any Controlled Group Member (or any of the rights,
properties or assets thereof) is bound or (iii) with respect to which any
current Controlled Group Member may otherwise have any material liability
(whether or not such Controlled Group Member still maintains such Employee
Plan). Each Employee Plan is listed on Schedule 2.12 to the Beacon Disclosure
Letter. With respect to the Employee Plans:
 
          (a) Except as disclosed in Schedule 2.12(a) to the Beacon Disclosure
     Letter, no Controlled Group Member has any continuing liability under any
     Welfare Plan which provides for continuing benefits or coverage for any
     participant or any beneficiary of a participant after such participant's
     termination of employment, except as may be required by Section 4980B of
     the Code or Section 601 (et seq.) of
 
                                       13
<PAGE>   402
 
     ERISA, or under any applicable state law, and at the expense of the
     participant or the beneficiary of the participant.
 
          (b) Each Employee Plan complies in all material respects with the
     applicable requirements of ERISA and any other applicable law governing
     such Employee Plan, and, to the best Knowledge of Beacon, each Employee
     Plan has at all times been properly administered in all material respects
     in accordance with all such requirements of law, and in accordance with its
     terms and the terms of any applicable collective bargaining agreement to
     the extent consistent with all such requirements of law. Each Pension Plan
     which is intended to be qualified is qualified under Section 401(a) of the
     Code, has received a favorable determination letter from the IRS stating
     that such Plan meets the requirements of Section 401(a) of the Code and
     that the trust associated with such Plan is tax-exempt under Section 501(a)
     of the Code and, to the best Knowledge of Beacon, no event has occurred
     which would jeopardize the qualified status of any such plan or the tax
     exempt status of any such trust under Sections 401(a) and Section 501(a) of
     the Code, respectively. No lawsuits, claims (other than routine claims for
     benefits) or complaints to, or by, any person or governmental entity have
     been filed, are pending, to the best Knowledge of Beacon, threatened with
     respect to any Employee Plan and, to the best Knowledge of Beacon, there is
     no fact or contemplated event which would be expected to give rise to any
     such lawsuit, claim (other than routine claims for benefits) or complaint
     with respect to any Pension Plan. Without limiting the foregoing, the
     following are true with respect to each Employee Plan:
 
             (i) all Controlled Group Members have complied in all material
        respects with the reporting and disclosure requirements of ERISA, the
        Code, or both, with respect to each Employee Plan and no Controlled
        Group Member has incurred any material liability in connection with such
        reporting or disclosure;
 
             (ii) all contributions and payments with respect to Employee Plans
        that are required to be made by a Controlled Group Member with respect
        to periods ending on or before the Closing Date (including periods from
        the first day of the current plan or policy year to the Closing Date)
        have been, or will be, made or accrued before the Closing Date in
        accordance with the appropriate plan document, actuarial report,
        collective bargaining agreements or insurance contracts or arrangements
        or as otherwise required by ERISA or the Code; and
 
             (iii) with respect to each such Employee Plan, to the extent
        applicable, Beacon has delivered to or has made available to EOP true
        and complete copies of (A) plan documents, or any and all other
        documents that establish the existence of the plan, trust, arrangement,
        contract, policy or commitment and all amendments thereto, (B) the most
        recent determination letter, if any, received from the IRS, (C) the
        three most recent Form 5500 Annual Reports (and all schedules and
        reports relating thereto) and actuarial reports and (D) all related
        trust agreements, insurance contract or other funding agreements that
        implement each such Employee Plan.
 
          (c) With respect to each Employee Plan, to the best Knowledge of
     Beacon, there has not occurred, and no person or entity is contractually
     bound to enter into, any "prohibited transaction" within the meaning of
     Section 4975(c) of the Code or Section 406 of ERISA, which transaction is
     not exempt under Section 4975(d) of the Code or Section 408 of ERISA and
     which could subject Beacon or any Controlled Group Member to material
     liability.
 
          (d) Except as disclosed in Schedule 2.12(d) to the Beacon Disclosure
     Letter, no Controlled Group Member has maintained or been obligated to
     contribute to any Employee Plan subject to Code Section 412 or Title IV of
     ERISA. No Employee Plan subject to Code Section 412 or Title IV of ERISA
     has been terminated.
 
          (e) With respect to each pension plan maintained by any Controlled
     Group Member, such Plans provide the Plan Sponsor the authority to amend or
     terminate the Plan at any time, subject to applicable requirements of ERISA
     and the Code.
 
                                       14
<PAGE>   403
 
     2.13 Employee Policies. No employee handbook of Beacon or any of the Beacon
Subsidiaries is currently in effect. Schedule 2.13 to the Beacon Disclosure
Letter fairly and accurately summarizes all material employee policies, vacation
policies and payroll policies.
 
     2.14 Taxes.
 
     (a) Each of Beacon and the Beacon Subsidiaries (A) has filed all Tax
returns and reports required to be filed by it (after giving effect to any
filing extension properly granted by a Governmental Entity having authority to
do so) and all such returns and reports are accurate and complete in all
material respects, and (B) has paid (or Beacon has paid on its behalf) all Taxes
(as defined below) shown on such returns and reports as required to be paid by
it, except those where the failure to file such tax returns and reports or pay
such Taxes would not have a Beacon Material Adverse Effect. The most recent
audited financial statements contained in the Beacon SEC Documents reflect an
adequate reserve for all material Taxes payable by Beacon and the Beacon
Subsidiaries for all taxable periods and portions thereof through the date of
such financial statements. Since the Beacon Financial Statement Date, Beacon has
incurred no liability for taxes under Sections 857(b), 860(c) or 4981 of the
Code, including without limitation any tax arising from a prohibited transaction
described in Section 857(b)(6) of the Code, and neither Beacon nor any Beacon
Subsidiary has incurred any material liability for taxes other than in the
ordinary course of business. No event has occurred, and no condition or
circumstance exists, which presents a material risk that any material Tax
described in the preceding sentence will be imposed upon Beacon. To the
Knowledge of Beacon, no deficiencies for any Taxes have been proposed, asserted
or assessed against Beacon or any of the Beacon Subsidiaries, and no requests
for waivers of the time to assess any such Taxes are pending. As used in this
Agreement, "Taxes" shall include all federal, state, local and foreign income,
property, sales, franchise, employment, excise and other taxes, tariffs or
governmental charges of any nature whatsoever, together with penalties, interest
or additions to Tax with respect thereto.
 
     (b) Beacon and BeaMetFed, Inc. ("BeaMet") (i) for all taxable years
commencing with 1994 (or, in the case of BeaMet, 1995) through December 31, 1996
has been subject to taxation as a real estate investment trust (a "REIT") within
the meaning of Section 856 of the Code and has satisfied all requirements to
qualify as a REIT for such years, (ii) has operated since December 31, 1996 to
the date of this representation, and intends to continue to operate, in such a
manner as to qualify as a REIT for the taxable year ending December 31, 1997 and
for the taxable year of Beacon ending on the Closing Date (or, in the case of
BeaMet, on December 31, 1998), and (iii) has not taken or omitted to take any
action which would reasonably be expected to result in a challenge to its status
as a REIT and, to Beacon's Knowledge, no such challenge is pending or
threatened. Each Beacon Subsidiary which is a partnership, joint venture or
limited liability company (i) has been since its formation and continues to be
treated for federal income tax purposes as a partnership and not as a
corporation or an association taxable as a corporation and (ii) has not since
the later of its formation or the acquisition by Beacon of a direct or indirect
interest therein, owned any assets (including, without limitation, securities)
that would cause Beacon to violate Section 856(c)(5) of the Code. No Beacon
Subsidiary (other than BeaMet, the Management Company, the Design Company and
the Construction Company) is a corporation (or an entity that would, under
applicable federal income tax principles, be classified as an association
taxable as a corporation). Beacon Partnership is not a publicly traded
partnership within the meaning of Section 7704 of the Code. Neither Beacon nor
any Beacon Subsidiary holds any asset (x) the disposition of which would be
subject to rules similar to Section 1374 of the Code as a result of a notice
under IRS Notice 88-19 or (y) which is subject to a consent filed pursuant to
Section 341(f) of the Code and the regulations thereunder.
 
     2.15 No Payments to Employees, Officers or Directors. Schedule 2.15 to the
Beacon Disclosure Letter contains a true and complete list of all arrangements,
agreements or plans pursuant to which cash and non-cash payments which will
become payable (and the maximum aggregate amount which may be payable
thereunder) to each employee, officer or director of Beacon or any Beacon
Subsidiary as a result of the Merger or a termination of service subsequent to
the consummation of the Merger. Except as described in Schedule 2.15 to the
Beacon Disclosure Letter, or as otherwise provided for in this Agreement, there
is no employment or severance contract, or other agreement requiring payments,
cancellation of indebtedness or other obligation to be made on a change of
control or otherwise as a result of the consummation of any of the
 
                                       15
<PAGE>   404
 
transactions contemplated by this Agreement or as a result of a termination of
service subsequent to the consummation of any of the transactions contemplated
by this Agreement, with respect to any employee, officer or director of Beacon
or any Beacon Subsidiary.
 
     2.16 Broker; Schedule of Fees and Expenses. No broker, investment banker,
financial advisor or other person, other than Morgan Stanley & Co.,
Incorporated, the fees and expenses of which are described in the engagement
letter dated September 12, 1997, between Morgan Stanley & Co., Incorporated and
Beacon, a true, correct and complete copy of which has previously been given to
EOP, is entitled to any broker's, finder's, financial advisor's or other similar
fee or commission in connection with the transactions contemplated hereby based
upon arrangements made by or on behalf of Beacon or any Beacon Subsidiary.
 
     2.17 Compliance with Laws. Neither Beacon nor any of the Beacon
Subsidiaries has violated or failed to comply with any statute, law, ordinance,
regulation, rule, judgment, decree or order of any Governmental Entity
applicable to its business, properties or operations, except to the extent that
such violation or failure would not have a Beacon Material Adverse Effect.
 
     2.18 Contracts; Debt Instruments.
 
     (a) Neither Beacon nor any Beacon Subsidiary has received a written notice
that Beacon or any Beacon Subsidiary is in violation of or in default under (nor
to the Knowledge of Beacon does there exist any condition which upon the passage
of time or the giving of notice or both would cause such a violation of or
default under) any material loan or credit agreement, note, bond, mortgage,
indenture, lease, permit, concession, franchise, license or any other material
contract, agreement, arrangement or understanding, to which it is a party or by
which it or any of its properties or assets is bound, nor to the Knowledge of
Beacon does such a violation or default exist, except to the extent that such
violation or default, individually or in the aggregate, would not have a Beacon
Material Adverse Effect.
 
     (b) Except for any of the following expressly identified in Beacon SEC
Documents, Schedule 2.18(b) to the Beacon Disclosure Letter sets forth a list of
each material loan or credit agreement, note, bond, mortgage, indenture and any
other agreement or instrument pursuant to which any Indebtedness (as defined
below) of Beacon or any of the Beacon Subsidiaries, other than Indebtedness
payable to Beacon or a Beacon Subsidiary is outstanding or may be incurred. For
purposes of this Section 2.18, "Indebtedness" shall mean (i) indebtedness for
borrowed money, whether secured or unsecured, (ii) obligations under conditional
sale or other title retention agreements relating to property purchased by such
person, (iii) capitalized lease obligations, (iv) obligations under interest
rate cap, swap, collar or similar transaction or currency hedging transactions
(valued at the termination value thereof) and (v) guarantees of any such
indebtedness of any other person.
 
     (c) To the extent not set forth in response to the requirements of Section
2.18(b), Schedule 2.18(c) to the Beacon Disclosure Letter sets forth each
interest rate cap, interest rate collar, interest rate swap, currency hedging
transaction, and any other agreement relating to a similar transaction to which
Beacon or any Beacon Subsidiary is a party or an obligor with respect thereto.
 
     (d) Except as set forth in Schedule 2.18(d) of the Beacon Disclosure
Letter, neither Beacon nor any of the Beacon Subsidiaries is a party to any
agreement which would restrict any of them from prepaying any of their
Indebtedness without penalty or premium at any time or which requires any of
them to maintain any amount of Indebtedness with respect to any of the Beacon
Properties.
 
     (e) Neither Beacon nor any Beacon Subsidiary is a party to any agreement
relating to the management of any Beacon Property by any Person other than the
Management Company, Beacon Management L.P. and Beacon Properties South Station
Management Company, L.P.
 
     (f) Neither Beacon nor any of the Beacon Subsidiaries is a party to any
agreement pursuant to which Beacon or any Beacon Subsidiary manages or provides
services with respect to any real properties other than Beacon Properties,
except for the agreements described in Schedule 2.18(f) to the Beacon Disclosure
Letter (the "Outside Property Management Agreements").
 
                                       16
<PAGE>   405
 
     (g) Beacon has delivered to EOP prior to the date of this Agreement a true
and complete capital budget relating to budgeted construction. Schedule 2.18(g)
to the Beacon Disclosure Letter lists all material agreements entered into by
Beacon or any of the Beacon Subsidiaries relating to the development or
construction of, or additions or expansions to, any Beacon Real Properties (or
any properties with respect to which Beacon has executed as of the date of this
Agreement a purchase agreement or other similar agreement) which are currently
in effect and under which Beacon or any of the Beacon Subsidiaries currently
has, or expects to incur, an obligation in excess of $250,000. True, correct and
complete copies of such agreements have previously been delivered or made
available to EOP.
 
     (h) Schedule 2.18(h) to the Beacon Disclosure Letter lists all agreements
entered into by Beacon or any Beacon Subsidiary providing for the sale of, or
option to sell, any Beacon Properties or the purchase of, or option to purchase,
by Beacon or any Beacon Subsidiary, on the one hand, or the other party thereto,
on the other hand, any real estate which are currently in effect.
 
     (i) Except as set forth in Schedule 2.18(i) to the Beacon Disclosure
Letter, neither Beacon nor any Beacon Subsidiary has any material continuing
contractual liability (A) for indemnification or otherwise under any agreement
relating to the sale of real estate previously owned, whether directly or
indirectly, by Beacon or any Beacon Subsidiary or (B) to pay any additional
purchase price for any of the Beacon Properties.
 
     (j) Except as set forth in Schedule 2.18(j) to the Beacon Disclosure
Letter, neither Beacon nor any Beacon Subsidiary has entered into or is subject,
directly or indirectly, to any "Tax Protection Agreements." As used herein, a
Tax Protection Agreement is an agreement, oral or written, (A) that has as one
of its purposes to permit a person or entity to take the position that such
person or entity could defer federal taxable income that otherwise might have
been recognized upon a transfer of property to the Beacon Partnership or any
other Beacon Subsidiary that is treated as a partnership for federal income tax
purposes, and (B) that (i) prohibits or restricts in any manner the disposition
of any assets of Beacon or any Beacon Subsidiary, (ii) requires that Beacon or
any Beacon Subsidiary maintain, or put in place, or replace, indebtedness,
whether or not secured by one or more of the Beacon Properties, or (iii)
requires that Beacon or any Beacon Subsidiary offer to any person or entity at
any time the opportunity to guarantee or otherwise assume, directly or
indirectly, the risk of loss for federal income tax purposes for indebtedness or
other liabilities of Beacon or any Beacon Subsidiary.
 
     2.19 Opinion of Financial Advisor. Beacon has received the oral opinion of
Morgan Stanley & Co., Incorporated or an affiliate thereof, satisfactory to
Beacon, to the effect that the proposed consideration to be received by the
holders of Beacon Common Shares pursuant to the Merger is fair to such holders
from a financial point of view.
 
     2.20 State Takeover Statutes. Beacon has taken all action necessary to
exempt the transactions contemplated by this Agreement between EOP and Beacon
and its Affiliates from the operation of any "fair price," "moratorium,"
"control share acquisition" or any other anti-takeover statute or similar
statute enacted under the state or federal laws of the United States or similar
statute or regulation (a "Takeover Statute").
 
     2.21 Investment Company Act of 1940. Neither Beacon nor any of the Beacon
Subsidiaries is, or at the Effective Time will be, required to be registered
under the Investment Company Act of 1940, as amended (the "1940 Act").
 
     2.22 Definition of Knowledge of Beacon. As used in this Agreement, the
phrase "Knowledge of Beacon" (or words of similar import) means the knowledge of
those individuals identified in Schedule 2.22 to the Beacon Disclosure Letter.
 
                                       17
<PAGE>   406
 
                                   ARTICLE 3
 
                     REPRESENTATIONS AND WARRANTIES OF EOP
 
     Except as set forth in the letter of even date herewith signed by the
President or an Executive Vice President of EOP and delivered to Beacon prior to
the execution hereof (the "EOP Disclosure Letter"), EOP and EOP Partnership
represent and warrant to Beacon and Beacon Partnership as follows:
 
     3.1 Organization, Standing and Power of EOP. EOP is a real estate
investment trust duly organized, validly existing and in good standing under the
laws of Maryland and has all requisite power and authority to own, operate,
lease and encumber its properties and carry on its business as now being
conducted. EOP is duly qualified or licensed to do business as a foreign trust
and is in good standing in each jurisdiction in which the nature of its business
or the ownership or leasing of its properties makes such qualification or
licensing necessary, other than in such jurisdictions where the failure to be so
qualified or licensed, individually or in the aggregate, would not have a
material adverse effect on the business, properties, assets, financial condition
or results of operations of EOP and the Subsidiaries of EOP (collectively, "EOP
Subsidiaries"), taken as a whole (an "EOP Material Adverse Effect"). EOP has
delivered to Beacon complete and correct copies of the EOP Declaration of Trust
and the EOP Bylaws, as amended or supplemented to the date of this Agreement.
 
     3.2 EOP Subsidiaries.
 
     (a) Schedule 3.2(a) to the EOP Disclosure Letter sets forth (i) each EOP
Subsidiary, (ii) the ownership interest therein of EOP, (iii) if not wholly
owned by EOP, the identity and ownership interest of each of the other owners of
such EOP Subsidiary, (iv) each office property and other commercial property
owned by such Subsidiary, and (v) if not wholly owned by such Subsidiary, the
identity and ownership interest of each of the other owners of such property.
 
     (b) Except as set forth in Schedule 3.2(b) to the EOP Disclosure Letter,
(i) all the outstanding shares of capital stock of each EOP Subsidiary that is a
corporation have been duly authorized, validly issued and are (A) fully paid and
nonassessable and not subject to preemptive rights, (B) owned by EOP or by
another EOP Subsidiary and (C) owned free and clear of all Liens and (ii) all
equity interests in each EOP Subsidiary that is a partnership, joint venture,
limited liability company or trust which are owned by EOP, by another EOP
Subsidiary or by EOP and another EOP Subsidiary are owned free and clear of all
Liens. Each EOP Subsidiary that is a corporation is duly incorporated, validly
existing and in good standing under the laws of its jurisdiction of
incorporation and has the requisite corporate power and authority to own,
operate, lease and encumber its properties and carry on its business as now
being conducted, and each EOP Subsidiary that is a partnership, limited
liability company or trust is duly organized, validly existing and in good
standing under the laws of its jurisdiction of organization and has the
requisite power and authority to own, operate, lease and encumber its properties
and carry on its business as now being conducted. Each EOP Subsidiary is duly
qualified or licensed to do business and is in good standing in each
jurisdiction in which the nature of its business or the ownership or leasing of
its properties makes such qualification or licensing necessary, other than in
such jurisdictions where the failure to be so qualified or licensed,
individually or in the aggregate, would not have an EOP Material Adverse Effect.
Complete and correct copies of the Articles of Incorporation, Bylaws,
organization documents and partnership, joint venture and operating agreements
of each EOP Subsidiary, as amended to the date of this Agreement, have been
previously delivered or made available to Beacon. No effective amendment has
been made to the EOP Partnership Agreement since September 3, 1997.
 
     3.3 Capital Structure.
 
     (a) The authorized shares of beneficial interest of EOP consist of
750,000,000 EOP Common Shares, 152,180,770 of which are issued and outstanding
as of September 15, 1997 (including 502,740 EOP Common Shares owned by EOP
Partnership), and 100,000,000 preferred shares of beneficial interest, none of
which are issued or outstanding as of the date of this agreement.
 
     (b) Set forth in Schedule 3.3(b) to the EOP Disclosure Letter is a true and
complete list of the following: (i) each qualified or nonqualified option to
purchase EOP's shares of beneficial interest granted
 
                                       18
<PAGE>   407
 
under the Employee Share Option and Restricted Share Plan or any other formal or
informal arrangement (collectively, the "EOP Options"); and (ii) all other
warrants or other rights to acquire EOP's shares of beneficial interest, all
limited share appreciation rights, phantom shares, dividend equivalents,
performance units and performance shares which are outstanding on the date of
this Agreement. Schedule 3.3(b) to the EOP Disclosure Letter sets forth the EOP
Options granted to EOP's Chief Executive Officer and four other most highly
compensated officers, the date of each grant, the status of each EOP Option as
qualified or nonqualified under Section 422 of the Code, the number of EOP
Common Shares subject to each EOP Option, the number and type of EOP's shares of
beneficial interest subject to EOP Options that are currently exercisable, the
exercise price per share, and the number and type of such shares subject to
share appreciation rights. On the date of this Agreement, except as set forth in
this Section 3.3 or in Schedule 3.3(b) to the EOP Disclosure Letter, no shares
of beneficial interest of EOP were outstanding or reserved for issuance (except
for EOP Common Shares reserved for issuance upon redemption of EOP OP Units).
 
     (c) All outstanding shares of beneficial interest of EOP are duly
authorized, validly issued, fully paid and nonassessable and not subject to
preemptive rights. There are no bonds, debentures, notes or other indebtedness
of EOP having the right to vote (or convertible into, or exchangeable for,
securities having the right to vote) on any matters on which shareholders of EOP
may vote.
 
     (d) Except (i) as set forth in this Section 3.3 or in Schedule 3.3(d) to
the EOP Disclosure Letter and (ii) EOP OP Units, which may be redeemed for EOP
Common Shares, as of the date of this Agreement, there are no outstanding
securities, options, warrants, calls, rights, commitments, agreements,
arrangements or undertakings of any kind to which EOP or any EOP Subsidiary is a
party or by which such entity is bound, obligating EOP or any EOP Subsidiary to
issue, deliver or sell, or cause to be issued, delivered or sold, additional
shares of beneficial interest, voting securities or other ownership interests of
EOP or any EOP Subsidiary or obligating EOP or any EOP Subsidiary to issue,
grant, extend or enter into any such security, option, warrant, call, right,
commitment, agreement, arrangement or undertaking (other than to EOP or an EOP
Subsidiary).
 
     (e) As of the date hereof, 165,248,223 EOP OP Units are validly issued and
outstanding, fully paid and nonassessable and not subject to preemptive rights,
of which 155,196,855 are owned by EOP and EOP Subsidiaries. Schedule 3.3(e) to
the EOP Disclosure Schedule sets forth the name of each holder of EOP OP Units
and the number of EOP OP Units owned by each such holder as of the date of this
Agreement. The EOP OP Units are subject to no restrictions except as set forth
in the EOP Partnership Agreement. EOP Partnership has not issued or granted and
is not a party to any outstanding commitments of any kind relating to, or any
presently effective agreements or understandings with respect to, interests in
EOP Partnership, whether issued or unissued, or securities convertible or
exchangeable into interests in EOP Partnership.
 
     (f) All dividends on EOP Common Shares and all distributions on EOP OP
Units which have been declared prior to the date of this Agreement have been
paid in full, except that the dividends payable on EOP Common Shares (along with
the corresponding distributions payable on EOP OP Units) which were declared on
September 11, 1997 and are payable on October 9, 1997 have not yet been paid.
 
     (g) The EOP Common Shares and the EOP Preferred Shares to be issued by EOP,
and the EOP OP Units to be issued by the EOP Partnership pursuant to this
Agreement have been duly authorized for issuance, and upon issuance will be duly
and validly issued, fully paid and nonassessable.
 
     3.4 Other Interests. Except for interests in the EOP Subsidiaries and
certain other entities as set forth in Schedule 3.4(a) or Schedule 3.5 to the
EOP Disclosure Letter, neither EOP nor any of its Subsidiaries owns directly or
indirectly any interest or investment (whether equity or debt) in any
corporation, partnership, joint venture, business, trust or other entity (other
than investments in short-term investment securities). With respect to such
other interests, EOP or EOP Partnership is a partner or stockholder in good
standing, and owns such interests free and clear of all Liens. Neither EOP nor
any of the EOP Subsidiaries is in breach of any provision of any agreement,
document or contract governing its rights in or to the interests owned or held
by it, all of which agreements, documents and contracts are (a) set forth in
Schedule 3.4(b) to the EOP Disclosure Letter (or disclosed in the EOP SEC
Documents (as defined below)), (b) unmodified except as described therein and
(c) in full force and effect. To the Knowledge of EOP (as defined in Section
3.19), the other
 
                                       19
<PAGE>   408
 
parties to any such agreement, document or contract which is of a material
nature are not in breach of any of their respective obligations under such
agreements, documents or contracts.
 
     3.5 Authority; Noncontravention; Consents.
 
     (a) EOP has the requisite power and authority to enter into this Agreement
and, subject to the requisite shareholder approval of the Merger (the "EOP
Shareholder Approvals" and, together with the Beacon Shareholder Approvals, the
"Shareholder Approvals"), to consummate the transactions contemplated by this
Agreement to which EOP is a party. The execution and delivery of this Agreement
by EOP and the consummation by EOP of the transactions contemplated by this
Agreement to which EOP is a party have been duly authorized by all necessary
action on the part of EOP, except for and subject to the EOP Shareholder
Approvals and the requisite approval, if any is required, of the partners of EOP
Partnership. This Agreement has been duly executed and delivered by EOP and
constitutes a valid and binding obligation of EOP, enforceable against EOP in
accordance with and subject to its terms, subject to applicable bankruptcy,
insolvency, moratorium or other similar laws relating to creditors' rights and
general principles of equity.
 
     (b) EOP Partnership has the requisite partnership power and, subject to the
requisite partner approval of the Partnership Merger (if any), authority to
enter into this Agreement and to consummate the transactions contemplated by
this Agreement to which EOP Partnership is a party. The execution and delivery
of this Agreement by EOP Partnership and the consummation by EOP Partnership of
the transactions contemplated by this Agreement to which EOP Partnership is a
party have been duly authorized by all necessary action on the part of EOP
Partnership, except for and subject to the EOP Shareholder Approvals. This
Agreement has been duly executed and delivered by EOP Partnership and
constitutes a valid and binding obligation of EOP Partnership, enforceable
against EOP Partnership in accordance with and subject to its terms, subject to
applicable bankruptcy, insolvency, moratorium or other similar laws relating to
creditors' rights and general principles of equity.
 
     (c) Except as set forth in Schedule 3.5(c)(1) to the EOP Disclosure Letter,
the execution and delivery of this Agreement by EOP and EOP Partnership do not,
and the consummation of the transactions contemplated by this Agreement to which
EOP or EOP Partnership is a party and compliance by EOP or EOP Partnership with
the provisions of this Agreement will not, conflict with, or result in any
violation of or default (with or without notice or lapse of time, or both)
under, or give rise to a right of termination, cancellation or acceleration of
any material obligation or to loss of a material benefit under, or result in the
creation of any Lien upon any of the properties or assets of EOP or any EOP
Subsidiary under, (i) the EOP Declaration of Trust or the EOP Bylaws or the
comparable charter or organizational documents or partnership, operating or
similar agreement (as the case may be) of any other EOP Subsidiary, each as
amended or supplemented to the date of this Agreement, (ii) any loan or credit
agreement, note, bond, mortgage, indenture, reciprocal easement agreement, lease
or other agreement, instrument, permit, concession, franchise or license
applicable to EOP or any EOP Subsidiary or their respective properties or assets
or (iii) subject to the governmental filings and other matters referred to in
the following sentence, any Laws applicable to EOP or any EOP Subsidiary or
their respective properties or assets, other than, in the case of clause (ii) or
(iii), any such conflicts, violations, defaults, rights, loss or Liens that
individually or in the aggregate would not (x) have an EOP Material Adverse
Effect or (y) prevent the consummation of the transactions contemplated by this
Agreement. No consent, approval, order or authorization of, or registration,
declaration or filing with, any Governmental Entity is required by or with
respect to EOP or any EOP Subsidiary in connection with the execution and
delivery of this Agreement or the consummation by EOP of any of the transactions
contemplated by this Agreement, except for (i) the filing with the SEC of (x)
the Registration Statement (as defined in Section 5.1) and (y) such reports
under Section 13 (a) of the Exchange Act as may be required in connection with
this Agreement and the transactions contemplated by this Agreement, (ii) the
acceptance for record of the Articles of Merger by the Department, (iii) the
filing of the Certificate of Merger with the Secretary, (iv) such filings as may
be required in connection with the payment of any transfer and gains taxes and
(v) such other consents, approvals, orders, authorizations, registrations,
declarations and filings (A) as are set forth in Schedule 3.5(c)(2) to the EOP
Disclosure Letter or (B) as may be required under (x) federal, state or local
environmental laws or (y) the "blue sky" laws of various states, to the extent
applicable, or (C) which, if not obtained or made, would not prevent or delay in
 
                                       20
<PAGE>   409
 
any material respect the consummation of any of the transactions contemplated by
this Agreement or otherwise prevent EOP from performing its obligations under
this Agreement in any material respect or have, individually or in the
aggregate, an EOP Material Adverse Effect.
 
     3.6 SEC Documents; Financial Statements; Undisclosed Liabilities.  EOP and
EOP Operating Partnership have filed all required reports, schedules, forms,
statements and other documents with the SEC since July 8, 1997 through the date
hereof (the "EOP SEC Documents"). Schedule 3.6(a) to the EOP Disclosure Letter
contains a complete list of all EOP SEC Documents filed by EOP under the
Exchange Act since July 8, 1997 and on or prior to the date of this Agreement.
All of the EOP SEC Documents (other than preliminary material), as of their
respective filing dates, complied in all material respects with all applicable
requirements of the Securities Act and the Exchange Act and, in each case, the
rules and regulations promulgated thereunder applicable to such EOP SEC
Documents. None of the EOP SEC Documents at the time of filing contained any
untrue statement of a material fact or omitted to state any material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading, except to the extent such statements have been modified or
superseded by later EOP SEC Documents filed and publicly available prior to the
date of this Agreement. The consolidated financial statements of EOP and the EOP
Subsidiaries included in the EOP SEC Documents complied as to form in all
material respects with applicable accounting requirements and the published
rules and regulations of the SEC with respect thereto, have been prepared in
accordance with GAAP (except, in the case of unaudited statements, as permitted
by the applicable rules and regulations of the SEC) applied on a consistent
basis during the periods involved (except as may be indicated in the notes
thereto) and fairly presented, in accordance with the applicable requirements of
GAAP and the applicable rules and regulations of the SEC, the consolidated
financial position of EOP and the EOP Subsidiaries, taken as a whole, as of the
dates thereof and the consolidated results of operations and cash flows for the
periods then ended (subject, in the case of unaudited statements, to normal
year-end audit adjustments). Except for liabilities and obligations set forth in
the EOP SEC Documents or in Schedule 3.6(b) to the EOP Disclosure Letter,
neither EOP nor any EOP Subsidiary has any liabilities or obligations of any
nature (whether accrued, absolute, contingent or otherwise) required by GAAP to
be set forth on a consolidated balance sheet of EOP or in the notes thereto and
which, individually or in the aggregate, would have an EOP Material Adverse
Effect.
 
     3.7 Absence of Certain Changes or Events. Except as disclosed in the EOP
SEC Documents or in Schedule 3.7 to the EOP Disclosure Letter, since the date of
the most recent audited financial statements included in the EOP SEC Documents
(the "EOP Financial Statement Date"), EOP and the EOP Subsidiaries have
conducted their business only in the ordinary course (taking into account prior
practices, including the acquisition of properties and issuance of securities)
and there has not been (a) any material adverse change in the business,
financial condition or results of operations of EOP and the EOP Subsidiaries
taken as a whole (a "EOP Material Adverse Change"), nor has there been any
occurrence or circumstance that with the passage of time would reasonably be
expected to result in an EOP Material Adverse Change, (b) except for regular
quarterly distributions (in the case of EOP) not in excess of $.30 per EOP
Common Share, subject to rounding adjustments as necessary and with customary
record and payment dates, any authorization, declaration, setting aside or
payment of any dividend or other distribution (whether in cash, stock or
property) with respect to any of EOP's shares of beneficial interest, (c) any
split, combination or reclassification of any of EOP's shares of beneficial
interest, (d) any damage, destruction or loss, whether or not covered by
insurance, that has or would have an EOP Material Adverse Effect or (e) any
change made prior to the date of this Agreement in accounting methods,
principles or practices by EOP or any EOP Subsidiary materially affecting its
assets, liabilities or business, except insofar as may have been disclosed in
the EOP SEC Documents or required by a change in GAAP.
 
     3.8 Litigation. Except as disclosed in the EOP SEC Documents or in Schedule
3.8 to the EOP Disclosure Letter, and other than personal injury and other
routine tort litigation arising from the ordinary course of operations of EOP
and the EOP Subsidiaries (a) which are covered by adequate insurance or (b) for
which all material costs and liabilities arising therefrom are reimbursable
pursuant to common area maintenance or similar agreements, there is no suit,
action or proceeding pending (in which service of process has been received by
an employee of EOP or an EOP Subsidiary) or, to the Knowledge of EOP (as defined
in
 
                                       21
<PAGE>   410
 
Section 3.19), threatened in writing against or affecting EOP or any EOP
Subsidiary that, individually or in the aggregate, could reasonably be expected
to (i) have an EOP Material Adverse Effect or (ii) prevent the consummation of
any of the transactions contemplated by this Agreement, nor is there any
judgment, decree, injunction, rule or order of any Governmental Entity or
arbitrator outstanding against EOP or any EOP Subsidiary having, or which,
insofar as reasonably can be foreseen, in the future would have, any such
effect.
 
     3.9 Properties.
 
     (a) Except as set forth in Schedule 3.9(a) to the EOP Disclosure Letter,
EOP or one of the EOP Subsidiaries owns fee simple title to each of the real
properties listed in the EOP SEC Filings as owned by it (the "EOP Properties"),
except where the failure to own such title would not have an EOP Material
Adverse Effect.
 
     (b) The EOP Properties are not subject to any Encumbrances or Property
Restrictions which reasonably could be expected to cause an EOP Material Adverse
Effect.
 
     (c) Valid policies of title insurance have been issued insuring EOP's or
the applicable EOP Subsidiary's fee simple title or leasehold estate, as the
case may be, to the EOP Properties in amounts which are, except in the case of
San Felipe Plaza, at least equal to the purchase price thereof paid by EOP or
the applicable EOP Subsidiaries therefor, except where the failure to obtain
such title insurance would not have an EOP Material Adverse Effect.
 
     (d) EOP has no Knowledge (i) that it has failed to obtain a certificate,
permit or license from any governmental authority having jurisdiction over any
of the EOP Properties where such failure would have an EOP Material Adverse
Effect or of any pending threat of modification or cancellation of any of the
same which would have an EOP Material Adverse Effect, (ii) of any written notice
of any violation of any federal, state or municipal law, ordinance, order, rule,
regulation or requirement affecting any of the EOP Properties issued by any
governmental authorities which would have an EOP Material Adverse Effect or
(iii) of any structural defects relating to EOP Properties, EOP Properties whose
building systems are not in working order, physical damage to any EOP Property
for which there is no insurance in effect covering the cost of restoration, any
current renovation or uninsured restoration, except such structural defects,
building systems not in working order, physical damage, renovation and
restoration which, in the aggregate, would not have an EOP Material Adverse
Effect.
 
     (e) Except as set forth in Schedule 3.9(e) to the EOP Disclosure Letter,
neither EOP nor any of the EOP Subsidiaries has received any written or
published notice to the effect that (i) any condemnation or rezoning proceedings
are pending or threatened with respect to any of the EOP Properties or (ii) any
zoning, building or similar law, code, ordinance, order or regulation is or will
be violated by the continued maintenance, operation or use of any buildings or
other improvements on any of the EOP Properties or by the continued maintenance,
operation or use of the parking areas, other than such notices which, in the
aggregate, would not have an EOP Material Adverse Effect.
 
     (f) All work to be performed, payments to be made and actions to be taken
by EOP or the EOP Subsidiaries prior to the date hereof pursuant to any
agreement entered into with a governmental body or authority in connection with
a site approval, zoning reclassification or similar action relating to any EOP
Properties (e.g., Local Improvement District, Road Improvement District,
Environmental Mitigation), has been performed, paid or taken, as the case may
be, except where the failure to do so would, in the aggregate, not have an EOP
Material Adverse Effect, and EOP has no Knowledge of any planned or proposed
work, payments or actions that may be required after the date hereof pursuant to
such agreements.
 
     (g) The rent roll previously provided by EOP to Beacon (the "EOP Rent
Roll") lists each EOP Space Lease (as defined below) in effect as of the
respective dates in August 1997 indicated in the EOP Rent Roll. "EOP Space
Lease" means each lease or other right of occupancy affecting or relating to a
property in which EOP Partnership (or an entity in which it directly or
indirectly has an interest) is the landlord, either pursuant to the terms of the
lease agreement or as successor to any prior landlord, but excluding any ground
lease. EOP has made available to Beacon true, correct and complete copies of all
EOP Space Leases, including all amendments, modifications, supplements,
renewals, extensions and guarantees related thereto, as of the date
 
                                       22
<PAGE>   411
 
hereof. Except for discrepancies that, either individually or in the aggregate,
would not reasonably be expected to have an EOP Material Adverse Effect, all
information set forth in the EOP Rent Roll is true, correct, and complete as of
the date thereof. Except as set forth in a delinquency report made available to
EOP, neither EOP nor any EOP Subsidiary, on the one hand, nor, to the Knowledge
of EOP or EOP Partnership, any other party, on the other hand, is in monetary
default under any EOP Space Lease, except for such defaults that would not
reasonably be expected to have a Material Adverse Effect.
 
     3.10 Environmental Matters. Except as disclosed in the EOP SEC Documents or
on Schedule 3.10 to the EOP Disclosure Letter, (a) none of EOP, any of the EOP
Subsidiaries or, to EOP's Knowledge, any other Person has caused or permitted
the unlawful presence of any Hazardous Materials on or under any of the EOP
Properties or (b) any unlawful spills, releases, discharges or disposal of
Hazardous Materials to have occurred or be presently occurring on, under or from
the EOP Properties as a result of any construction on or operation and use of
such properties, which presence or occurrence would, individually or in the
aggregate, have an EOP Material Adverse Effect; and in connection with the
construction on or operation and use of the EOP Properties, EOP and the EOP
Subsidiaries have not failed to comply in any material respect with all
applicable local, state and federal environmental laws, regulations, ordinances
and administrative and judicial orders relating to the generation, recycling,
reuse, sale, storage, handling, transport and disposal of any Hazardous
Materials, except to the extent such failure to comply, individually or in the
aggregate, would not have an EOP Material Adverse Effect.
 
