BOSTON PROPERTIES INC
S-11, 1997-12-04
REAL ESTATE
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<PAGE>
 
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 3, 1997
 
                                           REGISTRATION STATEMENT NO. 333-
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                                ---------------
 
                                   FORM S-11
 
                            REGISTRATION STATEMENT
 
                                     UNDER
 
                          THE SECURITIES ACT OF 1933
 
                OF SECURITIES OF CERTAIN REAL ESTATE COMPANIES
 
                                ---------------
 
                            BOSTON PROPERTIES, INC.
     (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS GOVERNING INSTRUMENTS)
 
                              8 ARLINGTON STREET
                          BOSTON, MASSACHUSETTS 02116
                                (617) 859-2600
                   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
 
                                ---------------
 
                        MORTIMER B. ZUCKERMAN, CHAIRMAN
            EDWARD H. LINDE, PRESIDENT AND CHIEF EXECUTIVE OFFICER
                            BOSTON PROPERTIES, INC.
                              8 ARLINGTON STREET
                          BOSTON, MASSACHUSETTS 02116
                                (617) 859-2600
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
 
                                ---------------
 
                                  COPIES TO:
 
       GILBERT G. MENNA, P.C.                WALLACE L. SCHWARTZ, ESQ.
      EDWARD M. SCHULMAN, ESQ.               SUSAN J. SUTHERLAND, ESQ.
    GOODWIN, PROCTER & HOAR LLP                SKADDEN, ARPS, SLATE,
        599 LEXINGTON AVENUE                    MEAGHER & FLOM LLP
      NEW YORK, NEW YORK 10022                   919 THIRD AVENUE
           (212) 813-8800                    NEW YORK, NEW YORK 10022
                                                  (212) 735-3000
 
                                ---------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF THE PROPOSED SALE OF THE SECURITIES TO
THE PUBLIC: As soon as practicable after this Registration Statement becomes
effective.
 
                                ---------------
 
                        CALCULATION OF REGISTRATION FEE
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- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                 PROPOSED       PROPOSED
                                                 AMOUNT          MAXIMUM         MAXIMUM      AMOUNT OF
           TITLE OF EACH CLASS OF                 TO BE       OFFERING PRICE    AGGREGATE    REGISTRATION
        SECURITIES TO BE REGISTERED           REGISTERED(1)     PER SHARE    OFFERING PRICE      FEE
- ---------------------------------------------------------------------------------------------------------
 <S>                                        <C>               <C>            <C>             <C>
 Common Stock, $.01 par value............   16,100,000 shares   $32.875(2)   $529,287,500(2)   $156,140
</TABLE>
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
(1) Includes 2,100,000 shares of Common Stock that the U.S. Underwriters and
    the International Managers have the option to purchase solely to cover
    over-allotments, if any.
(2) Estimated solely for purposes of calculating the registration fee, in
    accordance with Rule 457(c) under the Securities Act of 1933, as amended.
    Pursuant to Rule 457(c), the maximum aggregate offering price is based
    upon the average of the high and low prices of the Common Stock on
    December 1, 1997, as reported by the New York Stock Exchange.
 
                                ---------------
  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>
 
                               EXPLANATORY NOTE
 
  This Registration Statement contains a Prospectus relating to a public
offering in the United States and Canada (the "U.S. Offering") of an aggregate
of 11,200,000 shares of common stock (the "Common Stock") of Boston
Properties, Inc., a Delaware corporation, together with separate Prospectus
pages relating to a concurrent offering outside the United States and Canada
of an aggregate of 2,800,000 shares of Common Stock (the "International
Offering"). The complete Prospectus for the U.S. Offering follows immediately.
After such Prospectus are the following alternate pages for the International
Offering: a front cover page; an "Underwriting" section; and a back cover
page. All other pages of the Prospectus for the U.S. Offering are to be used
for both the U.S. Offering and the International Offering.
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL NOR  +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                 SUBJECT TO COMPLETION, DATED DECEMBER 3, 1997
 
PROSPECTUS
                               14,000,000 SHARES
                            BOSTON PROPERTIES, INC.
                                                                            LOGO
                                  COMMON STOCK
                                  ----------
 
  Boston Properties, Inc. is one of the largest owners and developers of office
properties in the United States, with a significant presence in Greater Boston,
Greater Washington, D.C. , midtown Manhattan and Baltimore, Maryland. Since the
Company's initial public offering in June 1997 (the "Initial Offering"), the
Company has acquired three office properties; entered into a contract to
acquire a fourth office property expected to close in January 1998; and is
currently developing six properties, consisting of five office properties and
one 221 room hotel. The aggregate anticipated investment since the Initial
Offering for these acquisitions and developments is $969.6 million. The Company
owns 83 properties (including the six properties under development and the
office property under contract) aggregating approximately 16.4 million square
feet. In addition, the Company owns or has options to acquire six parcels of
land that will support approximately 629,000 square feet of development.
 
  The Company was formed to succeed to the real estate development,
redevelopment, acquisition, management, operating and leasing businesses
associated with the predecessor company founded by Mortimer B. Zuckerman and
Edward H. Linde in 1970. Upon completion of this Offering the Company's
management and Board of Directors will own a 24.6% economic interest in the
Company, equal to approximately $570.5 million as of December 1, 1997. The
Company is a fully integrated, self-administered and self-managed real estate
company and expects to qualify as a real estate investment trust ("REIT") for
federal income tax purposes for the year ending December 31, 1997.
 
  All of the shares of the Common Stock offered hereby are being sold by the
Company. Of the 14,000,000 shares of Common Stock being offered hereby,
11,200,000 shares are being offered initially in the United States and Canada
by the U.S. Underwriters and 2,800,000 shares are being offered initially
outside the United States and Canada by the International Managers. See
"Underwriting."
 
  The Common Stock is listed on the New York Stock Exchange (the "NYSE") under
the symbol "BXP." On December 1, 1997, the reported last sale price of the
Common Stock on the NYSE was $33.25 per share.
 
  SEE "RISK FACTORS" BEGINNING ON PAGE 12 FOR CERTAIN FACTORS RELEVANT TO AN
INVESTMENT IN THE COMMON STOCK, INCLUDING:
 . The Company intends to acquire portfolios and individual properties; such
   acquisitions may not achieve intended returns;
 . The Company intends to develop commercial properties and its return on such
   investments can be lower than anticipated because properties can cost more
   to develop, take longer to develop or lease, or lease for lower rent than
   anticipated;
 . Conflicts of interest exist between the Company and Messrs. Zuckerman and
   Linde in connection with the Company's operations, including with respect
   to certain restrictions on the Company's ability to sell or transfer four
   properties until June 23, 2007 without the consent of Messrs. Zuckerman and
   Linde;
 . The Company relies on key personnel whose continued service is not
   guaranteed, including Messrs. Zuckerman and Linde;
 . Real estate investment and property management are risky as rents can
   fluctuate and operating costs can increase; and
 . The Company may not be able to refinance indebtedness on favorable terms,
   and interest rates might increase on amounts drawn under the Company's line
   of credit.
                                  ----------
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  PROSPECTUS.  ANY  REPRESENTATION  TO  THE
   CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                       PRICE TO UNDERWRITING PROCEEDS TO
                                        PUBLIC  DISCOUNT(1)  COMPANY(2)
- ------------------------------------------------------------------------
<S>                                    <C>      <C>          <C>
Per Share.............................   $          $            $
- ------------------------------------------------------------------------
Total(3)..............................  $          $            $
</TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
(1) The Company has agreed to indemnify the several Underwriters against
    certain liabilities, including liabilities under the Securities Act of
    1933, as amended. See "Underwriting."
(2) Before deducting estimated expenses of $     payable by the Company.
(3) The Company has granted the U.S. Underwriters a 30-day option to purchase
    up to an additional 1,680,000 shares of Common Stock, and has granted the
    International Managers a 30-day option to purchase up to an additional
    420,000 shares of Common Stock, on the same terms and conditions as set
    forth above solely to cover overallotments, if any. If such options are
    exercised in full, the total Price to Public, Underwriting Discount and
    Proceeds to Company will be $    , $     and $    , respectively. See
    "Underwriting."
                                  ----------
  The shares of Common Stock are offered by the several Underwriters, subject
to prior sale, when, as and if issued and accepted by them, subject to approval
of certain legal maters by counsel for the Underwriters. The Underwriters
reserve the right to withdraw, cancel or modify such offer and to reject orders
in whole or in part. It is expected that delivery of the shares will be made in
New York, New York on or about     , 1998.
                                  ----------
                   Joint Lead Managers and Joint Bookrunners
GOLDMAN, SACHS & CO._________________________________________MERRILL LYNCH & CO.
                                  ----------
BEAR, STEARNS & CO. INC.
     MORGAN STANLEY DEAN WITTER
            PAINEWEBBER INCORPORATED
                  PRUDENTIAL SECURITIES INCORPORATED
                        SALOMON SMITH BARNEY
                              CHASE SECURITIES INC.
                                  ----------
                 The date of this Prospectus is         , 1998.
<PAGE>
                                   [Art Work]
 
            [MAP(S) SHOWING LOCATION OF THE COMPANY'S PROPERTIES] 
 
 
 
CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS THAT
STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK. SUCH
TRANSACTIONS MAY INCLUDE STABILIZING THE PURCHASE OF COMMON STOCK TO COVER
SYNDICATE SHORT POSITIONS AND THE IMPOSITION OF PENALTY BIDS. FOR A DESCRIPTION
OF THESE ACTIVITIES, SEE "UNDERWRITING."
<PAGE>

                                  [ART WORK]

 Properties Acquired or Developed Since the Company's Initial Public Offering
                                   

[Picture of 280 Park Avenue, New York, NY]             [Picture of 875 Third 
                                                        Avenue, New York, 
                                                        New York]
                                                        




                                                       [Picture of 100 East 
                                                        Pratt Street, Baltimore,
                                                        Maryland]
                                                         
                                                         


                                                                               
                                                      [Picture of Sugarland  
                                                       Building Two, Herndon,
[Picture of                                            Virginia]
 Riverfront Plaza, Richmond, Virginia]                 
                        

          Not illustrated: Sugarland Building One, Herndon, Virginia
              7700 Boston Boulevard, Building Twelve, Springfield
    Virginia, 7501 Boston Boulevard, Building Seven, Springfield, Virginia
<PAGE>
 
For a summary of property, property type, operating and ownership data regarding
the Properties see the "Summary Property Data" table contained herein.
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
PROSPECTUS SUMMARY........................................................   1
 The Company..............................................................   1
 Risk Factors.............................................................   6
 Business and Growth Strategies...........................................   6
 The Properties...........................................................   7
 The Offering.............................................................   9
 Distributions............................................................   9
 Tax Status of the Company................................................   9
SUMMARY SELECTED FINANCIAL INFORMATION....................................  10
RISK FACTORS..............................................................  12
 The Company May Not Achieve Expected Returns on Property Acquisitions....  12
 The Company's Investments in Property Development May Not Yield Expected
  Returns.................................................................  12
 Conflicts of Interest Exist Between the Company and Messrs. Zuckerman
  and Linde in Connection with the Operation of the Company...............  12
   For a period of time, sales of properties and repayment of indebtedness
    will have different effects on holders of OP Units than on
    stockholders..........................................................  12
   Messrs. Zuckerman and Linde will continue to engage in other
    activities............................................................  13
 The Company Relies on Key Personnel Whose Continued Service is Not
  Guaranteed..............................................................  13
 The Company's Performance and Value Are Subject to Risks Associated with
  the Real Estate Industry................................................  13
   Lease expirations could adversely affect the Company's cash flow.......  13
   Hotel operating risks could adversely affect the Company's cash flow...  13
   Acquisition risks could adversely affect the Company...................  14
   Uncontrollable factors affecting the Properties' performance and value
    could produce lower returns...........................................  14
   Illiquidity of real estate investments could adversely affect the
    Company's financial condition.........................................  14
   Liability for environmental matters could adversely affect the
    Company's financial condition.........................................  14
   The cost of complying with the Americans with Disabilities Act could
    adversely affect the Company's cash flow..............................  15
   Uninsured losses could adversely affect the Company's cash flow........  15
   Changes in tax and environmental laws could adversely affect the
    Company's financial condition.........................................  16
 The Company's Use of Debt to Finance Acquisitions and Developments Could
  Adversely Affect the Company............................................  16
   The required repayment of debt or of interest thereon can adversely
    affect the Company....................................................  16
</TABLE>
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
   The Company's policy of no limitation on debt could adversely affect
    the Company's cash flow...............................................  16
 Failure to Qualify as a REIT Would Cause the Company to be Taxed as a
  Corporation.............................................................  16
   The Company will be taxed as a corporation if it fails to qualify as a
    REIT..................................................................  16
   To qualify as a REIT the Company will need to maintain a certain level
    of distributions......................................................  17
   Other Tax Liabilities..................................................  17
 The Ability of Stockholders to Control the Policies of the Company and
  Effect a Change of Control of the Company is Limited....................  17
   Stockholder approval is not required to change policies of the
    Company...............................................................  17
   Stockholder approval is not required to engage in investment activity..  17
   Stock ownership limit in the Certificate could inhibit changes in
    control...............................................................  18
   Provisions in the Certificate and Bylaws and in the Operating
    Partnership Agreement could prevent acquisitions and changes in
    control...............................................................  18
   Shareholder Rights Agreement could inhibit changes in control..........  19
   Certain provisions of Delaware law could inhibit acquisitions and
    changes in control....................................................  19
   Provisions of debt instruments.........................................  19
 Interest Rates, Equity Market Conditions, and Shares Available for
  Future Sale Could Adversely Impact the Trading Price of the Common
  Stock...................................................................  19
   Interest rates and trading levels of equity markets could change.......  19
   Availability of shares for future sale could adversely affect the
    market price..........................................................  20
 The Company Has Had Historical Accounting Losses and Has a Deficit in
  Owners' Equity; the Company May Experience Future Losses................  20
THE COMPANY...............................................................  21
 General..................................................................  21
 History..................................................................  23
 Recent Events............................................................  24
BUSINESS AND GROWTH STRATEGIES............................................  27
USE OF PROCEEDS...........................................................  31
PRICE RANGE OF SHARES AND DISTRIBUTION HISTORY............................  32
CAPITALIZATION............................................................  33
SELECTED FINANCIAL INFORMATION............................................  34
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
 OF OPERATIONS............................................................  37
 Results of Operations....................................................  37
 Pro Forma Operating Results..............................................  39
 Liquidity and Capital Resources..........................................  40
 Cash Flows...............................................................  42
 Inflation................................................................  43
BUSINESS AND PROPERTIES...................................................  44
 General..................................................................  44
</TABLE>
 
                                       i
<PAGE>
 
<TABLE>
<CAPTION>
                                                                             PAGE
                                                                             ----
<S>                                                                          <C>
 Summary Property Data.....................................................   45
 Location of Properties....................................................   47
 Tenants...................................................................   48
 The Office Properties.....................................................   55
 The Hotel Properties......................................................   69
 The Development Properties................................................   71
 Development Consulting and Third-Party Property Management................   71
 Partial Interests.........................................................   71
 Environmental Matters.....................................................   71
THE UNSECURED LINE OF CREDIT..........                                        73
MANAGEMENT.................................................................   74
 Directors and Executive Officers..........................................   74
 Committees of the Board of Directors......................................   77
 Compensation of Directors.................................................   77
 Executive Compensation....................................................   78
 Employment and Noncompetition Agreements..................................   79
 Compensation Committee Interlocks and Insider Participation...............   80
 Stock Option Plan.........................................................   80
 Limitation of Liability and Indemnification...............................   82
 Indemnification Agreements................................................   83
CERTAIN TRANSACTIONS.......................................................   83
POLICIES WITH RESPECT TO CERTAIN ACTIVITIES................................   84
 Investment Policies.......................................................   84
 Dispositions..............................................................   85
 Financing Policies........................................................   85
 Conflict of Interest Policies.............................................   85
 Personal Property.........................................................   86
 Policies with Respect to Other Activities.................................   87
STRUCTURE AND FORMATION OF THE COMPANY.....................................   87
 Formation Transactions....................................................   87
 Structure of the Company..................................................   89
 Benefits to Related Parties...............................................   90
OPERATING PARTNERSHIP AGREEMENT............................................   91
 Management................................................................   91
 Removal of the General Partner; Transfer of the General Partner's
  Interest.................................................................   91
 Amendments of the Operating Partnership Agreement.........................   91
 Transfer of OP Units; Substitute Limited Partners.........................   92
 Redemption of OP Units....................................................   92
 Issuance of Additional Limited Partnership Interests......................   92
</TABLE>
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
 Extraordinary Transactions...............................................   93
 Tax Protection Provisions................................................   93
 Exculpation and Indemnification of the General Partner...................   94
 Tax Matters..............................................................   94
 Term.....................................................................   94
PRINCIPAL STOCKHOLDERS....................................................   95
DESCRIPTION OF CAPITAL STOCK..............................................   96
 General..................................................................   96
 Common Stock.............................................................   96
 Preferred Stock..........................................................   96
 Restrictions on Transfers................................................   97
 Shareholder Rights Agreement.............................................   98
CERTAIN PROVISIONS OF DELAWARE LAW AND THE COMPANY'S CERTIFICATE AND
 BYLAWS...................................................................  101
 Amendment of Certificate and Bylaws......................................  101
 Dissolution of the Company...............................................  101
 Meetings of Stockholders.................................................  101
 The Board of Directors...................................................  101
 Shareholder Rights Plan and Ownership Limitations........................  102
 Limitation of Liability and Indemnification..............................  102
 Business Combinations....................................................  103
 Indemnification Agreements...............................................  103
SHARES AVAILABLE FOR FUTURE SALE..........................................  104
 General..................................................................  104
 Registration Rights......................................................  104
FEDERAL INCOME TAX CONSEQUENCES...........................................  105
 Federal Income Taxation of the Company...................................  105
 Opinion of Tax Counsel...................................................  105
 Requirements for Qualification...........................................  106
 Failure to Qualify.......................................................  112
 Taxation of U.S. Stockholders............................................  112
 Special Tax Considerations for Foreign Stockholders......................  114
 Information Reporting Requirements and Backup Withholding Tax............  115
 Other Tax Considerations.................................................  116
 State and Local Tax......................................................  117
UNDERWRITING..............................................................  118
EXPERTS...................................................................  120
LEGAL MATTERS.............................................................  120
ADDITIONAL INFORMATION....................................................  121
GLOSSARY..................................................................  122
INDEX TO FINANCIAL STATEMENTS.............................................  F-1
</TABLE>
 
                                       ii
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  This summary is qualified in its entirety by the more detailed information
included elsewhere in this Prospectus. Boston Properties Limited Partnership, a
Delaware limited partnership of which Boston Properties, Inc. is the sole
general partner, is referred to as the "Operating Partnership." Unless
otherwise indicated, the information contained in this Prospectus assumes that
(i) the Underwriters' overallotment option is not exercised, (ii) that the
market price per share of Common Stock is equal to $33.25 (the reported closing
sale price of the Common Stock on the NYSE on December 1, 1997), and (iii) none
of the units of limited partnership of the Operating Partnership ("OP Units"),
which are redeemable for cash or, at the election of the Company, exchangeable
for Common Stock, are so redeemed or exchanged. All references in this
Prospectus to the "Company" refer to Boston Properties, Inc. and its
subsidiaries, including the Operating Partnership, collectively, unless the
context otherwise requires. The Company's initial public offering of Common
Stock (the "Initial Offering") closed on June 23, 1997. All references in this
Prospectus to the historical activities of the Company prior to the Initial
Offering refer to the activities of the Boston Properties Predecessor Group.
See "Glossary" for the definitions of certain terms used in this Prospectus.
 
                                  THE COMPANY
 
GENERAL
 
  Boston Properties, Inc. is one of the largest owners and developers of office
properties in the United States, with a significant presence in six submarkets
in Greater Boston, five submarkets in Greater Washington, D.C., two submarkets
in midtown Manhattan, and the downtown submarket of Baltimore, Maryland. The
Company owns 83 properties ("Properties"), including six properties under
development and one property expected to be acquired in January 1998. The
Properties aggregate approximately 16.4 million square feet.
 
   Since the Company's initial public offering in June 1997 (the "Initial
Offering"), the Company has acquired three office properties; entered into a
contract to acquire a fourth office property expected to close in January 1998;
and is currently developing six properties, consisting of five office
properties aggregating approximately 1.0 million net rentable square feet and
one 221 room hotel. The total anticipated investment for the four acquisition
properties is approximately $872.4 million and the total anticipated investment
for the six development properties is approximately $101.1 million (of which
$3.9 million was incurred prior to the Initial Offering). In addition, the
Company has delivered five office properties that were under development at the
time of the Initial Offering, for a total anticipated investment of
approximately $50.8 million (of which $28.8 million was incurred prior to the
Initial Offering). The Company will use a portion of the proceeds of this
Offering to purchase the 900,000 net rentable square foot Class A office
building in Richmond, Virginia that is currently under contract and expected to
close in January 1998, fund ongoing development and repay outstanding balances
under the Company's unsecured line of credit. As of December 1, 1997 the
Company had $233.0 million outstanding under its unsecured line of credit,
which amounts had been incurred primarily to support the Company's acquisition
and development activity.
 
  The Company was formed to succeed to the real estate development,
redevelopment, acquisition, management, operating and leasing businesses
associated with the predecessor company founded by Mortimer B. Zuckerman and
Edward H. Linde in 1970. The Company expects to qualify as a REIT for federal
income tax purposes for the year ending December 31, 1997. Following the
Offering, Messrs. Zuckerman and Linde will beneficially own in the aggregate a
22.9% economic interest in the Company and the other senior officers of the
Company will beneficially own in the aggregate a 1.7% economic interest in the
Company (in each case assuming the exchange of all OP Units for Common Stock).
 
  The Company's portfolio consists of 83 Properties, including the one office
property expected to be acquired in January 1998 ("Riverfront Plaza") and six
properties currently under development ("Development Properties"). The
Properties consist of 70 office properties ("Office Properties"), including 43
Class A office buildings ("Class A Office Buildings") and 27 properties that
support both office and technical uses ("R&D Properties"); nine industrial
properties ("Industrial Properties"); three hotels ("Hotel Properties"); and
one parking garage (the "Garage Property"). Five of the Office Properties are
currently under development by the Company and are referred to as the "Office
Development Properties." One Hotel Property is currently under development and
is referred to as the "Hotel Development Property." The Company considers Class
A office buildings to be buildings that are centrally located, professionally
managed and maintained, attract high-quality tenants and command upper-tier
rental rates, and are modern structures or have been modernized to compete with
newer buildings.
 
  Over its 27 year history, the Company has developed 83 properties totaling
15.3 million square feet, including properties developed for third parties and
the six properties currently under development. The Company's current portfolio
of 83 properties includes 60 of these Company-developed properties.
 
                                       1
<PAGE>
 
 
  The following chart shows the geographic location of the Company's Office and
Industrial Properties (including the five Office Properties currently under
development and the Office Property under contract that is expected to close in
January 1998) by net rentable square feet and Annualized Rent on a pro forma
basis as of September 30, 1997:
 
<TABLE>
<CAPTION>
                              NET RENTABLE SQUARE FEET OF
                           OFFICE AND INDUSTRIAL PROPERTIES
                  ------------------------------------------------------
                   CLASS A                                       PERCENT
                    OFFICE       R&D      INDUSTRIAL               OF
     MARKET       BUILDINGS   PROPERTIES  PROPERTIES   TOTAL      TOTAL
     ------       ---------   ----------  ----------   -----     -------
<S>               <C>         <C>         <C>        <C>         <C>
GREATER BOSTON..   2,281,457    545,206    247,318    3,073,981    24.2%
GREATER
 WASHINGTON,
 D.C............   3,490,143    903,358    236,743    4,630,244    36.4
BALTIMORE, MD...     633,482        --         --       633,482     5.0
RICHMOND, VA
 (PENDING)......     899,720        --         --       899,720     7.1
MIDTOWN
 MANHATTAN......   2,880,508        --         --     2,880,508    22.7
GREATER SAN
 FRANCISCO......         --     144,479    281,000      425,479     3.3
BUCKS COUNTY,
 PA.............         --         --     161,000      161,000     1.3
                  ----------  ---------    -------   ----------   -----
TOTAL...........  10,185,310  1,593,043    926,061   12,704,414   100.0%
                  ==========  =========    =======   ==========   =====
PERCENT OF
 TOTAL..........        80.2%      12.5%       7.3%       100.0%
NUMBER OF
 PROPERTIES.....          43         27          9           79
<CAPTION>
                               ANNUALIZED RENT OF OFFICE AND
                                 INDUSTRIAL PROPERTIES (1)
                  ------------------------------------------------------------
                    CLASS A                                            PERCENT
                     OFFICE         R&D      INDUSTRIAL                  OF
     MARKET        BUILDINGS    PROPERTIES   PROPERTIES     TOTAL       TOTAL
     ------       ------------- ----------   ----------     -----      -------
<S>               <C>           <C>          <C>         <C>           <C>
GREATER BOSTON..  $ 43,760,880  $ 6,022,906  $1,649,144  $ 51,432,930    17.1%
GREATER
 WASHINGTON,
 D.C............    82,911,302    7,743,200   1,524,927    92,179,429    30.6
BALTIMORE, MD...    15,224,424          --          --     15,224,424     5.0
RICHMOND, VA
 (PENDING)......    17,563,259          --          --     17,563,259     5.8
MIDTOWN
 MANHATTAN......   122,178,265          --          --    122,178,265    40.5
GREATER SAN
 FRANCISCO......           --     1,061,181   1,029,027     2,090,208     0.7
BUCKS COUNTY,
 PA.............           --           --      868,699       868,699     0.3
                  ------------- ------------ ----------- ------------- -------
TOTAL...........  $281,638,130  $14,827,287  $5,071,797  $301,537,214   100.0%
                  ============= ============ =========== ============= =======
PERCENT OF
 TOTAL..........          93.4%         4.9%        1.7%        100.0%
NUMBER OF
 PROPERTIES.....            43           27           9            79
</TABLE>
- -------
(1) Annualized Rent is the monthly contractual rent under existing leases as of
    September 30, 1997 multiplied by twelve. 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 were, on an annualized basis, approximately $12.9
    million.
 
  The table above excludes (i) the Company's three Hotel Properties totaling
937,874 square feet (representing approximately $21.1 million of annualized
seasonally adjusted triple net rent based on the quarter ended September 30,
1997) and (ii) the Company's Garage Property and structured parking related to
the Company's Office Properties totaling 2,795,972 square feet (representing
approximately $1.5 million of annualized triple net rent based on the quarter
ended September 30, 1997).
 
  The Company believes that the Properties are well positioned to provide a
base for continued growth. The Properties are leased to high quality tenants
and, in general, located in submarkets with low vacancy rates and rising rents
and room rates. With the value added by the Company's in-house marketing,
leasing, construction of tenant improvements and property management programs,
the Company has historically achieved high occupancy rates and efficient re-
leasing of vacated space.
 
  As of September 30, 1997, the Office Properties (excluding the Office
Development Properties) and the Industrial Properties had an occupancy rate of
96% and the Hotel Properties (excluding the Hotel Development Property) had an
average occupancy rate for the nine months ended September 30, 1997 of 88%.
Leases with respect to 2.5% of the leased square footage of the Office and
Industrial Properties expire in the fourth quarter of 1997, and 8.0% and 6.8%
expire in calendar years 1998 and 1999, respectively.
 
  The Company has a $300 million unsecured revolving line of credit (the
"Unsecured Line of Credit") with BankBoston, N.A., as agent ("BankBoston") that
expires in June 2000. The Company uses the Unsecured Line of Credit principally
to facilitate its development and acquisition activities and for working
capital purposes and, as of December 1, 1997, had $233.0 million outstanding
thereunder. See "Unsecured Line of Credit." As of December 1, 1997, the Company
had a debt to total market capitalization ratio of approximately 41.8%. At the
completion of this Offering and upon the application of the net proceeds
therefrom, the Company expects to have a debt to total market capitalization
ratio of approximately 34.4%. The Company does not have a specific policy
limiting the amount of leverage that it expects to use as a whole or with
respect to individual properties.
 
  The Company is a full-service real estate company, with substantial in-house
expertise and resources in acquisitions, development, financing, construction
management, property management, marketing, leasing, accounting, tax and legal
services. As of September 30, 1997, the Company had 312 employees, including 94
professionals. The Company's 16 senior officers, together with Mr. Zuckerman,
Chairman of the Board, have an average of 24 years experience in the real
estate industry and an average of 16 years tenure with the Company. The
Company's headquarters are located at 8 Arlington Street, Boston, Massachusetts
02116 and its telephone number is (617) 859-2600. In addition, the Company has
regional offices at the U.S. International Trade Commission Building at 500 E
Street, SW, Washington, D.C. 20024 and at 599 Lexington Avenue, New York, New
York 10002.
 
 
                                       2
<PAGE>
 
RECENT EVENTS
 
  Since the Company's Initial Offering in June 1997, the Company has acquired
three Class A Office Buildings, entered into a contract to acquire a fourth
Class A Office Building expected to close in January 1998, and is developing
five Class A Office Buildings and one 221 room hotel for a total anticipated
investment of approximately $969.6 million. The following describes the four
acquisition properties:
 
                              RECENT ACQUISITIONS
 
<TABLE>
<CAPTION>
                            DATE       NET                                                      ANNUALIZED
                          ACQUIRED/ RENTABLE               ANTICIPATED                           RENT PER
                            TO BE    SQUARE     INITIAL      FUTURE       TOTAL      CURRENT  LEASED SQ. FT.
        PROPERTY          ACQUIRED    FEET     INVESTMENT  INVESTMENT   INVESTMENT  OCCUPANCY AT 9/30/97(/1/)
        --------          --------- --------- ------------ ----------- ------------ --------- ---------------
<S>                       <C>       <C>       <C>          <C>         <C>          <C>       <C>
280 Park Avenue, New
 York, NY...............     9/97   1,198,769 $322,650,000 $28,986,652 $351,636,652     88%       $41.95
100 East Pratt Street,
 Baltimore, MD..........    10/97     633,482  137,516,000         --   137,516,000     97         24.53
875 Third Avenue, New
 York, NY...............    11/97     681,669  206,500,000   2,400,000  208,900,000    100         42.37
Riverfront Plaza,
 Richmond, VA...........     1/98     899,720  174,361,000         --   174,361,000     97         20.16
                                    --------- ------------ ----------- ------------    ---        ------
TOTAL/WEIGHTED AVERAGE..            3,413,640 $841,027,000 $31,386,652 $872,413,652     94%       $33.06
                                    ========= ============ =========== ============    ===        ======
</TABLE>
- -------
(1) At September 30, 1997 total rent abatements with respect to these
    properties, on an annualized basis, were equal to $2.63 per leased square
    foot.
 
  The total acquisition price for these four Properties is approximately $841.0
million, consisting of $294.0 million in cash (including amounts funded by
borrowings under the Unsecured Line of Credit), $522.0 million in secured debt
(of which $180.0 million is assumed debt), and 890,869 OP Units (valued at $28
1/16 per OP Unit and subject to certain post-closing adjustments).
 
  280 Park Avenue. This Class A Office Building is located in the Park Avenue
submarket of midtown Manhattan. According to Insignia/Edward S. Gordon Co.,
Inc. ("Insignia/ESG"), at September 30, 1997, this submarket had an
availability rate of 7.6% and an average asking rent of $46.31 per square foot.
The Company anticipates investing approximately $29.0 million in tenant
improvements, leasing commissions and building system improvements. The
Property consists of two linked towers of 30 stories and 42 stories. Principal
tenants at this Property include Bankers Trust Company, Furman Selz LLC and the
National Football League.
 
  100 East Pratt Street. This Class A Office Building is located in downtown
Baltimore, Maryland. According to Colliers Pinkard, at June 30, 1997, the first
tier of the downtown Baltimore Class A office market (which includes this
Property) had an availability rate of 8.6% and average asking rents of $24.83
per square foot. The largest tenant at this Property is T. Rowe Price.
 
  875 Third Avenue. This Class A Office Building is located in the East Side
submarket of midtown Manhattan on Third Avenue between 52nd and 53rd Streets.
According to Insignia/ESG, at September 30, 1997, the East Side submarket had
an availability rate of 12.6% and an average asking rent of $36.95 per square
foot. Principal tenants at this Property include Debevoise & Plimpton and
Instinet Corporation.
 
  Riverfront Plaza. The Company has entered into a purchase and sale agreement
to acquire this Class A Office Building in Richmond, Virginia. According to
Harrison & Bates, at September 30, 1997, the Richmond Class A office market had
an availability rate of 5.0% and an average asking rent of $20.84 per square
foot. Primary tenants at this Property include Hunton & Williams and Wheat
First Butcher Singer, Inc. While the Company anticipates closing on this
acquisition in January 1998, there can be no assurances that the Company will
acquire this property in January 1998, or at all.
 
  The Company regularly pursues the acquisition of income producing properties
and sites for development and may from time to time enter into letters of
intent, contribution agreements and purchase and sale agreements with respect
to the same. In addition to the contract to acquire Riverfront Plaza, the
Company is currently a party to three purchase and sale or contribution
agreements with respect to properties and sites located in Greater Washington,
D.C. and Greater Boston. One such agreement relates to the contribution to the
Operating Partnership of a series of related properties with approximately 1.3
million net rentable square feet of office space and sites that support 920,000
net rentable square feet of development. The Company is conducting its due
diligence review under all three agreements and currently has the right to
terminate each agreement without payment of a termination fee to the seller.
There can be no assurance that any such acquisition will be consummated.
 
                                       3
<PAGE>
 
 
  Since the Company's Initial Offering, the Company has completed the
development or redevelopment of the following Properties for its own account:
 
          DEVELOPMENT PROPERTIES DELIVERED SINCE THE INITIAL OFFERING
 
<TABLE>
<CAPTION>
                           DATE                               NET
                          PLACED                            RENTABLE ANTICIPATED
                            IN                     NO. OF    SQUARE     TOTAL     CURRENT
        PROPERTY          SERVICE    LOCATION     BUILDINGS   FEET   INVESTMENT+ OCCUPANCY
        --------          ------- --------------- --------- -------- ----------- ---------
<S>                       <C>     <C>             <C>       <C>      <C>         <C>
Sugarland Building One..    6/97      Herndon, VA      1     52,797  $ 5,962,348     82%
Sugarland Building Two..    6/97      Herndon, VA      1     59,423    5,256,692     46
7700 Boston Boulevard,
 Building Twelve........   10/97  Springfield, VA      1     82,224   10,427,128    100
7501 Boston Boulevard,
 Building Seven.........   11/97  Springfield, VA      1     75,756   11,469,620    100
201 Spring Street.......   11/97    Lexington, MA      1    102,000   17,689,442    100
                                                     ---    -------  -----------    ---
TOTAL/WEIGHTED AVERAGE..                               5    372,200  $50,805,230     89%
                                                     ===    =======  ===========    ===
</TABLE>
- -------
+ As of November 30, 1997, the Company had invested $45.2 million, of which
  $28.8 million was invested at or prior to the completion of the Initial
  Offering.
 
  Sugarland Buildings One and Two. These single story office/flex buildings on
extensively landscaped sites are located in the Sugarland Office Complex in
Herndon, Virginia. The Company purchased the buildings vacant in 1996 and
completed improvements to them in June 1997. As of December 1, 1997
approximately 70% of the total of 112,220 net rentable square feet of these
buildings was committed under signed leases or letters of intent with leases in
negotiation.
 
  7700 Boston Boulevard, Building Twelve and 7501 Boston Boulevard, Building
Seven. These R&D Properties are located on land owned by the Company in its
Virginia-95 Office Park and are currently 100% leased to Autometric, Inc. and
the General Services Administration for terms of 15 and 10 years, respectively.
 
  201 Spring Street. This Class A Office Building is located in the Route 128
Northwest submarket of Greater Boston and is adjacent to the Company's existing
Class A Office Building at 191 Spring Street. The building is currently 100%
leased to MediaOne of Delaware, Inc. ("MediaOne"), formerly Continental
Cablevision, Inc. MediaOne has notified the Company that it intends to relocate
its headquarters to another state and sublease this building.
 
  The Company is currently developing the following Properties for its own
account:
 
                     PROPERTIES CURRENTLY UNDER DEVELOPMENT
 
<TABLE>
<CAPTION>
                                                                 NET
                                                              RENTABLE  ANTICIPATED
                          ANTICIPATED                NO. OF    SQUARE      TOTAL
 DEVELOPMENT PROPERTIES   COMPLETION    LOCATION    BUILDINGS   FEET    INVESTMENT+
 ----------------------   ----------- ------------- --------- --------- ------------
<S>                       <C>         <C>           <C>       <C>       <C>
Class A Office Buildings
 Reston Overlook (25%
  ownership)............    Q1 1999      Reston, VA      2      440,000  $18,100,000(/1/)
 Eight Cambridge Cen-
  ter...................    Q2 1999   Cambridge, MA      1      134,054   21,000,000
 181 Spring Street......    Q2 1999   Lexington, MA      1       52,000   10,871,085
 One Freedom Square (25%
  ownership)............    Q4 1999      Reston, VA      1      406,980   19,150,000(/1/)
                                                       ---    --------- ------------
 Total Class A Office
  Buildings.............                                 5    1,033,034 $ 69,121,085
Hotel
 Residence Inn by
  Marriott(R)...........    Q1 1999   Cambridge, MA      1      187,474  $32,000,000
                                                       ---    --------- ------------
TOTAL DEVELOPMENT PROP-
 ERTIES.................                                 6    1,220,508 $101,121,085
                                                       ===    ========= ============
</TABLE>
- -------
+ As of November 30, 1997, the Company had invested $6.9 million, of which $3.9
  million was invested at or prior to the completion of the Initial Offering.
(1) Represents 25% of the total anticipated project-level investment.
 
                                       4
<PAGE>
 
 
  One and Two Reston Overlook. One Reston Overlook is an approximately 312,000
square foot, 12-story, Class A Office Building located in Reston, Virginia. The
Company is developing this property through its joint venture with Westbrook
Partners ("Westbrook"). Completion of One Reston Overlook is scheduled for
February 1999. Approximately 309,000 square feet of development is pre-leased
to BDM International ("BDM") for a term of twelve years (the building's
remaining 3,000 square feet are ground-floor retail space). The Company is also
constructing Two Reston Overlook, a six-story building on the site totaling
approximately 128,000 square feet. Two Reston Overlook is being developed
without a pre-leasing commitment in response to the significant unsatisfied
demand for office space in the Reston, Virginia market. Delivery of Two Reston
Overlook is scheduled for December 1998.
 
  Eight Cambridge Center. This seven-story Class A Office Building is located
in the Cambridge Center development in East Cambridge, Massachusetts.
Completion of this Class A Office Building is scheduled for April 1999.
 
  181 Spring Street. This Class A Office Building is adjacent to the Company's
201 Spring Street Property in the Route 128 Northwest submarket of Greater
Boston. This property is being developed without a pre-leasing commitment in
response to the significant unsatisfied demand for office space in the Route
128 Northwest submarket. Completion of 181 Spring Street is scheduled for May
1999.
 
  One Freedom Square. This Class A Office Building is currently being developed
by the Company in Reston, Virginia. This building is 59.0% pre-committed to
Andersen Consulting. Completion of the building is scheduled for the fourth
quarter of 1999.
 
  Residence Inn by Marriott(R). The Company is currently developing this 221-
room limited service extended stay hotel on land owned by the Company in the
Company's Cambridge Center development. The hotel will be managed by the
Residence Inn division of Marriott International, Inc. and is scheduled to open
in January 1999. As with the Company's other Hotel Properties, the Company will
lease this hotel and will have a participation in the gross receipts of the
hotel.
 
                                       5
<PAGE>
 
 
                                  RISK FACTORS
 
  An investment in the Common Stock involves various risks, and prospective
investors should carefully consider the matters discussed under "Risk Factors"
prior to an investment in the Company. Such risks include, among others:
 
  . the Company may acquire large properties or portfolios of properties that
    would substantially increase the size of the Company, and the Company's
    ability to assimilate such acquisitions and achieve the intended return on
    investment cannot be assured;
 
  . the development of commercial properties is subject to risks such as the
    availability and timely receipt of regulatory approvals, the cost and
    timely completion of construction, the availability of construction
    financing on favorable terms, the timely leasing of the property, and the
    leasing of the property at lower rental rates than anticipated, any of
    which could have an adverse effect on the financial condition of the
    Company;
 
  . conflicts of interest between the Company and Messrs. Zuckerman and Linde,
    including conflicts associated with the sale of any of the Properties or
    with the repayment of indebtedness because of possible adverse tax
    consequences which may influence them to not act in the best interests of
    the stockholders; in particular the Company will, in general, be
    restricted from selling or transferring in a taxable transaction any of
    four Designated Properties until June 23, 2007 without the consent of
    Messrs. Zuckerman and Linde;
 
  . dependence on key personnel whose continued service is not guaranteed,
    particularly Messrs. Zuckerman and Linde;
 
  . real estate investment and property management risks such as the need to
    renew leases or relet space upon lease expirations and, at times, to pay
    renovation and reletting costs in connection therewith, the effect of
    economic 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 and debt service, all of
    which may adversely affect the Company's ability to make expected
    distributions to stockholders;
 
  . the possibility that the Company may not be able to refinance outstanding
    indebtedness upon maturity or acceleration, that such indebtedness might
    be refinanced at higher interest rates or otherwise on terms less
    favorable to the Company than existing indebtedness, and the lack of
    limitations in the Company's organizational documents on the amount of
    indebtedness the Company may incur;
 
  . taxation of the Company as a corporation if it fails to qualify as a REIT
    for federal income tax purposes, the Company's liability for certain
    federal, state and local income taxes in such event, and the resulting
    decrease in cash available for distribution; and
 
  . anti-takeover effect of limiting actual or constructive ownership of
    Common Stock of the Company by a single person other than Mr. Zuckerman
    and Mr. Linde (and certain associated parties) to 6.6% of the outstanding
    capital stock, subject to certain specified exceptions, and certain other
    provisions contained in the organizational documents of the Company and
    the Operating Partnership, and of a shareholder rights plan adopted by the
    Company, any of which may have the effect of delaying or preventing a
    transaction or change in control of the Company that might involve a
    premium price for the Common Stock or otherwise be in the best interests
    of the Company's stockholders.
 
                         BUSINESS AND GROWTH STRATEGIES
 
BUSINESS STRATEGY
 
  The Company's primary objective is to maximize growth in cash flow and total
return to stockholders. The Company's strategy to achieve this objective is:
(i) to selectively acquire and develop properties in the Company's existing
markets, adjacent markets and in new markets that present favorable
opportunities; (ii) to maintain high occupancy rates at rents that are at the
high end of the markets in which the Properties are located, and to continue to
achieve high room and occupancy rates in the Hotel Properties; and (iii) to
selectively provide comprehensive, project-level development and management
services to third parties. See "Business and Growth Strategies."
 
 
                                       6
<PAGE>
 
GROWTH STRATEGIES
 
 External Growth
 
  The Company will continue to pursue the following four areas of development
and acquisition activities, which the Company believes present significant
opportunities for external growth:
 
  .Acquire assets and portfolios of assets from institutions or individuals.
 
  .Acquire existing underperforming assets and portfolios of assets.
 
  .Pursue development and land acquisitions in selected submarkets.
 
  .Provide third-party development management services.
 
  When desirable, the Company will offer OP Units or Common Stock to sellers of
properties to finance an acquisition and enable a tax deferred contribution of
a property to the Company.
 
 Internal Growth
 
  The Company believes there are significant opportunities to increase cash
flow from many of its existing Properties because they are high quality
properties in desirable locations in submarkets that are experiencing rising
rents and room rates, low vacancy rates and increasing demand for office, R&D
and industrial space and for hotel accommodations.
 
  .Directly manage properties to maximize the potential for tenant retention.
 
  .Replace tenants quickly at best available market terms and lowest possible
  transaction costs.
 
                                 THE PROPERTIES
 
  The Company's portfolio consists of 83 Properties, including the Riverfront
Plaza Property expected to be acquired by the Company in January 1998 and six
Development Properties. The Properties consist of 70 Office Properties,
including 43 Class A Office Buildings and 27 R&D Properties; nine Industrial
Properties; three Hotel Properties; and the Garage Property.
 
  The two Hotel Properties are located in Boston and Cambridge, Massachusetts.
For the nine months ended September 30, 1997, the Hotel Properties had a
weighted average occupancy rate of 88.0%, a weighted average ADR of $194.58 and
a weighted average REVPAR of $172.32. Management believes that REVPAR (as
defined more fully in the Glossary) is an industry standard measure used to
present hotel operating data.
 
  To assist the Company in maintaining its status as a REIT, the Company leases
the Hotel Properties, pursuant to a lease with a participation in the gross
receipts of the Hotel Properties, to a lessee ("ZL Hotel LLC") in which Messrs.
Zuckerman and Linde are the sole member-managers. Messrs. Zuckerman and Linde
have a 9.8% economic interest in such lessee and one or more unaffiliated
public charities have a 90.2% economic interest. Marriott International, Inc.
manages the Hotel Properties under the Marriott (R) name pursuant to a
management agreement with the lessee. Under the REIT requirements, revenues
from a hotel are not considered to be rental income for purposes of certain
income tests which a REIT must meet. See "Federal Income Tax Consequences--
Requirements for Qualification." Accordingly, in order to maintain its
qualification as a REIT, the Company has entered into the participating leases
described above to provide revenue which qualifies as rental income under the
REIT requirements.
 
                                       7
<PAGE>
 
  The following chart shows the geographic location of the Company's Office
and Industrial Properties, including the Office Development Properties, by net
rentable square feet (excluding storage space) and Annualized Rent as of
September 30, 1997:
<TABLE>
<CAPTION>
                                          NET RENTABLE SQUARE FEET OF
                                       OFFICE AND INDUSTRIAL PROPERTIES
                              ------------------------------------------------------
                     NUMBER    CLASS A                                       PERCENT
                       OF       OFFICE       R&D      INDUSTRIAL               OF
 MARKET/SUBMARKET  PROPERTIES BUILDINGS   PROPERTIES  PROPERTIES   TOTAL      TOTAL
 ----------------  ---------- ---------   ----------  ----------   -----     -------
<S>                <C>        <C>         <C>         <C>        <C>         <C>
GREATER BOSTON
 East Cambridge
 (2) ............       6        689,203     67,362        --       756,565     6.0%
 Route 128 NW
 Bedford, MA.....       3         90,000    383,704        --       473,704     3.7
 Billerica, MA...       1            --      64,140        --        64,140     0.5
 Burlington, MA..       2        152,552        --         --       152,552     1.2
 Lexington, MA
 (3).............      11        842,957     30,000        --       872,957     6.9
 Route 128/MA
 Turnpike
 Waltham, MA.....       6        307,390        --         --       307,390     2.4
 Route 128 SW
 Westwood, MA....       2            --         --     247,318      247,318     2.0
 Route 128 South
 Quincy, MA......       1        168,829        --         --       168,829     1.3
 Boston..........       1         30,526        --         --        30,526     0.2
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........      33      2,281,457    545,206    247,318    3,073,981    24.2%
GREATER
WASHINGTON, D.C.
 SW Washington,
 D.C.(4).........       4      1,560,941        --         --     1,560,941    12.3%
 West End
 Washington,
 D.C. ...........       1        280,065        --         --       280,065     2.2
 Montgomery
 County, MD
 Bethesda, MD....       3        680,000        --         --       680,000     5.4
 Gaithersburg, MD
 (5).............       1        122,157        --         --       122,157     1.0
 Fairfax County,
 VA
 Herndon, VA.....       2            --     112,220        --       112,220     0.9
 Reston, VA (6)..       3        846,980        --         --       846,980     6.7
 Springfield, VA
 (4)(7)..........      11            --     791,138        --       791,138     6.2
 Prince George's
 County, MD
 Landover, MD....       3            --         --     236,743      236,743     1.9
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........      28      3,490,143    903,358    236,743    4,630,244    36.4%
BALTIMORE, MD           1        633,482        --         --       633,482     5.0%
RICHMOND, VA(8)         1        899,720        --         --       899,720     7.1%
MIDTOWN MANHATTAN
 Park Avenue.....       2      2,198,839        --         --     2,198,839    17.3%
 Eastside........       1        681,669        --         --       681,669     5.4
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........       3      2,880,508        --         --     2,880,508    22.7%
GREATER SAN
FRANCISCO
 Hayward, CA.....       1            --         --     221,000      221,000     1.7%
 San Francisco,
 CA (9)..........      11            --     144,479     60,000      204,479     1.6
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........      12            --     144,479    281,000      425,479     3.3%
BUCKS COUNTY,
PA...............       1            --         --     161,000      161,000     1.3%
                      ---     ----------  ---------    -------   ----------   -----
TOTAL............      79     10,185,310  1,593,043    926,061   12,704,414   100.0%
                      ===     ==========  =========    =======   ==========   =====
PERCENT OF TOTAL.............       80.2%      12.5%       7.3%       100.0%
NUMBER OF OFFICE AND
INDUSTRIAL PROPERTIES........         43         27          9           79
<CAPTION>
                                           ANNUALIZED RENT OF OFFICE AND
                                             INDUSTRIAL PROPERTIES (1)
                              ------------------------------------------------------
                     CLASS A                                            PERCENT
                      OFFICE         R&D      INDUSTRIAL                  OF
 MARKET/SUBMARKET   BUILDINGS    PROPERTIES   PROPERTIES     TOTAL       TOTAL
 ----------------  ------------- ----------   ----------     -----      -------
<S>                <C>           <C>          <C>         <C>           <C>
GREATER BOSTON
 East Cambridge
 (2) ............  $ 13,789,950  $ 1,366,714  $      --   $ 15,156,664     5.0%
 Route 128 NW
 Bedford, MA.....     1,590,814    3,780,214         --      5,371,028     1.8
 Billerica, MA...           --       598,478         --        598,478     0.2
 Burlington, MA..     3,257,655          --          --      3,257,655     1.1
 Lexington, MA
 (3).............    14,083,118      277,500         --     14,360,618     4.8
 Route 128/MA
 Turnpike
 Waltham, MA.....     6,691,931          --          --      6,691,931     2.2
 Route 128 SW
 Westwood, MA....           --           --    1,649,144     1,649,144     0.6
 Route 128 South
 Quincy, MA......     3,267,240          --          --      3,267,240     1.1
 Boston..........     1,080,172          --          --      1,080,172     0.4
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $ 43,760,880  $ 6,022,906  $1,649,144  $ 51,432,930    17.1%
GREATER
WASHINGTON, D.C.
 SW Washington,
 D.C.(4).........  $ 53,174,273  $       --   $      --   $ 53,174,273    17.6%
 West End
 Washington,
 D.C. ...........    12,911,442          --          --     12,911,442     4.3
 Montgomery
 County, MD
 Bethesda, MD....    14,669,523          --          --     14,669,523     4.9
 Gaithersburg, MD
 (5).............     2,156,064          --          --      2,156,064     0.7
 Fairfax County,
 VA
 Herndon, VA.....           --     1,157,431         --      1,157,431     0.4
 Reston, VA (6)..           --           --          --            --      --
 Springfield, VA
 (4)(7)..........           --     6,585,769         --      6,585,769     2.2
 Prince George's
 County, MD
 Landover, MD....           --           --    1,524,927     1,524,927     0.5
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $ 82,911,302  $ 7,743,200  $1,524,927  $ 92,179,429    30.6%
BALTIMORE, MD      $ 15,224,424  $       --   $      --   $ 15,224,424     5.0%
RICHMOND, VA(8)    $ 17,563,259  $       --   $      --   $ 17,563,259     5.8%
MIDTOWN MANHATTAN
 Park Avenue.....  $ 93,303,877  $       --   $      --   $ 93,303,877    30.9%
 Eastside........    28,874,388          --          --     28,874,388     9.6
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $122,178,265  $       --   $      --   $122,178,265    40.5%
GREATER SAN
FRANCISCO
 Hayward, CA.....  $        --   $       --   $  676,188  $    676,188     0.2%
 San Francisco,
 CA (9)..........           --     1,061,181     352,839     1,414,020     0.5
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $        --   $ 1,061,181  $1,029,027  $  2,090,208     0.7%
BUCKS COUNTY,
PA...............  $        --   $       --   $  868,699  $    868,699     0.3%
                   ------------- ------------ ----------- ------------- -------
TOTAL............  $281,638,130  $14,827,287  $5,071,797  $301,537,214   100.0%
                   ============= ============ =========== ============= =======
PERCENT OF TOTAL.............         93.4%         4.9%        1.7%        100.0%
NUMBER OF OFFICE AND
INDUSTRIAL PROPERTIES........           43           27           9            79
</TABLE>
- ----
(1) Annualized Rent is the monthly contractual rent under existing leases as
    of September 30, 1997 multiplied by twelve. 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, on an annualized basis, were
    approximately $12.9 million.
(2) Does not include 1997 Annualized Rent for one Class A Office Building
    currently under development by the Company.
(3)Does not include 1997 Annualized Rent for two Class A Office Buildings
currently under development by the Company.
(4) Certain of such Properties are leased on the basis of net usable square
    feet (which have been converted to net rentable square feet for purposes
    of this table) due to the requirements of the General Services
    Administration.
(5) The Company will own a 75.0% general partner interest in the limited
    partnership that will own this property. Because of the priority of the
    Company's partnership interest, the Company expects to receive any
    partnership distributions that are made with respect to this property.
(6) Does not include 1997 Annualized Rent for three Class A Office Buildings
    currently under development by the Company. The Company is acting as
    development manager of, and is a 25.0% member of, a limited liability
    company that will own these Properties. The Company's economic interest
    may increase above 25.0% depending upon the achievement of certain
    performance goals.
(7) Does not include 1997 Annualized Rent for two Office Properties currently
    under development by the Company.
(8) The Company has entered into a purchase and sale agreement with respect to
    this Property and anticipates closing in January 1998.
(9)The Company owns a 35.7% controlling general partnership interest in the
nine R&D Properties and two Industrial Properties located in Greater San
Francisco, California.
 
                                       8
<PAGE>
 
 
                                  THE OFFERING
 
  All of the shares of Common Stock offered hereby are being sold by the
Company.
 
<TABLE>
<S>                                        <C>
Common Stock Offered...................... 14,000,000 Shares
   U.S. Offering.......................... 11,200,000
   International Offering.................  2,800,000
Common Stock Outstanding After the
 Offering(l).............................. 52,694,041
Common Stock and OP Units Outstanding
 After the Offering(1)(2)................. 69,651,369
Use of Proceeds........................... To reduce indebtedness, to fund the
                                           acquisition of Riverfront Plaza, to
                                           fund ongoing development and for
                                           general corporate and working
                                           capital purposes
NYSE Symbol............................... "BXP"
</TABLE>
- -------
(1) Excludes 2,297,600 shares reserved for issuance upon exercise of
    outstanding options.
(2) Includes 16,957,328 OP Units. In general, after August 1998 OP Units are
    redeemable by the holders for cash or, at the election of the Company,
    shares of Common Stock on a one-for-one basis.
 
                                 DISTRIBUTIONS
 
  In respect of the period from June 23, 1997 (the completion of the Initial
Offering) through September 30, 1997, the Company paid on November 21, 1997 a
distribution of $0.44 per share of Common Stock, which represents $0.405 per
share on a quarterly basis or $1.62 per share on an annualized basis. Future
distributions by the Company will be at the discretion of the Board of
Directors and will depend on the actual cash available for distribution, its
financial condition, capital requirements, the annual distribution requirement
under the REIT provisions of the code (see "Federal Income Tax Consequences--
Requirements for Qualification"), and such other factors as the Board of
Directors deems relevant. See "Risk Factors--Changes in Policies Without
Shareholder Approval."
 
                           TAX STATUS OF THE COMPANY
 
  The Company intends to elect to be taxed as a REIT under Sections 856 through
860 of the Code, commencing with its taxable year ending December 31, 1997. The
Company believes, and has obtained an opinion of Goodwin, Procter & Hoar llp,
tax counsel to the Company ("Tax Counsel"), to the effect that, commencing with
its taxable year ending December 31, 1997, the Company will be organized in
conformity with the requirements for qualification as a REIT under the Code,
and that the Company's proposed manner of operation, including the lease of the
Hotel Properties and Garage Properties, will enable it to meet the requirements
for taxation as a REIT for federal income tax purposes. To maintain REIT
status, the Company must meet a number of organizational and operational
requirements, including a requirement that it currently distribute at least 95%
of its taxable income to its stockholders. As a REIT, the Company generally
will not be subject to federal income tax on net income it distributes
currently to its stockholders. If the Company fails to qualify as a REIT in any
taxable year, it will be subject to federal income tax at regular corporate
rates. See "Federal Income Tax Consequences--Failure to Qualify" and "Risk
Factors--Failure to Qualify as a REIT." Even if the Company qualifies for
taxation as a REIT, the Company may be subject to certain federal, state and
local taxes on its income and property.
 
                                       9
<PAGE>
 
                     SUMMARY SELECTED FINANCIAL INFORMATION
 
  The following table sets forth unaudited pro forma financial and other
information for the Company and combined historical financial information for
the Boston Properties Predecessor Group. The following summary selected
financial information should be read in conjunction with the financial
statements and notes thereto included elsewhere in this Prospectus.
 
  The combined historical balance sheets as of December 31, 1996 and 1995 and
the combined historical statements of operations for the years ended December
31, 1996, 1995 and 1994 of the Boston Properties Predecessor Group have been
derived from the historical combined financial statements audited by Coopers &
Lybrand L.L.P., independent accountants, whose report with respect thereto is
included elsewhere in this Prospectus.
 
  The selected financial data at and for the nine months ended September 30,
1997 (which includes the Company and the Boston Properties Predecessor Group)
and for the nine months ended September 30, 1996 are derived from unaudited
financial statements. The unaudited financial information includes all
adjustments (consisting of normal recurring adjustments) that management
considers necessary for fair presentation of the combined financial position
and results of operations for these periods. Combined operating results for the
nine months ended September 30, 1997 are not necessarily indicative of the
results to be expected for the entire year ending December 31, 1997.
 
  Unaudited pro forma adjustments and operating information for the nine months
ended September 30, 1997 and the year ended December 31, 1996 is presented as
if the completion of the Initial Offering, the Formation Transactions, the
Offering, and the acquisitions subsequent to September 30, 1997 had occurred at
January 1, 1996, and the effect thereof was carried forward through the nine
months ended September 30, 1997. By necessity, such pro forma operating
information incorporates certain assumptions which are described in the notes
to the Pro Forma Condensed Consolidated Statements of Operations included
elsewhere in this Prospectus. The unaudited pro forma balance sheet data is
presented as if the aforementioned transactions had occurred on September 30,
1997.
 
  The pro forma information does not purport to represent what the Company's
financial position or results of operations would actually have been if these
transactions had, in fact, occurred on such date or at the beginning of the
period indicated, or to project the Company's financial position or results of
operations at any future date or for any future period.
 
                                       10
<PAGE>
 
            THE COMPANY AND THE BOSTON PROPERTIES PREDECESSOR GROUP
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                THE COMPANY           THE PREDECESSOR GROUP   THE COMPANY
                        --------------------------- ------------------------- ------------
                                                    HISTORICAL
                          PRO FORMA   ---------------------------------------
                         NINE MONTHS    JUNE 23,    JANUARY 1,   NINE MONTHS   PRO FORMA
                            ENDED        1997 TO      1997 TO       ENDED      YEAR ENDED
                        SEPTEMBER 30, SEPTEMBER 30,  JUNE 22,   SEPTEMBER 30, DECEMBER 31,
                            1997          1997         1997         1996          1996
                        ------------- ------------- ----------- ------------- ------------
                         (UNAUDITED)   (UNAUDITED)  (UNAUDITED)  (UNAUDITED)  (UNAUDITED)
<S>                     <C>           <C>           <C>         <C>           <C>
OPERATING DATA:
Revenues(1).....         $  253,153    $   68,353    $129,818     $202,319      $324,290
Income (loss)
 before
 extraordinary
 items..........             44,079        14,854       4,605        8,160        47,315
Net income
 (loss).........                --         22,779       4,605        8,160           --
Per Share of
 Common Stock
 Data:
Income before
 extraordinary
 items                   $      .84    $      .38         --           --       $    .90
Net income......                --     $      .59         --           --            --
Weighted average
 number of
 shares
 outstanding....             52,694        38,694         --           --         52,694
Weighted average
 number of
 shares and
 OP Units
 outstanding....             69,651        54,760         --           --         69,651
BALANCE SHEET
 DATA, AT PERIOD
 END:
Real estate,
 before
 accumulated
 depreciation...         $1,954,753    $1,433,376         --           --            --
Real estate,
 after
 accumulated
 depreciation...          1,669,248     1,147,871         --           --            --
Cash and cash
 equivalents....            201,631        25,989         --           --            --
Total assets....          1,995,515     1,295,638         --           --            --
Total
 indebtedness...          1,216,414       985,614         --           --            --
Stockholders' or
 owners' equity
 (deficiency)...            636,558       195,481         --           --            --
OTHER DATA:
Funds from
 Operations(2)
 (unaudited)....         $   95,236    $   30,879     $21,450     $ 34,652      $104,892
Company's Funds
 from Operations
 (unaudited)....             72,045        21,818         --           --         79,351
EBITDA(3)(unaudited)..      165,352        47,106      74,838      117,525       207,675
Company's EBITDA
 (unaudited)....            125,087        33,284         --           --        157,106
Cash flow
 provided by
 operating
 activities(4)..                --     $   25,930    $ 25,226     $ 31,109           --
Cash flow used
 in investing
 activities(4)..                --       (356,794)    (32,844)     (42,952)          --
Cash flow
 provided by
 (used in)
 financing
 activities(4)..                --        356,853       9,130       (1,555)          --
<CAPTION>
                                       THE PREDECESSOR GROUP
                        --------------------------------------------------------
                                            HISTORICAL
                                      YEAR ENDED DECEMBER 31,
                        --------------------------------------------------------
                           1996        1995       1994       1993       1992
                        ----------- ----------- ---------- ---------- ----------
<S>                     <C>         <C>         <C>        <C>        <C>
OPERATING DATA:
Revenues(1).....        $  269,933  $  248,725  $ 244,083  $ 245,561  $ 241,212
Income (loss)
 before
 extraordinary
 items..........             8,273      (3,983)     7,171     17,086     16,010
Net income
 (loss).........             7,279      (3,983)     7,171     17,086     16,010
Per Share of
 Common Stock
 Data:
Income before
 extraordinary
 items                         --          --         --         --         --
Net income......               --          --         --         --         --
Weighted average
 number of
 shares
 outstanding....               --          --         --         --         --
Weighted average
 number of
 shares and
 OP Units
 outstanding....               --          --         --         --         --
BALANCE SHEET
 DATA, AT PERIOD
 END:
Real estate,
 before
 accumulated
 depreciation...        $1,035,571  $1,012,324  $ 984,853  $ 983,751  $ 982,348
Real estate,
 after
 accumulated
 depreciation...           771,660     773,810    770,763    789,234    811,815
Cash and cash
 equivalents....             8,998      25,867     46,289     50,697     28,841
Total assets....           896,511     922,786    940,155    961,715    971,648
Total
 indebtedness...         1,442,476   1,401,408  1,413,331  1,426,882  1,417,940
Stockholders' or
 owners' equity
 (deficiency)...          (576,632)   (506,653)  (502,230)  (495,104)  (480,398)
OTHER DATA:
Funds from
 Operations(2)
 (unaudited)....        $   36,318  $   29,151  $  39,568  $  49,240  $  50,097
Company's Funds
 from Operations
 (unaudited)....               --          --         --         --         --
EBITDA(3)(unaudited)..     153,566     138,321    137,269    140,261    142,627
Company's EBITDA
 (unaudited)....               --          --         --         --         --
Cash flow
 provided by
 operating
 activities(4)..        $   51,531  $   29,092  $  45,624  $  59,834  $  50,468
Cash flow used
 in investing
 activities(4)..           (23,689)    (36,844)   (18,424)    (9,437)   (48,257)
Cash flow
 provided by
 (used in)
 financing
 activities(4)..           (44,711)    (12,670)   (31,608)   (28,540)     1,365
</TABLE>
- -------
(1) Pro forma revenue for the nine month period ended September 30, 1997 and
    the year ended December 31, 1996 includes the lease revenue that the
    Company has/will receive under the lease for the two Hotel Properties.
    After entering into such lease, the Company has not/will not recognize
    direct hotel revenues and expenses.
(2) 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. The Company 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 the Company to incur and service debt, to make capital
    expenditures and to fund other cash needs. The Company 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 differently than the Company. Funds
    from Operations does not represent cash generated from operating activities
    determined in accordance with GAAP and should not be considered as an
    alternative to net income (determined in accordance with GAAP) as an
    indication of the Company's financial performance or to cash flow from
    operating activities (determined in accordance with GAAP) as a measure of
    the Company's liquidity, nor is it indicative of funds available to fund
    the Company's cash needs, including its ability to make cash distributions.
(3) EBITDA means operating income before mortgage and other interest, income
    taxes, depreciation and amortization. The Company believes EBITDA is useful
    to investors as an indicator of the Company's ability to service debt or
    pay cash distributions. EBITDA, as calculated by the Company, is not
    comparable to EBITDA reported by other REITs that do not define EBITDA
    exactly as the Company defines that term. EBITDA should not be considered
    as an alternative to operating income or net income (determined in
    accordance with GAAP) as an indicator of operating performance or as an
    alternative to cash flows from operating activities (determined in
    accordance with GAAP) as an indicator of liquidity and other combined or
    consolidated income or cash flow statement data (determined in accordance
    with GAAP).
(4) Pro forma information relating to cash flow from operating, investing and
    financing activities has not been included because the Company believes
    that the information would not be meaningful due to the number of
    assumptions required in order to calculate this information.
 
                                       11
<PAGE>
 
                                 RISK FACTORS
 
  Prospective investors should carefully consider the following matters before
purchasing shares of Common Stock in this Offering.
 
  This Prospectus contains forward-looking statements within the meaning of
Section 27A of the Securities Act of 1933, as amended (the "Securities Act"),
and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-
looking statements are inherently subject to risks and uncertainties, many of
which cannot be predicted with accuracy and some of which might not even be
anticipated. Future events and actual results, financial and otherwise, may
differ materially from the results discussed in the forward-looking
statements. Factors that might cause such a difference include, but are not
limited to, those discussed in "Risk Factors" and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" herein.
 
THE COMPANY MAY NOT ACHIEVE EXPECTED RETURNS ON PROPERTY ACQUISITIONS
 
  The Company intends to continue to investigate and pursue acquisitions of
properties and portfolios of properties, including large portfolios that could
significantly increase the size of the Company and alter its capital
structure. There can be no assurance that the Company will be able to
assimilate acquisitions of properties, and in particular acquisitions of
portfolios of properties, or achieve the Company's intended return on
investment.
 
THE COMPANY'S INVESTMENTS IN PROPERTY DEVELOPMENT MAY NOT YIELD EXPECTED
RETURNS
 
  The Company intends to continue to pursue the development of office,
industrial and hotel properties. See "Business and Growth Strategies." To the
extent that the Company engages in such development activities, it will be
subject to the risks normally associated with such activities. Such risks
include, without limitation, risks relating to the availability and timely
receipt of zoning, land use, building, occupancy, and other regulatory
approvals, the cost and timely completion of construction (including risks
from causes beyond the Company's control, such as weather, labor conditions or
material shortages) and the availability of construction financing on
favorable terms. These risks could result in substantial unanticipated delays
or expense and, under certain circumstances, could prevent completion of
development activities once undertaken, any of which could have an adverse
effect on the financial condition and results of operations of the Company and
on the amount of funds available for distribution to stockholders.
 