     3.11 Taxes.
 
     (a) Each of EOP and the EOP Subsidiaries (i) has filed all Tax returns and
reports required to be filed by it (after giving effect to any filing extension
properly granted by a Governmental Entity having authority to do so), and all
such returns and reports are accurate and complete in all material respects, and
(ii) has paid (or EOP has paid on its behalf) all Taxes shown on such returns
and reports as required to be paid by it except where the failure to file such
tax returns or reports and failure to pay such Taxes would not have an EOP
Material Adverse Effect. The most recent audited financial statements contained
in the EOP SEC Documents reflect an adequate reserve for all material Taxes
payable by EOP and the EOP Subsidiaries for all taxable periods and portions
thereof through the date of such financial statements. Since the EOP Financial
Statement Date, EOP has incurred no liability for taxes under Sections 857(b),
860(c) or 4981 of the Code, including without limitation any tax arising from a
prohibited transaction described in Section 857(b)(6) of the Code, and neither
EOP nor any EOP Subsidiary has incurred any material liability for taxes other
than in the ordinary course of business. No event has occurred, and no condition
or circumstance exists, which presents a material risk that any material Tax
described in the preceding sentence will be imposed upon EOP. To the Knowledge
of EOP, no deficiencies for any Taxes have been proposed, asserted or assessed
against EOP or any of the EOP Subsidiaries, and no requests for waivers of the
time to assess any such Taxes are pending.
 
     (b) EOP (i) has operated, and intends to continue to operate, in such a
manner as to qualify as a REIT within the meaning of Section 856 of the Code for
the taxable year ending December 31, 1997 and intends to continue to operate in
such a manner as to qualify as a REIT for the taxable year that includes the
Closing Date and (ii) has not taken or omitted to take any action which would
reasonably be expected to result in a challenge to its status as a REIT, and to
EOP's Knowledge, no such challenge is pending or threatened. Each EOP Subsidiary
which is a partnership, joint venture or limited liability company (i) has been
treated since its formation and continues to be treated for federal income tax
purposes as a partnership and not as a corporation or as an association taxable
as a corporation and (ii) has not since the later of its formation or the
acquisition by EOP of a direct or indirect interest therein, owned any assets
(including, without limitation, securities) that would cause EOP to violate
Section 856(c)(5) of the Code. Each EOP Subsidiary which is a corporation (other
than EOP Management Corp.) has been since its formation a qualified REIT
subsidiary under Section 856(i) of the Code. EOP Partnership is not a publicly
traded partnership within the meaning of Section 7704 of the Code. Except as set
forth in Schedule 3.11 to the EOP Disclosure Letter neither EOP nor any EOP
Subsidiary holds any asset (x) the disposition of which would be subject to
rules similar to Section 1374 of the Code as a result of a notice under IRS
Notice 88-19 or (y) which is subject to a consent filed pursuant to Section
341(f) of the Code and the regulations thereunder.
 
                                       23
<PAGE>   412
 
     3.12 Brokers; Schedule of Fees and Expenses. No broker, investment banker,
financial advisor or other person, other than J.P. Morgan Securities Inc. and
Merrill Lynch & Co., the fees and expenses of which will be paid by EOP and are
described in the respective engagement letters with J.P. Morgan Securities Inc.
and Merrill Lynch & Co., true, correct and complete copies of which have
previously been given to Beacon, is entitled to any broker's, finder's,
financial advisor's or other similar fee or commission in connection with the
transactions contemplated hereby based upon arrangements made by or on behalf of
EOP or any EOP Subsidiary.
 
     3.13 Compliance with Laws. Neither EOP nor any of the EOP Subsidiaries has
violated or failed to comply with any statute, law, ordinance, regulation, rule,
judgment, decree or order of any Governmental Entity applicable to its business,
properties or operations, except to the extent that such violation or failure
would not have an EOP Material Adverse Effect.
 
     3.14 Contracts; Debt Instruments. Neither EOP nor any EOP Subsidiary has
received a written notice that EOP or any EOP Subsidiary is in violation of or
in default under (nor to the Knowledge of EOP does there exist any condition
which upon the passage of time or the giving of notice or both would cause such
a violation of or default under) any material loan or credit agreement, note,
bond, mortgage, indenture, lease, permit, concession, franchise, license or any
other material contract, agreement, arrangement or understanding, to which it is
a party or by which it or any of its properties or assets is bound, nor to the
Knowledge of EOP does such a violation or default exist, except to the extent
such violation or default, individually or in the aggregate, would not have an
EOP Material Adverse Effect, except as set forth in the EOP SEC Documents or in
Schedule 3.14 to the EOP Disclosure Letter.
 
     3.15 Opinion of Financial Advisor. EOP has received the oral opinion of
J.P. Morgan Securities Inc., satisfactory to EOP, to the effect that the
consideration to be paid by EOP and EOP Partnership in connection with the
Mergers is fair, from a financial point of view, to EOP and EOP Operating
Partnership.
 
     3.16 State Takeover Statutes. EOP has taken all action necessary to exempt
transactions between EOP and Beacon and its Affiliates from the operation of
Takeover Statutes.
 
     3.17 Investment Company Act of 1940. Neither EOP nor any of the EOP
Subsidiaries is, or at the Effective Time will be, required to be registered
under the 1940 Act.
 
     3.18 Definition of Knowledge of EOP. As used in this Agreement, the phrase
"Knowledge of EOP" (or words of similar import) means the knowledge of those
individuals identified in Schedule 3.19 to the EOP Disclosure Letter.
 
     3.19 EOP Not an Interested Stockholder. EOP is not an "interested
stockholder" of Beacon or an "affiliate of an interested stockholder" of Beacon
within the meaning of Section 3-601 of the MGCL.
 
                                   ARTICLE 4
 
                                   COVENANTS
 
     4.1 Conduct of Beacon's and Beacon Partnership's Business Pending
Merger. During the period from the date of this Agreement to the Effective Time,
except as consented to in writing by EOP or as expressly provided for in this
Agreement (including as contemplated by the Principal Terms of the Tax
Protection Agreements set forth as Schedule 5.16 hereto), Beacon and Beacon
Partnership shall, and shall cause (or, in the case of Beacon Subsidiaries that
Beacon or Beacon Partnership do not control, shall use reasonable best efforts
to cause) each of the Beacon Subsidiaries to:
 
          (a) conduct its business only in the usual, regular and ordinary
     course and in substantially the same manner as heretofore conducted;
 
          (b) preserve intact its business organizations and goodwill and use
     reasonable best efforts to keep available the services of its officers and
     employees;
 
                                       24
<PAGE>   413
 
          (c) confer on a regular basis with one or more representatives of EOP
     to report operational matters of materiality and, subject to Section 4.3,
     any proposals to engage in material transactions;
 
          (d) promptly notify EOP of any material emergency or other material
     change in the condition (financial or otherwise), business, properties,
     assets, liabilities or the normal course of its businesses or in the
     operation of its properties, or of any material governmental complaints,
     investigations or hearings (or communications indicating that the same may
     be contemplated);
 
          (e) promptly deliver to EOP true and correct copies of any report,
     statement or schedule filed with the SEC subsequent to the date of this
     Agreement;
 
          (f) maintain its books and records in accordance with GAAP
     consistently applied and not change in any material manner any of its
     methods, principles or practices of accounting in effect at the Beacon
     Financial Statement Date, except as may be required by the SEC, applicable
     law or GAAP;
 
          (g) duly and timely file all reports, tax returns and other documents
     required to be filed with federal, state, local and other authorities,
     subject to extensions permitted by law, provided Beacon notifies EOP that
     it is availing itself of such extensions and provided such extensions do
     not adversely affect Beacon's status as a qualified REIT under the Code;
 
          (h) not make or rescind any express or deemed election relative to
     Taxes (unless required by law or necessary to preserve Beacon's status as a
     REIT or the status of any Beacon Subsidiary as a partnership for federal
     income tax purposes, as the case may be);
 
          (i) make all capital expenditures, and expenditures relating to
     leasing, in accordance with a budget of Beacon approved by EOP, which
     approval shall not be unreasonably withheld, and will not (A) acquire,
     enter into any option to acquire, or exercise an option or other right or
     election or enter into any other commitment or contractual obligation
     (each, a "Commitment") for the acquisition of any real property or other
     transaction (other than Commitments referred to in Schedule 4.1(i) to the
     Beacon Disclosure Letter) involving in excess of $100,000 which is not
     included in its budget approved by EOP, encumber assets or commence
     construction of, or enter into any Commitment to develop or construct other
     real estate projects, except in the ordinary course of its office property
     business or (B) incur or enter into any Commitment to incur additional
     indebtedness (secured or unsecured) except for working capital under its
     revolving line(s) of credit and Commitments for indebtedness described on
     Schedule 4.1(i) to the Beacon Disclosure Letter;
 
          (j) not amend its Articles of Incorporation, as amended, or its
     Amended and Restated Bylaws, or the articles or certificate of
     incorporation, bylaws, code of regulations, partnership agreement,
     operating agreement or joint venture agreement or comparable charter or
     organization document of any Beacon Subsidiary;
 
          (k) make no change in the number of shares of capital stock,
     membership interests or units of limited partnership interest issued and
     outstanding, other than pursuant to (i) the exercise of options disclosed
     in Schedule 2.3 to the Beacon Disclosure Letter or (ii) the redemption of
     Beacon OP Units under existing contracts described on Schedule 2.18, or
     pursuant to the Beacon Partnership Agreement, for cash or, at Beacon's
     option, Beacon Common Shares;
 
          (l) grant no options or other right or commitment relating to its
     shares of capital stock, membership interests or units of limited
     partnership interest or any security convertible into its shares of capital
     stock, membership interests or units of limited partnership interest, or
     any security the value of which is measured by shares of capital stock, or
     any security subordinated to the claim of its general creditors and not
     amend or waive any rights under any of the Beacon Stock Options;
 
          (m) except as provided in Section 5.10 and in connection with the use
     of Beacon Common Shares to pay the exercise price or tax withholding in
     connection with equity-based employee benefit plans by the participants
     therein, not (i) authorize, declare, set aside or pay any dividend or make
     any other distribution or payment with respect to any Beacon Common Shares
     or Beacon OP Units or (ii) directly or indirectly redeem, purchase or
     otherwise acquire any shares of capital stock, membership interests or
 
                                       25
<PAGE>   414
 
     units of partnership interest or any option, warrant or right to acquire,
     or security convertible into, shares of capital stock, membership
     interests, or units of partnership interest of Beacon, except for (A)
     redemptions of Beacon Common Shares required under Section 9.5 of the
     Articles of Incorporation of Beacon in order to preserve the status of
     Beacon as a REIT under the Code, and (B) redemptions of Beacon OP Units,
     whether or not outstanding on the date of this Agreement, under the Beacon
     Partnership Agreement in which Beacon Common Shares are utilized;
 
          (n) not sell, lease, mortgage, subject to Lien or otherwise dispose of
     any of the Beacon Properties, except in connection with a transaction that
     is permitted by Section 4.1(i) or that is made in the ordinary course of
     business and is the subject of a binding contract in existence on the date
     of this Agreement and disclosed in Schedule 2.18 to the Beacon Disclosure
     Schedule;
 
          (o) not sell, lease, mortgage, subject to Lien or otherwise dispose of
     any of its personal property or intangible property, except in connection
     with a transaction that is permitted by Section 4.1(n) or that is made in
     the ordinary course of business and is not material, individually or in the
     aggregate;
 
          (p) not make any loans, advances or capital contributions to, or
     investments in, any other Person, other than loans, advances and capital
     contributions to Beacon Subsidiaries in existence on the date hereof;
 
          (q) not pay, discharge or satisfy any claims, liabilities or
     obligations (absolute, accrued, asserted or unasserted, contingent or
     otherwise), other than the payment, discharge or satisfaction, in the
     ordinary course of business consistent with past practice or in accordance
     with their terms, of liabilities reflected or reserved against in, or
     contemplated by, the most recent consolidated financial statements (or the
     notes thereto) furnished to EOP or incurred in the ordinary course of
     business consistent with past practice;
 
          (r) not guarantee the indebtedness of another Person, enter into any
     "keep well" or other agreement to maintain any financial statement
     condition of another Person or enter into any arrangement having the
     economic effect of any of the foregoing;
 
          (s) not enter into any Commitment with any officer, director or
     Affiliate of Beacon or any of the Beacon Subsidiaries or any material
     Commitment with any consultant;
 
          (t) not increase any compensation or enter into or amend any
     employment agreement described in Schedule 2.18 to the Beacon Disclosure
     Letter with any of its officers, directors or employees earning more than
     $50,000 per annum, other than as required by any contract or Plan or in
     accordance with waivers by employees of benefits under such agreements;
 
          (u) not adopt any new employee benefit plan or amend any existing
     plans or rights, except for changes to severance benefits to provide that
     an employee whose position is transferred to a location outside the
     standard metropolitan statistical area in which such employee is currently
     employed shall not forfeit severance benefits by reason of failure to
     accept such transfer, changes which are required by law and changes which
     are not more favorable to participants than provisions presently in effect;
 
          (v) not settle any shareholder derivative or class action claims
     arising out of or in connection with any of the transactions contemplated
     by this Agreement;
 
          (w) not change the ownership of any of its Subsidiaries, except
     changes which arise as a result of the acquisition of Beacon OP Units in
     exchange for Beacon Common Shares pursuant to exercise of the Beacon OP
     Unit redemption right under Section 8.6 of the Beacon Partnership
     Agreement;
 
          (x) not accept a promissory note in payment of the exercise price
     payable under any option to purchase Beacon Common Shares; and
 
          (y) not enter into, or modify, amend or breach any Tax Protection
     Agreement.
 
     4.2 Conduct of EOP's and EOP Partnership's Business Pending Merger. During
the period from the date of this Agreement to the Effective Time, except as (i)
contemplated by this Agreement, or (ii) consented to in writing by Beacon, EOP
and EOP Partnership shall, and shall cause (or, in the case of EOP Subsidiaries
 
                                       26
<PAGE>   415
 
that EOP or EOP Partnership do not control, use reasonable best efforts to
cause) each of the EOP Subsidiaries to:
 
          (a) preserve intact its business organizations and goodwill and use
     reasonable best efforts to keep available the services of its officers and
     employees;
 
          (b) confer on a regular basis with one or more representatives of
     Beacon to report operational matters of materiality which would have an EOP
     Material Adverse Effect;
 
          (c) promptly notify Beacon of any material emergency or other material
     change in the condition (financial or otherwise), business, properties,
     assets, liabilities, prospects or the normal course of its businesses or in
     the operation of its properties, or of any material governmental
     complaints, investigations or hearings (or communications indicating that
     the same may be contemplated);
 
          (d) promptly deliver to Beacon true and correct copies of any report,
     statement or schedule filed with the SEC subsequent to the date of this
     Agreement;
 
          (e) maintain its books and records in accordance with GAAP
     consistently applied and not change in any material manner any of its
     methods, principles or practices of accounting in effect at the EOP
     Financial Statement Date, except as may be required by the SEC, applicable
     law or GAAP;
 
          (f) duly and timely file all reports, tax returns and other documents
     required to be filed with federal, state, local and other authorities,
     subject to extensions permitted by law, provided such extensions do not
     adversely affect EOP's status as a qualified REIT under the Code;
 
          (g) not make or rescind any express or deemed election relative to
     Taxes (unless required by law or necessary to preserve EOP's status as a
     REIT or the status of any EOP Subsidiary as a partnership for federal
     income tax purposes or as a qualified REIT subsidiary under Section 856(i)
     of the Code, as the case may be);
 
          (h) not enter into any Commitment for the acquisition of any real
     property (other than all real estate projects described in Schedule 4.2(h)
     to the EOP Disclosure Letter) if the amount of such Commitment would cause
     the aggregate amount of all such Commitments subsequent to the date hereof
     to exceed $1,300,000,000 unless such Commitment has been approved by
     Beacon;
 
          (i) not amend the EOP Declaration of Trust or the EOP Bylaws, or the
     articles or certificate of incorporation, bylaws, code of regulations,
     partnership agreement, operating agreement or joint venture agreement or
     comparable charter or organization document of any EOP Subsidiary,
     including the EOP Partnership Agreement (except to the extent necessary to
     reflect the admission of additional limited partners and other amendments
     in connection therewith that can be made by EOP without a vote of limited
     partners and that will not, individually or in the aggregate, materially
     adversely affect the rights or obligations of holders of EOP OP Units);
 
          (j) except as provided in Section 5.10 hereof and in connection with
     the use of EOP Common Shares to pay the exercise price or tax withholding
     in connection with equity-based employee benefit plans by the participants
     therein, not (i) authorize, declare, set aside or pay any dividend or make
     any other distribution or payment with respect to any EOP Common Shares or
     EOP OP Units or (ii) directly or indirectly redeem, purchase or otherwise
     acquire any shares of capital stock, membership interests or units of
     partnership interest or any option, warrant or right to acquire, or
     security convertible into, shares of capital stock, membership interests,
     or units of partnership interest of EOP, except for (A) redemptions of EOP
     Common Shares required under Section 7.3.6 of the EOP Declaration of Trust
     in order to preserve the status of EOP as a REIT under the Code, and (B)
     redemptions of EOP OP Units, whether or not outstanding on the date of this
     Agreement, under the EOP Partnership Agreement in which EOP Common Shares
     are utilized;
 
          (k) not sell, lease, mortgage, subject to Lien or otherwise dispose of
     any of the EOP Properties, except in connection with a transaction that
     would not reasonably be expected to have an EOP Material Adverse Effect;
 
                                       27
<PAGE>   416
 
          (l) not sell, lease, mortgage, subject to Lien or otherwise dispose of
     any of its personal property or intangible property, except in connection
     with a transaction that is permitted by Section 4.2(k) or that is not
     material, individually or in the aggregate;
 
          (m) not pay, discharge or satisfy any claims, liabilities or
     obligations (absolute, accrued, asserted or unasserted, contingent or
     otherwise) if it would reasonably be expected to have an EOP Material
     Adverse Effect;
 
          (n) not directly or indirectly through a subsidiary, merge or
     consolidate with, or acquire all or substantially all of the assets of, or
     the beneficial ownership of a majority of the outstanding capital stock or
     other equity interests in any person or entity whose securities are
     registered under the Exchange Act unless such transaction has been approved
     by Beacon; and
 
          (o) except as contemplated by this Agreement, not issue any EOP or EOP
     Partnership securities pursuant to a Registration Statement filed with the
     SEC relating to the public offering of any EOP or EOP Partnership
     securities from the date hereof until the date of the Proxy Statement (as
     defined in Section 5.1) unless such issuance has been approved by Beacon.
 
     4.3 No Solicitation. Prior to the Effective Time, Beacon agrees, for itself
and in its capacity as general partner of the Beacon Partnership, that:
 
          (a) neither it nor any of the Beacon Subsidiaries shall invite,
     initiate, solicit or encourage, directly or indirectly, any inquiries,
     proposals, discussions or negotiations or the making or implementation of
     any proposal or offer (including, without limitation, any proposal or offer
     to its shareholders) with respect to a merger, acquisition, tender offer,
     exchange offer, transaction resulting in the issuance of securities
     representing 10% or more of the outstanding equity securities of Beacon,
     consolidation, share exchange, business combination, sale, lease, exchange,
     mortgage, pledge, transfer or other disposition of 10% or more of the
     assets or equity securities (including, without limitation, partnership
     interests and units) of Beacon or Beacon Partnership, other than the
     transactions contemplated by this Agreement (any such proposal or offer
     being hereinafter referred to as an "Acquisition Proposal") or engage in
     any discussions or negotiations concerning or provide any confidential or
     non-public information or data to, or have any discussions with, any person
     relating to an Acquisition Proposal, or otherwise facilitate any effort or
     attempt to make or implement an Acquisition Proposal;
 
          (b) neither it nor any of the Beacon Subsidiaries will permit any of
     its officers, directors, employees, affiliates, agents, investment bankers,
     financial advisors, attorneys, accountants, brokers, finders or other
     representative retained by Beacon to engage in any of the activities
     described in Section 4.3(a);
 
          (c) it and the Beacon Subsidiaries will immediately cease and cause to
     be terminated any existing activities, discussions or negotiations with any
     parties conducted heretofore with respect to any of the foregoing and will
     take the necessary steps to inform the individuals or entities referred to
     in Section 4.3(b) of the obligations undertaken in this Section 4.3; and
 
          (d) it will notify EOP immediately if Beacon or any of the Beacon
     Subsidiaries receives any such inquiries or proposals, or any requests for
     such information, or if any such negotiations or discussions are sought to
     be initiated or continued with it;
 
provided, however, that nothing contained in this Section 4.3 shall prohibit the
Board of Directors of Beacon (including with respect to Beacon's capacity as
general partner of Beacon Partnership) from (i) furnishing information to or
entering into discussions or negotiations with, any person or entity that makes
an unsolicited Acquisition Proposal, if, and only to the extent that (A) a
majority of the Board of Directors of Beacon determines in good faith, based
upon the advice of its outside counsel, that such action is required for the
Board of Directors of Beacon to comply with its duties to shareholders imposed
by applicable law and (B) prior to furnishing such information to, or entering
into discussions or negotiations with, such person or entity, Beacon provides
written notice to EOP to the effect that it is furnishing information to, or
entering into discussions with, such person or entity; and (ii) making any
disclosure required by applicable law with regard to an Acquisition Proposal.
Nothing in this Section 4.3 shall (x) permit Beacon to terminate this Agreement
 
                                       28
<PAGE>   417
 
(except as specifically provided in Article 7 hereof), (y) permit Beacon to
enter into an agreement for an Acquisition Proposal during the term of this
Agreement or (z) affect any other obligation of Beacon under this Agreement;
provided, however, that a majority of the Board of Directors of Beacon may
approve and recommend a Superior Acquisition Proposal and, in connection
therewith, withdraw or modify its approval or recommendation of this Agreement
and the Merger in accordance with Section 5.1(e). Any disclosure that the Board
of Directors of Beacon may be compelled to make with respect to the receipt of
an Acquisition Proposal in order to comply with its duties to shareholders
imposed by applicable law or Rule 14d-9 or 14e-2 of the Exchange Act will not
constitute a violation of this Section 4.3. As used herein, "Superior
Acquisition Proposal" means a bona fide Acquisition Proposal made by a third
party which a majority of the members of the Board of Directors of Beacon
resolves in good faith to be in the best interests of and more favorable to
Beacon's shareholders than the Merger and which the Board of Directors of Beacon
determines is reasonably capable of being consummated.
 
     4.4 Affiliates. Prior to the Effective Time, Beacon shall cause to be
prepared and delivered to EOP a list (reasonably satisfactory to counsel for
EOP) identifying all persons who, at the time of the Beacon and EOP Shareholders
Meetings, may be deemed to be "affiliates" of Beacon as that term is used in
paragraphs (c) and (d) of Rule 145 under the Securities Act (the "Affiliates").
Beacon shall use its reasonable best efforts to cause each person who is
identified as an Affiliate in such list to deliver to EOP on or prior to the
Effective Time a written agreement, in the form previously approved by the
parties hereto, that such Affiliate will not sell, pledge, transfer or otherwise
dispose of any EOP Common Shares issued to such Affiliate pursuant to the
Merger, except pursuant to an effective registration statement under the
Securities Act or in compliance with paragraph (d) of Rule 145 or as otherwise
permitted by the Securities Act. EOP shall be entitled to place legends as
specified in such written agreements on the certificates representing any EOP
Common Shares to be received pursuant to the terms of this Agreement by such
Affiliates who have executed such agreements and to issue appropriate stop
transfer instructions to the transfer agent for the EOP Common Shares issued to
such Affiliates, consistent with the terms of such agreements. The Surviving
Trust shall timely file the reports required to be filed by it under the
Exchange Act and the rules and regulations adopted by the SEC thereunder, and it
will take such further action as any Affiliate of Beacon or EOP may reasonably
request, all to the extent required from time to time to enable such Affiliate
to sell shares of beneficial interest of the Surviving Trust received by such
Affiliate in the Merger without registration under the Securities Act pursuant
to (i) Rule 145(d)(1) under the Securities Act, as such rule may be amended from
to time, or (ii) any successor rule or regulation hereafter adopted by the SEC.
 
     4.5 Other Actions. Each of Beacon and Beacon Partnership on the one hand
and EOP and EOP Partnership on the other hand shall not, and shall use
commercially reasonable efforts to cause their respective subsidiaries and joint
ventures not to take, any action that would result in (i) any of the
representations and warranties of such party (without giving effect to any
"knowledge" qualification) set forth in this Agreement that are qualified as to
materiality becoming untrue, (ii) any of such representations and warranties
(without giving effect to any "knowledge" qualification) that are not so
qualified becoming untrue in any material respect or (iii) except as
contemplated by Section 4.3, any of the conditions to the Merger set forth in
Article 6 not being satisfied.
 
                                   ARTICLE 5
 
                              ADDITIONAL COVENANTS
 
     5.1 Preparation of the Registration Statement and the Proxy Statement;
Beacon Shareholders Meeting, Beacon Unitholders Consent Solicitation and EOP
Shareholders Meeting.
 
     (a) As promptly as practicable after execution of this Agreement, (i) each
of Beacon and EOP shall prepare and file with the SEC (with appropriate requests
for confidential treatment, unless the parties hereto otherwise agree) under the
Exchange Act, (x) one or more joint proxy statements/prospectuses and forms of
proxies (such joint proxy statement(s)/prospectus(es) together with any
amendments to supplements thereto, the "Proxy Statement") relating to the
stockholder meetings of each of Beacon and EOP, the vote of the stockholders of
Beacon and EOP with respect to the Merger, and the consent, if any, of partners
of Beacon
 
                                       29
<PAGE>   418
 
Partnership and EOP Partnership in connection with any required Partner
Approvals and (y) an information statement/prospectus relating to the issuance
of EOP Preferred Shares pursuant to the Merger and (ii) following clearance by
the SEC of the Proxy Statement, EOP shall within two business days prepare and
file with the SEC under the Securities Act a registration statement on Form S-4
(such registration statement, together with any amendments or supplements
thereto, the "Form S-4"), in which the Proxy Statement and any information
statement/prospectus described in clause (y) above will be included, as one or
more prospectuses in connection with the registration under the Securities Act
of the EOP Common Shares, EOP Preferred Shares and EOP OP Units to be
distributed to the holders of Beacon Common Shares, Beacon Preferred Stock and
Beacon OP Units in the Merger. The respective parties will cause the Proxy
Statement and the Form S-4 to comply as to form in all material respects with
the applicable provisions of the Securities Act, the Exchange Act and the rules
and regulations thereunder. Each of Beacon, Beacon Partnership, EOP and EOP
Partnership shall furnish all information about itself and its business and
operations and all necessary financial information to the other as the other may
reasonably request in connection with the preparation of the Proxy Statement and
the Form S-4. EOP shall use its reasonable best efforts, and Beacon will
cooperate with it, to have the Form S-4 declared effective by the SEC as
promptly as practicable (including clearing the Proxy Statement with the SEC),
taking into account EOP's permitted activities hereunder and applicable legal
requirements. Each of Beacon and Beacon Partnership, on the one hand, and EOP
and EOP Partnership, on the other hand, agree promptly to correct any
information provided by it for use in the Proxy Statement and the Form S-4 if
and to the extent that such information shall have become false or misleading in
any material respect, and each of the parties hereto further agrees to take all
steps necessary to amend or supplement the Proxy Statement and the Form S-4 and
to cause the Proxy Statement and the Form S-4 as so amended or supplemented to
be filed with the SEC and to be disseminated to their respective stockholders
and partners, in each case as and to the extent required by applicable federal
and state securities laws. Each of Beacon, Beacon Partnership, EOP and EOP
Partnership agrees that the information provided by it for inclusion in the
Proxy Statement or the Form S-4 and each amendment or supplement thereto, at the
time of mailing thereof and at the time of the respective meetings of
stockholders of Beacon and EOP and at the time of the respective taking of
consents, if any, of partners of Beacon Partnership and EOP Partnership, will
not include an untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading. EOP
will advise and deliver copies (if any) to Beacon, promptly after it receives
notice thereof, of any request by the SEC for amendment of the Proxy Statement
or the Form S-4 or comments thereon and responses thereto or requests by the SEC
for additional information (regardless whether such requests relate to EOP or
EOP Partnership, on the one hand, and Beacon or Beacon Partnership, on the other
hand), and EOP shall promptly notify Beacon of (i) the time when the Form S-4
has become effective, (ii) or any supplement or amendment thereto has been
filed, (iii) the issuance of any stop order, and (iv) the suspension of the
qualification and registration of the EOP Common Shares, EOP Preferred Shares
and EOP OP Units issuable in connection with the Mergers.
 
     (b) Each of Beacon, Beacon Partnership, EOP and EOP Partnership shall use
its reasonable best efforts to timely mail the joint proxy statement/prospectus
contained in the Form S-4 to its stockholders. It shall be a condition to the
mailing of the joint proxy statement/prospectus that (i) EOP and EOP Partnership
shall have received a "comfort" letter from Coopers & Lybrand, LLP, independent
public accountants for Beacon and Beacon Partnership, of the kind contemplated
by the Statement of Auditing Standards with respect to Letters to Underwriters
promulgated by the American Institute of Certified Public Accountants (the
"AICPA Statement"), dated as of the date on which the Form S-4 shall become
effective and as of the Effective Time, addressed to EOP and EOP Partnership, in
form and substance reasonably satisfactory to EOP and EOP Partnership,
concerning the procedures undertaken by Coopers & Lybrand, LLP with respect to
the financial statements and information of Beacon, Beacon Partnership and their
subsidiaries contained in the Form S-4 and the other matters contemplated by the
AICPA Statement and otherwise customary in scope and substance or letters
delivered by independent public accountants in connection with transactions such
as those contemplated by this Agreement and (ii) Beacon shall have received a
"comfort" letter from Ernst & Young LLP, independent public accountants for EOP
and EOP Partnership, of the kind contemplated by the AICPA Statement, dated as
of the date on which the Form S-4 shall become effective and as of the Effective
Time,
 
                                       30
<PAGE>   419
 
addressed to Beacon and Beacon Partnership, in form and substance reasonably
satisfactory to Beacon, concerning the procedures undertaken by Ernst & Young,
LLP with respect to the financial statements and information of EOP, EOP
Partnership and their subsidiaries contained in the Form S-4 and the other
matters contemplated by the AICPA Statement and otherwise customary in scope and
substance for letters delivered by independent public accountants in connection
with transactions such as those contemplated by this Agreement.
 
     (c) EOP will duly call and as soon as practicable following the date of
this Agreement (but in no event sooner than 20 business days following the date
the Proxy Statement is mailed to the shareholders of EOP), give notice of,
convene and hold a meeting of its shareholders (the "EOP Shareholders Meeting")
for the purpose of obtaining the EOP Shareholder Approvals. EOP will, through
its Board of Trustees, recommend to its shareholders approval of this Agreement,
the Merger, and the transactions contemplated by this Agreement.
 
     (d) On or before September 22, 1997, EOP and EOP Partnership shall deliver
to Beacon and Beacon Partnership (i) a list of all information to be provided by
Beacon or Beacon Partnership that is required to be included in the Proxy
Statement in accordance with the applicable provisions of the Securities Act,
the Exchange Act and the rules and regulations thereunder and (ii) an
irrevocable letter of credit in the face amount of $10,000,000 issued by a bank
reasonably acceptable to the parties, naming Beacon Partnership as beneficiary,
expiring no sooner than June 1, 1998 and payable at site upon presentation of a
sight draft and an affidavit of Beacon Partnership stating that all conditions
to a draw under the letter of credit pursuant to this Section 5.1(d) have been
met and the beneficiaries are entitled to draw the full amount thereunder. In
addition, in the event that EOP and EOP Partnership shall fail to file the Proxy
Statement with the SEC within fifteen (15) days after EOP and EOP Partnership
have received all information requested pursuant to clause (i) above
substantially in final form, EOP and EOP Partnership shall deliver to Beacon and
Beacon Partnership another irrevocable letter of credit in the face amount of
$5,000,000 and otherwise satisfying the requirements of clause (ii) above. In
the event Beacon shall terminate this Agreement pursuant to Section 7.1(e), and
provided that Beacon shall not have breached in any material respect its
obligations under this Agreement in any manner that shall have caused the
occurrence of either of the events referred to in clauses (x) and (y) to this
Section 5.1(d), then at any time following the expiration of three (3) business
days after EOP's receipt of written notice of such termination, Beacon shall be
entitled to draw on the letter(s) of credit posted pursuant to this Section
5.1(c) if either of the following events has occurred: (x) EOP and EOP
Partnership shall have failed to file the Proxy Statement with the SEC within
fifteen (15) days after EOP and EOP Partnership have received all information
requested pursuant to clause (i) above substantially in final form or (y) the
Form S-4 shall not have been declared effective by the SEC on or before February
27, 1998. The receipt of Beacon and Beacon Partnership of any amounts pursuant
to this Section 5.1(d) shall not affect the other remedies, if any, available to
such parties.
 
     (e) Beacon will duly call and give notice of and, as soon as practicable
following the date of this Agreement (but in no event sooner than 20 business
days following the date the Proxy Statement is mailed to the shareholders of
Beacon), convene and hold a meeting of its shareholders (the "Beacon
Shareholders Meeting") for the purpose of obtaining Beacon Shareholder
Approvals. Beacon will, through its Board of Directors, recommend to its
shareholders approval of this Agreement, the Merger and the transactions
contemplated by this Agreement and include such recommendation in the Proxy
Statement; provided, however, that prior to the Beacon Shareholders Meeting,
such recommendation may be withdrawn, modified or amended if a majority of the
Board of Directors of Beacon determines in good faith, based upon the advice of
its outside counsel, that such action is required for the Board of Directors of
Beacon to comply with its duties to its shareholders imposed by applicable law.
 
     (f) EOP and Beacon shall use their best efforts to convene their respective
shareholder meetings on the same day, which day, subject to the provisions of
Sections 5.1(c), 5.1(d) and 5.3, shall be a day not later than 45 days after the
date the Proxy Statement is mailed.
 
     (g) If on the date for the EOP Shareholders Meeting and Beacon Shareholders
Meeting established pursuant to Section 5.1(f) of this Agreement, either EOP or
Beacon has not received duly executed proxies
 
                                       31
<PAGE>   420
 
for a sufficient number of votes to approve the Merger (but less than a majority
of the outstanding Beacon Common Shares or EOP Common Shares, as the case may
be, have voted against the Merger), then both parties shall recommend the
adjournment of their respective shareholders meetings until one or more dates
not later than the date ten (10) days after the originally scheduled date of the
shareholders meetings.
 
     (h) Beacon will request written consents for approval by the limited
partners of Beacon Partnership of each of the matters described in the
definition of Beacon Partner Approvals. Beacon hereby agrees to vote in favor of
such matters and to recommend to the limited partners of Beacon Partnership that
they approve such matters. EOP will request written consents, if any is
required, by the limited partners, of EOP Partnership of each of the matters
described in the definition of EOP Partner Approvals. EOP hereby agrees to vote,
if any is required, in favor of such matters and to recommend to the limited
partners of EOP Partnership that they approve such matters.
 
     5.2  Access to Information; Confidentiality. Subject to the requirements of
confidentiality agreements with third parties, each of the parties shall, and
shall cause each of its Subsidiaries to, afford to the other parties and to the
officers, employees, accountants, counsel, financial advisors and other
representatives of such other parties, reasonable access during normal business
hours prior to the Effective Time to all their respective properties, books,
contracts, commitments, personnel and records and, during such period, each of
the parties shall, and shall cause each of its Subsidiaries to, furnish promptly
to the other parties (a) a copy of each report, schedule, registration statement
and other document filed by it during such period pursuant to the requirements
of federal or state securities laws and (b) all other information concerning its
business, properties and personnel as such other party may reasonably request.
Each of the parties shall, and shall cause its Subsidiaries to, use commercially
reasonable efforts to cause its officers, employees, accountants, counsel,
financial advisors and other representatives and affiliates to, hold any
nonpublic information in confidence.
 
     5.3  Reasonable Best Efforts; Notification.
 
     (a) Subject to the terms and conditions herein provided, each of the
parties shall: (i) use all reasonable best efforts to cooperate with one another
in (A) determining which filings are required to be made prior to the Effective
Time with, and which consents, approvals, permits or authorizations are required
to be obtained prior to the Effective Time from, governmental or regulatory
authorities of the United States, the several states and foreign jurisdictions
and any third parties in connection with the execution and delivery of this
Agreement, and the consummation of the transactions contemplated hereby and (B)
timely making all such filings and timely seeking all such consents, approvals,
permits and authorizations; (ii) use all reasonable best efforts (other than the
payment of money) to obtain in writing any consents required from third parties
to effectuate the Merger, such consents to be in form reasonably satisfactory to
each of the parties; and (iii) use all reasonable best efforts to take, or cause
to be taken, all other action and do, or cause to be done, all other things
necessary, proper or appropriate to consummate and make effective the
transactions contemplated by this Agreement. If at any time after the Effective
Time any further action is necessary or desirable to carry out the purpose of
this Agreement, each party shall take all such necessary action.
 
     (b) Beacon and Beacon Partnership shall use all reasonable best efforts to
obtain from Coopers & Lybrand, LLP, access to all work papers relating to audits
of Beacon and Beacon Partnership performed by Coopers & Lybrand, LLP, and the
continued cooperation of Coopers & Lybrand, LLP, with regard to the preparation
of consolidated financial statements for the Surviving Trust.
 
     (c) Beacon and Beacon Partnership shall give prompt notice to EOP and EOP
Partnership, and EOP and EOP Partnership shall give prompt notice to Beacon and
Beacon Partnership, (i) if any representation or warranty made by it contained
in this Agreement that is qualified as to materiality becomes untrue or
inaccurate in any respect or any such representation or warranty that is not so
qualified becomes untrue or inaccurate in any material respect or (ii) of the
failure by it to comply with or satisfy in any material respect any covenant,
condition or agreement to be complied with or satisfied by it under this
Agreement; provided, however, that no such notification shall affect the
representations, warranties, covenants or agreements of the parties or the
conditions to the obligations of the parties under this Agreement.
 
                                       32
<PAGE>   421
 
     5.4  Tax Treatment. Each of EOP and Beacon shall use its reasonable best
efforts before and after the Effective Time to cause the Merger to qualify as a
reorganization under the provisions of Sections 368(a) of the Code and to obtain
the opinions of counsel referred to in Sections 6.2(e) nd 6.3(e). If, based upon
the advice of counsel, EOP and Beacon determine that the Partnership Merger
could reasonably be expected to create a risk that the Merger would not qualify
as a reorganization under the provisions of Section 368(a) of the Code, EOP and
Beacon undertake to use reasonable best efforts to negotiate and structure an
alternative means to effect the Merger, for EOP to acquire the interest in
Beacon Partnership owned by Beacon, and for the holders of Beacon OP Units to
receive EOP OP Units (or the economic and tax equivalent thereof) in exchange
for their Beacon OP Units. EOP Partnership will use the "traditional method"
under Treasury Regulations Section 1.704-3(b) for purposes of making allocations
under Section 704(c) of the Code with respect to the properties of or interests
in the Beacon Partnership as of the Effective Time (with no curative allocations
of gross income with respect to depreciation to offset the effects of the
"ceiling rule" but with a curative allocation of gain upon disposition of such
properties to offset the effect of the "ceiling rule"). EOP Partnership and
Beacon Partnership shall negotiate in good faith to agree upon the "Section
704(c) values" of the properties of Beacon Partnership, effective as of the
Closing Date. For purposes of allocating "excess nonrecourse liabilities" of the
EOP Partnership pursuant to Treasury Regulations Section 1.752-3(a)(3) following
the Closing Date, EOP Partnership shall use a methodology to be agreed upon
between EOP Partnership and Beacon Partnership.
 
     5.5  Public Announcements. Each party will consult with each other party
before issuing, and provide each other the opportunity to review and comment
upon, any press release or other written public statements which address in any
manner the transactions contemplated by this Agreement, and shall not issue any
such press release or make any such written public statement prior to such
consultation, except as may be required by applicable law, court process or by
obligations pursuant to any listing agreement with any national securities
exchange. The parties agree that the initial press release to be issued with
respect to the transactions contemplated by this Agreement will be in the form
agreed to by the parties prior to the execution of this Agreement.
 
     5.6  Listing. EOP shall use all reasonable best efforts to cause the EOP
Common Shares and the EOP Preferred Shares to be issued in the Merger and the
EOP Common Shares reserved for issuance upon redemption of EOP OP Units issued
in the Partnership Merger, to be approved for listing on the NYSE, subject to
official notice of issuance, prior to the Effective Time.
 
     5.7  Transfer and Gains Taxes. Each party shall cooperate in the
preparation, execution and filing of all returns, questionnaires, applications
or other documents regarding any real property transfer or gains, sales, use,
transfer, value added stock transfer and stamp taxes, any transfer, recording,
registration and other fees and any similar taxes which become payable in
connection with the transactions contemplated by this Agreement (together with
any related interests, penalties or additions to tax, "Transfer and Gains
Taxes"). From and after the Effective Time, EOP shall pay or cause EOP Operating
Partnership, as appropriate, to pay or cause to be paid, without deduction or
withholding from any amounts payable to the holders of EOP Common Shares and EOP
Preferred Shares, or EOP OP Units, as applicable, all Transfer and Gains Taxes
(which term shall not in any event be construed to include for these purposes
any tax imposed under the Code).
 
     5.8  Benefit Plans and Other Employee Arrangements.
 
     (a) Benefit Plans. After the Effective Time, all employees of Beacon who
are employed by the Surviving Trust shall, at the option of the Surviving Trust,
either continue to be eligible to participate in an "employee benefit plan", as
defined in Section 3(3) of ERISA, of Beacon which is, at the option of the
Surviving Trust, continued by the Surviving Trust, or alternatively shall be
eligible to participate in the same manner as other similarly situated employees
of the Surviving Trust who were formerly employees of EOP in any "employee
benefit plan," as defined in Section 3(3) of ERISA, sponsored or maintained by
the Surviving Trust after the Effective Time. With respect to each such employee
benefit plan, service with Beacon or any Beacon Subsidiary (as applicable) and
the predecessor of any of them shall be included for purposes of determining
eligibility to participate, vesting (if applicable) and entitlement to benefits.
 
                                       33
<PAGE>   422
 
     (b)  Stock Option Plan. The stock option plan of Beacon shall be
discontinued.
 
     (c)  Beacon Stock Options. As of the Effective Time, each outstanding
Beacon Stock Option shall vest and be immediately exercisable, be assumed by
EOP, and be deemed to constitute an option to acquire the same number of EOP
Common Shares as the holder of such Beacon Stock Option would have been entitled
to receive pursuant to the Merger had such holder exercised such Beacon Stock
Option in full immediately prior to the Effective Time at a price per share
equal to the aggregate exercise price for the Beacon Common Shares subject to
such Beacon Stock Option divided by the number of full EOP Common Shares deemed
to be purchasable pursuant to such Beacon Stock Option; provided, however,that
the number of EOP Common Shares that may be purchased upon exercise of such
Beacon Stock Option shall not include any fractional share and, upon the first
such exercise of such Beacon Stock Option, a cash payment shall be made for any
fractional share calculated in accordance with and in the manner provided for
calculations as to be paid in lieu of fractional shares as part of the Merger
Consideration under Section 1.10. All such Beacon Stock Options held by
directors and officers of Beacon above the office of Vice President shall remain
exercisable for one day after the Closing Date and shall expire at 11:59 p.m.,
New York time, on the next business day following the Closing Date and all such
Beacon Stock Options held by persons other than directors and officers of Beacon
above the office of Vice President shall expire on the six month anniversary of
the Closing Date if such person's employment terminates prior to or during such
six-month period and shall expire in accordance with the present terms of the
Beacon Stock Option if such person's employment does not terminate prior to or
during such six-month period; provided, however, that EOP shall use its
reasonable best efforts to enable each person who holds Beacon Stock Options as
of the Effective Time and who exercises (with no requirement to deliver funds or
withholding amounts until settlement) such Beacon Stock Options subsequent to
the Effective Time but prior to 11:59 p.m., New York time, on the next business
day following the Closing Date to receive (other than from EOP or any EOP
Subsidiary), within four (4) business days after the Effective Time, an amount
per Beacon Stock Option equal to the excess, if any, of (A) the closing price of
one EOP Common Share on the New York Stock Exchange (the "NYSE") on the next
business day following the Closing Date, over (B) the sum of (i) the exercise
price of such Beacon Stock Option divided by the Exchange Ratio plus (ii) with
respect to directors and officers of Beacon above the office of Vice President,
an amount equal to any reasonable and customary brokerage commissions payable
with respect to the sale of EOP Common Shares in connection with such option
exercise; and, if EOP is unsuccessful in enabling each such person to receive
such amount, then such Beacon Stock Option shall not expire prior to its stated
expiration date and EOP shall use its reasonable best efforts to make other
arrangements to enable each such person to receive the full economic benefit of
such amount (provided that neither EOP nor any EOP Subsidiary shall have any
obligation to pay to any such person any amount of cash or cash equivalents with
respect to his or her Beacon Stock Options).
 
     (d) Withholding. To the extent required by applicable law, Beacon shall
require each employee who exercises a Beacon Stock Option or who receives Beacon
Common Shares pursuant to any existing commitment to pay to Beacon in cash or
Beacon Common Shares an amount sufficient to satisfy in full Beacon's obligation
to withhold Taxes incurred by reason of such exercise or issuance.
 
     5.9  Indemnification.
 
     (a) From and after the Effective Time, EOP and EOP Partnership
(collectively, the "Indemnifying Parties") shall provide exculpation and
indemnification for each person who is now or has been at any time prior to the
date hereof or who becomes prior to the Effective Time, an officer or director
of Beacon or any Beacon Subsidiary (the "Indemnified Parties") which is the same
as the exculpation and indemnification provided to the Indemnified Parties by
Beacon and the Beacon Subsidiaries immediately prior to the Effective Time in
its charter, Bylaws or in its partnership, operating or similar agreement, as in
effect on the date hereof; provided, however, that such exculpation and
indemnification covers actions on or prior to the Effective Time, including,
without limitation, all transactions contemplated by this Agreement.
 
     (b) In addition to the rights provided in Section 5.9(a) above, in the
event of any threatened or actual claim, action, suit, proceeding or
investigation, whether civil, criminal or administrative, including without
limitation, any action by or on behalf of any or all security holders of Beacon
or EOP, or any Beacon
 
                                       34
<PAGE>   423
 
Subsidiary or EOP Subsidiary, or by or in the right of Beacon or EOP, or any
Beacon Subsidiary or EOP Subsidiary, or any claim, action, suit, proceeding or
investigation in which any person who is now, or has been, at any time prior to
the date hereof, or who becomes prior to the Effective Time, an officer,
employee or director of Beacon or any Beacon Subsidiary (the "Indemnification
Parties") is, or is threatened to be, made a party based in whole or in part on,
or arising in whole or in part out of, or pertaining to (i) the fact that he is
or was an officer, employee or director of Beacon or any of the Beacon
Subsidiaries or any action or omission by such person in his capacity as a
director, or (ii) this Agreement or the transactions contemplated by this
Agreement, whether in any case asserted or arising before or after the Effective
Time, EOP, Beacon and the Indemnified Parties, hereby agree to use their
reasonable best efforts to cooperate in the defense of such claim, action, suit,
proceeding or investigation. The Indemnified Parties shall have the right to
select counsel, subject to the consent of the Indemnifying Parties (which
consent shall not be unreasonably withheld or delayed). It is understood and
agreed that, after the Effective Time, the Indemnifying Parties shall indemnify
and hold harmless, as and to the full extent permitted by applicable law, each
Indemnified Party against any losses, claims, liabilities, expenses (including
reasonable attorneys' fees and expenses), judgments, fines and amounts paid in
settlement in accordance herewith in connection with any such threatened or
actual claim, action, suit, proceeding or investigation. In addition, after the
Effective Time, in the event of any such threatened or actual claim, action,
suit, proceeding or investigation, the Indemnifying Parties shall promptly pay
and advance reasonable expenses and costs incurred by each Indemnified Person as
they become due and payable in advance of the final disposition of the claim,
action, suit, proceeding or investigation to the fullest extent and in the
manner permitted by law. Notwithstanding the foregoing, the Indemnifying Parties
shall not be obligated to advance any expenses or costs prior to receipt of an
undertaking by or on behalf of the Indemnified Party to repay any expenses
advanced if it shall ultimately be determined that the Indemnified Party is not
entitled to be indemnified against such expense. Notwithstanding anything to the
contrary set forth in this Agreement, the Indemnifying Parties (i) shall not be
liable for any settlement affected without their prior written consent, and (ii)
shall not have any obligation hereunder to any Indemnified Party to the extent
that a court of competent jurisdiction shall determine in a final and
non-appealable order that such indemnification is prohibited by applicable law.
In the event of a final and non-appealable determination by a court that any
payment of expenses is prohibited by applicable law, the Indemnified Person
shall promptly refund to the Indemnifying Parties the amount of all such
expenses theretofore advanced pursuant hereto. Any Indemnified Party wishing to
claim indemnification under this Section 5.9, upon learning of any such claim,
action, suit, proceeding or investigation, shall promptly notify the
Indemnifying Parties of such claim and the relevant facts and circumstances with
respect thereto; provided, however, that the failure to provide such notice
shall not affect the obligations of EOP except to the extent such failure to
notify materially prejudices the Indemnifying Parties ability to defend such
claim, action, suit, proceeding or investigation; and provided, further,
however, that no Indemnified Party shall be obligated to provide any
notification pursuant to this Section 5.9(b) prior to the Effective Time.
 
     (c) At or prior to the Effective Time, EOP shall purchase directors'
liability insurance policy coverage for Beacon's executive officers for a period
of six years which will provide the directors and officers with coverage on
substantially similar terms as currently provided by Beacon to such directors
and officers. Beacon shall have the right to reasonably review and approve any
such policy, which approval shall not be unreasonably withheld.
 
     (d) This Section 5.9 is intended for the irrevocable benefit of, and to
grant third party rights to, the Indemnified Parties and their successors,
assigns and heirs and shall be binding on all successors and assigns of EOP.
Each of the Indemnified Parties shall be entitled to enforce the covenants
contained in this Section 5.9 and EOP acknowledges and agrees that each
Indemnified Party would suffer irreparable harm and that no adequate remedy at
law exists for a breach of such covenants and such Indemnified Party shall be
entitled to injunctive relief and specific performance in the event of any
breach of any provision in this Section.
 
     (e) In the event that the Surviving Trust or any of its respective
successors or assigns (i) consolidates with or merges into any other person and
shall not be the continuing or surviving corporation or entity of such
consolidation or merger or (ii) transfers all or substantially all of its
properties and assets to any person, then, and in each such case the successors
and assigns of such entity shall assume the obligations set forth in this
 
                                       35
<PAGE>   424
 
Section 5.9, which obligations are expressly intended to be for the irrevocable
benefit of, and shall be enforceable by, each director and officer covered
hereby.
 
     5.10 Declaration of Dividends and Distributions. From and after the date of
this Agreement, neither Beacon nor EOP shall make any dividend or distribution
to its shareholders without the prior written consent of the other party;
provided, however, the written consent of the other party shall not be required
for the authorization and payment of quarterly distributions with respect to the
Beacon Common Shares or EOP Common Shares for the dividend for the third quarter
of 1997 and for each quarterly dividend thereafter in an amount up to the
dividend per share paid by it for the second quarter of 1997 (provided that, for
purposes of this Section 5.10 only, EOP's dividend per share paid by it for the
second quarter of 1997 shall be deemed to be $.30); provided, however, the
record date for each distribution with respect to the Beacon Common Shares shall
be the same date as the record date for the quarterly distribution for the EOP
Common Shares as provided to Beacon by notice not less than twenty (20) business
days prior to the record date for any quarterly EOP distribution. From and after
the date of this Agreement, Beacon Partnership shall not make any distribution
to the holders of Beacon OP Units except a distribution per Beacon OP Unit in
the same amount as a dividend per Beacon Common Share permitted pursuant to this
Section, with the same record and payment dates as such dividend on the Beacon
Common Shares. The foregoing restrictions shall not apply, however, to the
extent a distribution by Beacon or EOP is necessary for Beacon or EOP, as
applicable, to maintain REIT status.
 
     5.11 Transfer of Management Company Shares. At the Closing and pursuant to
the Stock Purchase Agreements, each of the holders of voting capital stock of
the Management Company, Design Company and Construction Company (other than
Beacon Partnership, to the extent it owns any such voting capital stock) shall
transfer to EOP Management Corp. or such person or persons as EOP Management
Corp. shall designate by written notice delivered to them prior to the Closing,
all of the shares of each such Company owned by them, constituting all the
outstanding shares of such companies which are not owned by Beacon Partnership,
for an aggregate consideration in an amount equal to the fair market value of
such shares, as determined in accordance with the provisions of the Stock
Purchase Agreements.
 
     5.12 Notices. EOP shall provide such notice to its preferred shareholders
of the Merger as is required under Maryland law.
 
     5.13 Resignations. On the Closing Date, Beacon shall cause the directors
and officers of each of the Beacon Subsidiaries to submit their resignations
from such positions, effective as of the Effective Time.
 
     5.14 Third Party Management Agreements. Beacon will not, and will not
permit any of its Subsidiaries to, amend the management agreements pursuant to
which Beacon, directly or indirectly, manages buildings in which Beacon does not
own a 100% interest. Beacon will not, and will not permit any Beacon Subsidiary
to, renew such management agreements except on terms which permit its
cancellation by Beacon or the applicable Beacon Subsidiary on thirty days'
notice or less without any charge, penalty or other cost for such cancellation.
 
     5.15 Existing Restrictions on Resale of Certain Beacon Properties. EOP and
EOP Partnership shall assume the obligations of Beacon, Beacon Partnership or
the applicable Beacon Subsidiary, as the case may be, under the Tax Protection
Agreements described in Schedule 2.18(j) to the Beacon Disclosure Letter.
 
     5.16 Agreement to Hold Certain Properties and Maintain Certain
Indebtedness. EOP and EOP Partnership will enter into agreements with Beacon and
Beacon Partnership, for the benefit of and enforceable by the individuals and
entities set forth in Schedule 5.16 hereto, implementing the principal terms set
forth in Schedule 5.16 hereto, the purpose of which is to permit the individuals
and entities set forth in Schedule 5.16 hereto to defer the recognition of gain
for federal income tax purposes that otherwise would be recognized if certain
properties were to be sold and/or certain outstanding loans were to be repaid.
EOP, EOP Partnership, Beacon and Beacon Partnership agree to negotiate in good
faith the specific provisions of such agreements consistent with the principal
terms set forth in Schedule 5.16 hereto and enter into such agreements prior to
the Closing Date.
 
                                       36
<PAGE>   425
 
     5.17 RWLP Corp. If requested by EOP Management Corp., Beacon and Beacon
Partnership shall use their reasonable best efforts to (a) cause RWLP Corp. to
sell its interest in Rowes Wharf Limited Partnership to Design Corp.,
Construction Corp. or such other person as may be designated by EOP Management
Corp. for the fair market value thereof at or within two (2) years after the
Effective Time; (b) cause the stockholders of RWLP Corp. to sell all of their
stock of RWLP Corp. to Design Corp., Construction Corp. or such other person as
may be designated by EOP Management Corp. for the fair market value thereof at
or within two (2) years after the Effective Time; and (c) take such other
actions in connection with RWLP Corp. as EOP Management Corp. reasonably may
request, including, without limitation, converting the general partner interest
of RWLP Corp. in Rowes Wharf Limited Partnership into a limited partnership
interest and consenting to the substitution of Design Corp., Construction Corp.,
or such other person as may be designated by EOP Management Corp., as a general
partner of Rowes Wharf Limited Partnership.
 
                                   ARTICLE 6
 
                                   CONDITIONS
 
     6.1 Conditions to Each Party's Obligation to Effect the Merger. The
obligations of each party to effect the Mergers and to consummate the other
transactions contemplated by this Agreement to occur on the Closing Date shall
be subject to the fulfillment at or prior to the Closing Date of the following
conditions:
 
          (a) Shareholder and Partner Approvals. This Agreement, the Mergers and
     all other matters necessary to consummate the other transactions
     contemplated to occur on the Closing Date and the transactions contemplated
     by this Agreement shall have been approved and adopted by the Shareholder
     Approvals and all required Partner Approvals shall have been obtained.
 
          (b) HSR Act. The waiting period (and any extension thereof) applicable
     to the Partnership Merger, the Merger and the transactions contemplated by
     the Stock Purchase Agreements under the HSR Act, if applicable to the
     Partnership Merger, the Merger and the transactions contemplated by the
     Stock Purchase Agreements, shall have expired or been terminated.
 
          (c) Listing of Shares. The NYSE shall have approved for listing the
     EOP Common Shares and the EOP Preferred Shares to be issued in the Merger
     and the EOP Common Shares reserved for issuance upon redemption of EOP OP
     Units issued in the Partnership Merger, subject to official notice of
     issuance.
 
          (d) Registration Statement. The Registration Statement shall have
     become effective under the Securities Act and shall not be the subject of
     any stop order or proceedings by the SEC seeking a stop order.
 
          (e) No Injunctions or Restraints. No temporary restraining order,
     preliminary or permanent injunction or other order issued by any court of
     competent jurisdiction or other legal restraint or prohibition preventing
     the consummation of the Mergers or any of the other transactions
     contemplated hereby shall be in effect.
 
          (f) Blue Sky Laws. EOP shall have received all state securities or
     "blue sky" permits and other authorizations necessary to issue the EOP
     Common Shares, EOP Preferred Shares and EOP OP Units issuable in the
     Mergers.
 
     6.2 Conditions to Obligations of EOP and EOP Partnership. The obligations
of EOP and EOP Partnership to effect the Mergers and to consummate the other
transactions contemplated to occur on the Closing Date are further subject to
the following conditions, any one or more of which may be waived by EOP:
 
          (a) Representations and Warranties. The representations and warranties
     of Beacon and Beacon Partnership set forth in this Agreement shall be true
     and correct in all material respects as of the date of this Agreement and
     as of the Closing Date, as though made on and as of the Closing Date,
     except to the extent such representation or warranty is expressly limited
     by its terms to another date, and EOP shall have received a certificate
     (which certificate may be qualified by Knowledge to the same extent as the
 
                                       37
<PAGE>   426
 
     representations and warranties of Beacon and Beacon Partnership contained
     herein are so qualified) signed on behalf of Beacon by the chief executive
     officer or the chief financial officer of Beacon, in such capacity, to such
     effect.
 
          (b) Performance of Obligations of Beacon and Beacon
     Partnership. Beacon and Beacon Partnership shall have performed in all
     material respects all obligations required to be performed by them under
     this Agreement at or prior to the Effective Time, and EOP shall have
     received a certificate signed on behalf of Beacon by the chief executive
     officer or the chief operating officer of Beacon, in such capacity, to such
     effect.
 
          (c) Material Adverse Change. Since the date of this Agreement, there
     shall have been no Beacon Material Adverse Change and EOP shall have
     received a certificate of the chief executive officer or chief operating
     officer of Beacon, in such capacity, certifying to such effect.
 
          (d) Tax Opinions Relating to REIT Status and Partnership Status. EOP
     shall have received (i) an opinion of Goodwin, Procter & Hoar LLP or other
     counsel to Beacon reasonably satisfactory to EOP, dated as of the Closing
     Date, to the effect that, commencing with its taxable year ended December
     31, 1994, (x) Beacon was organized and has operated in conformity with the
     requirements for qualification as a REIT under the Code, and (y) Beacon
     Partnership has been during and since 1994, and continues to be, treated
     for federal income tax purposes as a partnership and not as a corporation
     or association taxable as a corporation (with customary exceptions,
     assumptions and qualifications and based upon customary representations)
     and (ii) an opinion of Hogan & Hartson L.L.P. or other counsel to EOP
     reasonably satisfactory to Beacon, dated as of the Closing Date, to the
     effect that, commencing with its taxable year ending December 31, 1997, EOP
     was organized and has operated in conformity with the requirements for
     qualification as a REIT under the Code and that, after giving effect to the
     Merger, EOP's proposed method of operation will enable it to continue to
     meet the requirements for qualification and taxation as a REIT under the
     Code (with customary exceptions, assumptions and qualifications and based
     upon customary representations and based upon and subject to the opinion of
     counsel to Beacon described in clause (i) above).
 
          (e) Tax Opinion Relating to Merger. EOP shall have received an opinion
     dated the Closing Date from Hogan & Hartson L.L.P., Sullivan & Cromwell or
     other counsel reasonably satisfactory to EOP, based upon customary
     certificates and letters, which letters and certificates are to be in a
     form to be agreed upon by the parties and dated the Closing Date, to the
     effect that the Merger will qualify as a reorganization under the
     provisions of Section 368(a) of the Code.
 
          (f) Consents. All consents and waivers (including, without limitation,
     waivers of rights of first refusal) from third parties necessary in
     connection with the consummation of the transactions contemplated by this
     Agreement shall have been obtained, other than such consents and waivers
     from third parties, which, if not obtained, would not result, individually
     or in the aggregate, in an EOP Material Adverse Effect or a Beacon Material
     Adverse Effect.
 
          (g) "Comfort" Letter. EOP and EOP Partnership shall have received a
     "comfort" letter from Coopers & Lybrand, LLP, as described in Section
     5.1(b).
 
          (h) Shares of the Management, Design and Construction Companies. All
     of the voting shares of the Management Company, the Design Company and the
     Construction Company (other than any such shares owned by Beacon
     Partnership) shall have been transferred to EOP Management Corp., or its
     designees or assigns, in accordance with the Stock Purchase Agreements.
 
     6.3 Conditions to Obligations of Beacon and Beacon Partnership. The
obligations of Beacon and Beacon Partnership to effect the Mergers and to
consummate the other transactions contemplated to occur on the Closing Date is
further subject to the following conditions, any one or more of which may be
waived by Beacon:
 
          (a) Representations and Warranties. The representations and warranties
     of EOP and EOP Partnership set forth in this Agreement shall be true and
     correct in all material respects as of the date of this
 
                                       38
<PAGE>   427
 
     Agreement and as of the Closing Date, as though made on and as of the
     Closing Date, except to the extent the representation or warranty is
     expressly limited by its terms to another date, and Beacon shall have
     received a certificate (which certificate may be qualified by Knowledge to
     the same extent as such representations and warranties of EOP and EOP
     Partnership contained herein are so qualified) signed on behalf of EOP by
     the chief executive officer or the chief financial officer of such party,
     in such capacity, to such effect.
 
          (b) Performance of Obligations of EOP and EOP Partnership. EOP and EOP
     Partnership shall have performed in all material respects all obligations
     required to be performed by it under this Agreement at or prior to the
     Effective Time, and Beacon shall have received a certificate of EOP signed
     on behalf of EOP by the chief executive officer or the chief financial
     officer of EOP, in such capacity, to such effect.
 
          (c) Material Adverse Change. Since the date of this Agreement, there
     shall have been no EOP Material Adverse Change and Beacon shall have
     received a certificate of the chief executive officer or chief financial
     officer of EOP, in such capacity, certifying to such effect.
 
          (d) Tax Opinions Relating to REIT Status and Partnership
     Status. Beacon shall have received an opinion of Hogan & Hartson L.L.P. or
     other counsel to EOP, reasonably satisfactory to Beacon, dated as of the
     Closing Date, that, commencing with its taxable year ended December 31,
     1997, (i) EOP was organized and has operated in conformity with the
     requirements for qualification as a REIT under the Code and (ii) EOP
     Operating Partnership has been during and since 1997, and continues to be,
     treated for federal income tax purposes as a partnership and not as a
     corporation or association taxable as a corporation (with customary
     exceptions, assumptions and qualifications and based upon customary
     representations).
 
          (e) Tax Opinion Relating to Merger. Beacon shall have received an
     opinion dated the Closing Date from Goodwin, Procter & Hoar LLP, Sullivan &
     Cromwell or other counsel reasonably satisfactory to Beacon, based upon
     customary certificates and letters, which letters and certificates are to
     be in a form to be agreed upon by the parties and dated the Closing Date,
     to the effect that the Merger will qualify as a reorganization under the
     provisions of Section 368(a) of the Code.
 
          (f) Consents. All consents and waivers (including, without limitation,
     waivers or rights of first refusal) from third parties necessary in
     connection with the consummation of the transactions contemplated hereby
     shall have been obtained, other than such consents and waivers from third
     parties, which, if not obtained, would not result, individually or in the
     aggregate, in an EOP Material Adverse Effect or a Beacon Material Adverse
     Effect.
 
          (g) "Comfort" Letter. Beacon and Beacon Partnership shall have
     received a "comfort" letter from Ernst & Young LLP, as described in Section
     5.1(b).
 
                                   ARTICLE 7
 
                       TERMINATION, AMENDMENT AND WAIVER
 
     7.1 Termination. This Agreement may be terminated at any time prior to the
filing of the Articles of Merger with the Department, whether before or after
either of the Shareholder Approvals or the Beacon Unitholder Approvals are
obtained:
 
          (a) by mutual written consent duly authorized by the Board of Trustees
     of EOP and the Board of Directors of Beacon;
 
          (b) by EOP, upon a breach of any representation, warranty, covenant,
     obligation or agreement on the part of Beacon or Beacon Partnership set
     forth in this Agreement, or if any representation or warranty of Beacon or
     Beacon Partnership shall become untrue, in either case such that the
     conditions set forth in Section 6.2(a) or Section 6.2(b), as the case may
     be, would be incapable of being satisfied by April 15, 1998 (or as
     otherwise extended);
 
                                       39
<PAGE>   428
 
          (c) by Beacon, upon a breach of any representation, warranty, covenant
     obligation or agreement on the part of EOP or EOP Partnership set forth in
     this Agreement, or if any representation or warranty of EOP or EOP
     Partnership shall become untrue, in either case such that the conditions
     set forth in Section 6.3(a) or Section 6.3(b), as the case may be, would be
     incapable of being satisfied by April 15, 1998 (or as otherwise extended);
 
          (d) by either EOP or Beacon, if any judgment, injunction, order,
     decree or action by any Governmental Entity of competent authority
     preventing the consummation of the Merger shall have become final and
     non-appealable;
 
          (e) by either EOP or Beacon, if the Merger shall not have been
     consummated before April 15, 1998; provided, however, that a party may not
     terminate pursuant to this clause (e) if the terminating party shall have
     breached in any material respect its obligations under this Agreement in
     any manner that shall have proximately contributed to the occurrence of the
     failure referred to in this clause;
 
          (f) by either EOP or Beacon (unless Beacon or Beacon Partnership is in
     breach of its obligations under Section 5.1) if, upon a vote at a duly held
     Beacon Shareholders Meeting or any adjournment thereof, the Beacon
     Shareholder Approvals shall not have been obtained as contemplated by
     Section 5.1 (excluding Section 5.1(d));
 
          (g) by either Beacon or EOP (unless EOP or EOP Partnership is in
     breach of its obligations under Section 5.1 (excluding Section 5.1(d)) if,
     upon a vote at a duly held EOP Shareholders Meeting or any adjournment
     thereof, the EOP Shareholder Approvals shall not have been obtained as
     contemplated by Section 5.1 (excluding Section 5.1(d));
 
          (h) by Beacon, if prior to the Beacon Shareholders Meeting, the Board
     of Directors of Beacon shall have withdrawn or modified in any manner
     adverse to EOP its approval or recommendation of the Merger or this
     Agreement in connection with, or approved or recommended, a Superior
     Acquisition Proposal; provided, however, that such termination shall not be
     effective prior to the payment of the Break-Up Fee to the extent required
     by Section 7.2;
 
          (i) by EOP, if (A) prior to the Beacon Shareholders Meeting, the Board
     of Directors of Beacon shall have withdrawn or modified in any manner
     adverse to EOP its approval or recommendation of the Merger or this
     Agreement in connection with, or approved or recommended, any Superior
     Acquisition Proposal, (B) Beacon shall have entered into any agreement for
     any Acquisition Proposal, or (C) the Board of Directors of Beacon or any
     committee thereof shall have resolved to do any of the foregoing; and
 
          (j) by Beacon at any time during the seven (7) trading day period
     following the Pricing Period (as defined below) if the Average Closing
     Price (as defined below) shall be less than Twenty-Seven Dollars and
     Thirty-Nine Cents ($27.39). If Beacon elects to exercise its termination
     right pursuant to this Section 7.1(j), it shall give written notice to EOP
     (provided that such notice of election to terminate may be withdrawn at any
     time within the aforementioned seven (7) trading day period). For purposes
     of this Section 7.1(j), (i) the term "Average Closing Price" means the
     average of the closing prices of EOP Common Stock, on the New York Stock
     Exchange for all trading days during the Pricing Period, and (ii) "Pricing
     Period" means the period of twenty (20) consecutive trading days commencing
     on the twenty-seventh (27th) trading day prior to the date of the Beacon
     Shareholders Meeting.
 
     7.2 Certain Fees and Expenses. If this Agreement shall be terminated (i)
pursuant to Section 7.1(h) or 7.1(i), then Beacon and Beacon Partnership
thereupon shall pay to EOP Partnership (provided that Beacon was not entitled to
terminate this Agreement pursuant to Section 7.1(c) at the time of such
termination) a fee equal to the Break-Up Fee (as defined below), and (ii)
pursuant to Section 7.1(b) (subject to the proviso in the final sentence of
Section 2.8) or 7.1(f), then Beacon and Beacon Partnership shall pay to EOP
Partnership (provided that Beacon was not entitled to terminate this Agreement
pursuant to Section 7.1(c) at the time of such termination) an amount equal to
the Break-Up Expenses (as defined below). If this Agreement shall be terminated
pursuant to Section 7.1(c) or 7.1(g), then EOP and EOP Partnership shall pay
Beacon Partnership (provided that EOP was not entitled to terminate this
Agreement pursuant to Section 7.1(b) at the time of such termination) an amount
equal to the Break-Up Expenses. If this Agreement shall be
 
                                       40
<PAGE>   429
 
terminated pursuant to Section 7.1(b), 7.1(d) (if primarily resulting from any
action or inaction of Beacon or any Beacon Subsidiary), 7.1(e), 7.1(f) or 7.1(j)
and prior to the time of such termination an Acquisition Proposal has been
received by Beacon or any Beacon Subsidiary, and either prior to the termination
of this Agreement or within twelve (12) months thereafter, Beacon or any Beacon
Subsidiary enters into any written Acquisition Proposal which is subsequently
consummated (whether or not any such Acquisition Proposal is the same
Acquisition Proposal which had been received at the time of the termination of
this Agreement), then Beacon and Beacon Partnership shall pay the Break-Up Fee
to EOP Partnership. If prior to the Beacon Shareholders Meeting the Board of
Directors of Beacon shall have withdrawn or modified in any manner adverse to
EOP its approval or recommendation of the Merger or this Agreement and, within
twelve (12) months after termination of this Agreement, Beacon or Beacon
Partnership enters into any written Acquisition Proposal which is subsequently
consummated (whether or not any Acquisition Proposal had been received prior to
the time of the termination of this Agreement), then Beacon and Beacon
Partnership shall pay the Break-Up Fee to EOP Partnership. If this Agreement
shall be terminated pursuant to Section 7.1(j) and within six (6) months
thereafter, Beacon or any Beacon Subsidiary enters into any written Acquisition
Proposal which is subsequently consummated (whether or not any Acquisition
Proposal had been received at the time of the termination of this Agreement),
then Beacon and Beacon Partnership shall pay the Break-Up Fee to EOP
Partnership. The payment of the Break-Up Fee shall be compensation for the loss
suffered by EOP and EOP Partnership as a result of the failure of the Mergers to
be consummated (including, without limitation, opportunity costs and
out-of-pocket costs and expenses) and to avoid the difficulty of determining
damages under the circumstances. The Break-Up Fee shall be paid by Beacon and
Beacon Partnership to EOP Partnership, or the Break-Up Expenses shall be paid by
Beacon and Beacon Partnership to EOP Partnership or EOP Partnership to Beacon
Partnership (as applicable), in immediately available funds within fifteen (15)
calendar days after the date the event giving rise to the obligation to make
such payment occurred (except as otherwise provided in Section 7.1(h)). As used
in this Agreement, "Break-Up Fee" shall be an amount equal to the lesser of (i)
$75,000,000 less Break-Up Expenses paid or payable under this Section 7.2 (the
"Base Amount") and (ii) the sum of (A) the maximum amount that can be paid to
EOP Partnership without causing EOP to fail to meet the requirements of Sections
856(c)(2) and (3) of the Code determined as if the payment of such amount did
not constitute income described in Sections 856(c)(2)(A)-(H) and
856(c)(3)(A)-(I) of the Code ("Qualifying Income"), as determined by independent
accountants to EOP, and (B) in the event EOP receives a letter from outside
counsel (the "Break-Up Fee Tax Opinion") indicating that EOP has received a
ruling from the IRS holding that EOP Partnership's receipt of the Base Amount
would either constitute Qualifying Income or would be excluded from gross income
of EOP within the meaning of Sections 856(c)(2) and (3) of the Code (the "REIT
Requirements") or that the receipt by EOP Partnership of the remaining balance
of the Base Amount following the receipt of and pursuant to such ruling would
not be deemed constructively received prior thereto, the Base Amount less the
amount payable under clause (A) above. Beacon's and Beacon Partnership's
obligation to pay any unpaid portion of the Break-Up Fee shall terminate three
years from the date of this Agreement. In the event that EOP Partnership is not
able to receive the full Base Amount, Beacon and Beacon Partnership shall place
the unpaid amount in escrow and shall not release any portion thereof to EOP
Partnership unless and until Beacon receives either one of the following: (i) a
letter from EOP's independent accountants indicating the maximum amount that can
be paid at that time to EOP Partnership without causing EOP to fail to meet the
REIT Requirements or (ii) a Break-Up Fee Tax Opinion, in either of which events
Beacon and Beacon Partnership shall pay to EOP Partnership the lesser of the
unpaid Base Amount or the maximum amount stated in the letter referred to in (i)
above. The "Break-Up Expenses" payable to EOP Partnership or Beacon Partnership,
as the case may be (the "Recipient"), shall be an amount equal to the lesser of
(i) $10,000,000, (ii) the Recipient's out-of-pocket expenses incurred in
connection with this Agreement and the transactions contemplated hereby
(including, without limitation, all attorneys', accountants' and investment
bankers' fees and expenses) or (iii) the sum of (A) the maximum amount that can
be paid to the Recipient without causing EOP or Beacon, as the case may be, to
fail to meet the requirements of Sections 856(c)(2) and (3) of the Code
determined as if the payment of such amount did not constitute Qualifying
Income, as determined by independent accountants to the EOP or Beacon, as the
case may be, and (B) in the event EOP or Beacon, as the case may be, receives a
Break-Up Fee Tax Opinion indicating that it has received a ruling from the IRS
holding that the Recipient's receipt of the Break-Up Expenses would either
constitute Qualifying Income or would be excluded from gross income of
 
                                       41
<PAGE>   430
 
EOP or Beacon, as the case may be, within the meaning of the REIT Requirements
or that receipt by the Recipient of the remaining balance of the Break-Up
Expenses following the receipt of and pursuant to such ruling would not be
deemed constructively received prior thereto, the Break-Up Expenses less the
amount payable under clause (A) above. The obligation of EOP and EOP Partnership
or Beacon and Beacon Partnership, as applicable ("Payor"), to pay any unpaid
portion of the Break-Up Expenses shall terminate three years from the date of
this Agreement. In the event that the Recipient is not able to receive the full
Break-Up Expenses, the Payor shall place the unpaid amount in escrow and shall
not release any portion thereof to the Recipient unless and until the Payor
receives either one of the following: (i) a letter from the independent
accountants of EOP or Beacon, as the case may be, indicating the maximum amount
that can be paid at that time to the Recipient without causing it to fail to
meet the REIT Requirements or (ii) a Break-Up Expense Tax Opinion, in either of
which events the Payor shall pay to the Recipient the lesser of the unpaid
Break-Up Expenses or the maximum amount stated in the letter referred to in (i)
above.
 
     7.3 Effect of Termination. In the event of termination of this Agreement by
either Beacon or EOP as provided in Section 7.1, this Agreement shall forthwith
become void and have no effect, without any liability or obligation on the part
of EOP, EOP Partnership, Beacon or Beacon Partnership, other than the last
sentence of Section 5.2, Section 7.2, this Section 7.3 and Article 8, and except
to the extent that such termination results from a material breach by any party
of any of its representations, warranties, covenants or agreements set forth in
this Agreement.
 
     7.4 Amendment. This Agreement may be amended by the parties in writing by
action of the respective Board of Trustees or Board of Directors of EOP and
Beacon at any time before or after any Shareholder Approvals are obtained and
prior to the filing of the Articles of Merger with the Department; provided,
however, that, after the Shareholder Approvals and Partner Approvals are
obtained, no such amendment, modification or supplement shall be made which by
law requires the further approval of shareholders without obtaining such further
approval. The parties agree to amend this Agreement in the manner provided in
the immediately preceding sentence to the extent required to (a) continue the
status of each party as a REIT or (b) preserve the Merger as a tax-free
reorganization under Section 368 of the Code.
 
     7.5 Extension; Waiver. At any time prior to the Effective Time, the parties
may (a) extend the time for the performance of any of the obligations or other
acts of the other party, (b) waive any inaccuracies in the representations and
warranties of the other party contained in this Agreement or in any document
delivered pursuant to this Agreement or (c) subject to the proviso of Section
7.4, waive compliance with any of the agreements or conditions of the other
party contained in this Agreement. Any agreement on the part of a party to any
such extension or waiver shall be valid only if set forth in an instrument in
writing signed on behalf of such party. The failure of any party to this
Agreement to assert any of its rights under this Agreement or otherwise shall
not constitute a waiver of those rights.
 
                                   ARTICLE 8
 
                               GENERAL PROVISIONS
 
     8.1 Nonsurvival of Representations and Warranties. None of the
representations and warranties in this Agreement or in any instrument delivered
pursuant to this Agreement confirming the representations and warranties in this
Agreement shall survive the Effective Time. This Section 8.1 shall not limit any
covenant or agreement of the parties which by its terms contemplates performance
after the Effective Time.
 
     8.2 Notices. All notices, requests, claims, demands and other
communications under this Agreement shall be in writing and shall be delivered
personally, sent by overnight courier (providing proof of delivery) to
 
                                       42
<PAGE>   431
 
the parties or sent by telecopy (providing confirmation of transmission) at the
following addresses or telecopy numbers (or at such other address or telecopy
number for a party as shall be specified by like notice):
 
        (a) if to EOP, to:
 
              Equity Office Properties Trust
               Two North Riverside Plaza, 22nd Floor
               Chicago, Illinois 60606
               Attention: Timothy H. Callahan, President
                          Stanley M. Stevens, Chief Counsel
               Fax No.: (312) 559-5021
 
           with a copy to:
 
              Hogan & Hartson L.L.P.
               555 Thirteenth Street, N.W.
               Washington, D.C. 20004-1109
               Attention: J. Warren Gorrell, Jr., Esq.
                          James E. Showen, Esq.
               Fax No.: (202) 637-5910
 
        (b) if to Beacon, to:
 
              Beacon Properties Corporation
               50 Rowes Wharf
               Boston, Massachusetts 02110
               Attention: President
               Fax.: (617) 251-0151
 
           with a copy to:
 
              Goodwin Procter & Hoar LLP
               Exchange Place
               Boston, Massachusetts 02109
               Attention: Gilbert G. Menna, P.C.
                          Kathryn I. Murtagh, Esq.
               Fax No.: (617) 523-1231
 
     All notices shall be deemed given only when actually received.
 