CONFLICTS OF INTEREST EXIST BETWEEN THE COMPANY AND MESSRS. ZUCKERMAN AND
LINDE IN CONNECTION WITH THE OPERATION OF THE COMPANY
 
  For a period of time, sales of properties and repayment of indebtedness will
have different effects on holders of OP Units than on stockholders. Certain
holders of OP Units, including Messrs. Zuckerman and Linde, will incur adverse
tax consequences upon the sale of certain of the Properties owned by the
Company and on the repayment of indebtedness which are different from the tax
consequences to the Company and persons who purchase shares of Common Stock in
the Offering. Consequently, such holders may have different objectives
regarding the appropriate pricing and timing of any such sale or repayment of
indebtedness. While the Company has the exclusive authority under the
Operating Partnership Agreement to determine whether, when, and on what terms
to sell a Property (other than a Designated Property) or when to refinance or
repay indebtedness, any such decision would require the approval of the Board
of Directors. As Directors of the Company, Messrs. Zuckerman and Linde have
substantial influence with respect to any such decision, and such influence
could be exercised in a manner inconsistent with the interests of some, or a
majority, of the Company's stockholders, including in a manner which could
prevent completion of a Property sale or the repayment of indebtedness.
 
  In this connection, the Operating Partnership Agreement provides that, until
June 23, 2007, the Operating Partnership may not sell or otherwise transfer a
Designated Property (defined as One and Two Independence Square, 599 Lexington
Avenue and Capital Gallery) in a taxable transaction without the prior consent
of Messrs. Zuckerman and Linde. Similarly, the Company has agreed with the
party that contributed 875 Third Avenue to the Operating Partnership that the
Company will not sell or otherwise transfer that Property in a taxable
transaction until November 21, 2007 without the consent of that party. The
Designated Properties and 875 Third Avenue comprised approximately 27.7% of
the Company's pro forma Funds from Operations for the nine months ended
September 30, 1997. The Operating Partnership is not, however, required to
obtain the aforementioned consent from the party protected thereby if at any
time during this period the protected party does not continue to hold at least
a specified percentage of such protected party's original OP Units.
 
                                      12
<PAGE>
 
  Messrs. Zuckerman and Linde will continue to engage in other
activities. Messrs. Zuckerman and Linde have a broad and varied range of
investment interests. It is possible that companies in which one or both of
Messrs. Zuckerman and Linde has or may acquire an interest, and which are not
directly involved in real estate investment activities, will be owners of real
property and will acquire real property in the future. However, pursuant to
Mr. Linde's employment agreement and Mr. Zuckerman's non-compete agreement
with the Company, Messrs. Zuckerman and Linde will not, in general, have
management control over such companies and, therefore, they may not be able to
prevent one or more such companies from engaging in activities that are in
competition with activities of the Company. See "Management--Employment and
Noncompetition Agreements."
 
THE COMPANY RELIES ON KEY PERSONNEL WHOSE CONTINUED SERVICE IS NOT GUARANTEED
 
  The Company is dependent on the efforts of Messrs. Zuckerman and Linde and
other senior management personnel. Messrs. Zuckerman and Linde in particular
have national reputations which aid the Company in negotiations with lenders
and in having investment opportunities brought to the Company. The other
executive officers of the Company who serve as managers of the Company's
offices (Messrs. Burke, Ritchey, Barrett and Selsam) have strong regional
reputations which aid the Company in identifying opportunities, or having
opportunities brought to the Company, and in negotiating with tenants or
build-to-suit prospects. While the Company believes that it could find
replacements for these key executives, the loss of their services could have a
material adverse effect on the operations of the Company in that the extent
and nature of the Company's relationships with lenders and prospective tenants
and with persons in the industry who may have access to investment
opportunities would be diminished. While Mr. Linde and the other executive
officers have employment agreements with the Company pursuant to which they
have agreed to devote substantially all of their business time to the business
and affairs of the Company and to not have substantial outside business
interests, this can serve as no guarantee that they will remain with the
Company for any specified term. Mr. Zuckerman, who has significant outside
business interests, including serving as Chairman of the Board of Directors of
U.S. News & World Report, The Atlantic Monthly magazine, the New York Daily
News and Applied Graphics Technologies and as a member of the Board of
Directors of Snyder Communications, does not have an employment agreement with
the Company and serves as a non-executive officer of the Company with the
title "Chairman of the Board of Directors." Mr. Zuckerman has historically
devoted a significant portion of his business time to the affairs of the
Company, although over the last twenty years less than a majority of his
business time, in the aggregate, has been spent on the Company's affairs.
Although Mr. Zuckerman cannot assure the Company that he will continue to
devote any specific portion of his time to the Company and has therefore
declined to enter into an employment agreement with the Company, Mr. Zuckerman
has no present commitments inconsistent with his current level of involvement
with the Company. See "Management--Employment and Noncompetition Agreements."
 
THE COMPANY'S PERFORMANCE AND VALUE ARE SUBJECT TO RISKS ASSOCIATED WITH THE
REAL ESTATE INDUSTRY
 
  Lease expirations could adversely affect the Company's cash flow. The
Company will be subject to the risks that, upon expiration, leases for space
in the Office Properties or the Industrial Properties may not be renewed, the
space may not be re-leased, or the terms of renewal or re-lease (including the
cost of required renovations or concessions to tenants) may be less favorable
than current lease terms. Leases on a total of 8.0% and 6.8% of the aggregate
net rentable area of the Office Properties and the Industrial Properties
expire during 1998 and 1999, respectively. If the Company were unable to re-
lease substantial amounts of vacant space promptly, if the rental rates upon
such re-lease were significantly lower than expected, or if reserves for costs
of re-leasing proved inadequate, the cash flow to the Company would be
decreased and the Company's ability to make distributions to stockholders
would be adversely affected.
 
  Hotel operating risks could adversely affect the Company's cash flow. The
Hotel Properties are subject to all operating risks common to the hotel
industry. These risks include, among other things: (i) competition for guests
from other hotels, a number of which may have greater marketing and financial
resources than the Company and Marriott(R); (ii) increases in operating costs
due to inflation and other factors, which increases may not have been offset
in recent years, and may not be offset in the future by increased room rates;
(iii) dependence on business and commercial travelers and tourism, which
business may fluctuate and be seasonal; (iv) increases in energy costs and
other expenses of travel, which may deter travelers; and (v) adverse effects
of general and
 
                                      13
<PAGE>
 
local economic conditions. These factors could adversely affect the ability of
Marriott(R) to generate revenues and for ZL Hotel LLC to make lease payments
and, therefore, the Company's ability to make expected distributions to
stockholders. Because the lease payments to the Company from ZL Hotel LLC are
based on a participation in the gross receipts of the Hotel Properties, the
actual lease payments will increase or decrease over the term of the lease in
response to fluctuations in the gross receipts of the Hotel Properties.
 
  Acquisition risks could adversely affect the Company. There can be no
assurance that the Company will be able to implement its investment strategies
successfully or that its property portfolio will expand at all, or at any
specified rate or to any specified size. In addition, investment in additional
real estate assets is subject to a number of risks. In particular, investments
are expected to be financed with funds drawn under the Unsecured Line of
Credit, which would subject the Company to the risks described under "--Impact
of Debt on the Company's Cash Flow." The Company does not intend to limit its
investments to the markets in which the Properties are currently primarily
located. Consequently, to the extent that it elects to invest in additional
markets, the Company also will be subject to the risks associated with
investment in new markets, with which management may have relatively little
experience and familiarity. Investment in additional real estate assets also
entails the other risks associated with real estate investment generally.
 
  Uncontrollable factors affecting the Properties' performance and value could
produce lower returns. The economic performance and value of the Company's
real estate assets is subject to all of the risks incident to the ownership
and operation of real estate. These include the risks normally associated with
changes in national, regional and local economic and market conditions. The
Properties are primarily located in three markets, Greater Boston, Greater
Washington, D.C., and midtown Manhattan. The economic condition of each of
such markets may be dependent on one or more industries. An economic downturn
in one of these industry sectors may have an adverse effect on the Company's
performance in such market. Local real estate market conditions may include a
large supply of competing space and competition for tenants, including
competition based on rental rates, attractiveness and location of the Property
and quality of maintenance, insurance and management services. Economic and
market conditions may impact the ability of tenants to make lease payments. In
addition, other factors may adversely affect the performance and value of a
Property, including changes in laws and governmental regulations (including
those governing usage, zoning and taxes), changes in interest rates and the
availability of financing. If the Properties do not generate sufficient income
to meet operating expenses, including future debt service, the Company's
income and ability to make distributions to its stockholders will be adversely
affected.
 
  Illiquidity of real estate investments could adversely affect the Company's
financial condition. Because real estate investments are relatively illiquid,
the Company's ability to vary its portfolio promptly in response to economic
or other conditions will be limited. In addition, certain significant
expenditures, such as debt service (if any), 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 the Company to respond to adverse
changes in the performance of its investments could have an adverse effect on
the Company's financial condition and results of operations.
 
  Liability for environmental matters could adversely affect the Company's
financial condition. Under various federal, state and local laws, ordinances
and regulations, an owner or operator of real property may become liable for
the costs of removal or remediation of certain hazardous or toxic substances
released on or in its property, as well as certain other costs relating to
hazardous or toxic substances. Such liability may be imposed without regard to
whether the owner or operator knew of, or was responsible for, the release of
such substances. The presence of, or the failure to remediate properly, such
substances, when released, may adversely affect the owner's ability to sell
the affected real estate or to borrow using such real estate as collateral.
Such costs or liabilities could exceed the value of the affected real estate.
The Company has not been notified by any governmental authority of any
noncompliance, liability or other claim in connection with any of the
Properties and the Company is not aware of any other environmental condition
with respect to any of the Properties that management believes would have a
material adverse effect on the Company's business, assets or results of
operations.
 
  Some of the Properties are located in urban and industrial areas where fill
or current or historic industrial uses of the areas have caused site
contamination. With respect to all of the Properties, independent
environmental consultants have been retained in the past to conduct or update
Phase I environmental assessments (which
 
                                      14
<PAGE>
 
generally do not involve invasive techniques such as soil or ground water
sampling) and asbestos surveys on all of the Properties. These environmental
assessments have not revealed any environmental conditions that the Company
believes will have a material adverse effect on its business, assets or
results of operations, and the Company is not aware of any other environmental
condition with respect to any of the Properties which the Company believes
would have such a material adverse effect. However, the Company is aware of
environmental conditions at two of the Properties that may require
remediation. With respect to 17 Hartwell Avenue in Lexington, Massachusetts,
the Company received a Notice of Potential Responsibility from the state
regulatory authority on January 9, 1997, related to groundwater contamination,
as well as Notices of Downgradient Property Status Submittals from third
parties concerning contamination at two downgradient properties. On January
15, 1997, the Company notified the state regulatory authority that it would
cooperate with and monitor the tenant at the Property which is investigating
this matter. That investigation is underway and has identified the presence of
hazardous substances in a catch basin along the property line. It is expected
that the tenant will take any necessary response actions. The 91 Hartwell
Avenue Property in Lexington, Massachusetts was listed by the state regulatory
authority as an unclassified Confirmed Disposal Site in connection with
groundwater contamination. The Company engaged a specially licensed
environmental consultant to perform the necessary investigation and assessment
and to prepare submittals to the state regulatory authority. On August 1,
1997, such consultant submitted to the state regulatory authority a Phase I--
Limited Site Investigation Report and Downgradient Property Status Opinion.
This Opinion concluded that the property qualifies for Downgradient Property
Status under the state regulatory program. Downgradient Property Status
eliminates certain deadlines for conducting response actions at a site.
Although the Company believes that the current or former owners of the
upgradient source properties may ultimately be responsible for some or all of
the costs of such response actions, the Company will take any necessary
further response actions. See "Business and Properties--Environmental
Matters."
 
  No assurance can be given that the environmental assessments and updates
identified all potential environmental liabilities, that no prior owner
created any material environmental condition not known to the Company or the
independent consultants preparing the assessments, that no environmental
liabilities may have developed since such environmental assessments were
prepared, or that future uses or conditions (including, without limitation,
changes in applicable environmental laws and regulations) will not result in
imposition of environmental liability.
 
  The cost of complying with the Americans with Disabilities Act could
adversely affect the Company's cash flow. The Properties are subject to the
requirements of the Americans with Disabilities Act (the "ADA"), which
generally requires that public accommodations, including office buildings, be
made accessible to disabled persons. The Company believes that the Properties
are in substantial compliance with the ADA and that it will not be required to
make substantial capital expenditures to address the requirements of the ADA.
However, compliance with the ADA could require removal of access barriers and
noncompliance could result in imposition of fines by the federal government or
the award of damages to private litigants. If, pursuant to the ADA, the
Company were required to make substantial alterations in one or more of the
Properties, the Company's financial condition and results of operations, as
well as the amount of funds available for distribution to stockholders, could
be adversely affected.
 
  Uninsured losses could adversely affect the Company's cash flow. The Company
carries comprehensive liability, fire, flood, extended coverage and rental
loss insurance, as applicable, with respect to the Properties, with policy
specification and insured limits customarily carried for similar properties.
In the opinion of management, all of the Properties are adequately insured.
There are, however, certain types of losses (such as from wars or catastrophic
acts of nature) that may be either uninsurable or not economically insurable.
Any uninsured loss could result in both loss of cash flow from, and asset
value of, the affected property.
 
  New owner's title insurance policies were not obtained in connection with
the Formation Transactions. Prior to the Initial Offering, each of the
Properties was insured by title insurance policies insuring the interests of
the Property-owning entities. Certain of these title insurance policies may
continue to benefit those Property-owning entities which remained after the
completion of the Formation Transactions. Nevertheless, each such title
insurance policy may be in an amount less than the current value of the
applicable Property. In the event of a loss with respect to a Property
relating to a title defect, the Company could lose both its capital invested
in and anticipated profits from such Property.
 
                                      15
<PAGE>
 
  Changes in tax and environmental laws could adversely affect the Company's
financial condition. Costs resulting from changes in real estate taxes
generally may be passed through to tenants and will not affect the Company.
Increases in income, service or transfer taxes, however, generally are not
passed through to tenants and may adversely affect the Company's results of
operations and the amount of funds available to make distributions to
stockholders. Similarly, changes in laws increasing the potential liability
for environmental conditions existing on properties or increasing the
restrictions on discharges or other conditions may result in significant
unanticipated expenditures, which would adversely affect the Company's
financial condition and results of operations and the amount of funds
available for distribution to stockholders.
 
THE COMPANY'S USE OF DEBT TO FINANCE ACQUISITIONS AND DEVELOPMENTS COULD
ADVERSELY AFFECT THE COMPANY
 
  The required repayment of debt or of interest thereon can adversely affect
the Company. Upon completion of the Offering, the Company expects to have
approximately $1.2 billion of outstanding indebtedness. As of December 1,
1997, the Company also had an outstanding balance of $233.0 million under the
Unsecured Line of Credit. Advances under the Unsecured Line of Credit bear
interest at a variable rate. In addition, the Company may incur other variable
rate indebtedness in the future. Increases in interest rates on such
indebtedness would increase the Company's interest expense (e.g., assuming the
entire $300.0 million available under the Unsecured Line of Credit is
outstanding, the Company would incur an additional $750,000 in interest
expense per year for each 0.25% increase in interest rates), which could
adversely affect the Company's cash flow and its ability to pay expected
distributions to stockholders. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Liquidity and Capital
Resources." The Company is subject to risks normally associated with debt
financing, including the risk that the Company's cash flow will be
insufficient to meet required payments of principal and interest, the risk
that any indebtedness will not be able to be refinanced or that the terms of
any such refinancing will not be as favorable as the terms of such
indebtedness. The mortgage loans secured by the One Independence Square and
Two Independence Square properties are cross-defaulted as to each other. If an
event of default were to occur under either of the loans, the Company could be
required to repay approximately $199.3 million, together with any applicable
prepayment charges, prior to the scheduled maturity dates of the loans. In
addition, the Unsecured Line of Credit is cross-defaulted with respect to
future recourse indebtedness of the Company if the Company is in default with
respect to an aggregate of $50.0 million or more of such recourse
indebtedness.
 
  The Company's policy of no limitation on debt could adversely affect the
Company's cash flow. Upon completion of the Offering, the Company's debt to
total market capitalization ratio will be approximately 34.4% (33.8% if the
Underwriters' overallotment option is exercised in full). The Company does not
have a policy limiting the amount of debt that the Company may incur.
Accordingly, the Company could become more highly leveraged, resulting in an
increase in debt service that could adversely affect the Company's cash flow
and, consequently, the amount available for distribution to stockholders, and
could increase the risk of default on the Company's indebtedness.
 
FAILURE TO QUALIFY AS A REIT WOULD CAUSE THE COMPANY TO BE TAXED AS A
CORPORATION
 
  The Company will be taxed as a corporation if it fails to qualify as a
REIT. The Company intends to operate so as to qualify as a REIT under the
Code, commencing with its taxable year ending December 31, 1997. Although
management of the Company believes that it is organized and will continue to
operate in such a manner, no assurance can be given that it will so qualify or
that it will continue to qualify in the future. In this regard, the Company
has received an opinion of Goodwin, Procter & Hoar llp, tax counsel to the
Company ("Tax Counsel"), to the effect that, commencing with its taxable year
ending December 31, 1997, the Company will be organized in conformity with the
requirements for qualification as a REIT under the Code, and that the
Company's manner of operation, including the lease of the Hotel Properties and
Garage Properties, will enable it to meet the requirements for taxation as a
REIT for federal income tax purposes. Qualification as a REIT, however,
involves the application of highly technical and complex Code provisions as to
which there are only limited judicial and administrative interpretations.
Certain facts and circumstances which may be wholly or partially beyond the
Company's control may affect its ability to qualify as a REIT. In addition, no
assurance can be given that future legislation, new regulations,
administrative interpretations or court decisions will not significantly
change the tax laws (or the application thereof) with respect to qualification
as a REIT for federal income tax purposes or the federal income tax
consequences of such qualification. Recently enacted legislation
 
                                      16
<PAGE>
 
has liberalized certain of the requirements for REIT qualification for tax
years beginning after August 5, 1997 and the Company is not aware of any
proposal to amend the tax laws that would significantly and adversely affect
the Company's ability to qualify as a REIT. The opinion of Tax Counsel is not
binding on the Internal Revenue Service (the "IRS") or the courts.
 
  If, in any taxable year, the Company were to fail to qualify as a REIT for
federal income tax purposes, it would not be allowed a deduction for
distributions to stockholders in computing taxable income and would be subject
to federal income tax (including any applicable alternative minimum tax) on
its taxable income at regular corporate rates. In addition, unless entitled to
relief under certain statutory provisions, the Company would be disqualified
from treatment as a REIT for federal income tax purposes for the four taxable
years following the year during which qualification is lost. The additional
tax liability resulting from the failure to qualify as a REIT would
significantly reduce the amount of funds available for distribution to
stockholders. In addition, the Company would no longer be required to make
distributions to shareholders. Although the Company intends to continue to
operate in a manner designed to permit it to qualify as a REIT for federal
income tax purposes, it is possible that future economic, market, legal, tax
or other events or circumstances could cause it to fail to so qualify. See
"Federal Income Tax Consequences--Requirements for Qualification."
 
  To qualify as a REIT the Company will need to maintain a certain level of
distributions. To obtain and maintain its status as a REIT for federal income
tax purposes, the Company generally will be required each year to distribute
to its stockholders at least 95% of its taxable income. In addition, the
Company will be subject to a 4% nondeductible excise tax on the amount, if
any, by which certain distributions paid by it with respect to any calendar
year are less than the sum of 85% of its ordinary income for such calendar
year, 95% of its capital gain net income other than such capital gain net
income which the REIT elects to retain and pay tax on for the calendar year
and any amount of such income that was not distributed in prior years. The
Company may be required, under certain circumstances, to accrue as income for
tax purposes interest, rent and other items treated as earned for tax purposes
but not yet received. In addition, the Company may be required not to accrue
as expenses for tax purposes certain items which actually have been paid. It
is also possible that the Company could realize income, such as income from
cancellation of indebtedness, which is not accompanied by cash proceeds.
Furthermore, the Company's depreciation deductions with respect to the
Properties acquired by the Operating Partnership by contribution from or
merger with the Property Partnership may be less than if the Company had
acquired its interests in the Properties directly for cash. In any such event,
the Company could have taxable income in excess of cash available for
distribution. In such circumstances, the Company could be required to borrow
funds or liquidate investments on unfavorable terms in order to meet the
distribution requirement applicable to a REIT. See "Federal Income Tax
Consequences--Requirements for Qualification."
 
  The Company intends to make distributions to stockholders sufficient to
comply with the 95% distribution requirement and to avoid the 4% nondeductible
excise tax described above. No assurances can be given, however, that the
Company will satisfy these requirements.
 
  Other Tax Liabilities. Even if it qualifies as a REIT for federal income tax
purposes, the Company may, and certain of its subsidiaries will, be subject to
certain federal, state and local taxes on their income and property. See
"Federal Income Tax Consequences--State and Local Tax."
 
THE ABILITY OF STOCKHOLDERS TO CONTROL THE POLICIES OF THE COMPANY AND EFFECT
A CHANGE OF CONTROL OF THE COMPANY IS LIMITED
 
  Stockholder approval is not required to change policies of the Company. The
Company's operating and financial policies, including its policies with
respect to acquisitions, growth, operations, indebtedness, capitalization and
distributions, are determined by the Company's Board of Directors.
Accordingly, stockholders have little direct control over the Company's
policies.
 
  Stockholder approval is not required to engage in investment activity. The
Company expects to continue to acquire additional real estate assets pursuant
to its investment strategies and consistent with its investment policies. See
"Business and Growth Strategies--Growth Strategies--External Growth" and
"Policies with Respect to Certain Activities--Investment Policies." The
stockholders of the Company will generally not be
 
                                      17
<PAGE>
 
entitled to receive historical financial statements regarding, or to vote on,
any such acquisition and, instead, will be required to rely entirely on the
decisions of management (although in the case of acquisitions that are
material, the Company will, as required by federal securities law, provide
financial information regarding the acquisition in public filings.)
 
  Stock ownership limit in the Certificate could inhibit changes in
control. In order to maintain its qualification as a REIT for federal income
tax purposes, not more than 50% in value of the outstanding stock of the
Company may be owned, directly or indirectly, by five or fewer individuals (as
defined in the Code to include certain entities). See "Federal Income Tax
Consequences--Requirements for Qualification." In order to facilitate
maintenance of its qualification as a REIT for federal income tax purposes,
and to otherwise address concerns relating to concentration of capital stock
ownership, the Company generally has prohibited ownership, directly or by
virtue of the attribution provisions of the Code, by any single stockholder
(which does not include certain pension plans or mutual funds) of more than
6.6% of the issued and outstanding shares of the Company's Common Stock (the
"Ownership Limit"). The Board of Directors may waive or modify the Ownership
Limit with respect to one or more persons if it is satisfied, based upon the
advice of tax counsel, that ownership in excess of this limit will not
jeopardize the Company's status as a REIT for federal income tax purposes.
Notwithstanding the above, the Company's Certificate provides that each of
Messrs. Zuckerman and Linde, along with certain family members and affiliates
of each of Messrs. Zuckerman and Linde, respectively, as well as, in general,
pension plans and mutual funds, may actually and beneficially own up to 15% of
the outstanding shares of Common Stock. The Ownership Limit may have the
effect of inhibiting or impeding a change in control and, therefore, could
adversely affect the stockholders' ability to realize a premium over the then-
prevailing market price for the Common Stock in connection with such a
transaction.
 
  Provisions in the Certificate and Bylaws and in the Operating Partnership
Agreement could prevent acquisitions and changes in control. Certain
provisions of the Company's Certificate and Bylaws (the "Bylaws") and of the
Operating Partnership Agreement may have the effect of inhibiting a third
party from making an acquisition proposal for the Company or of impeding a
change in control of the Company under circumstances that could otherwise
provide the holders of shares of Common Stock with the opportunity to realize
a premium over the then-prevailing market price of such shares. The Ownership
Limit described in the preceding paragraph also may have the effect of
precluding acquisition of control of the Company even if such a change in
control were in the best interests of some, or a majority, of the Company's
stockholders. In addition, the Board of Directors has been divided into three
classes, the initial terms of which expire in 1998, 1999 and 2000, with
directors of a given class chosen for three-year terms upon expiration of the
terms of the members of that class. The staggered terms of the members of the
Board of Directors may adversely affect the stockholders' ability to effect a
change in control of the Company, even if such a change in control were in the
best interests of some, or a majority, of the Company's stockholders. See
"Management--Directors and Executive Officers." The Certificate authorizes the
Board of Directors to issue shares of preferred stock ("Preferred Stock") in
series and to establish the rights and preferences of any series of Preferred
Stock so issued. See "Description of Capital Stock--Preferred Stock" and
"Certain Provisions of Delaware Law and the Company's Certificate and Bylaws--
The Board of Directors." The issuance of Preferred Stock also could have the
effect of delaying or preventing a change in control of the Company, even if
such a change in control were in the best interests of some, or a majority, of
the Company's stockholders. No shares of Preferred Stock will be issued or
outstanding immediately subsequent to the Offering and the Company has no
present intention to issue any such shares. Prior to the completion of the
Initial Offering, the Company authorized the issuance of a series of preferred
stock in connection with the adoption of a shareholder rights plan. See
"Description of Capital Stock--Shareholder Rights Agreement."
 
  The Operating Partnership Agreement provides that the Company may not
generally engage in any merger, consolidation or other combination with or
into another person or sale of all or substantially all of its assets, or any
reclassification, or any recapitalization or change of outstanding shares of
Common Stock (a "Business Combination"), unless the holders of OP Units will
receive, or have the opportunity to receive, the same consideration per OP
Unit as holders of Common Stock receive per share of Common Stock in the
transaction; if holders of OP Units will not be treated in such manner in
connection with a proposed Business Combination, the Company may not engage in
such transaction unless limited partners (other than the Company) holding at
 
                                      18
<PAGE>
 
least 75% of the OP Units held by limited partners vote to approve the
Business Combination. In addition, the Company, as general partner of the
Operating Partnership, has agreed in the Operating Partnership Agreement with
the limited partners that the Company will not consummate a Business
Combination in which the Company conducted a vote of the stockholders unless
the matter would have been approved had holders of OP Units been able to vote
together with the stockholders on the transaction. The foregoing provision of
the Operating Partnership Agreement would under no circumstances enable or
require the Company to engage in a Business Combination which required the
approval of the Company's stockholders if the Company's stockholders did not
in fact give the requisite approval. Rather, if the Company's stockholders did
approve a Business Combination, the Company would not consummate the
transaction unless (i) the Company as general partner first conducts a vote of
holders of OP Units (including the Company) on the matter, (ii) the Company
votes the OP Units held by it in the same proportion as the stockholders of
the Company voted on the matter at the stockholder vote, and (iii) the result
of such vote of the OP Unit holders (including the proportionate vote of the
Company's OP Units) is that had such vote been a vote of stockholders, the
Business Combination would have been approved by the stockholders. As a result
of these provisions of the Operating Partnership, a third party may be
inhibited from making an acquisition proposal that it would otherwise make, or
the Company, despite having the requisite authority under its Certificate of
Incorporation, may be prohibited from engaging in a proposed business
combination.
 
  Shareholder Rights Agreement could inhibit changes in control. The Company
has adopted a Shareholder Rights Agreement. Under the terms of the Shareholder
Rights Agreement, in general, if a person or group acquires more than 15% of
the outstanding shares of Common Stock (an "Acquiring Person"), all other
Stockholders will have the right to purchase securities from the Company at a
discount to such securities' fair market value, thus causing substantial
dilution to the Acquiring Person. The Shareholder Rights Agreement may have
the effect of inhibiting or impeding a change in control and, therefore, could
adversely affect the stockholders' ability to realize a premium over the then-
prevailing market price for the Common Stock in connection with such a
transaction. In addition, since the Board of Directors of the Company can
prevent the Shareholder Rights Agreement from operating in the event the Board
approves of an Acquiring Person, the Shareholder Rights Agreement gives the
Board significant discretion over whether a potential acquiror's efforts to
acquire a large interest in the Company will be successful. Because the
Shareholder Rights Agreement contains provisions that are designed to assure
that Messrs. Zuckerman and Linde and their affiliates will never, alone, be
considered a group that is an Acquiring Person, and because the Shareholder
Rights Agreement contains provisions to assure that persons with an interest
in the Operating Partnership at the completion of the Offering can maintain
their percentage interest in the Company (assuming exchange of all OP Units
for Common Stock) without becoming an Acquiring Person, the Shareholder Rights
Agreement provides Messrs. Zuckerman and Linde with certain advantages under
the Shareholder Rights Agreement that are not available to other stockholders.
See "Description of Capital Stock--Shareholder Rights Agreement."
 
  Certain provisions of Delaware law could inhibit acquisitions and changes in
control. Certain provisions of the Delaware General Corporation Law (the
"DGCL") also may have the effect of inhibiting a third party from making an
acquisition proposal for the Company or of impeding a change in control of the
Company under circumstances that otherwise could provide the holders of shares
of Common Stock with the opportunity to realize a premium over the then-
prevailing market price of such shares. See "Certain Provisions of Delaware
Law and the Company's Certificate and Bylaws."
 
  Provisions of debt instruments. Certain provisions of agreements relating to
indebtedness on the 599 Lexington Avenue and Bedford Business Park Properties
provide that it is a default thereunder if Messrs. Zuckerman or Linde cease to
serve as a director of the Company or, in the case of 599 Lexington Avenue, to
control the management of such Property.
 
INTEREST RATES, EQUITY MARKET CONDITIONS, AND SHARES AVAILABLE FOR FUTURE SALE
COULD ADVERSELY IMPACT THE TRADING PRICE OF THE COMMON STOCK
 
  Interest rates and trading levels of equity markets could change. One of the
factors that may be expected to influence the prevailing market price of the
Common Stock is the annual yield on the stock price from distributions by the
Company. Accordingly, an increase in market interest rates may lead purchasers
of shares of
 
                                      19
<PAGE>
 
Common Stock in the secondary market to demand a higher annual yield, which
could adversely affect the market price of the Common Stock. In addition, the
market price of the Common Stock could be adversely affected by changes in
general market conditions or fluctuations in the market for equity securities
in general or REIT securities in particular. Moreover, in the future, numerous
other factors, including governmental regulatory actions and proposed or
actual modifications in the tax laws, could have a significant impact on the
market price of the Common Stock.
 
  Availability of shares for future sale could adversely affect the market
price. Sales of substantial amounts of Common Stock (including shares issued
upon the exercise of options), or the perception that such sales could occur,
could adversely affect the prevailing market price for the Common Stock. In
addition, officers of the Company other than Messrs. Zuckerman and Linde own
an aggregate of 1,186,298 OP Units. OP Units may, after August 23, 1998, be
exchanged for cash or, at the option of the Company, for shares of Common
Stock on a one-for-one basis. See "Structure and Formation of the Company--
Formation Transactions" and "Operating Partnership Agreement--Redemption of OP
Units." Messrs. Zuckerman and Linde and the other executive and senior
officers of the Company have agreed, subject to certain limited exceptions,
not to offer, sell, contract to sell or otherwise dispose of any Common Stock
for a period of two years (one year in the case of senior officers who are not
executive officers) from June 23, 1997 without the prior written consent of
Goldman, Sachs & Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated.
At the conclusion of the two year restriction period (or earlier with the
consent of Goldman, Sachs & Co. and Merrill Lynch, Pierce, Fenner & Smith
Incorporated), all shares of Common Stock owned by Messrs. Zuckerman and Linde
and such other individuals, including shares of Common Stock acquired in
exchange for OP Units, may be sold in the public market pursuant to
registration rights or any available exemptions from registration. See "Shares
Available for Future Sale." In addition, after the completion of the Offering,
6,616,880 shares of Common Stock will be reserved for issuance pursuant to the
Company's Stock Option Plan, of which 2,297,600 shares will be subject to
outstanding options. Shares of Common Stock purchased pursuant to options
granted under the Stock Option Plan will generally be available for sale in
the public market. See "Management--Stock Option Plan" and "Shares Available
for Future Sale." No prediction can be made as to the effect of future sales
of Common Stock on the market price of shares of Common Stock.
 
THE COMPANY HAS HAD HISTORICAL ACCOUNTING LOSSES AND HAS A DEFICIT IN OWNERS'
EQUITY; THE COMPANY MAY EXPERIENCE FUTURE LOSSES
 
  After depreciation and amortization, the Company has had historical
accounting losses for certain fiscal years and there can be no assurances that
the Company will not have similar losses in the future. The Boston Properties
Predecessor Group had a net loss of approximately $4.0 million in the
aggregate in 1995 and had cumulative aggregate deficits in owners' equity of
approximately $576.6 million and approximately $506.7 million at December 31,
1996 and 1995, respectively. Net losses reflect the effect of certain non-cash
charges such as depreciation and amortization. The aggregate deficits reflect
the effects of depreciation and amortization described above plus the effects
of distributions in excess of earnings or of mortgage proceeds upon the
refinancing of properties.
 
                                      20
<PAGE>
 
                                  THE COMPANY
 
                                    GENERAL
 
  Boston Properties, Inc. is one of the largest owners and developers of office
properties in the United States, with a significant presence in six submarkets
in Greater Boston, five submarkets in Greater Washington, D.C., two submarkets
in midtown Manhattan, and the downtown submarket of Baltimore, Maryland. The
Company owns 83 Properties, including six Properties under development and one
Property expected to be acquired in January 1998. The Properties aggregate
approximately 16.4 million square feet.
 
  Since the Company's Initial Offering in June 1997, the Company has acquired
three office properties; entered into a contract to acquire a fourth office
property expected to close in January 1998; and is currently developing six
properties, consisting of five office properties aggregating approximately 1.0
million net rentable square feet and one 221 room hotel. The aggregate
anticipated investment for the four acquisition properties is approximately
$872.4 million and the total anticipated investment for the six development
properties is approximately $101.1 million (of which $3.9 million was incurred
prior to the Initial Offering). In addition, the Company has delivered five
office properties that were under development at the time of the Initial
Offering, for a total anticipated investment of approximately $50.8 million (of
which $28.8 million was incurred prior to the Initial Offering). The Company
will use a portion of the proceeds of this Offering to purchase the 900,000 net
rentable square foot Class A Office Building in Richmond, Virginia that is
currently under contract and expected to close in January 1998, fund ongoing
development and repay outstanding balances under the Company's Unsecured Line
of Credit. As of December 1, 1997 the Company had $233.0 million outstanding
under the Unsecured Line of Credit, which amounts had been incurred primarily
to support the Company's acquisition and development activity.
 
  The Company was formed to succeed to the real estate development,
redevelopment, acquisition, management, operating and leasing businesses
associated with the predecessor company founded by Mortimer B. Zuckerman and
Edward H. Linde in 1970. The Company expects to qualify as a REIT for federal
income tax purposes for the year ending December 31, 1997. See "Federal Income
Tax Consequences--Federal Income Taxation of the Company." Following the
completion of this Offering, Messrs. Zuckerman and Linde will beneficially own
in the aggregate a 22.9% economic interest in the Company and the other senior
officers of the Company will beneficially own in the aggregate a 1.7% economic
interest in the Company.
 
  The Company's portfolio consists of 70 Office Properties with approximately
11.8 million net rentable square feet, including five Office Properties
currently under development totaling approximately 1.0 million net rentable
square feet and one Office Property expected to be acquired in January 1998
with approximately 900,000 net rentable square feet, that have approximately
2.5 million square feet of structured parking for 6,913 vehicles; nine
Industrial Properties with approximately 925,000 net rentable square feet;
three hotels, including one limited service extended stay hotel under
development, totaling 1,054 rooms and approximately 940,000 square feet; and a
1,170 space parking garage of approximately 330,000 square feet. The Company
owns a 100% fee interest in 68 of the Properties that account for 99% of the
Company's rental revenues. The Company also owns, has under contract or has
options to acquire six undeveloped parcels of land totaling 39.0 acres, located
primarily in Greater Boston and Greater Washington, D.C., which will support
approximately 629,000 square feet of development.
 
  Over its 27 year history, the Company has developed 83 properties totaling
15.3 million square feet, including properties developed for third parties and
the six properties currently under development. The Company's current portfolio
of 83 properties includes 60 of these Company-developed properties. The Company
believes that it has created significant value in its properties by developing
well located properties that meet the demands of today's office tenants,
redeveloping underperforming assets, and improving the management of under-
managed assets it has acquired.
 
  As of September 30, 1997, the Office Properties (excluding the Office
Development Properties) and the Industrial Properties had an occupancy rate of
96% and the Hotel Properties (excluding the Hotel Development Property) had an
average occupancy rate for the nine month period ended September 30, 1997 of
88%. Leases with respect to 2.5%,of the leased square footage of the Office and
Industrial Properties expire in the fourth quarter of 1997, and 8.0% and 6.8%
expire in calendar years 1998 and 1999, respectively.
 
                                       21
<PAGE>
 
  The Company currently manages all of the Properties except the Hotel
Properties, which are managed by Marriott International, Inc., the Garage
Property, and parking garages that are a part of certain of the Office
Properties. The Company has long-established, full-service offices in Boston,
midtown Manhattan and Washington, D.C. and achieves efficiencies of scale by
operating a centralized financial control and data center at its Boston
headquarters that is responsible for processing of all operating budgets,
billing and payments for all of its completed and development properties. As a
result, the Company believes that it has the capacity to increase the number
of properties it owns and manages with less than a proportional increase in
overhead costs.
 
  The Company believes it has superior access to potential development and
acquisition opportunities by virtue of its long-standing reputation and
relationships, both nationally and in its primary markets, with brokers,
tenants, financial institutions, development agencies, and contractors. The
Company intends to utilize its experience with, and understanding of, the
development and management of a range of commercial property types to
opportunistically pursue developments and acquisitions within its existing and
new markets. The Company's extensive development experience includes suburban
and downtown office buildings, downtown hotels, mixed-use projects, R&D and
research laboratory buildings, suburban office/flex buildings, suburban office
and industrial parks, warehouse and distribution buildings, and special
purpose facilities, as well as both new construction and substantial
renovation for re-use or repositioning. The properties that the Company has
developed have won numerous awards.
 
  The Company believes that the Properties are well positioned to provide a
base for continued growth. The Office and Industrial Properties are leased to
high quality tenants and, in general, are located in submarkets with low
vacancy rates and rising rents and room rates. With the value added by the
Company's in-house marketing, leasing, tenant construction and property
management programs, the Company has historically achieved high occupancy
rates and efficient re-leasing of vacated space.
 
  The Company believes that its capacity for growth will be enhanced by
combining its experienced personnel, established market position and
relationships, hands-on approach to development and management, substantial
portfolio of existing properties and buildings under development, and existing
acquisition opportunities with the advantages that are available to it as a
public company. These advantages include improved access to debt and equity
financing and the ability to acquire properties and sites through the issuance
of stock and OP Units, which can be of particular value to potential tax-
sensitive sellers. The Company also believes that because of its size and
reputation it will be a desirable buyer for those institutions or individuals
wishing to sell individual properties or portfolios of properties in exchange
for an equity position in a public real estate company.
 
  The Company will continue to supplement its revenues, leverage the
experience of its personnel and strengthen its market position by providing
comprehensive, project level development and management services on a
selective basis to private sector companies and government agencies. Between
1989 and September 30, 1997, the Company completed eight third-party
development projects comprising approximately 2.4 million net rentable square
feet. In addition to enhancing revenues without significantly increasing
overhead the Company has achieved significant recognition and experience
through this work, which has led to enhanced opportunities for the Company to
obtain build-to-suit development projects.
 
  The Company has a $300 million unsecured revolving line of credit (the
"Unsecured Line of Credit") led by BankBoston, as agent, that expires in June
2000. The Company uses the Unsecured Line of Credit principally to facilitate
its development and acquisition activities and for working capital purposes.
As of December 1, 1997, the Company had outstanding under the Unsecured Line
of Credit thereunder of $233.0 million, all of which will be repaid upon the
completion of this Offering. As of December 1, 1997, the Company had a debt to
total market capitalization ratio of approximately 41.8%. At the completion of
this Offering and the application of the net proceeds therefrom, the Company
expects to have a debt to total market capitalization ratio of approximately
34.4%. See "Unsecured Line of Credit."
 
  The Company is a full-service real estate company, with substantial in-house
expertise and resources in acquisitions, development, financing, construction
management, property management, marketing, leasing, accounting, tax and legal
services. As of September 30, 1997, the Company had 312 employees, including
94 professionals. The Company's 16 senior officers, together with Mr.
Zuckerman, Chairman of the Board, have an average of 24 years experience in
the real estate industry and an average of 16 years tenure with the Company.
 
                                      22
<PAGE>
 
                                    HISTORY
 
  The Company was founded in Boston, Massachusetts in 1970 by Messrs.
Zuckerman and Linde to acquire and develop first-class commercial real estate
for long-term ownership and management. Over its 27 year history, the Company
has established a successful record of focusing on submarkets where the
Company can achieve leadership positions. The following paragraphs describe
the Company's development and evolution.
 
 Growth in Boston
 
  In the early 1970's, Messrs. Zuckerman and Linde identified the area of
suburban Boston along Route 128 as ready for the development of modern office
buildings, and they selected the quadrant west/northwest of Boston between the
Massachusetts Turnpike and US 93 as the most desirable area in which to
concentrate their efforts. Between 1978 and 1988, the Company acquired 13 key
sites in that area, and completed development of 17 office buildings on those
sites, containing more than 2.0 million net rentable square feet. The Company
also built on its growing reputation for quality development in the Boston
area by successfully competing for control of sites available through public
competitions. In total for Greater Boston, the Company has developed, acquired
or redeveloped, for its own account or for third parties, 42 buildings
containing approximately 5.1 million square feet, of which the Company still
owns approximately 3.8 million square feet.
 
 Expansion to Washington, D.C. and its Suburban Markets
 
  The Company opened its Washington, D.C. regional office in November 1979 to
pursue development and acquisitions and to provide real estate development
services in Greater Washington, D.C., including the Northern Virginia and
suburban Maryland real estate markets. Within this region, the Company has
concentrated its efforts in those submarkets that it believes to be the
strongest, including Southwest Washington, D.C., Montgomery County, Maryland,
Fairfax County, Virginia and Prince George's County, Maryland. During the past
18 years, the Company, for its own account and for third parties, has
developed 34 buildings in Greater Washington, D.C., totaling approximately 6.1
million square feet. The Company continues to own 25 of these properties
consisting of approximately 3.8 million square feet.
 
 Expansion to Midtown Manhattan
 
  In the early 1980's, Messrs. Zuckerman and Linde decided to explore
opportunities to expand the Company's operations to New York City and focused
on midtown Manhattan as desirable for new development. The Company identified
a key block-front site at 599 Lexington Avenue, and based on the Company's
assessment of the strengths of the site and the building design (including
larger floors than were generally available in the market area), proceeded in
1984 with construction of a 1.0 million net rentable square foot office tower.
The building, which the Company still owns, has had an occupancy rate in
excess of 97% for the past seven years. The building has continued to command
premium rents within its submarket.
 
 Response to Market Conditions
 
  In the late 1980's, in response to market conditions, the Company decided
not to undertake any new speculative development or land or property
acquisitions based on its assessment of a growing oversupply and weakening
real estate fundamentals in the markets in which it operated. The Company was
able to continue to prosper by operating the portfolio of properties it had
acquired and developed since 1970, by finding opportunities for build-to-suit
development, and by expanding the scope of its third-party development
management activities. Between 1989 and September 30, 1997, the Company
completed eight third party development projects on a fee basis. The Company
is currently the development manager on projects for, among others, the
National Institutes of Health and Acacia Mutual Life Insurance Company in
Washington, D.C., the United States Postal Service in New York City and Boston
and the Hyatt Development Corporation in Boston.
 
                                      23
<PAGE>
 
                                 RECENT EVENTS
 
  Since the Company's Initial Offering in June 1997, the Company has acquired
three Class A Office Buildings, entered into a contract to acquire a fourth
Class A Office Building expected to close in January 1998, and is developing
five Class A Office Buildings and one 221 room hotel for a total anticipated
investment of approximately $969.6 million. The four properties that the
Company has acquired since the Initial Offering are as follows:
 
                              RECENT ACQUISITIONS
 
<TABLE>
<CAPTION>
                            DATE       NET                                                      ANNUALIZED
                          ACQUIRED/ RENTABLE               ANTICIPATED                           RENT PER
                            TO BE    SQUARE     INITIAL      FUTURE       TOTAL      CURRENT  LEASED SQ. FT.
        PROPERTY          ACQUIRED    FEET     INVESTMENT  INVESTMENT   INVESTMENT  OCCUPANCY AT 9/30/97(/1/)
        --------          --------- --------- ------------ ----------- ------------ --------- ---------------
<S>                       <C>       <C>       <C>          <C>         <C>          <C>       <C>
280 Park Avenue, New
 York, NY...............     9/97   1,198,769 $322,650,000 $28,986,652 $351,636,652     88%       $41.95
100 East Pratt Street,
 Baltimore, MD..........    10/97     633,482  137,516,000         --   137,516,000     97         24.53
875 Third Avenue, New
 York, NY...............    11/97     681,669  206,500,000   2,400,000  208,900,000    100         42.37
Riverfront Plaza,
 Richmond, VA...........     1/98     899,720  174,361,000         --   174,361,000     97         20.16
                                    --------- ------------ ----------- ------------    ---        ------
TOTAL/WEIGHTED AVERAGE..            3,413,640 $841,027,000 $31,386,652 $872,413,652     94%       $33.06
                                    ========= ============ =========== ============    ===        ======
</TABLE>
- --------
(1) At September 30, 1997 total rent abatements with respect to these
    properties, on an annualized basis, were equal to $2.63 per leased square
    foot.
 
  The total acquisition price for these four Properties is approximately
$841.0 million, consisting of $294.0 million in cash (including amounts funded
by borrowings under the Unsecured Line of Credit), $522.0 million in secured
debt (of which $180.0 million is assumed debt), and 890,869 OP Units (valued
at $28 1/16 per OP Unit and subject to certain post-closing adjustments).
 
  280 Park Avenue. This Class A Office Building is located in the Park Avenue
submarket of midtown Manhattan. According to Insignia/ESG, at September 30,
1997, this submarket had an availability rate of 7.6% and an average asking
rent of $46.31 per square foot. The Company anticipates investing
approximately $29.0 million in tenant improvements, leasing commissions and
building system improvements. The Property consists of two linked towers of 30
stories and 42 stories. Principal tenants at this Property include Bankers
Trust Company, Furman Selz LLC and the National Football League.
 
  100 East Pratt Street. This Class A Office Building is located in downtown
Baltimore, Maryland. According to Colliers Pinkard, at June 30, 1997, the
first tier of the downtown Baltimore Class A office market (which includes
this Property) had an availability rate of 8.6% and average asking rents of
$24.83 per square foot. The largest tenant at this Property is T. Rowe Price.
 
  875 Third Avenue. This Class A Office Building is located in the East Side
submarket of midtown Manhattan on Third Avenue between 52nd and 53rd Streets.
According to Insignia/ESG, at September 30, 1997, the East Side submarket had
an availability rate of 12.6% and an average asking rent of $36.95 per square
foot. Principal tenants at this Property include Debevoise & Plimpton and
Instinet Corporation.
 
  Riverfront Plaza. The Company has entered into a purchase and sale agreement
to acquire this Class A Office Building in Richmond, Virginia. According to
Harrison & Bates, at September 30, 1997, the Richmond Class A office market
had an availability rate of 5.0% and an average asking rent of $20.84 per
square foot. Primary tenants at this Property include Hunton & Williams and
Wheat First Butcher Singer, Inc. While the Company anticipates closing on this
acquisition in January 1998, there can be no assurances that the Company will
acquire this property in January 1998, or at all.
 
  The Company regularly pursues the acquisition of income producing properties
and sites for development and may from time to time enter into letters of
intent, contribution agreements and purchase and sale agreements with respect
to the same. The Company is currently a party to three purchase and sale or
contribution agreements with respect to properties and sites located in
Greater Washington D.C. and Greater Boston. One such agreement relates to the
contribution to the Operating Partnership of a series of related properties
with approximately 1.3 million net rentable square feet of office space and
sites that support 920,000 net rentable square feet of
 
                                      24
<PAGE>
 
development. The Company is conducting its due diligence review under all
three agreements and currently has the right to terminate each agreement
without payment of a termination fee to the seller. There can be no assurance
that any such acquisition will be consummated.
 
  Since the Company's Initial Offering, the Company has completed the
development or redevelopment of the following Properties for its own account:
 
          DEVELOPMENT PROPERTIES DELIVERED SINCE THE INITIAL OFFERING
 
<TABLE>
<CAPTION>
                           DATE                               NET
                          PLACED                            RENTABLE ANTICIPATED
                            IN                     NO. OF    SQUARE     TOTAL     CURRENT
        PROPERTY          SERVICE    LOCATION     BUILDINGS   FEET   INVESTMENT+ OCCUPANCY
        --------          ------- --------------- --------- -------- ----------- ---------
<S>                       <C>     <C>             <C>       <C>      <C>         <C>
Sugarland Building One..    6/97      Herndon, VA      1     52,797  $ 5,962,348     82%
Sugarland Building Two..    6/97      Herndon, VA      1     59,423    5,256,692     46
7700 Boston Boulevard,
 Building Twelve........   10/97  Springfield, VA      1     82,224   10,427,128    100
7501 Boston Boulevard,
 Building Seven.........   11/97  Springfield, VA      1     75,756   11,469,620    100
201 Spring Street.......   11/97    Lexington, MA      1    102,000   17,689,442    100
                                                     ---    -------  -----------    ---
TOTAL/WEIGHTED AVERAGE..                               5    372,200  $50,805,230     89%
                                                     ===    =======  ===========    ===
</TABLE>
- --------
+ As of November 30, 1997, the Company had invested $45.2 million, of which
  $28.8 million was invested at or prior to the completion of the Initial
  Offering.
 
  Sugarland Buildings One and Two. These single story office/flex buildings on
extensively landscaped sites are located in the Sugarland Office Complex in
Herndon, Virginia. The Company purchased the buildings vacant in 1996 and
completed improvements to them in June 1997. As of December 1, 1997
approximately 70% of the total of 112,220 net rentable square feet of these
buildings was committed under signed leases or letters of intent with leases
in negotiation.
 
  7700 Boston Boulevard, Building Twelve and 7501 Boston Boulevard, Building
Seven. These R&D Properties are located on land owned by the Company in its
Virginia-95 Office Park and are currently 100% leased to Autometric, Inc. and
the General Services Administration for terms of 15 and 10 years,
respectively.
 
  201 Spring Street. This Class A Office Building is located in the Route 128
Northwest submarket of Greater Boston and is adjacent to the Company's
existing Class A Office Building at 191 Spring Street. The building is
currently 100% leased to MediaOne. MediaOne has notified the Company that it
intends to relocate its headquarters to another state and sublease this
building.
 
                                      25
<PAGE>
 
  The Company is currently developing the following Properties for its own
account:
 
                    PROPERTIES CURRENTLY UNDER DEVELOPMENT
 
<TABLE>
<CAPTION>
                                                                 NET
                                                              RENTABLE  ANTICIPATED
                          ANTICIPATED                NO. OF    SQUARE      TOTAL
 DEVELOPMENT PROPERTIES   COMPLETION    LOCATION    BUILDINGS   FEET    INVESTMENT+
 ----------------------   ----------- ------------- --------- --------- ------------
<S>                       <C>         <C>           <C>       <C>       <C>
Class A Office Buildings
 Reston Overlook (25%
  ownership)............    Q1 1999      Reston, VA      2      440,000  $18,100,000(/1/)
 Eight Cambridge Cen-
  ter...................    Q2 1999   Cambridge, MA      1      134,054   21,000,000
 181 Spring Street......    Q2 1999   Lexington, MA      1       52,000   10,871,085
 One Freedom Square (25%
  ownership)............    Q4 1999      Reston, VA      1      406,980   19,150,000(/1/)
                                                       ---    --------- ------------
 Total Class A Office
  Buildings.............                                 5    1,033,034 $ 69,121,085
Hotel
 Residence Inn by
  Marriott(R)...........    Q1 1999   Cambridge, MA      1      187,474  $32,000,000
                                                       ---      -------  -----------
TOTAL DEVELOPMENT PROP-
 ERTIES.................                                 6    1,220,508 $101,121,085
                                                       ===    ========= ============
</TABLE>
- --------
+ As of November 30, 1997, the Company had invested $6.9 million, of which
  $3.9 million was invested at or prior to the completion of the Initial
  Offering.
(1) Represents 25% of the total anticipated project-level investment.
 
  One and Two Reston Overlook. One Reston Overlook is an approximately 312,000
square foot, 12-story, Class A Office Building located in Reston, Virginia.
The Company is developing this property through its joint venture with
Westbrook. Completion of One Reston Overlook is scheduled for February 1999.
Approximately 309,000 square feet of development is pre-leased to BDM for a
term of twelve years (the building's remaining 3,000 square feet are ground-
floor retail space). The Company is also constructing Two Reston Overlook, a
six-story building on the site totaling approximately 128,000 square feet. Two
Reston Overlook is being developed without a pre-leasing commitment in
response to the significant unsatisfied demand for office space in the Reston,
Virginia market. Delivery of Two Reston Overlook is scheduled for December
1998.
 
  Eight Cambridge Center. This seven-story Class A Office Building is located
in the Cambridge Center development in East Cambridge, Massachusetts.
Completion of this Class A Office Building is scheduled for April 1999.
 
  181 Spring Street. This Class A Office Building is adjacent to the Company's
201 Spring Street Property in the Route 128 Northwest submarket of Greater
Boston. This property is being developed without a pre-leasing commitment in
response to the significant unsatisfied demand for office space in the Route
128 Northwest submarket. Completion of 181 Spring Street is scheduled for May
1999.
 
  One Freedom Square. This Class A Office Building is currently being
developed by the Company in Reston, Virginia. This building is 59.0% pre-
committed to Andersen Consulting. Completion of the building is scheduled for
the fourth quarter of 1999.
 
  Residence Inn by Marriott(R). The Company is currently developing this 221-
room limited service extended stay hotel on land owned by the Company in the
Company's Cambridge Center development. The hotel will be managed by the
Residence Inn division of Marriott International, Inc. and is scheduled to
open in January 1999. As with the Company's other Hotel Properties, the
Company will lease this hotel and will have a participation in the gross
receipts of the hotel.
 
                                      26
<PAGE>
 
                        BUSINESS AND GROWTH STRATEGIES
 
BUSINESS STRATEGY
 
  The Company's primary business objective is to maximize growth in net
available cash for distribution and to enhance the value of its portfolio in
order to maximize total return to stockholders. The Company's strategy to
achieve this objective is: (i) to selectively acquire and develop properties
in the Company's existing markets, adjacent suburban markets and in new
markets that present favorable opportunities; (ii) to maintain high lease
renewal rates at rents that are at the high end of the markets in which the
Properties are located, and to continue to achieve high room rates and
occupancy rates in the Hotel Properties; and (iii) to selectively provide fee-
based development consulting and project management services to third parties.
 
GROWTH STRATEGIES
 
 External Growth
 
  The Company believes that it is well positioned to realize significant
growth through external asset development and acquisition. During its 27 year
history, the Company has developed and acquired 116 properties for itself and
third parties. The Company believes that this development experience and the
Company's organizational depth positions the Company to continue to develop a
range of property types, from single-story suburban properties to high-rise
urban developments, within budget and on schedule. Other factors that
contribute to the Company's competitive position include: (i) the significant
increase in demand for new, high quality office and industrial space in the
Company's core market areas; (ii) the Company's control of sites in its core
markets that will support approximately 629,000 square feet of new development
through fee ownership, contract ownership, and joint venture relationships;
(iii) the Company's reputation gained through the stability and strength of
its existing portfolio of properties; (iv) the Company's relationships with
leading national corporations and public institutions seeking new facilities
and development services; (v) the Company's relationships with nationally
recognized financial institutions that provide capital to the real estate
industry; and (vi) the substantial amount of commercial real estate owned by
domestic and foreign institutions, private investors, and corporations who are
seeking to sell such assets in the Company's market areas.
 
  The Company has targeted four areas of development and acquisition as
significant opportunities to execute the Company's external growth strategy:
 
    Acquire assets and portfolios of assets from institutions or
  individuals. The Company believes that due to its size, management strength
  and reputation it will be in an advantageous position to acquire portfolios
  of assets or individual properties from institutions or individuals. Some
  of these properties may be acquired for cash but the Company believes that
  it is particularly well positioned to appeal to sellers wishing to convert
  on a tax deferred basis their ownership of property to the ownership of
  equity in a diversified real estate operating company that offers liquidity
  through access to the public equity markets. In addition, the Company may
  pursue mergers with and acquisitions of compatible real estate firms. The
  ability to offer OP Units to sellers who would otherwise recognize a gain
  upon a sale of assets for cash or Common Stock may facilitate this type of
  transaction on a tax-efficient basis. The Company is currently in
  discussions with certain institutional investors to acquire certain of
  their portfolio properties, but no assurances can be given that the Company
  will purchase any of such properties.
 
    Acquire existing underperforming assets and portfolios of assets. The
  Company has actively pursued and continues to pursue opportunities to
  acquire existing buildings that, while currently generating income, are
  either underperforming the market due to poor management or are currently
  leased below market with anticipated roll-over of space. These
  opportunities may include the acquisition of entire portfolios of
  properties. The Company believes that because of its in-depth market
  knowledge and development experience in each market in which it currently
  operates, its national reputation with brokers, financial institutions and
  others involved in the real estate market and its access to competitively-
  priced capital, the Company is well-positioned to identify and acquire
  existing, underperforming properties for competitive prices and to add
  significant additional value to such properties through its effective
  marketing strategies and responsive property management program.
 
 
                                      27
<PAGE>
 
    The Company's development capabilities enable the Company to purchase
  properties that have significant redevelopment potential, and to redevelop
  and re-position such properties in the market. Examples of the Company's
  implementation of this strategy include the Company's redevelopment of an
  approximately 163,000 net rentable square foot office building at 191
  Spring Street in Lexington, Massachusetts in 1995. The Company acquired the
  property on a sale and short-term leaseback. When the existing tenant
  vacated, the Company redeveloped the property, adding a new facade,
  elevator and stair tower and creating an atrium, and leased the property in
  its entirety as first-class office space to The Stride Rite Corporation for
  its corporate headquarters.
 
    Another example of the Company's implementation of this strategy was the
  acquisition of the Sugarland Office Park in Herndon, Virginia. After the
  major tenant of this two-building, 112,220 square foot, single story office
  project moved out, the institutional owner decided to sell the property
  rather than undertake a redevelopment or remarketing effort. The property
  was substantially vacant when the Company acquired it in November of 1996.
  As of December 1, 1997, 70% of the available space was committed to new
  tenants.
 
    Similarly, the Company has been successful at acquiring properties that
  have more land available for development. When the Company acquired Bedford
  Business Park in Bedford, Massachusetts, the property had 203,000 square
  feet of buildings. The Company used additional zoning capacity to build an
  additional 270,000 square feet on the site.
 
    Pursue development and land acquisitions in selected submarkets. The
  Company believes that development of well-positioned office buildings and
  R&D properties is currently or will be justified in many of the submarkets
  in which the Company has a presence. The Company believes in acquiring land
  in response to market conditions that allow for the development of such
  land in the relatively near term. Over its 27 year history, the Company has
  established a successful record of carefully timing land acquisitions in
  submarkets where the Company can become one of the market leaders in
  establishing rent and other business terms. The Company believes that there
  are opportunities in its existing and other markets to acquire land with
  development potential at key locations in markets which are experiencing
  growth.
 
    In the past, the Company has been particularly successful at acquiring
  sites or options to purchase sites that need governmental approvals before
  the commencement of development. Because of the Company's development
  expertise, knowledge of the governmental approval process and reputation
  for quality development with local government approval bodies, the Company
  generally has been able to secure the permits necessary to allow
  development, thereby enabling the Company to profit from the increase in
  their value once the necessary permits have been obtained.
 
    In accordance with its belief that future development will provide
  significant growth opportunities, the Company controls several major
  parcels of land in its core submarkets which are positioned for near term
  development. These sites are either (i) owned outright by the Company, (ii)
  subject to options at prices that the Company believes are less than the
  value of the land once developed, or (iii) owned by a third party with whom
  the Company has established a joint venture relationship with respect to
  such site.
 
    The Company has entered into two joint ventures with Westbrook, a major
  investment fund that owns the Mobil Land Corporation national portfolio
  including Reston Town Center, which is currently zoned for the development
  of several office buildings in Reston, Virginia. The Company's first joint
  venture with Westbrook is for the construction of Reston Overlook, a two-
  building, approximately 440,000 net rentable square foot project. BDM has
  committed to lease the first 309,000 square feet and is expected to occupy
  such space in February 1999. The Company's second joint venture with
  Westbrook is for the construction of One Freedom Square, an approximately
  407,000 square foot office building, of which 240,000 square feet are pre-
  committed to Andersen Consulting. The Company expects to complete this
  building in the fourth quarter of 1999. The Company expects that its
  relationship with Westbrook with respect to properties in Reston, Virginia
  will continue, resulting in additional joint venture arrangements. The
  Reston market is one of the most active areas of expansion for the rapidly
  growing Northern Virginia computer technology and telecommunications
  industries. See "Business and Properties--Proposed Developments."
 
    In addition, the Company is pursuing a number of proposed development
  projects.
 
 
                                      28
<PAGE>
 
    The Company believes that, in many cases, land owners with limited
  development expertise and/or limited financial resources wish to align
  their property with an experienced, stable development team who can secure
  financing and lead tenants. The Company has historically been very
  successful at securing lead tenants and favorable financing terms for its
  major projects, and therefore is routinely sought as a joint venture
  partner. Examples of the Company's successful joint ventures with land
  owners include One and Two Independence Square in Southwest Washington,
  D.C., which are the headquarters for the Office of the Comptroller of the
  Currency and the National Aeronautics and Space Administration,
  respectively, and the United States International Trade Commission
  Building, which is the headquarters of the United States International
  Trade Commission.
 
    Provide third-party development management services. While the primary
  objective of the Company has been, and will continue to be, the development
  and acquisition of quality, income producing buildings to be held for long
  term ownership, a select amount of comprehensive project-level development
  management services for third parties will be an element of the continued
  growth and strategy of the Company. The Company believes that third-party
  development projects permit the Company to: (i) create relationships with
  major institutions and corporations that lead to new development
  opportunities; (ii) continue to enhance the Company's reputation in its
  core markets; (iii) create opportunities to enter new markets; and (iv)
  leverage its operating overhead.
 
    The Company's previous third-party development management projects
  include the Thurgood Marshall Federal Judiciary Building in Washington,
  D.C. and the Health Care Financing Administration Building in Woodlawn,
  Maryland, laboratory facilities for Biogen and Beth Israel Hospital in
  Cambridge and Boston, Massachusetts, and the New York Daily News
  headquarters and printing plant in New York City and Jersey City, New
  Jersey, respectively. The high quality of the Company's development
  management projects is evidenced by the numerous awards bestowed upon the
  Federal Judiciary Building, the Health Care Financing Administration
  Building and the New York Daily News headquarters. Current third-party
  development management projects that the Company is engaged in include the
  development of a new $330 million Clinical Research Center for the National
  Institutes of Health, the redevelopment of 90 Church Street in New York
  City for the U.S. Postal Service, and the redevelopment of the Acacia
  Mutual Life Insurance Company building in Washington, D.C. which has been
  leased in its entirety to the law firm of Jones, Day, Reavis & Pogue.
 
 Internal Growth
 
  The Company believes that significant opportunities exist to increase cash
flow from its existing Properties because they are high quality properties in
desirable locations in submarkets that, in general, are experiencing rising
rents, low vacancy rates and increasing demand for office and industrial
space. In addition, the Company's Properties are in markets where, in general,
supply is limited by the lack of available sites and the difficulty of
receiving the necessary approvals for development on vacant land. The
Company's strategy for maximizing the benefits from these opportunities is (i)
to provide high quality property management services using its own employees
in order to enhance tenant preferences for renewal, expansion and relocation
in the Company's properties, and (ii) to achieve speed and transaction cost
efficiency in replacing departing tenants through the use of in-house services
for marketing, lease negotiation, and design and construction of tenant
improvements. In addition, the Company believes that the Hotel Properties will
add to the Company's internal growth because of their desirable locations in
the downtown Boston and East Cambridge submarkets, which are experiencing high
occupancy rates and continued growth in room rates, and their effective
management by Marriott(R), which has achieved high guest satisfaction and
limitations on increases in operating costs.
 
    Cultivate existing submarkets. In choosing locations for its properties,
  the Company has paid particular attention to transportation and commuting
  patterns, physical environment, adjacency to established business centers,
  proximity to sources of business growth and other local factors.
  Substantially all of the Company's square footage of Office Properties are
  located in fourteen submarkets in Greater Boston; Greater Washington, D.C.;
  midtown Manhattan and Baltimore, Maryland.
 
    Many of these submarkets are experiencing increasing rents and as a
  result current market rates often exceed the rents being paid by current
  tenants in the Properties. The Company expects that leases expiring over
  the next three years in these submarkets will be renewed, or space relet,
  at higher rents. Leases with
 
                                      29
<PAGE>
 
  respect to 2.6% of the leased square footage of the Office and Industrial
  Properties expires in the fourth quarter of 1997, and 7.9% and 6.8% expire
  in calendar years 1998 and 1999, respectively. The actual rental rates at
  which available space will be re-let will depend on prevailing market
  factors at the time. There can be no assurance that the Company will re-let
  such space at an increased, or even at the then current, rental rate.
 
    Directly manage properties to maximize the potential for tenant
  retention. The Company itself provides property management services, rather
  than contracting for this service, to achieve awareness of and
  responsiveness to tenant needs. The Company and the Properties also benefit
  from cost efficiencies produced by an experienced work force attentive to
  preventive maintenance and energy management and from the Company's
  continuing programs to assure that its property management personnel at all
  levels remain aware of their important role in tenant relations. The
  Company has long recognized that renewal of existing tenant leases, as
  opposed to tenant replacement, often provides the best operating results,
  because renewals minimize transaction costs associated with marketing,
  leasing and tenant improvements and avoid interruptions in rental income
  during periods of vacancy and renovation of space.
 
    Replace tenants quickly at best available market terms and lowest
  possible transaction costs. The Company believes that it has a competitive
  advantage in attracting new tenants and achieving rental rates at the
  higher end of its markets as a result of its well-located, well-designed
  and well-maintained properties, its reputation for high quality building
  services and responsiveness to tenants, and its ability to offer expansion
  and relocation alternatives within its submarkets. The Company's objective
  throughout this process is to obtain the highest possible rental terms and
  to achieve rent commencement for new tenancies as quickly as possible, and
  the Company believes that its use of in-house resources for marketing,
  leasing and tenant improvements continues to result in lower than average
  transaction costs.
 