     8.3 Interpretation. When a reference is made in this Agreement to a
Section, such reference shall be to a Section of this Agreement unless otherwise
indicated. The table of contents and headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Whenever the words "include", "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation."
 
     8.4 Counterparts. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other party.
 
     8.5 Entire Agreement; No Third-Party Beneficiaries. This Agreement, the
Beacon Disclosure Letter, the EOP Disclosure Letter, the Confidentiality
Agreement, the Voting Agreements and the other agreements entered into in
connection with the Mergers (a) constitute the entire agreement and supersede
all prior agreements and understandings, both written and oral (including,
without limitation, in connection with the form of this Agreement executed on
September 15, 1997) between the parties with respect to the subject matter of
this Agreement and (b) except as provided in Section 1.7, 1.11, 5.8, 5.9, 5.15,
5.16, and 8.10 ("Third Party Provisions"), are not intended to confer upon any
person other than the parties hereto any rights or remedies. The Third Party
Provisions may be enforced by the beneficiaries thereof or on behalf of the
 
                                       43
<PAGE>   432
 
beneficiaries thereof by the directors of Beacon who had been members of the
Board of Directors of Beacon prior to the Effective Time.
 
     8.6 Governing Law. THE PARTNERSHIP MERGER SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, REGARDLESS OF
THE LAWS THAT MIGHT OTHERWISE GOVERN UNDER APPLICABLE PRINCIPLES OF CONFLICT OF
LAWS THEREOF. EXCEPT AS PROVIDED IN THE IMMEDIATELY PRECEDING SENTENCE, THIS
AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF
THE STATE OF MARYLAND, REGARDLESS OF THE LAWS THAT MIGHT OTHERWISE GOVERN UNDER
APPLICABLE PRINCIPLES OF CONFLICT OF LAWS THEREOF.
 
     8.7 Assignment. Neither this Agreement nor any of the rights, interests or
obligations under this Agreement shall be assigned or delegated, in whole or in
part, by operation of law or otherwise by any of the parties without the prior
written consent of the other parties. Subject to the preceding sentence, this
Agreement will be binding upon, inure to the benefit of, and be enforceable by,
the parties and their respective successors and assigns.
 
     8.8 Enforcement. The parties agree that irreparable damage would occur in
the event that any of the provisions of this Agreement were not performed in
accordance with their specific terms or were otherwise breached. It is
accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any federal court located in
Maryland or in any state court located in Maryland this being in addition to any
other remedy to which they are entitled at law or in equity. In addition, each
of the parties hereto (a) consents to submit itself (without making such
submission exclusive) to the personal jurisdiction of any federal court located
in Maryland or any state court located in Maryland in the event any dispute
arises out of this Agreement or any of the transactions contemplated by this
Agreement and (b) agrees that it will not attempt to deny or defeat such
personal jurisdiction by motion or other request for leave from any such court.
 
     8.9 Severability. Any term or provision of this Agreement which is invalid
or unenforceable in any jurisdiction shall, as to that jurisdiction, be
ineffective to the extent of such invalidity or unenforceability without
rendering invalid or unenforceable the remaining terms and provisions of this
Agreement or affecting the validity or enforceability of any of the terms or
provisions of this Agreement in any other jurisdiction. If any provision of this
Agreement is so broad as to be unenforceable, the provision shall be interpreted
to be only so broad as is enforceable.
 
     8.10 EOP Extension Option. Notwithstanding anything to the contrary in
Sections 5.1(c), 7.1(b) or 7.1(e), in the event of any preliminary, temporary or
other nonfinal judgment, injunction, order, decree or action by any court (each
an "Action") preventing, delaying or otherwise materially adversely affecting
the consummation of either of the Mergers primarily resulting from any action or
inaction of Beacon, EOP shall have the right, in its sole and absolute
discretion, by giving written notice to Beacon, to preclude Beacon (for one or
more periods aggregating not more than six (6) months) from terminating this
Agreement pursuant to Section 7.1(e) or 7.1(h) (unless, in the case of Section
7.1(h), the Board of Directors of Beacon shall have acted in the circumstances
described in Section 7.1(h) without basing its decision in any way, directly or
indirectly, on the Action), for the period of such prevention, delay or material
adverse effect plus fifteen (15) days, in which event each of the dates referred
to in Sections 5.1(c), 7.1(b) or 7.1(e) shall be extended for each such period.
 
     8.11 Exculpation. This Agreement shall not impose any personal liability on
any shareholder, trustee, officer, employee or agent of EOP, and all Persons
shall look solely to the property of EOP for the payment of any claim hereunder
or for the performance of this Agreement.
 
                                       44
<PAGE>   433
 
     IN WITNESS WHEREOF, EOP, EOP Partnership, Beacon and Beacon Partnership
have caused this Agreement to be signed by their respective officers (or general
partners) thereunto duly authorized all as of the date first written above.
 
                                            EQUITY OFFICE PROPERTIES TRUST
 
                                            By:   /s/ TIMOTHY H. CALLAHAN
                                              ----------------------------------
                                            Name: Timothy H. Callahan
                                            Title:  President and CEO
 
                                            EOP OPERATING LIMITED PARTNERSHIP
 
                                            By: Equity Office Properties Trust,
                                                its managing general partner
 
                                            By:   /s/ TIMOTHY H. CALLAHAN
                                              ----------------------------------
                                            Name: Timothy H. Callahan
                                            Title:  President and CEO
 
                                            BEACON PROPERTIES CORPORATION
 
                                            By:    /s/ LIONEL P. FORTIN
                                              ----------------------------------
                                            Name: Lionel P. Fortin
                                            Title:  Executive Vice President
 
                                            BEACON PROPERTIES, L.P.
 
                                            By: Beacon Properties Corporation,
                                                its sole general partner
 
                                            By:    /s/ LIONEL P. FORTIN
                                              ----------------------------------
                                            Name: Lionel P. Fortin
                                            Title:  Executive Vice President
 
                                       45
<PAGE>   434
 
                FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER
 
     This First Amendment is entered into as of November 14, 1997 for the
purposes of amending the Agreement and Plan of Merger dated as of September 15,
1997 by and among Equity Office Properties Trust, EOP Operating Limited
Partnership, Beacon Properties Corporation and Beacon Properties, L.P. (the
"Merger Agreement"). All capitalized terms used herein without definition shall
have the meanings ascribed to them in the Merger Agreement.
 
     WHEREAS, the parties hereto desire to amend the Merger Agreement to clarify
certain matters as provided herein.
 
     NOW THEREFORE, in consideration of the mutual covenants set forth herein,
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the parties hereto agree as follows:
 
     Section 1. Preferred Stockholder Voting
 
     Section 5.1(a) of the Merger Agreement shall be amended by deleting clauses
5.1(a)(i)(x) and 5.1(a)(i)(y) in their entirety and replacing them with the
following:
 
     "(x) one or more joint proxy statement(s)/prospectus(es) and forms of
     proxies (such joint proxy statement(s)/prospectus(es) together with any
     amendments or supplements thereto, the "Common Proxy Statement") relating
     to the stockholder meetings of each of Beacon and EOP, the vote of the
     stockholders of Beacon and EOP with respect to the Merger, and the consent,
     if any, of the partners of Beacon Partnership and EOP Partnership in
     connection with any required Partner Approvals and (y) a proxy
     statement/prospectus relating to the issuance of EOP Preferred Shares (the
     "Preferred Proxy Statement" and, together with the Common Proxy Statement,
     the "Proxy Statement") pursuant to the Merger and"
 
     Section 5.1(a) of the Merger Agreement shall be amended further by deleting
the words "and any information statement/prospectus described in clause (y)
above" from the third clause of Section 5.1(a)(ii).
 
     Section 5(d) of the Merger Agreement shall be amended to replace each
reference to the "Proxy Statement" with a reference to the "Common Proxy
Statement."
 
     Section 2. Payment of Final Dividends; Fourth Quarter Dividend
 
     Section 1.14 of the Merger Agreement shall be amended by deleting the last
sentence of Section 1.14(d)(i) and replacing it in its entirety with the
following:
 
     "The dividends payable hereunder to holders of Beacon Common Shares shall
     be paid on the Closing Date prior to the Effective Time."
 
     Section 1.14 of the Merger Agreement shall be amended further to add
Section 1.14(d)(iii) as follows:
 
          "(iii) Notwithstanding anything in this Section 1.14(d) to the
     contrary, if the Closing Date shall occur on or before December 31, 1997,
     (x) Beacon shall declare and pay to its stockholders of record as of
     December 10, 1997, a dividend for the fiscal period commencing October 1,
     1997 and ending immediately prior to the Effective Time of $.50 per Beacon
     Common Share, such dividend to be paid on the Closing Date prior to the
     Effective Time and (y) EOP shall declare and pay to its shareholders of
     record on December 10, 1997, a dividend for the fiscal period commencing
     October 1, 1997 and ending immediately prior to the Effective Time of $.30
     per EOP Common Share, such dividend to be paid on the Closing Date prior to
     the Effective Time. The foregoing dividends shall be in addition to, and
     not in lieu of, any dividends required pursuant to Section 1.14(d)(i).
 
                                       A-1
<PAGE>   435
 
     Section 5.10 of the Merger Agreement shall be amended to add the following
proviso at the beginning of the first sentence of such Section:
 
     "Except as otherwise provided in Section 1.14(d)(iii) of the Agreement,"
 
     Section 3. Registration Rights Agreements
 
     Section 1.11 of the Merger Agreement shall be revised by adding the
following sentences at the end of such section:
 
     "The Form S-4 (as defined below) shall register the issuance of the EOP
     Common Shares to be issued upon the redemption of the EOP OP Units received
     by a holder of Beacon OP Units in the Merger. If EOP is unable to issue EOP
     Common Shares pursuant to the Form S-4 (or another registration statement)
     at the time of a redemption of EOP OP Units by a former holder of Beacon OP
     Units, then EOP agrees to cause the EOP Partnership to redeem such EOP OP
     Units for cash."
 
     Section 5. Additional Covenants
 
     Section 5.1(g) of the Merger Agreement shall be deleted in its entirety and
replaced with the following:
 
     "If on the date of the EOP Shareholders Meeting and Beacon Shareholders
     Meeting established pursuant to Section 5.1(f) of this Agreement, either
     EOP or Beacon has not received duly executed proxies for a sufficient
     number of votes to approve the Merger (but less than one-third of the
     outstanding Beacon Common Shares, one-third of the outstanding Beacon
     Preferred Shares or a majority of the EOP Common Shares, as the case may
     be, have voted against the Merger), than both parties shall recommend the
     adjournment of their respective shareholders meetings until one or more
     dates not later than the date ten (10) days after the originally scheduled
     date of the shareholders meetings."
 
     Section 7. Construction of Merger Agreement
 
     The Merger Agreement shall be read together and shall have the same force
and effect as if the provisions of the Merger Agreement and this First Amendment
were contained in one document. Except as expressly amended by this First
Amendment, the Merger Agreement shall remain in full force and effect in
accordance with its terms.
 
     Section 8. Counterparts
 
     This First Amendment may be executed in any number of counterparts and by
the parties hereto in separate counterparts, each of which when so executed
shall be deemed to be an original and all of which taken together shall
constitute one and the same agreement.
 
                                       A-2
<PAGE>   436
 
     IN WITNESS WHEREOF, EOP, EOP Partnership, Beacon and Beacon Partnership
have caused this Agreement to be signed by their respective officers (or general
partners) thereunto duly authorized all as of the date first written above.
 
                                          EQUITY OFFICE PROPERTIES TRUST
 
                                          By:    /s/ STANLEY M. STEVENS
 
                                            ------------------------------------
                                          Name: Stanley M. Stevens
                                          Title: Executive Vice President
 
                                          EOP OPERATING LIMITED PARTNERSHIP
 
                                          By: Equity Office Properties Trust,
                                              its managing general partner
 
                                              By: /s/ STANLEY M. STEVENS
 
                                              ----------------------------------
                                              Name: Stanley M. Stevens
                                            Title: Executive Vice President
 
                                          BEACON PROPERTIES CORPORATION
 
                                          By:     /s/ LIONEL P. FORTIN
 
                                            ------------------------------------
                                          Name: Lionel P. Fortin
                                          Title: Executive Vice President
 
                                          BEACON PROPERTIES, L.P.
 
                                          By: Beacon Properties Corporation, its
                                              sole general partner
 
                                              By:  /s/ LIONEL P. FORTIN
 
                                              ----------------------------------
                                              Name: Lionel P. Fortin
                                              Title: Executive Vice President
 
                                       A-3
<PAGE>   437
 
                                    ANNEX II
 
                  OPINION OF MORGAN STANLEY & CO. INCORPORATED
<PAGE>   438
 
MORGAN STANLEY
 
                                                        MORGAN STANLEY REALTY
                                                        INCORPORATED
                                                        1585 BROADWAY
                                                        NEW YORK, NEW YORK 10036
                                                        (212) 761-4700
 
                                                        September 15, 1997
 
Board of Directors
Beacon Properties Corporation
50 Rowes Wharf
Boston, MA 02110
 
Members of the Board:
 
     We understand that Beacon Properties Corporation ("Beacon" or the
"Company") and Equity Office Properties Trust ("Equity Office" or "Buyer") have
entered into an Agreement and Plan of Merger, dated September 15, 1997 (the
"Merger Agreement"), which provides, among other things, for the merger (the
"Merger") of Beacon with and into Equity Office. Pursuant to the Merger, each
outstanding share of common stock, par value $0.01 per share (the "Beacon Common
Stock") of Beacon, other than shares held in treasury or held by Buyer or any
affiliate of Buyer or as to which dissenters' rights have been perfected, will
be converted into the right to receive 1.4063 shares of common stock of Buyer,
par value $0.01 per share (the "Buyer Common Stock"), subject to certain
adjustments as set forth in the Merger Agreement. We further understand that, in
connection with the Merger, certain units evidencing limited partnership
interests in Beacon Properties, L.P. will be converted into the right to
exchange each such unit into 1.4063 Class A limited partnership units of EOP
Operating Limited Partnership, subject to certain adjustments as set forth in
the Merger Agreement. The terms and conditions of the Merger are more fully set
forth in the Merger Agreement.
 
     You have asked for our opinion as to whether the consideration to be
received by the holders of shares of Common Stock pursuant to the Merger
Agreement is fair from a financial point of view to such holders (other than
Buyer and its affiliates).
 
     For purposes of the opinion set forth herein, we have:
 
          (i) reviewed certain publicly available financial statements and other
     information of the Company and Buyer, respectively;
 
          (ii) reviewed certain internal financial statements and other
     financial and operating data concerning the Company and Buyer prepared by
     the managements of the Company and Buyer, respectively;
 
          (iii) analyzed certain financial projections for the Company and Buyer
     prepared by the managements of the Company and Buyer, respectively;
 
          (iv) reviewed the reported prices and trading activity for the Beacon
     Common Stock and the Buyer Common Stock;
 
          (v) compared the financial performance of the Company and the Buyer
     and the prices and trading activity of the Beacon Common Stock and Buyer
     Common Stock with that of certain other comparable publicly-traded
     companies and their securities;
 
          (vi) discussed with the senior management of the Company and Buyer
     their estimates of the synergies and cost savings expected to be derived
     from the Merger;
 
          (vii) reviewed the financial terms, to the extent publicly available,
     of certain comparable transactions;
<PAGE>   439
 
                                                                  MORGAN STANLEY
 
Board of Directors
Beacon Properties Corporation
September 15, 1997
Page 2
 
          (viii) reviewed the pro forma impact of the Merger on the Buyer's
     funds from operations per share, consolidated capitalization and financial
     ratios;
 
          (ix) participated in discussions and negotiations among
     representatives of the Company and Buyer and their financial and legal
     advisors;
 
          (x) reviewed the Merger Agreement and certain related documents; and
 
          (xi) performed such other analyses as we have deemed appropriate.
 
     We have assumed and relied upon without independent verification the
accuracy and completeness of the information reviewed by us for the purposes of
this opinion. With respect to the financial projections, including the estimates
of synergies and cost savings expected to be derived from the Merger, we have
assumed that they have been reasonably prepared on bases reflecting the best
currently available estimates and judgments of the future financial performance
of the Company and Buyer. We have not made any independent valuation or
appraisal of the assets or liabilities of the Company or Buyer, nor have we been
furnished with any such appraisals. We note that Buyer completed its initial
public offering on July 7, 1997 and, accordingly, has a limited trading and
operating history as a public company. Our opinion is necessarily based on
economic, market and other conditions as in effect on, and the information made
available to us as of, the date hereof.
 
     In arriving at our opinion, we were not authorized to solicit, and did not
solicit, interest from any party with respect to the acquisition of the Company
or any of its assets, nor did we negotiate with any party other than the Buyer,
with respect to the possible acquisition of the Company.
 
     We have acted as financial advisor to the Board of Directors of the Company
in connection with this transaction and will receive a fee for our services. In
the past, Morgan Stanley Realty Incorporated and its affiliates have provided
financial advisory and financing services for the Company and Buyer and have
received fees for the rendering of these services.
 
     It is understood that this letter is for the information of the Board of
Directors of Beacon and may not be used for any other purpose without our prior
written consent, except that this opinion may be included in its entirety in any
filing made by Beacon with the Securities and Exchange Commission with respect
to the Merger. We express no opinion and make no recommendation as to how
shareholders of Beacon should vote at the shareholders' meeting to be held in
connection with the Merger.
 
     Based upon and subject to the foregoing, we are of the opinion on the date
hereof that the consideration to be received by the holders of shares of Beacon
Common Stock pursuant to the Merger Agreement is fair from a financial point of
view to such holders (other than Buyer and its affiliates).
 
                                          Very truly yours,
 
                                          MORGAN STANLEY REALTY
                                          INCORPORATED
 
                                          By: /s/ W. BLAKE BAIRD
 
                                            ------------------------------------
                                            W. Blake Baird
                                            Principal
<PAGE>   440
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF TRUSTEES AND OFFICERS
 
     Pursuant to its Agreement of Limited Partnership, EOP Partnership is
obligated to indemnify, to the fullest extent provided by law, any person or
entity made a party to a proceeding by reason of its status as a general
partner, a limited partner or a trustee, director or officer of EOP Partnership
or any general partner and such other persons or entities as the EOP Managing
General Partner may designate from time to time in its sole discretion (an
"Indemnitee") from and against any and all losses, claims, damages, liabilities,
joint or several, expenses (including without limitation, attorneys fees and
other legal fees and expenses), judgments, fines, settlements and other amounts
arising from or in connection with any and all claims, demands, actions, suits
or proceedings, civil, criminal, administrative or investigative, incurred by
the Indemnitee and relating to EOP Partnership or the general partners or the
operation of, or the ownership of property by, any of them as set forth in the
EOP Partnership Agreement in which any such Indemnitee may be involved, or is
threatened to be involved, as a party or otherwise, unless it is established by
a final determination of a court of competent jurisdiction that: (i) the act or
omission of the Indemnitee was material to the matter giving rise to the
proceeding and either was committed in bad faith or was the result of active and
deliberate dishonesty, (ii) the Indemnitee actually received an improper
personal benefit in money, property or services or (iii) in the case of any
criminal proceeding, the Indemnitee had reasonable cause to believe that the act
or omission was unlawful. Any indemnification shall be made only out of the
assets of EOP Partnership and any insurance proceeds from the liability policy
covering the general partners and any Indemnitee, and neither a general partner
nor any limited partner shall have any obligation to contribute to the capital
of EOP Partnership or otherwise provide funds to enable EOP Partnership to fund
its indemnity obligations. EOP Partnership is obligated to advance amounts to an
Indemnitee for expenses upon receipt of (i) a written affirmation of the
Indemnitee that it believes it has met the standard of conduct necessary to
entitle it to indemnification and (ii) a written undertaking of the Indemnitee
that it will repay any such advances if it shall be ultimately determined that
it did not meet such standard of conduct. The foregoing indemnification rights
are in addition to any other rights afforded to an Indemnitee under any other
agreement, by vote of the partners, under applicable law or otherwise, and shall
continue as to an Indemnitee who has ceased to serve in such capacity unless
otherwise provided in a written agreement pursuant to which such Indemnitees are
indemnified. EOP Partnership is authorized to purchase and maintain insurance on
behalf of the Indemnitees with respect to the foregoing matters. EOP Partnership
shall be deemed to have requested an Indemnitee to serve as fiduciary of an
employee benefit plan whenever the performance by it of its duties to EOP
Partnership also imposes duties on, or otherwise involves services by, it to the
plan or participants or beneficiaries of the plan; excise taxes assessed on an
Indemnitee with respect to an employee benefit plan pursuant to applicable law
shall constitute fines; and actions taken or omitted by the Indemnitee with
respect to an employee benefit plan in the performance of its duties for a
purpose reasonably believed by it to be in the interest of the participants and
beneficiaries of the plan shall be deemed to be for a purpose which is not
opposed to the best interests of EOP Partnership. An Indemnitee shall not be
denied indemnification in whole or in part because the Indemnitee had an
interest in the transaction with respect to which the indemnification applies if
the transaction was otherwise permitted by the terms of the EOP Partnership
Agreement.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
<TABLE>
<S>     <C>  <S>
 3.1*   --   Amended and Restated Declaration of Trust of EOP
 3.2    --   Bylaws of EOP
 3.3    --   Form of Articles Supplementary for the 8.98% Series A
             Cumulative Redeemable Preferred Shares of Beneficial
             Interest of EOP
 5.1    --   Opinion of Hogan & Hartson L.L.P. regarding the validity of
             the securities being registered
 8.1+   --   Opinion of Hogan & Hartson L.L.P. regarding certain tax
             matters
 8.2+   --   Opinion of Goodwin, Procter & Hoar LLP regarding certain
             federal income tax matters
 9.1    --   EOP Voting Agreement
</TABLE>
 
                                      II-1
<PAGE>   441
 9.2    --   Beacon Voting Agreement
10.1*   --   Form of Agreement of Limited Partnership of EOP Partnership
10.2*   --   Form of Registration Rights Agreement between EOP and the
             persons named therein
10.3*   --   1997 Shares Option and Share Award Plan
10.4*   --   1997 Non-Qualified Employee Share Purchase Plan
10.5*   --   Noncompetition Agreement between EOP and Samuel Zell
10.6*   --   Contribution Agreement
10.7    --   Stock Purchase Agreement, dated as of September 14, 1997,
             between certain holders of voting stock of Beacon Property
             Management Corporation and Equity Office Properties
             Management Corp.
10.8    --   Stock Purchase Agreement, dated as of September 14, 1997,
             between certain holders of voting stock of Beacon Design
             Corporation and Equity Office Properties Management Corp.
10.9    --   Stock Purchase Agreement, dated as of September 14, 1997,
             between certain holders of voting stock of Beacon
             Construction Company, Inc. and Equity Office Properties
             Management Corp.
21.1*   --   List of Subsidiaries
23.1    --   Consent of Hogan & Hartson L.L.P. (included as part of
             Exhibit 5.1)
23.2    --   Consent of Ernst & Young LLP
23.3    --   Consent of Coopers Lybrand L.L.P.
23.4+   --   Consent of Hogan & Hartson L.L.P. (included as part of
             Exhibit 8.1)
23.5+   --   Consent of Goodwin, Procter & Hoar LLP (included as part of
             Exhibit 8.2)
23.6    --   Consent of Morgan Stanley Realty Incorporated
24.1    --   Power of Attorney (included in the Signature Pages at pages
             II-4 and II-5)
27.1    --   Financial Data Schedule
99.1    --   Form of Proxy for Beacon Unitholders
99.2    --   Form of Letter to Beacon Unitholders
99.3    --   Form of Notice to Beacon Unitholders
99.4    --   Consent of Alan M. Leventhal to be Named as a Trustee
99.5    --   Consent of Edwin N. Sidman to be Named as a Trustee
 
- -------------------------
* Included as an exhibit to Form S-11 Registration Statement of Equity Office
  Properties Trust, File No. 333-26629, and incorporated herein by reference.
 
+ To be filed as an amendment to this Registration Statement.
 
ITEM 22. UNDERTAKINGS
 
     The Registrant hereby undertakes:
 
          (1) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this registration statement:
 
             (i) To include any prospectus required by section 10(a)(3) of the
        Securities Act of 1933;
 
             (ii) To reflect in the prospectus any facts or events arising after
        the effective date of the registration statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the registration statement. Notwithstanding the foregoing, any
        increase or decrease in volume of securities offered (if the total
        dollar value of securities offered would not exceed that which was
        registered) and any deviation from the low or high and of the estimated
        maximum offering range may be reflected in the form of prospectus filed
        with the Commission pursuant to Rule 424(b) if, in the aggregate, such
        changes in volume and price represent no more than a 20% change in the
        maximum aggregated offering price set forth in the "Calculation of
        Registration Fee" table in the effective registration statement;
 
                                      II-2
<PAGE>   442
 
             (iii) To include any material information with respect to the plan
        of distribution not previously disclosed in the registration statement
        or any material change to such information in the registration
        statement.
 
          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
          (4) That prior to any public reoffering of the securities registered
     hereunder through use of a prospectus which is a part of this registration
     statement, by any person or party who is deemed to be an underwriter within
     the meaning of Rule 145(c), the registrant undertakes that such reoffering
     prospectus will contain the information called for by the applicable
     registration form with respect to reofferings by persons who may be deemed
     underwriters, in addition to the information called for by the other items
     of the applicable form.
 
          (5) That every prospectus: (i) that is filed pursuant to paragraph (4)
     immediately preceding, or (ii) that purports to meet the requirements of
     Section 10(a)(3) of the Act and is used in connection with an offering of
     securities subject to Rule 415, will be filed as a part of an amendment to
     the registration statement and will not be used until such amendment is
     effective, and that, for purposes of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (6) Insofar as indemnification for liabilities arising under the
     Securities Act of 1933 may be permitted to directors, officers and
     controlling persons of the registrant pursuant to the foregoing provisions,
     or otherwise, the registrant has been advised that in the opinion of the
     Securities and Exchange Commission such indemnification is against public
     policy as expressed in the Act and is, therefore, unenforceable. In the
     event that a claim for indemnification against such liabilities (other than
     the payment by the registrant of expenses incurred or paid by a director,
     officer or controlling person of the registrant in the successful defense
     of any action, suit or proceeding) is asserted by such director, officer or
     controlling person in connection with the securities being registered, the
     registrant will, unless in the opinion of its counsel the matter has been
     settled by controlling precedent, submit to a court of appropriate
     jurisdiction the question whether such indemnification by it is against
     public policy as expressed in the Act and will be governed by the final
     adjudication of such issue.
 
          (7) To respond to requests for information that is incorporated by
     reference into the prospectus pursuant to Item 4, 10(b), 11, or 13 of this
     form, within one business day of receipt of such request, and to send the
     incorporated documents by first class mail or other equally prompt means.
     This includes information contained in documents filed subsequent to the
     effective date of the registration statement through the date of responding
     to the request.
 
          (8) To supply by means of a post-effective amendment all information
     concerning a transaction, and the company being acquired involved therein,
     that was not the subject of and included in the registration statement when
     it became effective.
 
                                      II-3
<PAGE>   443
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act, the registrant has duly
caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Chicago, State of
Illinois on November 17, 1997.
 
                                          EOP Operating Limited Partnership
 
                                          By: Equity Office Properties Trust,
                                            as Managing General Partner
 
                                              By: /s/ TIMOTHY H. CALLAHAN
 
                                               ---------------------------------
                                                      Timothy H. Callahan
                                                 President and Chief Executive
                                                             Officer
 
     Each person whose signature appears below, hereby constitutes and appoints
Samuel Zell and Timothy H. Callahan, or either of them, his attorneys-in-fact
and agents, with full power of substitution and resubstitution for him in any
and all capacities, to sign any or all amendments or post-effective amendments
to this Registration Statement, and to file the same, with exhibits thereto and
other documents in connection therewith or in connection with the registration
of the Class A Units of Limited Partnership Interest under the Exchange Act,
with the Securities and Exchange Commission, granting unto each of such
attorneys-in-fact and agents full power and authority to do and perform each and
every act and thing requisite and necessary in connection with such matters as
fully to all intents and purposes as he might or could in person, hereby
notifying and confirming all that each of such attorneys-in-fact and agents or
his substitute or substitutes may do or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated as of the 17th day of November, 1997.
 
<TABLE>
<CAPTION>
                     SIGNATURE                                            TITLE
                     ---------                                            -----
<C>                                                  <S>
 
              /s/ TIMOTHY H. CALLAHAN                President, Chief Executive Officer and Trustee
- ---------------------------------------------------
                Timothy H. Callahan
 
              /s/ RICHARD D. KINCAID                 Chief Financial Officer (principal financial
- ---------------------------------------------------  officer and principal accounting officer)
                  Richard Kincaid
 
                  /s/ SAMUEL ZELL                    Chairman of the Board of Trustees
- ---------------------------------------------------
                    Samuel Zell
 
              /s/ SHELI Z. ROSENBERG                 Trustee
- ---------------------------------------------------
                Sheli Z. Rosenberg
 
                                                     Trustee
- ---------------------------------------------------
                Thomas E. Dobrowski
 
             /s/ JAMES D. HARPER, JR.                Trustee
- ---------------------------------------------------
               James D. Harper, Jr.
 
                                                     Trustee
- ---------------------------------------------------
                  Peter Linneman
 
                                                     Trustee
- ---------------------------------------------------
                Jerry M. Reinsdorf
 
              /s/ WILLIAM M. GOODYEAR                Trustee
- ---------------------------------------------------
                William M. Goodyear
 
                /s/ DAVID K. MCKOWN                  Trustee
- ---------------------------------------------------
                  David K. McKown
</TABLE>
 
                                      II-4
<PAGE>   444
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act, the registrant has duly
caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Chicago, State of
Illinois on November 17, 1997.
 
                                          Equity Office Properties Trust
 
                                          By:    /s/ TIMOTHY H. CALLAHAN
 
                                            ------------------------------------
                                                    Timothy H. Callahan
                                               President and Chief Executive
                                                           Officer
 
     Each person whose signature appears below, hereby constitutes and appoints
Samuel Zell and Timothy H. Callahan, or either of them, his attorneys-in-fact
and agents, with full power of substitution and resubstitution for him in any
and all capacities, to sign any or all amendments or post-effective amendments
to this Registration Statement, and to file the same, with exhibits thereto and
other documents in connection therewith or in connection with the registration
of the Common Shares under the Exchange Act, with the Securities and Exchange
Commission, granting unto each of such attorneys-in-fact and agents full power
and authority to do and perform each and every act and thing requisite and
necessary in connection with such matters as fully to all intents and purposes
as he might or could in person, hereby notifying and confirming all that each of
such attorneys-in-fact and agents or his substitute or substitutes may do or
cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated as of the 17th day of November, 1997.
 
<TABLE>
<CAPTION>
                     SIGNATURE                                            TITLE
                     ---------                                            -----
<C>                                                  <S>
 
              /s/ TIMOTHY H. CALLAHAN                President, Chief Executive Officer and Trustee
- ---------------------------------------------------
                Timothy H. Callahan
 
              /s/ RICHARD D. KINCAID                 Chief Financial Officer (principal financial
- ---------------------------------------------------  officer and principal accounting officer)
                  Richard Kincaid
 
                  /s/ SAMUEL ZELL                    Chairman of the Board of Trustees
- ---------------------------------------------------
                    Samuel Zell
 
              /s/ SHELI Z. ROSENBERG                 Trustee
- ---------------------------------------------------
                Sheli Z. Rosenberg
 
                                                     Trustee
- ---------------------------------------------------
                Thomas E. Dobrowski
 
             /s/ JAMES D. HARPER, JR.                Trustee
- ---------------------------------------------------
               James D. Harper, Jr.
 
                                                     Trustee
- ---------------------------------------------------
                  Peter Linneman
 
                                                     Trustee
- ---------------------------------------------------
                Jerry M. Reinsdorf
 
              /s/ WILLIAM M. GOODYEAR                Trustee
- ---------------------------------------------------
                William M. Goodyear
 
                /s/ DAVID K. MCKOWN                  Trustee
- ---------------------------------------------------
                  David K. McKown
</TABLE>
 
                                      II-5
<PAGE>   445
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
EXHIBIT NO.                           DESCRIPTION OF EXHIBIT                       PAGE NO.
- -----------                           ----------------------                       --------
<C>           <C>  <S>                                                             <C>
    3.1*      --   Amended and Restated Declaration of Trust of EOP
    3.2       --   Bylaws of EOP
    3.3       --   Form of Articles Supplementary for the 8.98% Series A
                   Cumulative Redeemable Preferred Shares of Beneficial
                   Interest of EOP
    5.1       --   Opinion of Hogan & Hartson L.L.P. regarding the validity of
                   the securities being registered
    8.1+      --   Opinion of Hogan & Hartson L.L.P. regarding certain tax
                   matters
    8.2+      --   Opinion of Goodwin, Procter & Hoar LLP regarding certain
                   federal income tax matters
    9.1       --   EOP Voting Agreement
    9.2       --   Beacon Voting Agreement
   10.1*      --   Form of Agreement of Limited Partnership of EOP Partnership
   10.2*      --   Form of Registration Rights Agreement between EOP and the
                   persons named therein
   10.3*      --   1997 Shares Option and Share Award Plan
   10.4*      --   1997 Non-Qualified Employee Share Purchase Plan
   10.5*      --   Noncompetition Agreement between EOP and Samuel Zell
   10.6*      --   Contribution Agreement
   10.7       --   Stock Purchase Agreement, dated as of September 14, 1997,
                   between certain holders of voting stock of Beacon Property
                   Management Corporation and Equity Office Properties
                   Management Corp.
   10.8       --   Stock Purchase Agreement, dated as of September 14, 1997,
                   between certain holders of voting stock of Beacon Design
                   Corporation and Equity Office Properties Management Corp.
   10.9       --   Stock Purchase Agreement, dated as of September 14, 1997,
                   between certain holders of voting stock of Beacon
                   Construction Company, Inc. and Equity Office Properties
                   Management Corp.
   21.1*      --   List of Subsidiaries
   23.1       --   Consent of Hogan & Hartson L.L.P. (included as part of
                   Exhibit 5.1)
   23.2       --   Consent of Ernst & Young LLP
   23.3       --   Consent of Coopers Lybrand L.L.P.
   23.4+      --   Consent of Hogan & Hartson L.L.P. (included as part of
                   Exhibit 8.1)
   23.5+      --   Consent of Goodwin, Procter & Hoar LLP (included as part of
                   Exhibit 8.2)
   23.6       --   Consent of Morgan Stanley Realty Incorporated
   24.1       --   Power of Attorney (included in the Signature Pages at pages
                   II-4 and II-5)
   27.1       --   Financial Data Schedule
   99.1       --   Form of Proxy for Beacon Unitholders
   99.2       --   Form of Letter to Beacon Unitholders
   99.3       --   Form of Notice to Beacon Unitholders
   99.4       --   Consent of Alan M. Leventhal to be Named as a Trustee
   99.5       --   Consent of Edwin N. Sidman to be Named as a Trustee
</TABLE>
 
- -------------------------
* Included as an exhibit to Form S-11 Registration Statement of Equity Office
  Properties Trust, File No. 333-26629, and incorporated herein by reference.
 
+ To be filed as an amendment to this Registration Statement.
 
                                      II-6

<PAGE>   1
                                                                     EXHIBIT 3.2


                       EQUITY OFFICE PROPERTIES TRUST

                                   BYLAWS

                                  ARTICLE I

                                   OFFICES

     Section 1.  PRINCIPAL OFFICE.  The principal office of Equity Office
Properties Trust (the "Trust") shall be located at such place or places as the
Trustees may designate.

     Section 2.  ADDITIONAL OFFICES.  The Trust may have additional offices at
such places as the Trustees may from time to time determine or the business of
the Trust may require.


                                   ARTICLE II

                            MEETINGS OF SHAREHOLDERS

     Section 1.  PLACE.  All meetings of shareholders shall be held at the
principal office of the Trust or at such other place within the United States
as shall be stated in the notice of the meeting.

     Section 2.  ANNUAL MEETING.  An annual meeting of the shareholders for the
election of Trustees and the transaction of any business within the powers of
the Trust shall be held during the month of May of each year, after the
delivery of the annual report referred to in Section 12 of this Article II, at
a convenient location and on proper notice, on a date and at the time set by
the Trustees, beginning with the year 1998.  Failure to hold an annual meeting
does not invalidate the Trust's existence or affect any otherwise valid acts of
the Trust.

     Section 3.  SPECIAL MEETINGS.  The chairman of the board or the president
or one-third of the Trustees may call special meetings of the shareholders.
Special meetings of shareholders shall also be called by the secretary upon the
written request of the holders of shares entitled to cast not less than a
majority of all the votes entitled to be cast at such meeting.  Such request
shall state the purpose of such meeting and the matters proposed to be acted on
at such meeting.  Within ten (10) days of the receipt of such a request, the
secretary shall inform such shareholders of the reasonably estimated cost of
preparing and mailing notice of the meeting (including all proxy materials that
may be required in connection therewith) and, upon payment by such shareholders
to the Trust of such costs, the secretary shall, within thirty (30) days of
such payment, or such longer period as may be necessitated by compliance with
any applicable statutory or regulatory requirements, give notice to each
shareholder entitled to notice of the meeting.

     Unless requested by shareholders entitled to cast a majority of all the
votes entitled to be cast at such meeting, a special meeting need not be called
to consider any matter which is substantially the same as a matter voted on at
any meeting of the shareholders held during the preceding twelve months.

<PAGE>   2

     Section 4.  NOTICE.  Not less than ten nor more than 90 days before each
meeting of shareholders, the secretary shall give to each shareholder entitled
to vote at such meeting and to each shareholder not entitled to vote who is
entitled to notice of the meeting written or printed notice stating the time
and place of the meeting and, in the case of a special meeting or as otherwise
may be required by any statute, the purpose for which the meeting is called,
either by mail or by presenting it to such shareholder personally or by leaving
it at his residence or usual place of business.  If mailed, such notice shall
be deemed to be given when deposited in the United States mail addressed to the
shareholder at his post office address as it appears on the records of the
Trust, with postage thereon prepaid.

     Section 5.  SCOPE OF NOTICE.  Any business of the Trust may be transacted
at an annual meeting of shareholders without being specifically designated in
the notice, except such business as is required by any statute to be stated in
such notice.  No business shall be transacted at a special meeting of
shareholders except as specifically designated in the notice.

     Section 6.  ORGANIZATION.  At every meeting of the shareholders, the
Chairman of the Board, if there be one, shall conduct the meeting or, in the
case of vacancy in office or absence of the Chairman of the Board, one of the
following officers present shall conduct the meeting in the order stated: the
Vice Chairman of the Board, if there be one, the President, the Vice Presidents
in their order of rank and seniority, or a Chairman chosen by the shareholders
entitled to cast a majority of the votes which all shareholders present in
person or by proxy are entitled to cast, shall act as Chairman, and the
Secretary, or, in his absence, an assistant secretary, or in the absence of
both the Secretary and assistant secretaries, a person appointed by the
Chairman shall act as Secretary.

     Section 7.  QUORUM.  At any meeting of shareholders, the presence in
person or by proxy of shareholders entitled to cast a majority of all the votes
entitled to be cast at such meeting shall constitute a quorum; but this section
shall not affect any requirement under any statute or the declaration of trust
("Declaration of Trust") for the vote necessary for the adoption of any
measure.  If, however, such quorum shall not be present at any meeting of the
shareholders, the shareholders entitled to vote at such meeting, present in
person or by proxy, shall have the power to adjourn the meeting from time to
time to a date not more than 120 days after the original record date without
notice other than announcement at the meeting.  At such adjourned meeting at
which a quorum shall be present, any business may be transacted which might
have been transacted at the meeting as originally notified.

     Section 8.  VOTING.  A plurality of all the votes cast at a meeting of
shareholders duly called and at which a quorum is present shall be sufficient
to elect a Trustee.  Each share may be voted for as many individuals as there
are Trustees to be elected and for whose election the share is entitled to be
voted.  A majority of the votes cast at a meeting of shareholders duly called
and at which a quorum is present shall be sufficient to approve any other
matter which may properly come before the meeting, unless more than a majority
of the votes cast is required herein or by statute or by the Declaration of
Trust.  Unless otherwise provided in the Declaration of Trust, each outstanding
share, regardless of class, shall be entitled to one vote on each matter
submitted to a vote at a meeting of shareholders.

     Section 9.  PROXIES.  A shareholder may cast the votes entitled to be cast
by the shares owned of record by him either in person or by proxy executed in
writing by the shareholder or by his duly authorized attorney in fact.  Such
proxy shall be filed with the 


                                      2

<PAGE>   3

Secretary of the Trust before or at the time of the meeting.  No proxy shall be
valid after eleven months from the date of its execution, unless otherwise
provided in the proxy.

     Section 10.  VOTING OF SHARES BY CERTAIN HOLDERS.  Shares of the Trust
registered in the name of a corporation, partnership, trust or other entity, if
entitled to be voted, may be voted by the president or a vice president, a
general partner or trustee thereof, as the case may be, or a proxy appointed by
any of the foregoing individuals, unless some other person who has been
appointed to vote such shares pursuant to a bylaw or a resolution of the
governing board of such corporation or other entity or agreement of the
partners of the partnership presents a certified copy of such bylaw, resolution
or agreement, in which case such person may vote such shares.  Any trustee or
other fiduciary may vote shares registered in his name as such fiduciary,
either in person or by proxy.

     Shares of the Trust directly or indirectly owned by it shall not be voted
at any meeting and shall not be counted in determining the total number of
outstanding shares entitled to be voted at any given time, unless they are held
by it in a fiduciary capacity, in which case they may be voted and shall be
counted in determining the total number of outstanding shares at any given
time.

     The Trustees may adopt by resolution a procedure by which a shareholder
may certify in writing to the Trust that any shares registered in the name of
the shareholder are held for the account of a specified person other than the
shareholder.  The resolution shall set forth the class of shareholders who may
make the certification, the purpose for which the certification may be made,
the form of certification and the information to be contained in it; if the
certification is with respect to a record date or closing of the share transfer
books, the time after the record date or closing of the share transfer books
within which the certification must be received by the Trust; and any other
provisions with respect to the procedure which the Trustees consider necessary
or desirable. on receipt of such certification, the person specified in the
certification shall be regarded as, for the purposes set forth in the
certification, the shareholder of record of the specified shares in place of
the shareholder who makes the certification.

     Notwithstanding any other provision contained herein or in the Declaration
of Trust or these Bylaws, Title 3, Subtitle 7 of the Corporations and
Associations Article of the Annotated Code of Maryland (or any successor
statute) shall not apply to any acquisition by any person of shares of
beneficial interest of the Trust.  This section may be repealed, in whole or in
part, at any time, whether before or after an acquisition of control shares
and, upon such repeal, may, to the extent provided by any successor bylaw,
apply to any prior or subsequent control share acquisition.

     Section 11.  INSPECTORS.  At any meeting of shareholders, the chairman of
the meeting may appoint one or more persons as inspectors for such meeting.
Such inspectors shall ascertain and report the number of shares represented at
the meeting based upon their determination of the validity and effect of
proxies, count all votes, report the results and perform such other acts as are
proper to conduct the election and voting with impartiality and fairness to all
the shareholders.

     Each report of an inspector shall be in writing and signed by him or by a
majority of them if there is more than one inspector acting at such meeting.
If there is more than one inspector, 

                                      3

<PAGE>   4

the report of a majority shall be the report of the inspectors.  The report of
the inspector or inspectors on the number of shares represented at the meeting 
and the results of the voting shall be prima facie evidence thereof.

     Section 12.  REPORTS TO SHAREHOLDERS.  The Trustees shall submit to the
shareholders at or before the annual meeting of shareholders a report of the
business and operations of the Trust during such fiscal year, containing a
balance sheet and a statement of income and surplus of the Trust, accompanied
by the certification of an independent certified public accountant, and such
further information as the Trustees may determine is required pursuant to any
law or regulation to which the Trust is subject.  Within the earlier of 20 days
after the annual meeting of shareholders or 120 days after the end of the
fiscal year of the Trust, the Trustees shall place the annual report on file at
the principal office of the Trust and with any governmental agencies as may be
required by law and as the Trustees may deem appropriate.

     Section 13.  NOMINATIONS AND PROPOSALS BY SHAREHOLDERS.

             (a)  Annual Meetings of Shareholders.  (1)  Nominations of persons
for election to the Board of Trustees and the proposal of business to be 
considered by the shareholders may be made at an annual meeting of shareholders
(i) pursuant to the Trust's notice of meeting, (ii) by or at the direction of 
the Trustees or (iii) by any shareholder of the Trust who was a shareholder of
record both at the time of giving of notice provided for in this Section 13 (a)
and at the time of the annual meeting, who is entitled to vote at the meeting
and who complied with the notice procedures set forth in this Section 13(a).

             (2)  For nominations or other business to be properly brought 
before an annual meeting by a shareholder pursuant to clause (iii) of paragraph
(a) (1) of this Section 13, the shareholder must have given timely notice
thereof in writing to the Secretary of the Trust and such other business must
otherwise be a proper matter for action by shareholders.  To be timely, a
shareholder's notice shall be delivered to the Secretary at the principal
executive offices of the Trust not later than the close of business on the 60th
day nor earlier than the close of business on the 90th day prior to the first
anniversary of the preceding year's annual meeting; provided, however, that in
the event that the date of the annual meeting is advanced by more than 30 days
or delayed by more than 60 days from such anniversary date or if the Trust has
not previously held an annual meeting, notice by the shareholder to be timely
must be so delivered not earlier than the close of business on the 90th day
prior to such annual meeting and not later than the close of business on the
later of the 60th day prior to such annual meeting or the tenth day following
the day on which public announcement of the date of such meeting is first made
by the Trust.  In no event shall the public announcement of a postponement or
adjournment of an annual meeting to a later date or time commence a new time
period for the giving of a shareholder's notice as described above.  Such
shareholder's notice shall set forth as to each person whom the shareholder
proposes to nominate for election or reelection as a Trustee all information
relating to such person that is required to be disclosed in solicitations of
proxies for election of Trustees in an election contest, or is otherwise
required, in each case pursuant to Regulation 14A under the Securities Exchange
Act of 1934, as amended (the "Exchange Act") (including such person's written
consent to being named in the proxy statement as a nominee and to serving as a
Trustee if elected); (ii) as to any other business that the shareholder
proposes to bring before the meeting, a brief description of the business       
desired to be brought before the meeting, the reasons for conducting such
business at 

                                      4


<PAGE>   5

the meeting and any material interest in such business of such shareholder and 
of the beneficial owner, if any, on whose behalf the proposal is made; and 
(iii) as to the shareholder giving the notice and the beneficial owner, if any,
on whose behalf the nomination or proposal is made, (x) the name and address of
such shareholder, as they appear on the Trust's books, and of such beneficial 
owner and (y) the number of each class of shares of the Trust which are owned 
beneficially and of record by such shareholder and such beneficial owner.

             (3)  Notwithstanding anything in the second sentence of paragraph 
(a) (2) of this Section 13 to the contrary, in the event that the number of
Trustees to be elected to the Board of Trustees is increased and there is no
public announcement by the Trust naming all of the nominees for Trustee or
specifying the size of the increased Board of Trustees at least 70 days prior
to the first anniversary of the preceding year's annual meeting, a
shareholder's notice required by this Section 13(a) shall also be considered
timely, but only with respect to nominees for any new positions created by such
increase, if it shall be delivered to the secretary at the principal executive
offices of the Trust    not later than the close of business on the tenth day
following the day on which such public announcement is first made by the Trust.

     (b)  Special Meetings of Shareholders.  Only such business shall be
conducted at a special meeting of shareholders as shall have been brought
before the meeting pursuant to the Trust's notice of meeting.  Nominations of
persons for election to the Board of Trustees may be made at a special meeting
of shareholders at which Trustees are to be elected (i) pursuant to the Trusts
notice of meeting (ii) by or at the direction of the Board of Trustees or (iii)
provided that the Board of Trustees has determined that Trustees shall be
elected at such special meeting, by any shareholder of the Trust who was a
shareholder of record both at the time of giving of notice provided for in this
Section 13(b) and at the time of the special meeting, who is entitled to vote
at the meeting and who complied with the notice procedures set forth in this
Section 13 (b).  In the event the Trust calls a special meeting of shareholders
for the purpose of electing one or more Trustees to the Board of Trustees, any
such shareholder may nominate a person or persons (as the case may be) for
election to such position as specified in the Trust's notice of meeting, if the
shareholder's notice containing the information required by paragraph (a) (2)
of this Section 13 shall be delivered to the Secretary at the principal
executive offices of the Trust not earlier than the close of business on the
90th day prior to such special meeting and not later than the close of business
on the later of the 60th day prior to such special meeting or the tenth day
following the day on which public announcement is first made of the date of the
special meeting and of the nominees proposed by the Trustees to be elected at
such meeting.  In no event shall the public announcement of a postponement or
adjournment of a special meeting to a later date or time commence a new time
period for the giving of a shareholder's notice as described above.

     (c)  General.  (1) Only such persons who are nominated in accordance with
the procedures set forth in this Section 13 shall be eligible to serve as
Trustees and only such business shall be conducted at a meeting of shareholders
as shall have been brought before the meeting in accordance with the procedures
set forth in this Section 13.  The chairman of the meeting shall have the power
and duty to determine whether a nomination or any business proposed to be
brought before the meeting was made or proposed, as the case may be, in
accordance with the procedures set forth in this Section 13 and, if any
proposed nomination or business is not in compliance with this Section 13, to
declare that such nomination or proposal shall be disregarded.

                                      5

<PAGE>   6

             (2)  For purposes of this Section 13, "public announcement" shall 
mean disclosure in a press release reported by the Dow Jones News Service,
Associated Press or comparable news service or in a document publicly filed by
the Trust with the Securities and Exchange Commission pursuant to Section 13,
14 or 15(d) of the Exchange Act.

             (3) Notwithstanding the foregoing provisions of this Section 13, a
shareholder shall also comply with all applicable requirements of state law and
of the Exchange Act and the rules and regulations thereunder with respect to
the matters set forth in this Section 13.  Nothing in this Section 13 shall be
deemed to affect any rights of shareholders to request inclusion of proposals
in, nor any of the rights of the Trust to omit a proposal from, the Trust's
proxy statement pursuant to Rule 14a-8 under the Exchange Act.

     Section 14.  INFORMAL ACTION BY SHAREHOLDERS.  Notwithstanding the
provisions of Section 13 of this Article II, any action required or permitted
to be taken at a meeting of shareholders may be taken without a meeting if a
consent in writing, setting forth such action, is signed by shareholders
entitled to cast a sufficient number of votes to approve the matter, as 
required by statute, the Declaration of Trust of the Trust or these Bylaws, and
such consent is filed with the minutes of proceedings of the shareholders.

     Section 15.  VOTING BY BALLOT.  Voting on any question or in any election
may be viva voce unless the presiding officer shall order or any shareholder
shall demand that voting be by ballot.


                                 ARTICLE III

                                  TRUSTEES

     Section 1.  GENERAL POWERS; QUALIFICATIONS; TRUSTEES HOLDING OVER.  The
business and affairs of the Trust shall be managed under the direction of its
Board of Trustees.  A Trustee shall be an individual at least 21 years of age
who is not under legal disability.  In case of failure to elect Trustees at an
annual meeting of the shareholders, the Trustees holding over shall continue to
direct the management of the business and affairs of the Trust until their
successors are elected and qualify.

     Section 2.  NUMBER.  At any regular meeting or at any special meeting
called for that purpose, a majority of the entire Board of Trustees may
establish, increase or decrease the number of Trustees, subject to any
limitations on the number of Trustees set forth in the Declaration of Trust.
Except during the period when a vacancy exists, at least two-thirds of the
Trustees shall be persons who are not executive officers of the Trust or
persons affiliated with Samuel Zell or his affiliates ("Independent Trustees").
For purposes of this Section, the terms "executive officers" and "affiliated"
shall have the definitions set forth in Rule 405 under the Securities Act of
1933, as amended.

     Section 3.  ANNUAL AND REGULAR MEETINGS.  An annual meeting of the
Trustees shall be held immediately after and at the same place as the annual
meeting of shareholders, no notice other than this Bylaw being necessary.  The
Trustees may provide, by resolution, the time and place, either within or
without the State of Maryland, for the holding of regular meetings of the
Trustees without other notice than such resolution.


                                      6

<PAGE>   7

     Section 4.  SPECIAL MEETINGS.  Special meetings of the Trustees may be
called by or at the request of the chairman of the board or the president or by
a majority of the Trustees then in office.  The person or persons authorized to
call special meetings of the Trustees may fix any place, either within or
without the State of Maryland, as the place for holding any special meeting of
the Trustees called by them.

     Section 5.  NOTICE.  Notice of any special meeting shall be given by
written notice delivered personally, telegraphed, facsimile-transmitted or
mailed to each Trustee at his business or residence address.  Personally
delivered or telegraphed notices shall be given at least two days prior to the
meeting.  Notice by mail shall be given at least five days prior to the
meeting.  Telephone or facsimile-transmission notice shall be given at least 24
hours prior to the meeting.  If mailed, such notice shall be deemed to be given
when deposited in the United States mail properly addressed, with postage
thereon prepaid.  If given by telegram, such notice shall be deemed to be given
when the telegram is delivered to the telegraph company.  Telephone notice
shall be deemed given when the Trustee is personally given such notice in a
telephone call to which he is a party.  Facsimile-transmission notice shall be
deemed given upon completion of the transmission of the message to the number
given to the Trust by the Trustee and receipt of a completed answer-back
indicating receipt.  Neither the business to be transacted at, nor the purpose
of, any annual, regular or special meeting of the Trustees need be stated in
the notice, unless specifically required by statute or these Bylaws.

     Section 6.  QUORUM.  A majority of the Trustees shall constitute a quorum
for transaction of business at any meeting of the Trustees, provided that, if
less than a majority of such Trustees are present at said meeting, a majority
of the Trustees present may adjourn the meeting from time to time without
further notice, and provided further that if, pursuant to the Declaration of
Trust or these Bylaws, the vote of a majority of a particular group of Trustees
is required for action, a quorum must also include a majority of such group.

     The Trustees present at a meeting which has been duly called and convened
may continue to transact business until adjournment, notwithstanding the
withdrawal of enough Trustees to leave less than a quorum.

     Section 7.  VOTING.  The action of the majority of the Trustees present at
a meeting at which a quorum is present shall be the action of the Trustees,
unless the concurrence of a greater proportion is required for such action by
applicable statute.

     Section 8.  TELEPHONE MEETINGS.  Trustees may participate in a meeting by
means of a conference telephone or similar communications equipment if all
persons participating in the meeting can hear each other at the same time.
Participation in a meeting by these means shall constitute presence in person
at the meeting.

     Section 9.  INFORMAL ACTION BY TRUSTEES.  Any action required or permitted
to be taken at any meeting of the Trustees may be taken without a meeting, if a
consent in writing to such action is signed by each Trustee and such written
consent is filed with the minutes of proceedings of the Trustees.

     Section 10.  VACANCIES.  If for any reason any or all of the Trustees
cease to be Trustees, such event shall not terminate the Trust or affect these
Bylaws or the powers of the 

                                      7

<PAGE>   8

remaining Trustees hereunder (even if fewer than two Trustees remain).  Any
vacancy (including a vacancy created by an increase in the number of Trustees)
shall be filled, at any regular meeting or at any special meeting called
for that purpose, by a majority of the Trustees.  Any individual so elected as
Trustee shall hold office until the next annual meeting of shareholders.

     Section 11.  COMPENSATION; FINANCIAL ASSISTANCE.

     (a)  Compensation.  Trustees shall not receive any stated salary for their
services as Trustees but, by resolution of the Trustees, may receive fixed sums
per year and/or per meeting and/or per visit to real property owned or to be
acquired by the Trust and for any service or activity they performed or engaged
in as Trustees.  Such fixed sums may be paid either in cash or in shares of the
Trust.  Trustees may be reimbursed for expenses of attendance, if any, at each
annual, regular or special meeting of the Trustees or of any committee thereof;
and for their expenses, if any, in connection with each property visit and any
other service or activity performed or engaged in as Trustees; but nothing
herein contained shall be construed to preclude any Trustees from serving the
Trust in any other capacity and receiving compensation therefor.

     (b)  Financial Assistance to Trustees.  The Trust may lend money to,
guarantee an obligation of or otherwise assist a Trustee or a trustee or
director of a direct or indirect subsidiary of the Trust; provided, however,
that such Trustee or other person is also an executive officer of the Trust or
of such subsidiary, or the loan, guarantee or other assistance is in connection
with the purchase of Shares.  The loan, guarantee or other assistance may be
with or without interest, unsecured, or secured in any manner that the Board of
Trustees approves, including a pledge of shares.

     Section 12.  REMOVAL OF TRUSTEES.  The shareholders may, at any time,
remove any Trustee in the manner provided in the Declaration of Trust.

     Section 13.  LOSS OF DEPOSITS.  No Trustee shall be liable for any loss
which may occur by reason of the failure of the bank, trust company, savings
and loan association, or other institution with whom moneys or shares have been
deposited.

     Section 14.  SURETY BONDS.  Unless required by law, no Trustee shall be
obligated to give any bond or surety or other security for the performance of
any of his duties.

     Section 15.  RELIANCE.  Each Trustee, officer, employee and agent of the
Trust shall, in the performance of his duties with respect to the Trust, be
fully justified and protected with regard to any act or failure to act in
reliance in good faith upon the books of account or other records of the Trust,
upon an opinion of counsel or upon reports made to the Trust by any of its
officers or employees or by the adviser, accountants, appraisers or other
experts or consultants selected by the Trustees or officers of the Trust,
regardless of whether such counsel or expert may also be a Trustee.

     Section 16.  INTERESTED TRUSTEE TRANSACTIONS.  Section 2-419 of the
Maryland General Corporation Law (the "MGCL") shall be available for and apply
to any contract or other transaction between the Trust and any of its Trustees
or between the Trust and any other trust, 


                                      8

<PAGE>   9

corporation, firm or other entity in which any of its Trustees is a trustee or
director or has a material financial interest.

     Section 17.  CERTAIN RIGHTS OF TRUSTEES, OFFICERS, EMPLOYEES AND AGENTS.
The Trustees shall have no responsibility to devote their full time to the
affairs of the Trust. Any Trustee or officer, employee or agent of the Trust
(other than a full-time officer, employee or agent of the Trust), in his
personal capacity or in a capacity as an affiliate, employee, or agent of any
other person, or otherwise, may have business interests and engage in business
activities similar or in addition to those of or relating to the Trust.)


                                   ARTICLE IV

                                   COMMITTEES

     Section 1.  NUMBER, TENURE AND QUALIFICATION.  The Trustees may appoint
from among its members an Audit Committee, a Compensation Committee and other
committees, each composed of at least three Trustees, to serve at the pleasure
of the Trustees.  A majority of the Trustees on the Compensation Committee and
all of the Trustees on the Audit Committee shall be Independent Trustees. In
addition, the Trustees may from time to time appoint from among its members a
Pricing Committee composed of one or more Trustees to serve at the pleasure of
the Trustees.

     Section 2.  POWERS.  The Trustees may delegate to committees appointed
under Section 1 of this Article any of the powers of the Trustees, except as
prohibited by law.

     Section 3.  MEETINGS.   In the absence of any member of any such
committee, the members thereof present at any meeting, whether or not they
constitute a quorum, may appoint another Trustee to act in the place of such
absent member.  Notice of committee meetings shall be given in the same manner
as notice for special meetings of the Board of Trustees.

     One-third, but not less than two (except for one-member committees), of
the members of any committee shall be present in person at any meeting of such
committee in order to constitute a quorum for the transaction of business at
such meeting, and the act of a majority present shall be the act of such
committee.  The Board of Trustees may designate a chairman of any committee,
and such chairman or any two members of any committee (except for one-member
committees) may fix the time and place of its meetings unless the Board shall
otherwise provide.  In the absence or disqualification of any member of any
such committee, the members thereof present at any meeting and not disqualified
from voting, whether or not they constitute a quorum, may unanimously appoint
another Trustee to act at the meeting in the place of such absent or
disqualified members.

     Each committee shall keep minutes of its proceedings and shall report the
same to the Board of Trustees at the next succeeding meeting, and any action by
the committee shall be subject to revision and alteration by the Board of
Trustees, provided that no rights of third persons shall be affected by any
such revision or alteration.

     Section 4.  TELEPHONE  MEETINGS.  Members of a committee of the Trustees
may participate in a meeting by means of a conference telephone or similar
communications 

                                      9

<PAGE>   10

equipment if all persons participating in the meeting can hear each other at 
the same time.  Participation in a meeting by these means shall constitute 
presence in person at the meeting.

     Section 5.  INFORMAL ACTION BY COMMITTEES.  Any action required or
permitted to be taken at any meeting of a committee of the Trustees may be
taken without a meeting, if a consent in writing to such action is signed by
each member of the committee and such written consent is filed with the minutes
of proceedings of such committee.

     Section 6.  VACANCIES.  Subject to the provisions hereof, the Board of
Trustees shall have the power at any time to change the membership of any
committee, to fill all vacancies, to designate alternate members to replace any
absent or disqualified member or to dissolve any such committee.


                                  ARTICLE V

                                  OFFICERS

     Section 1.  GENERAL PROVISIONS.  The officers of the Trust shall include a
president, a secretary and a treasurer and may include a chairman of the board,
a vice chairman of the board, a chief executive officer, a chief operating
officer, a chief financial officer, a chief legal counsel, one or more vice
presidents, one or more assistant secretaries and one or more assistant
treasurers.  In addition, the Trustees may from time to time appoint such other
officers with such powers and duties as they shall deem necessary or desirable.
The officers of the Trust shall be elected annually by the Trustees at the
first meeting of the Trustees held after each annual meeting of shareholders.
If the election of officers shall not be held at such meeting, such election
shall be held as soon thereafter as may be convenient.  Each officer shall hold
office until his successor is elected and qualifies or until his death,
resignation or removal in the manner hereinafter provided.  Any two or more
offices except president and vice president may be held by the same person.  In
their discretion, the Trustees may leave unfilled any office except that of
president and secretary.  Election of an officer or agent shall not of itself
create contract rights between the Trust and such officer or agent.

     Section 2.  REMOVAL AND RESIGNATION.  Any officer or agent of the Trust
may be removed by the Trustees if in their judgment the best interests of the
Trust would be served thereby, but such removal shall be without prejudice to
the contract rights, if any, of the person so removed.  Any officer of the
Trust may resign at any time by giving written notice of his resignation to the
Trustees, the chairman of the board, the president or the secretary.  Any
resignation shall take effect at any time subsequent to the time specified
therein or, if the time when it shall become effective is not specified
therein, immediately upon its receipt.  The acceptance of a resignation shall
not be necessary to make it effective unless otherwise stated in the
resignation.  Such resignation shall be without prejudice to the contract
rights, if any, of the Trust.

     Section 3.  VACANCIES.  A vacancy in any office may be filled by the
Trustees for the balance of the term.

     Section 4.  CHIEF EXECUTIVE OFFICER.  The Trustees may designate a chief
executive officer from among the elected officers. The chief executive officer
shall have 

                                     10

<PAGE>   11

responsibility for implementation of the policies of the Trust, as determined 
by the Trustees, and for the administration of the business affairs of the 
Trust.  In the absence of both the chairman and vice chairman of the board, the 
chief executive officer shall preside over the meetings of the Trustees and of 
the shareholders at which he shall be present.

     Section 5.  CHIEF OPERATING OFFICER.  The Trustees may designate a chief
operating officer from among the elected officers.  Said officer will have the
responsibilities and duties as set forth by the Trustees or the chief executive
officer.

     Section 6. CHIEF FINANCIAL OFFICER.  The Trustees may designate a chief
financial officer from among the elected officers.  Said officer will have the
responsibilities and duties as set forth by the Trustees or the chief executive
officer.

     Section 7.  CHIEF LEGAL COUNSEL.  The Trustees may designate a chief legal
counsel from among the elected officers.  Said officer will have the
responsibilities and duties as set forth by the trustees or the chief executive
officer.

     Section 8.  CHAIRMAN AND VICE CHAIRMAN OF THE BOARD.  The chairman of the
board shall preside over the meetings of the Trustees and of the shareholders
at which he shall be present and shall in general oversee all of the business
and affairs of the Trust.  In the absence of the chairman of the board, the
vice chairman of the board shall preside at such meetings at which he shall be
present.  The chairman and the vice chairman of the board may execute any deed,
mortgage, bond, contract or other instrument, except in cases where the
execution thereof shall be expressly delegated by the Trustees or by these
Bylaws to some other officer or agent of the Trust or shall be required by law
to be otherwise executed.  The chairman of the board and the vice chairman of
the board shall perform such other duties as may be assigned to him or them by
the Trustees.

     Section 9.  PRESIDENT.  In the absence of the chairman, the vice chairman
of the board and the chief executive officer, the president shall preside over
the meetings of the Trustees and of the shareholders at which he shall be
present.  In the absence of a designation of a chief executive officer by the
Trustees, the president shall be the chief executive officer and shall be ex
officio a member of all committees that may, from time to time, be constituted
by the Trustees.  The president may execute any deed, mortgage, bond, contract
or other instrument, except in cases where the execution thereof shall be
expressly delegated by the Trustees or by these Bylaws to some other officer or
agent of the Trust or shall be required by law to be otherwise executed; and in
general shall perform all duties incident to the office of president and such
other duties as may be prescribed by the Trustees from time to time.

     Section 10.  VICE PRESIDENTS.  In the absence of the president or in the
event of a vacancy in such office, the vice president (or in the event there be
more than one vice president, the vice presidents in the order designated at
the time of their election or, in the absence of any designation, then in the
order of their election) shall perform the duties of the president and when so
acting shall have all the powers of and be subject to all the restrictions upon
the president; and shall perform such other duties as from time to time may be
assigned to him by the president or by the Trustees.  The Trustees may
designate one or more vice presidents as executive vice president, senior vice
president or as vice president for particular areas of responsibility.

                                     11


<PAGE>   12

     Section 11.  SECRETARY.  The secretary shall (a) keep the minutes of the
proceedings of the shareholders, the Trustees and committees of the Trustees in
one or more books provided for that purpose; (b) see that all notices are duly
given in accordance with the provisions of these Bylaws or as required by law;
(c) be custodian of the trust records and of the seal of the Trust; (d) keep a
register of the post office address of each shareholder which shall be
furnished to the secretary by such shareholder; (e) have general charge of the
share transfer books of the Trust; and (f) in general perform such other duties
as from time to time may be assigned to him by the chief executive officer, the
president or by the Trustees.

     Section 12.  TREASURER.  The treasurer shall have the custody of the funds
and securities of the Trust and shall keep full and accurate accounts of
receipts and disbursements in books belonging to the Trust and shall deposit
all moneys and other valuable effects in the name and to the credit of the
Trust in such depositories as may be designated by the Trustees.

     He shall disburse the funds of the Trust as may be ordered by the
Trustees, taking proper vouchers for such disbursements, and shall render to
the president and Trustees, at the regular meetings of the Trustees or whenever
they may require it, an account of all his transactions as treasurer and of the
financial condition of the Trust.

     If required by the Trustees, he shall give the Trust a bond in such sum
and with such surety or sureties as shall be satisfactory to the Trustees for
the faithful performance of the duties of his office and for the restoration to
the Trust, in case of his death, resignation, retirement or removal from
office, of all books, papers, vouchers, moneys and other property of whatever
kind in his possession or under his control belonging to the Trust.

     Section 13.  ASSISTANT SECRETARIES AND ASSISTANT TREASURERS.  The
assistant secretaries and assistant treasurers, in general, shall perform such
duties as shall be assigned to them by the secretary or treasurer,
respectively, or by the president or the Trustees.  The assistant treasurers
shall, if required by the Trustees, give bonds for the faithful performance of
their duties in such sums and with such surety or sureties as shall be
satisfactory to the Trustees.

     Section 14.  SALARIES.  The salaries and other compensation of the
officers shall be fixed from time to time by the Trustees and no officer shall
be prevented from receiving such salary or other compensation by reason of the
fact that he is also a Trustee.

                                   ARTICLE VI

                     CONTRACTS, LOANS, CHECKS AND DEPOSITS

     Section 1.  CONTRACTS.  The Trustees may authorize any officer or agent to
enter into any contract or to execute and deliver any instrument in the name of
and on behalf of the Trust and such authority may be general or confined to
specific instances.  Any agreement, deed, mortgage, lease or other document
executed by one or more of the Trustees or by an authorized person shall be
valid and binding upon the Trustees and upon the Trust when authorized or
ratified by action of the Trustees.

                                     12


<PAGE>   13

     Section 2.  CHECKS AND DRAFTS.  All checks, drafts or other orders for the
payment of money, notes or other evidences of indebtedness issued in the name
of the Trust shall be signed by such officer or agent of the Trust in such
manner as shall from time to time be determined by the Trustees.

     Section 3.  DEPOSITS.  All funds of the Trust not otherwise employed shall
be deposited from time to time to the credit of the Trust in such banks, trust
companies or other depositories as the Trustees may designate.


                                  ARTICLE VII

                                     SHARES

     Section 1.  CERTIFICATES.  Each shareholder shall be entitled to a
certificate or certificates which shall represent and certify the number of
shares of each class of beneficial interest held by him in the Trust.  Each
certificate shall be signed by the chief executive officer, the president or a
vice president and countersigned by the secretary or an assistant secretary or
the treasurer or an assistant treasurer and may be sealed with the seal, if
any, of the Trust.  The signatures may be either manual or facsimile.
Certificates shall be consecutively numbered; and if the Trust shall, from time
to time, issue several classes of shares, each class may have its own number
series.  A certificate is valid and may be issued whether or not an officer who
signed it is still an officer when it is issued.  Each certificate representing
shares which are restricted as to their transferability or voting powers, which
are preferred or limited as to their dividends or as to their allocable portion
of the assets upon liquidation or which are redeemable at the option of the
Trust, shall have a statement of such restriction, limitation, preference or
redemption provision, or a summary thereof, plainly stated on the certificate.
In lieu of such statement or summary, the Trust may set forth upon the face or
back of the certificate a statement that the Trust will furnish to any
shareholder, upon request and without charge, a full statement of such
information.

     Section 2.  TRANSFERS.  Certificates shall be treated as negotiable and
title thereto and to the shares they represent shall be transferred by delivery
thereof to the same extent as those of a Maryland stock corporation.  Upon
surrender to the Trust or the transfer agent of the Trust of a share
certificate duly endorsed or accompanied by proper evidence of succession,
assignment or authority to transfer, the Trust shall issue a new certificate to
the person entitled thereto, cancel the old certificate and record the
transaction upon its books.

     The Trust shall be entitled to treat the holder of record of any share or
shares as the holder in fact thereof and, accordingly, shall not be bound to
recognize any equitable or other claim to or interest in such share or shares
on the part of any other person, whether or not it shall have express or other
notice thereof, except as otherwise provided by the laws of the State of
Maryland.

     Notwithstanding the foregoing, transfers of shares of beneficial interest
of the Trust will be subject in all respects to the Declaration of Trust and
all of the terms and conditions contained therein.


                                     13


<PAGE>   14

     Section 3.  REPLACEMENT CERTIFICATE.  Any officer designated by the
Trustees may direct a new certificate to be issued in place of any certificate
previously issued by the Trust alleged to have been lost, stolen or destroyed
upon the making of an affidavit of that fact by the person claiming the
certificate to be lost, stolen or destroyed.  When authorizing the issuance of
a new certificate, an officer designated by the Trustees may, in his discretion
and as a condition precedent to the issuance thereof, require the owner of such
lost, stolen or destroyed certificate or the owner's legal representative to
advertise the same in such manner as he shall require and/or to give bond, with
sufficient surety, to the Trust to indemnify it against any loss or claim
which may arise as a result of the issuance of a new certificate.

     Section 4.  CLOSING OF TRANSFER BOOKS OR FIXING OF RECORD DATE.  The
Trustees may set, in advance, a record date for the purpose of determining
shareholders entitled to notice of or to vote at any meeting of shareholders or
determining shareholders entitled to receive payment of any dividend or the
allotment of any other rights, or in order to make a determination of
shareholders for any other proper purpose.  Such date, in any case, shall not
be prior to the close of business on the day the record date is fixed and shall
be not more than 90 days and, in the case of a meeting of shareholders not less
than ten days, before the date on which the meeting or particular action
requiring such determination of shareholders of record is to be held or taken.

     In lieu of fixing a record date, the Trustees may provide that the share
transfer books shall be closed for a stated period but not longer than 20 days.
If the share transfer books are closed for the purpose of determining
shareholders entitled to notice of or to vote at a meeting of shareholders,
such books shall be closed for at least ten days before the date of such
meeting.

     If no record date is fixed and the share transfer books are not closed for
the determination of shareholders, (a) the record date for the determination of
shareholders entitled to notice of or to vote at a meeting of shareholders
shall be at the close of business on the day on which the notice of meeting is
mailed or the 30th day before the meeting, whichever is the closer date to the
meeting; and (b) the record date for the determination of shareholders entitled
to receive payment of a dividend or an allotment of any other rights shall be
the close of business on the day on which the resolution of the Trustees,
declaring the dividend or allotment of rights, is adopted.

     When a determination of shareholders entitled to vote at any meeting of
shareholders has been made as provided in this section, such determination
shall apply to any adjournment thereof, except when (i) the determination has
been made through the closing of the transfer books and the stated period of
closing has expired or (ii) the meeting is adjourned to a date more than 120
days after the record date fixed for the original meeting, in either of which
case a new record date shall be determined as set forth herein.

     Section 5.  STOCK LEDGER.  The Trust shall maintain at its principal
office or at the office of its counsel, accountants or transfer agent, an
original or duplicate share ledger containing the name and address of each
shareholder and the number of shares of each class held by such shareholder.

     Section 6.  FRACTIONAL SHARES; ISSUANCE OF UNITS.  The Trustees may issue
fractional shares or provide for the issuance of scrip, all on such terms and
under such 

                                     14

<PAGE>   15

conditions as they may determine.  Notwithstanding any other provision of the 
Declaration of Trust or these Bylaws, the Trustees may issue units consisting 
of different securities of the Trust.  Any security issued in a unit shall 
have the same characteristics as any identical securities issued by the Trust, 
except that the Trustees may provide that for a specified period securities of 
the Trust issued in such unit may be transferred on the books of the Trust only 
in such unit.


                                ARTICLE VIII

                               ACCOUNTING YEAR

     The Trustees shall have the power, from time to time, to fix the fiscal
year of the Trust by a duly adopted resolution.


                                 ARTICLE IX

                                DISTRIBUTIONS

     Section 1.  AUTHORIZATION.  Dividends and other distributions upon the
shares of beneficial interest of the Trust may be authorized and declared by
the Trustees, subject to the provisions of law and the Declaration of Trust.
Dividends and other distributions may be paid in cash, property or shares of
the Trust, subject to the provisions of law and the Declaration of Trust.

     Section 2.  CONTINGENCIES.  Before payment of any dividends or other
distributions, there may be set aside out of any funds of the Trust available
for dividends or other distributions such sum or sums as the Trustees may from
time to time, in their absolute discretion, think proper as a reserve fund for
contingencies, for equalizing dividends or other distributions, for repairing
or maintaining any property of the Trust or for such other purpose as the
Trustees shall determine to be in the best interest of the Trust, and the
Trustees may modify or abolish any such reserve in the manner in which it was
created.


                                   ARTICLE X

                     PROHIBITED INVESTMENTS AND ACTIVITIES;
                              INVESTMENT POLICIES

     Notwithstanding anything to the contrary in the Declaration of Trust, the
Trust shall not enter into any transaction referred to in (i), (ii) or (iii)
below which it does not believe is in the best interests of the Trust, and will
not, without the approval of a majority of the disinterested Trustees, (i)
acquire from or sell to any Trustee, officer or employee of the Trust, any
corporation, partnership, joint venture, trust, employee benefit plan or other
enterprise in which a Trustee, officer or employee of the Trust owns more than
a one percent interest or any affiliate of any of the foregoing, any of the
assets or other property of the Trust, except for the acquisition directly or
indirectly of certain properties or interest therein, directly or indirectly,
through entities in which it owns an interest in connection with the initial
public offering of 

                                     15

<PAGE>   16

shares by the Trust or pursuant to agreements entered into in connection with
such offering, which properties shall be described in the prospectus relating
to such initial public offering, (ii) make any loan to or borrow from any of
the foregoing persons or (iii) engage in any other transaction with any of the
foregoing persons. Each such transaction will be in all respects on such terms
as are, at the time of the transaction and under the circumstances then
prevailing, fair and reasonable to the Trust.  Subject to the foregoing and the
provisions of the Declaration of Trust, the Board of Trustees may from time to
time adopt, amend, revise or terminate any policy or policies with respect
to investments by the Trust as it shall deem appropriate in its sole
discretion.


                                   ARTICLE XI

                                      SEAL

     Section 1.  SEAL.  The Trustees may authorize the adoption of a seal by
the Trust.  The seal shall have inscribed thereon the name of the Trust and the
year of its formation.  The Trustees may authorize one or more duplicate seals
and provide for the custody thereof.

     Section 2.  AFFIXING SEAL.  Whenever the Trust is permitted or required to
affix its seal to a document, it shall be sufficient to meet the requirements
of any law, rule or regulation relating to a seal to place the word "(SEAL)"
adjacent to the signature of the person authorized to execute the document on
behalf of the Trust.