                                      30
<PAGE>
 
                                USE OF PROCEEDS
 
  The net proceeds to the Company from the Offering, after deducting the
underwriting discount and estimated expenses of the Offering, are estimated to
be approximately $441.1 million (approximately $507.2 million if the
Underwriters' overallotment option is exercised in full). The net proceeds of
the Offering will be used by the Company to (a) pay down $233.0 million of
indebtedness under the Unsecured Line of Credit, (b) pay $52.6 million in
connection with the acquisition of Riverfront Plaza, (c) fund property
developments currently in process, including $99.8 million that the Company has
committed or budgeted to invest, (d) to fund acquisition opportunities
currently under contract; if a closing thereon is consummated, or other
acquisition opportunities that may arise, and (e) for general corporate and
working capital purposes. The outstanding balance under the Unsecured Line of
Credit, which as of December 1, 1997 bore interest at a rate equal to LIBOR
plus 125 basis points, or 7.125%, was incurred to (i) acquire Newport Office
Park, (ii) acquire 100 East Pratt Street, (iii) repay indebtedness incurred in
connection with development and acquisition activity prior to the Initial
Offering, and (iv) for general corporate purposes.
 
  If the Underwriters' overallotment option is exercised in full, the Company
expects to use the additional net proceeds (which will be approximately $66.1
million) for general corporate purposes.
 
  Pending application of cash proceeds, the Company will invest such portion of
the net proceeds in interest-bearing accounts and short-term, interest-bearing
securities, which are consistent with the Company's intention to qualify for
taxation as a REIT.
 
 
 
                                       31
<PAGE>
 
                PRICE RANGE OF SHARES AND DISTRIBUTION HISTORY
 
  The Company's Common Stock began trading on the New York Stock Exchange on
June 18, 1997, under the symbol "BXP". The following table sets forth the high
and low closing prices per share of the Common Stock on the NYSE for the
periods indicated, as reported by the NYSE. The Initial Offering of the
Company's Common Stock at a price to the public of $25.00 per share was
completed on June 23, 1997.
 
<TABLE>
<CAPTION>
      QUARTER ENDED                                 HIGH   LOW    DISTRIBUTIONS
      -------------                                ------- ---    -------------
      <S>                                          <C>     <C>    <C>
      June 30, 1997 (from June 18, 1997).......... $27 1/4 $25       $0.035(1)
      Third Quarter...............................  33 1/4 26 5/8     0.405(2)
      Fourth Quarter (through December 1, 1997)...  34 3/8  30
</TABLE>
- --------
(1) This dividend with respect to the period from June 23, 1997 through June
    30, 1997 was paid on November 21, 1997, together with the Company's
    dividend for the quarter ended September 30, 1997.
(2) This dividend with respect to the quarter ended September 30, 1997 was
    paid on November 21, 1997.
 
  The Company currently intends to pay regular quarterly dividends to its
stockholders of $0.405 per share of Common Stock, which is equal to an annual
dividend of $1.62 per share. Dividend distributions will be declared at the
discretion of the Board of Directors and will depend on cash flow from
operations of the Company, its financial condition, capital requirements, the
annual distribution requirements under the REIT provisions of the Code and
such other factors as the Board of Directors may deem relevant. The Board of
Directors may modify the Company's dividend policy from time to time. Future
distributions by the Company will be at the discretion of the Board of
Directors and will depend on a number of factors, including the amount of cash
flow and the Operating Partnership's financial condition. Any decision by the
Board of Directors to reinvest the cash flow rather than to distribute such
funds to the Company will depend upon the Operating Partnership's capital
requirements, the annual distribution requirements under the REIT provisions
of the Code (see "Federal Income Tax Consequences--Requirements for
Qualification--Annual Distribution Requirements") and such other factors as
the Board of Directors deems relevant. There can be no assurance that any
distributions will be made or that the estimated level of distributions will
be maintained by the Company.
 
  The Company has determined that the $0.44 per share dividend paid for the
period from June 23, 1997 through the end of the third quarter of 1997
represented ordinary dividend income to its stockholders.
 
  On December 1, 1997 there were 114 holders of record of 38,694,041 shares of
the Company's Common Stock.
 
                                      32
<PAGE>
 
                                CAPITALIZATION
 
  The following table sets forth the capitalization of the Company as of
September 30, 1997, and as adjusted to give effect to the Offering and
application of the net proceeds therefrom as described under "Use of
Proceeds." The information set forth in the table should be read in
conjunction with the combined historical financial statements and notes
thereto, the pro forma financial information and notes thereto and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources" included elsewhere in this
Prospectus.
 
<TABLE>
<CAPTION>
                                                                      AS
                                                       HISTORICAL ADJUSTED(1)
                                                       ---------- -----------
                                                       (DOLLARS IN THOUSANDS)
<S>                                                    <C>        <C>
Debt:
  Mortgage Notes...................................... $  914,614 $1,216,414
  Unsecured Line of Credit............................     71,000        -- (2)
Minority interest in Operating Partnership............     81,168    109,168
Stockholders' equity..................................
  Preferred Stock, $.01 par value, 50,000,000 shares
   authorized, none issued or outstanding.............        --         --
  Common Stock, $.01 par value, 250,000,000 shares
   authorized, 38,693,541 historical and 52,694,041
   pro forma shares issued and outstanding(/1/).......        387        527
  Additional paid-in capital..........................    172,315    613,252
  Retained earnings...................................     22,779     22,779
                                                       ---------- ----------
    Total capitalization.............................. $1,262,263 $1,962,140
                                                       ========== ==========
</TABLE>
- --------
(1) Does not include 2,297,606 shares of Common Stock subject to options
    granted under the Company's Stock Option Plan. Does not include 16,957,328
    OP Units; after August 23, 1998 or such later date as an OP Unit holder
    may agree, OP Units are redeemable for cash or, at the election of the
    Company, shares of Common Stock on a one-for-one basis.
(2) Reflects the net effect of the historical balance as adjusted for
    drawdowns subsequent to September 30, 1997 of (i) approximately $137,500
    to pay for the acquisition of 100 East Pratt Street and (ii) approximately
    $24,500 to fund on going developments and for general corporate purposes,
    less the approximately $233,000 balance of the Unsecured Line of Credit to
    be repaid from the anticipated use of proceeds.
 
                                      33
<PAGE>
 
                        SELECTED FINANCIAL INFORMATION
 
  The following table sets forth unaudited pro forma financial and other
information for the Company and combined historical financial information for
the Boston Properties Predecessor Group. The following selected financial
information should be read in conjunction with the financial statements and
notes thereto included elsewhere in this Prospectus.
 
  The combined historical balance sheets as of December 31, 1996 and 1995 and
combined historical statements of operations for the years ended December 31,
1996, 1995 and 1994 of the Boston Properties Predecessor Group have been
derived from the historical combined financial statements audited by Coopers &
Lybrand L.L.P., independent accountants, whose report with respect thereto is
included elsewhere in this Prospectus.
 
  The selected financial data at and for the nine months ended September 30,
1997 (which includes the Company and the Boston Properties Predecessor Group)
and for the nine months ended September 30, 1996 are derived from unaudited
financial statements. The unaudited financial information includes all
adjustments (consisting of normal recurring adjustments) that management
considers necessary for fair presentation of the combined financial position
and results of operations for these periods. Combined operating results for
the nine months ended September 30, 1997 are not necessarily indicative of the
results to be expected for the entire year ended December 31, 1997.
 
  Unaudited pro forma adjustments and operating information for the nine
months ended September 30, 1997 and the year ended December 31, 1996 is
presented as if the completion of the Initial Offering and the Formation
Transactions, the Offering, and the properties acquired and pending
acquisitions subsequent to September 30, 1997 and the acquisitions subsequent
to December 31, 1996, had occurred at January 1, 1996, and the effect thereof
was carried forward through the nine months ended September 30, 1997. By
necessity, such pro forma operating information incorporates certain
assumptions which are described in the notes to the Pro Forma Condensed
Consolidated Statements of Operations included elsewhere in this Prospectus.
The unaudited pro forma balance sheet data is presented as if the
aforementioned transactions had occurred on September 30, 1997.
 
  The pro forma information does not purport to represent what the Company's
financial position or results of operations would actually have been if these
transactions had, in fact, occurred on such date or at the beginning of the
period indicated, or to project the Company's financial position or results of
operations at any future date or for any future period.
 
                                      34
<PAGE>
 
            THE COMPANY AND THE BOSTON PROPERTIES PREDECESSOR GROUP
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<TABLE>
<CAPTION>
                            THE COMPANY           THE PREDECESSOR GROUP   THE COMPANY
                    --------------------------- ------------------------- ------------
                                                HISTORICAL
                                  ---------------------------------------
                      PRO FORMA
                     NINE MONTHS    JUNE 23,    JANUARY 1,   NINE MONTHS   PRO FORMA
                        ENDED        1997 TO      1997 TO       ENDED      YEAR ENDED
                    SEPTEMBER 30, SEPTEMBER 30,  JUNE 22,   SEPTEMBER 30, DECEMBER 31,
                        1997          1997         1997         1996          1996
                    ------------- ------------- ----------- ------------- ------------
                     (UNAUDITED)   (UNAUDITED)  (UNAUDITED)  (UNAUDITED)  (UNAUDITED)
<S>                 <C>           <C>           <C>         <C>           <C>
OPERATING DATA:
Revenues:
 Rental reve-
  nue (1)........    $  246,226    $   64,253    $ 93,802     $147,391      $316,682
 Hotel reve-
  nue (1)........           --            --       31,185       47,458           --
 Fee and other
  income.........         6,927         4,100       4,831        7,470         7,608
                     ----------    ----------    --------     --------      --------
 Total revenues..       253,153        68,353     129,818      202,319       324,290
Expenses:
 Property ex-
  penses.........        78,135        17,893      27,032       43,728       104,043
 Hotel ex-
  penses (1).....           --            --       22,452       32,359           --
 General and ad-
  ministrative...         9,096         3,164       5,116        8,149        11,888
 Interest........        69,916        16,091      53,324       82,627        94,929
 Depreciation and
  amortization...        37,435        10,113      17,054       27,008        50,502
                     ----------    ----------    --------     --------      --------
 Total expenses..       194,582        47,261     124,978      193,871       261,362
Income (loss)
 before minority
 interest in
 combined
 partnership.....        58,571        21,092       4,840        8,448        62,928
Minority interest
 in combined
 partnership.....          (304)          (69)       (235)        (288)         (384)
                     ----------    ----------    --------     --------      --------
Income (loss)
 before minority
 interest in
 operating
 partnership.....        58,267        21,023       4,605        8,160        62,544
Minority interest
 in Operating
 Partnership.....       (14,188)       (6,169)        --           --        (15,229)
                     ----------    ----------    --------     --------      --------
Income (loss)
 before
 extraordinary
 items...........    $   44,079        14,854       4,605        8,160      $ 47,315
                     ==========                                             ========
Extraordinary
 gains (loss) on
 early debt
 extinguishments,
 net of minority
 interest........           --          7,925         --           --            --
                                   ----------    --------     --------
Net income
 (loss)..........           --     $   22,779    $  4,605     $  8,160           --
                                   ==========    ========     ========
Per Share of
 Common Stock
 Data:
Income before ex-
 traordinary
 items...........    $      .84    $      .38         --           --       $    .90
Net income.......           --            .59         --           --            --
Weighted average
 number of shares
 outstanding.....        52,694        38,694         --           --         52,694
Weighted average
 number of shares
 and OP Units
 outstanding.....        69,651        54,760         --           --         69,651
BALANCE SHEET
 DATA, AT PERIOD
 END:
Real estate,
 before
 accumulated
 depreciation....    $1,954,753    $1,433,376         --           --            --
Real estate,
 after
 accumulated
 depreciation....     1,669,248     1,147,871         --           --            --
Cash and cash
 equivalents.....       201,631        25,989         --           --            --
Total assets.....     1,995,515     1,295,638         --           --            --
Total indebted-
 ness............     1,216,414       985,614         --           --            --
Stockholders' or
 owners' equity
 (deficiency)....       636,558       195,481         --           --            --
OTHER DATA:
Funds from
 Operations (2)
 (unaudited).....    $   95,236    $   30,879    $ 21,450     $ 34,652      $104,892
Company's Funds
 from Operations
 (unaudited).....        72,045        21,818         --           --         79,351
EBITDA (3) (unau-
 dited)..........       165,352        47,106      74,838      117,525       207,675
Company's
 EBITDA(unaudited)
 ................       125,087        33,284         --           --        157,106
Cash flow
 provided by
 operating
 activities (4)
 ................           --     $   25,930    $ 25,226     $ 31,109           --
Cash flow used in
 investing
 activities (4)
 ................           --       (356,794)    (32,844)     (42,952)          --
Cash flow
 provided by
 (used in)
 financing
 activities (4)..           --        356,853       9,130       (1,555)          --
<CAPTION>
                                    THE PREDECESSOR GROUP
                    -----------------------------------------------------------
                                          HISTORICAL
                                   YEAR ENDED DECEMBER 31,
                    -----------------------------------------------------------
                       1996        1995        1994        1993        1992
                    ----------- ----------- ----------- ----------- -----------
<S>                 <C>         <C>         <C>         <C>         <C>
OPERATING DATA:
Revenues:
 Rental reve-
  nue (1)........   $  195,006  $  179,265  $  176,725  $  182,776  $  177,370
 Hotel reve-
  nue (1)........       65,678      61,320      58,436      54,788      52,682
 Fee and other
  income.........        9,249       8,140       8,922       7,997      11,160
                    ----------- ----------- ----------- ----------- -----------
 Total revenues..      269,933     248,725     244,083     245,561     241,212
Expenses:
 Property ex-
  penses.........       58,195      55,421      53,239      54,766      49,621
 Hotel ex-
  penses (1).....       46,734      44,018      42,753      40,286      38,957
 General and ad-
  ministrative...       10,754      10,372      10,123       9,549       9,331
 Interest........      109,394     108,793      97,273      90,335      91,889
 Depreciation and
  amortization...       36,199      33,828      33,112      33,148      35,030
                    ----------- ----------- ----------- ----------- -----------
 Total expenses..      261,276     252,432     236,500     228,084     224,828
Income (loss)
 before minority
 interest in
 combined
 partnership.....        8,657      (3,707)      7,583      17,477      16,384
Minority interest
 in combined
 partnership.....         (384)       (276)       (412)       (391)       (374)
                    ----------- ----------- ----------- ----------- -----------
Income (loss)
 before minority
 interest in
 operating
 partnership.....        8,273      (3,983)      7,171      17,086      16,010
Minority interest
 in Operating
 Partnership.....          --          --          --          --          --
                    ----------- ----------- ----------- ----------- -----------
Income (loss)
 before
 extraordinary
 items...........        8,273      (3,983)      7,171      17,086      16,010
Extraordinary
 gains (loss) on
 early debt
 extinguishments,
 net of minority
 interest........         (994)        --          --          --          --
                    ----------- ----------- ----------- ----------- -----------
Net income
 (loss)..........   $    7,279  $   (3,983) $    7,171  $   17,086  $   16,010
                    =========== =========== =========== =========== ===========
Per Share of
 Common Stock
 Data:
Income before ex-
 traordinary
 items...........          --          --          --          --          --
Net income.......          --          --          --          --          --
Weighted average
 number of shares
 outstanding.....          --          --          --          --          --
Weighted average
 number of shares
 and OP Units
 outstanding.....          --          --          --          --          --
BALANCE SHEET
 DATA, AT PERIOD
 END:
Real estate,
 before
 accumulated
 depreciation....   $1,035,571  $1,012,324  $  984,853  $  983,751  $  982,348
Real estate,
 after
 accumulated
 depreciation....      771,660     773,810     770,763     789,234     811,815
Cash and cash
 equivalents.....        8,998      25,867      46,289      50,697      28,841
Total assets.....      896,511     922,786     940,155     961,715     971,648
Total indebted-
 ness............    1,442,476   1,401,408   1,413,331   1,426,882   1,417,940
Stockholders' or
 owners' equity
 (deficiency)....     (576,632)   (506,653)   (502,230)   (495,104)   (480,398)
OTHER DATA:
Funds from
 Operations (2)
 (unaudited).....   $   36,318  $   29,151  $   39,568  $   49,240  $   50,097
Company's Funds
 from Operations
 (unaudited).....          --          --          --          --          --
EBITDA (3) (unau-
 dited)..........      153,566     138,321     137,269     140,261     142,627
Company's
 EBITDA(unaudited)
 ................          --          --          --          --          --
Cash flow
 provided by
 operating
 activities (4)
 ................   $   51,531  $   29,092  $   45,624  $   59,834  $   50,468
Cash flow used in
 investing
 activities (4)
 ................      (23,689)    (36,844)    (18,424)     (9,437)    (48,257)
Cash flow
 provided by
 (used in)
 financing
 activities (4)..      (44,711)    (12,670)    (31,608)    (28,540)      1,365
</TABLE>
 
                                       35
<PAGE>
 
- -------
(1) Pro forma revenue for the nine month period ended September 30, 1997 and
    the year ended December 31, 1996 includes the lease revenue that the
    Company has/will receive under the lease for the two Hotel Properties.
    After entering into such lease, the Company has not/will not recognize
    direct hotel revenues and expenses.
(2) 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. The Company 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 the Company to incur and service debt, to
    make capital expenditures and to fund other cash needs. The Company
    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
    differently than the Company. Funds from Operations does not represent
    cash generated from operating activities determined in accordance with
    GAAP and should not be considered as an alternative to net income
    (determined in accordance with GAAP) as an indication of the Company's
    financial performance or to cash flow from operating activities
    (determined in accordance with GAAP) as a measure of the Company's
    liquidity, nor is it indicative of funds available to fund the Company's
    cash needs, including its ability to make cash distributions.
The following is a reconciliation of net income to Funds from Operations:
<TABLE>
<CAPTION>
                           THE COMPANY           THE PREDECESSOR GROUP   THE COMPANY           THE PREDECESSOR GROUP
                   --------------------------- ------------------------- ------------ -------------------------------------------
                                               HISTORICAL
                     PRO FORMA   ---------------------------------------
                    NINE MONTHS    JUNE 23,    JANUARY 1,   NINE MONTHS   PRO FORMA                 HISTORICAL
                       ENDED        1997 TO      1997 TO       ENDED      YEAR ENDED          YEAR ENDED DECEMBER 31,
                   SEPTEMBER 30, SEPTEMBER 30,  JUNE 22,   SEPTEMBER 30, DECEMBER 31, -------------------------------------------
                       1997          1997         1997         1996          1996      1996     1995     1994     1993     1992
                   ------------- ------------- ----------- ------------- ------------ -------  -------  -------  -------  -------
                    (UNAUDITED)   (UNAUDITED)  (UNAUDITED)  (UNAUDITED)  (UNAUDITED)
                                                         (DOLLARS IN THOUSANDS)
<S>                <C>           <C>           <C>         <C>           <C>          <C>      <C>      <C>      <C>      <C>
FUNDS FROM OPERA-
 TIONS
Income (loss)
 before minority
 interest and
 extraordinary
 item............     $58,571       $21,092      $ 4,840      $ 8,448      $ 62,928   $ 8,657  $(3,707) $ 7,583  $17,477  $16,384
Add:
  Real estate
   depreciation
   and
   amortization..      37,050         9,974       16,808       26,590        49,946    35,643   33,240   32,509   32,300   34,221
Less:
  Minority
   combined
   partnership's
   share of Funds
   from
   Operations....        (385)         (187)        (198)        (386)         (479)     (479)    (382)    (524)    (537)    (508)
  Non-recurring
   item--
   significant
   lease
   termination
   fee...........         --            --           --           --         (7,503)   (7,503)     --       --       --       --
                      -------       -------      -------      -------      --------   -------  -------  -------  -------  -------
Funds from
 Operations
 (unaudited).....     $95,236       $30,879      $21,450      $34,652      $104,892   $36,318  $29,151  $39,568  $49,240  $50,097
                      =======       =======      =======      =======      ========   =======  =======  =======  =======  =======
</TABLE>
- -------
(3) EBITDA means operating income before mortgage and other interest, income
    taxes, depreciation and amortization. The Company believes EBITDA is
    useful to investors as an indicator of the Company's ability to service
    debt or pay cash distributions. EBITDA, as calculated by the Company, is
    not comparable to EBITDA reported by other REITs that do not define EBITDA
    exactly as the Company defines that term. EBITDA should not be considered
    as an alternative to operating income or net income (determined in
    accordance with GAAP) as an indicator of operating performance or as an
    alternative to cash flows from operating activities (determined in
    accordance with GAAP) as an indicator of liquidity and other combined or
    consolidated income or cash flow statement data (determined in accordance
    with GAAP). EBITDA for the respective periods is calculated as follows:
 
<TABLE>
<CAPTION>
                           THE COMPANY           THE PREDECESSOR GROUP   THE COMPANY 
                   --------------------------- ------------------------- ------------
                                               HISTORICAL                            
                     PRO FORMA   ---------------------------------------             
                    NINE MONTHS    JUNE 23,    JANUARY 1,   NINE MONTHS   PRO FORMA  
                       ENDED        1997 TO      1997 TO       ENDED      YEAR ENDED 
                   SEPTEMBER 30, SEPTEMBER 30,  JUNE 22,   SEPTEMBER 30, DECEMBER 31,
                       1997          1997         1997         1996          1996    
                   ------------- ------------- ----------- ------------- ------------
                    (UNAUDITED)   (UNAUDITED)  (UNAUDITED)  (UNAUDITED)  (UNAUDITED) 
                                                           (DOLLARS IN THOUSANDS)    
<S>                <C>           <C>           <C>         <C>           <C>         
EBITDA                                                                               
Income (loss)                                                                        
 before minority                                                                     
 interest and                                                                        
 extraordinary                                                                       
 item.............   $ 58,571       $21,092      $ 4,840     $  8,448      $ 62,928  
Add:                                                                                 
  Interest                                                                           
   expense........     69,916        16,091       53,324       82,627        94,929  
  Real estate                                                                        
   depreciation                                                                      
   and                                                                               
   amortization...     37,050         9,974       16,808       26,590        49,946  
  Other                                                                              
   depreciation...        385           139          246          418           556  
Less:                                                                                
  Minority                                                                           
   combined                                                                          
   partnership's                                                                     
   share of                                                                          
   EBITDA.........       (570)         (190)        (380)        (558)         (684) 
                     --------       -------      -------     --------      --------  
EBITDA                                                                               
 (unaudited)......   $165,352       $47,106      $74,838     $117,525      $207,675  
                     ========       =======      =======     ========      ========  
</TABLE>

<TABLE>
<CAPTION>
                              THE PREDECESSOR GROUP
                   ------------------------------------------------
                  
                  
                                    HISTORICAL
                             YEAR ENDED DECEMBER 31,
                   ------------------------------------------------
                     1996      1995      1994      1993      1992
                   --------  --------  --------  --------  --------
                  
                  
<S>                <C>       <C>       <C>       <C>       <C>
EBITDA            
Income (loss)     
 before minority  
 interest and     
 extraordinary    
 item............. $  8,657  $ (3,707) $  7,583  $ 17,477  $ 16,384
Add:              
  Interest        
   expense........  109,394   108,793    97,273    90,335    91,889
  Real estate     
   depreciation   
   and            
   amortization...   35,643    33,240    32,509    32,300    34,221
  Other           
   depreciation...      556       588       603       848       809
Less:             
  Minority        
   combined       
   partnership's  
   share of       
   EBITDA.........     (684)     (593)     (699)     (699)     (676)
                   --------  --------  --------  --------  --------
EBITDA            
 (unaudited)...... $153,566  $138,321  $137,269  $140,261  $142,627
                   ========  ========  ========  ========  ========
</TABLE>

(4) Pro forma information relating to cash flow from operating, investing and
    financing activities has not been included because the Company believes
    that the information would not be meaningful due to the number of
    assumptions required in order to calculate this information.
 
                                      36
<PAGE>
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
  The following discussion is based primarily on the consolidated financial
statements of the Company for the period subsequent to formation of the
Company and on the combined financial statements of the Boston Properties
Predecessor Group for the periods prior to the Formation Transactions.
 
  The following discussion should be read in conjunction with the "Selected
Financial Information" and the historical and pro forma financial statements
and notes thereto appearing elsewhere in this Prospectus. The pro forma
financial position is presented as if the Offering and the acquisitions
subsequent to September 30, 1997 had occurred on September 30, 1997. The pro
forma results of operations is presented as if the Initial Offering, the
Formation Transactions, the Offering and the acquisitions subsequent to
December 31, 1996 had occurred on January 1, 1996. See "Structure and
Formation of the Company--Formation Transactions" and the Notes to the pro
forma financial statements of the Company. The combined financial statements
of the Boston Properties Predecessor Group consist of 60 of the Office
Properties that were owned as of that date (including five Office Properties
under development during 1996), nine Industrial Properties, two Hotel
Properties and the Garage Property.
 
                             RESULTS OF OPERATIONS
 
COMPARISON OF THE NINE MONTHS ENDED SEPTEMBER 30, 1997 TO THE NINE MONTHS
ENDED SEPTEMBER 30, 1996.
 
  For discussion purposes, the results of operations for the nine months ended
September 30, 1997 combine the operating results of the Boston Properties
Predecessor Group for the period January 1, 1997 to June 22, 1997 and the
operating results of the Company for the period June 23, 1997 to September 30,
1997. The results of operations for the nine months ended September 30, 1996
represent solely the operating results of the Boston Properties Predecessor
Group. Consequently, the comparison of the periods provides only limited
information regarding the operations of the Company.
 
  Rental revenue increased $10.7 million or 7.3% to $158.1 million from $147.4
million for the nine months ended September 30, 1997 compared to the nine
months ended September 30, 1996. Rental revenue for the nine months ended
September 30, 1997 includes rental revenue from the hotel leases for the
eight-day period June 23, 1997 to June 30, 1997 and the three months ended
September 30, 1997 as well as rental revenue from the properties acquired
during 1997.
 
  Hotel operating revenue decreased $16.3 million or 34.3% to $31.2 million
from $47.5 million for the nine months ended September 30, 1997 compared to
the nine months ended September 30, 1996. Hotel operating revenue for the nine
months ended September 30, 1997 only includes revenue from January 1, 1997 to
June 22, 1997 as a result of the Operating Partnership entering into a
participating lease with ZL Hotel LLC at the time of the Initial Offering.
 
  Third party management and development fee income increased $1.0 million or
20.4% to $5.9 million from $4.9 million for the nine months ended September
30, 1997 compared to the nine months ended September 30, 1996 as a result of
increased fees on existing projects as well as additional projects.
 
  Interest income and other increased $0.4 million or 16.7% to $3.0 million
from $2.6 million for the nine months ended September 30, 1997 compared to the
nine months ended September 30, 1996, primarily due to increasing average cash
balances.
 
  Property expenses increased $1.2 million or 2.7% to $44.9 million from $43.7
million for the nine months ended September 30, 1997 compared to the nine
months ended September 30, 1996 primarily as a result of real estate
acquisitions.
 
  Hotel operating expenses decreased $10.0 million or 30.9% to $22.4 million
from $32.4 million for the nine months ended September 30, 1997 compared to
the nine months ended September 30, 1996. Hotel expenses for the nine months
ended September 30, 1997 only includes expenses from January 1, 1997 to June
22, 1997.
 
                                      37
<PAGE>
 
  General and administrative expenses increased $0.1 million or 1.6% to $8.3
million from $8.2 million for the nine months ended September 30, 1997
compared to the nine months ended September 30, 1996.
 
  Interest expense decreased $13.2 million or 16.0% to $69.4 million from
$82.6 million for the nine months ended September 30, 1997 compared to the
nine months ended September 30, 1996. An increase in interest expense due to
increased indebtedness for the period January 1, 1997 to June 22, 1997 was
offset by a reduction in interest expense for the eight-day period June 23,
1997 to June 30, 1997 and the three months ended September 30, 1997 as a
result of the payoff of approximately $707 million of mortgage indebtedness.
 
  Depreciation and amortization expense increased $0.2 million or 0.7% to
$27.2 million from $27.0 million for the nine months ended September 30, 1997
compared to the nine months ended September 30, 1996.
 
  As a result of the foregoing, net income before minority interests and
extraordinary items increased $17.7 million to $25.9 million from $8.2 million
for the nine months ended September 30, 1997 compared to the nine months ended
September 30, 1996.
 
COMPARISON OF YEAR ENDED DECEMBER 31, 1996 TO YEAR ENDED DECEMBER 31, 1995.
 
  Rental revenue increased $15.7 million or 8.8% to $195.0 million from $179.3
million for the year ended December 31, 1996 compared to the year ended
December 31, 1995 primarily as a result of (i) a $7.5 million lease
termination fee received from a tenant at 599 Lexington Avenue for which the
space was immediately released, (ii) an increase of $2.8 million due to the
completion of the redevelopment and leasing of 191 Spring Street and (iii) an
overall increase in occupancy and rental rates.
 
  Hotel revenue increased $4.4 million or 7.1% to $65.7 million from $61.3
million for the year ended December 31, 1996 compared to the year ended
December 31, 1995 primarily as a result of an increase in average daily room
rates of 7.6%.
 
  Third-party management and development fee income increased $1.3 million or
29.5% to $5.7 million from $4.4 million for the year ended December 31, 1996
compared to the year ended December 31, 1995 primarily as a result of new fees
for development services for projects which began during 1996.
 
  Interest and other income decreased $0.2 million or 4.5% to $3.5 million
from $3.7 million primarily due to a reduction in interest income resulting
from a reduction in cash reserves.
 
  Property expenses increased $2.8 million or 5.0% to $58.2 million from $55.4
million for the year ended December 31, 1996 compared to the year ended
December 31, 1995 primarily as a result of a $1.1 million increase in utility
costs which was partially due to the increase in occupancy of the properties
during 1996 and an increase of $0.1 million in real estate taxes.
 
  Hotel expenses increased $2.7 million or 6.2% to $46.7 million from $44.0
million for the year ended December 31, 1996 compared to the year ended
December 31, 1995.
 
  General and administrative expense increased $0.4 million, or 3.7% to $10.8
million from $10.4 million for the year ended December 31, 1996 compared to
the year ended December 31, 1995.
 
  Interest expense increased $0.6 million or 0.6% to $109.4 million from
$108.8 million for the year ended December 31, 1996 compared to the year ended
December 31, 1995 primarily as the result of an increase in interest expense
of 191 Spring Street resulting from the capitalization of interest during the
redevelopment of that property during 1995, an increase in total indebtedness
from new loans on Bedford Business Park and Capital Gallery, partially offset
by decreases in interest rates on variable rate loans.
 
  Depreciation and amortization expense increased $2.4 million or 7.1% to
$36.2 million from $33.8 million for the year ended December 31, 1996 compared
to the year ended December 31, 1995 as a result of increased tenant
improvement costs incurred during the successful leasing of available space
during 1995 and 1996.
 
 
                                      38
<PAGE>
 
  As a result of the foregoing, net income before extraordinary item and
minority interest in combined partnership increased $12.4 million to $8.7
million from a loss of $3.7 million for the year ended December 31, 1996
compared to the year ended December 31, 1995.
 
COMPARISON OF YEAR ENDED DECEMBER 31, 1995 TO YEAR ENDED DECEMBER 31, 1994.
 
  Rental revenue increased $2.5 million or 1.4% to $179.3 million from $176.7
million for the year ended December 31, 1995 compared to the year ended
December 31, 1994 as a result of increases in occupancy, including an increase
of $2.3 million from releasing at Democracy Center partially offset by a loss
of revenue of $2.7 million from 191 Spring Street which was taken out of
service for eleven months of 1995 while undergoing a complete redevelopment.
 
  Hotel revenue increased $2.9 million or 4.9% to $61.3 million from $58.4
million for the year ended December 31, 1995 compared to the year ended
December 31, 1994 primarily as a result of an increase in the average daily
room rate of 7.7%.
 
  Third-party management and development fee revenue decreased $1.6 million or
27.0% to $4.4 million from $6.0 million primarily as the result of a decline
in revenue from projects completed in 1994.
 
  Interest and other income increased $864,000 or 30.9% to $3.7 million from
$2.8 million for the year ended December 31, 1995 compared to the year ended
December 31, 1994 primarily as a result of an increase in interest income from
cash investments.
 
  Property expenses increased $2.2 million or 4.1% to $55.4 million from $53.2
million for the year ended December 31, 1995 compared to the year ended
December 31, 1994 primarily as a result of increased utilities and building
cleaning and maintenance costs.
 
  Hotel expenses increased $1.3 million or 3.0% to $44.0 million from $42.8
million for the year ended December 31, 1995 compared to the year ended
December 31, 1994.
 
  General and administrative expense increased $249,000 or 2.5% to $10.4
million from $10.1 million for the year ended December 31, 1995 compared to
the year ended December 31, 1994.
 
  Interest expense increased $11.6 million or 12.2% to $107.0 million from
$95.3 million for the year ended December 31, 1995 compared to the year ended
December 31, 1994 as a result of increases in interest rates on variable rate
mortgage loans partially offset by a reduction in indebtedness resulting from
scheduled payments of mortgage loan principal and the capitalization of
interest of the 191 Spring Street loan during the redevelopment of that
property in 1995.
 
  Depreciation and amortization expense increased $615,000 or 1.8% to $35.7
million from $35.1 million for the year ended December 31, 1995 compared to
the year ended December 31, 1994.
 
  As a result of the foregoing, net income before extraordinary item and
minority interest in combined partnership decreased $11.3 million to a loss of
$3.7 million from $7.6 million of net income for the year ended December 31,
1995 compared to the year ended December 31, 1994.
 
                          PRO FORMA OPERATING RESULTS
 
  Nine Months Ended September 30, 1997. For the nine months ended September
30, 1997, pro forma net income before extraordinary item would have been $44.1
million compared to $19.5 million of historical net income for the nine months
ended September 30, 1997. The pro forma operating results for the nine months
ended September 30, 1997 include a minority interest in Operating Partnership
of $14.2 million for the nine months ended September 30, 1997, whereas there
was no minority interest in Operating Partnership for the nine months ended
September 30, 1996. On a pro forma basis, net income before minority interest
for the nine months ended September 30, 1997 would have been $58.3 million
compared to $25.6 million of net income before extraordinary items for the
nine months ended September 30, 1997. Income before minority interest in
Operating Partnership and extraordinary item increased by $28.9 million on a
pro forma basis for the nine months ended September 30, 1997 primarily due to
a reduction of interest expense and income earned on the 1997 acquisitions and
pending acquisitions.
 
                                      39
<PAGE>
 
  Pro forma rental revenue for 1996 and the nine months ended September 30,
1997 includes lease revenue from the Hotel and Garage Properties whereas the
historical financial statements include revenues and expenses on a gross basis
on the respective line items for the Hotel and Garage properties.
 
  Upon completion of the Initial Offering, certain management fee contracts
were assigned to the Development and Management Company, which entity, on a
pro forma basis, has been accounted for under the equity method. Revenue and
expenses from these contracts are included on a gross basis in the historical
financial statements in their respective line items.
 
  Year Ended December 31, 1996. For the year ended December 31, 1996, pro
forma net income before minority interest in Operating Partnership and
extraordinary item would have been $62.5 million compared to $8.3 million of
historical net income for the year ended December 31, 1996. The pro forma
operating results for the year ended December 31, 1996 include a minority
interest in Operating Partnership of $15.2 million whereas there was no
minority interest in Operating Partnership in the corresponding historical
period. On a pro forma basis, net income before extraordinary item for the
year ended December 31, 1996 would have been $47.3 million compared to $8.3
million of net income before extraordinary items for the corresponding
historical period. Income before minority interest in Operating Partnership
and extraordinary item increased by $39.0 million on a pro forma basis for the
year ended December 31, 1996 primarily due to a reduction of interest expense.
 
  Pro Forma rental revenue for the nine months ended September 30, 1997 and
for the year ended December 31, 1996 includes the lease revenues that the
Company will receive from ZL Hotel LLC under the lease for the two Hotel
Properties. After entering into such lease, the Company will not recognize
hotel revenues and expenses.
 
  The development and management operations of the Company are reflected on a
gross basis in the historical combined financial statements. In connection
with the Formation Transactions, a portion of the Greater Washington, D.C.
third-party property management business was contributed by the Company to the
Development and Management Company and thereafter the operations of the
Development and Management Company were accounted for by the Company under the
equity method in the pro forma statements; therefore, the pro forma statements
include (i) revenues and expenses on a gross basis from development and
management conducted directly by the Operating Partnership in the respective
income and expense line items and (ii) the Development and Management
Company's net operations in the fee and other income line item. See "Business
and Properties--Development Consulting and Third-Party Property Management."
 
                        LIQUIDITY AND CAPITAL RESOURCES
 
  Upon completion of the Offering and the application of the net proceeds
therefrom as described in "Use of Proceeds," the Company expects to have
reduced its total indebtedness from $1.4 billion to $1.2 billion, all of which
debt is secured by Properties (the "Mortgage Debt"). The $1.2 billion Mortgage
Debt is comprised of 15 loans secured by 18 properties, with a weighted
average interest rate of 7.45% on the fixed rate portion. Approximately 1.0%
of the Mortgage Debt ($11.6 million) is floating rate. There will be a total
of $11.1 million of scheduled loan principal payments due during the year
ending December 31, 1998. At the completion of the Offering, the Company's
debt to market capitalization ratio will be 34.4%. (33.8% if the underwriters'
overallotment is exercised in full).
 
                                      40
<PAGE>
 
  Mortgage Indebtedness. As of December 1, 1997, the Company had outstanding
approximately $1.2 billion of indebtedness secured by each of the Properties
as listed below:
 
<TABLE>
<CAPTION>
                                                                              ESTIMATED
                         INTEREST             ANNUAL DEBT       MATURITY      BALANCE AT
PROPERTIES                 RATE    PRINCIPAL    SERVICE           DATE         MATURITY
- ----------               --------  ---------- -----------  ------------------ ----------
                                                (IN THOUSANDS)
<S>                      <C>       <C>        <C>          <C>                <C>
599 Lexington Avenue....   7.00%   $  225,000   $15,750    July 19, 2005      $  225,000(1)
280 Park Avenue.........   7.00(2)    220,000    15,868    September 11, 2002    202,400
875 Third Avenue........   8.75       180,000    15,750(3) December 31, 2002     175,754
Riverfront Plaza(4).....   7.03       121,800    10,358    January 7, 2008        95,856
Two Independence
 Square.................   7.90(5)    121,625    10,767    February 27, 2003     113,844
One Independence
 Square.................   7.90(5)     77,688     7,038    August 21, 2001        73,938
2300 N Street...........   6.88        66,000     4,540    August 3, 2003         66,000
Capital Gallery.........   8.24        60,029     5,767    August 15, 2006        49,555
10 & 20 Burlington Mall
 Road(6)................   8.33        37,000     3,082    October 1, 2001        37,000
Ten Cambridge Center &
 North Garage...........   7.57        40,000     3,028    March 29, 2000         40,000
191 Spring Street.......   8.50        23,697     2,271    September 1, 2006      20,428
Bedford Business Park...   8.50        23,119     1,980    December 10, 2008      15,891
Montvale Center.........   8.59         7,905       779    December 1, 2006        6,556
Newport Office Park.....   8.13         6,775       794    July 1, 2001            5,764
Hilltop Business Cen-
 ter....................   7.13(7)      4,617       535    December 15, 1998       4,400
                                   ----------   -------                       ----------
  Total.................           $1,215,255   $98,307                       $1,132,386
                                   ==========   =======                       ==========
</TABLE>
- --------
(1) At maturity the lender has the option to purchase a 33.33% interest in
    this Property in exchange for the cancellation of the loan indebtedness.
    See "Business and Properties--The Office Properties--Midtown Manhattan
    Office Market--Park Avenue Submarket--Description of Park Avenue Submarket
    Properties."
(2) For purposes of calculating debt service, $213,000 of the outstanding
    balance has a fixed rate of 7.00%. The remaining $7,000 of the outstanding
    principal balance is calculated at LIBOR + 1.00%.
(3) Represents interest only payments. Principal payments begin on January 1,
    2000 based on a 30 year amortization schedule.
(4) The interest rate with respect to this loan will be fixed at a rate equal
    to the ten year treasury note rate at the date the acquisition of this
    Property is completed, plus 115 basis points. For purposes of this table,
    the ten year treasury note rate of 5.88% at November 26, 1997 was used.
    The Company has signed a purchase and sale agreement with respect to this
    Property and anticipates closing in January 1998.
(5) The interest rate increases to 8.5% on March 25, 1998 through the loan
    expiration.
(6) Includes outstanding indebtedness secured by 91 Hartwell Avenue and 92 and
    100 Hayden Avenue.
(7) LIBOR+1.50%. For purposes of calculating debt service, LIBOR as of
    September 30, 1997 was 5.63%.
 
  The Unsecured Line of Credit. The Company has a three year, $300 million
Unsecured Line of Credit that expires in June 2000. The Unsecured Line of
Credit has been and will be used to facilitate development and acquisition
activities and for working capital purposes. A portion of the proceeds of this
Offering will be used to repay the $233.0 million of outstanding indebtedness
currently outstanding under the Company's Unsecured Line of Credit. See
"Unsecured Line of Credit."
 
  Analysis of Liquidity and Capital Resources. The Company anticipates that
distributions will be paid from cash available for distribution, which is
expected to exceed cash historically available for distribution as a result of
the reduction in debt service resulting from the repayment of indebtedness.
 
  The Company expects to meet its short-term liquidity requirements generally
through its working capital and net cash provided by operations. The Company's
operating properties and hotels require periodic investments of capital for
tenant-related capital expenditures and for general capital improvements. For
the period from January 1, 1992 to September 30, 1997 the Company's recurring
tenant improvements and leasing commissions averaged $7.79 per square foot of
leased space per year. The Company expects that the average annual cost of
recurring tenant improvements and leasing commissions will be approximately
$8,116,487 based upon the
 
                                      41
<PAGE>
 
average square footage of expiring leases during the years ending December 31,
1998 through December 31, 2002 of 1,041,911 square feet. The Company expects
the cost of general capital improvements to the properties to average
$2,348,768 annually based upon an estimate of $0.20 per square foot. Actual
capital expenditures of the hotels are expected to be $2,509,000 based upon
the average annual capital expenditures at the hotels during the period from
January 1, 1992 to September 30, 1997.
 
  The Company expects to meet its long-term liquidity requirements for the
funding of property development, property acquisitions and other non-recurring
capital improvements through long-term secured and unsecured indebtedness
(including the Unsecured Line of Credit) and the issuance of additional equity
securities from the Company. The Company also intends to fund property
development, property acquisitions and other non-recurring capital
improvements using the Unsecured Line of Credit on an interim basis.
 
  The Company will have commitments to fund to completion development projects
that are currently in process. Commitments under these arrangements totaled
$89.0 million as of September 30, 1997. The Company expects to fund these
commitments initially using the Unsecured Line of Credit and cash flow from
operations. In addition, the Company has options to acquire land that require
minimum deposits that the Company will fund using the Unsecured Line of
Credit.
 
                                  CASH FLOWS
 
  Comparison for the nine months ended September 30, 1997 to the nine months
ended September 30, 1996. Cash and cash equivalents were $26.0 million and
$12.5 million at September 30, 1997 and 1996, respectively. Cash and cash
equivalents increased $17.0 million during the nine months ended September 30,
1997 compared to a decrease of $13.4 million during the nine months ended
September 30, 1996. The increase was due to a $367.5 million increase in net
cash provided by financing activities from $1.5 million used to $366.0 million
generated, a $356.6 million increase in net cash used in investing activities
from $43.0 million to $399.6 million and an increase in cash flows provided by
operating activities of $20.1 million from $31.1 million to $51.2 million. The
increase in net cash provided by financing activities of $367.5 was primarily
attributable to the Initial Offering and the proceeds received from a mortgage
note. The increase in net cash used in investing activities of $356.6 million
was attributable to an increase in the acquisition of tenant improvements,
leasing costs and new development costs. The increase in cash provided by
operating activities of $20.0 million was primarily due to a increase in net
income of $19.2 million.
 
  Comparison for the Year Ended December 31, 1996 to Year Ended December 31,
1995. Cash and cash equivalents were $9.0 million and $25.9 million at
December 31, 1996 and 1995, respectively. Cash and cash equivalents decreased
$16.9 million during 1996 compared to a decrease of $20.4 million during 1995.
The decrease was due to a $32.5 million increase in net cash used in financing
activities from $14.5 million to $47.0 million, offset by a $13.2 million
decrease in net cash used in investing activities from $36.8 million to $23.7
million and an increase in cash flows provided by operating activities of
$22.9 million from $30.9 million to $53.8 million. The increase in net cash
used in financing activities of $32.5 million was attributable to net
distributions to owners of $71.9 million offset by an increase of $39.4
million in loan proceeds net of financing costs, escrows, and loan principal
payments. The decrease in net cash used in investing activities of $13.2
million was attributable to the acquisition of the two Sugarland properties
for $7.5 million offset by a draw of restricted cash of $9.2 million and a net
decrease in additions to tenant improvements, leasing and development costs.
The increase in cash provided by operating activities of $22.9 million was due
to an increase in net income of $11.3 million and increases from accounts
receivable, escrows and prepaid expenses.
 
  Comparison for the Year Ended December 31, 1995 to Year Ended December 31,
1994. Cash and cash equivalents were $25.9 million and $46.3 million at
December 31, 1995 and 1994 respectively. Cash and cash equivalents decreased
$20.4 million during 1995 compared to a decrease of $4.4 million during 1994.
The decrease was due to an increase in cash used in investing activities of
$18.4 million from $18.4 million to $36.8 million and a decrease in cash
provided by operating activities of $16.6 million from $47.6 million to $30.9
million, offset by a decrease in net cash used in financing activities of
$19.0 million from $33.5 million to $14.5 million. The increase in cash used
in investing activities of $18.4 million was due to an increase in tenant
improvements, building improvements and leasing costs of $16.6 million and the
acquisition of 164 Lexington
 
                                      42
<PAGE>
 
Road of $1.8 million. The decrease in net cash used in financing activities of
$19.0 million was attributable to a $13.9 million decrease in net distributions
to owners and a $5.2 million decrease in loans payable and financing costs.
 
                                   INFLATION
 
  Substantially all of the office leases provide for separate real estate tax
and operating expense escalations over a base amount. In addition, many of the
leases provide for fixed base rent increases or indexed increases. The Company
believes that inflationary increases may be at least partially offset by the
contractual rent increases described above.
 
                                       43
<PAGE>
 
                            BUSINESS AND PROPERTIES
 
                                    GENERAL
 
  The Company's Properties consist of 70 Office Properties (including five
Office Development Properties and one Office Property expected to be acquired
by the Company in January 1998), nine Industrial Properties, three Hotel
Properties (including the Hotel Development Property) and the Garage Property.
The total square footage of the Properties is approximately 16.4 million
square feet, comprised of (i) 43 Class A Office Buildings (including five
Office Development Properties and one Office Property to be acquired by the
Company subsequent to the completion of this Offering) totaling approximately
10.2 million net rentable square feet, with approximately 2.5 million square
feet of structured parking for 6,913 vehicles, (ii) 27 R&D Properties totaling
approximately 1.6 million net rentable square feet, (iii) nine Industrial
Properties totaling approximately 925,000 net rentable square feet, (iv) three
Hotel Properties (including the Hotel Development Property), with 1,054 rooms,
totaling approximately 940,000 square feet, and (v) the Garage Property, with
1,170 parking spaces, consisting of approximately 330,000 square feet.
 
                                      44
<PAGE>
 
                             SUMMARY PROPERTY DATA
 
    Set forth below is a summary of information regarding the
  Properties, including the Office Development Properties and the
  Hotel Development Property. Properties marked with an asterisk
  secure indebtedness of the Company.
<TABLE>
<CAPTION>
                                                                                                                        ANNUALIZED
                                                                             NET     PERCENT     ANNUALIZED              RENT PER
                                                      YEAR(S)       NO.    RENTABLE  LEASED         RENT     PERCENT OF   LEASED
                                        PERCENT       BUILT/         OF     SQUARE    AS OF        AS OF     ANNUALIZED   SQUARE
PROPERTY NAME           LOCATION       OWNERSHIP   RENOVATED(1)    BLDGS.    FEET    9/30/97     9/30/97(2)     RENT     FOOT(2)
- -------------           --------       --------- ----------------- ------ ---------- -------    ------------ ---------- ----------
<S>               <C>                  <C>       <C>               <C>    <C>        <C>        <C>          <C>        <C>
OFFICE PROPER-
 TIES:
Class A Office
Buildings:
+*599 Lexington
Avenue (4)......  New York, NY           100.0%               1986    1    1,000,070   100%     $ 53,054,876    17.6%     $53.21
+*280 Park Ave-
nue.............  New York, NY           100.0          1968/95-96    1    1,198,769    82        40,249,001    13.3       41.95
+*875 Third Ave-
nue (5).........  New York, NY           100.0                1982    1      681,669    99        28,874,388     9.6       42.37
*Two Indepen-
dence Square
(6).............  SW, Washington, DC     100.0                1992    1      579,600   100        21,317,592     7.1       36.88
*Riverfront
Plaza (7).......  Richmond, VA           100.0                1990    1      899,720    97        17,563,259     5.8       20.16
100 East Pratt
Street (8)......  Baltimore, MD          100.0           1975/1991    1      633,482    98        15,224,424     5.0       24.53
Democracy Cen-
ter.............  Bethesda, MD           100.0       1985-88/94-96    3      680,000    97        14,669,523     4.9       22.26
*2300 N Street..  NW, Washington, DC     100.0                1986    1      280,065   100        12,911,442     4.3       46.10
*One Indepen-
dence Square
(6).............  SW, Washington, DC     100.0                1991    1      337,794   100        12,677,045     4.2       37.53
*Capital Gal-
lery............  SW, Washington, DC     100.0                1981    1      399,549    90        11,691,352     3.9       32.36
The U.S. Inter-
national Trade
Commission Bldg
(6)(9)..........  SW, Washington, DC     100.0                1987    1      243,998   100         7,488,284     2.5       30.69
One Cambridge
Center..........  Cambridge, MA          100.0                1987    1      215,385    99         6,128,729     2.0       28.65
*Ten Cambridge
Center..........  Cambridge, MA          100.0                1990    1      152,664   100         4,236,035     1.4       27.75
*191 Spring
Street..........  Lexington, MA          100.0           1971/1995    1      162,700   100         4,035,648     1.3       24.80
*Newport Office
Park............  Quincy, MA             100.0                1988    1      168,829   100         3,267,240     1.1       19.35
*10 & 20 Bur-
lington Mall
Road............  Burlington, MA         100.0   1984-1986/95-96 2    2      152,552    98         3,257,655     1.1       21.76
Lexington Office
Park............  Lexington, MA          100.0                1982    2      168,500    86         3,172,966     1.1       21.78
*91 Hartwell Av-
enue............  Lexington, MA          100.0             1985/96    1      122,135   100         2,729,205     0.9       22.35
Waltham Office
Center..........  Waltham, MA            100.0   1968-1970/87-88 3    3      129,658    95         2,476,715     0.8       20.17
Three Cambridge
Center..........  Cambridge, MA          100.0                1987    1      107,484   100         2,306,623     0.8       21.46
*Montvale Center
(10)............  Gaithersburg, MD        75.0                1987    1      122,157    98         2,156,064     0.7       18.09
170 Tracer
Lane............  Waltham, MA            100.0                1980    1       73,258   100         1,737,309     0.6       23.71
195 West
Street..........  Waltham, MA            100.0                1990    1       63,500   100         1,600,931     0.5       25.21
*Bedford Busi-
ness Park.......  Bedford, MA            100.0                1980    1       90,000   100         1,590,814     0.5       17.68
33 Hayden Ave-
nue.............  Lexington, MA          100.0                1979    1       79,564   100         1,296,766     0.4       16.30
*100 Hayden Ave-
nue.............  Lexington, MA          100.0                1985    1       55,924   100         1,176,733     0.4       21.04
Eleven Cambridge
Center..........  Cambridge, MA          100.0                1984    1       79,616   100         1,118,563     0.4       14.05
8 Arlington
Street (11).....  Boston, MA             100.0      1860-1920/1989    1       30,526   100         1,080,172     0.4       35.39
32 Hartwell Ave-
nue.............  Lexington, MA          100.0      1968-1979/1987    1       69,154   100         1,022,128     0.3       14.78
204 Second Ave-
nue.............  Waltham, MA            100.0           1981/1993    1       40,974   100           876,976     0.3       21.40
*92 Hayden Ave-
nue.............  Lexington, MA          100.0           1968/1984    1       30,980   100           649,672     0.2       20.97
201 Spring
Street (12).....  Lexington, MA          100.0                1997    1      102,000    --                --      --          --
                                                                    ---   ----------   ---      ------------   -----      ------
SUBTOTAL/WEIGHTED AVERAGE FOR CLASS A OFFICE BUILDINGS (13)......    38    9,152,276   96%      $281,638,130    93.4%     $32.49
                                                                    ---   ----------   ---      ------------   -----      ------
R&D Properties:
*Bedford Busi-
ness Park.......  Bedford, MA            100.0%       1962-1978/96    2      383,704   100%     $  3,780,214     1.3%     $ 9.85
7601 Boston Bou-
levard, Building
Eight (6)(14)...  Springfield, VA        100.0                1986    1      103,750   100         1,442,674     0.5       13.91
Fourteen Cam-
bridge Center...  Cambridge, MA          100.0                1983    1       67,362   100         1,366,714     0.5       20.29
*Hilltop Busi-
ness Center
(15)............  S. San Francisco, CA    35.7        early 1970's    9      144,479    91         1,061,181     0.4        8.06
7435 Boston Bou-
levard, Building
One.............  Springfield, VA        100.0                1982    1      105,414    66           764,560     0.3       10.91
7500 Boston Bou-
levard, Building
Six (6).........  Springfield, VA        100.0                1985    1       79,971   100           803,582     0.3       10.05
8000 Grainger
Court, Building
Five............  Springfield, VA        100.0                1984    1       90,465   100           764,369     0.3        8.45
7600 Boston Bou-
levard, Building
Nine............  Springfield, VA        100.0                1987    1       69,832   100           742,413     0.2       10.63
Sugarland Build-
ing One.........  Herndon, VA            100.0           1985/1997    1       52,797    82           741,041     0.2       17.12
7451 Boston Bou-
levard, Building
Two.............  Springfield, VA        100.0                1982    1       47,001   100           660,950     0.2       14.06
164 Lexington
Road............  Billerica, MA          100.0                1982    1       64,140   100           598,478     0.2        9.33
7374 Boston Bou-
levard, Building
Four (6)........  Springfield, VA        100.0                1984    1       57,321   100           595,622     0.2       10.39
Sugarland Build-
ing Two.........  Herndon, VA            100.0           1986/1997    1       59,423    46           416,390     0.1       15.30
8000 Corporate
Court, Building
Eleven..........  Springfield, VA        100.0                1989    1       52,539   100           412,377     0.1        7.85
7375 Boston Bou-
levard, Building
Ten (6).........  Springfield, VA        100.0                1988    1       26,865   100           399,222     0.1       14.86
17 Hartwell Ave-
nue.............  Lexington, MA          100.0                1968    1       30,000   100           277,500     0.1        9.25
7700 Boston Bou-
levard, Building
Twelve (16).....  Springfield, VA        100.0                1997    1       82,224    --                --      --          --
7501 Boston
Boulevard,
Building Seven
(6)(17).........  Springfield, VA        100.0                1997    1       75,756    --                --      --          --
                                                                    ---   ----------   ---      ------------   -----      ------
SUBTOTAL/WEIGHTED AVERAGE FOR R&D PROPERTIES.....................    27    1,593,043   94%      $ 14,827,287     4.9%     $11.02
                                                                    ---   ----------   ---      ------------   -----      ------
INDUSTRIAL PROP-
ERTIES:
38 Cabot Boule-
vard (18).......  Bucks County, PA       100.0%          1972/1984    1      161,000   100%     $    868,699     0.3%     $ 5.40
40-46 Harvard
Street..........  Westwood, MA           100.0           1967/1996    1      169,273    90           854,020     0.3        5.62
25-33 Dartmouth
Street..........  Westwood, MA           100.0           1966/1996    1       78,045   100           795,124     0.3       10.19
2000 South Club
Drive, Building
Three...........  Landover, MD           100.0                1988    1       83,608   100           701,770     0.2        8.39
2391 West Winton
Avenue..........  Hayward, CA            100.0                1974    1      221,000   100           676,188     0.2        3.07
6201 Columbia
Park Road,
Building Two....  Landover, MD           100.0                1986    1       99,885    56           451,475     0.1        8.07
1950 Stanford
Court, Building
One.............  Landover, MD           100.0                1986    1       53,250   100           371,682     0.1        6.98
560 Forbes Bou-
levard (14).....  S. San Francisco, CA    35.7        early 1970's    1       40,000   100           237,890     0.1        5.95
430 Rozzi Place
(14)............  S. San Francisco, CA    35.7        early 1970's    1       20,000   100           114,949     0.0        5.75
                                                                    ---   ----------   ---      ------------   -----      ------
SUBTOTAL/WEIGHTED AVERAGE FOR INDUSTRIAL PROPERTIES..............     9      926,061   93%      $  5,071,797     1.7%     $ 5.87
                                                                    ---   ----------   ---      ------------   -----      ------
DEVELOPMENT
PROPERTIES:
Class A Office
Properties:
One and Two
Reston Overlook
(5)(19).........  Reston, VA              25.0%               1999    2      440,000    --      $         --      --      $   --
One Freedom
Square (20).....  Reston, VA              25.0                1999    1      406,980    --                --      --          --
Eight Cambridge
Center (21).....  Cambridge, MA          100.0                1999    1      134,054    --                --      --          --
181 Spring
Street (22).....  Lexington, MA          100.0                1999    1       52,000    --                --      --          --
                                                                    ---   ----------   ---      ------------   -----      ------
SUBTOTAL/WEIGHTED AVERAGE FOR OFFICE DEVELOPMENT PROPERTIES......     5    1,033,034    --                --      --          --
                                                                    ---   ----------   ---      ------------   -----      ------
TOTAL/WEIGHTED AVERAGE FOR ALL OFFICE AND INDUSTRIAL PROPERTIES..    79   12,704,414   96%(23)  $301,537,214   100.0%     $27.72
                                                                    ---   ----------   ---      ------------   -----      ------
<CAPTION>
                  ANNUALIZED
                     NET
                  EFFECTIVE
                   RENT PER
                    LEASED
                    SQUARE
PROPERTY NAME      FOOT(3)
- -------------     ----------
<S>               <C>
OFFICE PROPER-
 TIES:
Class A Office
Buildings:
+*599 Lexington
Avenue (4)......    $47.11
+*280 Park Ave-
nue.............     43.18
+*875 Third Ave-
nue (5).........     43.27
*Two Indepen-
dence Square
(6).............     37.05
*Riverfront
Plaza (7).......     21.51
100 East Pratt
Street (8)......     25.91
Democracy Cen-
ter.............     20.93
*2300 N Street..     44.91
*One Indepen-
dence Square
(6).............     34.22
*Capital Gal-
lery............     31.07
The U.S. Inter-
national Trade
Commission Bldg
(6)(9)..........     25.94
One Cambridge
Center..........     25.78
*Ten Cambridge
Center..........     23.10
*191 Spring
Street..........     21.92
*Newport Office
Park............     17.57
*10 & 20 Bur-
lington Mall
Road............     18.97
Lexington Office
Park............     18.97
*91 Hartwell Av-
enue............     20.81
Waltham Office
Center..........     18.21
Three Cambridge
Center..........     20.45
*Montvale Center
(10)............     15.71
170 Tracer
Lane............     19.04
195 West
Street..........     20.84
*Bedford Busi-
ness Park.......     15.56
33 Hayden Ave-
nue.............     16.30
*100 Hayden Ave-
nue.............     19.38
Eleven Cambridge
Center..........     11.30
8 Arlington
Street (11).....     35.91
32 Hartwell Ave-
nue.............     14.39
204 Second Ave-
nue.............     18.29
*92 Hayden Ave-
nue.............     17.34
201 Spring
Street (12).....        --
                  ----------
SUBTOTAL/WEIGHTED AVERAGE FOR CLASS A OFFICE BUILDINGS (13)......    $31.18
                  ----------
R&D Properties:
*Bedford Busi-
ness Park.......    $ 8.00
7601 Boston Bou-
levard, Building
Eight (6)(14)...     13.90
Fourteen Cam-
bridge Center...     18.33
*Hilltop Busi-
ness Center
(15)............      9.62
7435 Boston Bou-
levard, Building
One.............      8.48
7500 Boston Bou-
levard, Building
Six (6).........     10.05
8000 Grainger
Court, Building
Five............      8.04
7600 Boston Bou-
levard, Building
Nine............     10.05
Sugarland Build-
ing One.........     16.97
7451 Boston Bou-
levard, Building
Two.............      8.19
164 Lexington
Road............      8.50
7374 Boston Bou-
levard, Building
Four (6)........     10.14
Sugarland Build-
ing Two.........     16.01
8000 Corporate
Court, Building
Eleven..........      7.57
7375 Boston Bou-
levard, Building
Ten (6).........      8.96
17 Hartwell Ave-
nue.............      8.95
7700 Boston Bou-
levard, Building
Twelve (16).....        --
7501 Boston
Boulevard,
Building Seven
(6)(17).........        --
                  ----------
SUBTOTAL/WEIGHTED AVERAGE FOR R&D PROPERTIES.....................    $ 9.98
                  ----------
INDUSTRIAL PROP-
ERTIES:
38 Cabot Boule-
vard (18).......    $ 5.40
40-46 Harvard
Street..........      5.47
25-33 Dartmouth
Street..........      9.86
2000 South Club
Drive, Building
Three...........      7.03
2391 West Winton
Avenue..........      3.78
6201 Columbia
Park Road,
Building Two....      6.48
1950 Stanford
Court, Building
One.............      7.38
560 Forbes Bou-
levard (14).....      5.52
430 Rozzi Place
(14)............      5.25
                  ----------
SUBTOTAL/WEIGHTED AVERAGE FOR INDUSTRIAL PROPERTIES..............    $ 5.75
                  ----------
DEVELOPMENT
PROPERTIES:
Class A Office
Properties:
One and Two
Reston Overlook
(5)(19).........    $   --
One Freedom
Square (20).....        --
Eight Cambridge
Center (21).....        --
181 Spring
Street (22).....        --
                  ----------
SUBTOTAL/WEIGHTED AVERAGE FOR OFFICE DEVELOPMENT PROPERTIES......        --
                  ----------
TOTAL/WEIGHTED AVERAGE FOR ALL OFFICE AND INDUSTRIAL PROPERTIES..    $26.54
                  ----------
</TABLE>
 
                                       45
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                        NINE MONTHS               NINE MONTHS
                                                                                       ENDED 9/30/97             ENDED 9/30/96
                                                                               ------------------------------ --------------------
                                                                                         AVERAGE REVENUE PER  AVERAGE REVENUE PER
                                                    NUMBER   NUMBER                       DAILY   AVAILABLE    DAILY   AVAILABLE
                                   PERCENT   YEAR     OF       OF     SQUARE    AVERAGE   RATE       ROOM      RATE       ROOM
                      LOCATION    OWNERSHIP  BUILT BUILDINGS ROOMS   FOOTAGE   OCCUPANCY  (ADR)  (REVPAR)(25)  (ADR)  (REVPAR)(25)
                    ------------- ---------  ----- --------- ------ ---------- --------- ------- ------------ ------- ------------
 <S>                <C>           <C>        <C>   <C>       <C>    <C>        <C>       <C>     <C>          <C>     <C>
 HOTEL PROPER-
  TIES:
 Long Wharf
 Marriott(R).....   Boston, MA      100.0%   1982       1      402     420,000   88.0%
 Cambridge Center
 Marriott(R).....   Cambridge, MA   100.0    1986       1      431     330,400   88.0
 Residence Inn by
 Marriott(R)(24)
 ................   Cambridge, MA   100.0    1999       1      221     187,474    N/A
                                                      ---    -----  ----------   ----
 TOTAL/WEIGHTED AVERAGE FOR HOTEL PROPERTIES....        3    1,054     937,874   88.0%   $194.58   $172.32    $178.61   $153.78
                                                      ---    =====  ==========   ====    =======   =======    =======   =======
<CAPTION>
                                                    NUMBER   NUMBER
                                   PERCENT   YEAR     OF       OF     SQUARE
                      LOCATION    OWNERSHIP  BUILT BUILDINGS SPACES  FOOTAGE
                    ------------- ---------  ----- --------- ------ ----------
 <S>                <C>           <C>        <C>   <C>       <C>    <C>        <C>       <C>     <C>          <C>     <C>
 GARAGE PROPERTY:
 Cambridge Center
 North Garage....   Cambridge, MA     100.0% 1990       1    1,170     332,442
                                                      ---
 STRUCTURED PARK-
 ING INCLUDED IN
 CLASS A OFFICE
 BUILDINGS.......                                            6,913   2,463,530
                                                             -----  ----------
 TOTAL FOR GARAGE
 PROPERTY AND
 STRUCTURED PARK-
 ING.............                                            8,083   2,795,972
                                                             =====  ----------
 TOTAL FOR ALL
 PROPERTIES......                                      83           16,438,260
                                                      ===           ==========
</TABLE>
- -------
 + This Property accounted for more than 10% of the Company's revenue for the
   pro forma twelve months ended September 30, 1997 or the book value of this
   Property accounted for more than 10% of the Company's total assets at such
   time. For additional information about this Property, see the description
   of the Property under "Business and Properties--The Office Properties."
 * Upon completion of this Offering, the Company expects to have outstanding
   approximately $1.2 billion of indebtedness secured by these Properties. See
   "Management's Discussion and Analysis of Financial Condition and Results of
   Operations--Liquidity and Capital Resources."
 (1) These dates do not include years in which tenant improvements were made
     to the Properties, except with respect to 25-33 Dartmouth Street and 40-
     46 Harvard Street, whose interiors were completely rebuilt to satisfy
     tenant needs in 1996.
 (2) Annualized Rent is the monthly contractual rent under existing leases as
     of September 30, 1997 multiplied by twelve. 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 September 30, 1997 were, on an annual basis, $12.9 million.
 (3) Annualized Net Effective Rent is calculated for leases in effect as of
     September 30, 1997 as follows: Annualized Rent, calculated as described
     above (but by determining monthly rent on a straight line basis in
     accordance with GAAP rather than adding back any rent abatement) was
     reduced to reflect the annualized costs of tenant improvements and
     leasing commissions, if any, paid or payable by the Company (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 twelve).
 (4) The Company's New York offices are located in this building, where it
     occupies 12,896 square feet.
 (5) The Company completed its acquisition of this Property on November 21,
     1997.
 (6) The Property is leased on the basis of net usable square feet (which have
     been converted to net rentable square feet for purposes of this table)
     due to the requirements of the General Services Administration (the
     "GSA").
 (7) The Company has entered into a contract to acquire this Property and
     anticipates a closing date in January 1998.
 (8) The Company completed its acquisition of this Property on October 23,
     1997.
 (9) The Company's Washington, D.C. offices are located in this building, also
     known as 500 E Street, where it occupies 15,612 square feet.
(10) The Company owns a 75.0% general partner interest in the limited
     partnership that owns this property. Because of the priority of the
     Company's partnership interest, the Company expects to receive any
     partnership distributions that are made with respect to this property.
(11) The Property, which is used exclusively as the Company's headquarters,
     was constructed in two phases, circa 1860 and circa 1920.
(12) The Property is 100% leased to MediaOne of Delaware, Inc., formerly known
     as Continental Cablevision, Inc., whose lease commenced on November 1,
     1997.
(13) The Class A Office Buildings contain 6,913 structured parking spaces.
(14) The General Services Administration, the tenant of this Property, has an
     option to purchase this Property on September 30, 1999 for $14.0 million
     and on September 30, 2014 for $22.0 million.
(15) The Company owns a 35.7% controlling general partnership interest in this
     Property.
(16) The Property is 100% leased to Autometric, Inc., whose lease commenced on
     October 15, 1997.
(17) The Property is 100% leased to the General Services Administration, whose
     lease commenced on November 14, 1997.
(18) The original building (100,000 net rentable square feet ) was built in
     1972, with an expansion building (61,000 net rentable square feet)
     completed in 1984.
(19) The Company is acting as development manager of these Properties and will
     be a 25.0% member of a limited liability company that will own the
     Properties. The Company's economic interest increases above 25.0% if
     certain performance criteria are achieved. The Properties are expected to
     be completed in 1999 and are 70.0% pre-leased to BDM International.
(20) The Company is acting as development manager of this Property and will be
     a 25% member of a limited liability company that will own the Property.
     The Company's economic interest increases above 25.0% if certain
     performance criteria are achieved. The Property is 59% pre-committed to
     Anderson Consulting.
(21) This Property which is currently in development, is 100% pre-committed to
     a leading Massachusetts based high-tech consulting firm. The Property is
     expected to be completed in Q1 of 1999.
(22) The Property, which is currently under development by the Company, is
     expected to be completed in late 1999.
(23) Does not include the Office Development Properties.
(24) The Property which is currently under development by the Company, is
     expected to be completed in January of 1999. This will be a limited
     service, extended stay Hotel.
(25) REVPAR is determined by dividing room revenue by available rooms for the
     applicable period. Management believes that REVPAR (as defined more fully
     in the Glossary) is an industry standard measure used to present hotel
     operating data.
 