                                  ARTICLE XII

                    INDEMNIFICATION AND ADVANCE OF EXPENSES

     To the maximum extent permitted by Maryland law in effect from time to
time, the Trust shall indemnify (a) any Trustee, officer or shareholder or any
former Trustee, officer or shareholder (including among the foregoing, for all
purposes of this Article XII and without limitation, any individual who, while
a Trustee, officer or shareholder and at the express request of the Trust,
serves or has served another corporation, partnership, joint venture, trust,
employee benefit plan or any other enterprise as a director, officer,
shareholder, partner or trustee of such corporation, partnership, joint
venture, trust, employee benefit plan or other enterprise) who has been
successful, on the merits or otherwise, in the defense of a proceeding to which
he was made a party by reason of service in such capacity, against reasonable
expenses incurred by him in connection with the proceeding, (b) any Trustee or
officer or any former Trustee or officer against any claim or liability to
which he may become subject by reason of such status unless it is established
that (i) his act or omission was material to the matter giving rise to the
proceeding and was committed in bad faith or was the result of active and
deliberate dishonesty, (ii) he actually received an improper personal benefit
in money, property or services or (iii) in the case of a criminal proceeding,
he had reasonable cause to believe that his act or omission was unlawful and
(c) each shareholder or former shareholder against any claim or liability to
which he may become subject by reason of such status.  In addition, the Trust
shall, without requiring a preliminary determination of the ultimate
entitlement to indemnification, pay or reimburse, in advance of final
disposition of a proceeding, reasonable expenses incurred by a Trustee, officer
or shareholder or former Trustee, officer or shareholder 

                                     16

<PAGE>   17

made a party to a proceeding by reason such status, provided that, in the case
of a Trustee or officer, the Trust shall have received (i) a written
affirmation by the Trustee or officer of his good faith belief that he has met
the applicable standard of conduct necessary for indemnification by the Trust
as authorized by these Bylaws and (ii) a written undertaking by or on his
behalf to repay the amount paid or reimbursed by the Trust if it shall
ultimately be determined that the applicable standard of conduct was not met. 
The Trust may, with the approval of its Trustees, provide such indemnification
or payment or reimbursement of expenses to any Trustee, officer or shareholder
or any former Trustee, officer or shareholder who served a predecessor of the
Trust and to any employee or agent of the Trust or a predecessor of the Trust. 
Neither the amendment nor repeal of this Article, nor the adoption or amendment
of any other provision of the Declaration of Trust or these Bylaws inconsistent
with this Article, shall apply to or affect in any respect the applicability of
this Article with respect to any act or failure to act which occurred prior to 
such amendment, repeal or adoption.

     Any indemnification or payment or reimbursement of the expenses permitted
by these Bylaws shall be furnished in accordance with the procedures provided
for indemnification or payment or reimbursement of expenses, as the case may
be, under Section 2-418 of the MGCL for directors of Maryland corporations.
The Trust may provide to Trustees, officers and shareholders such other and
further indemnification or payment or reimbursement of expenses, as the case
may be, to the fullest extent permitted by the MGCL, as in effect from time to
time, for directors of Maryland corporations.


                                  ARTICLE XIII

                                WAIVER OF NOTICE

     Whenever any notice is required to be given pursuant to the Declaration of
Trust or Bylaws or pursuant to applicable law, a waiver thereof in writing,
signed by the person or persons entitled to such notice, whether before or
after the time stated therein, shall be deemed equivalent to the giving of such
notice.  Neither the business to be transacted at nor the purpose of any
meeting need be set forth in the waiver of notice, unless specifically required
by statute.  The attendance of any person at any meeting shall constitute a
waiver of notice of such meeting, except where such person attends a meeting
for the express purpose of objecting to the transaction of any business on the
ground that the meeting is not lawfully called or convened.


                                  ARTICLE XIV

                              AMENDMENT OF BYLAWS

     The Trustees shall have the power to adopt, alter or repeal any provision
of these Bylaws and to make new Bylaws; provided, however, that Article II,
Section 2 of Article III and this Article XIV of these Bylaws shall not be
amended without the consent of shareholders by a vote of a majority of the
votes cast at a meeting of shareholders duly called and at which a quorum is
present.


                                     17


<PAGE>   18

                                   ARTICLE XV

                                 MISCELLANEOUS

     All references to the Declaration of Trust shall include any amendments
thereto.













                                     18


<PAGE>   1
                                                                    EXHIBIT 3.3

                       EQUITY OFFICE PROPERTIES TRUST

                           ARTICLES SUPPLEMENTARY

                     ESTABLISHING AND FIXING THE RIGHTS AND
                  PREFERENCES OF A SERIES OF PREFERRED SHARES

         Equity Office Properties Trust, a Maryland real estate investment
trust (the "Trust"), certifies to the State Department of Assessments and
Taxation of Maryland that:

         FIRST:  Under a power contained in Article VI of the Trust's Articles
of Amendment and Restatement of Declaration of Trust (the "Declaration of
Trust") the Board of Trustees (the "Board"), by resolution duly adopted on
November 13, 1997, classified and designated 8,000,000 Preferred Shares (as
defined in the Declaration of Trust) as 8.98% Series A Cumulative Redeemable
Preferred Shares, with the preferences, conversion and other rights, voting
powers, restrictions, limitations as to distributions, qualifications and terms
and conditions of redemption of shares as follows:

(1)      Designation and Number.  A series of Preferred Shares, designated the
"8.98% Series A Cumulative Redeemable Preferred Shares" (the "Series A
Preferred Shares"), is hereby established.  The number of Series A Preferred
Shares shall be 8,000,000.

(2)      Rank.  The Series A Preferred Shares will, with respect to
distribution rights and rights upon liquidation, dissolution or winding up of
the Trust, rank (a) senior to all classes or series of Common Shares (as
defined in the Declaration of Trust), and to all equity securities ranking
junior to such Series A Preferred Shares; (b) on a parity with all equity
securities issued by the Trust the terms of which specifically provide that
such equity securities rank on a parity with the Series A Preferred Shares; and
(c) junior to all equity securities issued by the Trust the terms of which
specifically provide that such equity securities rank senior to the Series A
Preferred Shares.  The term "equity securities" shall not include convertible
debt securities.

(3)      Distributions.

         (a)     Holders of Series A Preferred Shares shall be entitled to
receive, when and as authorized by the Board, out of funds legally available
for the payment of distributions, cumulative preferential cash distributions at
the rate of 8.98% of the $25.00 liquidation preference per annum (equivalent to
a fixed annual amount of $2.245 per share).  Such distributions shall be
cumulative from the last date on which any distributions were paid with respect
to the shares of 8.98% Series A Cumulative Redeemable Preferred Stock of Beacon
Properties Corporation ("Beacon") for which the Series A Preferred Shares were
exchanged in connection with the merger of Beacon with and into the Trust and
shall be payable quarterly in arrears on or before


<PAGE>   2

March 15, June 15, September 15 and December 15 of each year or, if not a
business day, the next succeeding business day (each a "Distribution Payment
Date").  Any distribution payable on the Series A Preferred Shares for any
partial distribution period will be computed on the basis of a 360-day year
consisting of twelve 30-day months.  Distributions will be payable to holders
of record as they appear in the share records of the Trust at the close of
business on the applicable record date, which shall be the first day of the
calendar month in which the applicable Distribution Payment Date falls on or
such other date designated by the Board for the payment of distributions that
is not more than 30 nor less than 10 days prior to such Distribution Payment
Date (each a "Distribution Record Date").

         (b)     No distributions on Series A Preferred Shares shall be
authorized by the Board or paid or set apart for payment by the Trust at such
time as the terms and provisions of any agreement of the Trust, including any
agreement relating to its indebtedness, prohibits such authorization, payment
or setting apart for payment or provides that such authorization, payment or
setting apart for payment would constitute a breach thereof, or a default
thereunder, or if such authorization or payment shall be restricted or
prohibited by law.

         (c)     Notwithstanding the foregoing, dividends on the Series A
Preferred Shares will accrue whether or not the terms and provisions set forth
in Section 3(b) hereof at any time prohibit the current payment of
distributions, whether or not the Trust has earnings, whether or not there are
funds legally available for the payment of such distributions and whether or
not such distributions are authorized. Accrued but unpaid distributions on the
Series A Preferred Shares will accumulate as of the Distribution Payment Date
on which they first become payable.

         (d)     When distributions are not paid in full (or a sum sufficient
for such full payment is not so set apart) upon the Series A Preferred Shares
and any other series of Preferred Shares ranking on a parity as to
distributions with the Series A Preferred Shares, all distributions authorized
upon the Series A Preferred Shares and any other series of Preferred Shares
ranking on a parity as to distributions with the Series A Preferred Shares
shall be authorized pro rata so that the amount of distributions authorized per
share of Series A Preferred Shares and such other series of Preferred Shares
shall in all cases bear to each other the same ratio that accrued distributions
per share on the Series A Preferred Shares and such other series of Preferred
Shares (which shall not include any accrual in respect of unpaid distributions
for prior distribution periods if such Preferred Shares do not have a
cumulative distribution) bear to each other.  No interest, or sum of money in
lieu of interest, shall be payable in respect of any distribution payment or
payments on Series A Preferred Shares which may be in arrears.

         (e)     Except as provided in the immediately preceding paragraph,
unless full cumulative distributions on the Series A Preferred Shares have been
or contemporaneously are authorized and paid or authorized and a sum sufficient
for the payment thereof is set apart for payment for all past distribution
periods and the then current distribution period, no distributions (other than
in Common Shares or other





                                       2
<PAGE>   3

shares of the Trust ranking junior to the Series A Preferred Shares as to
distributions and upon liquidation) shall be authorized or paid or set aside
for payment nor shall any other distribution be authorized or made upon the
Common Shares, or any other shares of the Trust ranking junior to or on a
parity with the Series A Preferred Shares as to distributions or upon
liquidation, nor shall any Common Shares, or any other shares of the Trust
ranking junior to or on a parity with the Series A Preferred Shares as to
distributions or upon liquidation be redeemed, purchased or otherwise acquired
for any consideration (or any moneys be paid to or made available for a sinking
fund for the redemption of any such shares) by the Trust (except by conversion
into or exchange for other shares of the Trust ranking junior to the Series A
Preferred Shares as to distributions and upon liquidation).

         (f)     Holders of the Series A Preferred Shares shall not be entitled
to any distribution, whether payable in cash, property or shares in excess of
full cumulative distributions on the Series A Preferred Shares as described
above.  Any distribution payment made on the Series A Preferred Shares shall
first be credited against the earliest accrued but unpaid distribution due with
respect to such shares which remains payable.

(4)      Liquidation Preference.

         (a)     Upon any voluntary or involuntary liquidation, dissolution or
winding up of the affairs of the Trust, the holders of Series A Preferred
Shares then outstanding are entitled to be paid out of the assets of the Trust
legally available for distribution to its shareholders a liquidation preference
of $25.00 per share, plus an amount equal to any accrued and unpaid
distributions to the date of payment, before any distribution of assets is made
to holders of Common Shares or any other class or series of shares of the Trust
that ranks junior to the Series A Preferred Shares as to liquidation rights.

         (b)     In the event that, upon any such voluntary or involuntary
liquidation, dissolution or winding up, the available assets of the Trust are
insufficient to pay the amount of the liquidating distributions on all
outstanding shares of Series A Preferred Shares and the corresponding amounts
payable on all shares of the Trust of other classes or series ranking on a
parity with the Series A Preferred Shares in the distribution of assets, then
the holders of the Series A Preferred Shares and all other such classes or
series of stock shall share ratably in any such distribution of assets in
proportion to the full liquidating distributions to which they would otherwise
be respectively entitled.

         (c)     Written notice of any such liquidation, dissolution or winding
up of the Trust, stating the payment date or dates when, and the place or
places where, the amounts distributable in such circumstances shall be payable,
shall be given by first class mail, postage pre- paid, not less than 30 nor
more than 60 days prior to the payment date stated therein, to each record
holder of the Series A Preferred Shares at the respective addresses of such
holders as the same shall appear on the share transfer records of the Trust.





                                       3
<PAGE>   4

         (d)     After payment of the full amount of the liquidating
distributions to which they are entitled, the holders of Series A Preferred
Shares will have no right or claim to any of the remaining assets of the Trust.

         (e)     The consolidation or merger of the Trust with or into any
other corporation, trust or entity or of any other corporation, trust or other
entity with or into the Trust or the sale, lease or conveyance of all or
substantially all of, the property or business of the Trust, shall not be
deemed to constitute a liquidation, dissolution or winding up of the Trust.

(5)      Redemption.

         (a)     Right of Optional Redemption.  The Series A Preferred Shares
are not redeemable prior to June 15, 2002.  However, in order to ensure that
the Trust remains a qualified real estate investment trust ("REIT") for federal
income tax purposes, the Series A Preferred Shares will be subject to the
provisions of Article VII of the Declaration of Trust pursuant to which Series
A Preferred Shares owned by a shareholder in excess of the Ownership Limit, (as
defined in Article VII of the Declaration of Trust) will automatically be
transferred to a Charitable Trust (as defined in Article VII of the Declaration
of Trust) and the Trust will have the right to purchase such shares, as
provided in Article VII of the Declaration of Trust.  On and after June 15,
2002, the Trust, at its option and upon not less than 30 nor more than 60 days'
written notice, may redeem the Series A Preferred Shares, in whole or in part,
at any time or from time to time, for cash at a redemption price of $25.00 per
share, plus all accrued and unpaid distributions thereon to the date fixed for
redemption, without interest.  If less than all of the outstanding Series A
Preferred Shares are to be redeemed, the Series A Preferred Shares to be
redeemed shall be selected pro rata (as nearly as may be practicable without
creating fractional shares) or by any other equitable method determined by the
Trust.

         (b)     Limitations on Redemption.

                 (i)      The redemption price of the Series A Preferred Shares
(other than the portion thereof consisting of accrued and unpaid distributions)
is payable solely out of the sale proceeds of other shares of the Trust,
which may include other series of Preferred Shares, and from no other source.
For purposes of the preceding sentence, "shares" means any equity securities
(including Common Shares and Preferred Shares), shares, interest, participation
or other ownership interests (however designated) and any rights (other than
debt securities convertible into or exchangeable for equity securities) or
options to purchase any of the foregoing.

                 (ii)     Unless full cumulative distributions on all Series A
Preferred Shares shall have been or contemporaneously are authorized and paid
or authorized and a sum sufficient for the payment thereof set apart for
payment for all past distribution periods and the then current distribution
period, no Series A Preferred Shares shall be redeemed unless all outstanding
Series A Preferred Shares are simultaneously redeemed, and the Trust shall not
purchase or otherwise acquire





                                      4
<PAGE>   5

directly or indirectly any Series A Preferred Shares (except by and upon
liquidation); provided, however, that the foregoing shall not prevent the
purchase by the Trust of Series A Preferred Shares pursuant to Article VII of
the Declaration of Trust or otherwise in order to ensure that the Trust remains
qualified as a REIT for Federal income tax purposes or the purchase or
acquisition of Series A Preferred Shares pursuant to a purchase or exchange
offer made on the same terms to holders of all outstanding Series A Preferred
Shares.

         (c)     Rights to Distributions on Shares Called for Redemption.
Immediately prior to any redemption of Series A Preferred Shares, the Trust
shall pay, in cash, any accumulated and unpaid distributions through the
redemption date, unless a redemption date falls after a Distribution Record
Date and prior to the corresponding Distribution Payment Date, in which case
each holder of Series A Preferred Shares at the close of business on such
Distribution Record Date shall be entitled to the distribution payable on such
shares on the corresponding Distribution Payment Date notwithstanding the
redemption of such shares before Distribution Payment Date.  Except as provided
above, the Trust will make no payment or allowance for unpaid distributions,
whether or not in arrears, on Series A Preferred Shares for which a notice of
redemption has been given.


         (d)     Procedures for Redemption.

                 (i)      Notice of redemption will be (a) given by publication
in a newspaper of general circulation in the City of New York, such publication
to be made once a week for two successive weeks commencing not less than 30 nor
more than 60 days prior to the redemption date.  A similar notice will be
mailed by the Trust, postage prepaid, no less than 30 nor more than 60 days
prior to the redemption date, addressed to the respective holders of record of
the Series A Preferred Shares to be redeemed at their respective addresses as
they appear on the share transfer records of the Trust.  No failure to give
such notice or any defect thereto or in the mailing thereof shall affect the
validity of the proceedings for the redemption of any Series A Preferred Shares
except as to the holder to whom notice was defective or not given.

                 (ii)     In addition to any information required by law or by
the applicable rules of any exchange upon which the Series A Preferred Shares
may be listed or admitted to trading, such notice shall state:  (A) the
redemption date; (B) the redemption price; (C) the number of Series A Preferred
Shares to be redeemed; (D) the place or places where the Series A Preferred
Shares are to be surrendered for payment of the redemption price; (E) that
distributions on the shares to be redeemed will cease to accrue on such
redemption date.  If less than all of the Series A Preferred Shares held by any
holder are to be redeemed, the notice mailed to such holder shall also specify
the number of Series A Preferred Shares held by such holder to be redeemed.

                 (iii)    If notice of redemption of any Series A Preferred
Shares has been given and if the funds necessary for such redemption have been
set aside by the Trust in trust for the benefit of the holders of any Series A
Preferred Shares so called for redemption, then from and after the redemption
date distributions will cease to accrue





                                       5
<PAGE>   6

on such Series A Preferred Shares, such Series A Preferred Shares shall no
longer be deemed outstanding and all rights of the holders of such shares will
terminate, except the right to receive the redemption price.  Holders of Series
A Preferred Shares to be redeemed shall surrender such Series A Preferred
Shares at the place designated in such notice and, upon surrender in accordance
with said notice of the certificates for the Series A Preferred Shares so
redeemed (properly endorsed or assigned for transfer, if the Trust shall so
require and the notice shall so state), such Series A Preferred Shares shall be
redeemed by the Trust at the redemption price plus any accrued and unpaid
distributions payable upon such redemption.  In case less than all the Series A
Preferred Shares represented by any such certificates are redeemed, a new
certificate or certificates shall be issued representing the unredeemed Series
A Preferred Shares without cost to the holder thereof.

         (e)     Status of Redeemed Shares.  Any Series A Preferred Shares that
shall at any time have been redeemed shall, after such redemption, have the
status of authorized but unissued Preferred Shares, without designation as to
series until such shares are once more designated as part of a particular
series by the Board.

(6)      Voting Rights.

         (a)     Holders of the Series A Preferred Shares will not have any
voting rights, except as set forth below.

         (b)     Whenever distributions on any Series A Preferred Shares shall
be in arrears for six or more quarterly periods (a "Preferred Distribution
Default"), the holders of such Series A Preferred Shares (voting separately as
a class with all other series of Preferred Shares ranking on a parity with the
Series A Preferred Shares as to distributions or on liquidation ("Parity
Preferred Shares") upon which like voting rights have been conferred and are
exercisable) will be entitled to vote for the election of a total of two
additional trustees of the Trust (the "Preferred Share Trustees") at a special
meeting called by the holders of record of at least 20% of the outstanding
Series A Preferred Shares or the holders of shares of any other series of
Parity Preferred Shares so in arrears (unless such request is received less
than 90 days before the date fixed for the next annual or special meeting of
shareholders) or at the next annual meeting of shareholders, and at each
subsequent annual meeting until all distributions accumulated on such shares of
Series A Preferred Shares for the past dividend periods and the distribution
for the then current distribution period shall have been fully paid or
authorized and a sum sufficient for the payment thereof set aside for payment
in full.

         (c)     If and when all accumulated distributions and the distribution
for the current distribution period on the Series A Preferred Shares shall have
been paid in full or set aside for payment in full, the holders of Series A
Preferred Shares shall be divested of the voting rights set forth in Section
6(b) hereof (subject to revesting in the event of each and every Preferred
Distribution Default) and, if all accumulated distributions and the
distribution for the current distribution period have been paid in full or set
aside for payment in full on all other series of Parity Preferred Shares upon






                                       6
<PAGE>   7
which like voting rights have been conferred and are exercisable, the
term of office of each Preferred Share Trustee so elected shall terminate.  Any
Preferred Share Trustee may be removed at any time with or without cause by the
vote of, and shall not be removed otherwise than by the vote of, the holders of
record of a majority of the outstanding Series A Preferred Shares when they
have the voting rights set forth in Section 6(b) (voting separately as a class
with all other series of Parity Preferred Shares upon which like voting rights
have been conferred and are exercisable)  So long as a Preferred Distribution
Default shall continue, any vacancy in the office of a Preferred Share Trustee
may be filled by written consent of the Preferred Stock Trustee remaining in
office, or if none remains in office, by a vote of the holders of record of a
majority of the outstanding Series A Preferred Shares when they have the voting
rights set forth in Section 6(b) (voting separately as a class with all other
series of Parity Preferred Shares upon which like voting rights have been
conferred and are exercisable).  The Preferred Share Trustees shall each be
entitled to one vote per director on any matter.

         (d)     So long as any Series A Preferred Shares remain outstanding,
the Trust shall not, without the affirmative vote of the holders of at least
two thirds of the Series A Preferred Shares outstanding at the time, (i)
authorize or create, or increase the authorized or issued amount of, any class
or series of shares ranking prior to the Series A Preferred Shares with respect
to payment of distributions or the distribution of assets upon liquidation,
dissolution or winding up or reclassify any authorized shares of the Trust into
any such shares, or create, authorize or issue any obligations or security
convertible into or evidencing the right to purchase any such shares or (ii)
amend, alter or repeal the provisions of the Declaration of Trust, whether by
merger, consolidation or otherwise, so as to materially and adversely affect
any right, preferences, privileges or voting power of the Series A Preferred
Shares or the holders thereof; provided, however, that with respect to the
occurrence of any event set forth in (ii) above, so long as the Series A
Preferred Shares remain outstanding with the terms thereof materially
unchanged, the occurrence of any such event shall not be deemed to materially
and adversely affect such rights, preferences, privileges or voting powers of
the holders of the Series A Preferred Shares and provided further that any
increase in the amount of the authorized Preferred Shares or the creation or
issuance of any other series of Preferred Shares, or any increase in the amount
of authorized shares of each series, in each case ranking on a parity with or
junior to the Series A Preferred Shares with respect to payment of
distributions or the distribution of assets upon liquidation, dissolution or
winding up, shall not be deemed to materially and adversely affect such rights,
preferences, privileges or voting powers.

         (e)     The foregoing voting provisions will not apply if, at or prior
to the time when the act with respect to which such vote would otherwise be
required shall be effected, all outstanding Series A Preferred Shares shall
have been redeemed or called for redemption upon proper notice and sufficient
funds shall have been deposited in trust to effect such redemption.





                                       7
<PAGE>   8

(7)      Conversion.  The Series A Preferred Shares are not convertible into or
exchangeable for any other property or securities of the Trust.

(8)      Application of Article VII.  The Series A Preferred Shares are subject
to the provisions of Article VII of the Declaration of Trust.

         SECOND:  The Series A Preferred Shares have been classified and
designated by the Board under the authority contained in the Declaration of
Trust.

         THIRD:  These Articles Supplementary have been approved by the Board
in the manner and by the vote required by law.

         FOURTH:  These Articles Supplementary shall be effective at the time
the State Department of Assessments and Taxation of Maryland accepts these
Articles Supplementary for record.

         FIFTH:  The undersigned President of the Trust acknowledges these
Articles Supplementary to be the act of the Trust and, as to all matters or
facts required to be verified under oath, the undersigned President
acknowledges that to the best of his knowledge, information and belief, these
matters and facts are true in all material respects and that this statement is
made under the penalties for perjury.

         IN WITNESS WHEREOF, the Trust has caused these Articles Supplementary
to be executed under seal in its name and on its behalf by its President and
attested to by its Secretary on this ___ th day of __________, 1997.

                                        EQUITY OFFICE PROPERTIES TRUST

                                        By:
                                           -------------------------------------
                                           Timothy H. Callahan
                                           President and Chief Executive Officer
[SEAL]

ATTEST:


- -----------------------------
Stanley M. Stevens, Secretary





                                       8

<PAGE>   1
 
                                                                     EXHIBIT 5.1
 
                                                               November 14, 1997
 
Board of Trustees
Equity Office Properties Trust
Two North Riverside Plaza, Suite 2200
Chicago, Illinois 60606
 
Ladies and Gentlemen:
 
     We are acting as counsel to EOP Operating Limited Partnership, a Delaware
limited partnership (the "Partnership"), in connection with its registration
statement on Form S-4, as amended (the "Registration Statement"), filed with the
Securities and Exchange Commission relating to the proposed offer for sale of up
to 9,758,175 Class A Units of Limited Partnership Interest, $.01 par value per
share, all of which units (the "Units") are to be sold by the Partnership. This
opinion letter is furnished to you at your request to enable you to fulfill the
requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R. sec. 229.601(b)(5),
in connection with the Registration Statement.
 
     For purposes of this opinion letter, we have examined copies of the
following documents:
 
          1. An executed copy of the Registration Statement.
 
          2. A certificate of the Secretary of State of the State of Delaware
     dated November 13, 1997 certifying that the Partnership is duly formed
     under the laws of the State of Delaware and is in good standing and has a
     legal existence as of such date.
 
          3. The Agreement of Limited Partnership of the Partnership and the
     Certificate of Limited Partnership of the Partnership, each as certified by
     the Secretary of Equity Office Properties Trust, as managing general
     partner of the Partnership, on the date hereof as then being complete,
     accurate and in effect.
 
          4. Agreement and Plan of Merger dated September 15, 1997 by and among
     Equity Office Properties Trust, EOP Operating Limited Partnership, Beacon
     Properties Corporation, and Beacon Properties, L.P. (the "Merger
     Agreement").
 
     In our examination of the aforesaid documents, we have assumed the
genuineness of all signatures, the legal capacity of natural persons, the
authenticity, accuracy and completeness of all documents submitted to us, and
the conformity to authentic original documents of all documents submitted to us
as to authenticate copies (including telecopies). We have also assumed the
accuracy, completeness and authenticity of the foregoing certifications of trust
officers and statements of fact, on which we are relying and have made no
independent investigations thereof. This opinion letter is given, and all
statements herein are made, in the context of the foregoing.
 
     This opinion letter is based as to matters of law solely on the Delaware
Revised Uniform Limited Partnership Act (the "Partnership Act"). We express no
opinion herein as to any other laws, statutes, regulations, or ordinances.
 
     Based upon, subject to and limited by the foregoing, we are of the opinion
that following effectiveness of the Registration Statement and issuance of the
Units in accordance with the terms of the Merger Agreement, the Units will be
validly issued, fully paid and nonassessable under the Partnership Act.
 
     We assume no obligation to advise you of any changes in the foregoing
subsequent to the delivery of this opinion letter. This opinion letter has been
prepared solely for your use in connection with the filing of the Registration
Statement on the date of this opinion letter and should not be quoted in whole
or in part or otherwise be referred to, nor filed with or furnished to any
governmental agency or other person or entity, without the prior written consent
of this firm.
<PAGE>   2
 
     We hereby consent to the filing of this opinion letter as Exhibit 5.1 to
the Registration Statement and to the reference to this firm under the caption
"Legal Matters" in the prospectus constituting a part of the Registration
Statement. In giving this consent, we do not thereby admit that we are an
"expert" within the meaning of the Securities Act of 1933, as amended.
 
                                          Very truly yours,
 
                                          HOGAN & HARTSON L.L.P.

<PAGE>   1

                                                                   Exhibit 9.1

                              VOTING AGREEMENT

                      (EQUITY OFFICE PROPERTIES TRUST)


     THIS VOTING AGREEMENT (this "Agreement") is entered into as of September
29, 1997 by and among Beacon Properties Corporation, a Maryland corporation
("BEACON"), Beacon Properties, L.P., a Delaware limited partnership (the
"BEACON PARTNERSHIP"), and each of the undersigned shareholders of Equity
Office Properties Trust, a Maryland real estate investment trust ("EOP"),
and/or limited partners in EOP Operating Limited Partnership, a Delaware
limited partnership ("EOP PARTNERSHIP") (such shareholders and/or limited
partners each individually referred to herein as a "EOP SECURITYHOLDER" and
collectively as the "EOP SECURITYHOLDERS");

     WHEREAS, EOP, EOP Partnership, Beacon and Beacon Partnership have entered
into an Agreement and Plan of Merger dated as of September 15, 1997 (the
"MERGER AGREEMENT") pursuant to which Beacon will be merged with and into EOP
(the "MERGER") and EOP shall be the survivor of the Merger and Beacon
Partnership will be merged with and into EOP Partnership pursuant to which EOP
Partnership will be the survivor of the Partnership Merger (all capitalized
terms used but not defined herein shall have the meanings set forth in the
Merger Agreement);

     WHEREAS, approximately one and 42.4/100 percent (1.424%) of the beneficial
and record ownership of the issued and outstanding common shares of beneficial
interest, $.01 par value per share, of EOP (the "EOP SHARES") are held by the
EOP Securityholders (including those EOP Shares pledged or to be pledged by EOP
Securityholders); and

     WHEREAS, approximately ninety-six and 44/100 percent (96.44%) of the
beneficial and record ownership of the issued and outstanding units of limited
partnership interest of EOP Partnership ("EOP OP UNITS") are held by the EOP
Securityholders (including those EOP OP Units pledged or to be pledged by EOP
Securityholders);

     NOW, THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

SECTION 1. DISPOSITION OF EOP SHARES AND EOP OP UNITS

     Each EOP Securityholder agrees, for the period from the date hereof
through the record date for the Meeting (as defined below) at which the Merger
is to be considered or the date on which the Merger Agreement terminates,
whichever is earlier (such period hereinafter referred to as the "TERM"),
that such EOP Securityholder will not (except with regard to those EOP Shares
or EOP OP Units described in Schedule 1 hereto which are either subject to
existing pledge or other security agreements or will be pledged pursuant to
existing understandings or arrangements ("Pledged Securities")), directly or
indirectly, (a) sell, transfer, pledge, encumber,




<PAGE>   2


assign or otherwise dispose of, or enter into any contract, option or
other agreement or understanding with respect to the sale, transfer, pledge,
encumbrance, assignment or other disposition of, any EOP Shares or EOP OP
Units, (b) grant any proxies, deposit any EOP Shares or EOP OP Units into a
voting trust or enter into a voting agreement with respect to any EOP Shares or
EOP OP Units, or tender any EOP Shares or EOP OP Units in a transaction other
than the Merger, or (c) take any action which is intended to have the effect of
preventing or disabling the EOP Securityholder from performing its obligations
under this Agreement;  provided, however, that nothing herein shall prevent the
sale, transfer or pledge of any of such EOP Shares or EOP OP Units, provided
that the purchaser, transferee or pledgee thereof agrees in writing to be bound
by the terms of this Agreement.

SECTION 2. VOTING

     (a) Each EOP Securityholder agrees, during the Term, to cast all votes
attributable to EOP Shares now and hereafter beneficially owned by such EOP
Securityholder at any annual or special meeting of shareholders of EOP,
including any adjournments or postponements thereof (a "MEETING"), (a) in favor
of adoption of the Merger Agreement and the transactions contemplated thereby
(including any amendments or modifications of the terms of the Merger Agreement
approved by the board of trustees of EOP), and (b) against approval or adoption
of any action or agreement (other than the Merger Agreement or the transactions
contemplated thereby) that would impede, interfere with, delay, postpone or
attempt to discourage the Merger.

     (b) If a vote by holders of EOP OP Units is required by applicable law or
deemed advisable by the general partner of EOP Partnership, each EOP
Securityholder agrees during the Term, to cast all votes attributable to EOP OP
Units now and hereafter beneficially owned by such EOP Securityholder at any
Meeting, (a) in favor of the Partnership Merger and the transactions
contemplated thereby (including any amendments or modifications of the terms of
the Merger Agreement approved by the board of trustees of EOP), and (b) against
approval or adoption of any action or agreement (other than the Merger
Agreement or the transactions contemplated thereby) that would impede,
interfere with, delay, postpone or attempt to discourage the Partnership
Merger.

     (c) Each EOP Securityholder agrees to cast all votes attributable to EOP
Shares held by such EOP Securityholder in favor of the election of Alan M.
Leventhal and Edwin Sidman as trustees of EOP as contemplated by, and in
accordance with, Section 1.7 of the Merger Agreement.

     (d) Notwithstanding the foregoing provisions of this Section 2, with
respect to Pledged Securities as to which a pledgee's consent is required in
connection with any vote required by such foregoing provisions, as indicated in
Schedule 1 hereto, the EOP Securityholder of such Pledged Securities shall use
his or its reasonable best efforts to obtain such consent but shall be under no
obligation to vote such Pledged Securities unless and until such consent is
obtained.


                                    - 2 -



<PAGE>   3





SECTION 3.  REPRESENTATIONS AND WARRANTIES OF THE EOP SECURITYHOLDERS

     Each of the EOP Securityholders represents and warrants to Beacon as 
follows:

     (a) The execution and delivery of this Agreement and the consummation of
the transactions herein contemplated will not conflict with or violate any law,
regulation, court order, judgment or decree applicable to such EOP
Securityholder, or conflict with or result in any breach of or constitute a
default (or an event which with notice or lapse of time or both would become a
default) under any contract or agreement to which such EOP Securityholder is a
party or by which such EOP Securityholder is bound or affected, which conflict,
violation, breach or default would materially and adversely affect such EOP
Securityholder's ability to perform this Agreement.

     (b) Such EOP Securityholder is not required to give any notice or make any
report or other filing with any governmental authority in connection with the
execution or delivery of this Agreement or the performance of such EOP
Securityholder's obligations hereunder and no waiver, consent, approval or
authorization of any governmental or regulatory authority or any other person
or entity is required to be obtained by such EOP Securityholder for the
performance of such EOP Securityholder's obligations hereunder, other than
where the failure to make such filings, give such notices or obtain such
waivers, consents, approvals or authorizations would not materially and
adversely affect such EOP Securityholder's ability to perform this Agreement.

     (c) EOP Shares and EOP OP Units set forth opposite the name of such EOP
Securityholder on Schedule 1 hereto are the only EOP Shares and EOP OP Units
owned beneficially or of record by such EOP Securityholder or over which such
person exercises voting control.

SECTION 4. UNDERSTANDING OF THIS AGREEMENT

     Each EOP Securityholder has carefully read this Agreement and has
discussed its requirements, to the extent such EOP Securityholder believes
necessary, with its counsel (which may be counsel to EOP).  The undersigned
further understands that the parties to the Merger Agreement will be proceeding
in reliance upon this Agreement.

SECTION 5. DESCRIPTIVE HEADINGS

     The descriptive headings herein are inserted for convenience only and are
not intended to be part of or to affect the meaning or interpretation of this
Agreement.

SECTION 6. COUNTERPARTS

     This Agreement may be executed in counterparts, each of which when so
executed and delivered shall be an original, but all of such counterparts shall
together constitute one and the same instrument.


                                    - 3 -
                            

 
<PAGE>   4




SECTION 7. ENTIRE AGREEMENT; ASSIGNMENT

     This Agreement (i) constitutes the entire agreement and supersedes all
prior agreements and understandings, both written and oral, among the parties
hereto with respect to the subject matter hereof and (ii) shall not be assigned
by operation of law or otherwise.

SECTION 8. GOVERNING LAW

     THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF MARYLAND WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF
LAWS THEREOF.

SECTION 9. SPECIFIC PERFORMANCE

     The parties hereto agree that if any of the provisions of this Agreement
were not performed in accordance with their specific terms or were otherwise
breached, irreparable damage would occur, no adequate remedy at law would exist
and damages would be difficult to determine, and that the parties shall be
entitled to specific performance of the terms hereof, in addition to any other
remedy at law or equity.

SECTION 10. PARTIES IN INTEREST

     This Agreement shall be binding upon and inure solely to the benefit of
each party hereto, and nothing in this Agreement, express or implied, is
intended to or shall confer upon any other person or persons any rights,
benefits or remedies of any nature whatsoever under or by reason of this
Agreement.

SECTION 11. AMENDMENT; WAIVERS

     This Agreement shall not be amended, altered or modified except by an
instrument in writing duly executed by each of the parties hereto.  No delay or
failure on the part of any party hereto in exercising any right, power or
privilege under this Agreement shall impair any such right, power or privilege
or be construed as a waiver of any default or any acquiescence thereto.  No
single or partial exercise of any such right, power or privilege shall preclude
the further exercise of such right, power or privilege, or the exercise of any
other right, power or privilege.  No waiver shall be valid against any party
hereto, unless made in writing and signed by the party against whom enforcement
of such waiver is sought, and then only to the extent expressly specified
therein.

SECTION 12. CONFLICT OF TERMS

     In the event any provision of this Agreement is directly in conflict with,
or inconsistent with, any provision of the Merger Agreement, the provision of
the Merger Agreement shall control.



                                    - 4 -
 


<PAGE>   5






                [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]




                                    - 5 -
 


<PAGE>   6



     IN WITNESS WHEREOF, the parties hereto have duly executed and delivered
this Voting Agreement, or have caused this Voting Agreement to be duly executed
and delivered in their names and on their behalf, as of the date first written
above.

                                    EQUITY OFFICE PROPERTIES TRUST

                                    By: /s/ Stanley M. Stevens
                                       -----------------------------------
                                         Name: Stanley M. Stevens
                                         Title: EVP-Chief Legal Counsel


                                    EOP OPERATING LIMITED

                                    By: Equity Office Properties Trust, its
                                        general partner

                                           By: /s/ Stanley M. Stevens
                                              ----------------------------
                                               Name: Stanley M. Stevens
                                               Title: EVP-Chief Legal Counsel


                                    BEACON PROPERTIES CORPORATION


                                    By: /s/ William A. Bonn
                                       -----------------------------------
                                         Name: William A. Bonn
                                         Title: General Counsel

                                    BEACON PROPERTIES, L.P.

                                    By: Beacon Properties Corporation, its
                                    general partner

                                           By: /s/ William A. Bonn
                                              ----------------------------
                                                Name: William A. Bonn
                                                Title: General Counsel






                                    - 6 -
 


<PAGE>   7


                                    SECURITYHOLDERS:



                                    EGI HOLDINGS, INC.


                                    By: /s/ Sheli Z. Rosenberg
                                       ----------------------------------
                                        Name: Sheli Z. Rosenberg
                                        Title: Vice President 



                                    SAMSTOCK/SZRT, L.L.C.


                                    By: /s/ Sheli Z. Rosenberg
                                       ----------------------------------
                                        Name: Sheli Z. Rosenberg
                                        Title: Vice President 



                                    SAMSTOCK/ZFT, L.L.C.


                                    By: /s/ Sheli Z. Rosenberg
                                       ----------------------------------
                                        Name: Sheli Z. Rosenberg
                                        Title: Vice President 



                                    SAMSTOCK/ALPHA, L.L.C.


                                    By: /s/ Sheli Z. Rosenberg
                                       ----------------------------------
                                        Name: Sheli Z. Rosenberg
                                        Title: Vice President 





                                    - 7 -
 


<PAGE>   8


                                    ZELL MERRILL LYNCH REAL ESTATE OPPORTUNITY
                                    PARTNERS LIMITED PARTNERSHIP

                                    By: Equity Office Properties Trust, its
                                    managing general partner


                                         By: /s/ Michael A. Steele
                                            -----------------------------
                                         Name: Michael A. Steele
                                         Title: Executive Vice President



                                    ZELL MERRILL LYNCH REAL ESTATE OPPORTUNITY
                                    PARTNERS LIMITED PARTNERSHIP II

                                    By: Equity Office Properties Trust, its
                                    managing general partner


                                         By: /s/ Michael A. Steele
                                            -----------------------------
                                         Name: Michael A. Steele
                                         Title: Executive Vice President




                                    ZELL MERRILL LYNCH REAL ESTATE OPPORTUNITY
                                    PARTNERS LIMITED PARTNERSHIP III

                                    By: Equity Office Properties Trust, its
                                    managing general partner


                                         By: /s/ Michael A. Steele
                                            -----------------------------
                                         Name: Michael A. Steele
                                         Title: Executive Vice President





                                    - 8 -
 


<PAGE>   9



                                    ZELL MERRILL LYNCH REAL ESTATE OPPORTUNITY
                                    PARTNERS LIMITED PARTNERSHIP IV

                                    By: Equity Office Properties Trust, its
                                    managing general partner

                                         By: /s/ Michael A. Steele
                                            -----------------------------
                                         Name: Michael A. Steele
                                         Title: Executive Vice President



                                    - 9 -




<PAGE>   10


                                                                     Schedule 1



<TABLE>
<CAPTION>                          # OF OP UNITS                  TERMS OF
                                   -------------                  --------
SECURITYHOLDER      # OF SHARES                      PLEDGEE       PLEDGE
- --------------      -----------                      -------       ------
<S>                 <C>            <C>               <C>           <C>

</TABLE>



                                   - 10 -
 

<PAGE>   1
                                                                  
                                                                   Exhibit 9.2

                              VOTING AGREEMENT

                       (BEACON PROPERTIES CORPORATION)


     THIS VOTING AGREEMENT (this "Agreement") is entered into as of September
15, 1997 by and among Equity Office Properties Trust, a Maryland real estate
investment trust ("EOP"), EOP Operating Limited Partnership, a Delaware limited
partnership ("EOP PARTNERSHIP"), and each of the undersigned shareholders of
Beacon Properties Corporation, a Maryland corporation ("BEACON"), and/or
limited partners in Beacon Properties, L.P., a Delaware limited partnership
(the "BEACON PARTNERSHIP") (such shareholders and/or limited partners each
individually referred to herein as a "BEACON SECURITYHOLDER" and collectively
as the "BEACON SECURITYHOLDERS");

     WHEREAS, EOP, EOP Partnership, Beacon and Beacon Partnership have entered
into an Agreement and Plan of Merger dated as of September 15, 1997 (the
"MERGER AGREEMENT") pursuant to which Beacon will be merged with and into EOP
(the "MERGER") and EOP shall be the survivor of the Merger and Beacon
Partnership will be merged with and into EOP Partnership pursuant to which EOP
Partnership will be the survivor of the Partnership Merger (all capitalized
terms used but not defined herein shall have the meanings set forth in the
Merger Agreement);

     WHEREAS, approximately one and three-tenths percent (1.3 %) of the
beneficial and record ownership of the issued and outstanding shares of common
stock, $.01 par value per share, of Beacon (the "BEACON SHARES") are held by
the Beacon Securityholders; and

     WHEREAS, approximately three and six-tenths percent (3.6 %) of the
beneficial and record ownership of the issued and outstanding units of limited
partnership interest in Beacon Partnership ("BEACON OP UNITS") are held by the
Beacon Securityholders;

     NOW, THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

SECTION 1. DISPOSITION OF BEACON SHARES AND BEACON OP UNITS

     Each Securityholder agrees, for the period from the date hereof through
the record date for the Meeting (as defined below) at which the Merger is to be
considered or the date on which the Merger Agreement terminates, whichever is
earlier (such period hereinafter referred to as the "TERM"), that such
Securityholder will not (except with regard to those Beacon Shares as Beacon OP
Units described in Schedule 1 hereto which are subject to existing pledge or
other security agreements), directly or indirectly, (a) sell, transfer, pledge,
encumber, assign or otherwise dispose of , or enter into any contract, option
or other agreement or understanding with respect to the sale, transfer, pledge,
encumbrance, assignment or other disposition of, any Beacon Shares or Beacon OP
Units, (b) grant any proxies, deposit any Beacon Shares or Beacon OP 




<PAGE>   2

Units into a voting trust or enter into a voting agreement with respect to
any Beacon Shares or Beacon OP Units, or tender any Beacon Shares or Beacon OP
Units in a transaction other than the Merger, or (c) take any action which is
intended to have the effect of preventing or disabling the Beacon
Securityholder from performing its obligations under this Agreement; provided,
however, that nothing herein shall prevent the sale, transfer or pledge of any
of such EOP Shares, provided that the purchaser, transferee or pledgee thereof
agrees in writing to be bound by the terms of this Agreement.

SECTION 2. VOTING

     (a) Each Beacon Securityholder agrees, during the Term, to cast all votes
attributable to Beacon Shares now and hereafter beneficially owned by such
Beacon Securityholder at any annual or special meeting of shareholders of
Beacon, including any adjournments or postponements thereof (a "MEETING"), (a)
in favor of adoption of the Merger Agreement and the transactions contemplated
thereby (including any amendments or modifications of the terms of the Merger
Agreement approved by the board of directors of Beacon), and (b) against
approval or adoption of any action or agreement (other than the Merger
Agreement or the transactions contemplated thereby) that would impede,
interfere with, delay, postpone or attempt to discourage the Merger.

     (b) Each Beacon Securityholder agrees, during the Term, to cast all votes
attributable to Beacon OP Units now and hereafter beneficially owned by such
Beacon Securityholder at any meeting of Beacon Securityholders at which, and in
connection with any written consent with respect to which, such Beacon
Securityholder is entitled to vote, (a) in favor of the Partnership Merger and
the transactions contemplated thereby (including any amendments or
modifications of the terms of the Merger Agreement approved by the board of
directors of Beacon), and (b) against approval or adoption of any action or
agreement (other than the Merger Agreement or the transactions contemplated
thereby) that would impede, interfere with, delay, postpone or attempt to
discourage the Partnership Merger.

SECTION 3. REPRESENTATIONS AND WARRANTIES OF THE BEACON SECURITYHOLDERS

     Each of the Beacon Securityholders represents and warrants to EOP as 
follows:

     (a) The execution and delivery of this Agreement and the consummation of
the transactions herein contemplated will not conflict with or violate any
court order, judgment or decree applicable to such Beacon Securityholder, or
conflict with or result in any breach of or constitute a default (or an event
which with notice or lapse of time or both would become a default) under any
contract or agreement to which such Beacon Securityholder is a party or by
which such Beacon Securityholder is bound or affected, which conflict,
violation, breach or default would materially and adversely affect such Beacon
Securityholder's ability to perform this Agreement.

     (b) Such Beacon Securityholder is not required to give any notice or make
any report or other filing with any governmental authority in connection with
the execution or



                                    - 2 -

<PAGE>   3


delivery of this Agreement or the performance of such Beacon    
Securityholder's obligations hereunder and no waiver, consent, approval or
authorization of any governmental or regulatory authority or any other person
or entity is required to be obtained by such Beacon Securityholder for the
performance of such Beacon Securityholder's obligations hereunder, other than
where the failure to make such filings, give such notices or obtain such
waivers, consents, approvals or authorizations would not materially and
adversely affect such Beacon Securityholder's ability to perform this
Agreement.

     (c) Beacon Shares and Beacon OP Units set forth opposite the name of such
Beacon Securityholder on Schedule 1 hereto are the only Beacon Shares and
Beacon OP Units owned beneficially or of record by such Beacon Securityholder
or over which such person exercises voting control.

SECTION 4. UNDERSTANDING OF THIS AGREEMENT

     Each Beacon Securityholder has carefully read this Agreement and has
discussed its requirements, to the extent such Beacon Securityholder believes
necessary, with its counsel (which may be counsel to Beacon).  The undersigned
further understands that the parties to the Merger Agreement will be proceeding
in reliance upon this Agreement.

SECTION 5. DESCRIPTIVE HEADINGS

     The descriptive headings herein are inserted for convenience only and are
not intended to be part of or to affect the meaning or interpretation of this
Agreement.

SECTION 6. COUNTERPARTS

     This Agreement may be executed in counterparts, each of which when so
executed and delivered shall be an original, but all of such counterparts shall
together constitute one and the same instrument.

SECTION 7. ENTIRE AGREEMENT; ASSIGNMENT

     This Agreement (i) constitutes the entire agreement and supersedes all
prior agreements and understandings, both written and oral, among the parties
hereto with respect to the subject matter hereof and (ii) shall not be assigned
by operation of law or otherwise.

SECTION 8. GOVERNING LAW

     THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF MARYLAND WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF
LAWS THEREOF.

                                    - 3 -



<PAGE>   4




SECTION 9. SPECIFIC PERFORMANCE

     The parties hereto agree that if any of the provisions of this Agreement
were not performed in accordance with their specific terms or were otherwise
breached, irreparable damage would occur, no adequate remedy at law would exist
and damages would be difficult to determine, and that the parties shall be
entitled to specific performance of the terms hereof, in addition to any other
remedy at law or equity.

SECTION 10. PARTIES IN INTEREST

     This Agreement shall be binding upon and inure solely to the benefit of
each party hereto, and nothing in this Agreement, express or implied, is
intended to or shall confer upon any other person or persons any rights,
benefits or remedies of any nature whatsoever under or by reason of this
Agreement.

SECTION 11. AMENDMENT; WAIVERS

     This Agreement shall not be amended, altered or modified except by an
instrument in writing duly executed by each of the parties hereto.  No delay or
failure on the part of any party hereto in exercising any right, power or
privilege under this Agreement shall impair any such right, power or privilege
or be construed as a waiver of any default or any acquiescence thereto.  No
single or partial exercise of any such right, power or privilege shall preclude
the further exercise of such right, power or privilege, or the exercise of any
other right, power or privilege.  No waiver shall be valid against any party
hereto, unless made in writing and signed by the party against whom enforcement
of such waiver is sought, and then only to the extent expressly specified
therein.

SECTION 12. CONFLICT OF TERMS

     In the event any provision of this Agreement is directly in conflict with,
or inconsistent with, any provision of the Merger Agreement, the provision of
the Merger Agreement shall control.

                [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]



                                    - 4 -


<PAGE>   5




     IN WITNESS WHEREOF, the parties hereto have duly executed and delivered
this Voting Agreement, or have caused this Voting Agreement to be duly executed
and delivered in their names and on their behalf, as of the date first written
above.

                                    EQUITY OFFICE PROPERTIES TRUST

                                    By: /s/ Stanley M. Stevens
                                       ----------------------------------------
                                    Name: Stanley M. Stevens
                                    Title: EVP - Chief Legal Counsel

                                    EOP OPERATING LIMITED PARTNERSHIP

                                    By: Equity Office Properties Trust, its
                                    general partner

                                           By: /s/ Stanley M. Stevens
                                              ---------------------------------
                                           Name: Stanley M. Stevens
                                           Title: EVP - Chief Legal Counsel

                                    BEACON PROPERTIES CORPORATION


                                    By: /s/ William A. Bonn
                                       ----------------------------------------
                                    Name: William A. Bonn
                                    Title: General Counsel

                                    BEACON PROPERTIES, L.P.

                                    By: Beacon Properties Corporation, its
                                    general partner

                                           By: /s/ William A. Bonn
                                              ---------------------------------
                                           Name: William A. Bonn
                                           Title: General Counsel


                                    - 5 -



<PAGE>   6


                                 Schedule 1



<TABLE>
<CAPTION>

SECURITYHOLDER                      # UNITS                # SHARES
- --------------                      -------                --------
<S>                                 <C>                    <C>

</TABLE>
- ---------------







                                    - 6 -

<PAGE>   7

     IN WITNESS WHEREOF, the parties hereto have duly executed and delivered
this Voting Agreement, or have caused this Voting Agreement to be duly executed
and delivered in their names and on their behalf, as of the date first written
above.

                                    THE BONNYBROOK TRUST

                                    By: /s/ ALAN M. LEVENTHAL
                                        ---------------------------------------
                                        Name: Alan M. Leventhal
                                              ---------------------------------
                                                 As Trustee

                                    THE BONNYBROOK TRUST
                                      
                                    By: /s/ ALAN M. LEVENTHAL
                                        ---------------------------------------
                                        Name: Alan M. Leventhal
                                              ---------------------------------
                                                 As Trustee

                                    THE DARTMOUTH TRUST

                                    By: /s/ MARK S. LEVENTHAL
                                        ---------------------------------------
                                        Name: Mark S. Leventhal
                                              ---------------------------------
                                                 As Trustee

                                    THE DARTMOUTH TRUST

                                    By: /s/ ALAN M. LEVENTHAL
                                        ---------------------------------------
                                        Name: Alan M. Leventhal
                                              ---------------------------------
                                                 As Trustee

                                    HOMATT LIMITED PARTNERSHIP

                                    By: /s/ ALAN M. LEVENTHAL
                                        ---------------------------------------
                                        Alan M.  Leventhal
                                        General Partner

                                    By: /s/ PAULA L. SIDMAN
                                        ---------------------------------------
                                        Paula L. Sidman
                                        General Partner

                                    JERAL LIMITED PARTNERSHIP

                                    By: /s/ MARK S. LEVENTHAL
                                        ---------------------------------------
                                        Mark S.  Leventhal
                                        General Partner

                                    By: /s/ PAULA L. SIDMAN
                                        ---------------------------------------
                                        Paula L. Sidman
                                        General Partner



<PAGE>   8


                                    THE LEVENTHAL FAMILY
                                    LIMITED PARTNERSHIP

                                    By: /s/ ALAN M. LEVENTHAL
                                        ---------------------------------------
                                        Name: Alan M. Leventhal
                                              ---------------------------------
                                        Title:

                                    By: /s/ MARK S. LEVENTHAL
                                        ---------------------------------------
                                        Name: Mark S. Leventhal
                                              ---------------------------------
                                        Title:

                                    PICKWICK TRUST

                                    By: /s/ ALAN M. LEVENTHAL
                                        ---------------------------------------
                                        Name: Alan M. Leventhal
                                              ---------------------------------
                                         As Trustee

                                    By: /s/ MARK S. LEVENTHAL
                                        ---------------------------------------
                                        Name: Mark S. Leventhal
                                              ---------------------------------
                                                As Trustee

                                    TRIDON LIMITED PARTNERSHIP

                                    By: /s/ ALAN M. LEVENTHAL
                                        ---------------------------------------
                                        Alan M.  Leventhal
                                        General Partner

                                    By: /s/ PAULA L. SIDMAN
                                        ---------------------------------------
                                        Paula L. Sidman
                                        General Partner

                                    WYKEHAM TRUST

                                    By: /s/ EDWIN SIDMAN
                                        ---------------------------------------
                                        Name: Edwin Sidman
                                              ---------------------------------
                                                As Trustee

                                    By: /s/ MARK S. LEVENTHAL
                                        ---------------------------------------
                                        Name: Mark S. Leventhal
                                              ---------------------------------
                                                As Trustee

                                    /s/ ALAN LEVENTHAL
                                    -------------------------------------------
                                    Alan Leventhal


                                    /s/ MARK LEVENTHAL
                                    -------------------------------------------
                                    Mark Leventhal





<PAGE>   9



                                    /s/ NORMAN LEVENTHAL
                                    -------------------------------------------
                                    Norman Leventhal



                                    /s/ EDWIN SIDMAN
                                    -------------------------------------------
                                    Edwin Sidman



                                    /s/ PAULA SIDMAN
                                    -------------------------------------------
                                    Paula Sidman

<PAGE>   1

                                                                   Exhibit 10.7


                          STOCK PURCHASE AGREEMENT


     THIS STOCK PURCHASE AGREEMENT (the "Agreement"), dated as of September 14,
1997, is made and entered into among Equity Office Properties Management Corp.,
a Delaware corporation ("Purchaser"), and the undersigned stockholders (each, a
"Stockholder," and collectively, the "Stockholders") of Beacon Property
Management Corporation, a Delaware corporation (the "Company").

     WHEREAS, Equity Office Properties Trust, a Maryland real estate investment
trust ("Equity Office Properties"), Equity Office Properties Operating Limited
Partnership, a Delaware limited partnership ("Equity Office Properties
Partnership"), Beacon Properties Corporation, a Maryland corporation
("Beacon"), and Beacon Properties, L.P., a Delaware limited partnership
("Beacon Partnership"), have on the date hereof entered into an Agreement and
Plan of Merger (the "Merger Agreement") pursuant to which Beacon shall be
merged with and into Equity Office Properties and Beacon Partnership shall be
merged with and into Equity Office Properties Partnership (the "Mergers");

     WHEREAS, the authorized capital stock of the Company consists of (i) one
thousand (1,000) shares, $.01 par value per share (the "Voting Shares"), of
which nine hundred ninety (990) shares are issued and outstanding and owned by
the Stockholders as set forth on Exhibit A and ten (10) shares of which are
issued and outstanding and owned by Beacon Partnership, and (ii) one thousand
(1,000 ) shares of non voting stock, $.01 par value per share, of which one
thousand (1,000) shares are issued and outstanding and owned by Beacon
Partnership; and

     WHEREAS, as an inducement to Equity Office Properties and Equity Office
Properties Partnership to enter into the Merger Agreement, the Stockholders
have agreed to sell all of the outstanding Voting Shares held by them to
Purchaser.

     NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

                                  ARTICLE 1

                              SALE AND PURCHASE

     1.1 Sale of Voting Shares.  Subject to, and in consideration of, the terms
and conditions of this Agreement, at the Closing (as defined in Article 2),
each Stockholder shall sell, and Purchaser shall purchase, all right, title and
interest of such Stockholder in the Voting Shares set forth opposite such
Stockholder's




<PAGE>   2


name on Exhibit A.  At the Closing, each Stockholder shall deliver or cause to
be delivered to Purchaser, stock certificates representing the Voting Shares
set forth opposite such Stockholder's name on Exhibit A, duly endorsed in blank
or accompanied by stock powers duly executed in blank, in proper form for
transfer, with all appropriate stock transfer tax stamps affixed.

     1.2 Purchase Price; Delivery.  In consideration of the sale, assignment,
transfer, conveyance and delivery described above, at the Closing Purchaser
will pay each Stockholder in immediately available funds an amount equal to (i)
the number of Voting Shares set forth opposite such Stockholder's name on
Exhibit A hereto, multiplied by (ii) the fair market value per Voting Share as
determined by the parties hereto (or, if the parties are unable to so agree,
based upon an appraisal by an independent appraiser unaffiliated with any party
hereto in a manner consistent with industry practice).

                                  ARTICLE 2

                                   CLOSING

     2.1 Closing; Closing Date.  Subject to the satisfaction or waiver of the
conditions set forth in Article 5, the closing of the sale and purchase of the
Voting Shares (the "Closing") shall take place on the same date, and at the
same time and place, as the closing under the Merger Agreement, or at such
other time and place as shall be agreed upon by the parties.  The time and date
of the Closing shall be referred to as the "Closing Date."

                                  ARTICLE 3

                       REPRESENTATIONS AND WARRANTIES

     3.1 Representations and Warranties of Stockholders.   Each Stockholder
represents and warrants to Purchaser as to itself or himself as follows:

     (a) Title.  Such Stockholder is, and on the Closing Date will be, the
beneficial and record owner of the Voting Shares set forth opposite such
Stockholder's name on Exhibit A, free and clear of all pledges, liens,
encumbrances, restrictions, voting agreements or trusts, rights, claims or
charges of any nature or kind whatsoever (collectively, "Claims").  Upon
delivery to Purchaser of the certificate or certificates representing such
Voting Shares duly endorsed in blank for transfer or with stock powers attached
duly executed in blank, against delivery of the Purchase Price, good and valid
title to such Voting Shares shall be transferred to Purchaser free and clear of
any and all Claims.

     (b) Capacity.  Such Stockholder has full legal right, capacity, authority
and power to execute and deliver this Agreement and to consummate the
transactions contemplated hereby.

     (c) Binding Obligation.  This Agreement has been duly executed and
delivered by such Stockholder and constitutes such Stockholder's legal, valid
and binding obligation, 

                                    - 2 -



<PAGE>   3


enforceable against such Stockholder in accordance with and subject to its
terms, subject to applicable bankruptcy, insolvency, moratorium or other
similar laws relating to creditors' rights and general principles of equity.

     (d) Non-Contravention.  Neither the execution and delivery by such
Stockholder of this Agreement nor the consummation by such Stockholder of the
transactions contemplated hereby conflict with, or result in any breach of,
constitute a default under, permit the termination of, or result in the
acceleration of any indebtedness under, any agreement, contract, lease,
promissory note, indenture, covenant or other arrangement to which such
Stockholder is a party or by which such Stockholder is, or such Stockholder's
assets are, bound.

     3.2 Representations and Warranties of Purchaser.  Purchaser represents and
warrants to each Stockholder as follows:

     (a) Organization and Standing.  Purchaser (i) is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, (ii) has the full and unrestricted corporate power and corporate
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby and (iii) has the full and unrestricted
corporate power and authority to own, operate and lease its properties and to
carry on its business.

     (b) Authorization.  The execution and delivery of this Agreement by
Purchaser, and the consummation by Purchaser of the transactions contemplated
hereby, have been duly and validly authorized by all necessary corporate or
other action on the part of Purchaser.

     (c) Binding Obligation.  This Agreement has been duly executed and
delivered by Purchaser and constitutes Purchaser's legal, valid and binding
obligation, enforceable against Purchaser in accordance with and subject to its
terms, subject to applicable bankruptcy, insolvency, moratorium or other
similar laws relating to creditors' rights and general principles of equity.

     (d) Non-Contravention.  Neither the execution and delivery by Purchaser of
this Agreement nor the consummation by Purchaser of the transactions
contemplated hereby conflict with, or result in any breach of, constitute a
default under, permit the termination of, or result in the acceleration of any
indebtedness under, any agreement, contract, lease, promissory note, indenture,
covenant or other arrangement to which Purchaser is a party or by which it is,
or its assets are, bound.

     (e) Purchase of Voting Shares.  Purchaser is purchasing the Voting Shares
for its own account and not with a view toward, or for resale in connection
with, any distribution thereof.

                                    - 3 -



<PAGE>   4



                                  ARTICLE 4

                                  COVENANTS

     4.1 Filings under HSR Act.  Purchaser and each Stockholder shall use all
reasonable best efforts to cooperate with one another in determining, no later
than ten (10) days from the date hereof whether any filings are required under
the HSR Act in connection with this Agreement, and as soon as practicable upon
making any determination that such filings are required, and in any event
within fifteen (15) days after making such determination, shall make all
necessary filings under the HSR Act and shall cooperate in attempts to secure
early termination of the applicable waiting period.

     4.2 Conduct of Company Business.  From and after the date hereof, no
Stockholder shall take any action, the result of which would be to cause the
Company to conduct its business other than in the ordinary course consistent
with past practice (including, without limitation, the declaration, setting
aside or payment of any dividend or distribution with respect to the Company's
capital stock).  Without limiting the generality of the foregoing, no
Stockholder shall approve (i) the issuance by the Company of any capital stock
or any options, warrants or other rights to subscribe for or purchase any of
the Company's capital stock or any securities convertible into or exchangeable
for the Company's capital stock, (ii) the direct or indirect redemption,
purchase or other acquisition of any of the Company's capital stock, (iii) a
split, reclassification or other change in or of any of the Company's capital
stock, or (iv) any amendment of the Company's articles of incorporation or
bylaws.

     4.3 Additional Actions and Documents.  Each of the parties hereby agrees
to take or cause to be taken such further actions and to execute, deliver and
file or cause to be executed, delivered and filed, such further documents as
may be necessary or as may be reasonably requested in order to fully effectuate
the purposes, terms and conditions of this Agreement.

                                  ARTICLE 5

                            CONDITIONS TO CLOSING

     5.1 Conditions to the Obligations of Purchaser.  The obligations of
Purchaser under this Agreement are subject to the fulfillment, at or prior to
the Closing, of each of the following conditions:

     (a) The representations and warranties made by each of the Stockholders in
this Agreement shall be true and correct when made, and on and as of the
Closing Date as though such representations and warranties were made on and as
of the Closing Date.

     (b) Each Stockholder shall have performed and complied with all covenants
and conditions required by this Agreement to be performed or complied with by
it or him or all one or more Stockholders collectively prior to the Closing
Date.

                                    - 4 -


<PAGE>   5



     (c) No action or proceeding by or before any governmental authority shall
have been instituted or threatened (and not subsequently settled, dismissed or
otherwise terminated) which is reasonably expected to restrain, prohibit or
invalidate the transactions contemplated by this Agreement other than an action
or proceeding instituted or threatened by Purchaser.

     (d) Each Stockholder shall have delivered to Purchaser a certificate,
dated as of the Closing Date and executed by such Stockholder, certifying, as
to such Stockholder, the fulfillment of the conditions specified in Sections
5.1(a) and (b).

     (e) Any and all applicable waiting periods under the HSR Act shall have
expired.

     (f) Each of the parties to the Merger Agreement shall have certified to
Purchaser that all conditions to the closing of the transactions thereunder
have been waived or satisfied.

     5.2 Conditions to the Obligations of each Stockholder.  The obligations of
each Stockholder under this Agreement are subject to the fulfillment, at or
prior to the Closing, of each of the following conditions:

     (a) The representations and warranties made by Purchaser in this Agreement
shall be true and correct when made, and on and as of the Closing Date as
though such representations and warranties were made on and as of the Closing
Date.

     (b) Purchaser shall have performed and complied with all covenants and
conditions required by this Agreement to be performed or complied with by it
prior to the Closing Date.

     (c) No action or proceeding by or before any governmental authority shall
have been instituted or threatened (and not subsequently settled, dismissed or
otherwise terminated) which is reasonably expected to restrain, prohibit or
invalidate the transactions contemplated by this Agreement other than an action
or proceeding instituted or threatened by one or more of the Company or one or 
more Stockholders.

     (d) Purchaser shall have delivered to the Stockholders a certificate,
dated as of the Closing Date and executed by Purchaser, certifying, as to such
Stockholder, the fulfillment of the conditions specified in Sections 5.2 (a)
and (b).

     (e) Any and all applicable waiting periods under the HSR Act shall have
expired.

     (f) Each of the parties to the Merger Agreement shall have certified to
the Stockholders that all conditions to the closing of the transactions
thereunder have been waived or satisfied.

                                    - 5 -


<PAGE>   6



                                  ARTICLE 6

                                 TERMINATION

     6.1   Events of Termination.  (a) This Agreement may be terminated at any
time before the Closing Date under any one or more of the following
circumstances:

     (i)   by the mutual written consent of all of the parties hereto;

     (ii)  by Purchaser, if any Stockholder shall have breached, or failed to
comply with, in any material respect any of its or his respective obligations
under this Agreement or any representation or warranty made by it or him shall
have been incorrect when made or shall have since ceased to be true and
correct;

     (iii) by the Stockholders, if Purchaser shall have breached, or failed to
comply with, in any material respect any of its obligations under this
Agreement or any representation or warranty made by Purchaser shall have been
incorrect when made or shall have since ceased to be true and correct; or

     (iv)  by Purchaser or the Stockholders, if any decree, permanent
injunction, judgment, order or other action by any court of competent
jurisdiction or any governmental or regulatory authority preventing or
prohibiting consummation of the transactions contemplated hereby shall have
become final and non-appealable.

     (b)   This Agreement shall terminate immediately upon the termination of 
the Merger Agreement.

     6.2   Effect of Termination.  In the event this Agreement is terminated as
provided in this Article 6, this Agreement shall forthwith become wholly
void and of no effect, and the parties shall be released from all future
obligations hereunder, except that the provisions of Section 7.4 (Governing
Law) shall survive the termination of this Agreement; provided, however, that
nothing herein shall relieve any party for any material breach of any of its or
his representations, warranties, covenants or agreements under this Agreement.

                                  ARTICLE 7

                                MISCELLANEOUS

     7.1   Descriptive Headings.  The descriptive headings herein are inserted
for convenience only and are not intended to be part of or to affect the
meaning or interpretation of this Agreement.

     7.2   Counterparts.  This Agreement may be executed in counterparts, each 
of which when so executed and delivered shall be an original, but all of such
counterparts shall together constitute one and the same instrument.


                                    - 6 -



<PAGE>   7



     7.3 Entire Agreement; Assignment.  This Agreement (i) constitutes the
entire agreement and supersedes all prior agreements and understandings, both
written and oral, among the parties hereto with respect to the subject matter
hereof and (ii) shall not be assigned by any party hereto by operation of law
or otherwise, without the prior written consent of each other party hereto;
provided, however, that Purchaser may assign this Agreement without consent of
the Stockholders to any affiliate of Purchaser.

     7.4 Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF MARYLAND WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAWS THEREOF.

     7.5 Specific Performance.  The parties hereto agree that if any of the
provisions of this Agreement were not performed in accordance with their
specific terms or were otherwise breached, irreparable damage would occur, no
adequate remedy at law would exist and damages would be difficult to determine,
and that the parties shall be entitled to specific performance of the terms
hereof, in addition to any other remedy at law or equity.

     7.6 Parties in Interest.  This Agreement shall be binding upon and inure
solely to the benefit of each party hereto, and nothing in this Agreement,
express or implied, is intended to or shall confer upon any other person or
persons any rights, benefits or remedies of any nature whatsoever under or by
reason of this Agreement.

     7.7 Amendment; Waivers.  This Agreement shall not be amended, altered or
modified except by an instrument in writing duly executed by each of the
parties hereto.  No delay or failure on the part of any party hereto in
exercising any right, power or privilege under this Agreement shall impair any
such right, power or privilege or be construed as a waiver of any default or
any acquiescence thereto.  No single or partial exercise of any such right,
power or privilege shall preclude the further exercise of such right, power or
privilege, or the exercise of any other right, power or privilege.  No waiver
shall be valid against any party hereto, unless made in writing and signed by
the party against whom enforcement of such waiver is sought, and then only to
the extent expressly specified therein.


                                    - 7 -


<PAGE>   8




     IN WITNESS WHEREOF, the parties have executed this Agreement on the date
first above written.

                                           EQUITY OFFICE PROPERTIES MANAGEMENT
                                           CORP.


                                           By: /s/ Stanley M. Stevens
                                              --------------------------------
                                           Name: Stanley M. Stevens
                                           Title: V.P.

Stockholders:


/s/ Norman B. Leventhal, Trustee
- --------------------------------
Name: Norman B. Leventhal, as
      Voting Trustee u/t/a dated
      March 6, 1989




                                    - 8 -



<PAGE>   9





                                                                      Exhibit A


<TABLE>
<CAPTION>


Name of Stockholder      Number of Voting Shares
- --------------------     -----------------------
<S>                      <C>
Norman B. Leventhal,                    990
as Voting Trustee u/t/a
dated March 6, 1989
</TABLE>






<PAGE>   1

                                                                 Exhibit 10.8


                          STOCK PURCHASE AGREEMENT


     THIS STOCK PURCHASE AGREEMENT (the "Agreement"), dated as of September 14,
1997, is made and entered into among Equity Office Properties Management Corp.,
a Delaware corporation ("Purchaser"), and the undersigned stockholders (each, a
"Stockholder," and collectively, the "Stockholders") of Beacon Design
Corporation, a Massachusetts corporation (the "Company").

     WHEREAS, Equity Office Properties Trust, a Maryland real estate investment
trust ("Equity Office Properties"), Equity Office Properties Operating Limited
Partnership, a Delaware limited partnership ("Equity Office Properties
Partnership"), Beacon Properties Corporation, a Maryland corporation
("Beacon"), and Beacon Properties, L.P., a Delaware limited partnership
("Beacon Partnership"), have on the date hereof entered into an Agreement and
Plan of Merger (the "Merger Agreement") pursuant to which Beacon shall be
merged with and into Equity Office Properties and Beacon Partnership shall be
merged with and into Equity Office Properties Partnership (the "Mergers");

     WHEREAS, the authorized capital stock of the Company consists of (i) one
thousand (1,000) shares, $.01 par value per share (the "Voting Shares"), of
which nine hundred ninety (990) shares are issued and outstanding and owned by
the Stockholders as set forth on Exhibit A and ten (10) shares of which are
issued and outstanding and owned by Beacon Partnership, and (ii) one thousand
(1,000) shares, $.01 par value per share, of which (1,000) shares are issued
and outstanding and owned by Beacon Partnership; and

     WHEREAS, as an inducement to Equity Office Properties and Equity Office
Properties Partnership to enter into the Merger Agreement, the Stockholders
have agreed to sell all of the outstanding Voting Shares held by them to
Purchaser.

     NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

                                  ARTICLE 1

                              SALE AND PURCHASE

     1.1 Sale of Voting Shares.  Subject to, and in consideration of, the terms
and conditions of this Agreement, at the Closing (as defined in Article 2),
each Stockholder shall sell, and Purchaser shall purchase, all right, title and
interest of such Stockholder in the Voting Shares set forth opposite such
Stockholder's name on Exhibit A.  At the Closing, each Stockholder shall
deliver or cause to be  delivered to Purchaser, stock certificates representing
the Voting Shares set forth opposite such Stockholder's name on Exhibit A, duly
endorsed in blank or accompanied by 



<PAGE>   2




stock powers duly executed in blank, in proper form for transfer, with all
appropriate stock transfer tax stamps affixed.

     1.2 Purchase Price; Delivery.  In consideration of the sale, assignment,
transfer, conveyance and delivery described above, at the Closing Purchaser
will pay each Stockholder in immediately available funds an amount equal to (i)
the number of Voting Shares set forth opposite such Stockholder's name on
Exhibit A hereto, multiplied by (ii) the fair market value per Voting Share as
determined by the parties hereto (or, if the parties are unable to so agree,
based upon an appraisal by an independent appraiser unaffiliated with any party
hereto in a manner consistent with industry practice).

                                  ARTICLE 2

                                   CLOSING

     2.1 Closing; Closing Date.  Subject to the satisfaction or waiver of the
conditions set forth in Article 5, the closing of the sale and purchase of the
Voting Shares (the "Closing") shall take place on the same date, and at the
same time and place, as the closing under the Merger Agreement, or at such
other time and place as shall be agreed upon by the parties.  The time and date
of the Closing shall be referred to as the "Closing Date."

                                  ARTICLE 3

                       REPRESENTATIONS AND WARRANTIES

     3.1 Representations and Warranties of Stockholders.   Each Stockholder
represents and warrants to Purchaser as to itself or himself as follows:

     (a) Title.  Such Stockholder is, and on the Closing Date will be, the
beneficial and record owner of the Voting Shares set forth opposite such
Stockholder's name on Exhibit A, free and clear of all pledges, liens,
encumbrances, restrictions, voting agreements or trusts, rights, claims or
charges of any nature or kind whatsoever (collectively, "Claims").  Upon
delivery to Purchaser of the certificate or certificates representing such
Voting Shares duly endorsed in blank for transfer or with stock powers attached
duly executed in blank, against delivery of the Purchase Price, good and valid
title to such Voting Shares shall be transferred to Purchaser free and clear of
any and all Claims.

     (b) Capacity.  Such Stockholder has full legal right, capacity, authority
and power to execute and deliver this Agreement and to consummate the
transactions contemplated hereby.

     (c) Binding Obligation.  This Agreement has been duly executed and
delivered by such Stockholder and constitutes such Stockholder's legal, valid
and binding obligation, enforceable against such Stockholder in accordance with
and subject to its terms, subject to ap-


                                    - 2 -


<PAGE>   3




plicable bankruptcy, insolvency, moratorium or other similar laws       
relating to creditors' rights and general principles of equity.

     (d) Non-Contravention.  Neither the execution and delivery by such
Stockholder of this Agreement nor the consummation by such Stockholder of the
transactions contemplated hereby conflict with, or result in any breach of,
constitute a default under, permit the termination of, or result in the
acceleration of any indebtedness under, any agreement, contract, lease,
promissory note, indenture, covenant or other arrangement to which such
Stockholder is a party or by which such Stockholder is, or such Stockholder's
assets are, bound.

     3.2 Representations and Warranties of Purchaser.  Purchaser represents and
warrants to each Stockholder as follows:

     (a) Organization and Standing.  Purchaser (i) is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, (ii) has the full and unrestricted corporate power and corporate
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby and (iii) has the full and unrestricted
corporate power and authority to own, operate and lease its properties and to
carry on its business.

     (b) Authorization.  The execution and delivery of this Agreement by
Purchaser, and the consummation by Purchaser of the transactions contemplated
hereby, have been duly and validly authorized by all necessary corporate or
other action on the part of Purchaser.

     (c) Binding Obligation.  This Agreement has been duly executed and
delivered by Purchaser and constitutes Purchaser's legal, valid and binding
obligation, enforceable against Purchaser in accordance with and subject to its
terms, subject to applicable bankruptcy, insolvency, moratorium or other
similar laws relating to creditors' rights and general principles of equity.

     (d) Non-Contravention.  Neither the execution and delivery by Purchaser of
this Agreement nor the consummation by Purchaser of the transactions
contemplated hereby conflict with, or result in any breach of, constitute a
default under, permit the termination of, or result in the acceleration of any
indebtedness under, any agreement, contract, lease, promissory note, indenture,
covenant or other arrangement to which Purchaser is a party or by which it is,
or its assets are, bound.

     (e) Purchase of Voting Shares.  Purchaser is purchasing the Voting Shares
for its own account and not with a view toward, or for resale in connection
with, any distribution thereof.

                                    - 3 -


<PAGE>   4





                                  ARTICLE 4

                                  COVENANTS

     4.1 Filings under HSR Act.  Purchaser and each Stockholder shall use all
reasonable best efforts to cooperate with one another in determining, no later
than ten (10) days from the date hereof whether any filings are required under
the HSR Act in connection with this Agreement, and as soon as practicable upon
making any determination that such filings are required, and in any event
within fifteen (15) days after making such determination, shall make all
necessary filings under the HSR Act and shall cooperate in attempts to secure
early termination of the applicable waiting period.

     4.2 Conduct of Company Business.  From and after the date hereof, no
Stockholder shall take any action, the result of which would be to cause the
Company to conduct its business other than in the ordinary course consistent
with past practice (including, without limitation, the declaration, setting
aside or payment of any dividend or distribution with respect to the Company's
capital stock).  Without limiting the generality of the foregoing, no
Stockholder shall approve (i) the issuance by the Company of any capital stock
or any options, warrants or other rights to subscribe for or purchase any of
the Company's capital stock or any securities convertible into or exchangeable
for the Company's capital stock, (ii) the direct or indirect redemption,
purchase or other acquisition of any of the Company's capital stock, (iii) a
split, reclassification or other change in or of any of the Company's capital
stock, or (iv) any amendment of the Company's articles of incorporation or
bylaws.

     4.3 Additional Actions and Documents.  Each of the parties hereby agrees
to take or cause to be taken such further actions and to execute, deliver and
file or cause to be executed, delivered and filed, such further documents as
may be necessary or as may be reasonably requested in order to fully effectuate
the purposes, terms and conditions of this Agreement.

                                  ARTICLE 5

                            CONDITIONS TO CLOSING

     5.1 Conditions to the Obligations of Purchaser.  The obligations of
Purchaser under this Agreement are subject to the fulfillment, at or prior to
the Closing, of each of the following conditions:

     (a) The representations and warranties made by each of the Stockholders in
this Agreement shall be true and correct when made, and on and as of the
Closing Date as though such representations and warranties were made on and as
of the Closing Date.

     (b) Each Stockholder shall have performed and complied with all covenants
and conditions required by this Agreement to be performed or complied with by
it or him or all one or more Stockholders collectively prior to the Closing
Date.

                                    - 4 -

<PAGE>   5




     (c) No action or proceeding by or before any governmental authority shall
have been instituted or threatened (and not subsequently settled, dismissed or
otherwise terminated) which is reasonably expected to restrain, prohibit or
invalidate the transactions contemplated by this Agreement other than an action
or proceeding instituted or threatened by Purchaser.

     (d) Each Stockholder shall have delivered to Purchaser a certificate,
dated as of the Closing Date and executed by such Stockholder, certifying, as
to such Stockholder, the fulfillment of the conditions specified in Sections
5.1(a) and (b).

     (e) Any and all applicable waiting periods under the HSR Act shall have
expired.

     (f) Each of the parties to the Merger Agreement shall have certified to
Purchaser that all conditions to the closing of the transactions thereunder
have been waived or satisfied.