DEVELOPMENT PARCELS
 
  The Company owns, has under contract, or has an option to develop or acquire
six parcels consisting of an aggregate of 39.0 acres of land. The Company
believes that this land, some of which needs zoning or other regulatory
approvals prior to development, will be able to support an aggregate of
approximately 629,000 square feet of development. The following chart provides
additional information with respect to undeveloped parcels:
 
<TABLE>
<CAPTION>
                                          NO. OF                    DEVELOPABLE
LOCATION           SUBMARKET              PARCELS     ACREAGE     SQUARE FEET (1)
- --------           ---------              -------     -------     ---------------
<S>                <C>                    <C>         <C>         <C>
Springfield, VA    Fairfax County, VA         3         9.4           130,000
Cambridge, MA      East Cambridge, MA         1         2.6           209,000
Andover, MA        Route 495 N                2        27.0           290,000
                                            ---        ----           -------
 Total                                        6        39.0           629,000
                                            ===        ====           =======
</TABLE>
- -------
(1) Represents the total square feet of development that the parcel(s) will
    support.
 
                                      46
<PAGE>
 
                            LOCATION OF PROPERTIES
  The following chart shows the geographic location of the Company's Office
and Industrial Properties, including the Office Development Properties, by net
rentable square feet (excluding storage space) and Annualized Rent as of
September 30, 1997:
<TABLE>
<CAPTION>
                                          NET RENTABLE SQUARE FEET OF
                                       OFFICE AND INDUSTRIAL PROPERTIES
                              ------------------------------------------------------
                     NUMBER    CLASS A                                       PERCENT
                       OF       OFFICE       R&D      INDUSTRIAL               OF
 MARKET/SUBMARKET  PROPERTIES BUILDINGS   PROPERTIES  PROPERTIES   TOTAL      TOTAL
 ----------------  ---------- ---------   ----------  ----------   -----     -------
<S>                <C>        <C>         <C>         <C>        <C>         <C>
GREATER BOSTON
 East
 Cambridge(2)....       6        689,203     67,362        --       756,565     6.0%
 Route 128 NW
 Bedford, MA.....       3         90,000    383,704        --       473,704     3.7
 Billerica, MA...       1            --      64,140        --        64,140     0.5
 Burlington, MA..       2        152,552        --         --       152,552     1.2
 Lexington, MA
 (3).............      11        842,957     30,000        --       872,957     6.9
 Route 128/MA
 Turnpike
 Waltham, MA.....       6        307,390        --         --       307,390     2.4
 Route 128 SW
 Westwood, MA....       2            --         --     247,318      247,318     2.0
 Route 128 South
 Quincy, MA......       1        168,829        --         --       168,829     1.3
 Boston..........       1         30,526        --         --        30,526     0.2
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........      33      2,281,457    545,206    247,318    3,073,981    24.2%
GREATER
WASHINGTON, D.C.
 SW Washington,
 D.C.(4).........       4      1,560,941        --         --     1,560,941    12.3%
 West End
 Washington,
 D.C. ...........       1        280,065        --         --       280,065     2.2
 Montgomery
 County, MD
 Bethesda, MD....       3        680,000        --         --       680,000     5.4
 Gaithersburg, MD
 (5).............       1        122,157        --         --       122,157     1.0
 Fairfax County,
 VA
 Herndon, VA ....       2            --     112,220        --       112,220     0.9
 Reston, VA (6)..       3        846,980        --         --       846,980     6.7
 Springfield, VA
 (4)(7)..........      11            --     791,138        --       791,138     6.2
 Prince George's
 County, MD
 Landover, MD....       3            --         --     236,743      236,743     1.9
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........      28      3,490,143    903,358    236,743    4,630,244    36.4%
BALTIMORE, MD           1        633,482        --         --       633,482     5.0%
RICHMOND, VA (8)        1        899,720        --         --       899,720     7.1%
MIDTOWN MANHATTAN
 Park Avenue.....       2      2,198,839        --         --     2,198,839    17.3%
 Eastside........       1        681,669        --         --       681,669     5.4
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........       3      2,880,508        --         --     2,880,508    22.7%
GREATER SAN
FRANCISCO
 Hayward, CA.....       1            --         --     221,000      221,000     1.7%
 San Francisco,
 CA (9)..........      11                   144,479     60,000      204,479     1.6
                      ---     ----------  ---------    -------   ----------   -----
Subtotal.........      12            --     144,479    281,000      425,479     3.3%
BUCKS COUNTY,
PA...............       1            --         --     161,000      161,000     1.3%
                      ---     ----------  ---------    -------   ----------   -----
TOTAL............      79     10,185,310  1,593,043    926,061   12,704,414   100.0
                      ===     ==========  =========    =======   ==========   =====
PERCENT OF TOTAL.............       80.2%      12.5%       7.3%       100.0%
NUMBER OF OFFICE AND
INDUSTRIAL PROPERTIES........         43         27          9           79
<CAPTION>
                                                     ANNUALIZED
                                              1997 RENT OF OFFICE AND
                                             INDUSTRIAL PROPERTIES (1)
                              ------------------------------------------------------
                     CLASS A                                            PERCENT
                      OFFICE         R&D      INDUSTRIAL                  OF
 MARKET/SUBMARKET   BUILDINGS    PROPERTIES   PROPERTIES     TOTAL       TOTAL
 ----------------  ------------- ----------   ----------     -----      -------
<S>                <C>           <C>          <C>         <C>           <C>
GREATER BOSTON
 East
 Cambridge(2)....  $ 13,789,950  $ 1,366,714         --   $ 15,156,664     5.0%
 Route 128 NW
 Bedford, MA.....     1,590,814    3,780,214         --      5,371,028     1.8
 Billerica, MA...           --       598,478         --        598,478     0.2
 Burlington, MA..     3,257,655          --          --      3,257,655     1.1
 Lexington, MA
 (3).............    14,083,118      277,500         --     14,360,618     4.8
 Route 128/MA
 Turnpike
 Waltham, MA.....     6,691,931          --          --      6,691,931     2.2
 Route 128 SW
 Westwood, MA....           --           --    1,649,144     1,649,144     0.6
 Route 128 South
 Quincy, MA......     3,267,240          --          --      3,267,240     1.1
 Boston..........     1,080,172          --          --      1,080,172     0.4
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $ 43,760,880  $ 6,022,906  $1,649,144  $ 51,432,930    17.1%
GREATER
WASHINGTON, D.C.
 SW Washington,
 D.C.(4).........  $ 53,174,273  $       --   $      --   $ 53,174,273    17.6%
 West End
 Washington,
 D.C. ...........    12,911,442          --          --     12,911,442     4.3
 Montgomery
 County, MD
 Bethesda, MD....    14,669,523          --          --     14,669,523     4.9
 Gaithersburg, MD
 (5).............     2,156,064          --          --      2,156,064     0.7
 Fairfax County,
 VA
 Herndon, VA ....           --     1,157,431         --      1,157,431     0.4
 Reston, VA (6)..           --           --          --            --      --
 Springfield, VA
 (4)(7)..........           --     6,585,769         --      6,585,769     2.2
 Prince George's
 County, MD
 Landover, MD....           --           --    1,524,927     1,524,921     0.5
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $ 82,911,302  $ 7,743,200  $1,524,927  $ 92,179,429    30.6%
BALTIMORE, MD      $ 15,224,424  $       --   $      --   $ 15,224,424     5.0%
RICHMOND, VA (8)   $ 17,563,259  $       --   $      --   $ 17,563,259     5.8%
MIDTOWN MANHATTAN
 Park Avenue.....  $ 93,303,877  $       --   $      --   $ 93,303,877    30.9%
 Eastside........    28,874,388          --          --     28,874,388     9.6
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $122,178,265  $       --   $      --   $122,178,265    40.5%
GREATER SAN
FRANCISCO
 Hayward, CA.....  $        --   $       --   $  676,188  $    676,188     0.2%
 San Francisco,
 CA (9)..........           --     1,061,181     352,839     1,414,020     0.5
                   ------------- ------------ ----------- ------------- -------
Subtotal.........  $        --   $ 1,061,181  $1,029,027  $  2,090,208     0.7%
BUCKS COUNTY,
PA...............  $        --   $       --   $  868,699  $    868,699     0.3%
                   ------------- ------------ ----------- ------------- -------
TOTAL............  $281,638,130  $14,827,287  $5,071,797  $301,537,214   100.0%
                   ============= ============ =========== ============= =======
PERCENT OF TOTAL.............         93.4%         4.9%        1.7%        100.0%
NUMBER OF OFFICE AND
INDUSTRIAL PROPERTIES........           43           27           9            79
</TABLE>
- ----
(1) Annualized Rent is the monthly contractual rent under existing leases as
    of September 30, 1997 multiplied by twelve. 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, on an annualized basis, were
    approximately $12.9 million.
(2) Does not include Annualized Rent for one Class A Office Building currently
    under development by the Company.
(3) Does not include 1997 Annualized Rent for two Class A Office Buildings
    currently under development by the Company.
(4) Certain of such Properties are leased on the basis of net usable square
    feet (which has been converted to net rentable square feet for purposes of
    this table) due to the requirements of the GSA.
(5) The Company owns a 75.0% general partner interest in the limited
    partnership that owns this property. Because of the priority of the
    Company's partnership interest, the Company expects to receive any
    partnership distributions that are made with respect to this Property.
(6) Does not include 1997 Annualized Rent for three Class A Office Buildings
    currently under development by the Company. The Company is acting as
    development manager of, and will be a 25.0% member of, the limited
    liability company that will own these Properties. The Company's economic
    interest may increase above 25.0% depending upon the achievement of
    certain performance goals.
(7) Does not include 1997 Annualized Rent for two Office Properties currently
    under development by the Company.
(8) The Company has entered into a purchase and sale agreement with respect to
    this Property and anticipates a closing date in January 1998.
(9) The Company owns a 35.7% controlling general partnership interest in the
    nine R&D Properties and two Industrial Properties located in Greater San
    Francisco, California.
 
                                       47
<PAGE>
 
                                    TENANTS
 
TENANT DIVERSIFICATION
 
  The Properties currently are leased to 498 tenants that are engaged in a
variety of businesses, including financial services, investment banking,
publishing, computer technology, health care services, accounting and law. The
following table sets forth information regarding the leases with respect to
the 25 largest tenants at the Properties, based on the amount of square
footage leased by such tenants as of September 30, 1997:
 
<TABLE>
<CAPTION>
                                                                    REMAINING               PERCENTAGE
                                                                    LEASE TERM  TOTAL NET  OF AGGREGATE
                                                                        IN      RENTABLE      LEASED
         TENANT                        PROPERTY                       MONTHS   SQUARE FEET SQUARE FEET
         ------                        --------                     ---------- ----------- ------------
<S>                      <C>                                        <C>        <C>         <C>
General Services
 Administration:(1)
 National Aeronautics
  and Space
  Administration(2)..... Two Independence Square                         178      569,337       7.7%
 U.S. International      The U.S. International Trade
  Trade Commission(3)... Commission Building                             118      217,772       2.9
 U.S. Customs            7601 Boston Boulevard, Building Eight
  Service(4)............                                                 204      103,750       1.4
 U.S. Department of      7500 Boston Boulevard, Building Six
  State(5)..............                                                  29       79,971       1.1
 U.S. Department of      7374 Boston Boulevard, Building Four
  State(6)..............                                                  36       57,321       0.8
 U.S. Customs            7375 Boston Boulevard, Building Ten
  Service(7)............                                                 117       11,398       0.2
                                                                                ---------      ----
   Total GSA Square
    Footage.............                                                        1,039,549      14.0
Shearman & Sterling..... 599 Lexington Avenue                            119      424,649       3.9
Office of the
 Comptroller of the
 Currency(8)............ One Independence Square                         104      331,518       3.0
Hunton & Williams....... Riverfront Plaza                                102      302,424       2.8
Debevoise & Plimpton.... 875 Third Avenue                                 61      279,375       2.6
ComputerVision.......... Bedford Business Park                         28-91      273,704       2.5
Lockheed Martin          Democracy Center,
 Corporation(9)......... 8000 Grainger Court, Building Five,
                         7435 Boston Boulevard, Building One,
                         7451 Boston Boulevard, Building Two,
                         7375 Boston Boulevard, Building Ten,
                         and Capital Gallery                           12-57      267,355       2.5
T. Rowe Price            100 East Pratt Street
 Associates, Inc........                                               8/109      268,842       2.5
Camp Dresser & McKee,    One and Ten Cambridge Center
 Inc. ..................                                                  30      214,725       2.0
Bankers Trust Company... 280 Park Avenue                                 161      208,276       1.9
Shaw, Pittman, Potts &   2300 N Street
 Trowbridge.............                                                 108      204,154       1.9
Wheat First Butcher      Riverfront Plaza
 Singer, Inc. ..........                                                  99      202,919       1.9
National Football        280 Park Avenue
 League.................                                                 173      201,658       1.9
The Stride Rite          191 Spring Street
 Corporation............                                                 106      162,700       1.5
J.I. Case Company....... 38 Cabot Boulevard                                9      161,000       1.5
Restoration Hardware.    2391 West Winton Avenue
 Inc....................                                                  94      160,213       1.5
Furman Selz LLC (10).... 280 Park Avenue                                 196      159,288       1.5
Medisense, Inc. ........ Bedford Business Park                           105      150,000       1.4
Instinet Corporation.... 875 Third Avenue                                 70      148,000       1.4
Jones, Day, Reavis &     599 Lexington Avenue
 Pogue..................                                              53-104      144,289       1.3
Sidley & Austin......... 875 Third Avenue                                 57      131,250       1.2
Output Technologies,     40-46 Harvard Street
 Inc. ..................                                                  70      128,105       1.2
Mercer Management        33 Hayden Avenue and 2300 N Street
 Consulting, Inc........                                               50-53      119,215       1.1
Harvard Pilgrim Health   100 Hayden Avenue and 170 Tracer Lane
 Care, Inc. ............                                               29-38      115,448       1.1
Citibank, N.A. ......... 599 Lexington Avenue                             63      114,350       1.1
</TABLE>
- --------
(1) All GSA leases are full faith and credit obligations of the United States
    Government. The GSA accounted for approximately 10.3% of total Annualized
    Rent of Office and Industrial Properties as of September 30, 1997.
(2) Lease with the GSA for a net usable square footage amount of 488,374.
(3) Lease with the GSA for a net usable square footage amount of 198,388.
(4) Lease with the GSA for a net usable square footage amount of 99,155.
(5) Lease with the GSA for a net usable square footage amount of 77,142.
(6) Lease with the GSA for a net usable square footage amount of 47,629.
(7) Lease with the GSA for a net usable square footage amount of 9,911.
(8) Lease measured in net usable square footage of 293,736.
(9) LMC Properties, Inc., a subsidiary of Lockheed Martin Corporation, leases
    179,059 of the 267,355 square feet shown. Lockheed Martin Corporation
    guarantees such leases.
(10) The Company has committed to lease an additional 46,078 square feet to
     Furman Selz LLC effective November 1, 1997.
 
                                      48
<PAGE>
 
LEASE EXPIRATIONS OF OFFICE AND INDUSTRIAL PROPERTIES
 
  The following table sets forth a schedule of lease expirations for leases in
place as of September 30, 1997, for each of the ten years beginning with
October 1, 1997, for the Office and Industrial Properties, on an aggregate
basis by property type and submarket, assuming that none of the tenants
exercise renewal options and excluding an aggregate of 533,747 square feet of
unleased space.
 
OFFICE PROPERTIES
(MARKET/SUBMARKET)
 
<TABLE>
<CAPTION>
 CLASS A OFFICE
 BUILDINGS              1997        1998        1999        2000        2001        2002        2003        2004        2005
 --------------      ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------
 <S>                 <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>
 GREATER BOSTON
 (1)
 East Cambridge
  Square footage
  of expiring
  leases..........       57,177     105,163      61,490     217,684       2,912       6,359      34,837           0           0
  Percentage of
  total rentable
  sq. ft..........        10.30%      18.94%      11.08%      39.21%       0.52%       1.15%       6.28%       0.00%       0.00%
  Annualized Rent
  (2).............   $1,408,934  $1,678,287  $1,513,228  $6,704,842  $   85,698  $  178,052  $  769,614  $        0  $        0
  No. of tenants
  whose leases ex-
  pire............            7           5          11           3           1           1           3           0           0
  Annualized Rent
  per leased sq.
  ft. ............   $    22.64  $    15.96  $    24.61  $    30.80  $    29.43  $    28.00  $    22.09  $     0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $    26.92  $    18.04  $    29.10  $    32.19  $    29.43  $    28.00  $    29.95  $     0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    28.72
 Route 128 NW
  Square footage
  of expiring
  leases..........       23,215      47,100     119,789     126,239     220,052      56,648           0      60,093      90,000
  Percentage of
  total rentable
  sq. ft..........         2.49%       5.06%      12.86%      13.55%      23.62%       6.08%       0.00%       6.45%       9.66%
  Annualized Rent
  (2).............   $  430,779  $  921,138  $2,162,633  $2,770,938  $4,323,315  $1,314,183  $        0  $1,382,139  $1,590,814
  No. of tenants
  whose leases ex-
  pire............            6          17           9          14          18           6           0           1           1
  Annualized Rent
  per leased sq.
  ft. ............   $    18.56  $    19.56  $    18.05  $    21.95  $    19.65  $    23.20  $     0.00  $    23.20  $    17.68
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $    18.56  $    20.11  $    20.72  $    21.95  $    20.22  $    25.20  $     0.00  $    25.00  $    19.08
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    22.95
 Route 128/Massa-
 chusetts Turnpike
  Square footage
  of expiring
  leases..........       24,935      31,826      55,869      84,276      99,406       4,218           0           0           0
  Percentage of
  total rentable
  sq. ft. ........         8.11%      10.35%      18.18%      27.42%      32.34%       1.37%       0.00%       0.00%       0.00%
  Annualized Rent
  (2).............   $  524,171  $  594,514  $1,112,239  $1,934,159  $2,431,649  $   95,199  $        0  $        0  $        0
  No. of tenants
  whose leases ex-
  pire............            4           9           9           4           4           1           0           0           0
  Annualized Rent
  per leased sq.
  ft. ............   $    21.02  $    18.68  $    19.91  $    22.95  $    24.46  $    22.57  $     0.00  $     0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $    21.02  $    18.68  $    20.15  $    22.95  $    24.46  $    22.57  $     0.00  $     0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    25.89
 Route 128 South
  Square footage
  of expiring
  leases..........        4,500           0           0           0      70,878      93,451           0           0           0
  Percentage of
  total rentable
  sq. ft. ........         2.67%       0.00%       0.00%       0.00%      41.98%      55.35%       0.00%       0.00%       0.00%
  Annualized Rent
  (2).............   $   18,000  $        0  $        0  $        0  $1,579,979  $1,669,261  $        0  $        0  $        0
  No. of tenants
  whose leases ex-
  pire............            1           0           0           0           1           1           0           0           0
  Annualized Rent
  per leased sq.
  ft. ............   $     4.00  $     0.00  $     0.00  $     0.00  $    22.29  $    17.86  $     0.00  $     0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     4.00  $     0.00  $     0.00  $     0.00  $    22.29  $    19.92  $     0.00  $     0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    22.00
 GREATER WASHING-
 TON, D.C.
 Southwest Wash-
 ington, D.C.
  Square footage
  of expiring
  leases..........       24,041      16,045      36,148      67,852      48,112       7,687      54,717      52,838           0
  Percentage of
  total rentable
  sq. ft. ........         1.54%       1.03%       2.32%       4.35%       3.08%       0.49%       3.51%       3.39%       0.00%
  Annualized Rent
  (2).............   $  749,173  $  488,370  $1,189,009  $2,369,016  $1,577,443  $  203,611  $1,758,113  $1,925,201  $        0
  No. of tenants
  whose leases ex-
  pire............            5           8           5          10           7           5           2           1           0
  Annualized Rent
  per leased sq.
  ft. ............   $    31.16  $    30.44  $    32.89  $    34.91  $    32.79  $    26.49  $    32.13  $    36.44  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $    38.91  $    32.81       33.20  $    35.41  $    33.72  $    29.60  $    33.46  $    44.94  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    37.19
 West End Washing-
 ton, D.C.
  Square footage
  of expiring
  leases..........            0           0       3,150           0      39,651           0           0           0           0
  Percentage of
  total rentable
  sq. ft. ........         0.00%       0.00%       1.12%       0.00%      14.16%       0.00%       0.00%       0.00%       0.00%
  Annualized Rent
  (2).............   $        0  $        0  $   88,200  $        0  $1,149,879  $        0  $        0  $        0  $        0
  No. of tenants
  whose leases ex-
  pire............            0           0           1           0           1           0           0           0           0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $     0.00  $    28.00  $     0.00  $    29.00  $     0.00  $     0.00  $     0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (2)....   $     0.00  $     0.00  $    29.00  $     0.00  $    30.83  $     0.00  $     0.00  $     0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    32.00
<CAPTION>
 CLASS A OFFICE                     2007 &
 BUILDINGS              2006        BEYOND
 --------------      ------------ ------------
 <S>                 <C>          <C>
 GREATER BOSTON
 (1)
 East Cambridge
  Square footage
  of expiring
  leases..........        21,519       46,524
  Percentage of
  total rentable
  sq. ft..........          3.88%        8.38%
  Annualized Rent
  (2).............   $   587,469  $   863,826
  No. of tenants
  whose leases ex-
  pire............             1            1
  Annualized Rent
  per leased sq.
  ft. ............   $     27.30  $     18.57
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     32.29  $     21.03
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 Route 128 NW
  Square footage
  of expiring
  leases..........       162,700            0
  Percentage of
  total rentable
  sq. ft..........         17.47%        0.00%
  Annualized Rent
  (2).............   $ 4,035,648  $         0
  No. of tenants
  whose leases ex-
  pire............             1            0
  Annualized Rent
  per leased sq.
  ft. ............   $     24.80  $      0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     26.60  $      0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 Route 128/Massa-
 chusetts Turnpike
  Square footage
  of expiring
  leases..........             0            0
  Percentage of
  total rentable
  sq. ft. ........          0.00%        0.00%
  Annualized Rent
  (2).............   $         0  $         0
  No. of tenants
  whose leases ex-
  pire............             0            0
  Annualized Rent
  per leased sq.
  ft. ............   $      0.00  $      0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $      0.00  $      0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 Route 128 South
  Square footage
  of expiring
  leases..........             0            0
  Percentage of
  total rentable
  sq. ft. ........          0.00%        0.00%
  Annualized Rent
  (2).............   $         0  $         0
  No. of tenants
  whose leases ex-
  pire............             0            0
  Annualized Rent
  per leased sq.
  ft. ............   $      0.00  $      0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $      0.00  $      0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 GREATER WASHING-
 TON, D.C.
 Southwest Wash-
 ington, D.C.
  Square footage
  of expiring
  leases..........       331,518      882,092
  Percentage of
  total rentable
  sq. ft. ........         21.24%       56.51%
  Annualized Rent
  (2).............   $12,659,802  $30,254,535
  No. of tenants
  whose leases ex-
  pire............             1            8
  Annualized Rent
  per leased sq.
  ft. ............   $     38.19  $     34.30
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     39.21  $     38.75
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 West End Washing-
 ton, D.C.
  Square footage
  of expiring
  leases..........       204,154       33,110
  Percentage of
  total rentable
  sq. ft. ........         72.90%       11.82%
  Annualized Rent
  (2).............   $10,801,933  $   871,430
  No. of tenants
  whose leases ex-
  pire............             1            1
  Annualized Rent
  per leased sq.
  ft. ............   $     52.91  $     26.32
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (2)....   $     63.05  $     38.42
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
</TABLE>
 
 
                                       49
<PAGE>
 
<TABLE>
<CAPTION>
                        1997        1998        1999         2000         2001         2002         2003         2004
                     ----------  ----------  -----------  -----------  -----------  -----------  -----------  ----------
 <S>                 <C>         <C>         <C>          <C>          <C>          <C>          <C>          <C>
 MONTGOMERY COUN-
 TY, MD
  Square footage
  of expiring
  leases..........       18,844      93,467       68,949      133,782       43,375      206,281            0      19,789
  Percentage of
  total rentable
  sq. ft. ........         2.35%      11.65%        8.60%       16.68%        5.41%       25.72%        0.00%       2.47%
  Annualized Rent
  (2).............   $  437,770  $1,928,771  $ 1,473,758  $ 2,605,370  $   953,792  $ 4,669,581  $         0  $  408,733
  No. of tenants
  whose leases ex-
  pire............            5          11           10           17            7           10            0           2
  Annualized Rent
  per leased sq.
  t. .............   $    23.23  $    20.64  $     21.37  $     19.47  $     21.99  $     22.64  $      0.00  $    20.65
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    23.23  $    25.22  $     24.94  $     21.26  $     23.04  $     25.35  $      0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    24.78
 BALTIMORE, MD
  Square footage
  of expiring
  leases..........       16,865     106,168        7,390       22,683       27,891       55,570       70,262       8,715
  Percentage of
  total rentable
  sq. ft. ........         2.66%      16.76%        1.17%        3.58%        4.40%        8.77%       11.09%       1.38%
  Annualized Rent
  (2).............   $  344,220  $1,966,932  $   139,956  $   540,312  $   609,144  $ 1,247,868  $ 1,413,876  $  271,488
  No. of tenants
  whose leases ex-
  pire............            5          11            1            3            1            5            2           2
  Annualized Rent
  per leased sq.
  ft. ............   $    20.41  $    18.53  $     18.94  $     23.82  $     21.84  $     22.46  $     20.12  $    31.15
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    20.41  $    18.53  $     18.94  $     24.07  $     21.84  $     25.04  $     20.12  $    35.73
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    27.12
 RICHMOND, VA (5)
  Square footage
  of expiring
  leases..........            0      17,610      117,973       65,517       80,144        3,336       23,855      48,060
  Percentage of
  total rentable
  sq. ft. ........         0.00%       1.96%       13.11%        7.28%        8.91%        0.37%        2.65%       5.34%
  Annualized Rent
  (2).............   $        0  $  268,872  $ 1,788,114  $ 1,482,420  $ 1,578,828  $    63,384  $   565,248  $  907,692
  No. of tenants
  whose leases ex-
  pire............            0           4            8           11           13            1            3           1
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $    15.27  $     15.16  $     22.63  $     19.70  $     19.00  $     23.70  $    18.89
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $    15.27  $     16.12  $     24.66  $     21.84  $     22.23  $     25.23  $    22.93
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    22.00
 MIDTOWN MANHATTAN
 Park Avenue
  Square footage
  of expiring
  leases..........       48,367      37,113          350       72,792       78,421      403,520       47,061       6,145
  Percentage of
  total rentable
  sq. ft. ........         2.20%       1.69%         .02%        3.31%        3.57%       18.35%        2.14%        .28%
  Annualized Rent
  (2).............   $2,784,701  $1,559,480  $    35,494  $ 3,769,144  $ 3,855,416  $21,959,975  $ 2,569,231  $  462,266
  No. of tenants
  whose leases ex-
  pire............            4           9            1           12            6           12            8           2
  Annualized Rent
  per leased sq.
  ft. ............   $    57.57  $    42.02  $    101.41  $     51.78  $     49.16  $     54.42  $     54.59  $    75.23
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    57.57  $    42.02  $    107.37  $     51.69  $     49.47  $     57.36  $     60.79  $    79.25
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    44.45
 East side
  Square footage
  of expiring
  leases..........            0         435       65,901            0        2,768      436,875      151,435       4,150
  Percentage of
  total rentable
  sq. ft. ........            0%       0.06%        9.67%        0.00%        0.41%       64.09%       22.22%       0.61%
  Annualized Rent
  (2).............   $           $   24,996  $ 2,038,596  $         0  $   267,528  $20,987,268  $ 4,375,752  $  139,800
  Percentage of
  Annualized
  Rent............         0.00%       0.09%        7.06%        0.00%        0.93%       72.68%       15.15%       0.48%
  No. of tenants
  whose leases ex-
  pire............                        1            3            0            1            3            5           2
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $    57.46  $     30.93  $      0.00  $     96.65  $     48.04  $     28.90  $    33.69
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $    57.46  $     31.06  $      0.00  $    107.22  $     49.18  $     32.82  $    37.61
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    43.71
 TOTAL CLASS A OF-
 FICE BUILDINGS
  Square footage
  of expiring
  leases..........      217,941     454,927      537,009      790,825      713,610    1,273,945      382,167     199,790
  Percentage of
  total rentable
  sq. ft. ........         2.41%       5.03%        5.93%        8.74%        7.88%       14.08%        4.22%       2.21%
  Annualized Rent
  (2).............   $6,965,084  $9,431,360  $11,541,227  $22,176,201  $18,412,671  $52,388,382  $11,451,834  $5,497,319
  No. of tenants
  whose leases ex-
  pire............           37          15           55           74           60           45           23          11
  Annualized Rent
  per leased sq.
  ft. ............   $    30.73  $    20.73  $     21.49  $     28.04  $     25.80  $     41.12  $     29.97  $    27.52
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    32.18  $    25.26  $     23.14  $     28.63  $     26.55  $     43.38  $     33.29  $    32.00
  ompany Quoted
  Rental Rate per
  sq. ft. (4).....   $    33.33
<CAPTION>
                                                2007 &
                        2005        2006        BEYOND
                     ----------- ------------ ------------
 <S>                 <C>         <C>          <C>
 MONTGOMERY COUN-
 TY, MD
  Square footage
  of expiring
  leases..........       36,081      152,978        4,664
  Percentage of
  total rentable
  sq. ft. ........         4.50%       19.07%        0.58%
  Annualized Rent
  (2).............   $  831,775  $ 3,458,413  $    57,624
  No. of tenants
  whose leases ex-
  pire............            2            3            1
  Annualized Rent
  per leased sq.
  t. .............   $    23.05  $     22.61  $     12.36
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    28.92  $     27.34  $     12.87
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 BALTIMORE, MD
  Square footage
  of expiring
  leases..........       33,793      228,864       42,409
  Percentage of
  total rentable
  sq. ft. ........         5.33%       36.13%        6.69%
  Annualized Rent
  (2).............   $  838,548  $ 6,330,204  $ 1,521,876
  No. of tenants
  whose leases ex-
  pire............            1            2            2
  Annualized Rent
  per leased sq.
  ft. ............   $    24.81  $     27.66  $     35.89
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    28.81  $     31.14  $     38.42
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 RICHMOND, VA (5)
  Square footage
  of expiring
  leases..........      202,919      289,112       22,567
  Percentage of
  total rentable
  sq. ft. ........        22.55%       32.13%        2.51%
  Annualized Rent
  (2).............   $4,021,257  $ 6,735,248  $   152,196
  No. of tenants
  whose leases ex-
  pire............            1            1            2
  Annualized Rent
  per leased sq.
  ft. ............   $    19.82  $     23.30  $      6.74
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    22.52  $     26.50  $      6.74
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 MIDTOWN MANHATTAN
 Park Avenue
  Square footage
  of expiring
  leases..........       33,543       21,344    1,207,788
  Percentage of
  total rentable
  sq. ft. ........         1.53%         .97%       54.93%
  Annualized Rent
  (2).............   $1,667,072  $   888,181  $53,752,917
  No. of tenants
  whose leases ex-
  pire............            5            2           18
  Annualized Rent
  per leased sq.
  ft. ............   $    49.70  $     41.61  $     44.51
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    52.95  $     45.35  $     47.53
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 East side
  Square footage
  of expiring
  leases..........        9,790        1,075        9,115
  Percentage of
  total rentable
  sq. ft. ........         1.44%        0.16%        1.34%
  Annualized Rent
  (2).............   $  322,356  $    55,764  $   662,328
  Percentage of
  Annualized
  Rent............         1.12%        0.19%        2.29%
  No. of tenants
  whose leases ex-
  pire............            3            1            3
  Annualized Rent
  per leased sq.
  ft. ............   $    32.93  $     51.87  $     77.98
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    37.24  $     64.13  $     94.53
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 TOTAL CLASS A OF-
 FICE BUILDINGS
  Square footage
  of expiring
  leases..........      406,126    1,413,264    2,248,269
  Percentage of
  total rentable
  sq. ft. ........         4.49%       15.62%       24.84%
  Annualized Rent
  (2).............   $9,271,822  $45,552,662  $87,869,396
  No. of tenants
  whose leases ex-
  pire............           13           13           36
  Annualized Rent
  per leased sq.
  ft. ............   $    22.83  $     32.23  $     39.20
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    25.72  $     36.02  $     42.93
  ompany Quoted
  Rental Rate per
  sq. ft. (4).....
</TABLE>
 
 
                                       50
<PAGE>
 
<TABLE>
<CAPTION>
<CAPTION>              1997       1998        1999        2000       2001       2002        2003       2004    2005      2006
                     --2007 &------  ----------  ----------  ----------  --------  ----------  ----------  --------  -----  ------
                       BEYOND
                     -----------
R&D PROPERTIES
 <S>                 <C>       <C>         <C>         <C>         <C>       <C>         <C>         <C>       <C>    <C>
 GREATER BOSTON
 East Cambridge
  Square footage
  of expiring
  leases..........          0           0           0           0         0           0      67,362         0      0           0
  Percentage of
  total rentable
  sq. ft. ........       0.00%       0.00%       0.00%       0.00%     0.00%       0.00%     100.00%     0.00%  0.00%       0.00%
  Annualized Rent
  (2).............   $      0  $        0  $        0  $        0  $      0  $        0  $1,366,714  $      0  $   0  $        0
  No. of tenants
  whose leases ex-
  pire............          0           0           0           0         0           0           1         0      0           0
  Annualized Rent
  per leased sq.
  ft. ............   $   0.00  $     0.00  $     0.00  $     0.00  $   0.00  $     0.00  $    20.29  $   0.00  $0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $   0.00  $     0.00  $     0.00  $     0.00  $   0.00  $     0.00  $    23.73  $   0.00  $0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $  25.00
 Route 128 NW
  Square footage
  of expiring
  leases..........          0           0      50,000     133,000         0      94,140      50,704         0      0     150,000
  Percentage of
  total rentable
  sq. ft. ........       0.00%       0.00%      10.46%      27.83%     0.00%      19.70%      10.61%     0.00%  0.00%      31.39%
  Annualized Rent
  (2).............   $      0  $        0  $  352,852  $1,294,196  $      0  $  875,976  $  563,217  $      0  $   0  $1,569,948
  No. of tenants
  whose leases ex-
  pire............          0           0           1           2         0           2           1         0      0           1
  Annualized Rent
  per leased sq.
  ft. ............   $   0.00  $     0.00  $     7.06  $     9.73  $   0.00  $     9.31  $    11.11  $   0.00  $0.00  $    10.47
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $   0.00  $     0.00  $     7.06  $     9.73  $   0.00  $     9.62  $    11.11  $   0.00  $0.00  $    10.47
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $   9.00
 GREATER WASHING-
 TON, D.C.
 Fairfax County,
 VA
  Square footage
  of expiring
  leases..........     37,158     137,301      47,001     213,800    41,793      58,462           0    17,641      0           0
  Percentage of
  total rentable
  sq. ft. ........       4.99%      18.42%       6.31%      28.68%     5.61%       7.84%       0.00%     2.37%  0.00%       0.00%
  Annualized Rent
  (2).............   $291,232  $1,140,785  $  660,950  $2,180,652  $590,478  $  964,775  $        0  $243,701  $   0  $        0
  No. of tenants
  whose leases ex-
  pire............          2           7           1           7         2           2           0         2      0           0
  Annualized Rent
  per leased sq.
  ft..............   $   7.84  $     8.31  $    14.06  $    10.20  $  14.13  $    16.58  $     0.00  $  13.80  $0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $   7.84  $     8.31  $    14.82  $    10.35  $  14.85  $    17.40  $     0.00  $  17.38  $0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $  12.32
 GREATER SAN FRAN-
 CISCO
  Square footage
  of expiring
  leases..........      8,930      27,450      38,593      31,519    10,000      13,200       2,000         0      0           0
  Percentage of
  total rentable
  sq. ft. ........       6.18%      19.00%      26.71%      21.82%     6.92%       9.14%       1.38%     0.00%  0.00%       0.00%
  Annualized Rent
  (2).............   $ 87,097  $  227,088  $  301,578  $  251,798  $ 74,340  $  105,120  $   14,160  $      0  $   0  $        0
  No. of tenants
  whose leases ex-
  pire............          7          12          15          11         4           5           1         0      0           0
  Annualized Rent
  per leased sq.
  ft..............   $   9.75  $     8.27  $     7.81  $     7.99  $   7.43  $     7.96  $     7.08  $   0.00  $0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $   9.75  $     8.27  $     7.81  $     7.99  $   7.43  $     7.96  $     7.08  $   0.00  $0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $   7.80
 TOTAL R&D PROPER-
 TIES
  Square footage
  of expiring
  leases..........     46,088     164,751     135,591     378,319    51,793     165,802     120,066    17,641      0     150,000
  Percentage of
  total rentable
  sq. ft. ........       3.21%      11.48%       9.45%      26.36%     3.61%      11.55%       8.37%     1.23%  0.00%      10.45%
  Annualized Rent
  (2).............   $378,329  $1,387,873  $1,315,380  $3,726,646  $664,818  $1,945,873  $1,944,091  $243,701  $   0  $1,569,949
  No. of tenants
  whose leases ex-
  pire............          9          19          17          20         6           9           3         2      0           3
  Annualized Rent
  per leased sq.
  ft..............   $   8.21  $     8.30  $     9.70  $     9.85  $  12.84  $    11.74  $    16.19  $  13.81  $0.00  $    10.47
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $   8.21  $     8.30  $     9.96  $     9.94  $  13.42       12.23  $    18.12  $  17.38  $0.00  $    10.47
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $  11.36
 <S>                 <C>
 GREATER BOSTON
 East Cambridge
  Square footage
  of expiring
  leases..........            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%
  Annualized Rent
  (2).............   $        0
  No. of tenants
  whose leases ex-
  pire............            0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 Route 128 NW
  Square footage
  of expiring
  leases..........            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%
  Annualized Rent
  (2).............   $        0
  No. of tenants
  whose leases ex-
  pire............            0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 GREATER WASHING-
 TON, D.C.
 Fairfax County,
 VA
  Square footage
  of expiring
  leases..........      115,148
  Percentage of
  total rentable
  sq. ft. ........        15.45%
  Annualized Rent
  (2).............    1,670,627
  No. of tenants
  whose leases ex-
  pire............            2
  Annualized Rent
  per leased sq.
  ft..............   $    14.51
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $    14.51
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 GREATER SAN FRAN-
 CISCO
  Square footage
  of expiring
  leases..........            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%
  Annualized Rent
  (2).............   $        0
  No. of tenants
  whose leases ex-
  pire............            0
  Annualized Rent
  per leased sq.
  ft..............   $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 TOTAL R&D PROPER-
 TIES
  Square footage
  of expiring
  leases..........      115,148
  Percentage of
  total rentable
  sq. ft. ........         8.02%
  Annualized Rent
  (2).............   $1,670,627
  No. of tenants
  whose leases ex-
  pire............            2
  Annualized Rent
  per leased sq.
  ft..............   $    14.50
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $    14.50
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 
INDUSTRIAL PROPERTIES
(MARKET/SUBMARKET)
 GREATER BOSTON
 Route 128/Massa-
 chusetts Turnpike
  Square footage
  of expiring
  leases..........          0           0      23,904      67,216    10,829           0     128,105         0      0           0
  Percentage of
  total rentable
  sq. ft. ........       0.00%       0.00%       9.67%      27.18%     4.38%       0.00%      51.80%     0.00%  0.00%       0.00%
  Annualized Rent
  (2).............   $      0  $        0  $  120,989  $  663,355  $131,769  $        0  $  733,031  $      0  $   0  $        0
  No. of tenants
  whose leases ex-
  pire............          0           0           1           1         1           0           1         0      0           0
  Annualized Rent
  per leased sq.
  ft.  ...........   $   0.00  $     0.00  $     5.06  $     9.87  $  12.17  $     0.00  $     5.72  $   0.00  $0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $   0.00  $     0.00  $     5.06  $     9.87  $  12.17  $     0.00  $     6.47  $   0.00  $0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $   8.84
 GREATER BOSTON
 Route 128/Massa-
 chusetts Turnpike
  Square footage
  of expiring
  leases..........            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%
  Annualized Rent
  (2).............   $        0
  No. of tenants
  whose leases ex-
  pire............            0
  Annualized Rent
  per leased sq.
  ft.  ...........   $     0.00
  Annualized Rent
  per leased sq.
  ft.
  w/future step-
  ups (3).........   $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
</TABLE>
 
 
                                       51
<PAGE>
 
<TABLE>
<CAPTION>
                        1997        1998         1999         2000         2001         2002         2003         2004
                     ----------  -----------  -----------  -----------  -----------  -----------  -----------  ----------
 <S>                 <C>         <C>          <C>          <C>          <C>          <C>          <C>          <C>
 GREATER WASHING-
 TON, D.C.
 Prince George's
 County, MD
  Square footage
  of expiring
  leases..........       20,500      116,358       34,863       21,064            0            0            0           0
  Percentage of
  total rentable
  sq. ft. ........         8.66%       49.15%       14.73%        8.90%        0.00%        0.00%        0.00%       0.00%
  Annualized Rent
  (2).............   $  253,812  $   819,640  $   307,976  $   143,499  $         0  $         0  $         0  $        0
  No. of tenants
  whose leases ex-
  pire............            1            4            1            1            0            0            0           0
  Annualized Rent
  per leased sq.
  ft. ............   $     5.75  $      8.21  $      8.83  $      6.81  $      0.00  $      0.00  $      0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     5.75  $      8.21  $      8.83  $      6.81  $      0.00  $      0.00  $      0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $     5.34
 GREATER SAN FRAN-
 CISCO
  Square footage
  of expiring
  leases..........            0       20,000       40,000            0       60,000            0            0     160,213
  Percentage of
  total rentable
  sq. ft. ........         0.00%        7.12%       14.23%        0.00%       21.35%        0.00%        0.00%      57.02%
  Annualized Rent
  (2).............   $        0  $   114,949  $   237,870  $         0  $   234,000  $         0  $         0  $  442,188
  No. of tenants
  whose leases ex-
  pire............            0            1            1            0            1            0            0           1
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $      5.75  $      5.95  $      0.00  $      3.90  $      0.00  $      0.00  $     2.76
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $      5.75  $      6.31  $      0.00  $      3.90  $      0.00  $      0.00  $     2.76
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $     7.92
 BUCKS COUNTY, PA
  Square footage
  of expiring
  leases..........            0      161,000            0            0            0            0            0           0
  Percentage of
  total rentable
  sq. ft. ........         0.00%      100.00%        0.00%        0.00%        0.00%        0.00%        0.00%       0.00%
  Annualized Rent
  (2).............   $        0  $   868,699  $         0  $         0  $         0  $         0  $         0  $        0
  No. of tenants
  whose leases ex-
  pire............            0            1            0            0            0            0            0           0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $      5.40  $      0.00  $      0.00  $      0.00  $      0.00  $      0.00  $     0.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $      5.40  $      0.00  $      0.00  $      0.00  $      0.00  $      0.00  $     0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $     5.40
 TOTAL INDUSTRIAL
 PROPERTIES
  Square footage
  of expiring
  leases..........       20,500      297,358       98,767       88,280       70,629            0      128,105     160,213
  Percentage of
  total rentable
  sq. ft. ........         3.54%       32.11%       10.67%        9.53%        7.65%        0.00%       13.83%      17.30%
  Annualized Rent
  (2).............   $  117,870  $ 1,939,230  $   666,855  $   806,854  $   365,769  $         0  $   733,031  $  442,188
  No. of tenants
  whose leases ex-
  pire............            1            6            3            2            2            0            1           1
  Annualized Rent
  per leased sq.
  ft. ............   $     5.75  $      6.52  $      6.75  $      9.14  $      5.16  $      0.00  $      5.72  $     2.76
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     5.75  $      6.52  $      6.90  $      9.14  $      5.16  $      0.00  $      6.47  $     2.76
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $     6.13
 TOTAL OFFICE AND
 INDUSTRIAL PROP-
 ERTIES
  Square footage
  of expiring
  leases (6)......      284,532      917,036      771,367    1,257,424      836,232    1,439,747      630,338     337,644
  Percentage of
  total rentable
  sq. ft..........         2.49%        8.04%        6.76%       11.02%        7.33%       12.62%        5.52%       3.31%
  Annualized Rent
  (2).............   $7,193,947  $12,738,463  $13,523,462  $26,709,701  $19,443,258  $54,334,255  $14,128,956  $6,183,208
  No. of tenants
  whose leases ex-
  pire............           47          100           75           96           68           54           27          14
  Annualized Rent
  per leased sq.
  ft. ............   $    25.28  $     13.89  $     17.53  $     21.24  $     23.25  $     37.74  $     22.41  $    16.37
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    26.93  $     16.14  $     18.74  $     21.29  $     23.92  $     39.79  $     24.95  $    18.91
  Company Quoted
  Rental Rate per
  sq. ft. (4).....   $    28.36
<CAPTION>
                                                2007 &
                        2005        2006        BEYOND
                     ----------- ------------ ------------
 <S>                 <C>         <C>          <C>
 GREATER WASHING-
 TON, D.C.
 Prince George's
 County, MD
  Square footage
  of expiring
  leases..........            0            0            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%        0.00%        0.00%
  Annualized Rent
  (2).............   $        0  $         0  $         0
  No. of tenants
  whose leases ex-
  pire............            0            0            0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $      0.00  $      0.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $      0.00  $      0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 GREATER SAN FRAN-
 CISCO
  Square footage
  of expiring
  leases..........            0            0            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%        0.00%        0.00%
  Annualized Rent
  (2).............   $        0  $         0  $         0
  No. of tenants
  whose leases ex-
  pire............            0            0            0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $      0.00  $      0.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $      0.00  $      0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 BUCKS COUNTY, PA
  Square footage
  of expiring
  leases..........            0            0            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%        0.00%        0.00%
  Annualized Rent
  (2).............   $        0  $         0  $         0
  No. of tenants
  whose leases ex-
  pire............            0            0            0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $      0.00  $      0.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $      0.00  $      0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 TOTAL INDUSTRIAL
 PROPERTIES
  Square footage
  of expiring
  leases..........            0            0            0
  Percentage of
  total rentable
  sq. ft. ........         0.00%        0.00%        0.00%
  Annualized Rent
  (2).............   $        0  $         0  $         0
  No. of tenants
  whose leases ex-
  pire............            0            0            0
  Annualized Rent
  per leased sq.
  ft. ............   $     0.00  $      0.00  $      0.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $     0.00  $      0.00  $      0.00
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
 TOTAL OFFICE AND
 INDUSTRIAL PROP-
 ERTIES
  Square footage
  of expiring
  leases (6)......      406,126    1,563,264    2,363,446
  Percentage of
  total rentable
  sq. ft..........         3.56%       13.70%       20.71%
  Annualized Rent
  (2).............   $9,271,822  $47,122,611  $89,807,359
  No. of tenants
  whose leases ex-
  pire............           13           16           38
  Annualized Rent
  per leased sq.
  ft. ............   $    22.83  $     30.14  $     38.00
  Annualized Rent
  per leased sq.
  ft. w/future
  step-ups (3)....   $    25.72  $     33.57  $     41.55
  Company Quoted
  Rental Rate per
  sq. ft. (4).....
</TABLE>
- -----
(1)The Company owns one Class A Office Building in the Back Bay submarket of
  Greater Boston. This Property serves as the Company's headquarters. The
  Company is the sole tenant of this building.
(2) Annualized Rent, as used throughout this Prospectus, represents Annualized
    Rent which is the monthly contractual rent under existing leases as of
    September 30, 1997 multiplied by twelve. This amount reflects total rent
    before any rent abatements and includes expense reimbursements, which may
    be estimates as of such date.
(3) Annualized Rent Per Leased Square Foot with Future Step-Ups, represents
    Annualized Rent Per Leased Square Foot as described in footnote (1) above,
    but also reflects contractual increases in monthly base rent that occur
    after September 30, 1997.
(4) Represents weighted average rental rates per square foot quoted by the
    Company as of October 1, 1997, based on total net rentable square feet of
    Company Properties in the submarket. These rates have not been adjusted to
    a full-service equivalent rate in markets in which the Company's rates are
    not quoted on a full-service basis.
(5) The Company has entered into a contract to acquire this Property and
    anticipates a closing date in January 1998.
 
                                       52
<PAGE>
 
HISTORICAL TENANT IMPROVEMENTS AND LEASING COMMISSIONS
 
  The following table sets forth certain historical information regarding
recurring tenant improvement and leasing commission costs for tenants at the
Office and Industrial Properties during the years ending December 31, 1992
through December 31, 1996 and the nine months ended September 30, 1997.
<TABLE>
<CAPTION>
                                                                  NINE MONTHS ENDED
                                                                    SEPTEMBER 30,   WEIGHTED
                           1992    1993    1994    1995    1996         1997        AVERAGE
OFFICE PROPERTIES         ------- ------- ------- ------- ------- ----------------- --------
 Class A Office Buildings
<S>                       <C>     <C>     <C>     <C>     <C>     <C>               <C>
RENEWALS
 Number of leases.......       39      34      30      36      45           43
 Square feet............  298,580 163,008 239,441  78,216 226,941      460,888
 Tenant improvement
  costs per square
  foot..................   $ 1.63  $ 0.47  $ 2.70  $ 0.48  $ 2.80       $ 7.29       $ 3.57
 Leasing commission
  costs per square
  foot..................     0.30    0.26    0.93    1.32    1.67         1.41         1.01
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $ 1.93  $ 0.73  $ 3.63  $ 1.80  $ 4.47       $ 8.70       $ 4.58
                          ======= ======= ======= ======= =======      =======       ======
NEW LEASES
 Number of leases.......       38      43      57      58      60           39
 Square feet............  374,558 288,287 451,018 690,297 782,782      310,533
 Tenant improvement
  costs per square
  foot..................   $10.50  $10.43  $10.53  $ 8.08  $10.33      $ 12.04       $10.04
 Leasing commission
  costs per square
  foot..................     2.06    2.38    2.02    3.59    2.88         3.65         2.84
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $12.56  $12.81  $12.55  $11.67  $13.21      $ 15.69       $12.88
                          ======= ======= ======= ======= =======      =======       ======
TOTAL
 Number of leases.......       77      77      87      94     104           82
 Square feet............  673,138 451,295 690,459 768,513 970,072      771,421
 Tenant improvement
  costs per square
  foot..................   $ 6.57  $ 6.83  $ 7.81  $ 7.30  $ 8.99       $ 9.20       $ 7.93
 Leasing commission
  costs per square
  foot..................     1.28    1.62    1.64    3.36    2.41         2.31         2.18
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $ 7.85  $ 8.45  $ 9.45  $10.66  $11.40      $ 11.51       $10.11
                          ======= ======= ======= ======= =======      =======       ======
 R&D Properties
RENEWALS
 Number of leases.......        7      11       9      10      11           16
 Square feet............   58,400  20,890  49,552  31,492 139,254       91,596
 Tenant improvement
  costs per square
  foot..................   $ 2.73  $ 2.22  $ 0.74  $ 1.35  $ 0.98       $ 0.85       $ 1.28
 Leasing commission
  costs per square
  foot..................     0.12    2.36    0.59    1.12    0.65          .11         0.91
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $ 2.85  $ 4.58  $ 1.33  $ 2.47  $ 1.63       $  .96       $ 2.19
                          ======= ======= ======= ======= =======      =======       ======
NEW LEASES
 Number of leases.......       28      26      20      16      16           17
 Square feet............  126,670 146,067 228,780 145,581 198,442       55,908
 Tenant improvement
  costs per square
  foot..................   $ 3.42  $ 4.02  $ 0.19  $ 7.23  $15.01       $ 4.19       $ 5.93
 Leasing commission
  costs per square
  foot..................     0.84    1.66    0.34    0.75    1.62          .67         0.98
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $ 4.26  $ 5.68  $ 0.53  $ 7.98  $16.63       $ 4.86       $ 6.91
                          ======= ======= ======= ======= =======      =======       ======
TOTAL
 Number of leases.......       35      37      29      26      27           33
 Square feet............  185,070 166,957 276,332 177,073 337,676      147,504
 Tenant improvement
  costs per square
  foot..................   $ 3.21  $ 3.79  $ 0.29  $ 6.18  $ 9.23       $ 2.12       $ 4.52
 Leasing commission
  costs per square
  foot..................     0.61    1.74    0.39    0.81    1.22          .33         0.86
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant
   improvement and
   leasing commission
   costs per square
   foot.................   $ 3.82  $ 5.53  $ 0.68  $ 6.99  $10.45       $ 2.45       $ 5.38
                          ======= ======= ======= ======= =======      =======       ======
<CAPTION>
INDUSTRIAL PROPERTIES
<S>                       <C>     <C>     <C>     <C>     <C>     <C>               <C>
RENEWALS
 Number of leases.......        1       0       2       4       3            1
 Square feet............   13,367       0  13,367  71,283  46,117       32,750
 Tenant improvement
  costs per square
  foot..................   $ 2.27  $ 0.00  $ 0.00  $ 0.00  $ 0.00       $ 0.00       $ 0.17
 Leasing commission
  costs per square
  foot..................     0.00    0.00    0.32    0.06    0.57         0.00         0.20
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $ 2.27  $ 0.00  $ 0.32  $ 0.06  $ 0.57       $ 0.00       $ 0.37
                          ======= ======= ======= ======= =======      =======       ======
NEW LEASES
 Number of leases.......        3       4       4       9       5            2
 Square feet............   31,106 241,500 119,160 237,105  82,031      170,682
 Tenant improvement
  costs per square
  foot..................   $ 1.00  $ 0.12  $ 1.58  $ 0.19  $ 1.09       $ 0.00       $ 0.44
 Leasing commission
  costs per square
  foot..................     1.33    0.16    2.08    1.09    1.25         1.19         1.01
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $ 2.33  $ 0.28  $ 3.66  $ 1.28  $ 2.34       $ 1.19       $ 1.45
                          ======= ======= ======= ======= =======      =======       ======
TOTAL
 Number of leases.......        4       4       6      13       8            3
 Square feet............   44,473 241,500 132,521 308,388 128,148      203,432
 Tenant improvement
  costs per square
  foot..................   $ 1.38  $ 0.12  $ 1.42  $ 0.15  $ 0.70       $ 0.00       $ 0.39
 Leasing commission
  costs per square
  foot..................     0.93    0.16    1.90    0.85    1.01         1.00         0.87
                          ------- ------- ------- ------- -------      -------       ------
  Total tenant improve-
   ment and leasing com-
   mission costs per
   square foot..........   $ 2.31  $ 0.28  $ 3.32  $ 1.00  $ 1.71       $ 1.00       $ 1.26
                          ======= ======= ======= ======= =======      =======       ======
</TABLE>
 
                                      53
<PAGE>
 
<TABLE>
<CAPTION>
                                                                       NINE MONTHS
                                                                          ENDED
                                                                        SEPTEMBER  WEIGHTED
TOTAL OFFICE AND          1992    1993     1994      1995      1996     30, 1997   AVERAGE
INDUSTRIAL PROPERTIES    ------- ------- --------- --------- --------- ----------- --------
<S>                      <C>     <C>     <C>       <C>       <C>       <C>         <C>
RENEWALS
 Number of leases(1)...       47      45        41        50        59         60
 Square feet(1)........  370,347 183,898   302,360   180,991   412,312    585,234
 Tenant improvement
  costs per square
  foot.................    $1.83   $0.67     $2.26     $0.44     $1.87      $5.87    $2.84
 Leasing commission
  costs per square
  foot.................     0.26    0.50      0.85      0.79      1.20       1.13     0.85
                         ------- ------- --------- --------- ---------  ---------   ------
  Total tenant
   improvement and
   leasing commission
   costs per square
   foot................    $2.09   $1.17     $3.11     $1.23     $3.07      $7.00    $3.69
                         ======= ======= ========= ========= =========  =========   ======
NEW LEASES
 Number of leases(2)...       69      73        81        83        81         58
 Square feet(2)........  532,334 675,854   796,958 1,072,983 1,063,235    537,123
 Tenant improvement
  costs per square
  foot.................    $8.26   $5.36     $6.25     $6.22    $10.49      $7.40    $7.44
 Leasing commission
  costs per square
  foot.................     1.73    1.43      1.55      2.65      2.52       2.56     2.14
                         ------- ------- --------- --------- ---------  ---------   ------
  Total tenant
   improvement and
   leasing commission
   costs per square
   foot................    $9.99   $6.79     $7.80     $8.87    $13.01      $9.96    $9.58
                         ======= ======= ========= ========= =========  =========   ======
TOTAL
 Number of leases......      116     118       122       133       140        118
 Square feet...........  902,681 859,752 1,099,318 1,253,974 1,475,547  1,122,357
 Tenant improvement
  costs per square
  foot.................    $5.62   $4.35     $5.15     $5.39     $8.09      $6.60    $6.04
 Leasing commission
  costs per square
  foot.................     1.12    1.23      1.36      2.38      2.16       1.81     1.75
                         ------- ------- --------- --------- ---------  ---------   ------
  Total tenant
   improvement and
   leasing commission
   costs per square
   foot................    $6.74   $5.58     $6.51     $7.77    $10.25      $8.41    $7.79
                         ======= ======= ========= ========= =========  =========   ======
</TABLE>
- --------
(1) Does not include retained tenants that have relocated to new space or
    expanded into new space.
(2) Includes retained tenants that have relocated or expanded into new space.
 
HISTORICAL CAPITAL EXPENDITURES
 
  For the period from October 1, 1997 through December 31, 1997 and for
calendar year 1998, the Company projects the cost of building improvements and
equipment upgrades (excluding the costs of tenant improvements) at the
Properties (excluding the Hotel Properties and the Garage Property) to be
approximately $0.5 million and $2.5 million (or $0.20 per square foot)
respectively, which cost is expected to be paid from operating cash flows.
These projected capital expenditures are estimated based on historical capital
expenditures at the Company's Properties for the years 1992 through 1996 and
the nine months ended September 30, 1997. Historical capital expenditures at
Properties acquired by the Company for periods prior to such acquisition have
not been included in the determination of projected capital expenditures.
 
  The following table sets forth certain historical information regarding
recurring capital expenditures at the Office and Industrial Properties for the
years ending December 31, 1992 through December 31, 1996 and the nine months
ended September 30, 1997.
 
<TABLE>
<CAPTION>
                                                             NINE MONTHS
                              YEAR ENDED DECEMBER 31,           ENDED
                         ---------------------------------- SEPTEMBER 30, ANNUAL
                          1992   1993   1994   1995   1996      1997      AVERAGE
                         ------ ------ ------ ------ ------ ------------- -------
                                          (IN THOUSANDS)
<S>                      <C>    <C>    <C>    <C>    <C>    <C>           <C>
Recurring capital
 expenditures........... $1,425 $1,547 $1,812 $1,618 $1,803    $1,019     $1,594
</TABLE>
 
  The following table sets forth historical capital expenditures at the Hotel
Properties incurred during the years ending December 31, 1992 through December
31, 1996 and the nine months ended September 30, 1997. The average cost is
presented below:
 
<TABLE>
<CAPTION>
                                                           NINE MONTHS
                             YEAR ENDED DECEMBER 31,          ENDED
                         -------------------------------- SEPTEMBER 30, ANNUAL
                          1992  1993  1994   1995   1996      1997      AVERAGE
                         ------ ---- ------ ------ ------ ------------- -------
                                         (IN THOUSANDS)
<S>                      <C>    <C>  <C>    <C>    <C>    <C>           <C>
Hotel improvements,
 equipment upgrades and
 replacements..........  $3,182 $836 $1,917 $4,420 $3,041    $1,242     $2,509
</TABLE>
 
  As of October 10, 1997, the Hotel Properties had an escrow balance in the
amount of $6.0 million.
 
TENANT RELATIONS
 
  The Company believes that its relationship with tenants contributes in large
part to its success in attracting, expanding and retaining its quality and
diverse tenant base. The Company strives to develop and maintain good
relationships with tenants through its active management style and by being
responsive to individual tenants'
 
                                      54
<PAGE>
 
needs. The Company services tenants primarily through its on site,
professional management staff. Management believes that tenant satisfaction
fosters long-term tenant relationships and creates expansion opportunities,
which, in turn, enhance the Company's ability to maintain and increase
occupancy rates.
 
HISTORICAL LEASE RENEWALS
 
  The following table sets forth certain historical information regarding
tenants at the Properties who renewed an existing lease at or prior to the
expiration of the existing lease:
 
<TABLE>
<CAPTION>
                                                                                        TOTAL/
                                                                     FOR THE NINE      WEIGHTED
                                                                     MONTHS ENDED      AVERAGE
                           1993      1994       1995      1996    SEPTEMBER 30, 1977 1993-9/30/97
                          -------  ---------  ---------  -------  ------------------ ------------
<S>                       <C>      <C>        <C>        <C>      <C>                <C>
Number of leases expired
 during calendar year...       95        105         95      104           106              100
Aggregate net rentable
 square footage of
 expiring leases........  916,164  1,395,922  1,008,579  892,486       856,395        1,053,288
Number of lease
 renewals...............       49         45         53       62            63               52
Aggregate net rentable
 square footage of lease
 renewals...............  336,156    452,885    444,229  451,504       577,308          421,194
Percentage of leases
 renewed................     51.6%      42.9%      55.8%    59.6%         59.4%            52.0%
Percentage of expiring
 net rentable square
 footage renewed........     36.7%      32.4%      44.1%    50.6%         67.4%            40.0%
</TABLE>
 
                             THE OFFICE PROPERTIES
 
  The Office Properties consist of the 43 Class A Office Buildings (including
five Office Development Properties and one property to be acquired by the
Company subsequent to the completion of this Offering) and the 27 R&D
Properties. The Company's 43 Class A Office Buildings contain approximately
10.2 million net rentable square feet in urban and suburban settings in
Greater Boston, Greater Washington, D.C., midtown Manhattan, Baltimore,
Maryland and, upon completion of the acquisition of Riverfront Plaza,
Richmond, Virginia. As of September 30, 1997, the Class A Office Buildings
(excluding the Office Development Properties) had an occupancy rate of 96%.
Forty-two of the Class A Office Buildings, including Office Development
Properties (consisting of approximately 10.1 million rentable square feet),
have been built or substantially redeveloped since 1980.
 
  The 27 R&D Properties contain approximately 1.6 million net rentable square
feet and consist primarily of suburban properties located in the Springfield,
Virginia submarket of Greater Washington, D.C. and the East Cambridge and
Route 128 Northwest submarkets of Greater Boston. Seventeen of the R&D
Properties, totaling approximately 1.4 million net rentable square feet, have
been built or substantially renovated since 1980. As of September 30, 1997,
the R&D Properties had an occupancy rate of 94%.
 
  Management believes that the location and quality of construction of the
Office Properties, as well as the Company's reputation for providing a high
level of tenant service, have enabled the Company to attract and retain a
diverse tenant base. As of September 30, 1997, the Office Properties were
leased to 484 tenants, and no single tenant, other than the GSA, whose lease
obligations are full faith and credit obligations of the United States
government, accounted for more than approximately 7.3% of the aggregate
Annualized Rent of the Company's Office and Industrial Properties.
 
GREATER BOSTON OFFICE MARKET
 
  Greater Boston, the seventh largest metropolitan area in the United States,
has a strong and diverse economy and is a nationally recognized center of
higher education, technological entrepreneurship, investment management,
health care and research and development. Economic growth during the 1990's
substantially increased demand for office space while there has been little
addition to the total office space supply of approximately 103 million square
feet in this market area defined by the cities and towns within or adjacent to
the US I-495 outer circumferential highway. This has resulted in substantial
absorption of available space
 
                                      55
<PAGE>
 
accompanied by rising rents. Between 1992 and September 30, 1997, according to
information provided by Spaulding & Slye, the office space availability rate
in this market (space currently available direct from landlord or by sublease,
or scheduled to become available within 12 months) declined from 16.0% to 6.9%
while average quoted rents increased 37.4%, and the Direct Vacancy Rate was
only 3.9% at September 30, 1997. During this same 1992 through September 30,
1997 period office space supply grew by only 2.1% (2,175,000 square feet) and
there was net absorption of approximately 12.2 million square feet at a
relatively steady rate (approximately 1.8 million square feet in 1992, 2.2
million square feet annually from 1993 through 1995 2.3 million square feet in
1996, and 1.4 million square feet during the first nine months of 1997).
 
  The Company expects this positive office space demand-supply relationship to
further strengthen due to the growing economy and anticipated increases in
population and employment. Between 1996 and 2001 the population of
metropolitan Boston is expected to grow by approximately 231,000, with an
increase in total employment of approximately 106,000, an increase in office
employment alone of approximately 56,000, and substantial resulting need for
office space. The Company believes that this expected growth in demand will
result in further increases in rental rates in Greater Boston generally and
particularly in the three submarkets in which the Company's Greater Boston
office properties are concentrated. These three submarkets are already
experiencing low vacancy rates and have substantial limitations on potential
increases in supply because of limited sites available for development and
significant regulatory obstacles to development. These submarkets are East
Cambridge, a market area directly across the Charles River from downtown
Boston that includes MIT, and two submarkets adjacent to each other along the
west/northwest quadrant of "Route 128," the inner circumferential highway
known for its concentration of high-technology firms. According to Spaulding &
Slye, the Direct Vacancy rates at September 30, 1997 of these submarkets, and
their supply sizes, were as follows: 1.2% Direct Vacancy in the 6.5 million
square feet East Cambridge submarket; 1.8% Direct Vacancy in the 11.5 million
square feet Route 128/West submarket; and 4.2% Direct Vacancy in the 7.4
million square feet Route 128 Northwest submarket.
 
  The Greater Boston economy is strong and competitive due to its diversity.
The Greater Boston market is characterized by four core industry groups: (i)
information technology, (ii) financial services, (iii) health care, and (iv)
research and development, including both academic and commercial research.
Local businesses within these industry groups successfully compete both
nationally and internationally. Growth in the area has centered around the
emergence of a large number of small to medium-sized companies within these
industry groups.
 
  Over 60 colleges and universities are located within the Greater Boston
area, attracting to the region in excess of 240,000 students from both within
the United States and abroad. These colleges and universities, including
Harvard University, MIT, Tufts University, Brandeis University, Boston
College, Northeastern University and Boston University, contribute $5 billion
annually to the local economy and draw a diverse and talented student
population to the region. Many graduates remain in the area, providing local
businesses with a highly-educated, top-quality workforce.
 
  According to the Massachusetts Department of Employment and Training, the
Boston area's employment base has expanded by 22% since 1992 to almost 2
million jobs at the end of 1996. As a result of the steady growth in the
Boston economy, the local unemployment rate had fallen from 7.0% in 1992 to
3.4% at December 31, 1996.
 
  In addition to its expanding economy, Massachusetts has a high and rising
standard of living. Per capita income in the Commonwealth is growing at a
faster pace than that of both the nation and the New England region as a
whole. According to the U.S. Commerce Department, per capita income in
Massachusetts grew by 6.4% to $28,021 in 1995, which was the second largest
gain in the nation for that year, and grew another 4.5% to $29,288 in 1996.
 
  The Company believes that the prospects for continued economic growth in the
region are excellent because of the diverse mix of companies in the area,
which has helped to create an economy which is both broad and deep, the local
availability of venture and growth capital, the vitality of the City of Boston
as a business, cultural and residential center, and the major improvements in
transportation infrastructure currently underway.
 
                                      56
<PAGE>
 
EAST CAMBRIDGE OFFICE SUBMARKET
 
  The Cambridge office market contains 9.8 million square feet and at
September 30, 1997 accounted for approximately 9% of Greater Boston's 103.6
million square foot office supply. According to Spaulding & Slye, the
availability rate in Cambridge as a whole fell from 12% at December 31, 1992
to 6.2% at September 30, 1997, with 813,000 square feet absorbed, while only
300,000 square feet were added to the supply. The presence of both Harvard
University and MIT attracts existing firms and is a source of new business
formation. In addition, Cambridge benefits from proximity to Logan Airport and
to Boston across the Charles River as well as from its own urban attractions.
Office development has also been aided by the availability of rapid transit
and has concentrated along areas served by the Red and Green Lines of the
Metropolitan Boston Transit Authority (the "MBTA").
 
  The East Cambridge submarket accounted for the majority of the growth in
supply that occurred in Cambridge during the 1980's and with 6.5 million
square feet, East Cambridge is now this city's largest and most active
submarket, accounting for 67% of the total office space inventory. The office
development in East Cambridge was in significant part the result of city
government initiatives that were accompanied by substantial roadway, open
space and other infrastructure improvements and expansions of supporting
retail and business services. According to Spaulding & Slye, the availability
rate in this submarket fell from 10.7% in 1992 to 3.8% at September 30, 1997
and the Direct Vacancy Rate was only 1.2% at September 30, 1997. The positive
impact of supply reductions on rent levels lagged behind absorption but is now
becoming evident; during 1992 through 1994 asking rents continued their post-
1980's decline, dipping to a low of $18.67 per square foot in 1994, before
rebounding sharply during the succeeding two years and reaching $27.59 per
square foot at September 30, 1997. The Company believes these rent levels are
still 10-15% below current replacement cost rents and will continue to
increase significantly.
 
  The Company's East Cambridge Office Properties consist of five Class A
Office Buildings with 689,203 net rentable square feet, one R&D Property with
67,362 net rentable square feet and the Company's Garage Property, which
contains 1,170 spaces.
 
  The following graph provides information regarding availability rates and
average asking rental rates per square foot at year end for each of the years
from 1992 through 1996 and at September 30, 1997 for office buildings in the
East Cambridge office submarket:
 
 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                  A
Label                             East Cambridge  
<S>          <C>                 <C> 
    1           1992                    20.54
    2           1993                    19.03
    3           1994                    18.67
    4           1995                    21.64
    5           1996                     26.7
    6           9/30/97                 27.59
    7
    8           1992                      11%
    9           1993                       9%
   10           1994                       9%
   11           1995                       6%
   12           1996                       6%
   13           9/30/97                  3.8% 

</TABLE> 
   
 
                                      57
<PAGE>
 
ROUTE 128 NORTHWEST SUBMARKET
 
  The Route 128 Northwest office submarket comprises six towns (Lexington,
Lincoln, Concord, Bedford, Burlington and Billerica) with office locations
primarily accessed by circumferential Route 128 and radial Route 2 on the
south and Route 3 on the north. Construction activity during the 1980's nearly
tripled this submarket's office supply, and its September 30, 1997 total of
7.4 million square feet of space accounted for 7% of the total Greater Boston
supply, at such date, of approximately 103.6 million square feet. Together
with the 11.5 million square feet of space in the adjacent Route
128/Massachusetts Turnpike submarket to the south it defines the preferred
core of the suburban Boston office market area.
 
  According to information from Spaulding & Slye, approximately 1.2 million
square feet of space were absorbed between 1992 and September 30, 1997, while
only 215,000 square feet were added, with a resulting dramatic decrease in the
availability rate from 23.7% to 9.8% during this period and a Direct Vacancy
Rate at September 30, 1997 of only 4.2%. Asking rents during this period
increased from $16.30 per square foot in 1992 to $22.31 per square foot at
September 30, 1997, with the greatest increase occurring in the period since
1994 when 1,077,000 square feet of space were absorbed and the asking rent
increased from $17.01 to its current level. The Company believes that vacancy
will continue to decline in the face of growing demand and limited increases
in supply with resulting further increases in market rents.
 
  The Company's Route 128 Northwest Office Properties consist of thirteen
Class A Office Buildings with 1,085,509 net rentable square feet and four R&D
Properties with 477,844 net rentable square feet.
 
  The following graph provides information regarding availability rates and
average asking rental rates per square foot at year end for each of the years
from 1992 through 1996 and at September 30, 1997 for office buildings in the
Route 128 Northwest Office Submarket:
 
 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                  A
Label                            Rt 128 NW Office
<S>          <C>                 <C> 
    1           1992                     16.3
    2           1993                    16.13
    3           1994                    17.01
    4           1995                     21.1
    5           1996                     22.5
    6           9/30/97                 22.31
    7
    8           1992                      24%
    9           1993                      18%
   10           1994                      22%
   11           1995                      13%
   12           1996                       9%
   13           9/30/97                  9.8% 

</TABLE> 
 
 
RECENTLY COMPLETED DEVELOPMENT PROPERTY IN THE ROUTE 128 NORTHWEST SUBMARKET
 
  201 Spring Street. 201 Spring Street is a 102,000 net rentable square foot,
Class A Office Building located in Lexington, Massachusetts, in the Route 128
Northwest submarket of Greater Boston. This building is adjacent to the
Company's existing Class A Office Building at 191 Spring Street. 201 Spring
Street was delivered November 1, 1997. The building is currently 100% leased
to MediaOne, formerly Continental Cablevision, Inc. MediaOne has notified the
Company that it intends to relocate its headquarters to another state and
sublease this building.
 
GREATER WASHINGTON, D.C. MARKET
 
  Greater Washington, D.C., which includes the District of Columbia and the
adjacent areas of Northern Virginia and suburban Maryland, is the fifth
largest metropolitan area in the country and the heart of the nation's federal
government and policy-making activities. The region's workforce is one of the
most highly educated of metropolitan areas nationwide and has the highest
participation of women in the labor force and the highest concentration of
scientists and engineers, with the second largest concentration of high
technology firms. Business service industries, including technology-intensive
knowledge-based industries such as information management and data
communications, have been the economy's engines of growth in the 1990's,
expanding by 26.5% from 1992 to 1996. In 1996 the area had a median household
income of $48,100, the highest in the country.
 
                                      58
<PAGE>
 
  Employment increases in Greater Washington, D.C. associated with growth in
the private economy, particularly the service sector which as a whole grew 15%
in the five years ended December 31, 1996, have more than offset the job
reductions resulting from the substantial downsizing of the government sector
during this period, and non-government employment now accounts for
approximately three-quarters of the area's total employment. Unemployment in
Greater Washington, D.C. fell from 5.4% in 1992 to 3.4% in 1996, well below
the national 1996 rate of 5.4%. The Company believes that these trends and
resulting increasing demand for office space will continue in light of the
composition of the region's economy and anticipated population and employment
growth. The Washington, D.C. metropolitan area population is expected to
increase by 552,000 between 1996 and 2001, with growth in total employment of
approximately 175,000 and growth in office-based employment of approximately
88,500.
 
  The growth in business demand for office space over the last five years,
combined with relatively limited increases in supply, is directly reflected in
vacancy reductions and strengthening rents. According to Spaulding & Slye,
total office space supply in the Greater Washington, D.C. area was 247.4
million square feet at September 30, 1997 compared to 239.6 million square
feet in 1992, an increase of 2.7 million square feet (an annual increase of
approximately 6% per year), while during the same period the market absorbed
approximately 18.5 million square feet, resulting in a decrease in the vacancy
rate from 14.4% in 1992 to 8.9% at September 30, 1997. The absorption was
particularly strong in 1995 and 1996, with approximately 9.2 million square
feet of absorption and an increase in average asking rent from $20.85 per
square foot to $22.76 per square foot. The Company believes that for the
foreseeable future space absorption will continue to substantially outstrip
growth in supply and that further reductions in vacancy rates will be
accompanied by proportionally greater increases in rent levels.
 
SOUTHWEST WASHINGTON, D.C. SUBMARKET
 
  The 9.0 million square feet of Class A office space in the Southwest
Washington, D.C. submarket accounted for approximately 10% of the total Class
A office supply in Washington, D.C. at September 30, 1997. This submarket has
been one of the strongest submarkets in Greater Washington, D.C. over the past
five years.
 
  According to Spaulding & Slye, the availability rate in this submarket
averaged 5.6% between 1992 and 1995 and had fallen to a low of 4.5% in 1995
before it increased to 9.5% at September 30, 1997 (Blue Cross-Blue Shield put
its owner-occupied 526,000 square foot building on the market in 1996). In
comparison, the availability rate in the Washington, D.C. market as a whole
averaged 10.3% between 1992 and 1995 and was 10.0% at September 30, 1997. The
asking rental rate in the Southwest Washington, D.C. submarket increased from
$28.86 per square foot in 1992 to $29.91 per square foot at September 30,
1997. The Company believes the relative strength of the Southwest Washington,
D.C. submarket reflects the accessibility to major government offices and the
comparatively limited supply of private office space as a proportion of total
office space (including government-owned buildings) in this submarket.
 
  The Company's Southwest Washington, D.C. Office Properties consist of four
Class A Office Buildings with 1,560,941 net rentable square feet.
 
  The following graph provides information regarding availability rates and
average asking rental rates per square foot at year end for each of the years
from 1992 through 1996 and at September 30, 1997 for office buildings in the
Southwest Washington, D.C. office submarket. Average asking rental rates
declined during the period from 1993 to September 30, 1997 and Availability
Rates varied during this period.
 
 
 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                  A
Label                             Wash DC
<S>          <C>                 <C> 
    1           1992               28.86
    2           1993               36.84
    3           1994               34.61
    4           1995               32.81
    5           1996                  31
    6          9/30/97             29.91
    7
    8           1992                4.7%
    9           1993                6.5%
   10           1994                6.5%
   11           1995                4.5%
   12           1996                9.0%
   13          9/30/97              9.5% 

</TABLE> 

                                      59
<PAGE>
 
DOWNTOWN BALTIMORE, MARYLAND SUBMARKET
 
  The metropolitan Baltimore, Maryland office market comprises approximately
36.4 million square feet, ranking it as the 21st largest office market in the
nation, comparable in size to San Diego and Cleveland. The Company's 100 East
Pratt Street Property is located in the downtown submarket of metropolitan
Baltimore. With 13.7 million square feet of office space, the downtown
Baltimore submarket accounted for approximately 37.5% of the metropolitan
Baltimore office market at June 30, 1997. The top tier of Class A Office
Buildings ("Tier A1") in downtown Baltimore consists of ten buildings,
including the Company's 100 East Pratt Street Property. The Tier A1 buildings
total approximately 3.6 million square feet and at June 30, 1997 had a
combined vacancy rate of 8.6%.
 
  The following graph provides information regarding availability rates and
average asking rental rates per square foot at year end for each of the years
from 1992 through 1996 and at September 30, 1997 for Class A office buildings
in the downtown Baltimore submarket. 100 East Pratt Street competes with the
nine other Tier A1 buildings in this submarket, which the Company believes
generally achieve higher rents and occupancy rates than Class A buildings in
this submarket in general.

 
                            [GRAPH APPEARS HERE]

<TABLE>
<CAPTION>  
 
               Label                  A
Label                             Baltimore
<S>          <C>                 <C> 
    1           1992                19
    2           1993                19 
    3           1994              19.5
    4           1995              21.5
    5           1996              22.5
    6         9/30/97             24.5
    7
    8           1992                22%
    9           1993                17%
   10           1994                17%
   11           1995                17%
   12           1996                14%
   13         9/30/97             13.1% 

</TABLE> 
 
 
RECENT ACQUISITION IN BALTIMORE, MARYLAND SUBMARKET
 
  100 East Pratt Street. 100 East Pratt Street is a 633,482 net rentable
square foot Class A Office Building. The property was acquired by the Company
in October 1997. 100 East Pratt Street is located along the prestigious "Pratt
Street Corridor" overlooking Baltimore's Inner Harbor. The office tower was
designed by Skidmore, Owings and Merrill and has won numerous architectural
awards. The building has a full complement of amenities including a 940 space
parking garage, health club and a conference center occupying an entire floor
for the exclusive use of tenants.
 
DOWNTOWN RICHMOND, VIRGINIA SUBMARKET
 
  The Riverfront Plaza Property is located in the downtown submarket of
Richmond, Virginia. Located along the James River, the downtown submarket is
generally bounded by Interstate 64 to the north, the James River to the south,
U.S. Route 301 to the west and Interstate 95 to the east. The downtown
submarket is located approximately ten minutes' travel from Richmond
International Airport, and the region's affluent communities are easily
accessible in the suburbs to the north, east and west.
 
                                      60
<PAGE>
 
  The downtown Richmond Class A office market consists of nine buildings with
3.0 million square feet of office space. During the period from 1992 through
September 30, 1997, the availability rate for Class A office space decreased
from 19.8% to 5.0% and the average asking rent decreased from $22.23 per
square foot to $20.84 per square foot.
 
  The following graph provides information regarding availability rates and
average asking rental rates per square foot at year end for each of the years
from 1992 through 1996 and at September 30, 1997 for Class A office buildings
in the downtown Richmond submarket:

 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                A
Label                       Downtown Richmond
<S>          <C>                 <C> 
    1           1992              22.23
    2           1993              21.84
    3           1994              20.86
    4           1995               20.4
    5           1996               20.4
    6         9/30/97             20.84
    7
    8           1992              19.8%
    9           1993              17.0%
   10           1994              13.2%
   11           1995               9.5%
   12           1996               8.6%
   13         9/30/97              5.0% 

</TABLE> 
 
PENDING ACQUISITION IN RICHMOND, VIRGINIA SUBMARKET
 
  Riverfront Plaza. Riverfront Plaza is an approximately 900,000 (excluding
storage space) net rentable square foot Class A office, retail and parking
complex consisting of twin 20-story towers. The Company entered into an
agreement to purchase the Property on November 11, 1997 and expects to close
the acquisition in January, 1998. Although the Company has substantially
completed its due diligence review of Riverfront Plaza, there can be no
assurance that the acquisition will be consummated in January 1998, or at all.
Riverfront Plaza is located on the James River in Richmond, Virginia and is
immediately adjacent to the "Canal Walk" redevelopment area. This project, led
by the City of Richmond, calls for the renovation of the canal area into a
mixed use "24-hour" activity center. The building's 2,178 space garage
provides the highest ratio of parking of any building in Richmond.
 
MONTGOMERY COUNTY, MARYLAND SUBMARKETS
 
  Montgomery County had a total of approximately 34.9 million square feet of
office space at September 30, 1997, accounting for 68% of the total suburban
Maryland office stock of approximately 51.3 million square feet. According to
Spaulding & Slye, there has been significant improvement in the suburban
Maryland market in the past two years, with virtually no increase in supply,
the absorption of 2.4 million square feet and a decline in availability from
19.4% to 14.7% as of September 30, 1997. The Company's Properties in this area
are located within two submarkets in Montgomery County, the Bethesda-Rock
Spring submarket and the Gaithersburg I-270 submarket.
 
                                      61
<PAGE>
 
 BETHESDA-ROCK SPRING OFFICE SUBMARKET
 
  The Bethesda-Rock Spring office submarket is the fourth largest in
Montgomery County and suburban Maryland, with a total of 4.7 million square
feet of office space at September 30, 1997. According to Spaulding & Slye,
supply has remained flat since the addition of 777,000 square feet during
1993. This supply addition, combined with cutbacks in defense spending that
led defense contractors to place substantial amounts of sublease space on the
market in 1994, resulted in negative absorption in 1994 and caused
availability to spike briefly to 25.6% at the end of that year. Since then the
market has strengthened considerably, absorbing 1,025,000 square feet. With no
new supply of office space during this period, the availability rate at
September 30, 1997 fell to 3.7% and the average asking rent rose to $23.09 per
square foot.
 
  The following graph provides information regarding availability rates and
average asking rental rates at year end for each of the years from 1992
through 1996 and at September 30, 1997 for office buildings in the Bethesda-
Rock Spring office submarket:
 
 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                   A
Label                          Bethesda-Rock Spring
<S>          <C>                 <C> 
    1           1992                       23
    2           1993                       23 
    3           1994                       22
    4           1995                    22.75
    5           1996                       23
    6         9/30/97                   23.09
    7
    8           1992                     8.7%
    9           1993                    18.8%
   10           1994                    25.6%
   11           1995                    17.1%
   12           1996                     4.6%
   13         9/30/97                    3.7% 

</TABLE> 

 
  The Company has three Class A Office Properties in this submarket with
680,000 net rentable square feet.
 
 GAITHERSBURG I-270 OFFICE SUBMARKET
 
  The Gaithersburg I-270 office submarket consists of 2.9 million square feet
with inventory remaining steady since a 76,000 square foot building was
completed in 1992. In 1994, this submarket was impacted by the departure of
IBM, which had maintained a substantial presence in the area, causing
absorption to slump that year to negative 288,000 square feet and availability
to spike to 31.1%. The following year, transactions by government contractors
led to a sharp turnaround, with record-high absorption of 415,000 square feet
in 1995 and further positive absorption since then, reducing the availability
rate to 13.7% by September 30, 1997 and sparking an increase in average asking
rents from $17.12 per square foot in 1994 to $19.50 per square foot at
September 30, 1997.
 
                                      62
<PAGE>
 
  The following graph provides information regarding availability rates and
average asking rental rates per square foot at year end for each of the years
from 1992 through 1996 and at September 30, 1997 for office properties in the
Gaithersburg I-270 office submarket:
 
 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                  A
Label                             Gaithersburg
<S>          <C>                  <C> 
    1           1992                  19.34
    2           1993                  19.36
    3           1994                  17.12
    4           1995                  17.88
    5           1996                   19.4
    6          9/30/97                 19.5
    7
    8           1992                  18.4%
    9           1993                  21.1%
   10           1994                  31.1%
   11           1995                  16.6%
   12           1996                  13.8%
   13          9/30/97                13.7% 

</TABLE> 
 
  The Company has one Class A Office Building in this submarket with 122,157
net rentable square feet.
 
RECENTLY COMPLETED DEVELOPMENTS IN THE SPRINGFIELD, VIRGINIA FLEX/OFFICE
SUBMARKET
 
  7700 Boston Boulevard, Building Twelve and 7501 Boston Boulevard, Building
Seven. On land owned by the Company in the Virginia-95 Office Park developed
by the Company, the Company completed and delivered two build-to-suit projects
in October and November, 1997. These two R&D Properties contain approximately
82,229 and 75,756 rentable square feet, respectively. 7501 Boston Boulevard,
Building Seven was developed by the Company for the General Services
Administration (specifically for use by the United States Customs Service).
7700 Boston Boulevard Building Twelve is the headquarters of Autometric, Inc.
and has expansion potential for another 40,000 square feet of space. 7501
Boston Boulevard, Building Seven and 7700 Boston Boulevard, Building Twelve
are leased in their entirety to the GSA and Autometric, Inc. for terms of 10
and 15 years, respectively.
 
  Sugarland Buildings One and Two. These single story office/flex buildings on
extensively landscaped sites are located in the Sugarland Office Complex in
Herndon, Virginia, within one mile of Reston Town Center and in the midst of
the Reston-Herndon-Dulles high-technology area. Building One, constructed in
1985, contains approximately 52,797 net rentable square feet and is on a 4.67
acre parcel with 297 parking spaces. Building Two, also constructed in 1985,
contains approximately 59,423 net rentable square feet and is on a 4.93 acre
parcel with 234 parking spaces. The Company purchased the buildings vacant in
1996, completed improvements to them in June 1997 and as of December 1, 1997
had approximately 70% of the total of 112,220 net rentable square feet
committed under signed leases or letters of intent with leases in negotiation.
 
FAIRFAX COUNTY, VIRGINIA MARKET
 
  The Fairfax County, Virginia office market had a total of approximately 62.4
million square feet of space at September 30, 1997, up only 2% over 1992. The
Company's completed Properties in Fairfax County are office/flex buildings in
the Springfield, Virginia submarket which had a total of approximately 5.4
million square feet at September 30, 1997. Continued positive absorption
during this period reduced the availability rate from 17.9% in 1992 to 6.1% at
September 30, 1997, and asking rental rates, after falling to $7.65 per square
foot in 1994, have increased substantially to $10.04 per square foot at
September 30, 1997.
 
 
                                      63
<PAGE>
 
  The following graph provides information regarding availability rates and
average rental rates per square foot at year end for each of the years from
1992 through 1996 and at September 30, 1997 for office buildings in the
Springfield, Virginia flex/office submarket:

                             [GRAPH APPEARS HERE]

<TABLE> 
<CAPTION> 

               Label                   A
Label                              Springfield
<S>          <C>                  <C> 
    1           1992                     8.65
    2           1993                     8.14
    3           1994                     7.65
    4           1995                     9.04
    5           1996                     9.96
    6          9/30/97                  10.04
    7
    8           1992                    17.9%
    9           1993                    16.7%
   10           1994                    16.7%
   11           1995                    11.2%
   12           1996                     7.6%
   13          9/30/97                   6.1% 

</TABLE> 
  
  In this submarket, the Company has eleven R&D Properties aggregating 791,138
net rentable square feet.
 
MIDTOWN MANHATTAN OFFICE MARKET
 
  New York City is a world renowned business capital and cultural center, with
service and retail industries driving its economy. New York remains the
nation's leader in financial services and attracts international transactions
and global businesses. A major gateway to the United States, its extensive
transportation infrastructure includes three airports, premier port and rail
services and the nation's largest mass transit system.
 
  Despite increasing costs, New York City's economy has remained competitive
in the areas of retail/wholesale trade and business services, which combine
for over one-half of the City's employment base. The services sector,
particularly financial, legal, public relations and other business service
industries, continue to be an area of growth. This sector also provides high
wage jobs which have contributed to the high level of consumption-based
activity in the City's economy over the past several years.
 
  Largely a result of growing opportunities in the services and
retail/wholesale trade sectors, the unemployment rate in New York City has
recovered steadily during the past five years. This overall increase in
employment has combined with a trend to locational preference for midtown
Manhattan as compared to the Downtown/Wall Street area for office-based
employers, leading to falling vacancy rates and increasing rent levels in this
market area.
 
  According to information provided by Insignia/ESG, the midtown Manhattan
market at September 30, 1997 consisted of 194.7 million square feet of space,
with supply up 3.2 million square feet (1.7%) over 1992 and absorption of 8.6
million square feet in the same period. The resulting net reduction in supply
correlates with a decline in the availability rate (space currently vacant
becoming available within 12 months directly or on sublease and additions to
supply) from 1992 to September 30, 1997 from 16.5% to 10.7% in midtown and an
increase in asking rent from $32.19 per square foot to $34.31 per square foot
over the same period.
 
                                      64
<PAGE>
 
PARK AVENUE SUBMARKET
 
  Two of the Company's three midtown Manhattan Office Properties are located
within the Park Avenue submarket of the midtown Manhattan market area. The
Park Avenue submarket, with 25.7 million square feet of office space as of
September 30, 1997 (an increase of only 300,000 square feet over 1992), is
characterized by higher rent levels and lower availability rates than midtown
Manhattan generally and has also seen greater improvement during the past five
years. During the period 1992 through September 30, 1997, the availability
rate in this submarket declined from 15.1% to 7.6% and the average asking rent
increased from $40.36 per square foot to $46.31 per square foot.
 
  The following graph provides information regarding availability rates and
average asking rental rates per square foot at year end for each of the years
from 1992 through 1996 and at September 30, 1997 for office buildings in the
Park Avenue office submarket:
 
 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                  A
Label                             Park Avenue
<S>          <C>                 <C> 
    1           1992                    40.36
    2           1993                    41.09
    3           1994                    42.98
    4           1995                    44.13
    5           1996                     44.4
    6         9/30/97                   46.31
    7
    8           1992                    15.1%
    9           1993                    13.1%
   10           1994                     8.2%
   11           1995                    12.5%
   12           1996                    11.4%
   13         9/30/97                    7.6% 

</TABLE> 

 Description of Park Avenue Submarket Properties
 
  280 Park Avenue. The Company acquired this Property on September 11, 1997.
280 Park Avenue is a modern Class A Office Building containing approximately
1.2 million net rentable square feet. The Property is located on the full
westerly blockfront of Park Avenue between East 48th Street and East 49th
Street and occupies two-thirds of the block running from Park Avenue toward
Madison Avenue. 280 Park Avenue was designed by Emery Roth & Sons and was
built in two phases. The 30 story East Tower was built in 1961 and the 42
story West Tower was constructed in 1968. The Property recently underwent a
significant modernization program including upgrades to the HVAC and life
safety systems, exterior plazas, lobby areas, the Park Avenue and mid-block
entrances. Across Park Avenue from the Property to the north are the Waldorf-
Astoria Hotel and the landmark St. Bartholomew's Church. The Property is only
four blocks from Grand Central Terminal and its commuter rail lines and subway
connections, and is one block from a new direct entrance to Grand Central
Terminal that is currently under construction. As of September 30, 1997,
Bankers Trust Company leased 208,276 net rentable square feet (approximately
18% of the net rentable square feet) pursuant to a lease which expires
February 28, 2011. Bankers Trust Company has two five-year extension options
following the initial lease expiration at a base rent equal to 85% of the fair
rental value of the property on the commencement date of such extension.
Pursuant to such lease, Bankers Trust Company is expected to pay base rent per
leased square foot of $35.00 during the years 1997 through 2001, $36.01 in
2002, $39.00 during the years 2003 through 2006, $40.01 in 2007, and $43.00
during the years 2008 through 2011. As of September 30, 1997, the National
Football League leased 201,658 net rentable square feet (approximately 17% of
the net rentable square feet) pursuant to a lease which expires February 28,
2012. Pursuant to such lease, the National Football League is expected to pay
 
                                      65
<PAGE>
 
base rent per leased square foot of $39.33 during the years 1997 through 2001,
$41.02 in 2002, $41.35 during the years 2003 through 2006, $43.04 in 2007, and
$43.37 during the years 2008 through 2012. As of September 30, 1997, Furman
Selz LLC leased 159,288 net rentable square feet (approximately 14% of the net
rentable square feet) pursuant to a lease which expires January 31, 2014. The
Company has committed to lease an additional 46,078 square feet to Furman Selz
LLC effective November 1, 1997. This additional space will bring the total net
rentable square feet to 205,366 (approximately 18% of the net rentable square
feet). Pursuant to such lease, Furman Selz LLC will receive free rent during
the period from July 1, 1997 through February 1, 1999 on 159,288 square feet
and from November 1, 1997 through February 1, 1999 on 46,078 square feet.
Furman Selz LLC is expected to pay base rent per leased square foot of $37.29
in 1999, $40.75 during the years 2000 through 2003, $44.18 in 2004, $44.50
during the years 2005 through 2008, $47.97 in 2009, and $48.29 during the years
2010 through 2014. In connection with this lease, the Company is required to
pay $9.2 million towards tenant improvements and $3.4 million of leasing
commissions.
 
  Based on information provided by the previous owner of this Property, the
occupancy rate for this Property at January 5, 1994, 1995, 1996 and 1997 and at
September 30, 1997 was 88.2%, 77.1%, 70.0%, 83.7% and 81.9%, respectively. The
Average Effective Annual Rent per leased square foot of 280 Park Avenue for the
nine months ended September 30, 1997 was $42.71. Based on the information
provided to the Company by the previous owner of this Property, the Company is
unable to provide occupancy rates for 1992 and 1993 and Average Effective
Annual Rent information for the years 1992 through 1996.
 
  The aggregate tax basis of depreciable real property at 280 Park Avenue for
federal income tax purposes was $197.3 million as of September 30, 1997.
Depreciation is computed on the straight-line method over the estimated life of
the real property which is 39 years. For the tax year ending June 30, 1998, 280
Park Avenue will be taxed by the Borough of Manhattan at a rate equal to
$10.164 per $100 of assessed value, resulting in a total tax for such period
equal to $9,575,493.
 
  In the Company's opinion, 280 Park Avenue is adequately covered by insurance.
 
  In addition to normally recurring capital expenditures, the Company has
committed or budgeted to invest $29.0 million in tenant improvements, leasing
commissions and building system improvements.
 
  The following schedule of lease expirations for this Property sets forth: (i)
the number of leases expiring; (ii) the total area in square feet covered by
such leases; (iii) the Annualized Rent represented by such leases; and (iv) the
percentage of Annualized Rent represented by such leases, for the three months
ending December 31, 1997, each of the years 1998 through 2006, and the year
2007 and beyond:
 
<TABLE>
<CAPTION>
                    THREE
                    MONTHS
                    ENDING                                                                                          2007 AND
                   12/31/97    1998    1999     2000        2001       2002      2003    2004    2005      2006      BEYOND
                   --------  --------  ----  ----------  ----------  --------  --------  ----  --------  --------  -----------
<S>                <C>       <C>       <C>   <C>         <C>         <C>       <C>       <C>   <C>       <C>       <C>
Number of Leases
 Expiring........         1         3     0           9           6         1         3     0         1         1           15
Square Footage of
 Expiring
 Leases..........     6,720     9,753     0      53,674      78,421     3,254    25,696     0    16,500     5,594      759,789
Annualized Rent..  $422,697  $392,546  $  0  $2,765,709  $3,855,416  $134,024  $927,202  $  0  $769,050  $194,392  $30,787,965
Percentage of
 Annualized Rent
 Expiring........      1.05%     0.98% 0.00%       6.87%       9.58%     0.33%     2.30% 0.00%     1.91%     0.48%       76.49%
</TABLE>
 
 
  The Property is subject to a mortgage as set forth under "Management's
Discussion and Analysis of Financial Condition and Results of Operations--
Liquidity and Capital Resources--Mortgage Indebtedness."
 
  599 Lexington Avenue. The revenue from this Property amounted to more than
10% of the Company's revenue for the pro forma twelve months ended September
30, 1997. 599 Lexington Avenue is a 50-story, 1 million square foot Class A
Office Building that occupies the entire blockfront on the east side of
Lexington Avenue between 52nd and 53rd Streets, directly across 53rd Street
from Citicorp Center. The building was completed by the Company in 1984.
Designed by architect Edward Larrabee Barnes, 599 Lexington Avenue has a finely
detailed aluminum and glass curtain wall exterior and rises to its 653 foot
height through a series of distinctive geometric setbacks. The building sits on
a 45,000 square foot site including a triangular plaza in front of its main
entrance facing the corner of 53rd Street and Lexington Avenue that includes an
entrance to the city subway system providing direct access to two separate
subway lines. The 50-foot tall glass-fronted marble lobby showcases a major
three dimensional work by American artist Frank Stella. The ground floor of the
building has approximately 24,500 square feet of retail space fronting on
Lexington Avenue and 52nd and 53rd Streets.
 
                                       66
<PAGE>
 
Approximately 80% of the 985,500 rentable square feet of office space is on
virtually column-free floors of 21,000 square feet or more, which the Company
believes enables tenants to house their operations with an unusually high
level of efficiency. The building's setbacks at its upper levels provide a
series of floors of 15,750 and then 7,600 square feet that can offer high
visibility for small and medium-size tenancies on a multi-tenant or full floor
occupancy basis.
 
  As of September 30, 1997, Shearman & Sterling, a national law firm, leased
424,649 net rentable square feet (approximately 42% of the net rentable square
feet) pursuant to a lease which expires August 31, 2007. Pursuant to such
lease, Shearman & Sterling is expected to pay base rent per leased square foot
of $30.02 in 1997, $34.51 during the years 1998 through 2001, $35.84 in 2002,
and $38.23 during the years 2003 through 2007. In addition, under such lease
the tenant has four five-year extension options following the expiration of
the lease on August 31, 2007. As of December 31, 1996, Jones, Day, Reavis &
Pogue ("Jones, Day"), a national law firm, leased 144,289 net rentable square
feet (approximately 14% of the net rentable square feet) pursuant to a lease
which expires February 28, 2002 with respect to 128,539 net rentable square
feet and on May 31, 2006 with respect to the remaining 15,750 net rentable
square feet. Jones, Day has a five-year renewal option with respect to the
128,539 net rentable square feet expiring February 28, 2002. Pursuant to its
lease, Jones, Day is expected to pay base rent per leased square foot of
$50.65 in 1997, $51.21 in 1998, $51.43 in 1999, $51.65 in 2000, $52.18 in
2001, and $52.41 in 2002, and, with respect to the 15,750 net rentable square
feet expiring May 31, $48.00 during the years 2003 through 2006. As of
December 31, 1996, Citibank, N.A., a national bank, leased 114,350 square feet
(approximately 11% of the net rentable square feet) pursuant to a lease which
expires on December 31, 2002. Pursuant to this lease, Citibank is expected to
pay base rent per leased square foot of $39.50 in 1997, $42.79 in 1998, and
$45.50 during the years 1999 through 2002.
 
  The Average Effective Annual Rent per leased square foot of 599 Lexington
Avenue for the years ended December 31, 1992, 1993, 1994, 1995, 1996, and
September 30, 1997 was $41.08, $41.08, $40.75, $40.65, $39.94 and $40.06,
respectively. The occupancy rate of the Property for each of such years was
99.2%, 100.0%, 97.2%, 99.7%, 99.5% and 99.7%, respectively.
 
  The aggregate tax basis of depreciable real property at 599 Lexington Avenue
for federal income tax purposes was $144.8 million as of September 30, 1997.
Depreciation is computed on the straight-line method over the estimated life
of the real property which range from 18 to 39 years. The aggregate tax basis
of depreciable personal property associated with 599 Lexington Avenue for
federal income tax purposes was $6.0 million as of September 30, 1997.
Depreciation is computed on the straight-line and double declining balance
methods over the estimated useful life of the personal property of five or
seven years. For the tax year ending June 30, 1998, 599 Lexington Avenue will
be taxed by the Borough of Manhattan at a rate equal to $10.164 per $100 of
assessed value, resulting in a total tax for such period equal to $10,766,725.
 
  The Property is subject to a mortgage as set forth under "Management's
Discussion and Analysis of Financial Condition and Results of Operations--
Liquidity and Capital Resources--Mortgage Indebtedness." Such mortgage is not
prepayable. The mortgage lender has an option to purchase, at the maturity of
the mortgage, a 33.33% interest in the Property in exchange for cancellation
of the outstanding balance of the mortgage (which option, if exercised, would
ascribe an implied value of approximately $675.0 million to the Property as a
whole). The mortgage requires that the Property be managed by a limited
liability company (the "599 Manager") which is at all times controlled by Mr.
Zuckerman or Mr. Linde. The economic interests in the 599 Manager are 99.9%
owned by the Company, and Messrs. Zuckerman and Linde are the sole managing-
members, and hold the remaining 0.1% interest. In the event the 599 Manager is
no longer controlled by Mr. Zuckerman and Mr. Linde, other than as a result of
their respective deaths or incapacity, the mortgage lender could require the
mortgage loan to be repaid in its entirety prior to maturity. Each of Messrs.
Zuckerman and Linde have agreed to notify the Company at least six months
prior to resigning as a managing member of the 599 Manager.
 
 
                                      67
<PAGE>
 
  The following schedule of lease expirations for this Property sets forth:
(i) the number of leases expiring; (ii) the total area in square feet covered
by such leases; (iii) the Annualized Rent represented by such leases; and (iv)
the percentage of Annualized Rent represented by such leases, for the three
months ending December 31, 1997, each of the years 1998 through 2006, and the
year 2007 and beyond:
 
<TABLE>
<CAPTION>
                  THREE MONTHS
                     ENDING
                    12/31/97      1998      1999       2000     2001     2002         2003       2004      2005      2006
                  ------------ ----------  -------  ----------  ----  -----------  ----------  --------  --------  --------
<S>               <C>          <C>         <C>      <C>         <C>   <C>          <C>         <C>       <C>       <C>
Number of Leases
 Expiring.......            3           6        1           3     0           11           5         2         4         1
Square Footage
 of Expiring
 Leases.........       41,647      27,360      350      19,118     0      400,266      21,365     6,145    17,043    15,750
Annualized
 Rent...........   $2,362,004  $1,166,934  $35,494  $1,003,435     0  $21,825,951  $1,642,029  $462,266  $898,022  $693,789
Percentage of
 Annualized Rent
 Expiring.......         4.45%       2.20%    0.07%       1.89% 0.00%       41.14%       3.09%     0.87%     1.69%     1.31%
<CAPTION>
                   2007 AND
                    BEYOND
                  ------------
<S>               <C>
Number of Leases
 Expiring.......            3
Square Footage
 of Expiring
 Leases.........      447,999
Annualized
 Rent...........  $22,964,952
Percentage of
 Annualized Rent
 Expiring.......        43.29%
</TABLE>
 
  In the Company's opinion, 599 Lexington Avenue is adequately covered by
insurance.
 
  Other than normally recurring capital expenditures, the Company has no plans
with respect to material renovation, improvement or redevelopment of 599
Lexington Avenue.
 
  See "Operating Partnership Agreement--Tax Protection Provisions."
 
EAST SIDE SUBMARKET
 
  The East Side Submarket consists of 15.8 million square feet in 33 buildings
generally located east of Park Avenue and north of 46th Street. During the
period from 1992 through September 30, 1997, the availability rate in this
submarket declined from 17.2% to 12.6% and the average asking rent increased
from $31.42 per square foot to $36.95 per square foot.
 
 
                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

               Label                    A
Label                             Eastside Office  
<S>          <C>                 <C> 
    1           1992                    31.42
    2           1993                     30.2
    3           1994                    32.21
    4           1995                     35.3
    5           1996                    34.77
    6         9/30/97                   36.95
    7
    8           1992                    17.2%
    9           1993                    14.8%
   10           1994                     8.8%
   11           1995                     9.8%
   12           1996                    11.8%
   13         9/30/97                   12.6% 

</TABLE> 
   
RECENT ACQUISITION IN EAST SIDE SUBMARKET
 
  875 Third Avenue. 875 Third Avenue was acquired by the Company on November
21, 1997. This approximately 682,000 net rentable square foot Class A Office
Building is located in midtown Manhattan on Third Avenue between 53rd and 52nd
Streets. The Property is located in the Eastside submarket of midtown
Manhattan, one block from the Park Avenue submarket. As of September 30, 1997,
Debevoise & Plimpton leased 279,375 net rentable square feet (approximately
40% of the net rentable square feet) pursuant to a lease which expires October
31, 2002. Pursuant to such lease, Debevoise & Plimpton is expected to pay Base
Rent per leased square foot of $42.64 in 1997 and $44.12 during the years 1998
through 2002. As of September 30, 1997, Instinet Corporation leased 148,000
net rentable square feet (approximately 21% of the net rentable square feet)
pursuant to a lease which expires July 31, 2003. Pursuant to such lease,
Instinet Corporation is expected to pay base rent per leased square foot of
$27.98 in 1997, $29.58 in 1998, $31.44 in 1999, and $31.85 during the years
 
                                      68
<PAGE>
 
2000 through 2003. As of September 30, 1997, Sidley & Austin leased 131,250
net rentable square feet (approximately 19% of the net rentable square feet)
pursuant to a lease which expires June 30, 2002. Pursuant to such lease,
Sidley & Austin is expected to pay base rate per leased square foot of $43.27
during the years 1997 through 2002. As of September 30, 1997, Grey
Advertising, Inc. leased 90,250 net rentable square feet (approximately 13% of
the net rentable square feet) of which 64,000 square feet expires December 31,
1999 and 26,250 square feet expires June 30, 2002. Pursuant to its leases,
Grey Advertising, Inc. is expected to pay base rent per leased square foot of
$30.11 in 1997, $31.53 during the years 1998 through 1999 and $38.50 during
the years 2000 through 2002.
 
  The Average Effective Annual Rent per leased square foot of 875 Third Avenue
for the nine months ended September 30, 1997 was $39.41. According to
information provided by the seller of this property, the occupancy rate for
this Property for the years ended December 31, 1992, 1993, 1994, 1995 and 1996
was 98.3%, 96.5%, 100.0%, 100.0% and 100.0%, respectively. The occupancy rate
of the Property for the nine months ended September 30, 1997 was 100%. Based
on the information provided to the Company by the previous owner of this
Property, the Company is unable to provide Average Effective Annual Rent
information for the years 1992 through 1996.
 
  The aggregate tax basis of depreciable real property at 875 Third Avenue for
federal income tax purposes was $148.6 million as of September 30, 1997.
Depreciation is computed on the straight-line method over the estimated life
of the real property which is 39 years. For the tax year ending June 30, 1998,
875 Third Avenue will be taxed by the Borough of Manhattan at a rate equal to
$10.164 per $100 of assessed value, resulting in a total tax for such period
equal to $6,266,106.
 
  For information concerning the expiration of leases with respect to 875
Third Avenue, see "Business and Properties--Tenants--Lease Expirations of
Office and Industrial Properties--Eastside."
 
  In the Company's opinion, 875 Third Avenue is adequately covered by
insurance.
 
  Other than normally recurring capital expenditures, the Company has no plans
with respect to material renovation, improvement or redevelopment of 875 Third
Avenue.
 
  The Property is subject to a mortgage as set forth under "Management's
Discussion and Analysis of Financial Condition and Results of Operations--
Liquidity and Capital Resources--Mortgage Indebtedness."
 
  See "Operating Partnership Agreement--Tax Protection Provisions."
 
                             THE HOTEL PROPERTIES
 
  The Company owns two Hotel Properties in the Greater Boston area, one in
downtown Boston on the Boston Harbor waterfront and one in East Cambridge that
is part of the Cambridge Center development. Both hotels are operated by
Marriott International, Inc. under the Marriott(R) name. In order to assist
the Company in maintaining its qualifications as a REIT under federal tax law,
the Company leases the Hotel Properties, pursuant to separate leases with a
participation in the gross receipts of the Hotel Properties, to a lessee (ZL
Hotel LLC) in which Messrs. Zuckerman and Linde are the sole member-managers.
Messrs. Zuckerman Linde have a 9.8% economic interest in such lessee and two
unaffiliated public charities have a 90.2% economic interest. Marriott
International, Inc. operates the Hotel Properties under the Marriott(R) name
pursuant to management agreements with ZL Hotel LLC.
 
THE HOTEL DEVELOPMENT PROPERTY
 
  Residence Inn by Marriott(R). The Company is developing a 221 room limited-
service Residence Inn by Marriott(R) on a site in the Company's Cambridge
Center development. Residence Inn by Marriott(R) is an extended-stay hotel.
 
GREATER BOSTON HOTEL MARKET
 
  Over the past five years the Greater Boston hotel market has consistently
ranked as one of the strongest lodging markets in the country, with high
occupancy and average room rates resulting in revenues per available room
("REVPAR," the hotel industry standard of comparison) significantly higher
than average. In 1996, according to Horwath Landauer/Smith Travel Research,
the Greater Boston hotel market supply of approximately
 
                                      69
<PAGE>
 
34,500 rooms had an overall occupancy rate of 73.5% and an average room rate
of $105.51, ranking fourth in both of these categories out of the top 25
markets nationwide.
 
  The strength of this market reflects the broad base of room demand in Boston
as a national and international business, tourist and meeting destination.
Business growth in Boston from 1992 through 1996 has been strong as reflected
in falling office vacancy rates and unemployment rates (see "--The Office
Properties--Greater Boston Office Market"). Boston has grown steadily as a
national and international tourist destination, with total visitors to Boston
reaching a record 10.6 million in 1996 according to the Boston Convention and
Tourist Bureau, up 21% over 1992. Boston is also an important meeting and
convention site, ranked as a "first-tier" convention city even though as a
result of the limited size of exhibition space available in its Hynes
Convention Center it does not rank in the top 30 in the amount of prime
exhibit space in its principal convention facility. In November 1997, the
state enacted legislation providing for the development of a new convention
center with an estimated cost of approximately $700 million that would contain
a 600,000 square foot main exhibit hall with 235,000 square feet of additional
meeting space, which would more than triple the 193,000 square feet currently
available in the Hynes Convention Center. There can be no assurances that this
new convention center will be developed as planned.
 
BOSTON/CAMBRIDGE HOTEL SUBMARKET
 
  The Company's completed Hotel Properties are located in downtown Boston and
in East Cambridge, the latter directly across the Longfellow Bridge from
Boston. The Boston/Cambridge lodging market, at the core of the metropolitan
area, has a total of approximately 13,371 rooms and achieves higher occupancy
and room rates than the Greater Boston market as a whole, with resulting
higher REVPAR, as indicated in the following table which indicates the
performance of that market during the years 1992 through 1996:
 
                  BOSTON/CAMBRIDGE HOTEL SUBMARKET, 1992-1996
 
<TABLE>
<CAPTION>
                                     1992     1993     1994     1995     1996
                                    -------  -------  -------  -------  -------
<S>                                 <C>      <C>      <C>      <C>      <C>
Occupancy..........................    71.5%    74.6%    76.5%    77.4%    78.1%
Average Daily Rate................. $115.25  $118.75  $126.75  $133.00  $143.25
REVPAR............................. $ 82.41  $ 88.59  $ 96.92  $102.88  $111.84
Percent Change.....................              7.5%     9.4%     6.1%     8.7%
Available Room Supply..............  13,069   13,112   13,224   13.359   13,371
Percent Change.....................              0.3%     0.9%     1.0%     0.1%
</TABLE>
- --------
Source: Pinnacle Advisory Group
 
  New additions to the Boston hotel market are underway and anticipated and if
the proposed new convention center is constructed further additions to supply
are expected. The Company believes that business, tourist and convention and
meeting-driven demand will increase as well, supported by major transportation
infrastructure improvements currently underway including the $10.4 billion
Central Artery/Ted Williams Tunnel project (which will improve access to
downtown Boston and Logan International Airport and the urban quality of
downtown Boston) and the $1.2 billion Logan 2000 program (the modernization
and facility expansion of Logan International Airport). The Company also
believes that because of their excellent locations and the advantages of
Marriott(R) brand strength and marketing programs and management, its Hotel
Properties will continue to perform strongly and benefit directly from such
growth in overall demand.
 
SEASONALITY
 
  The Company's two completed hotels traditionally have experienced
significant seasonality in their net operating income, with average weighted
net operating income by quarter over the past three years as follows:
 
<TABLE>
<CAPTION>
     FIRST QUARTER       SECOND QUARTER         THIRD QUARTER         FOURTH QUARTER
     -------------       --------------         -------------         --------------
     <S>                 <C>                    <C>                   <C>
          14%                 30%                    31%                   25%
</TABLE>
 
  MARRIOTT(R) IS A REGISTERED TRADEMARK OF MARRIOTT INTERNATIONAL, INC., WHICH
HAS NOT ENDORSED OR APPROVED THE OFFERING OR ANY OF THE FINANCIAL RESULTS OF
THE HOTELS SET FORTH IN THIS PROSPECTUS. INVESTORS IN THE COMPANY WILL NOT
RECEIVE AN INTEREST IN MARRIOTT INTERNATIONAL, INC.
 
                                      70
<PAGE>
 
          DEVELOPMENT CONSULTING AND THIRD-PARTY PROPERTY MANAGEMENT
 
DEVELOPMENT CONSULTING
 
  Because commercial real estate development is a highly complex and
specialized business, many corporate and government entities that decide to
develop a property primarily for their own use seek a development and project
manager to assist with the design and execution of the project. The Company
has found development consulting and project management to be a desirable way
to leverage the Company's extensive experience in project and construction
management, marketing, leasing, finance, governmental relations, tax, real
estate law, and accounting. The Company's engagement in this type of activity
has three distinct attractions:
 
  .  Development consulting and project management can be a significant
     source of revenue that requires little incremental investment by the
     Company. To support the Company's own activities, the Company's offices
     in Boston and Washington, D.C. are staffed with professionals who are
     able to provide the full range of services needed for project design and
     execution. By taking on third party projects, the Company is able to
     fully utilize the talents of those individuals and add to their
     experience and knowledge base.
 
  .  In addition to being a profitable source of revenue, the Company has
     achieved significant recognition in its primary markets for successful
     oversight of high-visibility projects. The Company believes that such
     recognition has added to the Company's credibility when bidding for
     build-to-suit projects or attempting to significantly pre-lease a
     project under construction.
 
  .  The Company has been successful at retaining clients at the end of
     third-party development projects and becoming the property manager for
     the completed project. These property management engagements are
     excellent sources of incremental revenues without the need for large
     investment or risk.
 
THIRD-PARTY PROPERTY MANAGEMENT AND TENANT SERVICES
 
  The Company generally does not provide third-party property management
services, but the Company has been willing to accept property management
engagements in certain cases where the Company had a pre-existing relationship
with a major tenant or client for whom the Company provided development
services. In Greater Washington, D.C., the Company manages six properties for
third parties. The Company served as development and project manager for all
of these properties.
 
                               PARTIAL INTERESTS
 
  The Company owns less than a 100.0% fee interest in 15 of the Properties.
The Company owns a 25.0% limited liability company membership interest in
three buildings in Reston, Virginia, which the Company is currently developing
in partnership with Westbrook. The Company's economic interest in this
property may be increased above 25.0%, depending upon the achievement of
certain performance objectives. The Company owns a 75.0% partnership interest
and is the sole general partner of the limited partnership that owns 100.0% of
the fee interest in Montvale Center in Gaithersburg, Maryland. Because of the
priority of the Company's 75.0% partnership interest, the Company expects to
receive substantially all of any partnership distributions that are made with
respect to this property. The Company owns a 35.7% controlling general
partnership interest in the nine Hilltop Business Center properties, 560
Forbes Boulevard in South San Francisco, California and 430 Rozzi Place in
South San Francisco, California.
 
                             ENVIRONMENTAL MATTERS
 
  Some of the Properties are located in urban and industrial areas where fill
or current or historical industrial uses of the areas have caused site
contamination. With respect to all of the Properties, independent
environmental consultants have been retained in the past to conduct or update
Phase I environmental assessments (which generally do not involve invasive
techniques such as soil or ground water sampling) and asbestos surveys on all
of the Properties. These environmental assessments have not revealed any
environmental conditions that the
 
                                      71
<PAGE>
 
Company believes will have a material adverse effect on its business, assets
or results of operations, and the Company is not aware of any other
environmental condition with respect to any of the Properties which the
Company believes would have such a material adverse effect.
 
  With respect to 17 Hartwell Avenue in Lexington, Massachusetts, the Company
received a Notice of Potential Responsibility ("NOR") from the state
regulatory authority on January 9, 1997, related to groundwater contamination.
In addition, the Company received a Notice of Downgradient Property Status
Submittal from each of two third parties concerning alleged contamination at
two downgradient properties. 17 Hartwell Avenue is a 30,000 square foot office
building occupied by Kendall Company, a division of Tyco International, which
has been the tenant of the entire building for 20 years. The tenant received a
similar NOR and responded to the state regulatory authority that it would
conduct an investigation. That investigation is underway and has identified
the presence of hazardous substances in a catch basin along the property line.
It is expected that the tenant will take any necessary response actions. The
lease with the tenant contains a provision pursuant to which the tenant
indemnifies the Company against such liability. The Company has notified the
state regulatory authority that it will cooperate with and monitor the
tenant's investigation.
 
  On January 15, 1992, 91 Hartwell Avenue in Lexington, Massachusetts was
listed by the state regulatory authority as an unclassified Confirmed Disposal
Site in connection with groundwater contamination. 91 Hartwell Avenue is a
122,328 square foot office building occupied by five tenants. The Company has
engaged a specially licensed environmental consultant to perform the necessary
investigation and assessment and to prepare submittals to the state regulatory
authority. On August 1, 1997, such consultant submitted to the state
regulatory authority a Phase I -- Limited Site Investigation Report and
Downgradient Property Status Opinion. This Opinion concluded that the property
qualifies for Downgradient Property Status under the state regulatory program.
Downgradient Property Status eliminates certain deadlines for conducting
response actions at a site. Although the Company believes that the current or
former owners of the upgradient source properties may ultimately be
responsible for some or all of the costs of such response actions, the Company
will take any necessary further response actions.
 
  The Company expects that any resolution of the environmental matters
relating to 17 Hartwell Ave. and 91 Hartwell Ave. will not have a material
impact on the financial position, results of operations or liquidity of the
Company.
 
                                      72
<PAGE>
 
                         THE UNSECURED LINE OF CREDIT
 
  Upon the completion of the Initial Offering, the Company entered into a
$300 million Unsecured Line of Credit with BankBoston, as agent, that expires
in June 2000. The Unsecured Line of Credit is a recourse obligation of the
Operating Partnership and is guaranteed by the Company. The Company has used,
and intends to continue to use, the Unsecured Line of Credit principally to
fund growth opportunities and for working capital purposes. As of December 1,
1997, the Company had an outstanding balance of $233.0 million under this line
of credit.
 
  The Company's ability to borrow under the Unsecured Line of Credit is
subject to the Company's ongoing compliance with a number of financial and
other covenants. The Unsecured Line of Credit requires: the Company to
maintain a ratio of unsecured indebtedness to unencumbered property value of
not more than 60%; that the unencumbered properties must generate sufficient
net operating income to maintain a debt service coverage ratio of at least 1.4
to 1 (based on a 25-year amortization with an assumed interest rate equal to
the rate on seven-year U.S. Treasuries plus 2%); a total indebtedness to total
asset value ratio of not more than (i) 65% for the period from November 21,
1997 through April 30, 1998 and (ii) 55% after April 30, 1998; that the ratio
of EBITDA to debt service plus estimated capital expenditures and preferred
dividends be at least 1.75 to 1; and certain other customary covenants and
performance requirements. In addition, the Unsecured Line of Credit restricts
ownership of hotel properties to 25% of the Company's aggregate portfolio. The
Unsecured Line of Credit, except under certain circumstances, limits the
Company's ability to make distributions up to 90% of its annual Funds from
Operations.
 
  The Unsecured Line of Credit, at the Company's election, bears interest at a
floating rate based on a spread over LIBOR equal to (i) 125 basis points
during the period from November 21, 1997 through January 31, 1998, (ii) 140
basis points during the period from February 1, 1998 through April 30, 1998,
and (iii) after April 30, 1998, from 90 basis points to 110 basis points,
depending upon the Company's applicable leverage ratio, or BankBoston's prime
rate. The Unsecured Line of Credit requires monthly payments of interest only
on prime rate loans, with interest on LIBOR loans payable on the last day of
an interest period but not less often than quarterly. LIBOR loans may be for
periods of between thirty and 180 days.
 
                                      73
<PAGE>
 
                                  MANAGEMENT
 
                       DIRECTORS AND EXECUTIVE OFFICERS
 
  Pursuant to the Certificate, the Board of Directors is divided into three
classes of directors. The initial terms of the three classes will expire in
1998 (Mr. Zuckerman), 1999 (Messrs. Patricof and Turchin) and 2000 (Messrs.
Linde and Seidenberg), respectively. Beginning in 1998, directors of each
class will be chosen for three-year terms upon the expiration of their current
terms and each year one class of directors will be elected by the
stockholders. The Company believes that classification of the Board of
Directors helps to assure the continuity and stability of the Company's
business strategies and policies as determined by the Board of Directors.
Holders of shares of Common Stock have no right to cumulative voting in the
election of directors. Consequently, at each annual meeting of stockholders,
the holders of a majority of the shares of Common Stock will be able to elect
all of the successors of the class of directors whose terms expire at that
meeting. A majority of directors are neither employees nor affiliates of the
Company.
 
  The following table sets forth certain information with respect to the
directors and executive officers of the Company as of December 1, 1997:
 
<TABLE>
<CAPTION>
          NAME                                       AGE        POSITION
          ----                                       --- ----------------------
   <S>                                               <C> <C>
   Mortimer B. Zuckerman............................  60 Chairman of the Board
   Edward H. Linde..................................  56 President,
                                                         Chief Executive
                                                         Officer and Director
   Alan J. Patricof.................................  63 Director
   Ivan G. Seidenberg...............................  50 Director
   Martin Turchin...................................  56 Director
   Raymond A. Ritchey...............................  47 Senior Vice President
   Robert E. Burke..................................  60 Senior Vice President
   David R. Barrett.................................  56 Senior Vice President
   Robert E. Selsam.................................  51 Senior Vice President
   David G. Gaw.....................................  46 Senior Vice President,
                                                         Chief Financial
                                                         Officer
</TABLE>
 
  The following is a biographical summary of the experience of the directors
and executive and senior officers of the Company:
 
 Directors and Executive Officers
 
  Mr. Mortimer B. Zuckerman serves as Chairman of the Board of Directors of
the Company. Mr. Zuckerman co-founded the Company in 1970 after spending seven
years at Cabot, Cabot & Forbes where he rose to the position of Senior Vice
President and Chief Financial Officer. He is a graduate of McGill University,
Montreal receiving an undergraduate degree in 1957 and a degree of law in
1961. He received an MBA with distinction from the Wharton School, University
of Pennsylvania in 1961 and a Master of Law from Harvard University in 1962.
Mr. Zuckerman serves as a Trustee for New York University, a Director and
Member of the Executive Committee of WNET/Channel 13 New York, a Trustee of
Memorial Sloan-Kettering Cancer Institute, a Trustee of the Institute For
Advanced Studies at Princeton, a Member of the Harvard Medical School Board of
Visitors, and a Member of the Council on Foreign Relations and the
International Institute For Strategic Studies. He is also Chairman and Editor-
in-Chief of U.S. News & World Report, Chairman of The Atlantic Monthly
magazine, Chairman and Co-Publisher of the New York Daily News and Chairman of
the Board of Applied Graphics Technologies (AGT) and a member of the Board of
Directors of Snyder Communications.
 
  Mr. Edward H. Linde serves as President, Chief Executive Officer and a
Director of the Company. Mr. Linde co-founded the Company in 1970 after
spending five years at Cabot, Cabot & Forbes where he became Vice President
and Senior Project Manager. Mr. Linde serves as Chairman of the Board of
Directors of the
 
                                      74
<PAGE>
 
Massachusetts Government Land Bank and Co-Chairman of the Massachusetts
Development Finance Agency. He is also a member of the Board of Directors of
the CareGroup and the Beth Israel Deaconess Medical Center, an Overseer of the
Boston Symphony Orchestra, and a member of the Board of Fellows of the Harvard
Medical School. Mr. Linde is a member of the Board of Applied Graphics
Technologies (AGT). He received a BS in Civil Engineering from MIT in 1962 and
an MBA from Harvard Business School, where he was a Baker Scholar, in 1964.
 
  Mr. Alan J. Patricof serves as a Director of the Company. Mr. Patricof is
Chairman of the Board of Directors of Patricof & Co. Ventures, Inc., the
company that he founded in 1969. He has more than 30 years of investment
experience with a particular expertise in portfolio management. Mr. Patricof
was Chairman of the White House Commission on the Small Business
Administration and a member of the Blue Ribbon Commission of the National
Association of Corporate Directors. He also serves as a director of Cellular
Communications International, Inc., Cellular Communications of Puerto Rico,
Inc., CoreComm Incorporated, Healthcare Direct, Inc., Johnny Rockets Group,
Inc., Medscape, Inc., NTL Incorporated, and SCP Communications, Inc. Mr.
Patricof received a BS in finance from Ohio State University and an MBA from
Columbia University Graduate School of Business.
 
  Mr. Ivan G. Seidenberg serves as a Director of the Company. Mr. Seidenberg
is Vice Chairman, President and Chief Operating Officer of Bell Atlantic.
Prior to the merger of Bell Atlantic and NYNEX, Mr. Seidenberg was Chairman
and Chief Executive Officer of NYNEX where he held various positions since
1991. Mr. Seidenberg is a member of the Board of Directors of AlliedSignal
Inc., American Home Products Corp., The Conference Board, CVS Corp., Pace
University, The Museum of Television and Radio, The New York Hall of Science,
The New York Hospital and Viacom, Inc., and a director of Bell Atlantic. He is
Chairman of the Federal Communications Commission's Network Reliability and
Interoperability Council and a member of the Council on Foreign Relations and
the Lincoln Center Consolidated Fund Committee. Mr. Seidenberg received a BA
in mathematics from City University of New York and an MBA from Pace
University.
 
  Mr. Martin Turchin serves as a Director of the Company. Since 1985, Mr.
Turchin has served as Vice-Chairman of Insignia/Edward S. Gordon Co., Inc., a
subsidiary of Insignia Financial Group, one of the nation's largest commercial
real estate brokerage and management firms. Mr. Turchin has more than 30 years
experience as a commercial real estate broker, consultant and advisor and has
been involved in some of the largest real estate transactions in the United
States. Mr. Turchin is a three time recipient of the Real Estate Board of New
York's "Most Ingenious Deal of the Year Award." Mr. Turchin attended City
College of the University of New York and St. John's Law School.
 
  Mr. Raymond A. Ritchey serves as a Senior Vice President, Co-Manager of the
Washington office and National Director of Acquisitions and Development for
the Company. In this capacity, Mr. Ritchey is responsible for all marketing
and new opportunity origination in the Washington area and directly oversees
similar activities for the Company on a national basis. Mr. Ritchey joined the
Company in 1980, leading the Company's expansion to become one of the dominant
real estate firms in the Washington metropolitan area. For four years prior to
joining the Company, Mr. Ritchey was one of the leading commercial real estate
brokers in the Washington area with Coldwell Banker. He is a 1972 graduate of
the U.S. Naval Academy and a 1973 graduate of the U.S. Naval Post Graduate
School in Monterey, California.
 
  Mr. Robert E. Burke serves as a Senior Vice President and Co-Manager of the
Washington office for the Company. He joined the Company in 1979 to open its
Washington area office serving as general manager in charge of operations of
that office. Prior to 1979, Mr. Burke spent 7 1/2 years as General Manager of
the John Fitzgerald Kennedy Library Corporation. He received dual degrees in
1960 when he earned a BS from Bates College and a Bachelor of Civil
Engineering degree from Rensselaer Polytechnic Institute.
 
  Mr. David R. Barrett serves as Senior Vice President and Manager of the
Boston office of the Company. He joined the Company in 1976 after six years as
a principal in a consulting firm specializing in housing and urban development
and after serving as Special Assistant to the Administrator of the Housing and
Development Administration of the City of New York. He has been involved in
all aspects of developing the Company's
 
                                      75
<PAGE>
 
portfolio of properties and was directly responsible for the approval, design,
construction and leasing of the Cambridge Center development. Mr. Barrett
received a BA from Columbia College in 1963 and an LLB with honors from
Harvard Law School in 1966 where he was an editor of the Harvard Law Review.
 
  Mr. Robert E. Selsam is a Senior Vice President and Manager of the Company's
New York office. He joined the Company in 1984, prior to which he was Director
of Planning for the Metropolitan Transportation Authority of the State of New
York. Mr. Selsam serves as Secretary and member of the Executive Committee of
the New York Building Congress, is Executive Vice President and past Co-
Chairman of the Associated Builders and Owners of New York, a member of the
Executive Committee of the Association for a Better New York, and Vice
President and Trustee of the New York Foundation for Architecture. He received
a BA from the University of Pennsylvania in 1968 and a MS in Urban Planning
from the Columbia University School of Architecture in 1970. Mr. Selsam has
had direct involvement in all aspects of the Company's New York activities
including development, leasing and building operations.
 
  Mr. David G. Gaw is Senior Vice President and Chief Financial Officer for
the Company, where he oversees a 47-person accounting, control and financial
management department. He joined the Company in 1982 and has been involved in
the Company's financial operations since then, including administering the
Company's financings and banking relationships. From 1978 to 1982 he served as
Vice President for the Norwood Group. Mr. Gaw received a BSBA from Suffolk
University in 1973 and also received an MBA from Suffolk University in 1983.
 
 Senior Officers
 
  Mr. Frederick J. DeAngelis serves as Senior Vice President and General
Counsel for the Company, where he oversees a staff of three lawyers and one
paralegal. Mr. DeAngelis joined the Company in 1980 after serving as a partner
at the firm of Lane & Altman in Boston. He received an AB in Economics (cum
laude) from Holy Cross College in 1970 and a doctor of law degree (magna cum
laude) from Boston College Law School in 1973.
 
  Mr. Stephen R. Clineburg, who joined the Company in 1984, serves as Senior
Vice President and Regional General Counsel, Washington region. From June 1972
through July 1984, Mr. Clineburg was an attorney at the Gulf Oil Corporation
and before that had been a Vice President and Title Officer of the Real Title
Corporation in Fairfax, Virginia. Mr. Clineburg graduated from Columbia
University with a BA in English in 1963 and from the University of Virginia
Law School in Charlottesville in 1966.
 
  Mr. James C. Rosenfeld is a Senior Vice President of the Company, where he
has been responsible for all suburban Boston project development. Prior to
joining the Company in 1980, he worked for ten years at Cabot, Cabot & Forbes
where he served as project manager on major commercial office building
projects. Mr. Rosenfeld received an AB from Bowdoin College in 1965.
 
  Mr. E. Mitchell Norville is Senior Vice President and Senior Project
Manager-Washington for the Company. In that capacity he oversees development
of the Company's projects, including its fee development work for third
parties. He has had direct responsibility for the project management of such
projects as Independence Square, the headquarters for HCFA, and the work being
performed for the National Institute of Health. Mr. Norville joined the
Company in 1984 following his graduation from the University of Virginia with
an MBA. He also received a BS in Mechanical Engineering from Clemson
University in 1980.
 
  Mr. Peter D. Johnston is a Senior Vice President of the Company, where he
has been responsible for the development of more than one million square feet
of the Company's Washington, D.C., commercial projects. He joined Boston
Properties in 1987 after receiving an MBA from the University of Virginia. Mr.
Johnston also received a Bachelor of Business Administration from Roanoke
College in 1981 as well as an MA degree from Hollins College in 1982.
 
  Mr. John D. Camera, Jr. is Senior Vice President--Boston Construction
Management for the Company and in that capacity oversees the Company's Boston
area construction activities. Mr. Camera, who joined the Company in 1980, has
more than 30 years of construction industry experience. He is a 1964 graduate
of the
 
                                      76
<PAGE>
 
Worcester Polytechnic Institute where he received a BS in Civil Engineering.
Following graduation he served in the U.S. Navy Civil Engineering Corps.
During his time at the Company, he has been responsible for more than $325
million of construction activity.
 
  Mr. Jonathan B. Kurtis is Senior Vice President--Washington Construction
Management for the Company. In that capacity he oversees all of the Company's
Washington area construction activities and has been responsible for more than
$517 million of successfully completed construction undertaken by the Company.
Mr. Kurtis joined the Company in 1984 following seven years of general
contractor project management experience. He graduated from the University of
Florida in Gainesville, Florida with a Bachelor of Building Construction in
1977.
 
  Mr. John J. Baraldi is Senior Vice President and National Director of
Property Management at the Company. In that capacity, and based on his 35
years of property management experience, he provides national leadership and
guidance to the property managers responsible for each of the Company's
geographical areas of activity. Mr. Baraldi joined the Company in 1975 after
holding property management positions at Cabot, Cabot & Forbes and the General
Foods Corporation.
 
  Mr. David H. Boone is Senior Vice President and Director of Washington Area
Property Management for the Company. In that capacity, he has direct
responsibility for the property management of the Company's Washington
properties. Mr. Boone joined the Company in 1986 after 23 years experience in
building operations and property management with other firms. Mr. Boone has
also served as commercial Vice President for BOMA (Building Owners & Managers
Association) Washington, D.C. and on the Board of Governors for BOMA
International.
 
  Mr. William J. Wedge serves as Senior Vice President--Tax Counsel for the
Company. He joined Boston Properties in 1984 after serving in the Tax
Department of Coopers & Lybrand. Mr. Wedge graduated from Dartmouth College in
1977 with a B.A. in History and Government, received a JD (cum laude) from
Suffolk Law School in 1981 and was awarded a Masters of Taxation (LLM) by
Boston University Law School in 1984. Mr. Wedge is an Adjunct Professor of Law
at Suffolk Law School. He oversees tax and corporate affairs for the Company.
 
                     COMMITTEES OF THE BOARD OF DIRECTORS
 
 Audit Committee
 
  The Board of Directors has established an Audit Committee consisting of
Messrs. Patricof, Seidenberg and Turchin. The Audit Committee makes
recommendations concerning the engagement of independent public accountants,
reviews with the independent public accountants the scope 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 the Company's internal accounting controls.
 
 Compensation Committee
 
  The Board of Directors has established a Compensation Committee to determine
compensation for the Company's executive officers. The members of the
Compensation Committee are Messrs. Patricof, Seidenberg and Turchin.
 
  The Board of Directors may from time to time establish certain other
committees to facilitate the management of the Company.
 
                           COMPENSATION OF DIRECTORS
 
  The Company pays its non-employee directors annual compensation of $15,000
for their services. In addition, non-employee directors receive a fee of
$1,000 for each Board of Directors meeting attended in person.
 
                                      77
<PAGE>
 
Non-employee directors attending any committee meetings in person receive an
additional fee of $1,000 for each committee meeting attended, unless the
committee meeting is held on the day of a meeting of the Board of Directors.
Non-employee directors also receive an additional fee of $250 for each
telephonic meeting attended. Non-employee directors are also reimbursed for
reasonable expenses incurred to attend director and committee meetings.
Officers of the Company who are directors are not paid any directors' fees.
The Non-employee directors received, upon initial election to the Board of
Directors, an option to purchase 10,000 shares of Common Stock, and annually
thereafter will receive an option to purchase 5,000 shares of Common Stock.
These options will become exercisable over two years.
 
                            EXECUTIVE COMPENSATION
 
  The following table sets forth the total compensation paid in 1996 and the
annual base salary rates and other compensation expected to be paid in 1997 to
the Company's Chief Executive Officer and each of the Company's four other
most highly compensated executive officers (the "Named Executive Officers").
 
                          SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                         LONG TERM
                                                                        COMPENSATION
                                         ANNUAL COMPENSATION               AWARDS
                                  ------------------------------------- ------------
                                                             OTHER       SECURITIES
                                                            ANNUAL       UNDERLYING      ALL OTHER
NAME AND PRINCIPAL POSITION  YEAR SALARY($)    BONUS($) COMPENSATION($)  OPTIONS(#)   COMPENSATION($)
- ---------------------------  ---- ---------    -------- --------------- ------------  ---------------
<S>                          <C>  <C>          <C>      <C>             <C>           <C>
Edward H. Linde.........     1997 $150,000(1)    (2)          (3)         320,000(4)        --
 President and Chief         1996    7,000        --        $12,378(3)       --             --
  Executive Officer
Raymond A. Ritchey......     1997 $250,000(1)    (2)          --          200,000(4)        (5)
 Senior Vice President       1996  292,423        --          --             --           $4,150(5)
Robert E. Burke.........     1997 $250,000(1)    (2)          --          160,000(4)        (5)
 Senior Vice President       1996  313,023        --          --             --           $4,150(5)
David R. Barrett........     1997 $240,000(1)    (2)          --          120,000(4)        (5)
 Senior Vice President       1996  285,493        --          --             --           $4,150(5)
Robert E. Selsam........     1997 $221,500(1)  $42,225        --           80,000(4)        (5)
 Senior Vice President       1996  220,324      42,654        --             --           $4,150(5)
</TABLE>
- --------
(1) Represents rate of annual base salary for 1997 that has been in effect
    since the completion of the Initial Offering.
(2) 1997 bonus will be determined by the Board of Directors in its discretion.
(3) Represents the Company's contribution toward Mr. Linde's automobile
    expenses. The Company anticipates that this amount will remain
    approximately the same in 1997.
(4) One third of these options are exercisable on each of the third, fourth
    and fifth anniversary of the Initial Offering.
(5) 1996 amounts include the Company's matching contribution under its 401(k)
    plan ($4,000 per individual) and the Company's cost of term life insurance
    (approximately $150 per individual). The Company anticipates that 1997
    amounts will be approximately the same.
 
 
                                      78
<PAGE>
 
                       OPTION GRANTS IN FISCAL YEAR 1997
<TABLE>
<CAPTION>
                                                                     POTENTIAL REALIZABLE
                                      INDIVIDUAL GRANTS                VALUE AT ASSUMED
                         -------------------------------------------   ANNUAL RATES OF
                                  PERCENT OF                             SHARE PRICE
                                 TOTAL OPTIONS  EXERCISE               APPRECIATION FOR
          NAME           OPTIONS  GRANTED TO       OR                    OPTION TERM
          ----           GRANTED EMPLOYEES IN  BASE PRICE EXPIRATION --------------------
                         (#)(1)   FISCAL YEAR    ($/SH)      DATE      5%($)     10%($)
                         ------- ------------- ---------- ---------- --------- ----------
<S>                      <C>     <C>           <C>        <C>        <C>       <C>
Edward H. Linde......... 320,000     16.4%       25.00       (2)     5,030,400 12,748,800
Raymond A. Ritchey...... 200,000     10.3        25.00       (2)     3,144,000  7,968,000
Robert E. Burke......... 160,000      8.2        25.00       (2)     2,515,200  6,374,000
David R. Barrett........ 120,000      6.2        25.00       (2)     1,886,400  4,780,800
Robert E. Selsam........  80,000      4.1        25.00       (2)     1,257,600  3,187,200
</TABLE>
- --------
(1) One third of these options are exercisable on each of the third, fourth
    and fifth anniversary of the Initial Offering.
(2)The expiration date of the options is June 23, 2007.
 
  Mr. Zuckerman, Chairman of the Board, also received a grant of 320,000
options on the same terms and with the same realizable values as Mr. Linde.
 
                   EMPLOYMENT AND NONCOMPETITION AGREEMENTS
 
  Mr. Linde, as President and Chief Executive Officer, has an employment and
noncompetition agreement with the Company (the "Employment Agreement").
Pursuant to the Employment Agreement, until the third anniversary of the
Initial Offering, Mr. Linde will devote substantially all of his business time
to the business and affairs of the Company. Mr. Linde receives an annual base
salary of $150,000 and is eligible for bonus compensation, including stock
options, to be determined in the discretion of the Board of Directors. Mr.
Linde's employment with the Company may be terminated for "cause" by the
Company for: (i) gross negligence or willful misconduct; (ii) an uncured
breach of any of his material duties under the Employment Agreement; (iii)
fraud or other conduct against the material best interests of the Company; or
(iv) a conviction of a felony if such conviction has a material adverse effect
on the Company. Mr. Linde may terminate his employment for "good reason,"
which includes: (i) a substantial adverse change in the nature or scope of his
responsibilities and authority under the Employment Agreement or (ii) an
uncured breach by the Company of any of its material obligations under the
Employment Agreement. If Mr. Linde's employment is terminated by the Company
"without cause" or by Mr. Linde for "good reason," then Mr. Linde will be
entitled to a severance amount equal to the product of (x) his base salary
plus prior year's bonus multiplied by (y) the number of full and fractional
years that the noncompetition agreement described below is in effect (but in
any event at least one year's base salary plus prior year's bonus).
 
  The Employment Agreement prohibits Mr. Linde while he is a director or an
officer of the Company and for one year thereafter, but in any event until the
third anniversary of the Initial Offering, from (i) engaging, directly or
indirectly, in the acquisition, development, construction, operation,
management, or leasing of any commercial real estate property, (ii)
intentionally interfering with the Company's relationships with its tenants,
suppliers, contractors, lenders or employees or with any governmental agency,
or (iii) soliciting the Company's tenants or employees. Pursuant to the
Employment Agreement, however, Mr. Linde may engage in minority interest
passive investments which include the acquisition, holding, and exercise of
voting rights associated with investments made through (i) the purchase of
securities that represent a non-controlling, minority interest in an entity or
(ii) the lending of money, but without management of the property or business
to which such investment directly or indirectly relates and without any
business or strategic consultation with such entity. In addition, Mr. Linde
may participate as an officer or director of any charitable organization, and
he may continue to own and operate the one Personal Property. The period that
this noncompetition agreement is in effect may be terminated prematurely by
the Company which will reduce the severance amount payable to Mr. Linde. In
addition, the agreement provides that the noncompetition provision shall not
apply if Mr. Linde's employment is terminated following certain changes of
control of the Company; in such event, the severance amount payable to Mr.
Linde
 
                                      79
<PAGE>
 
will be determined by reference to the period of time that the noncompetition
provision would have been in effect in the absence of such a change of
control. See "Policies with Respect to Certain Activities--Conflict of
Interest Policies--Excluded Property."
 
  Messrs. Barrett, Burke, Ritchey, Rosenfeld and Selsam have employment
agreements with the Company similar to that of Mr. Linde, except that the
geographic scope of their noncompetition provisions is limited to the
Company's markets at the time of termination of their employment. In addition,
Mr. Zuckerman is a party to an agreement with the Company that contains
noncompetition provisions of the same scope and duration as the noncompetition
provisions of Mr. Linde's Employment Agreement. The Company will continue to
be subject during the term of Mr. Selsam's employment to an agreement dated
August 10, 1995 pursuant to which (i) he was paid $35,000 on August 1, 1997
and (ii) he is paid 5% of the management fees earned on 90 Church Street, a
property managed by the Company.
 
          COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
  The Company has established a Compensation Committee consisting of Messrs.
Seidenberg, Patricof and Turchin, none of whom was or is an officer or
employee of the Company. As the compensation of the Company's senior officers
for 1997 was established at the time of the Initial Offering, the Compensation
Committee did not meet during 1997. None of such persons had any relationships
requiring disclosure under applicable rules and regulations.
 
                               STOCK OPTION PLAN
 
  The Company has adopted the Boston Properties, Inc. 1997 Stock Option and
Incentive Plan (the "Plan") to provide incentives to attract and retain
executive officers, directors, employees and other key personnel. The Plan is
administered by the Compensation Committee. The maximum number of shares
available for issuance under the Plan is 9.5% of the total number of shares of
Common Stock and OP Units (other than OP Units owned by the Company)
outstanding from time to time. After the completion of the Offering, there
will be 6,331,880 shares reserved for issuance under the Plan.
 
  The following summary of the Plan is qualified in its entirety by reference
to the full text of the Plan, a copy of which has been filed with the
Securities and Exchange Commission as an exhibit to the Registration Statement
of which this Prospectus is a part.
 
  The Plan permits the granting of (i) options to purchase Common Stock
intended to qualify as incentive stock options ("Incentive Options") under
Section 422 of the Code and (ii) options that do not so qualify ("Non-
Qualified Options"). The option exercise price of each option will be
determined by the Committee but may not be less than 100% of the fair market
value of the Common Stock on the date of grant in the case of incentive stock
options, and may not be less than 25% of the fair market value of the Common
Stock on the date of grant in the case of Non-Qualified Options. Plan
participants may elect, with the consent of the Committee, to receive
discounted Non-Qualified Options in lieu of cash compensation.
 
  The term of each option will be fixed by the Committee and may not exceed
ten years from date of grant in the case of an Incentive Option. The Committee
will determine at what time or times each option may be exercised and, subject
to the provisions of the Plan, the period of time, if any, after retirement,
death, disability or termination of employment during which options may be
exercised. Options may be made exercisable in installments, and the
exercisability of options may be accelerated by the Committee.
 
  At the discretion of the Committee, stock options granted under the Plan may
include a "re-load" feature pursuant to which an optionee exercising an option
by the delivery of shares of Common Stock would automatically be granted an
additional stock option (with an exercise price equal to the fair market value
of the
Common Stock on the date the additional stock option is granted) to purchase
that number of shares of Common Stock equal to the number delivered to
exercise the original stock option. The purpose of this feature is to enable
participants to maintain an equity interest in the Company without dilution.
 
                                      80
<PAGE>
 
  To qualify as Incentive Options, options must meet additional Federal tax
requirements, including limits on the value of shares subject to Incentive
Options which first become exercisable in any one calendar year, and a shorter
term and higher minimum exercise price in the case of certain large
stockholders.
 
  The Plan provides for the automatic grant of Non-Qualified Options to non-
employee directors. Each non-employee director received, upon initial election
to the Board of Directors, a Non-Qualified Option to acquire 10,000 shares of
Common Stock. Each non-employee director who is serving as a director of the
Company on the fifth business day after each annual meeting of shareholders,
beginning with the 1998 annual meeting, will automatically be granted on such
day a Non-Qualified Option to acquire 5,000 shares of Common Stock. The
exercise price of each such Non-Qualified Option is the fair market value of
the Common Stock on the date of grant. One-half of each Non-Qualified Option
shall be exercisable on each of the first and second anniversary date of
grant. The Committee may also grant additional Non-Qualified Options to non-
employee directors.
 
  The Committee may also award, subject to such conditions and restrictions as
the Committee may determine, shares of Common Stock; deferred stock units
which are ultimately payable in the form of shares of Common Stock;
performance share awards to participants entitling the participants to receive
shares of Common Stock upon the achievement of individual or Company
performance goals; dividend equivalent rights, which entitle the recipient to
receive credits for dividends that would be paid if the recipient had held
specified shares of Common Stock; awards of capital stock other than Common
Stock and other awards that are valued in whole or in part by reference to or
are otherwise based on, Common Stock.
 
  The Committee may provide in each award agreement that the award becomes
fully vested and non-forfeitable if, after a Change of Control of the Company
(as defined in the Plan), the participant's employment is terminated by the
Company (or its successor) without cause, or if the participant voluntarily
resigns for "good reason" (as defined in the Plan).
 
NEW PLAN BENEFITS
 
  Approximately 175 employees and four non-employee directors are currently
eligible to participate in the Plan. The table below shows the options that
were granted to current employees and non-employee directors in connection
with the Offering.
 
                     1997 STOCK OPTION AND INCENTIVE PLAN
 
<TABLE>
<CAPTION>
                                                           NUMBER OF SHARES
     NAME AND POSITION                                UNDERLYING STOCK OPTION(1)
     -----------------                                --------------------------
     <S>                                              <C>
     Mortimer B. Zuckerman...........................           320,000
      Chairman
     Edward H. Linde.................................           320,000
      President and Chief Executive Officer
     Executive Group (6 persons).....................           930,000
     Non-Employee Director Group (4 persons).........           350,000
     Non-Executive Officer Employee Group
      (approximately 157 persons)....................         1,017,600
</TABLE>
- --------
(1) All options were granted to the employees and the non-employee directors
    at the Initial Offering price of $25.00. In general, one-third of the
    options granted to officers and Mr. Zuckerman will be exercisable on each
    of the third, fourth and fifth anniversary of the date of grant,
    respectively. One-third of the options granted to employees who are not
    officers will be exercisable on each of the first, second and third
    anniversary of the date of grant, respectively. Other than the options
    granted to Mr. Zuckerman as described above, one-half of the options
    granted to non-employee directors will be exercisable on each of the first
    and second anniversary date of grant, respectively.
 
                                      81
<PAGE>
 
TAX ASPECTS UNDER THE U.S. INTERNAL REVENUE CODE
 
  The following is a summary of the principal Federal income tax consequences
of option grants under the Plan. It does not describe all Federal tax
consequences under the Plan, nor does it describe state or local tax
consequences.
 
INCENTIVE OPTIONS
 
  Under the Code, an employee will not realize taxable income by reason of the
grant or the exercise of an Incentive Option. If an employee exercises an
Incentive Option and does not dispose of the shares until the later of (a) two
years from the date the option was granted or (b) one year from the date the
shares were transferred to the employee, the entire gain, if any, realized
upon disposition of such shares will be taxable to the employee as long-term
capital gain, and the Company will not be entitled to any deduction. If an
employee disposes of the shares within such one-year or two-year period in a
manner so as to violate the holding period requirements (a "disqualifying
disposition"), the employee generally will realize ordinary income in the year
of disposition, and, provided the Company complies with applicable withholding
requirements, the Company will receive a corresponding deduction, in an amount
equal to the excess of (1) the lesser of (x) the amount, if any, realized on
the disposition and (y) the fair market value of the shares on the date the
option was exercised over (2) the option price. Any additional gain realized
on the disposition of the shares acquired upon exercise of the option will be
long-term or short-term capital gain and any loss will be long-term or short-
term capital loss depending upon the holding period for such shares. The
employee will be considered to have disposed of his shares if he sells,
exchanges, makes a gift of or transfers legal title to the shares (except by
pledge or by transfer on death). If the disposition of shares is by gift and
violates the holding period requirements, the amount of the employee's
ordinary income (and the Company's deduction) is equal to the fair market
value of the shares on the date of exercise less the option price. If the
disposition is by sale or exchange, the employee's tax basis will equal the
amount paid for the shares plus any ordinary income realized as a result of
the disqualifying distribution. The exercise of an Incentive Option may
subject the employee to the alternative minimum tax.
 
  Special rules apply if an employee surrenders shares of Common Stock in
payment of the exercise price of his Incentive Option.
 
  An Incentive Option that is exercised by an employee more than three months
after an employee's employment terminates will be treated as a Non-Qualified
Option for Federal income tax purposes. In the case of an employee who is
disabled, the three-month period is extended to one year and in the case of an
employee who dies, the three-month employment rule does not apply.
 
NON-QUALIFIED OPTIONS
 
  There are no Federal income tax consequences to either the optionee or the
Company on the grant of a Non-Qualified Option. On the exercise of a Non-
Qualified Option, the optionee has taxable ordinary income equal to the excess
of the fair market value of the Common Stock received on the exercise date
over the option price of the shares. The optionee's tax basis for the shares
acquired upon exercise of a Non-Qualified Option is increased by the amount of
such taxable income. The Company will be entitled to a Federal income tax
deduction in an amount equal to such excess. Upon the sale of the shares
acquired by exercise of a Non-Qualified Option, the optionee will realize
long-term or short-term capital gain or loss depending upon his or her holding
period for such shares.
 
  Special rules apply if an optionee surrenders shares of Common Stock in
payment of the exercise price of a Non-Qualified Option.
 
                  LIMITATION OF LIABILITY AND INDEMNIFICATION
 
  The Company's directors and officers are and will be indemnified against
certain liabilities under Delaware law, the Certificate of Incorporation and
Bylaws of the Company and the Operating Partnership Agreement. The Certificate
of Incorporation of the Company requires the Company to indemnify its
directors and officers to the fullest extent permitted from time to time under
Delaware law.
 
                                      82
<PAGE>
 
  The Bylaws provide that directors and officers of the Company shall be, and,
in the discretion of the Board of Directors, non-officer employees may be,
indemnified by the Company to the fullest extent authorized by Delaware law,
as it now exists or may in the future be amended, against all expenses and
liabilities reasonably incurred in connection with service for or on behalf of
the Company. The Bylaws also provide that the right of directors and officers
to indemnification shall be a contract right and shall not be exclusive of any
other right now possessed or hereafter acquired under any bylaw, agreement,
vote of stockholders or otherwise. The Certificate contains a provision
permitted by Delaware law that generally eliminates the personal liability of
directors for monetary damages for breaches of their fiduciary duty, including
breaches involving negligence or gross negligence in business combinations,
unless the director has breached his or her duty of loyalty, failed to act in
good faith, engaged in intentional misconduct or a knowing violation of law,
paid a dividend or approved a stock repurchase in violation of the Delaware
General Corporation Law ("DGCL") or obtained an improper personal benefit. The
provision does not alter a director's liability under the federal securities
laws. In addition, this provision does not affect the availability of
equitable remedies, such as an injunction or rescission, for breach of
fiduciary duty. The Company believes that this provision will assist the
Company in attracting and retaining qualified individuals to serve as officers
and directors.
 
  The Operating Partnership Agreement also provides for indemnification of the
Company and its directors and officers to the same extent indemnification is
provided to directors and officers of the Company in the Company's Certificate
and limits the liability of the Company and its directors and officers to the
Operating Partnership and its partners, to the same extent that the liability
of directors and officers of the Company to the Company and its stockholders
is limited under their organizational documents.
 
                          INDEMNIFICATION AGREEMENTS
 
  The Company has entered into indemnification agreements with each of its
directors and executive officers. The indemnification agreements require,
among other things, that the Company indemnify its directors and executive
officers to the fullest extent permitted by law and advance to the directors
and executive officers all related expenses, subject to reimbursement if it is
subsequently determined that indemnification is not permitted. Under these
agreements, the Company must also indemnify and advance all expenses incurred
by directors and executive officers seeking to enforce their rights under the
indemnification agreements and may cover directors and executive officers
under the Company's directors' 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 directors and executive officers that indemnification
will be available.
 
                             CERTAIN TRANSACTIONS
 
  Prior to the Initial Offering, Messrs. Zuckerman and Linde made loans
totaling $40.5 million to entities that, owned certain development properties
and parcels of land that the Company succeeded to the ownership of at the
completion of the Offering. Such loans bore interest at an annual rate of
9.25%, which interest was capitalized over the period that such loans have
been outstanding. At the completion of the Initial Offering, the balance of
such loans was approximately $42.8 million, which balance was repaid at the
completion of the Initial Offering with amounts drawn under the Unsecured Line
of Credit.
 
                                      83
<PAGE>
 
                  POLICIES WITH RESPECT TO CERTAIN ACTIVITIES
 
  The following is a discussion of certain investment, financing and other
policies of the Company. These policies have been determined by the Company's
Board of Directors and, in general, may be amended or revised from time to
time by the Board of Directors without a vote of the stockholders.
 
                              INVESTMENT POLICIES
 
INVESTMENT IN REAL ESTATE OR INTERESTS IN REAL ESTATE
 
  The Company conducts all of its investment activities through the Operating
Partnership and its affiliates. The Company's investment objectives are to
provide quarterly cash distributions and achieve long-term capital
appreciation through increases in the value of the Company. The Company has
not established a specific policy regarding the relative priority of these
investment objectives. For a discussion of the Properties and the Company's
acquisition and other strategic objectives, see "Business and Properties" and
"Business and Growth Strategies."
 
  The Company expects to continue to pursue its investment objectives
primarily through the ownership by the Operating Partnership of the Properties
and other acquired properties. The Company currently intends to continue to
invest primarily in developments of commercial properties and acquisitions of
existing improved properties or properties in need of redevelopment, and
acquisitions of land which the Company believes has development potential.
Future investment or development activities will not be limited to any
geographic area or product type or to a specified percentage of the Company's
assets. While the Company intends to continue to diversify in terms of
property locations, size and market, the Company does not have any limit on
the amount or percentage of its assets that may be invested in any one
property or any one geographic area. The Company intends to engage in such
future investment or development activities in a manner that is consistent
with the maintenance of its status as a REIT for federal income tax purposes.
In addition, the Company may purchase or lease income-producing commercial and
other types of properties for long-term investment, expand and improve the
real estate presently owned or other properties purchased, or sell such real
estate properties, in whole or in part, when circumstances warrant. The
Company does not have a policy that restricts the amount or percentage of
assets that will be invested in any specific property.
 
  The Company may also continue to participate with third parties in property
ownership, through joint ventures or other types of co-ownership. Such
investments may permit the Company to own interests in larger assets without
unduly restricting diversification and, therefore, add flexibility in
structuring its portfolio. The Company will not, however, enter into a joint
venture or partnership to make an investment that would not otherwise meet its
investment policies.
 
  Equity investments may be subject to existing mortgage financing and other
indebtedness or such financing or indebtedness as may be incurred in
connection with acquiring or refinancing these investments. Debt service on
such financing or indebtedness will have a priority over any distributions
with respect to the Common Stock. Investments are also subject to the
Company's policy not to be treated as an investment company under the
Investment Company Act of 1940, as amended (the "1940 Act").
 
INVESTMENTS IN REAL ESTATE MORTGAGES
 
  While the Company's current portfolio consists of, and the Company's
business objectives emphasize, equity investments in commercial real estate,
the Company may, at the discretion of the Board of Directors, invest in
mortgages and other types of real estate interests consistent with the
Company's qualification as a REIT. The Company does not presently intend to
invest in mortgages or deeds of trust, but may invest in participating or
convertible mortgages if the Company concludes that it may benefit from the
cash flow or any appreciation in value of the property. Investments in real
estate mortgages run the risk that one or more borrowers may default under
such mortgages and that the collateral securing such mortgages may not be
sufficient to enable the Company to recoup its full investment.
 
 
                                      84
<PAGE>
 
SECURITIES OR INTERESTS IN PERSONS PRIMARILY ENGAGED IN REAL ESTATE ACTIVITIES
AND OTHER ISSUERS
 
  Subject to the percentage of ownership limitations and gross income tests
necessary for REIT qualification, the Company also may invest in securities of
other REITs, other entities engaged in real estate activities or securities of
other issuers, including for the purpose of exercising control over such
entities.
 
                                 DISPOSITIONS
 
  The Company does not currently intend to dispose of any of the Properties,
although it reserves the right to do so if, based upon management's periodic
review of the Company's portfolio, the Board of Directors determines that such
action would be in the best interests of the Company. Any decision to dispose
of a Property will be made by the Company and approved by a majority of the
Board of Directors. The tax consequences of the disposition of the Properties
may, however, influence the decision of certain directors and executive
officers of the Company who hold OP Units as to the desirability of a proposed
disposition. See "Policies with Respect to Certain Activities--Conflict of
Interest Policies" and "Operating Partnership Agreement--Tax Protection
Provisions."
 
                              FINANCING POLICIES
 
  The Company does not have a policy limiting the amount of indebtedness that
the Company may incur. In addition, the Certificate and Bylaws do not limit
the amount or percentage of indebtedness that the Company may incur. The
Company has not established any limit on the number or amount of mortgages
that may be placed on any single property or on its portfolio as a whole.
 
  The Board of Directors will consider a number of factors when evaluating the
Company's level of indebtedness and when making decisions regarding the
incurrence of indebtedness, including the purchase price of properties to be
acquired with debt financing, the estimated market value of its properties
upon refinancing and the ability of particular properties and the Company as a
whole to generate cash flow to cover expected debt service. See "Risk
Factors--Impact of Debt on the Company" and "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Liquidity and
Capital Resources."
 
                         CONFLICT OF INTEREST POLICIES
 
  Certain holders of OP Units, including Messrs. Zuckerman and Linde, will
incur adverse tax consequences upon the sale of certain of the Properties
owned by the Company and on the repayment of indebtedness which are different
from the tax consequences to the Company and persons who purchase shares of
Common Stock in the Offering. Consequently, such holders may have different
objectives regarding the appropriate pricing and timing of any such sale or
repayment of indebtedness. While the Company will have the exclusive authority
under the Operating Partnership Agreement to determine whether, when, and on
what terms to sell a Property (other than a Designated Property) or when to
refinance or repay indebtedness, any such decision would require the approval
of the Board of Directors. As Directors of the Company, Messrs. Zuckerman and
Linde have substantial influence with respect to any such decision, and such
influence could be exercised in a manner inconsistent with the interests of
some, or a majority, of the Company's stockholders, including in a manner
which could prevent completion of a Property sale or the repayment of
indebtedness.
 
  In this connection, the Operating Partnership Agreement provides that, until
June 23, 2007, the Operating Partnership may not sell or otherwise transfer a
Designated Property (defined as One and Two Independence Square, 599 Lexington
Avenue and Capital Gallery, or a successor property acquired in a like-kind
exchange for such a property) in a taxable transaction without the prior
consent of Messrs. Zuckerman and Linde. Similarly, the Company has agreed with
the party that contributed 875 Third Avenue to the Operating Partnership that
the Company will not sell or otherwise transfer that Property or a successor
property in a taxable transaction until November 21, 2007 without the consent
of that party. For the pro forma nine months ended September 30, 1997, the
Designated Properties and 875 Third Avenue comprised approximately 27.7% of
the Company's pro forma
 
                                      85
<PAGE>
 
Funds from Operations. The Operating Partnership is not, however, required to
obtain this consent from the party protected thereby if at any time during the
applicable period the protected party does not continue to hold at least 30%
of such party's original OP Units.
 
  In addition to the foregoing, the Operating Partnership agreed to undertake
to use its reasonable commercial efforts to cause its lenders to permit
Messrs. Zuckerman and Linde to guarantee additional and/or substitute
Operating Partnership indebtedness following the Initial Offering if Messrs.
Zuckerman or Linde would recognize gain following the Offering as a result of
the refinancing of the Operating Partnership's indebtedness. The Operating
Partnership is under no obligation, however, to maintain any specified debt or
any specified level of indebtedness. See "Operating Partnership Agreement--Tax
Protection Provisions" for a more complete description of these provisions.
 
  The Company has adopted certain policies that are designed to eliminate or
minimize certain potential conflicts of interest. In addition, the Company's
Board of Directors is subject to certain provisions of Delaware law, which are
also designed to eliminate or minimize conflicts. However, there can be no
assurance that these policies or provisions of law will always be successful
in eliminating the influence of such conflicts, and if they are not
successful, decisions could be made that might fail to reflect fully the
interests of all stockholders.
 
  The Company has adopted a policy that, without the approval of a majority of
the disinterested directors, it will not (i) acquire from or sell to any
director, officer or employee of the Company, or any entity in which a
director, officer or employee of the Company has an economic interest of more
than five percent or a controlling interest, or acquire from or sell to any
affiliate of any of the foregoing, any of the assets or other property of the
Company, (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.
 
  Pursuant to Delaware law, a contract or other transaction between the
Company and a Director or between the Company and any other corporation or
other entity in which a Director is a director or has a material financial
interest is not void or voidable solely on the grounds of such common
directorship or interest, the presence of such Director at the meeting at
which the contract or transaction is authorized, approved or ratified or the
counting of the Director's vote in favor thereof if (i) the material facts
relating to the common directorship or interest and as to the transaction are
disclosed to the Board of Directors or a committee of the Board, and the Board
or committee in good faith authorizes the transaction or contract by the
affirmative vote of a majority of disinterested directors, even if the
disinterested directors constitute less than a quorum, or (ii) the material
facts relating to the common directorship or interest and as to the
transaction are disclosed to the shareholders entitled to vote thereon, and
the transaction is approved in good faith by vote of the shareholders, or
(iii) the transaction or contract is fair and reasonable to the Company at the
time it is authorized, ratified or approved.
 
  See "Risk Factors--Conflicts of Interests."
 
                               PERSONAL PROPERTY
 
  Upon the completion of the Initial Offering the Operating Partnership
succeeded to all but one of the properties managed by the Company or in which
the Company or affiliates of the Company, including Messrs. Zuckerman and
Linde, held ownership interests. One property (the "Personal Property") was
not contributed to the Company in the Initial Offering. The Personal Property
was Sumner Square, a four building office complex located in Washington, D.C.,
NW (203,765 net rentable square feet).
 
  Since the Personal Property is located in the same market as certain of the
the Company's Properties, it may compete with such Properties. The Personal
Property is managed by the Company in return for a management fee with
customary terms that are approved by the Company's independent directors. In
1996, the management fee paid with respect to the Personal Property was
approximately $314,000. There is no assurance, however, that the Personal
Property will continue to be managed by the Operating Partnership or the
Development and Management Company or that fiduciary obligations will not
require Messrs. Zuckerman and Linde, from time to time, to devote a
significant amount of their time to the Personal Property. See "Risk Factors--
Conflicts of Interest."
 
  The partnership that owns the Personal Property and in which Messrs.
Zuckerman and Linde and other affiliates of the Company hold indirect
ownership interests (the "Partnership") has granted the Company an option to
acquire the Personal Property for a cash price equal to the sum of (i) $1.00
over the outstanding
 
                                      86
<PAGE>
 
indebtedness of the Partnership (to the extent not assumed by the Company),
(ii) the net cash capital contributions made by the partners of the
Partnership after June 23, 1997, with interest thereon, (iii) any expenses
associated with the sale (not to exceed $50,000), and (iv) real estate taxes
incurred in connection with the transfer of the Personal Property.
 
                   POLICIES WITH RESPECT TO OTHER ACTIVITIES
 
  The Company has authority to offer Common Stock, Preferred Stock or options
to purchase stock in exchange for property and to repurchase or otherwise
acquire its Common Stock or other securities in the open market or otherwise,
and the Company may engage in such activities in the future. As described
under "Operating Partnership Agreement--Redemption of OP Units," the Company
expects (but is not obligated) to issue Common Stock to holders of OP Units in
the Operating Partnership upon exercise of their redemption rights. The
Company has in the past issued Common Stock and OP Units in exchange for
properties. The Board of Directors has no present intention of causing the
Company to repurchase any Common Stock. The Company may issue Preferred Stock
from time to time, in one or more series, as authorized by the Board of
Directors without the need for stockholder approval. See "Description of
Capital Stock--Preferred Stock." The Company has not engaged in trading,
underwriting or agency distribution or sale of securities of other issuers
other than the Operating Partnership and does not intend to do so. At all
times, the Company intends to make investments in such a manner as to qualify
as a REIT, unless because of circumstances or changes in the Code (or the
Treasury Regulations), the Board of Directors determines that it is no longer
in the best interest of the Company to qualify as a REIT. The Company has not
made any loans to third parties, although it may in the future make loans to
third parties, including, without limitation, to joint ventures in which it
participates. The Company intends to make investments in such a way that it
will not be treated as an investment company under the 1940 Act. The Company's
policies with respect to such activities may be reviewed and modified or
amended from time to time by the Company's Board of Directors without a vote
of the stockholders.
 
                    STRUCTURE AND FORMATION OF THE COMPANY
 
                            FORMATION TRANSACTIONS
 
  Prior to the completion of the Initial Offering, each Property that was
owned by the Company at the completion of the Initial Offering was owned by a
partnership (a "Property Partnership") of which Messrs. Zuckerman and Linde
and others affiliated with Boston Properties, Inc. controlled the managing
general partner and, in most cases, a majority economic interest. The other
direct or indirect investors in the Property Partnerships included persons
formerly affiliated with Boston Properties, Inc., as well as private investors
(including former owners of the land on which the Properties were developed)
who were not affiliated with Boston Properties, Inc.
 
  Prior to or simultaneously with the completion of the Initial Offering, the
Company engaged in the transactions described below (the "Formation
Transactions"), which were designed to consolidate the ownership of the
Properties and the commercial real estate business of the Company in the
Operating Partnership, to facilitate the Initial Offering and to enable the
Company to qualify as a REIT for federal income tax purposes commencing with
the taxable year ending December 31, 1997.
 
  .  Boston Properties, Inc., a Massachusetts company ("BP-Massachusetts")
     that was founded in 1970, was reorganized to change its jurisdiction of
     organization to Delaware. This reorganization was effected by merging
     BP-Massachusetts with and into Boston Properties, Inc., a Delaware
     corporation ("BP-Delaware"), immediately prior to the completion of the
     Initial Offering.
 
  .  The Company sold 36,110,000 shares of Common Stock in the Initial
     Offering and contributed approximately $846.4 million, the net proceeds
     of the Initial Offering, to the Operating Partnership in exchange for an
     equivalent number of OP Units.
 
 
                                      87
<PAGE>
 
  .  Pursuant to one or more option, contribution or merger agreements, (i)
     certain Property Partnerships contributed Properties to the Operating
     Partnership, or merged into and with the Operating Partnership, in
     exchange for OP Units and the assumption of debt, and the partners of
     such Property Partnerships received such OP Units either directly as
     merger consideration or as a distribution from the Property Partnership,
     and (ii) certain persons, both affiliated and not affiliated with the
     Company, contributed their direct and indirect interests in certain
     Property Partnerships to the Operating Partnership in exchange for OP
     Units.
 
  .  Prior to the completion of the Initial Offering, the Company contributed
     substantially all of its Greater Washington, D.C. third-party property
     management business to Boston Properties Management, Inc. (the
     "Development and Management Company"), a subsidiary of the Operating
     Partnership. In order to retain qualification as a REIT, the Operating
     Partnership owns a 1.0% voting interest, and holds a 95.0% economic
     interest, in the Development and Management Company. The remaining
     voting and economic interest is held by officers and directors of the
     Development and Management Company. In addition, the other management
     and development operations of the Company were contributed to the
     Operating Partnership.
 
  .  In connection with the transactions described in the preceding two
     paragraphs, the Operating Partnership issued a total of 18,650,000 OP
     Units.
 
  .  With respect to direct or indirect contributions of interests to the
     Property Partnerships, the Operating Partnership assumed all the rights,
     obligations and responsibilities of the holders of such interests. Any
     working capital or other cash balance of the Property Partnership as of
     immediately prior to the Initial Offering was distributed to the holders
     of such interests prior to the contribution to the Operating
     Partnership. The contribution agreements with respect to such interests
     generally contained representations only with respect to the ownership
     of such interests by the holders thereof and certain other limited
     matters.
 
  .  The Operating Partnership entered into a participating lease with ZL
     Hotel LLC. Marriott International, Inc. continues to manage the Hotel
     Properties under the Marriott(R) name pursuant to management agreements
     with ZL Hotel LLC. Messrs. Zuckerman and Linde are the sole member-
     managers of the lessee and own a 9.8% economic interest in ZL Hotel LLC.
     ZL Hotel Corp. owns the remaining 90.2% economic interest in ZL Hotel
     LLC. Two unaffiliated public charities own all of the capital stock of
     ZL Hotel Corp.
 
  .  Approximately $707.1 million of the net proceeds of the Initial
     Offering, together with $57.7 million drawn under the Unsecured Line of
     Credit, was used by the Operating Partnership to acquire the Newport
     Office Park Property, repay certain mortgage indebtedness secured by the
     Properties and to refinance existing indebtedness with respect to the
     certain development properties and certain parcels of land, the interest
     on which will continue to be capitalized during the development period.
 
  As a result of the Formation Transactions, (i) the Company owned 38,693,541
OP Units, which represented an approximately 70.7% economic interest in the
Operating Partnership, and Messrs. Zuckerman and Linde and other persons with
a direct or indirect interest in the Property Partnerships owned 16,066,459 OP
Units, which represented the remaining approximately 29.3% economic interest
in the Operating Partnership and (ii) the Company indirectly owned a fee
interest in all of the Properties. At the completion of the Formation
Transactions, Messrs. Zuckerman and Linde owned an aggregate of 15,972,611
shares of Common Stock and OP Units.
 
 
                                      88
<PAGE>
 
  No independent third-party appraisals, valuations or fairness opinions were
obtained by the Company in connection with the Formation Transactions. In
forming the Company, the Company succeeded to the ownership of each of the
Properties or the interests therein based upon a value for such property
determined by the Company. The valuation of the Company as a whole was
determined based primarily upon a multiple of estimated funds from operations
and adjusted funds from operations attributable to all assets of the Company,
including the Company's interests in the Development and Management Company.
 
                           STRUCTURE OF THE COMPANY
 
  As a result of the Formation Transactions, the subsequent issuance of
891,369 shares of Common Stock and OP Units in connection with the acquisition
of Properties, and the issuance of shares of Common Stock in this Offering,
the structure and ownership of the Company is as illustrated in the chart set
forth below:
 

   [Chart depicting Boston Properties, Inc. and its principal subsidiaries]

 
                                      89
<PAGE>
 
                          BENEFITS TO RELATED PARTIES
 
  Certain affiliates of the Company realized certain material benefits in
connection with the Formation Transactions, including the following:
 
  .  In respect of their respective ownership interests in the Property
     Partnerships and the development and management business of the Company,
     Messrs. Zuckerman and Linde became beneficial owners of a total of
     15,972,611 shares of Common Stock and OP Units, with a total value of
     approximately $399.3 million based on the Initial Offering price of the
     Common Stock. Other persons who were officers of the Company at the
     completion of the Initial Offering received 1,186,298 OP Units, with a
     total value of approximately $29.7 million based on the Initial Offering
     price, for their interests in the Property Partnerships. In addition,
     guarantees by Messrs. Zuckerman and Linde with respect to principal
     repayment of approximately $92 million of indebtedness were released
     because such indebtedness was repaid at the completion of the Initial
     Offering. The book value of the interests and assets transferred to the
     Company by Messrs. Zuckerman and Linde and other officers of the Company
     was approximately negative $506.3 million.
 
  .  Approximately $749.9 million of indebtedness, of which $707.1 million
     was secured by the Properties, and $42.8 million was due to Messrs.
     Zuckerman and Linde for amounts loaned in connection with certain
     development properties and certain parcels of land, and the related
     additional and accrued interest thereon, assumed by the Operating
     Partnership was repaid in the Formation Transactions. A portion of this
     debt was previously guaranteed by Messrs. Zuckerman and Linde. Messrs.
     Zuckerman and Linde continued to guarantee certain indebtedness of the
     Company. See "Operating Partnership Agreement--Tax Protection
     Provisions."
 
  .  Messrs. Zuckerman and Linde and others who received OP Units in
     connection with the Formation Transactions were granted registration
     rights with respect to shares of Common Stock that were issued in
     exchange for OP Units.
 
  .  In connection with certain development projects or rights, Messrs.
     Zuckerman and Linde had direct or indirect personal liability, in
     certain instances, for the performance of contractual obligations by or
     for the benefit of the Operating Partnership. In connection with the
     Formation Transactions, they were relieved of such personal liability
     or, to the extent they were not so relieved, the Operating Partnership
     agreed to cause such contractual obligations to be performed and to
     indemnify Messrs. Zuckerman and Linde and their affiliates for all
     damages and expenses that may arise from any failure to do so.
 
  .  Messrs. Zuckerman and Linde owned approximately 7.1% of the outstanding
     Common Stock following the Initial Offering, served as directors and as
     officers with the titles Chairman of the Board and President and Chief
     Executive Officer, respectively, and the Company entered into an
     employment agreement with Mr. Linde.
 
  .  A "grandfather" provision in the Company's Shareholder Rights Agreement
     which assures that Messrs. Zuckerman and Linde and their affiliates
     would not, alone, be deemed to be a "group" that would trigger the
     exercisability of rights issued thereunder and that would enable them to
     continue to own, whether through ownership of Common Stock or OP Units,
     a percentage economic interest in the Company equal to their interest as
     of immediately after the completion of the Initial Offering.
 
 
                                      90
<PAGE>
 
                        OPERATING PARTNERSHIP AGREEMENT
 
  The following summary of the Operating Partnership Agreement describes the
material provisions of such agreement. This summary is qualified in its
entirety by reference to the Operating Partnership Agreement, which is filed
as an exhibit to the Registration Statement of which this Prospectus is a
part.
 
                                  MANAGEMENT
 
  The Operating Partnership was organized as a Delaware limited partnership on
April 8, 1997. The Company is the sole general partner of, and will hold after
the Offering approximately 75.7% of the economic interests in, the Operating
Partnership. The Company holds a one percent general partner interest in the
Operating Partnership and the balance is held as a limited partner interest.
The Company conducts substantially all of its business through the Operating
Partnership and its subsidiaries.
 
  Pursuant to the Operating Partnership Agreement, the Company, as the sole
general partner of the Operating Partnership, generally has full, exclusive
and complete responsibility and discretion in the management, operation and
control of the Operating Partnership, including the ability to cause the
Operating Partnership to enter into certain major transactions, including
acquisitions, developments and dispositions of properties and refinancings of
existing indebtedness. No limited partner may take part in the operation,
management or control of the business of the Operating Partnership by virtue
of being a holder of OP Units. Certain restrictions apply to the Company's
ability to engage in a Business Combination, as described more fully under
"Extraordinary Transactions" below.
 
  The limited partners of the Operating Partnership have agreed that in the
event of any conflict in the fiduciary duties owed by the Company to its
stockholders and by the Company, as general partner of the Operating
Partnership, to such limited partners, the Company may act in the best
interests of the Company's stockholders without violating its fiduciary duties
to such limited partners or being liable for any resulting breach of its
duties to the limited partners.
 
  The Operating Partnership Agreement provides that all business activities of
the Company, including all activities pertaining to the acquisition and
operation of properties, must be conducted through the Operating Partnership,
and that the Operating Partnership must be operated in a manner that will
enable the Company to satisfy the requirements for being classified as a REIT.
 
  REMOVAL OF THE GENERAL PARTNER; TRANSFER OF THE GENERAL PARTNER'S INTEREST
 
  The Operating Partnership provides that the limited partners may not remove
the Company as general partner of the Operating Partnership. The Company may
not transfer any of its interests as general or limited partner in the
Operating Partnership except (i) in connection with a merger or sale of all or
substantially all of its assets pursuant to a transaction for which it has
obtained the requisite approval in accordance with the terms of the Operating
Partnership Agreement (ii) if the limited partners holding at least three-
fourths of the OP Units (excluding OP Units owned by the Company) consent to
such transfer or (iii) to certain affiliates of the Company.
 
               AMENDMENTS OF THE OPERATING PARTNERSHIP AGREEMENT
 
  Amendments to the Operating Partnership Agreement may be proposed by the
Company or by limited partners owning at least 20% of the OP Units.
 
  Generally, the Operating Partnership Agreement may be amended with the
approval of the Company, as general partner, and limited partners (including
the Company) holding a majority of the OP Units. Certain amendments that
would, among other things, convert a limited partner's interest into a general
partner's interest, modify the limited liability of a limited partner, alter
the interest of a partner in profits or losses or the right to receive any
distributions, alter or modify the redemption right described above, or cause
the termination of the
 
                                      91
<PAGE>
 
Operating Partnership at a time or on terms inconsistent with those set forth
in the Operating Partnership Agreement must be approved by the Company and
each limited partner that would be adversely affected by such amendment.
Notwithstanding the foregoing, the Company, as general partner, has the power,
without the consent of the limited partners, to amend the Operating
Partnership Agreement as may be required to (1) add to the obligations of the
Company as general partner or surrender any right or power granted to the
Company as general partner; (2) reflect the admission, substitution,
termination or withdrawal of partners in accordance with the terms of the
Operating Partnership Agreement; (3) establish the rights, powers, duties and
preferences of any additional partnership interests issued in accordance with
the terms of the Operating Partnership Agreement; (4) reflect a change of an
inconsequential nature that does not materially adversely affect the limited
partners, or cure any ambiguity, correct or supplement any provisions of the
Operating Partnership Agreement not inconsistent with law or with other
provisions of the Operating Partnership Agreement, or make other changes
concerning matters under the Operating Partnership Agreement that are not
otherwise inconsistent with the Operating Partnership Agreement or law; or (5)
satisfy any requirements of federal or state law. Certain provisions affecting
the rights and duties of the Company as general partner (e.g., restrictions on
the Company's power to conduct businesses other than owning OP Units;
restrictions relating to the issuance of securities of the Company and related
capital contributions to the Operating Partnership; restrictions relating to
certain extraordinary transactions involving the Company or the Operating
Partnership) may not be amended without the approval of a majority or, in
certain instances, a supermajority of the OP Units not held by the Company.
 
               TRANSFER OF OP UNITS; SUBSTITUTE LIMITED PARTNERS
 
  The Operating Partnership Agreement provides that limited partners generally
may transfer their OP Units without the consent of any other person, but may
substitute a transferee as a limited partner only with the prior written
consent of the Company as the sole general partner of the Operating
Partnership. In addition, limited partners may not transfer OP Units in any
event until the one-year anniversary of the Initial Offering or in violation
of certain regulatory and other restrictions set forth in the Operating
Partnership Agreement. Notwithstanding the foregoing, Messrs. Zuckerman and
Linde and the other executive and senior officers of the Company have entered
into agreements pursuant to which they may not transfer or dispose of OP Units
or Common Stock without the consent of Goldman, Sachs & Co. and Merrill Lynch,
Pierce, Fenner & Smith Incorporated for a period of two years (one year in the
case of senior officers who are not executive officers) from June 1997.
 
                            REDEMPTION OF OP UNITS
 
  Beginning on August 23, 1998, the Operating Partnership will be obligated to
redeem each OP Unit at the request of the holder thereof for cash equal to the
fair market value of one share of Common Stock at the time of such redemption
(as determined in accordance with the provisions of the Operating Partnership
Agreement), provided that the Company may elect to acquire any such OP Unit
presented for redemption for one share of Common Stock or an amount of cash of
the same value. The Company presently anticipates that it will elect to issue
Common Stock in connection with each such redemption rather than having the
Operating Partnership pay cash. With each such redemption, the Company's
percentage ownership interest in the Operating Partnership will increase.
Persons other than the Company who acquired OP Units in the Formation
Transactions or in connection with acquisitions by the Company have certain
rights, pursuant to separate registration rights agreements, to have the
issuance of shares of Common Stock that may be issued to them in exchange for
their OP Units, or the resale of such shares by them, registered under the
Securities Act. See "Shares Available for Future Sale."
 
             ISSUANCE OF ADDITIONAL LIMITED PARTNERSHIP INTERESTS
 
  The Company is authorized, without the consent of the limited partners, to
cause the Operating Partnership to issue additional OP Units to the Company,
to the limited partners or to other persons for such consideration and on such
terms and conditions as the Company deems appropriate. If additional OP Units
are issued to the
 
                                      92
<PAGE>
 
Company, then the Company must (i) issue additional shares of Common Stock and
must contribute to the Operating Partnership the entire proceeds received by
the Company from such issuance or (ii) issue additional OP Units to all
partners in proportion to their respective interests in the Operating
Partnership. In addition, the Company may cause the Operating Partnership to
issue to the Company additional partnership interests in different series or
classes, which may be senior to the OP Units, in conjunction with an offering
of securities of the Company having substantially similar rights, in which the
proceeds thereof are contributed to the Operating Partnership. Consideration
for additional partnership interests may be cash or other property or assets.
No limited partner has preemptive, preferential or similar rights with respect
to additional capital contributions to the Operating Partnership or the
issuance or sale of any partnership interests therein.
 
                          EXTRAORDINARY TRANSACTIONS
 
  The Operating Partnership Agreement provides that the Company may not
generally engage in any merger, consolidation or other combination with or
into another person or sale of all or substantially all of its assets, or any
reclassification, or any recapitalization or change of outstanding shares of
Common Stock (a "Business Combination"), unless the holders of OP Units will
receive, or have the opportunity to receive, the same consideration per OP
Unit as holders of Common Stock receive per share of Common Stock in the
transaction; if holders of OP Units will not be treated in such manner in
connection with a proposed Business Combination, the Company may not engage in
such transaction unless limited partners (other than the Company) holding at
least 75% of the OP Units held by limited partners vote to approve the
Business Combination. In addition, the Company, as general partner of the
Operating Partnership, has agreed in the Operating Partnership Agreement with
the limited partners that the Company will not consummate a Business
Combination in which the Company conducted a vote of the stockholders unless
the matter would have been approved had holders of OP Units been able to vote
together with the stockholders on the transaction. The foregoing provision of
the Operating Partnership Agreement would under no circumstances enable or
require the Company to engage in a Business Combination which required the
approval of the Company's stockholders if the Company's stockholders did not
in fact give the requisite approval. Rather, if the Company's stockholders did
approve a Business Combination, the Company would not consummate the
transaction unless (i) the Company as general partner first conducts a vote of
holders of OP Units (including the Company) on the matter, (ii) the Company
votes the OP Units held by it in the same proportion as the stockholders of
the Company voted on the matter at the stockholder vote, and (iii) the result
of such vote of the OP Unit holders (including the proportionate vote of the
Company's OP Units) is that had such vote been a vote of stockholders, the
Business Combination would have been approved by the stockholders. As a result
of these provisions of the Operating Partnership, a third party may be
inhibited from making an acquisition proposal that it would otherwise make, or
the Company, despite having the requisite authority under its Certificate of
Incorporation, may not be authorized to engage in a proposed Business
Combination.
 
                           TAX PROTECTION PROVISIONS
 
  The Operating Partnership Agreement provides that, until June 23, 2007, the
Operating Partnership may not sell or otherwise transfer a Designated Property
in a taxable transaction without the prior written consent of Messrs.
Zuckerman and Linde. Similarly, the Company has agreed with the party that
contributed 875 Third Avenue to the Operating Partnership that the Company
will not sell or otherwise transfer that Property in a taxable transaction
until November 21, 2007 without the consent of that party. The Operating
Partnership is not required to obtain the aforementioned consent from the
party protected thereby if such party does not continue to hold during the
applicable period at least a specified percentage of his original OP Units.
Since the consent of the protected parties is required only in connection with
a taxable sale or other disposition of any Designated Property, the Operating
Partnership will not be required to obtain such consent in connection with a
"like-kind" exchange of any such property under Section 1031 of the Code or in
connection with a number of other nontaxable transactions, such as a
nontaxable reorganization or merger of the Operating Partnership or the
formation of a joint venture involving a Designated Property pursuant to
Section 721 of the Code.
 
  Messrs. Zuckerman and Linde recognized approximately $80 million in gain as
a result of the Formation Transactions. To avoid the recognition of additional
gain, Messrs. Zuckerman and Linde (together with certain
 
                                      93
<PAGE>
 
other Continuing Investors) agreed to guarantee certain indebtedness of the
Company in the amount of approximately $135 million, which is represented by
non-recourse liabilities on five of the Properties (2300 N Street, Ten
Cambridge Center, the Garage Property, 191 Spring Street and Hilltop Business
Center). Messrs. Zuckerman and Linde also agreed to guarantee up to
approximately $57.7 million of any recourse liabilities of the Operating
Partnership (which initially consisted of amounts outstanding under the
Unsecured Line of Credit) through a deficit restoration obligation set forth
in the Operating Partnership Agreement. In addition to these guarantees,
Messrs. Zuckerman and Linde also avoided the recognition of gain as a result
of the allocation of their share of the Operating Partnership's non-recourse
indebtedness in the amount of approximately $695.3 million (including the
approximately $134.5 million noted above).
 
  If the level of indebtedness of the Operating Partnership were to fall below
the total indebtedness following the Initial Offering (approximately $753
million), Messrs. Zuckerman and Linde would recognize taxable gain under
Section 731 of the Code. To reduce this risk to Messrs. Zuckerman and Linde
while providing the Company with sole control over its level of indebtedness,
the Operating Partnership agreed to undertake to use its reasonable commercial
efforts to cause its lenders to permit Messrs. Zuckerman and Linde to
guarantee additional and/or substitute indebtedness following the Initial
Offering. The Operating Partnership, however, is under no obligation to
Messrs. Zuckerman and Linde to maintain any specified debt or any specified
level of indebtedness or to make any payments to Messrs. Zuckerman or Linde if
a reduction in the indebtedness of the Operating Partnership were to result in
the recognition of gain by Messrs. Zuckerman or Linde. See "Risk Factors--
Conflicts of Interest."
 
            EXCULPATION AND INDEMNIFICATION OF THE GENERAL PARTNER
 
  The Operating Partnership Agreement generally provides that the Company, as
general partner of the Operating Partnership, will incur no liability to the
Operating Partnership or any limited partner for losses sustained or
liabilities incurred as a result of errors in judgment or of any act or
omission if the Company carried out its duties in good faith. In addition, the
Company is not responsible for any misconduct or negligence on the part of its
agents, provided the Company appointed such agents in good faith. The Company
may consult with legal counsel, accountants, appraisers, management
consultants, investment bankers and other consultants and advisors, and any
action it takes or omits to take in reliance upon the opinion of such persons,
as to matters that the Company reasonably believes to be within their
professional or expert competence, shall be conclusively presumed to have been
done or omitted in good faith and in accordance with such opinion.
 
  The Operating Partnership Agreement also provides for indemnification of the
Company, the directors and officers of the Company, and such other persons as
the Company may from time to time designate against any judgments, penalties,
fines, settlements and reasonable expenses actually incurred by such person in
connection with the preceding unless it is established that: (1) the act or
omission of the indemnified person was material to the matter giving rise to
the preceding and either was committed in bad faith or was the result of
active and deliberate dishonesty; (2) the indemnified person actually received
an improper personal benefit in money, property or services; or (3) in the
case of any criminal proceeding, the indemnified person had reasonable cause
to believe that the act or omission was unlawful.
 
                                  TAX MATTERS
 
  The Company is the tax matters partner of the Operating Partnership and, as
such, has the authority to make tax elections under the Code on behalf of the
Operating Partnership.
 
                                     TERM
 
  The Operating Partnership will continue in full force and effect until
December 31, 2095 or until sooner dissolved pursuant to the terms of the
Operating Partnership Agreement.
 
                                      94
<PAGE>
 
                            PRINCIPAL STOCKHOLDERS
 
  The following table sets forth certain information regarding the beneficial
ownership of Common Stock (including Common Stock that may be issued in
exchange for OP Units presented for redemption) by each director, by each
Named Executive Officer, by all directors and executive officers of the
Company as a group and by each person who is expected to be the beneficial
owner of 5% or more of the outstanding shares of Common Stock immediately
following the completion of the Offering. Except as indicated below, all of
such Common Stock is owned directly, and the indicated person has sole voting
and investment power.
 
<TABLE>
<CAPTION>
                                         NUMBER OF SHARES AND   PERCENTAGE  PERCENT
                                         OP UNITS BENEFICIALLY    OF ALL     OF ALL
                                              OWNED AFTER      COMMON STOCK  COMMON
 NAM OF BENEFICIAL OWNER(1)E                 THE OFFERING      AND OP UNITS STOCK(2)
- ---------------------------              --------------------- ------------ --------
    <S>                                  <C>                   <C>          <C>
    Mortimer B. Zuckerman (3)(5).......        8,957,894           12.9%      14.8%
    Edward H. Linde (4)(5).............        7,020,714           10.1       12.0
    Alan J. Patricof (6)...............            5,000            *          *
    Ivan G. Seidenberg (6).............              500            *          *
    Martin Turchin (7).................            5,000            *          *
    Robert E. Burke (8)................          286,048            *          *
    Raymond A. Ritchey (9).............          286,048            *          *
    David R. Barrett (10)..............          169,381            *          *
    Robert E. Selsam (11)..............            9,000            *          *
    All directors and executive
     officers as a group (10 persons)..       16,813,618           24.1%      25.1%
</TABLE>
- --------
*  Less than 1%.
 (1) Address: c/o Boston Properties, Inc., 8 Arlington Street, Boston,
     Massachusetts 02116.
 (2) Assumes that all the OP Units held by the person are presented to the
     Operating Partnership for redemption and acquired by the Company for
     shares of Common Stock. The total number of shares of Common Stock
     outstanding used in calculating the percentage assumes that none of the
     OP Units held by other persons are similarly acquired for Common Stock.
 (3) Includes 2,136,312 OP Units held by certain trusts that received OP Units
     in the Formation Transactions in exchange for interests in the
     Properties. Includes 1,291,770 shares of Common Stock.
 (4) Includes 2,135,854 OP Units held by certain trusts that received OP Units
     in the Formation Transactions in exchange for interests in the
     Properties. Includes 1,297,771 shares of Common Stock, 6,000 of which are
     held by a trust.
 (5) Excludes 21,600 of the OP Units owned by Square 36 Properties Limited
     Partnership ("Square 36"). Messrs. Zuckerman and Linde control the
     general partner of Square 36 but do not have an economic interest in such
     OP Units and cannot dispose of such OP Units without the consent of an
     unaffiliated limited partner of Square 36.
 (6) Shares of Common Stock.
 (7) Shares of Common Stock, of which 3,000 shares are held by a family trust.
 (8) Includes 37,926 OP Units held by a limited liability company.
 (9) Includes 35,600 OP Units held by a limited liability company.
(10) Includes 23,600 OP Units held by a limited liability company.
(11) Includes 1,000 shares of Common Stock.
 
                                      95
<PAGE>
 
                         DESCRIPTION OF CAPITAL STOCK
 
  The description of the Company's capital stock set forth below does not
purport to be complete and is qualified in its entirety by reference to the
Company's Certificate and Bylaws, copies of which are exhibits to the
Registration Statement of which this Prospectus is a part.
 
                                    GENERAL
 
  The Company adopted its Amended and Restated Certificate of Incorporation
(the "Certificate") on June 23, 1997. Under the Certificate, the Company has
authority to issue up to 450 million shares of stock, consisting of 250
million shares of Common Stock, par value $0.01 per share, 150 million shares
of excess stock, par value $0.01 per share ("Excess Stock") (as described
below), and 50 million shares of Preferred Stock, par value $0.01 per share.
Under Delaware law, stockholders generally are not responsible for the
corporation's debts or obligations. Upon completion of the Offering,
52,694,041 shares of Common Stock will be issued and outstanding and no shares
of Excess Stock or Preferred Stock will be issued and outstanding.
 
  With respect to the Preferred Stock, the Certificate authorizes the
Directors to set or change the preferences, conversion or other rights, voting
powers, restrictions, limitations as to distributions, qualifications or terms
or conditions of redemption of such stock.
 
                                 COMMON STOCK
 
  All shares of Common Stock offered hereby have been duly authorized, and are
fully paid and nonassessable. Subject to the preferential rights of any other
shares or series of shares and to the provisions of the Company's Certificate
regarding Excess Stock, holders of Common Stock are entitled to receive
dividends on Common Stock if, as and when authorized and declared by the Board
of Directors of the Company out of assets legally available therefor and to
share ratably in the assets of the Company legally available for distribution
to its stockholders in the event of its liquidation, dissolution or winding-up
after payment of, or adequate provision for, all known debts and liabilities
of the Company.
 
  Subject to the provisions of the Company's Certificate regarding Excess
Stock, each outstanding share of Common Stock entitles the holder to one vote
on all matters submitted to a vote of stockholders, including the election of
directors, and, except as otherwise required by law or except as provided with
respect to any other class or series of shares, the holders of Common Stock
possess exclusive voting power. There is no cumulative voting in the election
of directors, which means that the holders of a majority of the outstanding
shares of Common Stock can elect all of the directors then standing for
election, and the holders of the remaining shares of Common Stock will not be
able to elect any director.
 
  Holders of Common Stock have no conversion, sinking fund or redemption
rights, or preemptive rights to subscribe for any securities of the Company.
 
  The Company intends to furnish its stockholders with annual reports
containing audited consolidated financial statements and an opinion thereon
expressed by an independent public accounting firm and quarterly reports for
the first three quarters of each fiscal year containing unaudited financial
information.
 
  Subject to the provisions of the Company's Certificate regarding Excess
Stock, all Common Stock has equal dividend, distribution, liquidation and
other rights, and has no preference, appraisal (except as provided by Delaware
law) or exchange rights.
 
                                PREFERRED STOCK
 
  Preferred Stock may be issued from time to time, in one or more series, as
authorized by the Board of Directors. Prior to the issuance of shares of each
series, the Board of Directors is required by the DGCL and the Company's
Certificate to fix for each series, subject to the provisions of the Company's
Certificate regarding
 
                                      96
<PAGE>
 
Excess Stock, such terms, preferences, conversion or other rights, voting
powers, restrictions, limitations as to dividends or other distributions,
qualifications and terms or conditions of redemption, as are permitted by
Delaware law. Such rights, powers, restrictions and limitations could include
the right to receive specified dividend payments and payments on liquidation
prior to any such payments being made to the holders of some, or a majority,
of the Common Stock. The Board of Directors could authorize the issuance of
Preferred Stock with terms and conditions that could have the effect of
discouraging a takeover or any other transaction that holders of Common Stock
might believe to be in their best interests or in which holders of some, or a
majority, of the Common Stock might receive a premium for their shares over
the then current market price of such shares. As of the date hereof, no shares
of Preferred Stock are outstanding, and the Company has no present plans to
issue any Preferred Stock. The Company has authorized the issuance of a series
of preferred stock in connection with the Company's shareholder rights plan.
See "--Shareholder Rights Agreement"; "Certain Provisions of Delaware Law and
of the Company's Certificate and Bylaws."
 
                           RESTRICTIONS ON TRANSFERS
 
  In order for the Company to qualify as a REIT under the Code, among other
things, not more than 50% in value of its outstanding capital stock may be
owned, directly or indirectly, by five or fewer individuals (defined in the
Code to include certain entities) during the last half of a taxable year
(other than the first year) (the "Five or Fewer Requirement"), and such shares
of capital stock must be beneficially owned by 100 or more persons during at
least 335 days of a taxable year of 12 months (other than the first year) or
during a proportionate part of a shorter taxable year. See "Federal Income Tax
Consequences." In order to protect the Company against the risk of losing its
status as a REIT and to otherwise protect the Company from the consequences of
a concentration of ownership among its stockholders, the Certificate, subject
to certain exceptions, provides that no single person (which includes any
"group" of persons) (other than the "Related Parties," as defined below and
certain "Look-Through Entities," as defined below), may "beneficially own"
more than 6.6% (the "Ownership Limit") of the aggregate number of outstanding
shares of any class or series of capital stock. Under the Certificate, a
person generally "beneficially owns" shares if (i) such person has direct
ownership of such shares, (ii) such person has indirect ownership of such
shares taking into account the constructive ownership rules of Section 544 of
the Code, as modified by Section 856(h)(1)(B) of the Code, or (iii) such
person would be deemed to "beneficially own" such shares pursuant to Rule 13d-
3 under the Exchange Act. A Related Party, however, will not be deemed to
beneficially own shares by virtue of clause (iii) of the preceding sentence
and a "group" of which a Related Party is a member will generally not have
attributed to the group's beneficial ownership any shares beneficially owned
by such Related Party. Each of Mr. Zuckerman and his respective heirs,
legatees and devisees, and any other person whose beneficial ownership of
shares of Common Stock would be attributed under the Code to Mr. Zuckerman, is
a "Related Party", and such persons are subject to a "Related Party Ownership
Limit" of 15%, such that none of such persons shall be deemed to beneficially
own shares in excess of the Ownership Limit unless, in the aggregate, such
persons own shares of any class or series of capital stock in excess of 15% of
the number of shares of such class or series outstanding. A similar Related
Party Ownership Limit is applied to Mr. Linde and persons with a similar
relationship to Mr. Linde, all of whom are also Related Parties under the
Certificate. The Company's Certificate provides that pension plans described
in Section 401(a) of the Code and mutual funds registered under the Investment
Company Act of 1940 ("Look-Through Entities") are subject to a 15% "Look-
Through Ownership Limit." Pension plans and mutual funds are among the
entities that are not treated as holders of stock under the Five or Fewer
Requirement and the beneficial owners of such entities will be counted as
holders for this purpose. Any transfer of shares of capital stock or of any
security convertible into shares of capital stock that would create a direct
or indirect ownership of shares of capital stock in excess of the Ownership
Limit, the Look-Through Ownership Limit or the Related Party Ownership Limit,
as applicable, or that would result in the disqualification of the Company as
a REIT, including any transfer that results in the shares of capital stock
being owned by fewer than 100 persons or results in the Company being "closely
held" within the meaning of Section 856(h) of the Code or results in the
Company constructively owning 10% or more of the ownership interests in a
tenant of the Company within the meaning of Section 318 of the Code as
modified by Section 856(d)(5) of the Code, shall be null and void, and the
intended transferee will acquire no rights to the shares of capital stock. The
foregoing restrictions on transferability and ownership will not apply if the
Board of Directors determines that it is no
 
                                      97
<PAGE>
 
longer in the best interests of the Company to attempt to qualify, or to
continue to qualify, as a REIT. The Board of Directors may, in its sole
discretion, waive the Ownership Limit, the Look-Through Ownership Limit and
the Related Party Ownership Limit if evidence satisfactory to the Board of
Directors is presented that the changes in ownership will not jeopardize the
Company's REIT status and the Board of Directors otherwise decides that such
action is in the best interest of the Company.
 
  If any purported transfer of capital stock of the Company or any other event
would otherwise result in any person violating the Ownership Limit, the Look-
Through Ownership Limit or the Related Party Limit, as applicable, or the
Certificate, then any such purported transfer will be void and of no force or
effect with respect to the purported transferee (the "Prohibited Transferee")
as to that number of shares in excess of the applicable Limit and the
Prohibited Transferee shall acquire no right or interest (or, in the case of
any event other than a purported transfer, the person or entity holding record
title to any such shares in excess of the applicable Limit (the "Prohibited
Owner") shall cease to own any right or interest) in such excess shares. Any
such excess shares described above will be converted automatically into an
equal number of shares of Excess Stock (the "Excess Shares") and transferred
automatically, by operation of law, to a trust, the beneficiary of which will
be a qualified charitable organization selected by the Company (the
"Beneficiary"). Such automatic transfer shall be deemed to be effective as of
the close of business on the Trading Day (as defined in the Certificate) prior
to the date of such violative transfer. As soon as practical after the
transfer of shares to the trust, the trustee of the trust (who shall be
designated by the Company and be unaffiliated with the Company and any
Prohibited Transferee or Prohibited Owner) will be required to sell such
Excess Shares to a person or entity who could own such shares without
violating the applicable Limit, and distribute to the Prohibited Transferee an
amount equal to the lesser of the price paid by the Prohibited Transferee for
such Excess Shares or the sales proceeds received by the trust for such Excess
Shares. In the case of any Excess Shares resulting from any event other than a
transfer, or from a transfer for no consideration (such as a gift), the
trustee will be required to sell such Excess Shares to a qualified person or
entity and distribute to the Prohibited Owner an amount equal to the lesser of
the fair market value of such Excess Shares as of the date of such event or
the sales proceeds received by the trust for such Excess Shares. In either
case, any proceeds in excess of the amount distributable to the Prohibited
Transferee or Prohibited Owner, as applicable, will be distributed to the
Beneficiary. Prior to a sale of any such Excess Shares by the trust, the
trustee will be entitled to receive in trust for the Beneficiary, all
dividends and other distributions paid by the Company with respect to such
Excess Shares.
 
  In addition, shares of stock of the Company held in the trust shall be
deemed to have been offered for sale to the Company, 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 trust (or, in the case of a
devise or gift, the market price at the time of such devise or gift) and (ii)
the market price on the date the Company, or its designee, accepts such offer.
The Company shall have the right to accept such offer for a period of 90 days.
Upon such a sale to the company, the interest of the Beneficiary in the shares
sold shall terminate and the trustee shall distribute the net proceeds of the
sale to the Prohibited Owner.
 
  These restrictions do not preclude settlement of transactions through the
NYSE.
 
  Each stockholder shall upon demand be required to disclose to the Company in
writing any information with respect to the direct, indirect and constructive
ownership of capital stock as the Board of Directors 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.
 
  The Ownership Limit may have the effect of precluding acquisition of control
of the Company.
 
                         SHAREHOLDER RIGHTS AGREEMENT
 
  The Board of Directors of the Company has adopted a Shareholder Rights
Agreement (the "Rights Agreement"). The adoption of the Rights Agreement could
make it more difficult for a third party to acquire, or could discourage a
third party from acquiring, the Company or a large block of the Company's
Common Stock.
 
 
                                      98
<PAGE>
 
  Pursuant to the terms of the Rights Agreement, the Board of Directors
declared a dividend distribution of one Preferred Stock Purchase Right (a
"Right") for each outstanding share of Common Stock to stockholders of record
as of a day prior to effectiveness of the Registration Statement with respect
to the Initial Offering (the "Record Date"). In addition, one Right will
automatically attach to each share of Common Stock issued between the Record
Date and the Distribution Date (as hereinafter defined). Each Right entitles
the registered holder to purchase from the Company a unit consisting of one
one-thousandth of a share (a "Unit") of Series E Junior Participating
Cumulative Preferred Stock, par value $.01 per share (the "Series E Preferred
Stock") at a cash exercise price of $100 per Unit (the "Exercise Price"),
subject to adjustment. Each Share offered hereby will be entitled to a Right
when distributed.
 
  Initially, the Rights are not exercisable and are attached to and trade with
the outstanding shares of Common Stock. The Rights will separate from the
Common Stock and will become exercisable upon the earliest of (i) the close of
business on the tenth calendar day following the first public announcement
that a person or group of affiliated or associated persons (an "Acquiring
Person") has acquired beneficial ownership of more than 15% of the sum of the
outstanding shares of Common Stock and Excess Stock ("Common Shares") (the
date of said announcement being referred to as the "Stock Acquisition Date"),
or (ii) the close of business on the tenth business day (or such other
calendar day as the Board of Directors may determine) following the
commencement of a tender offer or exchange offer that would result upon its
consummation in a person or group becoming the beneficial owner of more than
15% of the outstanding Common Shares (the earlier of such dates being herein
referred to as the "Distribution Date"). For these purposes, a person will not
be deemed to beneficially own shares of Common Stock which may be issued in
exchange for OP Units. In addition, no person who is a partner of the
Operating Partnership as of the closing of the Offering will be an Acquiring
Person unless such person acquires beneficial ownership of (i) more than 15%
of the outstanding Common Shares and (ii) a greater percentage of the then
outstanding Common Shares and OP Units (excluding OP Units held by the
Company) than that percentage of the total number of shares of Common Stock
and OP Units (excluding OP Units held by the Company) that such partner held
at the conclusion of the Initial Offering. Furthermore, no "group" of which a
Related Party is a member will be deemed to beneficially own the Common Shares
beneficially owned by such Related Party.
 
  Until the Distribution Date (or earlier redemption, exchange or expiration
of the Rights), (a) the Rights will be evidenced by the Common Stock
certificates and will be transferred with and only with such Common Stock
certificates, (b) new Common Stock certificates issued after the Record Date
will contain a notation incorporating the Shareholder Rights Agreement by
reference, and (c) the surrender for transfer of any certificates for Common
Stock will also constitute the transfer of the Rights associated with the
Common Stock represented by such certificate.
 
  The Rights are not exercisable until the Distribution Date and will expire
in 2007, unless previously redeemed or exchanged by the Company as described
below.
 
  As soon as practicable after the Distribution Date, Rights Certificates will
be mailed to holders of record of Common Stock as of the close of business on
the Distribution Date and, thereafter, the separate Rights Certificates alone
will represent the Rights. Except as otherwise determined by the Board of
Directors, only shares of Common Stock issued prior to the Distribution Date
will be issued with Rights.
 
  In the event that a Stock Acquisition Date occurs, proper provision will be
made so that each holder of a Right (other than an Acquiring Person or its
associates or affiliates, whose Rights shall become null and void) will
thereafter have the right to receive upon exercise that number of Units of
Series E Preferred Stock of the Company having a market value of two times the
exercise price of the Right (such right being referred to as the "Subscription
Right"). In the event that, at any time following the Stock Acquisition Date,
(i) the Company consolidates with, or merges with and into, any other person,
and the Company is not the continuing or surviving corporation, (ii) any
person consolidates with the Company, or merges with and into the Company and
the Company is the continuing or surviving corporation of such merger and, in
connection with such merger, all or part of the shares of Common Stock are
changed into or exchanged for stock or other securities of any other person or
cash or any other property, or (iii) 50% or more of the Company's assets or
earning power is sold, mortgaged or otherwise transferred, each holder of a
Right shall thereafter have the right to receive, upon
 
                                      99
<PAGE>
 
exercise, common stock of the acquiring company having a market value equal to
two times the exercise price of the Right (such right being referred to as the
"Merger Right"). The holder of a Right will continue to have the Merger Right
whether or not such holder has exercised the Subscription Right. Rights that
are or were beneficially owned by an Acquiring Person may under certain
circumstances specified in the Rights Agreement become null and void.
 
  At any time after the Stock Acquisition Date, the Board of Directors may, at
its option, exchange all or any part of the then outstanding and exercisable
Rights for shares of Common Stock or Units of Series E Preferred Stock at an
exchange ratio of one share of Common Stock or one Unit of Series E Preferred
Stock per Right. Notwithstanding the foregoing, the Board of Directors
generally will not be empowered to effect such exchange at any time after any
person becomes the beneficial owner of 50% or more of the Common Stock of the
Company.
 
  The Exercise Price payable, and the number of Units of Series E Preferred
Stock or other securities or property issuable, upon exercise of the Rights
are subject to adjustment from time to time to prevent dilution (i) in the
event of a stock dividend on, or a subdivision, combination or
reclassification of, the Series E Preferred Stock, (ii) if holders of the
Series E Preferred Stock are granted certain rights or warrants to subscribe
for Series E Preferred Stock or convertible securities at less than the
current market price of the Series E Preferred Stock, or (iii) upon the
distribution to holders of the Series E Preferred Stock of evidences of
indebtedness or assets (excluding regular quarterly cash dividends) or of
subscription rights or warrants (other than those referred to above).
 
  With certain exceptions, no adjustment in the Exercise Price will be
required until cumulative adjustments amount to at least 1% of the Exercise
Price, determined on a per Right basis. The Company is not obligated to issue
fractional Units. If the Company elects not to issue fractional Units, in lieu
thereof an adjustment in cash will be made based on the fair market value of
the Series E Preferred Stock on the last trading date prior to the date of
exercise. Any of the provisions of the Rights Agreement may be amended by the
Board of Directors at any time prior to the Distribution Date.
 
  The Rights may be redeemed in whole, but not in part, at a price of $0.001
per Right (payable in cash, Common Stock or other consideration deemed
appropriate by the Board of Directors) by the Board of Directors only until
the earlier of (i) the close of business on the tenth calendar day after the
Stock Acquisition Date, or (ii) the expiration date of the Rights Agreement.
Immediately upon the action of the Board of Directors ordering redemption of
the Rights, the Rights will terminate and thereafter the only right of the
holders of Rights will be to receive the redemption price.
 
  The Rights Agreement may be amended by the Board of Directors in its sole
discretion until the Distribution Date. After the Distribution Date, the Board
of Directors may, subject to certain limitations set forth in the Rights
Agreement, amend the Rights Agreement only to cure any ambiguity, defect or
inconsistency, to shorten or lengthen any time period, or to make changes that
do not adversely affect the interests of Rights holders (excluding the
interests of an Acquiring Person or its associates or affiliates).
 
  Until a Right is exercised, the holder will have no rights as a stockholder
of the Company (beyond those as an existing stockholder), including the right
to vote or to receive dividends. While the distribution of the Rights will not
be taxable to stockholders or to the Company, stockholders may, depending upon
the circumstances, recognize taxable income in the event that the Rights
become exercisable for Units, other securities of the Company, other
consideration or for common stock of an acquiring company.
 
  A copy of the Rights Agreement has been filed with the SEC and is
incorporated as an exhibit hereto by reference to the Registration Statement
with respect to the Initial Offering. A copy of the Rights Agreement is also
available from the Company upon written request. The foregoing description of
the Rights does not purport to be complete and is qualified in its entirety by
reference to the Rights Agreement, which is incorporated herein by reference.
 
                                      100
<PAGE>
 
                    CERTAIN PROVISIONS OF DELAWARE LAW AND
                     THE COMPANY'S CERTIFICATE AND BYLAWS
 
  The following summary of certain provisions of Delaware law and the
Company's Certificate and Bylaws does not purport to be complete and is
subject to and qualified in its entirety by reference to Delaware law and the
Company's Certificate and Bylaws, copies of which have been filed with the SEC
and are incorporated as exhibits hereto by reference to the Registration
Statement with respect to the Initial Offering.
 
  The Certificate and the Bylaws of the Company contain certain provisions
that could make more difficult the acquisition of the Company 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 the
Company to negotiate first with the Board of Directors. The Company 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. The description set
forth below is intended as a summary only and is qualified in its entirety by
reference to the Certificate and the Bylaws, which have been filed with the
SEC and are incorporated as exhibits hereto by reference to the Registration
Statement with respect to the Initial Offering. See also "Description of
Capital Stock--Restrictions on Transfers."
 
                      AMENDMENT OF CERTIFICATE AND BYLAWS
 
  The Company's Certificate may be amended only by the affirmative vote of the
holders of two-thirds (or, if more than 75% of the directors then in office
approve the amendment, a majority) of all of the votes entitled to be cast on
the matter except that amendments dealing with certain articles of the
Certificate (for example, articles relating to stockholder action; the powers,
election of, removal of and classification of directors; limitation of
liability; and amendment of the By-laws or the Certificate) shall require the
affirmative vote of not less than seventy-five percent of the outstanding
votes entitled to be cast on the matter. Unless otherwise required by law, the
Board of Directors may amend the Company's Bylaws by the affirmative vote of a
majority of the directors then in office. The Bylaws may also be amended by
the stockholders, at an annual meeting or at a special meeting called for such
purpose, by the affirmative vote of at least seventy-five percent of the votes
entitled to be cast on the matter; provided, that if the Board of Directors
recommends that stockholders approve such amendment at such meeting, such
amendment shall require the affirmative vote of only a majority of the shares
present at such meeting and entitled to vote.
 
                          DISSOLUTION OF THE COMPANY
 
  The DGCL permits the dissolution of the Company by (i) the affirmative vote
of a majority of the entire Board of Directors declaring such dissolution to
be advisable and directing that the proposed dissolution be submitted for
consideration at an annual or special meeting of stockholders, and (ii) upon
proper notice, stockholder approval by the affirmative vote of a majority of
the votes entitled to be cast on the matter.
 
                           MEETINGS OF STOCKHOLDERS
 
  Under the Company's Bylaws, annual meetings of stockholders shall be held at
such date and time as determined by the Board of Directors, the Chairman of
the Board or the President. The Bylaws establish an advance notice procedure
for stockholders to make nominations of candidates for directors or bring
other business before an annual meeting of stockholders. Special meetings of
stockholders may be called only by a majority of the Directors then in office
and only matters set forth in the notice of the meeting may be considered and
acted upon at such a meeting.
 
                            THE BOARD OF DIRECTORS
 
  The Company's Certificate provides that the Board of Directors shall
initially consist of five Directors and thereafter the number of Directors of
the Company may be established by the Board of Directors but may not be
 
                                      101
<PAGE>
 
fewer than the minimum number required by the DGCL nor more than eleven.
Subject to the rights, if any, of the holders of any series of Preferred Stock
to elect Directors and to fill vacancies in the Board of Directors relating
thereto, any vacancy will be filled, including any vacancy created by an
increase in the number of Directors, at any regular meeting or at any special
meeting called for the purpose, by a majority of the remaining Directors.
Pursuant to the terms of the Certificate, the Directors are divided into three
classes. One class will hold office initially for a term expiring at the
annual meeting of stockholders to be held in 1998, another class will hold
office initially for a term expiring at the annual meeting of stockholders to
be held in 1999 and the third class will hold office initially for a term
expiring in 2000. As the term of each class expires, Directors in that class
will be elected for a term of three years and until their successors are duly
elected and qualified. The use of a classified board may render more difficult
a change in control of the Company or removal of incumbent management. The
Company believes, however, that classification of the Board of Directors will
help to assure the continuity and stability of its business strategies and
policies.
 
  The Certificate provides that the affirmative vote of more than 75% of the
Directors then in office is required to approve certain transactions or
actions of the Board, including a change of control (as defined) of the
Company or of the Operating Partnership, any amendment to the Operating
Partnership Agreement, any waiver of the limitations on ownership contained in
the Certificate, certain issuances of equity securities by the Company or
termination of the Company's status as a REIT.
 
               SHAREHOLDER RIGHTS PLAN AND OWNERSHIP LIMITATIONS
 
  The Company has adopted a Shareholder Rights Plan. In addition, the
Certificate contains provisions that limit the ownership by any person of
shares of any class or series of capital stock of the Company. See
"Description of Capital Stock--Shareholder Rights Agreement."
 
                  LIMITATION OF LIABILITY AND INDEMNIFICATION
 
  The Company's Certificate generally limits the liability of the Company's
Directors to the Company to the fullest extent permitted from time to time by
Delaware law. The DGCL permits, but does not require, a corporation to
indemnify its directors, officers, employees or agents and expressly provides
that the indemnification provided for under the DGCL shall not be deemed
exclusive of any indemnification right under any bylaw, vote of stockholders
or disinterested directors, or otherwise. The DGCL permits indemnification
against expenses and certain other liabilities arising out of legal actions
brought or threatened against such persons for their conduct on behalf of a
corporation, provided that each such person acted in good faith and in a
manner that he reasonably believed was in or not opposed to such corporation's
best interests and in the case of a criminal proceeding, had no reasonable
cause to believe his or her conduct was unlawful. The DGCL does not allow
indemnification of directors in the case of an action by or in the right of a
corporation (including stockholder derivative suits) unless the directors
successfully defend the action or indemnification is ordered by the court.
 
  The Bylaws provide that Directors and officers of the Company shall be, and,
in the discretion of the Board of Directors, non-officer employees may be,
indemnified by the Company to the fullest extent authorized by Delaware law,
as it now exists or may in the future be amended, against all expenses and
liabilities actually and reasonably incurred in connection with service for or
on behalf of the Company. The Bylaws also provide that the right of directors
and officers to indemnification shall be a contract right and shall not be
exclusive of any other right now possessed or hereafter acquired under any
bylaw, agreement, vote of stockholders, or otherwise. The Certificate contains
a provision permitted by Delaware law that generally eliminates the personal
liability of directors for monetary damages for breaches of their fiduciary
duty, including breaches involving negligence or gross negligence in business
combinations, unless the director has breached his or her duty of loyalty,
failed to act in good faith, engaged in intentional misconduct or a knowing
violation of law, paid a dividend or approved a stock repurchase in violation
of the DGCL or obtained an improper personal benefit. The provision does not
alter a director's liability under the federal securities laws. In addition,
this provision does not affect the availability of equitable remedies, such as
an injunction or rescission, for breach of fiduciary duty.
 
 
                                      102
<PAGE>
 
  Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers or persons controlling the Company
pursuant to the foregoing provisions, the Company has been informed that in
the opinion of the SEC such indemnification is against public policy as
expressed in the Securities Act and is therefore unenforceable.
 
                             BUSINESS COMBINATIONS
 
  The Company is subject to the provisions of section 203 ("Section 203") of
the DGCL. Section 203 provides, with certain exceptions, that a Delaware
corporation may not engage in any of a broad range of business combinations
with a person or affiliate, or associate of such person, who is an "interested
stockholder" for a period of three years from the date that such person became
an interested stockholder unless: (i) the transaction resulting in a person
becoming an interested stockholder, or the business combination, was approved
by the board of directors of the corporation before the consummation of such
transaction; (ii) the interested stockholder owned 85% or more of the
outstanding voting stock of the corporation immediately after the transaction
in which it became an interested stockholder (excluding shares owned by
persons who are both officers and directors of the corporation, and shares
held by certain employee stock ownership plans); or (iii) on or after the date
the person becomes an interested stockholder, the business combination is
approved by the corporation's board of directors and by the holders of at
least 66 2/3% of the corporation's outstanding voting stock at an annual or
special meeting, excluding shares owned by the interested stockholder. Under
Section 203, an "interested stockholder" is defined (with certain exceptions)
as any person who, together with affiliates and associates, owns or within the
prior three years did own, 15% or more of the corporation's outstanding voting
stock.
 
                          INDEMNIFICATION AGREEMENTS
 
  The Company has entered into indemnification agreements with each of its
directors and executive officers. The indemnification agreements require,
among other things, that the Company indemnify its directors and executive
officers to the fullest extent permitted by law and advance to the directors
and executive officers all related expenses, subject to reimbursement if it is
subsequently determined that indemnification is not permitted. Under these
agreements, the Company must also indemnify and advance all expenses incurred
by directors and executive officers seeking to enforce their rights under the
indemnification agreements and may cover directors and executive officers
under the Company's directors' and officers' liability insurance. Although the
form of indemnification agreement offers substantially the same scope of
coverage afforded by law, it provides greater assurance to directors and
executive officers that indemnification will be available, because, as a
contract, it cannot be modified unilaterally in the future by the Board of
Directors or the stockholders to eliminate the rights it provides.
 
                                      103
<PAGE>
 
                       SHARES AVAILABLE FOR FUTURE SALE
 
                                    GENERAL
 
  Upon the completion of the Offering, the Company will have outstanding
52,694,041 shares of Common Stock. In addition, 16,957,328 shares of Common
Stock are reserved for issuance upon exchange of OP Units. All outstanding
shares of Common Stock will be freely tradeable by persons other than
"affiliates" of the Company without restriction under the Securities Act,
subject to the limitations on ownership set forth in the Company's Certificate
and Bylaws. See "Description of Capital Stock--Restrictions on Transfers." The
shares of Common Stock acquired in redemption of OP Units (the "Restricted
Shares") will be "restricted" securities under the meaning of Rule 144
promulgated under the Securities Act ("Rule 144") and may not be sold in the
absence of registration under the Securities Act unless an exemption from
registration is available, including exemptions contained in Rule 144. As
described below under "--Registration Rights," the Company has granted certain
holders registration rights with respect to their shares of Common Stock.
 
  In general, under Rule 144, if one year has elapsed since the later of the
date of acquisition of Restricted Shares from the Company or any "affiliate"
of the Company, as that term is defined under the Securities Act, the acquiror
or subsequent holder thereof is entitled to sell within any three-month period
a number of shares that does not exceed the greater of 1% of the then
outstanding shares of Common Stock or the average weekly trading volume of the
Common Stock during the four calendar weeks preceding the date on which notice
of the sale is filed with the SEC. Sales under Rule 144 are also subject to
certain manner of sales provisions, notice requirements and the availability
of current public information about the Company. If two years have elapsed
since the date of acquisition of Restricted Shares from the Company or from
any "affiliate" of the Company, and the acquiror or subsequent holder thereof
is deemed not to have been an affiliate of the Company at any time during the
90 days preceding a sale, such person is entitled to sell such shares in the
public market under Rule 144(k) without regard to the volume limitations,
manner of sale provisions, public information requirements or notice
requirements. Affiliates of the Company (such as Messrs. Zuckerman and Linde
who in the aggregate beneficially own 2,589,542 shares of Common Stock) remain
subject to such limitations without regard to the lapse of time.
 
  The Company has established the Stock Option Plan for the purpose of
attracting and retaining directors, executive officers and other key
employees. See "Management--Stock Option Plan" and "Management--Compensation
of Directors." Following the completion of this Offering the Company will have
reserved for issuance under the Plan 6,618,880 shares of Common Stock,
including 2,297,600 shares issuable upon exercise of outstanding options.
Prior to June 23, 1998, the Company expects to file a registration statement
on Form S-8 with the SEC with respect to the shares of Common Stock issuable
under the Stock Option Plan, which shares may then be resold without
restriction, unless held by affiliates.
 
  The Common Stock is traded on the NYSE. No prediction can be made as to the
effect, if any, that future sales of shares, or the availability of shares for
future sale, will have on the market price prevailing from time to time. Sales
of substantial amounts of Common Stock (including shares issued upon the
exercise of Options), or the perception that such sales occur, could adversely
affect prevailing market prices of the Common Stock. See "Risk Factors--Market
for the Common Stock."
 
                              REGISTRATION RIGHTS
 
  The Company has granted those persons who have received OP Units certain
registration rights with respect to the shares of Common Stock that may be
acquired by them in connection with the exercise of the Redemption/Exchange
Rights under the Operating Partnership Agreement. These registration rights
require the Company to register all such shares of Common Stock effective as
of August 23, 1997. The Company will bear expenses incident to its
registration requirements under the registration rights, except that such
expenses shall not include any underwriting discounts or commissions or
transfer taxes, if any, relating to such shares.
 
                                      104
<PAGE>
 
                        FEDERAL INCOME TAX CONSEQUENCES
 
  The following is a summary of the material federal income tax consequences
associated with an investment in the Common Stock. Goodwin, Procter & Hoar
llp, which acted as tax counsel to the Company in connection with the
formation of the Company and the Company's election to be taxed as a REIT, has
reviewed the following discussion and is of the opinion that it is an accurate
description of the federal income tax considerations that are likely to be
material to a holder of Common Stock. The following discussion is not
exhaustive of all possible tax considerations and is not tax advice. Moreover,
this summary does not deal with all tax aspects that might be relevant to a
particular prospective stockholder in light of his/her personal circumstances;
nor does it deal with particular types of stockholders that are subject to
special treatment under the Code, such as insurance companies, financial
institutions and broker-dealers. The Code provisions governing the Federal
income tax treatment of REITs are highly technical and complex, and this
summary is qualified in its entirety by the applicable Code provisions, rules
and regulations promulgated thereunder, and administrative and judicial
interpretations thereof. The following discussion and the opinions of Goodwin,
Procter & Hoar llp are based on current law. Unless the context requires
otherwise, references to the "Company" in this "Federal Income Tax
Consequences" section refer only to Boston Properties, Inc.
 
  EACH PROSPECTIVE PURCHASER IS ADVISED TO CONSULT HIS OR HER OWN TAX ADVISER
REGARDING THE SPECIFIC TAX CONSEQUENCES TO HIM OR HER OF THE PURCHASE,
OWNERSHIP AND SALE OF THE COMMON STOCK AND OF THE COMPANY'S ELECTION TO BE
TAXED AS A REIT, INCLUDING THE FEDERAL, STATE, LOCAL, FOREIGN AND OTHER TAX
CONSEQUENCES OF SUCH PURCHASE, OWNERSHIP AND SALE.
 
                    FEDERAL INCOME TAXATION OF THE COMPANY
 
  Upon consultation with its advisers, the Company believes that it is in a
position to qualify for treatment as a REIT for the year ending December 31,
1997, and intends to operate so as to meet the requirements under the Code for
qualification as a REIT, commencing with its taxable year ended December 31,
1997 and thereafter. The Company also believes, after consultation with its
advisers, that it has been organized, has operated and will operate in such a
manner as to qualify for taxation as a REIT under the Code. No assurance can
be given, however, that such requirements have been or will be met.
 
                            OPINION OF TAX COUNSEL
 
  Goodwin, Procter & Hoar llp has acted as counsel to the Company in
connection with the formation of the Company, the Initial Offering, the
Company's election to be taxed as a REIT, and the Offering. In the opinion of
Goodwin, Procter & Hoar llp, commencing with the Company's taxable year ending
December 31, 1997, the Company will qualify to be taxed as a REIT under the
Code, provided that (i) the elections and other procedural steps described in
this discussion of "Federal Income Tax Consequences" are completed in a timely
fashion and (ii) the Company and the Operating Partnership operate in
accordance with various assumptions and factual representations made by the
Company and the Operating Partnership concerning their business, properties
and operations. It must be emphasized that Goodwin, Procter & Hoar llp's
opinion is based on various assumptions and is conditioned upon such
assumptions and representations made by the Company and the Operating
Partnership concerning their business and properties as set forth in this
Prospectus. Such factual assumptions and representations are set forth below
in this discussion of "Federal Income Tax Consequences." In addition, Goodwin,
Procter & Hoar llp's opinion is based upon the factual representations of the
Company and the Operating Partnership concerning its business and properties
as set forth in this Prospectus. Moreover, such qualification and taxation as
a REIT depends upon the Company's ability to meet, through actual annual
operating results, distribution levels and diversity of stock ownership, the
various qualification tests imposed under the Code discussed below, the
results of which will not be reviewed by Goodwin, Procter & Hoar llp.
Accordingly, no assurance can be given that the actual results of the
Company's operations for any one taxable year will satisfy such requirements.
See "Risk Factors--Failure to Qualify as a REIT."
 
 
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<PAGE>
 
  The opinion of Goodwin, Procter & Hoar llp is also based upon existing law
as currently applicable, IRS regulations, currently published administrative
positions of the IRS and judicial decisions, which are subject to change
either prospectively or retroactively. No assurance can be given that any such
changes would not modify the conclusions expressed in the opinion. Moreover,
unlike a private letter ruling (which will not be sought), an opinion of
counsel is not binding on the IRS, and no assurance can be given that the IRS
will not successfully challenge the status of the Company as a REIT.
 
  If the Company qualifies for taxation as a REIT, it generally will not be
subject to federal corporate income taxes on that portion of its ordinary
income or capital gain that is currently distributed to stockholders. The REIT
provisions of the Code generally allow a REIT to deduct dividends paid to its
stockholders. This deduction for dividends paid to stockholders substantially
eliminates the federal "double taxation" on earnings (once at the corporate
level and once again at the stockholder level) that usually results from
investments in a corporation.
 
  Even if the Company qualifies for taxation as a REIT, however, the Company
will be subject to federal income tax, as follows: First, the Company will be
taxed at regular corporate rates on its undistributed REIT taxable income,
including undistributed net capital gains. Second, under certain
circumstances, the Company may be subject to the "alternative minimum tax."
Third, if the Company has net income from the sale or other disposition of
"foreclosure property" that is held primarily for sale to customers in the
ordinary course of business or other non-qualifying income from foreclosure
property, it will be subject to tax at the highest corporate rate on such
income. Fourth, if the Company has net income from prohibited transactions
(which are, in general, certain sales or other dispositions of property other
than foreclosure property held primarily for sale to customers in the ordinary
course of business), such income will be subject to a 100% tax. Fifth, if the
Company should fail to satisfy either the 75% or 95% gross income test
(discussed below) but has nonetheless maintained 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 the amount by which the
Company fails the 75% or 95% test, multiplied by a fraction intended to
reflect the Company's profitability. Sixth, if the Company fails to distribute
during each 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, the Company will be
subject to a 4% excise tax on the excess of such required distribution over
the amounts actually distributed. Seventh, if the Company should acquire any
asset from a C corporation (i.e., a corporation generally subject to full
corporate-level tax) in a carryover-basis transaction and the Company
subsequently recognizes gain on the disposition of such asset during the ten-
year period (the "Recognition Period") beginning on the date on which the
asset was acquired by the Company, then, to the extent of the excess of (a)
the fair market value of the asset as of the beginning of the applicable
Recognition Period over (b) the Company's adjusted basis in such asset as of
the beginning of such Recognition Period (the "Built-In Gain"), such gain will
be subject to tax at the highest regular corporate rate, pursuant to
guidelines issued by the IRS (the "Built-In Gain Rules").
 
                        REQUIREMENTS FOR QUALIFICATION
 
  To qualify as a REIT, the Company must elect to be so treated and must meet
the requirements, discussed below, relating to the Company's organization,
sources of income, nature of assets and distributions of income to
stockholders.
 
ORGANIZATIONAL REQUIREMENTS
 
  The Code defines a REIT as a corporation, trust or association: (i) that is
managed by one or more directors or trustees, (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 the REIT requirements, (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, and (vi) during
the last half of each taxable year not more than 50% in value of the
outstanding stock of which is owned, directly or indirectly through the
application of certain attribution rules, by five or fewer individuals (as
defined in the Code to include certain entities). In addition, certain other
tests, described below, regarding the nature of its income and assets also
must
 
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<PAGE>
 
be satisfied. The Code provides that conditions (i) through (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. Conditions (v)
and (vi) (the "100 Stockholder Requirement" and "Five or Fewer Requirement")
will not apply until after the first taxable year for which an election is
made to be taxed as a REIT. For purposes of conditions (v) and (vi), pension
funds and certain other tax-exempt entities are treated as individuals,
subject to a "look-through" exception in the case of condition (vi).
 
  Prior to consummation of the Initial Offering, the Company did not satisfy
conditions (v) and (vi) above. The Company's issuance of Common Stock in
connection with the Formation Transactions and the Offering permitted it to
satisfy the 100 Stockholder Requirement and the Five or Fewer Requirement. In
order to protect the Company from a concentration of ownership of its stock
that would cause the Company to fail the Five or Fewer Requirement, the
Company's Certificate provides that stock owned, or deemed to be owned or
transferred to a stockholder in excess of the Ownership Limit or the Look-
Through Ownership Limit will automatically be converted into Excess Stock and
transferred to a charity for resale, with the original stockholder entitled to
receive certain proceeds from such a resale. See "Description of Capital
Stock--Restrictions on Transfers." Excess stock is a separate class of capital
stock of the Company that is entitled to no voting rights but shares ratably
with the Common Stock in dividends and rights upon dissolution. Because of the
absence of authority on this issue, however, there is no assurance that the
operation of the Excess Stock or other provisions contained in the Certificate
will, as a matter of law, prevent a concentration of ownership of stock in
excess of the Ownership Limit from causing the Company to violate the Five or
Fewer Requirement. If there were a concentration of ownership that would cause
the Company to violate the Five or Fewer Requirement, and the operation of the
Excess Stock or other provisions contained in the Certificate were not held to
cure such violation, the Company would be disqualified as a REIT. In rendering
its opinion that the Company is organized in a manner that permits the Company
to qualify as a REIT, Goodwin, Procter & Hoar llp is relying on the
representation of the Company that the ownership of its stock (without regard
to the Excess Stock provisions) satisfies the Five or Fewer Requirement, and
Goodwin, Procter & Hoar llp expresses no opinion as to whether, as a matter of
law, the Excess Stock or other provisions contained in the Certificate
preclude the Company from failing the Five or Fewer Requirement.
 
  In addition, a corporation may not elect to become a REIT unless its taxable
year is the calendar year. The Company's taxable year is the calendar year.
 
  In the case of a REIT that is a partner in a partnership, Treasury
Regulations provide that the REIT will be deemed to own its proportionate
share (based on its interest in partnership capital) 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 shall 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 asset tests. Thus, the Company's proportionate share of the
assets, liabilities and items of income of the Operating Partnership
(including the Operating Partnership's share of the assets and liabilities and
items of income with respect to any partnership in which it holds an interest)
are treated as assets, liabilities and items of income of the Company for
purposes of applying the requirements described herein.
 
INCOME TESTS
 
  To maintain qualification as a REIT, three gross income requirements must be
satisfied annually.
 
  .  First, at least 75% of the Company's gross income, excluding gross
     income from certain dispositions of property held primarily for sale to
     customers in the ordinary course of a trade or business ("prohibited
     transactions"), for each taxable year must be derived directly or
     indirectly from investments relating to real property or mortgages on
     real property (including "rents from real property" and, in certain
     circumstances, interest) or from certain types of temporary investments.
 
  .  Second, at least 95% of the Company's gross income (excluding gross
     income from prohibited transactions) for each taxable year must be
     derived from such real property investments described above and from
     dividends, interest and gain from the sale or disposition of stock or
     securities or from any combination of the foregoing.
 
 
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<PAGE>
 
  .  Third, short-term gain from the sale or other disposition of stock or
     securities, gain from prohibited transactions and gain from 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 the Company's gross income (including gross
     income from prohibited transactions) for each taxable year. For purposes
     of applying the 30% gross income test, the holding period of Properties
     acquired by the Operating Partnership in the Formation Transactions was
     deemed to have commenced on the date of acquisition. Recently enacted
     legislation repealed the 30% gross income test for tax years beginning
     after August 5, 1997.
 
  Rents received or deemed to be received by the Company 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 generally must not be based in whole or in
     part on the income or profits of any person. An amount received or
     accrued generally will not be excluded from the term "rents from real
     property," however, solely by reason of being based on a fixed
     percentage or percentages of receipts or sales.
 
  .  Second, the Code provides that rents received from a tenant will not
     qualify as "rents from real property" in satisfying the gross income
     tests if the REIT, or an owner of 10% or more of the REIT, directly or
     constructively owns 10% or more of such tenant (a "Related Party
     Tenant") or a subtenant of such tenant (in which case only rent
     attributable to the subtenant is disqualified).
 
  .  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 the
     personal property will not qualify as "rents from real property."
 
  .  Finally, for rents to qualify as "rents from real property" the REIT
     must not operate or manage the property or furnish or render services to
     tenants, other than through an "independent contractor" who is
     adequately compensated and from whom the REIT does not derive any
     income; provided, however, that a REIT may provide services with respect
     to its properties and the income will qualify as "rents from real
     property" if the services are "usually or customarily rendered" in
     connection with the rental of room or other space for occupancy only and
     are not otherwise considered "rendered to the occupant."
 
  The Company does not charge rent that is based in whole or in part on the
income or profits of any person (except by reason of being based on a fixed
percentage or percentages of receipts or sales consistent with the rule
described above). The Company does not derive, and does not anticipate
deriving, rent attributable to personal property leased in connection with
real property that exceeds 15% of the total rents.
 
  Pursuant to leases with respect to the Hotel Properties, ZL Hotel LLC leases
from the Operating Partnership the Hotel Properties for a ten year period. The
hotel leases provide that ZL Hotel LLC is obligated to pay to the Operating
Partnership (i) the greater of Base Rent or Participating Rent (collectively,
the "Rents") and (ii) Additional Charges. Participating Rent is calculated by
multiplying fixed percentages by various revenue categories for each of the
Hotel Properties. Both Base Rent and the thresholds in the Participating Rent
formulas will be adjusted for inflation. Base Rent accrues and is required to
be paid monthly. Participating Rent is payable monthly, with monthly
adjustments based on actual results.
 
  In order for Base Rent, Participating Rent and Additional Charges to
constitute "rents from real property," the leases must be respected as true
leases for federal income tax purposes and not treated as service contracts,
joint ventures or some other type of arrangement. The determination of whether
the leases are true leases depends on an analysis of all the surrounding facts
and circumstances. In making such a determination, courts have considered a
variety of factors, including the following: (i) the intent of the parties,
(ii) the form of the agreement, (iii) the degree of control over the property
that is retained by the property owner (e.g., whether the lessee has
substantial control over the operation of the property or whether the lessee
was required simply to use its best efforts to perform its obligations under
the agreement), and (iv) the extent to which the property owner retains the
risk of loss with respect to the property (e.g., whether the lessee bears the
risk of increases in operating expenses or the risk of damage to the property)
or the potential for economic gain (e.g., appreciation ) with respect to the
property.
 
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<PAGE>
 
  In addition, Code section 7701(e) provides that a contract that purports to
be a service contract (or a partnership agreement) is treated instead as a
lease of property if the contract is properly treated as such, taking into
account all relevant factors, including whether or not: (i) the service
recipient is in physical possession of the property, (ii) the service
recipient controls the property, (iii) the service recipient has a significant
economic or possessory interest in the property (e.g., the property's use is
likely to be dedicated to the service recipient for a substantial portion of
the useful life of the property, the recipient shares the risk that the
property will decline in value, the recipient shares in any appreciation in
the value of the property, the recipient shares in savings in the property's
operating costs, or the recipient bears the risk of damage to or loss of the
property), (iv) the service provider does not bear any risk of substantially
diminished receipts or substantially increased expenditures if there is
nonperformance under the contract, (v) the service provider does not use the
property concurrently to provide significant services to entities unrelated to
the service recipient, and (vi) the total contract price does not
substantially exceed the rental value of the property for the contract period.
Since the determination whether a service contract should be treated as a
lease is inherently factual, the presence or absence of any single factor may
not be dispositive in every case. The hotel leases were structured to qualify
as true leases for federal income tax purposes.
 
  Investors should be aware that there are no controlling Treasury
Regulations, published rulings, or judicial decisions involving leases with
terms substantially the same as the hotel leases that discuss whether such
leases constitute true leases for federal income tax purposes. Therefore,
there can be no complete assurance that the IRS will not assert a contrary
position. If the leases are recharacterized as service contracts or
partnership agreements, rather than true leases, part or all of the payments
that the Operating Partnership receives from the lessee would not be
considered rent or would not otherwise satisfy the various requirements for
qualification as "rents from real property." In that case, the Company likely
would not be able to satisfy either the 75% or 95% gross income tests and, as
a result, would lose its REIT status.
 
  As indicated above, "rents from real property" must not be based in whole or
in part on the income or profits of any person. The Participating Rent should
qualify as "rents from real property" since it is based on percentages of
receipts or sales which percentages are fixed at the time the leases are
entered into, provided (i) the leases are not renegotiated during the term of
the leases in a manner that has the effect of basing Participating Rent on
income or profits and (ii) the leases conform with normal business practice.
More generally, the Participating Rent will not qualify as "rents from real
property" if, considering the hotel leases and all the surrounding
circumstances, the arrangement does not conform with normal business practice,
but is in reality used as a means of basing the Participating Rent on income
or profits. Since the Participating Rent is based on fixed percentages of the
gross revenues from the hotels that are established in the hotel leases, and
the Company has represented that the percentages (i) will not be renegotiated
during the terms of the leases in a manner that has the effect of basing the
Participating Rent on income or profits and (ii) conform with normal business
practice, the Participating Rent should not be considered based in whole or in
part on the income or profits of any person. Furthermore, the Company has
represented that, with respect to other hotel properties that it acquires in
the future, it will not 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 fixed percentage of gross revenues, as described above.)
 
  Pursuant to leases with independent third parties, the Operating Partnership
or certain subsidiary partnerships leases the Garage Property and the garage
portions of certain of the Office Properties to independent third parties for
periods between one to three years. The parking leases provide that the
Operating Partnership will receive rent based on the gross receipts of the
parking garage. The same "true lease" and "rent from real property" analysis
applies with respect to the parking leases as is described above for the hotel
leases. The garage leases also have been structured to qualify as true leases
for federal income tax purposes. As is the case with respect to the hotel
leases, there can be no complete assurance that the IRS will not assert a
contrary position, which if successful could result in the loss of the
Company's status as a REIT.
 
  Through the Operating Partnership, which is not an "independent contractor,"
the Company provides certain services with respect to the Properties, but the
Company believes (and has represented to Goodwin, Procter & Hoar llp) that all
such services are considered "usually or customarily rendered" in connection
with the rental of space for occupancy only, so that the provision of such
services does not jeopardize the qualification
 
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<PAGE>
 
of rent from the Properties as "rents from real property." In rendering its
opinion on the Company's ability to qualify as a REIT, Goodwin, Procter & Hoar
llp is relying on such representations. In the case of any services that are
not "usual and customary" under the foregoing rules, the Company intends to
employ "independent contractors" to provide such services.
 
  The Operating Partnership may receive certain types of income with respect
to the properties it owns that will not qualify under the 75% or 95% gross
income test. In particular, dividends on the Company's stock in the
Development and Management Company will not qualify under the 75% gross income
test. The Company believes, however, that the aggregate amount of such non-
qualifying income in any taxable year will not cause the Company to exceed the
limits on non-qualifying income under the 75% and 95% gross income tests.
 
  If the Company 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 that
year if it is eligible for relief under certain provisions of the Code. These
relief provisions generally will be available if (i) the Company's failure to
meet these tests was due to reasonable cause and not due to willful neglect,
(ii) the Company attaches a schedule of the sources of its income to its
Federal income tax return and (iii) any incorrect information on the schedule
is not due to fraud with intent to evade tax. It is not possible, however, to
state whether, in all circumstances, the Company would be entitled to the
benefit of these relief provisions. For example, if the Company fails to
satisfy the gross income tests because nonqualifying income that the Company
intentionally incurs exceeds the limits on such income, the IRS could conclude
that the Company's failure to satisfy the tests was not due to reasonable
cause. As discussed above in "--Opinion of Tax Counsel," even if these relief
provisions apply, a tax would be imposed with respect to the excess net
income. No similar mitigation provision provides relief if the Company were to
fail the 30% income test for its taxable year ending December 31, 1997, and in
such case, the Company would cease to qualify as a REIT for taxable years
beginning after August 5, 1997. The 30% gross income test has been repealed.
See "Risk Factors--Failure to Qualify as a REIT."
 
ASSET TESTS
 
  At the close of each quarter of its taxable year, the Company also must
satisfy three tests relating to the nature and diversification of its assets.
 
  .  First, at least 75% of the value of the Company's total assets must be
     represented by real estate assets, cash, cash items and government
     securities.
 
  .  Second, no more than 25% of the Company'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 the Company may not exceed 5% of
     the value of the Company's total assets, and the Company may not own
     more than 10% of any one issuer's outstanding voting securities.
 
  The 5% test must generally be met for any quarter in which the Company
acquires securities of an issuer. Thus, this requirement must be satisfied not
only on the date the Company acquires securities of the Development and
Management Company, but also each time the Company increases its ownership of
securities of the Development and Management Company (including as a result of
increasing its interest in the Operating Partnership as limited partners
exercise their redemption rights).
 
  The Operating Partnership owns 100% of the nonvoting stock and 1% of the
voting stock of the Development and Management Company, and by virtue of its
ownership of Units, the Company is considered to own its pro rata share of
such stock. Neither the Company nor the Operating Partnership, however, owns
more than 10% of the voting securities of the Development and Management
Company. In addition, the Company and its senior management do not believe
that the Company's pro rata share of the value of the securities of the
Development and Management Company exceeds 5% of the total value of the
Company's assets. The Company's belief is based in part upon its analysis of
the value of the equity and unsecured debt securities of the Development and
Management Company owned by the Operating Partnership relative to the value of
the other assets owned by the Operating Partnership. No independent appraisals
have been obtained to support this conclusion, however, and Goodwin, Procter
and Hoar LLP, in rendering its opinion as to the qualification of the
 
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Company as a REIT, is relying on the conclusions of the Company and its senior
management as to the value of the securities of the Development and Management
Company. There can be no assurance that the IRS might not contend that the
value of the securities of the Development and Management Company held by the
Company (through the Operating Partnership) exceeds the 5% value limitation.
 
  As noted above, the 5% value requirement must be satisfied not only on the
date the Company acquires equity and unsecured debt securities of the
Development and Management Company, but also each time the Company increases
its ownership of such securities of the Development and Management Company
(including as a result of increasing its interest in the Operating Partnership
as partners exercise their redemption rights). Although the Company plans to
take steps to ensure that it satisfied the 5% value test for any quarter with
respect to which retesting is to occur, there can be no assurance that such
steps will always be successful or will not require a reduction in the
Company's overall interest in the Development and Management Company.
 
  After initially meeting the asset tests at the close of any quarter, the
Company 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, the failure can be cured by
disposition of sufficient nonqualifying assets within 30 days after the close
of that quarter. The Company maintains, and will continue to maintain,
adequate records of the value of its assets to ensure compliance with the
asset tests and will take such other actions within 30 days after the close of
any quarter as may be required to cure any noncompliance.
 
ANNUAL DISTRIBUTION REQUIREMENTS
 
  In order to be taxed as a REIT, the Company is required to distribute
dividends (other than capital gain dividends) to its stockholders in an amount
at least equal to (a) the sum of (i) 95% of the Company's "REIT taxable
income" (computed without regard to the dividends-paid deduction and the
Company's capital gain) and (ii) 95% of the net income, if any, from
foreclosure property in excess of the special tax on income from foreclosure
property, minus (b) the sum of certain items of non-cash income. Such
distributions must be paid in the taxable year to which they relate, or in the
following taxable year if declared before the Company timely files its Federal
income tax return for such year and if paid on or before the first regular
dividend payment after such declaration. Even if the Company satisfies the
foregoing distribution requirements, to the extent that the Company does not
distribute all of its net capital gain or "REIT taxable income" as adjusted,
it will be subject to tax thereon at regular capital gains or ordinary
corporate tax rates. Furthermore, if the Company should fail to distribute
during each calendar year at least the sum of (a) 85% of its ordinary income
for that year, (b) 95% of its capital gain net income other than such capital
gain net income which the REIT elects to retain and pay tax on for that year
and (c) any undistributed taxable income from prior periods, the Company would
be subject to a 4% excise tax on the excess of such required distribution over
the amounts actually distributed. Pursuant to recently enacted legislation,
the Company may elect to retain, rather than distribute its net long-term
capital gains for tax years beginning after August 5, 1997. The effect of such
an election is that (i) the Company is required to pay the tax on such gains,
(ii) U.S. Stockholders, while required to include their proportionate share of
the undistributed long-term capital gains in income, will receive a credit or
refund for their share of the tax paid by the REIT and (iii) the basis of U.S.
Stockholder's Common Stock would be increased by the amount of the
undistributed long-term capital gains (minus the amount of capital gains tax
paid by the Company) included in the U.S. Stockholder's long-term capital
gains. In addition, if the Company disposes of any asset subject to the Built-
In Gain Rules during the applicable Recognition Period, the Company will be
required, pursuant to guidance issued by the IRS, to distribute at least 95%
of the Built-In Gain (after tax), if any, recognized on the disposition of the
asset.
 
  The Company intends to make timely distributions sufficient to satisfy the
annual distribution requirements. In this regard, the Operating Partnership
Agreement authorizes the Company, as general partner, to take such steps as
may be necessary to cause the Operating Partnership to distribute to its
partners an amount sufficient to permit the Company to meet these distribution
requirements.
 
  It is expected that the Company's REIT taxable income will be less than its
cash flow due to the allowance of depreciation and other non-cash charges in
computing REIT taxable income. Accordingly, the Company
 
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<PAGE>
 
anticipates that it will generally have sufficient cash or liquid assets to
enable it to satisfy the 95% distribution requirement. It is possible,
however, that the Company, from time to time, may not have sufficient cash or
other liquid assets to meet the 95% distribution requirement or to distribute
such greater amount as may be necessary to avoid income and excise taxation,
as a result of 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 the Company,
or as a result of nondeductible expenses such as principal amortization or
capital expenditures in excess of noncash deductions. In the event that such
timing differences occur, the Company may find it necessary to arrange for
borrowings or, if possible, pay taxable stock dividends in order to meet the
dividend requirement.
 
  Under certain circumstances, the Company may be able to rectify a failure to
meet the distribution requirement for a year by paying "deficiency dividends"
to stockholders in a later year, which may be included in the Company's
deduction for dividends paid for the earlier year. Thus, the Company may be
able to avoid being taxed on amounts distributed as deficiency dividends. The
Company will, however, be required to pay interest based upon the amount of
any deduction taken for deficiency dividends.
 
                              FAILURE TO QUALIFY
 
  If the Company fails to qualify for taxation as a REIT in any taxable year
and the relief provisions do not apply, the Company will be subject to tax
(including any applicable alternative minimum tax) on its taxable income at
regular corporate rates. Distributions to stockholders in any year in which
the Company fails to qualify will not be deductible by the Company nor will
they be required to be made. In such event, to the extent of current or
accumulated earnings and profits, all distributions to stockholders will be
dividends, taxable as ordinary income, and subject to certain limitations of
the Code, corporate distributees may be eligible for the dividends-received
deduction. Unless the Company is entitled to relief under specific statutory
provisions, the Company 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 the Company would be
entitled to such statutory relief. For example, if the Company fails to
satisfy the gross income tests because nonqualifying income that the Company
intentionally incurs exceeds the limit on such income, the IRS could conclude
that the Company's failure to satisfy the tests was not due to reasonable
cause. See "Risk Factors--Failure to Qualify as a REIT--Other Tax
Liabilities."
 
                         TAXATION OF U.S. STOCKHOLDERS
 
  As used herein, the term "U.S. Stockholder" means a holder of Common Stock
that for United States federal income tax purposes (a) is a citizen or
resident of the United States, (b) 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, (c) is an estate or trust, the income of
which is subject to United States federal income taxation regardless of its
source or (d) a trust if a U.S. court is able to exercise primary supervision
over the administration of such trust and one or more U.S. persons have the
authority to control all substantial decisions of such trust. For any taxable
year for which the Company qualifies for taxation as a REIT, amounts
distributed to taxable U.S. Stockholders will be taxed as follows.
 
DISTRIBUTIONS GENERALLY
 
  Distributions to U.S. Stockholders, other than capital gain dividends
discussed below, will constitute dividends up to the amount of the Company's
current or accumulated earnings and profits and will be taxable to the
stockholders as ordinary income. These distributions are not eligible for the
dividends-received deduction for corporations. To the extent that the Company
makes a distribution in excess of its current or accumulated earnings and
profits, the distribution will be treated first as a tax-free return of
capital, reducing the tax basis in the U.S. Stockholder's Common Stock, and
the amount of such distribution in excess of a U.S. Stockholder's tax basis in
its Common Stock will be taxable as gain realized from the sale of its Common
Stock. Dividends declared by the Company in October, November or December of
any year payable to a stockholder of record on a specified date in any such
month shall be treated as both paid by the Company and received by the
stockholder
 
                                      112
<PAGE>
 
on December 31 of the year, provided that the dividend is actually paid by the
Company during January of the following calendar year. Stockholders may not
include on their own federal income tax returns any losses of the Company.
 
  The Company will be treated as having sufficient earnings and profits to
treat as a dividend any distribution by the Company up to the amount required
to be distributed in order to avoid imposition of the 4% excise tax discussed
in "--Opinion of Tax Counsel" above. Moreover, any "deficiency dividend" will
be treated as an ordinary or capital gain dividend, as the case may be,
regardless of the Company's earnings and profits. As a result, stockholders
may be required to treat certain distributions that would otherwise result in
a tax-free return of capital as taxable dividends.
 
CAPITAL GAIN DIVIDENDS
 
  Dividends to U.S. Stockholders that are properly designated by the Company
as capital gain dividends will be treated as long-term capital gains (to the
extent they do not exceed the Company's actual net capital gain) for the
taxable year without regard to the period for which the stockholder has held
his stock. Pursuant to recently enacted legislation, in the case of a
stockholder who is an individual, an estate or a trust, long-term capital
gains and losses are separated into three tax rate groups: a 20% group, a 25%
group and a 28% group and subject to tax at the rate effective for each group.
Pursuant to IRS Notice 97-64, 1997-47 IRB 1, the Company will designate
capital gain dividends, if any, as 20% rate gain distributions, 25% rate gain
distributions or 28% rate distributions and detail such designations in a
notice to its stockholders. Corporate stockholders may be required to treat up
to 20% of certain capital gain dividends as ordinary income. Capital gain
dividends are not eligible for the dividends-received deduction for
corporations.
 
  IRS Notice 97-64 describes temporary regulations that will be issued in
regard to the proper treatment of capital gain dividends and undistributed
capital gains and gives interim guidance that should be followed in this area
until further notice. To the extent that the Company has net capital gain for
a taxable year, dividends paid during the year (or that are deemed to be paid
in a taxable year beginning after December 31, 1997) may be designated by it
as capital gain dividends. In general, a capital gain dividend is treated by
the shareholders as a gain from the sale or exchange of a capital asset held
for more than one year. If the Company designates a dividend as a capital gain
dividend for a taxable year ending on or after May 7, 1997, it may also
designate the dividend as a 20% rate gain distribution, an unrecaptured
section 1250 gain distribution, or a 28% rate gain distribution. If no
additional designation is made regarding a capital gain dividend, it will be
taxable as a 28% rate gain distribution. If any capital gain dividend is
received on or after May 7, 1997, but is treated as being paid during a
taxable year that ends on or before that date, the dividend will be taxable as
a 28% rate gain distribution. This interim guidance may be changed in the
future. As a result, prospective investors are urged to consult their own tax
advisors with respect to the proper treatment of capital gain dividends and
undistributed capital gains.
 
PASSIVE ACTIVITY LOSS AND INVESTMENT INTEREST LIMITATIONS
 
  Distributions from the Company and gain from the disposition of Common Stock
will not be treated as passive activity income, and therefore stockholders may
not be able to apply any "passive losses" against such income. Dividends from
the Company (to the extent they do not constitute a return of capital) will
generally be treated as investment income for purposes of the investment
income limitation. Net capital gain from the disposition of Common Stock and
capital gain dividends generally will be included in investment income for
purposes of the investment interest deduction limitations only if and to the
extent the stockholder so elects, in which case such capital gains will be
taxed as ordinary income.
 
CERTAIN DISPOSITIONS OF SHARES
 
  Losses incurred on the sale or exchange of Common Stock held for less than
six months (after applying certain holding period rules) will be deemed
capital loss to the extent of any capital gain dividends received by the
selling stockholder from those shares. Due to ambiguities in the Taxpayer
Relief Act of 1997, pending guidance from the IRS, it is not clear whether or
how such capital loss will be separated into the 20% group, the 25% group and
the 28% group.
 
 
                                      113
<PAGE>
 
TREATMENT OF TAX-EXEMPT STOCKHOLDERS
 
  Distributions from the Company to a tax-exempt employee pension trust or
other domestic tax-exempt stockholder generally, will not constitute "unrelated
business taxable income" ("UBTI") unless the stockholder has borrowed to
acquire or carry its Common Stock. Qualified trusts that hold more than 10% (by
value) of the shares of certain REITS, however, may be required to treat a
certain percentage of such a REIT's distributions as UBTI. This requirement
will apply only if (i) the REIT would not qualify as such for federal income
tax purposes but for the application of the "look-through" exception to the
Five or Fewer Requirement applicable to shares held by qualified trusts and
(ii) the REIT is "predominantly held" by qualified trusts. A REIT is
predominantly held by qualified trusts if either (i) a single qualified trust
holds more than 25% by value of the interests in the REIT or (ii) one or more
qualified trusts, each owning more than 10% by value of the interests in the
REIT, hold in the aggregate more than 50% of the interests in the REIT. The
percentage of any REIT dividend treated as UBTI is equal to the ratio of (a)
the UBTI earned by the REIT (treating the REIT as if it were a qualified trust
and therefore subject to tax on UBTI) to (b) the total gross income (less
certain associated expenses) of the REIT. A de minimis exception applies where
the ratio set forth in the preceding sentence is less than 5% for any year. For
these purposes, a qualified trust is any trust described in section 401(a) of
the Code and exempt from tax under section 501(a) of the Code. 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 Five or Fewer Requirement
without relying upon the "look-through" exception.
 
              SPECIAL TAX CONSIDERATIONS FOR FOREIGN STOCKHOLDERS
 
  The rules governing United States income taxation of non-resident alien
individuals, foreign corporations, foreign partnerships and foreign trusts and
estates (collectively, "Non-U.S. Stockholders") are complex, and the following
discussion is intended only as a summary of these rules. Prospective Non-U.S.
Stockholders should consult with their own tax advisors to determine the impact
of federal, state and local income tax laws on an investment in the Company,
including any reporting requirements.
 
  In general, Non-U.S. Stockholders will be subject to regular United States
federal income tax with respect to their investment in the Company if the
investment is "effectively connected" with the Non-U.S. Stockholder's conduct
of a trade or business in the United States. A corporate Non-U.S. Stockholder
that receives income that is (or is treated as) effectively connected with a
U.S. trade or business also may be subject to the branch profits tax under
section 884 of the Code, which is payable in addition to regular United States
federal corporate income tax. The following discussion will apply to Non-U.S.
Stockholders whose investment in the Company is not so effectively connected.
 
  A distribution by the Company that is not attributable to gain from the sale
or exchange by the Company of a United States real property interest and that
is not designated by the Company as a capital gain dividend will be treated as
an ordinary income dividend to the extent that it is made out of current or
accumulated earnings and profits. Generally, any ordinary income dividend will
be subject to a United States federal income tax equal to 30% of the gross
amount of the dividend unless this tax is reduced by an applicable tax treaty.
Such a distribution in excess of the Company's earnings and profits will be
treated first as a return of capital that will reduce a Non-U.S. Stockholder's
basis in its Common Stock (but not below zero) and then as gain from the
disposition of such shares, the tax treatment of which is described under the
rules discussed below with respect to dispositions of Common Stock.
 
  Distributions by the Company that are attributable to gain from the sale or
exchange of a United States real property interest will be taxed to a Non-U.S.
Stockholder under the Foreign Investment in Real Property Tax Act of 1980
("FIRPTA"). Under FIRPTA, such distributions are taxed to a Non-U.S.
Stockholder as if the distributions were gains "effectively connected" with a
United States trade or business. Accordingly, a Non-U.S. Stockholder will be
taxed at the normal capital gain rates applicable to a U.S. Stockholder
(subject to any applicable alternative minimum tax and a special alternative
minimum tax in the case of non-resident alien individuals). Distributions
subject to FIRPTA also may be subject to a 30% branch profits tax when made to
a foreign corporate stockholder that is not entitled to treaty exemptions.
 
                                      114
<PAGE>
 
  Although tax treaties may reduce the Company's withholding obligations, the
Company generally will be required to withhold from distributions to Non-U.S.
Stockholders, and remit to the IRS, (i) 35% of designated capital gain
dividends (or, if greater, 35% of the amount of any distributions that could be
designated as capital gain dividends) and (ii) 30% of ordinary dividends paid
out of earnings and profits. In addition, if the Company designates prior
distributions as capital gain dividends, subsequent distributions, up to the
amount of such prior distributions, will be treated as capital gain dividends
for purposes of withholding. A distribution in excess of the Company's earnings
and profits will be subject to 30% dividend withholding if at the time of the
distribution it cannot be determined whether the distribution will be in an
amount in excess of the Company's current or accumulated earnings and profits.
If the amount of tax withheld by the Company with respect to a distribution to
a Non-U.S. Stockholder exceeds the stockholder's United States tax liability
with respect to such distribution, the Non-U.S. Stockholder may file for a
refund of such excess from the IRS.
 
  Unless the Common Stock constitutes a "United States real property interest"
within the meaning of FIRPTA, a sale of Common Stock by a Non-U.S. Stockholder
generally will not be subject to United States federal income taxation. The
Common Stock will not constitute a United States real property interest if the
Company 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 shares is held directly or indirectly by Non-U.S. Stockholders. It
is currently anticipated that the Company will be a domestically controlled
REIT and therefore that sales of Common Stock will not be subject to taxation
under FIRPTA. However, because the Common Stock will be publicly traded, no
assurance can be given that the Company will continue to be a domestically
controlled REIT. If the Company were not a domestically controlled REIT,
whether a Non-U.S. Stockholder's sale of Common Stock would be subject to tax
under FIRPTA as a sale of a United States real property interest would depend
on whether the Common Stock were "regularly traded" on an established
securities market (such as the NYSE on which the Common Stock will be listed)
and on the size of the selling stockholder's interest in the Company. If the
gain on the sale of Common Stock were subject to taxation under FIRPTA, the
Non-U.S. Stockholder would be subject to the same treatment as a U.S.
Stockholder with respect to the gain (subject to any applicable alternative
minimum tax and a special alternative minimum tax in the case of non-resident
alien individuals). In addition, distributions that are treated as gain from
the disposition of Common Stock and are subject to tax under FIRPTA also may be
subject to a 30% branch profit tax when made to a foreign corporate stockholder
that is not entitled to treaty exemptions. In any event, a purchaser of Common
Stock from a Non-U.S. Stockholder will not be required to withhold under FIRPTA
on the purchase price if the purchased Common Stock is "regularly traded" on an
established securities market (such as the NYSE) or if the Company is a
domestically controlled REIT. Otherwise, under FIRPTA the purchaser of Common
Stock may be required to withhold 10% of the purchase price and remit this
amount to the IRS. Capital gains not subject to FIRPTA will be taxable to a
Non-U.S. Stockholder if the Non-U.S. Stockholder is a non-resident alien
individual who is present in the United States for 183 days or more during the
taxable year and certain other conditions apply, in which case the non-resident
alien individual will be subject to a 30% tax on his or her U.S. source capital
gains.
 
  On October 6, 1997, the U.S. Treasury Department issued final Treasury
regulations governing information reporting and the certification procedures
regarding withholding and backup withholding on certain amounts paid to Non-
U.S. Stockholders after December 31, 1998. The new Treasury regulations may
alter the procedures for claiming the benefits of an income tax treaty. Non-
U.S. Stockholders should consult their tax advisors concerning the effect, if
any, of such new Treasury regulations on an investment in Common Stock.
 
         INFORMATION REPORTING REQUIREMENTS AND BACKUP WITHHOLDING TAX
 
  Under certain circumstances, U.S. Stockholders may be subject to backup
withholding at a rate of 31% on payments made with respect to, or cash proceeds
of a sale or exchange of, Common Stock. Backup withholding will apply only if
the holder (i) fails to furnish his or her taxpayer identification number
("TIN") (which, for an individual, would be his or her Social Security Number),
(ii) furnishes an incorrect TIN, (iii) is notified by the IRS that he or she
has failed properly to report payments of interest and dividends or is
otherwise subject to backup withholding or (iv) under certain circumstances,
fails to certify, under penalties of perjury, that he or she has furnished a
correct TIN and (a) that he or she has not been notified by the IRS that he or
she is subject to backup withholding for failure to report interest and
dividend payments or (b) that he or she has been notified by
 
                                      115
<PAGE>
 
the IRS that he or she is no longer subject to backup withholding. Backup
withholding will not apply with respect to payments made to certain exempt
recipients, such as corporations and tax-exempt organizations.
 
  U.S. Stockholders should consult their own tax advisors regarding their
qualifications for exemption from backup withholding and the procedure for
obtaining such an exemption. Backup withholding is not an additional tax.
Rather, the amount of any backup withholding with respect to a payment to a
U.S. Stockholder will be allowed as a credit against the U.S. Stockholder's
United States federal income tax liability and may entitle the U.S. Stockholder
to a refund, provided that the required information is furnished to the IRS.
 
  Additional issues may arise pertaining to information reporting and backup
withholding for Non-U.S. Stockholders. Non-U.S. Stockholders should consult
their tax advisors with regard to U.S. information reporting and backup
withholding.
 
                            OTHER TAX CONSIDERATIONS
 
EFFECT OF TAX STATUS OF OPERATING PARTNERSHIP ON REIT QUALIFICATION
 
  Substantially all of the Company's investments are through the Operating
Partnership. In addition, the Operating Partnership holds interests in certain
Properties through subsidiary partnerships. The Company's interest in these
partnerships may involve special tax considerations. Such considerations
include (i) the allocations of items of income and expense, which could affect
the computation of taxable income of the Company, (ii) the status of the
Operating Partnership, and other subsidiary partnerships as partnerships (as
opposed to associations taxable as corporations) for federal income tax
purposes, and (iii) the taking of actions by the Operating Partnership and
subsidiary partnerships that could adversely affect the Company's
qualifications as a REIT. In the opinion of Goodwin, Procter & Hoar LLP, based
on certain representations of the Company and its subsidiaries, each of the
Operating Partnership, and the other subsidiary partnerships in which the
Operating Partnership has an interest will be treated for Federal income tax
purposes as a partnership (and not as an association taxable as a corporation).
If any of the Operating Partnership, or other subsidiary partnerships in which
the Operating Partnership has an interest were treated as an association
taxable as a corporation, the Company would fail to qualify as a REIT for a
number of reasons.
 
TAX ALLOCATIONS WITH RESPECT TO THE PROPERTIES
 
  When property is contributed to a partnership in exchange for an interest in
the partnership, the partnership generally takes a carryover basis in that
property for tax purposes equal to the adjusted basis of the contributing
partner in the property, rather than a basis equal to the fair market value of
the property at the time of contribution. Pursuant to section 704(c) of the
Code, income, gain, loss and deduction attributable to such contributed
property must be allocated in a manner such that the contributing partner is
charged with, or benefits from, respectively, the unrealized gain or unrealized
loss associated with the property at the time of the 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 (a "Book-Tax Difference"). Such allocations are solely for Federal
income tax purposes and do not affect the book capital accounts or other
economic or legal arrangements among the partners. The Operating Partnership
was formed by way of contributions of appreciated property (including certain
of the Properties). Consequently, the Operating Partnership Agreement requires
such allocations to be made in a manner consistent with section 704(c) of the
Code. Final and temporary Regulations under Section 704(c) of the Code provide
partnerships with a choice of several methods of accounting for Book-Tax
Differences for property contributed to a partnership on or after December 21,
1993, including the retention of the "traditional method" that was available
under prior law or the election of certain alternative methods. Currently, the
Company intends to elect the "traditional method with curative allocations" of
Section 704(c) allocations. Under the traditional method, which is the least
favorable method from the Company's perspective, the carryover basis of
contributed interests in the Properties in the hands of the Operating
Partnership could cause the Company (i) to be allocated lower amounts of
depreciation deductions for tax purposes than would be allocated to the Company
if all Properties were to have a tax basis equal to their fair market value at
the time of the contribution (the "ceiling rule") and (ii) to be allocated
taxable gain in the event of a sale of such contributed interests in the
Properties in excess of the economic or book income allocated to the Company as
a result of such
 
                                      116
<PAGE>
 
sale, with a corresponding benefit to the other partners in the Operating
Partnership. If the "traditional method with curative allocations" is elected
by the Company the Operating Partnership Agreement may specially allocate
taxable gain on sale of the Properties to the contributing partners up to the
aggregate amount of depreciation deductions with respect to each such Property
that the "ceiling rule" prevented the Company from being allocated.
 
  Interests in the Properties purchased for cash by the Operating Partnership
simultaneously with or subsequent to the admission of the Company to the
Operating Partnership initially had a tax basis equal to their fair market
value. Thus, Section 704(c) of the Code does not apply to such interests.
 
  A portion of the amounts to be used to fund distributions to stockholders is
expected to come from the Development and Management Company, through dividends
on stock held by the Operating Partnership. The Development and Management
Company will not qualify as a REIT and will pay federal, state and local income
taxes on its taxable income at normal corporate rates. The federal, state or
local income taxes that the company is required to pay will reduce the amount
of dividends payable by such company to the Operating Partnership and cash
available for distribution by the Company, which in turn could require the
Operating Partnership to secure funds from additional sources in order to allow
the Company to make required distributions.
 
  As described above, the value of the equity and unsecured debt securities of
the Development and Management Company held by the Company cannot exceed 5% of
the value of the Company's assets at a time when a Partner exercises his
redemption right (or the Company otherwise is considered to acquire additional
securities of the Development and Management Company). See "--Requirements for
Qualification--Asset Tests." This limitation may restrict the ability of the
Development and Management Company to increase the size of its respective
business unless the value of the assets of the Company is increasing at a
commensurate rate.
 
                              STATE AND LOCAL TAX
 
  The Company and its operating subsidiaries may be subject to state and local
tax in states and localities in which they do business or own property. The tax
treatment of the Company and its operating subsidiaries and the holders of
Common Stock in such jurisdictions may differ from the federal income tax
treatment described above.
 
  In addition, the Taxpayer Relief Act of 1997 includes several provisions,
some of which have been indicated in the discussion above, that will liberalize
certain of the requirements for qualification as a REIT. However, these
provisions will have neither a material beneficial effect nor a material
adverse effect on the Company's ability to operate as a REIT.
 
                                      117
<PAGE>
 
                                 UNDERWRITING
 
  Subject to the terms and conditions in the United States purchase agreement
(the "U.S. Purchase Agreement"), among the Company and each of the
underwriters named below (the "U.S. Underwriters"), and concurrently with the
sale of 2,800,000 shares to the International Managers (as defined below), the
Company has agreed to sell to each of the U.S. Underwriters, for whom Goldman,
Sachs & Co., Merrill Lynch, Pierce, Fenner & Smith Incorporated, Bear, Stearns
& Co. Inc., Morgan Stanley & Co. Incorporated, PaineWebber Incorporated,
Prudential Securities Incorporated, Smith Barney Inc. and Chase Securities
Inc. are acting as representatives (the "U.S. Representatives"), and each of
the U.S. Underwriters has severally agreed to purchase from the Company, the
respective number of shares of Common Stock set forth opposite their
respective names:
 
<TABLE>
<CAPTION>
                                                                      NUMBER OF
           UNDERWRITER                                                  SHARES
           -----------                                                ----------
      <S>                                                             <C>
      Goldman, Sachs & Co. ..........................................
      Merrill Lynch, Pierce, Fenner & Smith
       Incorporated..................................................
      Bear, Stearns & Co. Inc. ......................................
      Morgan Stanley & Co. Incorporated .............................
      PaineWebber Incorporated ......................................
      Prudential Securities Incorporated ............................
      Smith Barney Inc. .............................................
      Chase Securities Inc. .........................................
                                                                      ----------
          Total...................................................... 11,200,000
                                                                      ==========
</TABLE>
 
  The Company has also entered into a purchase agreement (the "International
Purchase Agreement" and, together with the U.S. Purchase Agreement, the
"Purchase Agreements") with certain underwriters outside the United States and
Canada (the "International Managers" and, together with the U.S. Underwriters,
the "Underwriters") for whom Goldman Sachs International, Merrill Lynch
International, Bear, Stearns International Limited, Morgan Stanley & Co.
International Limited, PaineWebber International (UK) Ltd., Prudential-Bache
Securities (U.K.) Inc., Smith Barney Inc. and Chase Manhattan International
Limited are acting as lead managers. Subject to the terms and conditions set
forth in the International Purchase Agreement and concurrently with the sale
of 11,200,000 shares of Common Stock to the U.S. Underwriters pursuant to the
U.S. Purchase Agreement, the Company has agreed to sell to the International
Managers, and the International Managers have severally agreed to purchase
from the Company, an aggregate of 2,800,000 shares of Common Stock. The public
offering price per share and the total underwriting discount per share are
identical under the U.S. Purchase Agreement and the International Purchase
Agreement.
 
  In each Purchase Agreement, the several U.S. Underwriters and the several
International Managers have agreed, respectively, subject to the terms and
conditions set forth in such Purchase Agreement, to purchase all of the shares
of Common Stock being sold pursuant to such Purchase Agreement if any of such
shares of Common Stock are purchased. Under certain circumstances, the
commitments of non-defaulting U.S. Underwriters or International Managers (as
the case may be) may be increased. The sale of shares of Common Stock pursuant
to the U.S. Purchase Agreement and the International Purchase Agreement are
conditioned upon each other.
 
  The U.S. Representatives have advised the Company that the U.S. Underwriters
propose to offer the Common Stock to the public at the public offering price
set forth on the cover page of this Prospectus and to certain dealers at such
price less a concession not in excess of $  per share. The U.S. Underwriters
may allow, and such dealers may re-allow, a discount not in excess of $  per
share on sales to certain other brokers and dealers. After the date of this
Prospectus, the public offering price and concession and discount may be
changed.
 
  The Company has been informed that the U.S. Underwriters and the
International Managers have entered into an agreement (the "Intersyndicate
Agreement") providing for the coordination of their activities. Under the
terms of the Intersyndicate Agreement, the U.S. Underwriters and the
International Managers are permitted to sell shares of Common Stock to each
other for purposes of resale at the public offering price, less an amount not
greater than the selling concession. Under the terms of the Intersyndicate
Agreement, the International Managers
 
                                      118
<PAGE>
 
and any dealer to whom they sell shares of Common Stock will not offer to sell
or sell shares of Common Stock to persons who are United States persons or
Canadian persons or to persons they believe intend to resell to persons who
are United States persons or Canadian persons, and the U.S. Underwriters and
any dealer to whom they sell shares of Common Stock will not offer to sell or
sell shares of Common Stock to persons who are non-United States and non-
Canadian persons or to persons they believe intend to resell to non-United
States and non-Canadian persons, except in each case for transactions pursuant
to such agreement.
 
  The Company has granted to the U.S. Underwriters an option, exercisable for
30 days after the date of this Prospectus, to purchase up to 1,680,000
additional shares of Common Stock to cover overallotments, if any, at the
public offering price, less the underwriting discount set forth on the cover
page of this Prospectus. If the U.S. Underwriters exercise this option, each
U.S. Underwriter will have a firm commitment, subject to certain conditions,
to purchase approximately the same percentage thereof which the number of
shares of Common Stock to be purchased by it shown in the foregoing table
bears to such U.S. Underwriters' initial amount reflected in the foregoing
table. The Company also has granted an option to the International Managers,
exercisable during the 30-day period after the date of this Prospectus, to
purchase up to 420,000 additional shares of Common Stock to cover
overallotments, if any, on terms similar to those granted to the U.S.
Underwriters.
 
  In the Purchase Agreements, the Company has agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act.
 
  The Company, the Operating Partnership and certain persons who owned
interests in one or more of the Properties prior to the Initial Offering and
who received OP Units in exchange for such interests in the Formation
Transactions (the "Non-Affiliated Participants") agreed, subject to certain
exceptions, not to sell, offer or contract to sell, grant any option for the
sale of, or otherwise dispose of any shares of Common Stock or OP Units, or
any securities convertible into or exchangeable for Common Stock or OP Units,
for a period of one year from June 1997, without the prior written consent of
Goldman, Sachs & Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated.
The Company has granted certain registration rights pursuant to which the Non-
Affiliated Participants may require the Company to file a registration
statement with the Securities and Exchange Commission with respect to sales of
any shares received by the Non-Affiliated Participants in exchange for their
OP Units after the expiration of the one-year period.
 
  Messrs. Zuckerman and Linde and the senior officers of the Company who
received OP Units and/or shares of Common Stock in the Formation Transactions
have agreed, subject to certain exceptions, not to sell, offer or contract to
sell, grant any option for the sale of, or otherwise dispose of any shares of
Common Stock or OP Units for a period of two years from June 1997, without the
prior written consent of Goldman, Sachs & Co. and Merrill Lynch, Pierce,
Fenner & Smith Incorporated.
 
  Until the distribution of the Common Stock is completed, rules of the
Securities and Exchange Commission may limit the ability of the Underwriters
and certain selling group members to bid for and purchase the Common Stock. As
an exception to these rules, the U.S. Representatives are permitted to engage
in certain transactions that stabilize the price of the Common Stock. Such
transactions consist of bids or purchases for the purpose of pegging, fixing
or maintaining the price of the Common Stock.
 
  If the Underwriters create a short position in the Common Stock in
connection with this Offering, i.e., if they sell more shares of Common Stock
than are set forth on the cover page of this Prospectus, the U.S.
Representatives and the International Managers, respectively, may reduce that
short position by purchasing Common Stock in the open market. The U.S.
Representatives and the International Managers, respectively, may also elect
to reduce any short position by exercising all or part of the over-allotment
option described above.
 
  The U.S. Representatives and the International Managers, respectively, may
also impose a penalty bid on certain Underwriters and selling group members.
This means that if the U.S. Representatives or the International Managers
purchase shares of Common Stock in the open market to reduce the Underwriters'
short position or to stabilize the price of the Common Stock, they may reclaim
the amount of the selling concession from the Underwriters and selling group
members who sold those shares as part of this Offering.
 
                                      119
<PAGE>
 
  In general, purchases of a security for the purpose of stabilization or to
reduce a short position could cause the price of the security to be higher
than it might be in the absence of such purchases. The imposition of a penalty
bid might also have an effect on the price of a security to the extent that it
were to discourage resales of the security.
 
  Neither the Company nor any of the Underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the
transactions described above may have on the price of the Common Stock. In
addition, none of the Underwriters makes any representation that the U.S.
Representatives or the International Managers will engage in such transactions
or that such transactions, once commenced, will not be discontinued without
notice.
 
                                    EXPERTS
 
  The combined historical financial statements and financial statement
schedule of the Boston Properties Predecessor Group included in this
Prospectus and the Registration Statement of which this Prospectus is a part,
to the extent and for the periods indicated in their reports and the
Statements of Revenue over Certain Operating Expenses of 280 Park Avenue, 100
East Pratt Street, 875 Third Avenue and Riverfront Plaza for the year ended
December 31, 1996, have been audited by Coopers & Lybrand L.L.P., independent
accountants, and are included herein in reliance upon the authority of such
firm as experts in accounting and auditing.
 
  In addition, certain statistical information provided under the captions
"Prospectus Summary--The Properties" and "Business and Properties" has been
prepared by Spaulding & Slye, and is included herein in reliance upon the
authority of such firm as expert in, among other things, office and industrial
real estate market conditions.
 
                                 LEGAL MATTERS
 
  Certain legal matters, including the validity of the shares of Common Stock
offered hereby, will be passed upon for the Company by Goodwin, Procter & Hoar
LLP. In addition, the description of federal income tax consequences contained
in this Prospectus under the heading "Federal Income Tax Consequences" is
based upon the opinion of Goodwin, Procter & Hoar LLP. Gilbert G. Menna, the
sole shareholder of Gilbert G. Menna, P.C., a partner of Goodwin, Procter &
Hoar llp, serves as an Assistant Secretary of the Company. Certain partners of
Goodwin, Procter & Hoar LLP or their affiliates, together with Mr. Menna, own
approximately 20,000 shares of Common Stock. Goodwin, Procter & Hoar llp
occupies approximately 26,000 square feet at 599 Lexington Avenue under a
lease with the Company that expires in 2002.
 
  Certain legal matters will be passed upon for the Underwriters by Skadden,
Arps, Slate, Meagher & Flom LLP.
 
                                      120
<PAGE>
 
                             ADDITIONAL INFORMATION
 
  The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-11 (of which this Prospectus
is a part) under the Securities Act with respect to the securities offered
hereby. This Prospectus does not contain all information set forth in the
Registration Statement, certain portions of which have been omitted as
permitted by the rules and regulations of the Commission. Statements contained
in this Prospectus as to the content of any contract or other document are not
necessarily complete, and in each instance reference is made to the copy of
such contract or other document filed as an exhibit to the Registration
Statement, each such statement being qualified in all respects by such
reference and the exhibits and schedules hereto. For further information
regarding the Company and the Common Stock offered hereby, reference is hereby
made to the Registration Statement and such exhibits and schedules, which may
be obtained from the Commission as its principal office at 450 Fifth Street,
Northwest, Washington, D.C. 20549, upon payment of the fees prescribed by the
Commission. The Commission maintains a website at http://www.sec.gov containing
reports, proxy and information statements and other information regarding
registrants, including the Company, that file electronically with the
Commission.
 
  Statements contained in this Prospectus as to the contents of any contract or
other document that is filed as an exhibit to the Registration Statement are
not necessarily complete, and each such statement is qualified in its entirety
by reference to the full text of such contract or document.
 
  The Company is required to file reports and other information with the
Commission pursuant to the Securities Exchange Act of 1934. In addition to
applicable legal or NYSE requirements, if any, holders of Common Shares will
receive annual reports containing audited financial statements with a report
thereon by the Company's independent certified public accounts, and quarterly
reports containing unaudited financial information for each of the first three
quarters of each fiscal year.
 
                                      121
<PAGE>
 
                                   GLOSSARY
 
  "100 Stockholder Requirement" means the requirement that beneficial
ownership of a corporation must be held by 100 or more persons in order to
qualify as a REIT under the Code.
 
  "1940 Act" means the Investment Company Act of 1940, as amended.
 
  "Absorption" means the net increase in square feet of leased space.
 
  "ADA" means the Americans with Disabilities Act, enacted on July 26, 1990.
 
  "ADR" means the average daily rate of a Hotel Property.
 
  "Annualized Net Effective Rent" is calculated for leases in effect as of
September 30, 1997 as follows: Annualized Rent, calculated as described below
(but by determining monthly rent on a straight line basis in accordance with
GAAP rather than adding back any rent abatement) was reduced to reflect the
annualized costs of tenant improvements and leasing commissions, if any, paid
or payable by the Company (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 twelve).
 
  "Annualized Rent" means the monthly contractual rent under existing leases
as of September 30, 1997 multiplied by twelve. This amount reflects total rent
before any rent abatements and includes expense reimbursements, which may be
estimates as of such date.
 
  "Average Effective Annual Rent" means the contractual rent for the month of
December of the applicable year, presented on a straight-line basis in
accordance with GAAP, exclusive of tenant pass-throughs of operating and other
expenses.
 
  "Beneficiary" means the qualified charitable organization selected by the
Company to serve as the beneficiary of the trust which shall hold any Excess
Shares.
 
  "Book-Tax Difference" means 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.
 
  "Boston Properties Predecessor Group" means Boston Properties, Inc., the
Property Partnerships and the other entities which owned interests in one or
more of the Properties or in other assets that were contributed to the Company
in connection with the Formation Transactions.
 
  "Built-In Gain" means the excess of the fair market value of an asset as of
the beginning of the applicable Recognition Period over the Company's adjusted
basis in such asset as of the beginning of such Recognition Period.
 
  "Built-In Gain Rules" means the built-in gain rules promulgated in
guidelines issued by the IRS.
 
  "Bylaws" means the Amended and Restated Bylaws of the Company.
 
  "Certificate" means the Amended and Restated Certificate of Incorporation of
the Company.
 
  "Class A Office Buildings" means buildings that are centrally located,
professionally managed and maintained, attract high-quality tenants and
command upper-tier rental rates, and are modern structures or have been
modernized to successfully compete with newer buildings.
 
  "Code" means the Internal Revenue Code of 1986, as amended, together with
its predecessor.
 
  "Commission" or the "SEC" means the Securities and Exchange Commission.
 
  "Common Stock" means shares of the Company's common stock, $.01 par value
per share.
 
 
                                      122
<PAGE>
 
  "Company" means Boston Properties, Inc., a Delaware corporation, and its
subsidiaries on a consolidated basis, including the Operating Partnership and
the Development and Management Company.
 
  "Company Quoted Rental Rate" means the weighted average rental rate per
square foot quoted by the Company as of October 1, 1997, based on the total
net rentable square feet of Properties in the applicable submarket. This rate
is not adjusted to a full-service equivalent rate in markets in which the
Company's rates are not quoted on a full-service basis.
 
  "Continuing Investors" means the persons who held a direct or indirect
interest in the assets of the Company prior to the Offering.
 
  "Development and Management Company" means Boston Properties Management,
Inc., the subsidiary of the Operating Partnership which succeeded to a portion
of the third-party commercial real estate property management business of
Boston Properties, Inc.
 
  "Designated Property" means any of 599 Lexington Avenue, One and Two
Independence Square, and Capital Gallery, or a successor property acquired in
a "like kind" exchange for such a property.
 
  "Development Properties" means the five Office Properties and one Hotel
Property under development or redevelopment by the Company at December 1,
1997.
 
  "DGCL" means the Delaware General Corporation Law.
 
  "Direct Vacancy Rate" means space immediately available by landlords.
 
  "EBITDA" means earnings before interest, taxes, depreciation and
amortization.
 
  "Excess Shares" means those shares of Common Stock in excess of the
Ownership Limit, the Look-Through Ownership Limit, the Related Party Limit, or
the Certificate which are automatically converted into an equal number of
shares of Excess Stock.
 
  "Excess Stock" means the separate class of shares of stock of the Company
into which shares of stock of the Company owned, or deemed to be owned, or
transferred to a stockholder in excess of the Ownership Limit, the Related
Party Limit or the Look-Through Ownership Limit, as applicable, will
automatically be converted.
 
  "FIRPTA" means the Foreign Investment in Real Property Tax Act of 1980, as
amended.
 
  "Five or Fewer Requirement" means the requirement under the Code that not
more than 50% in value of the Company's outstanding shares of Stock may be
owned, directly or indirectly, by five or fewer individuals (as defined in the
Code) during the last half of a taxable year (other than the first year).
 
  "Formation Transactions" means the transactions relating to the formation of
the Company and its subsidiaries, including the transfer to the Company upon
the completion of the Initial Offering of the Properties from the Property
Partnerships and other entities which owned one or more Properties prior to
the completion of the Initial Offering and the development, project management
and property management businesses of Boston Properties, Inc.
 
  "Funds from Operations" means, in accordance with the resolution adopted by
the Board of Governors of NAREIT, net income (loss) (computed in accordance
with GAAP), excluding significant non-recurring items, gains (or losses) from
debt restructuring and sales of property, plus depreciation and amortization
on real estate assets, and after adjustments for unconsolidated partnerships
and joint ventures.
 
  "GAAP" means generally accepted accounting principles.
 
  "Garage Property" means the 1,170 space parking garage in which the Company
has an interest.
 
  "Greater Boston" means the city of Boston and ninety surrounding
municipalities in the Commonwealth of Massachusetts, as designated by
Spaulding & Slye in its market study cited herein.
 
                                      123
<PAGE>
 
  "Greater Washington, D.C." means the city of Washington, D.C. and fifty
surrounding municipalities, as designated by Spaulding & Slye in its market
study cited herein.
 
  "GSA" means the General Services Administration of the United States
Government.
 
  "Hotel Development Property" means the limited service extended stay hotel
currently under development by the Company.
 
  "Hotel Properties" means the two full service hotels and one limited service
extended stay hotel (which is currently under development) which the Company
owns.
 
  "HVAC" means heating, ventilation and air conditioning.
 
  "Industrial Properties" means the nine industrial properties in which the
Company has an interest.
 
  "International Purchase Agreement" means the purchase agreement among the
Company and the International Managers.
 
  "International Managers" means the underwriters outside the United States
and Canada named in this Prospectus for whom Goldman Sachs International and
Merrill Lynch International are acting as lead managers.
 
  "Intersyndicate Agreement" means the agreement between the U.S. Underwriters
and the International Managers providing for the coordination of their
activities.
 
  "IRS" means the Internal Revenue Service.
 
  "LIBOR" means the London Interbank Offered Rate.
 
  "Look-Through Ownership Limit" means the ownership limit applicable to
entities which are looked through for purposes of the Five or Fewer
Requirement restricting such entities to holding no more than 15.0% of the
number of outstanding shares of any class or series of capital stock of the
Company.
 
  "Marriott (R)" means Marriott International, Inc., the manager of the three
Hotel Properties.
 
  "MIT" means the Massachusetts Institute of Technology.
 
  "Mortgage Debt" means the total mortgage debt secured by the Properties
following the Offering.
 
  "Named Executive Officers" means the Company's Chief Executive Officer and
each of the Company's four other most highly compensated executive officers.
 
  "NAREIT" means the National Association of Real Estate Investment Trusts.
 
  "Non-U.S. Stockholders" means non-United States stockholders for federal
income tax purposes.
 
  "NYSE" means the New York Stock Exchange, Inc.
 
  "Offering" means the offering of shares of Common Stock of the Company
pursuant to, and as described in, this Prospectus.
 
  "Office Development Properties" means the five office properties currently
under development by the Company.
 
  "Office Properties" means the 43 Class A Office Buildings, including five
Class A Office Buildings currently under development by the Company and one
Class A Office Building expected to be acquired in January 1998, and 27 R&D
properties, in which the Company has an interest.
 
  "OP Units" means limited and general partnership interests in the Operating
Partnership.
 
 
                                      124
<PAGE>
 
  "Operating Partnership" means Boston Properties Limited Partnership, a
Delaware limited partnership.
 
  "Operating Partnership Agreement" means the amended and restated agreement
of limited partnership of the Operating Partnership.
 
  "Ownership Limit" means the restriction contained in the Company's
Certificate providing that, subject to certain exceptions, no holder may own,
or be deemed to own by virtue of the attribution provision of the Code, more
than 6.6% of the number of outstanding shares of any class or series of
capital stock of the Company.
 
  "Personal Property" means the property in which Messrs. Zuckerman and Linde
hold ownership interests but which was not contributed to the Company as part
of the Formation Transactions.
 
  "Plan" means the Boston Properties, Inc. 1997 Stock Option and Incentive
Plan.
 
  "Preferred Stock" means shares of Series E preferred stock of the Company,
$.01 par value per share.
 
  "Prohibited Owner" means a person or entity holding record title to shares
of Common Stock in excess of the Ownership Limit, the Look-Through Ownership
Limit, the Related Party Limit, or the Certificate.
 
  "Prohibited Transferee" means the transferee of any purported transfer of
capital stock of the Company or any other event which would otherwise result
in the transferee violating the Ownership Limit, the Look-Through Ownership
Limit, the Related Party Limit, or the Certificate.
 
  "Properties" means the 83 commercial real estate properties referred to
herein in which the Company has an interest (including the Development
Properties and the Riverfront Plaza Property expected to be acquired by the
Company in January 1998).
 
  "Property Partnership" means a general or limited partnership which, prior
to the Formation Transactions, owned or had an interest in one or more
Properties.
 
  "Prospectus" means this prospectus, as the same may be amended.
 
  "Purchase Agreements" means the U.S. Purchase Agreement and the
International Purchase Agreement.
 
  "R&D Properties" means the 27 Office Properties in which the Company has an
interest that support both office, research and development and other
technical uses.
 
  "Recognition Period" means the ten-year period beginning on the date on
which the Company acquires an asset from a C corporation in a carry-over basis
transaction.
 
  "REIT" means real estate investment trust, as defined by Sections 856
through 860 of the Code and applicable Treasury Regulations.
 
  "REIT Requirements" means the requirements for qualifying as a REIT under
Sections 856 through 860 of the Code and applicable Treasury Regulations.
 
  "Related Party" means each of Messrs. Zuckerman and Linde, their respective
heirs, legatees and devisees, and any other person whose beneficial ownership
of shares of Common Stock would be attributed under the Code to Messrs.
Zuckerman, Linde, or their respective heirs, legatees or devisees.
 
  "Related Party Ownership Limit" means the ownership limit applicable to each
of Mr. Zuckerman and associated related parties and Mr. Linde and associated
related parties restricting each such class of persons to holding no more than
15.0% of the number of outstanding shares of any class or series of capital
stock of the Company.
 
                                      125
<PAGE>
 
  "Related Party Tenant" means a tenant or subtenant of the Company which is
10% or more constructively or directly owned by an owner of 10% or more of the
Company under the Code.
 
  "Restricted Stock" means the shares of Common Stock acquired by holders in
redemption of OP Units which will constitute "restricted" securities as
defined by Rule 144.
 
  "REVPAR" means the revenue per available room of a Hotel Property as
determined by dividing room revenue (excluding food and beverage revenue) over
the applicable period by available rooms (i.e., the sum of the number of rooms
available to be rented at a Hotel Property on each day of the applicable
period).
 
  "Rule 144" means Rule 144 promulgated under the Securities Act.
 
  "Securities Act" means the Securities Act of 1933, as amended.
 
  "Stock" means Common Stock and Preferred Stock.
 
  "Subsidiary Corporation" means the Development and Management Company.
 
  "Tax Counsel" means Goodwin, Procter & Hoar LLP, tax counsel to the Company.
 
  "TIN" means taxpayer identification number.
 
  "Total Square Footage" means total net rentable square feet of the Office
and Industrial Properties, plus total square footage of the Hotel and Garage
Properties and structured parking related to the Office Properties.
 
  "Treasury Regulations" means regulations of the U.S. Department of Treasury
under the Code.
 
  "UBTI" means unrelated business taxable income as defined by Section 512(a)
of the Code and applicable Treasury Regulations.
 
  "Underwriters" means the U.S. Underwriters and the International Managers.
 
  "Unsecured Line of Credit" means the $300 million unsecured revolving line
of credit with BankBoston, N.A., as agent that expires in June 2000.
 
  "U.S. or United States" means the United States of America (including the
District of Columbia), its territories, possessions and other areas subject to
its jurisdiction.
 
  "U.S. Purchase Agreement" means the purchase agreement among the Company and
the U.S. Underwriters.
 
  "U.S. Representatives" means Goldman, Sachs & Co. and Merrill Lynch, Pierce,
Fenner & Smith Incorporated acting as representatives for the U.S.
Underwriters.
 
  "U.S. Stockholder" means a United States stockholder under the REIT
Requirements.
 
  "U.S. Underwriters" means the underwriters for the United States and Canada
named in this Prospectus for whom the U.S. Representatives are acting as
representatives.
 
  "White Paper" means the White Paper on Funds from Operations approved by the
Board of Governors of NAREIT in March 1995.
 
                                      126
<PAGE>
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Boston Properties, Inc.:
 Unaudited Pro Forma Condensed Consolidated Financial Information:
  Pro Forma Condensed Consolidated Balance Sheet as of September 30,
   1997...................................................................  F-2
  Notes to the Pro Forma Condensed Consolidated Balance Sheet.............  F-4
  Pro Forma Condensed Consolidated Statement of Income for the nine months
   ended September 30, 1997 and for the year ended December 31, 1996 .....  F-6
  Notes to the Pro Forma Condensed Consolidated Statement of Income.......  F-8
  Pro Forma Condensed Consolidated Statement of Income for the year ended
   December 31, 1996...................................................... F-12
  Notes to the Pro Forma Condensed Consolidated Statement of Income....... F-13
Boston Properties, Inc., and Boston Properties Predecessor Group:
  Report of Independent Accountants....................................... F-16
  Consolidated Balance Sheet as of September 30, 1997 (unaudited) and
   Combined Balance Sheets as of December 31, 1996 and 1995 .............. F-17
  Consolidated Statement of Operations for the period from June 23, 1997
   to September 30, 1997 (unaudited) and Combined Statements of Operations
   for the period from January 1, 1997 to June 22, 1997 (unaudited) and
   for the nine months ended September 30, 1996 (unaudited) and for the
   years ended December 31, 1996, 1995 and 1994 .......................... F-18
  Consolidated Statement of Stockholders' Equity for the period from June
   23, 1997 to September 30, 1997 (unaudited) and Combined Statements of
   Owners' Equity (Deficit) for the period from January 1, 1997 to June
   22, 1997 (unaudited) and for the years ended December 31, 1996, 1995
   and 1994 .............................................................. F-19
  Consolidated Statement of Cash Flows for the period from June 23, 1997
   to September 30, 1997 (unaudited) and Combined Statements of Cash Flows
   for the periods from January 1, 1997 to June 22, 1997 (unaudited), for
   the nine months ended September 30, 1996 (unaudited) and for the years
   ended December 31, 1996, 1995 and 1994................................. F-20
  Notes to Consolidated and Combined Financial Statements................. F-21
  Schedule III: Real Estate and Accumulated Depreciation as of December
   31, 1996............................................................... F-30
The following represents the properties acquired or to be acquired by the
 Company subsequent to the Initial Offering:
1997 Acquisitions:
 280 Park Avenue
  Report of Independent Accountants....................................... F-35
  Statement of Revenue over Certain Operating Expenses for the year ended
   December 31, 1996 and the period from January 1, 1997 to September 11,
   1997 (unaudited)....................................................... F-36
  Notes to Statement of Revenue over Certain Operating Expenses........... F-37
 100 East Pratt Street
  Report of Independent Accountants....................................... F-39
  Statement of Revenue over Certain Operating Expenses for the year ended
   December 31, 1996 and the nine months ended September 30, 1997
   (unaudited) ........................................................... F-40
  Notes to Statement of Revenue over Certain Operating Expenses........... F-41
 875 Third Avenue
  Report of Independent Accountants....................................... F-42
  Statement of Revenue over Certain Operating Expenses for the year ended
   December 31, 1996 and the nine months ended September 30, 1997
   (unaudited) ........................................................... F-43
  Notes to Statement of Revenue over Certain Operating Expenses........... F-44
1997 Pending Acquisition:
 Riverfront Plaza
  Report of Independent Accountants....................................... F-46
  Statement of Revenue over Certain Operating Expenses for the year ended
   December 31, 1996 and the nine months ended September 30, 1997
   (unaudited) ........................................................... F-47
  Notes to Statement of Revenue over Certain Operating Expenses........... F-48
</TABLE>
 
                                      F-1
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
 
                              SEPTEMBER 30, 1997
                                  (UNAUDITED)
 
  The following unaudited Pro Forma Condensed Consolidated Balance Sheet of
Boston Properties, Inc. (the "Company") is presented as if the following
transactions had been consummated on September 30, 1997; (i) properties
acquired or to be acquired subsequent to September 30, 1997 (the "1997
Acquired Properties" and "Pending Acquisition", collectively the "Acquisition
Properties"), and (ii) the completion of this offering (the "Offering"). This
Pro Forma Condensed Consolidated Balance Sheet should be read in conjunction
with the Pro Forma Condensed Consolidated Statement of Income of the Company
for the nine months ended September 30, 1997 and the year ended December 31,
1996 and the historical consolidated and combined financial statements and
notes thereto of the Company and the Boston Properties Predecessor Group (the
"Predecessor Group") included elsewhere in this Prospectus. In management's
opinion, all adjustments necessary to reflect the above transactions have been
made.
 
  The following Pro Forma Condensed Consolidated Balance Sheet is not
necessarily indicative of what the actual financial position would have been
assuming the above transactions had been consummated at September 30, 1997,
nor does it purport to represent the future financial position of the Company.
 
 The Properties
 
  The Company will own a portfolio of 83 commercial real estate properties
(the "Properties") aggregating approximately 16.4 million square feet, 72% of
which was developed or substantially redeveloped by the Company. The
properties consist of 70 office properties with approximately 11.8 million net
rentable square feet (including five office properties under development
containing approximately 1.0 million net rentable square feet) and
approximately 2.5 million additional square feet of structured parking for
6,913 vehicles, nine industrial properties with approximately 925,000 net
rentable square feet, three hotels with a total of 1,054 rooms (consisting of
approximately 940,000 square feet) (including one hotel currently under
development), and a parking garage with 1,170 spaces (consisting of
approximately 330,000 square feet). In addition, the Company will own, have
under contract or have an option to acquire six parcels of land totaling 39.0
acres, which will support approximately 629,000 square feet of development.
 
 The Offering
 
  The Company has filed a registration statement on Form S-11 with the
Securities and Exchange Commission with respect to the Offering of
approximately 14.0 million common shares at an estimated offering price of
$33.25 (excluding 2.1 million common shares that may be issued upon exercise
of the underwriters' overallotment option).
 
                                      F-2
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                 PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
 
                               SEPTEMBER 30, 1997
                                  (UNAUDITED)
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                            PRO FORMA ADJUSTMENTS
                            BOSTON     -----------------------------------
                          PROPERTIES,  ACQUISITION    OFFERING    OTHER
                             INC.      PROPERTIES       (A)    ADJUSTMENTS     PRO FORMA
                          -----------  -----------    -------- -----------     ----------
<S>                       <C>          <C>            <C>      <C>             <C>         
         ASSETS
Real estate and
 equipment..............  $1,433,376    $521,377(B)        --         --       $1,954,753
 Less: accumulated
  depreciation..........    (285,505)        --            --         --         (285,505)
                          ----------    --------      -------- ----------      ----------
 Total real estate and
  equipment.............   1,147,871     521,377           --         --        1,669,248
Cash ...................      25,989     (56,919)(C)  $441,061 $ (208,500)(C)     201,631
Escrows.................      10,673       2,631 (D)       --         --           13,304
Tenant and other
 receivables............      13,170         227 (E)       --         --           13,397
Accrued rental income...      50,377         --            --         --           50,377
Deferred charges........      34,707         --            --         --           34,707
Prepaid expenses and
 other assets...........       8,933         --            --         --            8,933
Investment in Joint
 Venture................       3,918         --            --         --            3,918
                          ----------    --------      -------- ----------      ----------
 Total assets...........  $1,295,638    $467,316      $441,061  $(208,500)     $1,995,515
                          ==========    ========      ======== ==========      ==========
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities:
 Mortgage notes
  payable...............  $  914,614    $301,800(F)        --         --       $1,216,414
 Unsecured Line of
  Credit................      71,000     137,500(F)        --   $(208,500)(F)         --
 Accounts payable and
  accrued expenses......      16,073         --            --         --           16,073
 Accrued interest
  payable...............       3,639         --            --         --            3,639
 Rent received in
  advance, security
  deposits and other
  liabilities...........      13,663         --            --         --           13,663
                          ----------    --------      -------- ----------      ----------
 Total liabilities......   1,018,989     439,300           --    (208,500)      1,249,789
                          ----------    --------      -------- ----------      ----------
Minority interest in
 Operating Partnership..      81,168      28,000(B)        --         --          109,168
                          ----------    --------      -------- ----------      ----------
Stockholders' equity:
 Preferred stock, $.01
  par value, 50,000,000
  shares authorized,
  none issued or
  outstanding...........         --          --            --         --              --
 Common stock, $.01 par
  value, 250,000,000
  shares authorized,
  38,693,541 issued and
  outstanding
  (historical) and
  52,694,041 shares
  issued and outstanding
  (pro forma)...........         387         --       $    140        --              527
 Additional paid in
  capital...............     172,315          16(B)    440,921        --          613,252
 Retained earnings......      22,779         --            --         --           22,779
                          ----------    --------      -------- ----------      ----------
 Total stockholders'
  equity................     195,481          16       441,061        --          636,558
                          ----------    --------      -------- ----------      ----------
 Total liabilities and
  stockholders' equity..  $1,295,638    $467,316      $441,061  $(208,500)     $1,995,515
                          ==========    ========      ======== ==========      ==========
</TABLE>
 
     The accompanying notes are an integral part of the pro forma condensed
                          consolidated balance sheet.
 
                                      F-3
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                                 NOTES TO THE
                PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
 
                   (DOLLARS IN THOUSANDS, EXCEPT SHARE DATA)
 
  NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET AS OF SEPTEMBER
30, 1997:
 
(A) Represents the net proceeds obtained from the issuance of 14.0 million
common shares in the Offering as follows:
 
<TABLE>
   <S>                                                                 <C>
   Gross proceeds from the Offering................................... $465,500
   Underwriters' discount and other offering expenses.................  (24,439)
                                                                       --------
   Net cash proceeds..................................................  441,061
   Par value of common shares(/1/)....................................     (140)
                                                                       --------
                                                                       $440,921
                                                                       ========
</TABLE>
- --------
(/1/Represents)the issuance of 14.0 million ($.01 par value per share) common
    shares in the Offering at an assumed offering price of $33.25 per share.
 
(B) Represents the purchase price, including closing costs, of the 1997
   Acquired Properties and the Pending Acquisition as follows:
 
<TABLE>
<CAPTION>
                                                                       PURCHASE
   1997 ACQUIRED PROPERTIES                                             PRICE
   ------------------------                                            --------
   <S>                                                                 <C>
   100 East Pratt Street (/1/)........................................ $137,516
   875 Third Avenue (/2/).............................................  209,500
</TABLE> 
<TABLE> 
<CAPTION>
   PENDING ACQUISITION
   -------------------
   <S>                                                                 <C>
   Riverfront Plaza (/3/).............................................  174,361
                                                                       --------
       Total Acquisition Properties................................... $521,377
                                                                       ========
</TABLE>
 
  --------
(/1/) The acquisition of 100 East Pratt Street was funded by a draw-down of
      $137,500 from the Unsecured Line of Credit and the issuance of 500 shares
      of common stock (valued at approximately $16, based on a value of $32.00
      per share).
(/2/) The acquisition of 875 Third Avenue was funded by the assumption of a
      $180,000 mortgage note, payment of $1,500 in cash and the issuance of
      890,869 Operating Partnership Units (the "OP Units"). To the extent that,
      for the ten trading days through and including December 31, 1998 the
      average daily closing price on the New York Stock Exchange of shares of
      common stock is less than $31.43 per share (such average, the "Share
      Average"), the Operating Partnership shall issue to the contributor of
      875 Third Avenue a number of additional OP Units (the "Additional OP
      Units") such that the product of (x) the Share Average, multiplied by (y)
      the sum of $890,869 plus the Additional OP Units, equals $28,000.
      Consequently, for accounting purposes, the OP Units were valued at
      approximately $28,000, based on a value of $31.43 per unit.
(/3/) The acquisition of Riverfront Plaza will be funded through the payment
      of $52,561 in cash and mortgage acquisition financing of $121,800.
 
(C) Represents the cash transactions as follows:
 
<TABLE>
   <S>                                                              <C>
   Net proceeds of the Offering described in Note (A) ............. $ 441,061
   Proceeds and working capital used for the Acquisition
    Properties.....................................................   (56,919)
   Paydown of Unsecured Line of Credit with proceeds from the
    Offering.......................................................  (208,500)
                                                                    ---------
   Net increase in cash............................................ $ 175,642
                                                                    =========
 
(D) Net increase reflects the following:
 
   Required escrow deposit for the debt assumed on
    the acquisition of 875 Third Avenue............................ $   2,631
                                                                    =========
</TABLE>
 
 
                                      F-4
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                        NOTES TO THE PRO FORMA CONDENSED
                    CONSOLIDATED BALANCE SHEET--(CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(E) Reflects tenant note receivable purchased in connection with the Pending
Acquisition of Riverfront Plaza.
(F) Represents the debt transactions as follows:
 
  MORTGAGE NOTES PAYABLE
<TABLE>
   <S>                                                                <C>
   Debt assumed in connection with the acquisition of 875 Third
    Avenue........................................................... $180,000
   Seller financing in connection with the acquisition of Riverfront
    Plaza............................................................  121,800
                                                                      --------
   Net increase in mortgage indebtedness............................. $301,800
                                                                      ========
</TABLE>
  UNSECURED LINE OF CREDIT
<TABLE>
   <S>                                                             <C>
   Draw-down from the Unsecured Line of Credit in connection with
    the acquisition of 100 East Pratt Street...................... $ 137,500
   Paydown of the Unsecured Line of Credit from proceeds of the
    Offering, net ................................................  (208,500)
                                                                   ---------
   Net decrease in Unsecured Line of Credit....................... $ (71,000)
                                                                   =========
</TABLE>
 
                                      F-5
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
             PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
 
 FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND FOR THE YEAR ENDED DECEMBER
                                   31, 1996
                                  (UNAUDITED)
 
  The following unaudited Pro Forma Condensed Consolidated Statement of Income
for the nine months ended September 30, 1997 and for the year ended December
31, 1996 is presented as if the following transactions had occurred on January
1, 1996; (i) the consummation of the initial public offering (the "Initial
Offering") and related Formation Transactions, and the Offering (ii) the
acquisition of the property acquired concurrent with the Initial Offering (the
"Initial Offering Acquisition Property"), (iii) the acquisition of properties
acquired subsequent to the Initial Offering (the "1997 Acquisitions"), (iv)
the acquisition of the pending acquisition (the "Pending Acquisition") and (v)
the closing of the mortgage financing.
 
  The Development and Management Company has been included in the pro forma
financial information under the equity method of accounting due to the
Operating Partnership's ownership of a noncontrolling, 1% voting interest.
 
  The operations of the hotel properties and the parking garages have been
included in the pro forma financial information pursuant to participating
lease agreements to be entered into in order for the Company to continue to
qualify as a REIT under IRC Section 856.
 
  This Pro Forma Condensed Consolidated Statement of Income should be read in
conjunction with the Pro Forma Condensed Consolidated Balance Sheet of the
Company and the historical consolidated and combined financial statements and
notes thereto of the Company and the Predecessor Company included elsewhere in
the Prospectus.
 
  The unaudited Pro Forma Condensed Consolidated Statement of Income is not
necessarily indicative of what the actual results of operations would have
been for the nine months ended September 30, 1997, or for the year ended
December 31, 1996, had the previously described transactions actually occurred
on January 1, 1996 and the effect thereof carried forward through the nine
month period ended September 30, 1997, nor do they purport to present the
future results of operations of the Company.
 
                                      F-6
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
              PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
 
                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997
                                  (UNAUDITED)
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                              BOSTON
                                            PROPERTIES
                                            PREDECESSOR
                                               GROUP                        PRO FORMA ADJUSTMENTS
                    BOSTON PROPERTIES, INC. JANUARY 1,  --------------------------------------------------------------
                         JUNE 23, 1997          1997                   INITIAL
                              TO                TO                    OFFERING
                         SEPTEMBER 30,       JUNE 22,    FORMATION   ACQUISITION      1997       PENDING      OTHER
                             1997              1997     TRANSACTIONS  PROPERTY    ACQUISITIONS ACQUISITION ADJUSTMENTS
                    ----------------------- ----------- ------------ -----------  ------------ ----------- -----------
                                                            (A)          (B)          (C)          (C)
<S>                 <C>                     <C>         <C>          <C>          <C>          <C>         <C>
Revenue:
 Rental:
 Base rent........          $57,892           $80,122     $  9,396     $1,498       $54,440      $13,412         --
 Recoveries from
 tenants..........            6,144            10,283          --         101         7,639        2,017         --
 Parking and
 other............              217             3,397       (1,061)       --            347          382         --
                            -------           -------     --------     ------       -------      -------    --------
  Total rental
  revenue.........           64,253            93,802        8,335      1,599        62,426       15,811         --
 Hotel............              --             31,185      (31,185)       --            --           --          --
 Development and
 management
 services.........            2,221             3,685         (452)       --            --           --          --
 Interest and
 other............            1,879             1,146         (352)       --            --           --     $(1,200) (D)
                            -------           -------     --------     ------       -------      -------    --------
  Total revenue...           68,353           129,818      (23,654)     1,599        62,426       15,811     (1,200)
                            -------           -------     --------     ------       -------      -------    --------
Expenses:
Rental:
 Operating........            8,828            13,650         (353)       437        14,580        2,761         --
 Real estate
 taxes............            9,065            13,382        1,345        172        13,049        1,219         --
 Hotel:
 Operating........              --             20,938      (20,938)       --            --           --          --
 Real estate tax-
 es...............              --              1,514       (1,514)       --            --           --          --
 General and
 administrative...            3,164             5,116          391        --            --           --          425 (E)
 Interest.........           16,091            53,324      (28,151)       --         11,813          --       16,839 (F)
 Depreciation and
 amortization.....           10,113            17,054          124        210(G)      7,646        2,288         --
                            -------           -------     --------     ------       -------      -------    --------
  Total expenses..           47,261           124,978      (49,096)       819        47,088        6,268      17,264
                            -------           -------     --------     ------       -------      -------    --------
Income before
minority interests
 ..................           21,092             4,840       25,442        780        15,338        9,543     (18,464)
Minority interest
in property
partnership.......              (69)             (235)         --         --            --           --          --
                            -------           -------     --------     ------       -------      -------    --------
Income before
minority interest
in Operating
Partnership ......           21,023             4,605       25,442        780        15,338        9,543     (18,464)
Minority interest
in Operating
Partnership.......           (6,169)              --           --         --            --           --       (8,019)(H)
                            -------           -------     --------     ------       -------      -------    --------
Income before
extraordinary
item..............          $14,854           $ 4,605     $ 25,442     $  780       $15,338      $ 9,543    $(26,483)
                            =======           =======     ========     ======       =======      =======    ========
Income before ex-
traordinary item
per common share..          $   .38
                            =======
Weighted average
number of common
shares outstand-
ing...............           38,694
                            =======
<CAPTION>
                      PRO
                     FORMA
                    ---------
<S>                 <C>
Revenue:
 Rental:
 Base rent........  $216,760
 Recoveries from
 tenants..........    26,184
 Parking and
 other............     3,282
                    ---------
  Total rental
  revenue.........   246,226
 Hotel............       --
 Development and
 management
 services.........     5,454
 Interest and
 other............     1,473
                    ---------
  Total revenue...   253,153
                    ---------
Expenses:
Rental:
 Operating........    39,903
 Real estate
 taxes............    38,232
 Hotel:
 Operating........       --
 Real estate tax-
 es...............       --
 General and
 administrative...     9,096
 Interest.........    69,916
 Depreciation and
 amortization.....    37,435
                    ---------
  Total expenses..   194,582
                    ---------
Income before
minority interests
 ..................    58,571
Minority interest
in property
partnership.......      (304)
                    ---------
Income before
minority interest
in Operating
Partnership ......    58,267
Minority interest
in Operating
Partnership.......   (14,188)
                    ---------
Income before
extraordinary
item..............  $ 44,079
                    =========
Income before ex-
traordinary item
per common share..  $    .84
                    =========
Weighted average
number of common
shares outstand-
ing...............    52,694
                    =========
</TABLE>
     The accompanying notes are an integral part of the pro forma condensed
                       consolidated statement of income.
 
                                      F-7
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                                 NOTES TO THE
             PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
 
                            (DOLLARS IN THOUSANDS)
 
NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME FOR THE NINE
MONTHS ENDED SEPTEMBER 30, 1997
 
A. Reflects the pro forma Formation Transactions adjustment summary for the
period from January 1, 1997 to June 22, 1997 (the "Predecessor Period").
 
<TABLE>
<CAPTION>
                      RENT                                                                       HOTEL
                     HOTELS                           INTEREST PROPERTY   PROPERTY     HOTEL     REAL    GENERAL
PRO FORMA             AND   PARKING   HOTEL    MGMT     AND    OPERATING REAL ESTATE OPERATING  ESTATE      &    INTEREST
ADJUSTMENTS          GARAGE INCOME   REVENUE   FEES    OTHER   EXPENSES     TAXES    EXPENSES    TAXES    ADMIN  EXPENSE
- -----------          ------ -------  --------  -----  -------- --------- ----------- ---------  -------  ------- --------
<S>                  <C>    <C>      <C>       <C>    <C>      <C>       <C>         <C>        <C>      <C>     <C>
(1)Assignment of
   contracts.....                              $(452)                                                     $(430)
(2)Equity
   investment
   income........                                        $21
(3)Operation of
   hotels and
   garage........           $(1,061) $(31,185)                   $(353)    $1,345    $(20,938)  $(1,514)
(4)Rental of
   hotels and
   garage........    $9,396
(5)General and
   administrative..                                                                                         821
(6)Amortization
   of deferred
   financing
   costs.........                                                                                                $   (189)
(7)Release of
   restricted
   cash..........                                       (373)
(8)Depreciation
   expense.......
(9)Mortgage
   interest......                                                                                                 (27,962)
                     ------ -------  --------  -----   -----     -----     ------    --------   -------   -----  --------
 Pro Forma
 Formation
 Transactions
 adjustment
 summary total...    $9,396 $(1,061) $(31,185) $(452)  $(352)    $(353)    $1,345    $(20,938)  $(1,514)  $ 391  $(28,151)
                     ====== =======  ========  =====   =====     =====     ======    ========   =======   =====  ========
<CAPTION>
PRO FORMA            DEPRECIATION
ADJUSTMENTS            EXPENSE
- -----------          ------------
<S>                  <C>
(1)Assignment of
   contracts.....
(2)Equity
   investment
   income........
(3)Operation of
   hotels and
   garage........
(4)Rental of
   hotels and
   garage........
(5)General and
   administrative..
(6)Amortization
   of deferred
   financing
   costs.........
(7)Release of
   restricted
   cash..........
(8)Depreciation
   expense.......        $124
(9)Mortgage
   interest......
                     ------------
 Pro Forma
 Formation
 Transactions
 adjustment
 summary total...        $124
                     ============
</TABLE>
 
  (1) In connection with the Formation Transactions, certain third-party
      management contracts were assigned to the Development and Management
      Company. As a result of the assignment, operating income, expenses and
      overhead attributable to the contracts were reflected in the operations
      of the Development and Management Company as detailed below:
 
<TABLE>
     <S>                                                                  <C>
     Management services................................................  $ 452
     General and administrative expenses................................   (430)
                                                                          -----
      Manager contract income...........................................  $  22
                                                                          =====
</TABLE>
 
  (2) The Operating Partnership holds a 95% economic interest in the
      Development and Management Company and records an equity interest of $21
      on the $22 net income.
  (3) In connection with the Formation Transactions, the Operating Partnership
      entered into participating leases for the operation of the hotels and
      parking garage. As a result of these agreements, revenue and expenses
      will not be reflected from the operation of these businesses.
  (4) Represents rental income from the leasing of the hotels and parking
      garage owned by the Operating Partnership. The hotel lease arrangements
      are with an affiliate.
  (5) Reflects an increase of $821 in general and administrative expenses as a
      result of operating as a public company.
  (6) Reflects the net increase of $290 in the amortization of deferred
      financing costs for the $1,800 fee and related professional costs on the
      Unsecured Line of Credit, less a net reduction of $479 in amortization of
      deferred financing costs related to debt paid off with the Initial
      Offering proceeds.
 
                                      F-8
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME--(CONTINUED)
 
                            (DOLLARS IN THOUSANDS)
 
  (7) Reflects the decrease in interest income as a result of the release of
      cash previously required to be held in escrow per the terms of the
      various mortgage note payable agreements.
  (8) Reflects the increase in depreciation from depreciating over 40 years
      the pro forma increase to real estate from the purchase of limited
      partners' interests and transfer costs paid.
  (9) Reflects the repayment of a portion of the existing mortgage
      indebtedness from proceeds of the Initial Offering for the Predecessor
      Period:
 
<TABLE>
<CAPTION>
                                                    PRINCIPAL INTEREST
      PROPERTIES                                     AMOUNT     RATE   INTEREST
      ----------                                    --------- -------- --------
   <S>                                              <C>       <C>      <C>
   599 Lexington Avenue...........................  $225,000   7.00%   $  7,547
   Two Independence Square........................   122,505   7.90%      4,637
   One Independence Square........................    78,327   7.90%      2,965
   2300 N Street..................................    66,000   7.00%      2,214
   Capital Gallery................................    60,559   8.24%      2,391
   Ten Cambridge Center...........................    25,000   7.57%        907
   191 Spring Street..............................    23,883   8.50%        973
   Bedford Business Park..........................    23,376   8.50%        952
   10 & 20 Burlington Mall Road...................    16,621   8.33%        663
   Cambridge Center North Garage..................    15,000   7.57%        544
   91 Hartwell Avenue.............................    11,322   8.33%        452
   92 & 100 Hayden Avenue.........................     9,057   8.33%        362
   Montvale Center................................     7,969   8.59%        328
   Newport Office Park............................     6,874   8.13%        268
   Hilltop Business Center........................     4,750   7.00%        159
                                                                       --------
    Total.........................................                       25,362
   Historical interest expense - Predecessor Peri-
    od............................................                      (53,324)
                                                                       --------
   Pro forma interest expense adjustment for the
    Predecessor Period............................                     $(27,962)
                                                                       ========
</TABLE>
 
B. Reflects the results of operations, as adjusted for depreciation, of the
   Newport Office Park, acquired concurrent with the Initial Offering, for the
   period from January 1, 1997 to June 22, 1997 (the acquisition date).
 
                                      F-9
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                       NOTES TO THE PRO FORMA CONDENSED
                 CONSOLIDATED STATEMENT OF INCOME--(CONTINUED)
 
                            (DOLLARS IN THOUSANDS)
 
 
C. Reflects the historical results of operations, as adjusted for base rent
   and depreciation, for the 1997 Acquisitions and Pending Acquisition for the
   nine months ended September 30, 1997 as follows:
 
1997 ACQUISITIONS
 
<TABLE>
<CAPTION>
                                      280 PARK  100 EAST PRATT 875 THIRD
                                      AVENUE(1)     STREET      AVENUE    TOTAL
                                      --------- -------------- --------- -------
<S>                                   <C>       <C>            <C>       <C>
Revenue:
  Base rent..........................  $17,012     $10,924      $18,646  $46,582
  Adjustment(2)......................    7,437         397           24    7,858
                                       -------     -------      -------  -------
    Total base rent..................   24,449      11,321       18,670   54,440
  Recoveries from tenants............    1,707       2,133        3,799    7,639
  Other..............................       80         267          --       347
                                       -------     -------      -------  -------
    Total rental revenue.............   26,236      13,721       22,469   62,426
                                       -------     -------      -------  -------
Expenses:
  Operating..........................    7,772       3,453        3,355   14,580
  Real estate taxes..................    6,677       1,541        4,831   13,049
  Interest...........................      --          --        11,813   11,813
  Depreciation(Note G)...............    3,355       1,934        2,357    7,646
                                       -------     -------      -------  -------
    Total expenses...................   17,804       6,928       22,356   47,088
                                       -------     -------      -------  -------
  Net income.........................  $ 8,432     $ 6,793      $   113  $15,338
                                       =======     =======      =======  =======
</TABLE>
- --------
(1) Reflects the results of operations for the period from January 1, 1997
    through September 11, 1997 (the acquisition date).
(2) Represents an adjustment to straight-line rent based on the pro forma
    acquisition date of January 1, 1996 and also includes an adjustment for
    rental income from Banker's Trust during the period they occupied 280 Park
    Avenue as owner/occupant of the building (the rental figure is based upon
    the lease entered into by Banker's Trust concurrent with the sale of the
    building to the Company on September 11, 1997).
 
PENDING ACQUISITION
 
<TABLE>
<CAPTION>
                                                                      RIVERFRONT
                                                                        PLAZA
                                                                      ----------
<S>                                                                   <C>
Revenue:
  Base rent..........................................................  $13,023
  Adjustment(1)......................................................      389
                                                                       -------
    Total base rent..................................................   13,412
  Recoveries from tenants............................................    2,017
  Other..............................................................      382
                                                                       -------
    Total rental revenue.............................................   15,811
                                                                       -------
Expenses:
  Operating..........................................................    2,761
  Real estate taxes..................................................    1,219
  Interest...........................................................      --
  Depreciation(Note G)...............................................    2,288
                                                                       -------
    Total expenses...................................................    6,268
                                                                       -------
  Net income.........................................................  $ 9,543
                                                                       =======
</TABLE>
- --------
(1) Represents an adjustment to straight-line rent based on the pro forma
    acquisition date of January 1, 1996.
 
                                     F-10
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                       NOTES TO THE PRO FORMA CONDENSED
                 CONSOLIDATED STATEMENT OF INCOME--(CONTINUED)
 
                            (DOLLARS IN THOUSANDS)
 
 
D. Reflects reduction in interest income as a result of cash used for the
acquisition of 280 Park Avenue.
 
E. Reflects the incremental increase in general and administrative costs
related to the 1997 Acquisitions and Pending Acquisition.
 
F. Reflects the net increase in interest as a result of the following debt
transactions:
 
     Payoff of the Unsecured Line of Credit with proceeds from
       the Offering for the period sub-sequent to the Initial 
       Offering, net of amounts capitalized......................... $  (411)
     Acquisition mortgage financing of 280 Park Avenue in the 
       original principal amount of $220 million computed at an
       interest rate of 7% for period January 1, 1997 to
       September 11, 1997 (date of acquisition).....................  10,675
     Amortization of deferred financing fees for the period from 
       January 1, 1997 to September 1, 1997 (date of acquisition)
       as a result of approximately $1.1 million of fees associated
       with the mortgage financing of 280 Park Avenue. The deferred
       financing fees are amortized over the five year term of the
       loan ........................................................     153
     Seller financing of Riverfront Plaza in the principal amount
       of $121,800 computed at the 10 year U.S. Treasury Note rate
       (5.88% at November 17, 1997) plus 1.15% .....................   6,422
                                                                     -------
     Increase in interest expense for the period subsequent to
       the Initial Offering......................................... $16,839
                                                                     =======
 
G. Detail of pro forma depreciation expense is presented below for the Initial
Offering Acquisition Property, the 1997 Acquisitions and the Pending
Acquisition:
 
<TABLE>
<CAPTION>
                                                          ESTIMATED
                                                 PURCHASE  LIFE OF   PRO FORMA
PROPERTY(IES)                                     PRICE    ASSETS   DEPRECIATION
- -------------                                    -------- --------- ------------
<S>                                              <C>      <C>       <C>
INITIAL OFFERING ACQUISITION PROPERTY
Newport Office Park(1).......................... $21,700      40       $  210
                                                                       ======
1997 ACQUISITIONS
280 Park Avenue(1).............................. 322,650      40       $3,355
100 East Pratt Street........................... 137,500      40        1,934
875 Third Avenue................................ 209,500      40        2,357
                                                                       ------
                                                                       $7,646
                                                                       ======
PENDING ACQUISITION
Riverfront Plaza................................ 174,361      40       $2,288
                                                                       ======
</TABLE>
- --------
(1) Reflects pro forma depreciation expense for the periods prior to
    acquisition.
 
H. Adjustment to minority interest to reflect the minority investors interest
in the Operating Partnership of approximately 24.35% following the Offering
and issuance of OP Units and common shares.
 
                                     F-11
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
              PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
 
                      FOR THE YEAR ENDED DECEMBER 31, 1996
                                  (UNAUDITED)
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                              PRO FORMA ADJUSTMENTS
                            BOSTON    -----------------------------------------------------------------------
                          PROPERTIES                     INITIAL
                          PREDECESSOR  FORMATION         OFFERING           1997        PENDING      OTHER         PRO
                             GROUP    TRANSACTIONS ACQUISITION PROPERTY ACQUISITIONS  ACQUISITION ADJUSTMENTS     FORMA
                          ----------- ------------ -------------------- ------------  ----------- -----------    --------
                                          (A)              (B)              (C)           (C)
<S>                       <C>         <C>          <C>                  <C>           <C>         <C>            <C>
Revenue:
 Rental:
 Base rent..............   $169,420     $22,371           $2,908          $66,637       $16,420         --       $277,756
 Recoveries from
 tenants................     22,607         --               180           11,379         2,976         --         37,142
 Parking and other......      2,979      (2,043)             --               412           436         --          1,784
                           --------     -------           ------          -------       -------    --------      --------
  Total rental revenue..    195,006      20,328            3,088           78,428        19,832         --        316,682
 Hotel..................     65,678     (65,678)             --               --            --          --            --
 Development and
 management services....      5,719        (936)             --               --            --          --          4,783
 Interest and other.....      3,530        (705)             --               --            --          --          2,825
                           --------     -------           ------          -------       -------    --------      --------
  Total revenue.........    269,933     (46,991)           3,088           78,428        19,832         --        324,290
                           --------     -------           ------          -------       -------    --------      --------
Expenses:
Rental:
 Operating..............     29,823        (713)             879           18,751         3,865         --         52,605
 Real estate taxes......     28,372       2,754              347           18,327         1,638         --         51,438
 Hotel:
 Operating..............     43,634     (43,634)             --               --            --          --            --
 Real estate taxes......      3,100      (3,100)             --               --            --          --            --
 General and
 administrative.........     10,754         834              --               --            --     $    300(D)     11,888
 Interest...............    109,394     (54,398)             --            15,750           --       24,183(E)     94,929
 Depreciation and
 amortization...........     36,199         257              434           10,561(F)      3,051         --         50,502
                           --------     -------           ------          -------       -------    --------      --------
  Total expenses........    261,276     (98,000)           1,660           63,389         8,554      24,483       261,362
                           --------     -------           ------          -------       -------    --------      --------
Income before minority
interests ..............      8,657      51,009            1,428           15,039        11,278     (24,483)       62,928
Minority interest in
property partnership....       (384)        --               --               --            --          --           (384)
                           --------     -------           ------          -------       -------    --------      --------
Income before minority
interest in Operating
Partnership ............      8,273      51,009            1,428           15,039        11,278     (24,483)       62,544
Minority interest in
Operating Partnership...        --          --               --               --            --      (15,229)(G)   (15,229)
                           --------     -------           ------          -------       -------    --------      --------
Net income..............   $  8,273     $51,009           $1,428          $15,039       $11,278    $(39,712)     $ 47,315
                           ========     =======           ======          =======       =======    ========      ========
Net income per common
share...................                                                                                         $    .90
                                                                                                                 ========
Weighted average number
of common shares
outstanding.............                                                                                           52,694
                                                                                                                 ========
</TABLE>
 
     The accompanying notes are an integral part of the pro forma condensed
                       consolidated statement of income.
 
                                      F-12
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                       NOTES TO THE PRO FORMA CONDENSED
                       CONSOLIDATED STATEMENT OF INCOME
 
                            (DOLLARS IN THOUSANDS)
 
NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME FOR THE YEAR
ENDED DECEMBER 31, 1996
 
A. Reflects the pro forma Formation Transactions adjustment summary for the
year ended December 31, 1996
 
<TABLE>
<CAPTION>
                      RENT                                                                        HOTEL
                     HOTELS                            INTEREST PROPERTY   PROPERTY     HOTEL      REAL
PRO FORMA              AND   PARKING   HOTEL    MGMT     AND    OPERATING REAL ESTATE OPERATING   ESTATE   GENERAL & INTEREST
ADJUSTMENTS          GARAGE  INCOME   REVENUE   FEES    OTHER   EXPENSES     TAXES    EXPENSES    TAXES      ADMIN   EXPENSE
- -----------          ------  -------  --------  -----  -------- --------- ----------- ---------  --------  --------- --------
<S>                  <C>     <C>      <C>       <C>    <C>      <C>       <C>         <C>        <C>       <C>       <C>
(1) Assignment of
   contracts.......                             $(936)                                                      $ (866)
(2)Equity
   investment
   income..........                                       $66
(3)Operation of
   hotels and
   garage..........          $(2,043) $(65,678)                   $(713)    $2,754    $(43,634)  $ (3,100)
(4)Rental of hotels
   and garage......  $22,371
(5)General and
   administrative..                                                                                          1,700
(6)Amortization of
   deferred
   financing
   costs...........                                                                                                  $   (731)
(7)Release of
   restricted
   cash............                                      (771)
(8)Depreciation
   expense.........
(9)Mortgage
   interest........                                                                                                   (53,667)
                     ------- -------  --------  -----   -----     -----     ------    --------   --------   ------   --------
   Pro forma
   formation
   transactions
   adjustment
   summary total...  $22,371 $(2,043) $(65,678) $(936)  $(705)    $(713)    $2,754    $(43,634)  $(3,100)   $  834   $(54,398)
                     ======= =======  ========  =====   =====     =====     ======    ========   ========   ======   ========
<CAPTION>
                     DEPREC-
PRO FORMA            IATION
ADJUSTMENTS          EXPENSE
- -----------          -------
<S>                  <C>
(1) Assignment of
   contracts.......
(2)Equity
   investment
   income..........
(3)Operation of
   hotels and
   garage..........
(4)Rental of hotels
   and garage......
(5)General and
   administrative..
(6)Amortization of
   deferred
   financing
   costs...........
(7)Release of
   restricted
   cash............
(8)Depreciation
   expense.........   $257
(9)Mortgage
   interest........
                     -