     5.2 Conditions to the Obligations of each Stockholder.  The obligations of
each Stockholder under this Agreement are subject to the fulfillment, at or
prior to the Closing, of each of the following conditions:

     (a) The representations and warranties made by Purchaser in this Agreement
shall be true and correct when made, and on and as of the Closing Date as
though such representations and warranties were made on and as of the Closing
Date.

     (b) Purchaser shall have performed and complied with all covenants and
conditions required by this Agreement to be performed or complied with by it
prior to the Closing Date.

     (c) No action or proceeding by or before any governmental authority shall
have been instituted or threatened (and not subsequently settled, dismissed or
otherwise terminated) which is reasonably expected to restrain, prohibit or
invalidate the transactions contemplated by this Agreement other than an action
or proceeding instituted or threatened by one or more of the Company or one or 
more Stockholders.

     (d) Purchaser shall have delivered to the Stockholders a certificate,
dated as of the Closing Date and executed by Purchaser, certifying, as to such
Stockholder, the fulfillment of the conditions specified in Sections 5.2 (a)
and (b).

     (e) Any and all applicable waiting periods under the HSR Act shall have
expired.

     (f) Each of the parties to the Merger Agreement shall have certified to
the Stockholders that all conditions to the closing of the transactions
thereunder have been waived or satisfied.


                                    - 5 -


<PAGE>   6





                                  ARTICLE 6

                                 TERMINATION

     6.1   Events of Termination.  (a) This Agreement may be terminated at any
time before the Closing Date under any one or more of the following
circumstances:

     (i)   by the mutual written consent of all of the parties hereto;

     (ii)  by Purchaser, if any Stockholder shall have breached, or failed to
comply with, in any material respect any of its or his respective obligations
under this Agreement or any representation or warranty made by it or him shall
have been incorrect when made or shall have since ceased to be true and
correct;

     (iii) by the Stockholders, if Purchaser shall have breached, or failed to
comply with, in any material respect any of its obligations under this
Agreement or any representation or warranty made by Purchaser shall have been
incorrect when made or shall have since ceased to be true and correct; or

     (iv)  by Purchaser or the Stockholders, if any decree, permanent
injunction, judgment, order or other action by any court of competent
jurisdiction or any governmental or regulatory authority preventing or
prohibiting consummation of the transactions contemplated hereby shall have
become final and non-appealable.

     (b)   This Agreement shall terminate immediately upon the termination of 
the Merger Agreement.

     6.2   Effect of Termination.  In the event this Agreement is terminated 
as provided in this Article 6, this Agreement shall forthwith become wholly
void and of no effect, and the parties shall be released from all future
obligations hereunder, except that the provisions of Section 7.4 (Governing
Law) shall survive the termination of this Agreement; provided, however, that
nothing herein shall relieve any party for any material breach of any of its or
his representations, warranties, covenants or agreements under this Agreement.

                                   ARTICLE 7

                                 MISCELLANEOUS

     7.1   Descriptive Headings.  The descriptive headings herein are inserted
for convenience only and are not intended to be part of or to affect the
meaning or interpretation of this Agreement.

     7.2   Counterparts.  This Agreement may be executed in counterparts, each 
of which when so executed and delivered shall be an original, but all of such
counterparts shall together constitute one and the same instrument.


                                    - 6 -


<PAGE>   7





     7.3 Entire Agreement; Assignment.  This Agreement (i) constitutes the
entire agreement and supersedes all prior agreements and understandings, both
written and oral, among the parties hereto with respect to the subject matter
hereof and (ii) shall not be assigned by any party hereto by operation of law
or otherwise, without the prior written consent of each other party hereto;
provided, however, that Purchaser may assign this Agreement without consent of
the Stockholders to any affiliate of Purchaser.

     7.4 Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF MARYLAND WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAWS THEREOF.

     7.5 Specific Performance.  The parties hereto agree that if any of the
provisions of this Agreement were not performed in accordance with their
specific terms or were otherwise breached, irreparable damage would occur, no
adequate remedy at law would exist and damages would be difficult to determine,
and that the parties shall be entitled to specific performance of the terms
hereof, in addition to any other remedy at law or equity.

     7.6 Parties in Interest.  This Agreement shall be binding upon and inure
solely to the benefit of each party hereto, and nothing in this Agreement,
express or implied, is intended to or shall confer upon any other person or
persons any rights, benefits or remedies of any nature whatsoever under or by
reason of this Agreement.

     7.7 Amendment; Waivers.  This Agreement shall not be amended, altered or
modified except by an instrument in writing duly executed by each of the
parties hereto.  No delay or failure on the part of any party hereto in
exercising any right, power or privilege under this Agreement shall impair any
such right, power or privilege or be construed as a waiver of any default or
any acquiescence thereto.  No single or partial exercise of any such right,
power or privilege shall preclude the further exercise of such right, power or
privilege, or the exercise of any other right, power or privilege.  No waiver
shall be valid against any party hereto, unless made in writing and signed by
the party against whom enforcement of such waiver is sought, and then only to
the extent expressly specified therein.


                                    - 7 -

<PAGE>   8




     IN WITNESS WHEREOF, the parties have executed this Agreement on the date
first above written.

                                           EQUITY OFFICE PROPERTIES MANAGEMENT
                                           CORP.


                                           By: /s/ Stanley M. Stevens
                                              ---------------------------------
                                           Name: Stanley M. Stevens
                                                -------------------------------
                                           Title: V.P.
                                                 ------------------------------
Stockholders:


/s/ Norman B. Leventhal, Trustee
- --------------------------------
Name: Norman B. Leventhal,
- --------------------------------
as Voting Trustee u/t/a
dated March 6, 1989


                                    - 8 -




<PAGE>   9



                                                                      Exhibit A


<TABLE>
<CAPTION>
Name of Stockholder  Number of Voting Shares
- -------------------  -----------------------
<S>                                    <C>
Norman B. Leventhal                    990
as voting Trustee u/t/a
dated March 6, 1989
</TABLE>

















<PAGE>   1

                                                                  Exhibit 10.9



                          STOCK PURCHASE AGREEMENT


     THIS STOCK PURCHASE AGREEMENT (the "Agreement"), dated as of September 14,
1997, is made and entered into among Equity Office Properties Management Corp.,
a Delaware corporation ("Purchaser"), and the undersigned stockholders (each, a
"Stockholder," and collectively, the "Stockholders") of Beacon Construction
Company, Inc., a Massachusetts corporation (the "Company").

     WHEREAS, Equity Office Properties Trust, a Maryland real estate investment
trust ("Equity Office Properties"), Equity Office Properties Operating Limited
Partnership, a Delaware limited partnership ("Equity Office Properties
Partnership"), Beacon Properties Corporation, a Maryland corporation
("Beacon"), and Beacon Properties, L.P., a Delaware limited partnership
("Beacon Partnership"), have on the date hereof entered into an Agreement and
Plan of Merger (the "Merger Agreement") pursuant to which Beacon shall be
merged with and into Equity Office Properties and Beacon Partnership shall be
merged with and into Equity Office Properties Partnership (the "Mergers");

     WHEREAS, the authorized capital stock of the Company consists of (i) one
thousand (1,000) shares, $.01 par value per share (the "Voting Shares"), of
which nine hundred ninety (990) shares are issued and outstanding and owned by
the Stockholders as set forth on Exhibit A and ten (10) shares of which are
issued and outstanding and owned by Beacon Partnership, and (ii) one thousand
(1,000) shares of non voting stock, $.01 par value per share, of which one
thousand (1,000) shares are issued and outstanding and owned by Beacon
Partnership; and

     WHEREAS, as an inducement to Equity Office Properties and Equity Office
Properties Partnership to enter into the Merger Agreement, the Stockholders
have agreed to sell all of the outstanding Voting Shares held by them to
Purchaser.

     NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

                                  ARTICLE 1

                              SALE AND PURCHASE

     1.1 Sale of Voting Shares.  Subject to, and in consideration of, the terms
and conditions of this Agreement, at the Closing (as defined in Article 2),
each Stockholder shall sell, and Purchaser shall purchase, all right, title and
interest of such Stockholder in the Voting Shares set forth opposite such
Stockholder's name on Exhibit A.  At the Closing, each Stockholder shall
deliver or cause to be delivered to Purchaser, stock certificates representing
the Voting Shares set forth opposite such Stockholder's name on Exhibit A, duly
endorsed in blank or accompanied by 




<PAGE>   2




stock powers duly executed in blank, in proper form for transfer, with all
appropriate stock transfer tax stamps affixed.

     1.2 Purchase Price; Delivery.  In consideration of the sale, assignment,
transfer, conveyance and delivery described above, at the Closing Purchaser
will pay each Stockholder in immediately available funds an amount equal to (i)
the number of Voting Shares set forth opposite such Stockholder's name on
Exhibit A hereto, multiplied by (ii) the fair market value per Voting Share as
determined by the parties hereto (or, if the parties are unable to so agree,
based upon an appraisal by an independent appraiser unaffiliated with any party
hereto in a manner consistent with industry practice).

                                  ARTICLE 2

                                   CLOSING

     2.1 Closing; Closing Date.  Subject to the satisfaction or waiver of the
conditions set forth in Article 5, the closing of the sale and purchase of the
Voting Shares (the "Closing") shall take place on the same date, and at the
same time and place, as the closing under the Merger Agreement, or at such
other time and place as shall be agreed upon by the parties.  The time and date
of the Closing shall be referred to as the "Closing Date."

                                  ARTICLE 3

                       REPRESENTATIONS AND WARRANTIES

     3.1 Representations and Warranties of Stockholders.   Each Stockholder
represents and warrants to Purchaser as to itself or himself as follows:

     (a) Title.  Such Stockholder is, and on the Closing Date will be, the
beneficial and record owner of the Voting Shares set forth opposite such
Stockholder's name on Exhibit A, free and clear of all pledges, liens,
encumbrances, restrictions, voting agreements or trusts, rights, claims or
charges of any nature or kind whatsoever (collectively, "Claims").  Upon
delivery to Purchaser of the certificate or certificates representing such
Voting Shares duly endorsed in blank for transfer or with stock powers attached
duly executed in blank, against delivery of the Purchase Price, good and valid
title to such Voting Shares shall be transferred to Purchaser free and clear of
any and all Claims.

     (b) Capacity.  Such Stockholder has full legal right, capacity, authority
and power to execute and deliver this Agreement and to consummate the
transactions contemplated hereby.

     (c) Binding Obligation.  This Agreement has been duly executed and
delivered by such Stockholder and constitutes such Stockholder's legal, valid
and binding obligation, enforceable against such Stockholder in accordance with
and subject to its terms, subject to ap-


                                    - 2 -


<PAGE>   3




plicable bankruptcy, insolvency, moratorium or other similar laws
relating to creditors' rights and general principles of equity.

     (d) Non-Contravention.  Neither the execution and delivery by such
Stockholder of this Agreement nor the consummation by such Stockholder of the
transactions contemplated hereby conflict with, or result in any breach of,
constitute a default under, permit the termination of, or result in the
acceleration of any indebtedness under, any agreement, contract, lease,
promissory note, indenture, covenant or other arrangement to which such
Stockholder is a party or by which such Stockholder is, or such Stockholder's
assets are, bound.

     3.2 Representations and Warranties of Purchaser.  Purchaser represents and
warrants to each Stockholder as follows:

     (a) Organization and Standing.  Purchaser (i) is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, (ii) has the full and unrestricted corporate power and corporate
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby and (iii) has the full and unrestricted
corporate power and authority to own, operate and lease its properties and to
carry on its business.

     (b) Authorization.  The execution and delivery of this Agreement by
Purchaser, and the consummation by Purchaser of the transactions contemplated
hereby, have been duly and validly authorized by all necessary corporate or
other action on the part of Purchaser.

     (c) Binding Obligation.  This Agreement has been duly executed and
delivered by Purchaser and constitutes Purchaser's legal, valid and binding
obligation, enforceable against Purchaser in accordance with and subject to its
terms, subject to applicable bankruptcy, insolvency, moratorium or other
similar laws relating to creditors' rights and general principles of equity.

     (d) Non-Contravention.  Neither the execution and delivery by Purchaser of
this Agreement nor the consummation by Purchaser of the transactions
contemplated hereby conflict with, or result in any breach of, constitute a
default under, permit the termination of, or result in the acceleration of any
indebtedness under, any agreement, contract, lease, promissory note, indenture,
covenant or other arrangement to which Purchaser is a party or by which it is,
or its assets are, bound.

     (e) Purchase of Voting Shares.  Purchaser is purchasing the Voting Shares
for its own account and not with a view toward, or for resale in connection
with, any distribution thereof.


                                    - 3 -


<PAGE>   4





                                  ARTICLE 4

                                  COVENANTS

     4.1 Filings under HSR Act.  Purchaser and each Stockholder shall use all
reasonable best efforts to cooperate with one another in determining, no later
than ten (10) days from the date hereof whether any filings are required under
the HSR Act in connection with this Agreement, and as soon as practicable upon
making any determination that such filings are required, and in any event
within fifteen (15) days after making such determination, shall make all
necessary filings under the HSR Act and shall cooperate in attempts to secure
early termination of the applicable waiting period.

     4.2 Conduct of Company Business.  From and after the date hereof, no
Stockholder shall take any action, the result of which would be to cause the
Company to conduct its business other than in the ordinary course consistent
with past practice (including, without limitation, the declaration, setting
aside or payment of any dividend or distribution with respect to the Company's
capital stock).  Without limiting the generality of the foregoing, no
Stockholder shall approve (i) the issuance by the Company of any capital stock
or any options, warrants or other rights to subscribe for or purchase any of
the Company's capital stock or any securities convertible into or exchangeable
for the Company's capital stock, (ii) the direct or indirect redemption,
purchase or other acquisition of any of the Company's capital stock, (iii) a
split, reclassification or other change in or of any of the Company's capital
stock, or (iv) any amendment of the Company's articles of incorporation or
bylaws.

     4.3 Additional Actions and Documents.  Each of the parties hereby agrees
to take or cause to be taken such further actions and to execute, deliver and
file or cause to be executed, delivered and filed, such further documents as
may be necessary or as may be reasonably requested in order to fully effectuate
the purposes, terms and conditions of this Agreement.

                                  ARTICLE 5

                            CONDITIONS TO CLOSING

     5.1 Conditions to the Obligations of Purchaser.  The obligations of
Purchaser under this Agreement are subject to the fulfillment, at or prior to
the Closing, of each of the following conditions:

     (a) The representations and warranties made by each of the Stockholders in
this Agreement shall be true and correct when made, and on and as of the
Closing Date as though such representations and warranties were made on and as
of the Closing Date.

     (b) Each Stockholder shall have performed and complied with all covenants
and conditions required by this Agreement to be performed or complied with by
it or him or all one or more Stockholders collectively prior to the Closing
Date.



                                     - 4 -


<PAGE>   5





     (c) No action or proceeding by or before any governmental authority shall
have been instituted or threatened (and not subsequently settled, dismissed or
otherwise terminated) which is reasonably expected to restrain, prohibit or
invalidate the transactions contemplated by this Agreement other than an action
or proceeding instituted or threatened by Purchaser.

     (d) Each Stockholder shall have delivered to Purchaser a certificate,
dated as of the Closing Date and executed by such Stockholder, certifying, as
to such Stockholder, the fulfillment of the conditions specified in Sections
5.1(a) and (b).

     (e) Any and all applicable waiting periods under the HSR Act shall have
expired.

     (f) Each of the parties to the Merger Agreement shall have certified to
Purchaser that all conditions to the closing of the transactions thereunder
have been waived or satisfied.

     5.2 Conditions to the Obligations of each Stockholder.  The obligations of
each Stockholder under this Agreement are subject to the fulfillment, at or
prior to the Closing, of each of the following conditions:

     (a) The representations and warranties made by Purchaser in this Agreement
shall be true and correct when made, and on and as of the Closing Date as
though such representations and warranties were made on and as of the Closing
Date.

     (b) Purchaser shall have performed and complied with all covenants and
conditions required by this Agreement to be performed or complied with by it
prior to the Closing Date.

     (c) No action or proceeding by or before any governmental authority shall
have been instituted or threatened (and not subsequently settled, dismissed or
otherwise terminated) which is reasonably expected to restrain, prohibit or
invalidate the transactions contemplated by this Agreement other than an action
or proceeding instituted or threatened by one or more of the Company or one or 
more Stockholders.

     (d) Purchaser shall have delivered to the Stockholders a certificate,
dated as of the Closing Date and executed by Purchaser, certifying, as to such
Stockholder, the fulfillment of the conditions specified in Sections 5.2 (a)
and (b).

     (e) Any and all applicable waiting periods under the HSR Act shall have
expired.

     (f) Each of the parties to the Merger Agreement shall have certified to
the Stockholders that all conditions to the closing of the transactions
thereunder have been waived or satisfied.




                                    - 5 -


<PAGE>   6




                                  ARTICLE 6

                                 TERMINATION

     6.1   Events of Termination.  (a) This Agreement may be terminated at any
time before the Closing Date under any one or more of the following
circumstances:

     (i)   by the mutual written consent of all of the parties hereto;

     (ii)  by Purchaser, if any Stockholder shall have breached, or failed to
comply with, in any material respect any of its or his respective obligations
under this Agreement or any representation or warranty made by it or him shall
have been incorrect when made or shall have since ceased to be true and
correct;

     (iii) by the Stockholders, if Purchaser shall have breached, or failed to
comply with, in any material respect any of its obligations under this
Agreement or any representation or warranty made by Purchaser shall have been
incorrect when made or shall have since ceased to be true and correct; or

     (iv)  by Purchaser or the Stockholders, if any decree, permanent
injunction, judgment, order or other action by any court of competent
jurisdiction or any governmental or regulatory authority preventing or
prohibiting consummation of the transactions contemplated hereby shall have
become final and non-appealable.

     (b)   This Agreement shall terminate immediately upon the termination of 
the Merger Agreement.

     6.2   Effect of Termination.  In the event this Agreement is terminated as
provided in this Article 6, this Agreement shall forthwith become wholly
void and of no effect, and the parties shall be released from all future
obligations hereunder, except that the provisions of Section 7.4 (Governing
Law) shall survive the termination of this Agreement; provided, however, that
nothing herein shall relieve any party for any material breach of any of its or
his representations, warranties, covenants or agreements under this Agreement.

                                   ARTICLE 7

                                 MISCELLANEOUS

     7.1 Descriptive Headings.  The descriptive headings herein are inserted
for convenience only and are not intended to be part of or to affect the
meaning or interpretation of this Agreement.

     7.2 Counterparts.  This Agreement may be executed in counterparts, each of
which when so executed and delivered shall be an original, but all of such
counterparts shall together constitute one and the same instrument.



                                     - 6 -


<PAGE>   7



     7.3 Entire Agreement; Assignment.  This Agreement (i) constitutes the
entire agreement and supersedes all prior agreements and understandings, both
written and oral, among the parties hereto with respect to the subject matter
hereof and (ii) shall not be assigned by any party hereto by operation of law
or otherwise, without the prior written consent of each other party hereto;
provided, however, that Purchaser may assign this Agreement without consent of
the Stockholders to any affiliate of Purchaser.

     7.4 Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF MARYLAND WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAWS THEREOF.

     7.5 Specific Performance.  The parties hereto agree that if any of the
provisions of this Agreement were not performed in accordance with their
specific terms or were otherwise breached, irreparable damage would occur, no
adequate remedy at law would exist and damages would be difficult to determine,
and that the parties shall be entitled to specific performance of the terms
hereof, in addition to any other remedy at law or equity.

     7.6 Parties in Interest.  This Agreement shall be binding upon and inure
solely to the benefit of each party hereto, and nothing in this Agreement,
express or implied, is intended to or shall confer upon any other person or
persons any rights, benefits or remedies of any nature whatsoever under or by
reason of this Agreement.

     7.7 Amendment; Waivers.  This Agreement shall not be amended, altered or
modified except by an instrument in writing duly executed by each of the
parties hereto.  No delay or failure on the part of any party hereto in
exercising any right, power or privilege under this Agreement shall impair any
such right, power or privilege or be construed as a waiver of any default or
any acquiescence thereto.  No single or partial exercise of any such right,
power or privilege shall preclude the further exercise of such right, power or
privilege, or the exercise of any other right, power or privilege.  No waiver
shall be valid against any party hereto, unless made in writing and signed by
the party against whom enforcement of such waiver is sought, and then only to
the extent expressly specified therein.


                                    - 7 -


<PAGE>   8



     IN WITNESS WHEREOF, the parties have executed this Agreement on the date
first above written.

                                           EQUITY OFFICE PROPERTIES MANAGEMENT
                                           CORP.


                                           By: /s/ Stanley M. Stevens
                                              ---------------------------------
                                           Name: Stanley M. Stevens
                                           ------------------------------------
                                           Title: V.P.
                                                  -----------------------------
Stockholders:

/s/ Norman B. Leventhal, Trustee
- --------------------------------
Name: Norman B. Leventhal
- --------------------------------
as Voting Trustee u/t/a
dated March 6, 1989

                                    - 8 -




<PAGE>   9





                                                                      Exhibit A


<TABLE>

Name of Stockholder   Number of Voting Shares
- --------------------  -----------------------
<S>                                      <C>
Norman B. Leventhal,                     990
as voting Trustee u/t/a
dated  March 6, 1989
</TABLE>




<PAGE>   1
                                                                EXHIBIT 23.2


                       Consent of Independent Auditors

We consent to the reference to our firm under the caption "Experts" and to the
use of our reports indicated below in this registration statement on Form S-4
of EOP Operating Limited Partnership.


                                                         DATE OF AUDITOR'S
                FINANCIAL STATEMENTS                         REPORTS 
- -------------------------------------------------------------------------------
Combined Financial Statements of Equity Office              March 25, 1997
Predecessors as of December 31, 1996 and 1995
and for each of the three years in the period 
ended December 31, 1996

Statement of Revenue and Certain Expenses of                March 28, 1997
177 Broad Street for the year ended 
December 31, 1996

Statement of Revenue and Certain Expenses                   April 16, 1997
of Preston Commons for the year ended
December 31, 1996

Statement of Revenue and Certain Expenses                   May 30, 1997
of Oakbrook Terrace Tower for the year
ended December 31, 1996

Statement of Revenue and Certain Expenses                   June 6, 1997
of One Maritime Plaza for the year
ended December 31, 1996

Statement of Revenue and Certain Expenses of                April 30, 1997
201 Mission Street for the year ended
December 31, 1996

Statement of Revenue and Certain Expenses of                June 13, 1997
30 N. LaSalle for the year ended      
December 31, 1996

Combined Statement of Revenue and Certain                   September 3, 1997
Expenses of the Columbus America Properties
for the year ended December 31, 1996

Combined Statement of Revenue and Certain                   September 3, 1997
Expenses of the Prudential Properties for
the year ended December 31, 1996

Statement of Revenue and Certain Expenses of                September 24, 1997
550 South Hope Street for the year ended
March 31, 1997
<PAGE>   2


                                                             DATE OF AUDITOR'S
        FINANCIAL STATEMENTS                                       REPORT
- ------------------------------------------------------------------------------- 


Combined Statement of Revenue and Certain Expenses of the     September 9, 1997
Acorn Properties for the year ended December 31, 1996

Combined Statement of Revenue and Certain Expenses of 10      September 5, 1997 
& 30 South Wacker Drive for the year ended December 31, 
1996

Combined Statement of Revenue and Certain Expenses of the     January 22, 1997  
PPM Properties for the year ended December 31, 1996

Statement of Revenue and Certain Expenses of One Lafayette    September 5, 1997
Centre for the year ended December 31, 1996





                                                           ERNST & YOUNG LLP




Chicago, Illinois
November 14, 1997       

<PAGE>   1

                                                                EXHIBIT 23.3

                      CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the inclusion in this Registration Statement on Form S-4 of our
report dated January 21, 1997, on our audits of the consolidated balance sheets 
of Beacon Properties, L.P. (the "Operating Partnership") as of December 31,
1996 and 1995 and the related consolidated statements of operations, partners'
capital and cash flows for the years ended December 31, 1996 and 1995 and for
the period May 26, 1994 to December 31, 1994, and the combined results of
operations and cash flows of The Beacon Group, predecessor to the Operating
Partnership, for the period January 1, 1994 to May 25, 1994.

We also consent to the inclusion of our report dated May 29, 1997 on our audit
of the statement of excess of revenues over specific operating expenses of 225
Franklin Street in Boston, Massachusetts for the year ended December 31, 1996.

We also consent to the references to our Firm under the caption "Experts".




                                                COOPERS & LYBRAND L.L.P.


Boston, Massachusetts
November 13, 1997

<PAGE>   1
                                                                    EXHIBIT 23.6



[MORGAN STANLEY LETTERHEAD]





We hereby consent to (i) the use of our opinion letter dated September 15, 1997
to the Board of Directors of Beacon Properties Corporation (the "Company")
included as Annex II to the Proxy Statement/Prospectus which forms a part of
the Registration Statement on Form S-4 relating to the proposed merger of
Beacon Properties, L.P. and EOP Operating Limited Partnership and (ii) the
references to such opinion in such Proxy Statement/Prospectus.  In giving such
consent, we do not admit that we come within the category of persons whose
consent is required under Section 7 of the Securities Act of 1933, as amended,
or the rules and regulations of the Securities and Exchange Commission
thereunder, nor do we hereby admit that we are experts with respect to any part
of such Registration Statement within the meaning of the term "experts" as used
in the Securities Act of 1933, as amended, or the rules and regulations of the
Securities and Exchange Commission thereunder.

MORGAN STANLEY REALTY INCORPORATED



By: /s/ Thomas A. Grier
   --------------------------------------------------
   Name: Thomas A. Grier
   Title: Principal

November 7, 1997

<TABLE> <S> <C>

<ARTICLE> 5
<CIK> 0001043866
<NAME> EOP Operating Limited Partnership
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                         175,615
<SECURITIES>                                         0
<RECEIVABLES>                                   16,190
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               163,958
<PP&E>                                       5,022,946
<DEPRECIATION>                                  22,787
<TOTAL-ASSETS>                               5,355,922
<CURRENT-LIABILITIES>                          175,712
<BONDS>                                      1,716,458
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                   3,463,752
<TOTAL-LIABILITY-AND-EQUITY>                 5,355,922
<SALES>                                              0
<TOTAL-REVENUES>                               519,590
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                               307,199
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             103,687
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                 13,204
<CHANGES>                                            0
<NET-INCOME>                                    95,500
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                        0
        

</TABLE>

<PAGE>   1
PROXY
                           BEACON PROPERTIES, L.P.
                  50 ROWES WHARF, 6TH FLOOR, BOSTON, MA 02110
   PROXY FOR SPECIAL MEETING OF UNITHOLDERS TO BE HELD ON DECEMBER 19, 1997

                THIS PROXY IS SOLICITED BY THE GENERAL PARTNER

         The undersigned hereby constitutes and appoints Edwin N. Sidman, Alan
M. Leventhal and Lionel P. Fortin, and each of them, as Proxies of the
undersigned, with full power of substitution, to vote all units of partnership
interest in Beacon Properties, L.P. ("Beacon Partnership") held of record by the
undersigned as of the close of business on November 14, 1997, on behalf of the
undersigned at the Special Meeting of Unitholders (the "Special Meeting") to
be held at State Street Bank, 225 Franklin Street, Boston, Massachusetts, 9:30
a.m., Boston time, on December 19, 1997, and at any adjournments or 
postponements thereof.

         WHEN PROPERLY EXECUTED, THIS PROXY WILL BE VOTED IN THE MANNER
DIRECTED HEREIN BY THE UNDERSIGNED UNITHOLDER(S).  IF NO DIRECTION IS GIVEN,
THIS PROXY WILL BE VOTED FOR PROPOSALS 1 AND 2.  IN THEIR DISCRETION, THE 
PROXIES ARE EACH AUTHORIZED TO VOTE UPON SUCH OTHER BUSINESS AS MAY PROPERLY 
COME BEFORE THE SPECIAL MEETING AND AT ANY ADJOURNMENTS OR POSTPONEMENTS 
THEREOF.  ANY UNITHOLDER WISHING TO VOTE IN ACCORDANCE WITH THE GENERAL
PARTNER'S RECOMMENDATIONS NEED ONLY SIGN AND DATE THIS PROXY AND RETURN IT IN 
THE ENCLOSED ENVELOPE.
                                                                    

        PLEASE VOTE AND SIGN ON OTHER SIDE AND RETURN PROMPTLY IN   SEE REVERSE
                          THE ENCLOSED ENVELOPE.                        SIDE



/X/      PLEASE MARK VOTES AS IN THIS EXAMPLE

         1.      To consider and vote upon a proposal to approve the merger
(the "Partnership Merger") of Beacon Partnership with and into EOP
Operating Limited Partnership, a Delaware limited partnership ("EOP
Partnership"), and the Agreement and Plan of Merger, dated as of September 15,
1997, as amended (the "Agreement"), by and between Beacon Properties
Corporation, a Maryland corporation ("Beacon"), Beacon Partnership, Equity 
Office Properties Trust, a Maryland real estate investment trust ("EOP"), and
EOP Partnership. Pursuant to the Agreement, Beacon Partnership will merge with
and into EOP Partnership, with EOP Partnership being the surviving
partnership.  As a result of the Partnership Merger, Beacon Partnership 
unitholders will be entitled to receive 1.4063 Class A Units of EOP Partnership
for each Beacon Partnership unit (other than any preferred units) held by them
at the effective time of the Partnership Merger.

                 / /  FOR        / /  AGAINST        / /  ABSTAIN

         2.      To consider and vote upon a proposal to approve the transfer
by Beacon of its partnership interests in Beacon Partnership to EOP and its
withdrawal as general partner of Beacon Partnership, which will occur as a
result of the merger of Beacon with and into EOP, with EOP being the surviving
company and the managing general partner of EOP Partnership.

                 / /  FOR        / /  AGAINST        / /  ABSTAIN

         3.      To consider and act upon any other matters that may properly
be brought before the Special Meeting and at any adjournments or postponements
thereof.

         The undersigned hereby acknowledge(s) receipt of a copy of the
accompanying Notice of Special Meeting of Unitholders and the Proxy 
Statement/Prospectus related thereto prior to the execution of this proxy.  The
undersigned hereby revoke(s) any proxy or proxies heretofore given.  This proxy
may be revoked at any time before it is exercised.

<TABLE>
<S><C>
Dated:______________________________                                   
                                                           NOTE:    Please sign exactly as your name appears
                                                                    on the envelope in which this card was
Print Name:                                                         mailed.  When signing as attorney,
                                                                    executor, administrator, trustee or
____________________________________                                guardian, please give your full title.  If
Signature                                                           more than one trustee, all should sign.  If
                                                                    units are held jointly, each holder should
Print Name:                                                         sign.

____________________________________
Signature
         
</TABLE>

<PAGE>   1
 
                                                                    EXHIBIT 99.2
 
                            BEACON PROPERTIES, L.P.
                           50 ROWES WHARF, 6TH FLOOR
                          BOSTON, MASSACHUSETTS 02110
 
                                                               November   , 1997
 
Dear Unitholder:
 
     You are cordially invited to attend a Special Meeting of Unitholders of
Beacon Properties, L.P. ("Beacon Partnership") to be held on December 19, 1997,
at 9:30 a.m., Boston time, at State Street Bank, 225 Franklin Street, Boston,
Massachusetts (the "Beacon Partnership Special Meeting").
 
     At the Beacon Partnership Special Meeting, you will be asked to vote upon
certain matters relating to the Agreement and Plan of Merger, dated as of
September 15, 1997, as amended (the "Agreement"), by and among Beacon Properties
Corporation ("Beacon"), Beacon Partnership, Equity Office Properties Trust
("EOP") and EOP Operating Limited Partnership ("EOP Partnership"), and the
transactions contemplated thereby. Pursuant to the Agreement, Beacon Partnership
will merge with and into EOP Partnership, with EOP Partnership being the
surviving partnership (the "Partnership Merger"), and Beacon will merge with and
into EOP, with EOP being the surviving company and the managing general partner
of EOP Partnership (the "Company Merger," and together with the Partnership
Merger, the "Mergers"). In connection with the Mergers, you are being asked to
approve (i) the Partnership Merger and (ii) the transfer by Beacon of its
partnership interests in Beacon Partnership to EOP and the withdrawal of Beacon
as general partner of Beacon Partnership which will occur as a result of the
Company Merger. As a result of the Partnership Merger, you will be entitled to
receive 1.4063 Class A Units of EOP Partnership for each Beacon Partnership unit
held by you at the effective time of the Partnership Merger. The Partnership
Merger must be approved by the affirmative vote of holders of 85% of the units
of limited partnership interest of Beacon Partnership entitled to vote thereon.
The transfer of Beacon's partnership interests in Beacon Partnership to EOP and
Beacon's withdrawal as general partner of Beacon Partnership must be approved by
the vote of holders of a majority of such units (excluding any units held by
Beacon).
 
     THE BOARD OF DIRECTORS OF BEACON, THE SOLE GENERAL PARTNER OF BEACON
PARTNERSHIP, BELIEVES THAT THE MERGERS ARE FAIR TO, AND IN THE BEST INTERESTS
OF, BEACON PARTNERSHIP AND ITS UNITHOLDERS. THE BOARD OF DIRECTORS OF BEACON HAS
UNANIMOUSLY APPROVED, AND UNANIMOUSLY RECOMMENDS THAT YOU VOTE TO APPROVE, THE
PARTNERSHIP MERGER, THE AGREEMENT, THE TRANSFER OF BEACON'S PARTNERSHIP
INTERESTS IN BEACON PARTNERSHIP AND BEACON'S WITHDRAWAL AS GENERAL PARTNER OF
BEACON PARTNERSHIP.
 
     The accompanying Proxy Statement/Prospectus provides detailed information
concerning the proposed Mergers, the reasons for the Board of Directors'
recommendation of the Mergers and the Agreement and certain additional
information, including, without limitation, information about Beacon, EOP,
Beacon Partnership and EOP Partnership. We urge you to carefully consider all of
the information in the Proxy Statement/Prospectus. IT IS IMPORTANT THAT YOUR
BEACON PARTNERSHIP UNITS BE REPRESENTED AT THE BEACON PARTNERSHIP SPECIAL
MEETING, REGARDLESS OF THE NUMBER OF UNITS YOU HOLD. THEREFORE, PLEASE COMPLETE,
SIGN, DATE AND RETURN YOUR PROXY CARD AS SOON AS POSSIBLE, WHETHER OR NOT YOU
PLAN TO ATTEND THE BEACON PARTNERSHIP SPECIAL MEETING. THIS WILL NOT PREVENT YOU
FROM VOTING YOUR UNITS IN PERSON IF YOU SUBSEQUENTLY CHOOSE TO ATTEND THE BEACON
PARTNERSHIP SPECIAL MEETING.
 
                                          Sincerely,
 
                                          BEACON PROPERTIES CORPORATION,
                                          as general partner of Beacon
                                          Properties, L.P.
 
                                          EDWIN N. SIDMAN
                                          Chairman of the Board

<PAGE>   1
 
                                                                    EXHIBIT 99.3
 
                            BEACON PROPERTIES, L.P.
                           50 ROWES WHARF, 6TH FLOOR
                          BOSTON, MASSACHUSETTS 02110
 
                    NOTICE OF SPECIAL MEETING OF UNITHOLDERS
                        TO BE HELD ON DECEMBER 19, 1997
 
To the Unitholders of Beacon Properties, L.P.:
 
     NOTICE IS HEREBY GIVEN that a Special Meeting of Unitholders of Beacon
Properties, L.P., a Delaware limited partnership ("Beacon Partnership"), will be
held at 9:30 a.m., Boston time, on December 19, 1997, at State Street Bank, 225
Franklin Street, Boston, Massachusetts (the "Beacon Partnership Special
Meeting") for the following purposes:
 
          1. To consider and vote upon a proposal to approve the merger (the
     "Partnership Merger") of Beacon Partnership with and into EOP Operating
     Limited Partnership, a Delaware limited partnership ("EOP Partnership"),
     and the Agreement and Plan of Merger, dated as of September 15, 1997, as
     amended (the "Agreement"), by and between Beacon Properties Corporation, a
     Maryland corporation, Beacon Partnership, Equity Office Properties Trust, a
     Maryland real estate investment trust, and EOP Partnership. Pursuant to the
     Agreement, Beacon Partnership will merge with and into EOP Partnership,
     with EOP Partnership being the surviving partnership. As a result of the
     Partnership Merger, Beacon Partnership unitholders will be entitled to
     receive 1.4063 Class A Units of EOP Partnership for each Beacon Partnership
     unit (other than any preferred units) held by them at the effective time of
     the Partnership Merger. A copy of the Agreement is attached as Annex I to
     the Proxy Statement/Prospectus accompanying this Notice;
 
          2. To consider and vote upon a proposal to approve the transfer by
     Beacon of its partnership interests in Beacon Partnership to EOP and its
     withdrawal as general partner of Beacon Partnership, which will occur as a
     result of the merger of Beacon with and into EOP, with EOP being the
     surviving company and the managing general partner of EOP Partnership
     (together with the Partnership Merger, the "Mergers"); and
 
          3. To transact any other business as may properly come before the
     meeting or any adjournments or postponements thereof.
 
     The Mergers, the Agreement and other related matters are more fully
described in the accompanying Proxy Statement/Prospectus, and the Annexes
thereto, which form a part of this Notice.
 
     ALL UNITHOLDERS ARE CORDIALLY INVITED TO ATTEND THE BEACON PARTNERSHIP
SPECIAL MEETING. TO ENSURE YOUR REPRESENTATION AT THE BEACON PARTNERSHIP SPECIAL
MEETING, HOWEVER, YOU ARE URGED TO COMPLETE, DATE, SIGN AND RETURN THE ENCLOSED
PROXY AS PROMPTLY AS POSSIBLE. A POSTAGE-PREPAID ENVELOPE IS ENCLOSED FOR THAT
PURPOSE. ANY UNITHOLDER ATTENDING THE BEACON PARTNERSHIP SPECIAL MEETING MAY
VOTE IN PERSON EVEN IF THAT UNITHOLDER HAS RETURNED A PROXY.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS OF
                                          BEACON PROPERTIES CORPORATION,
                                          as general partner of Beacon
                                          Properties, L.P.
 
                                          KATHLEEN M. MCCARTHY
                                          Secretary
 
November   , 1997

<PAGE>   1
                                                                EXHIBIT 99.4


       Consent to be Named as a Trustee of Equity Office Properties Trust


     I hereby consent to be named as a person to become a trustee of Equity
Office Properties Trust, a Maryland real estate investment trust ("EOP"), in
the registration statement on Form S-4 filed by EOP Operating Limited
Partnership with the Securities and Exchange Commission in connection with the 
merger of Beacon Properties, L.P. with and into EOP Operating Limited
Partnership.




                                             /s/ Alan M. Leventhal
                                             -----------------------
                                             Alan M. Leventhal
                                             Date:  October 6, 1997

<PAGE>   1
                                                                EXHIBIT 99.5



       Consent to be Named as a Trustee of Equity Office Properties Trust


     I hereby consent to be named as a person to become a trustee of Equity
Office Properties Trust, a Maryland real estate investment trust ("EOP"), in
the registration statement on Form S-4 filed by EOP Operating Limited
Partnership with the Securities and Exchange Commission in connection with the 
merger of Beacon Properties, L.P. with and into EOP Operating Limited
Partnership.




                                              /s/ Edwin N. Sidman
                                              -----------------------
                                              Edwin N. Sidman
                                              Date:  October 6, 1997






© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission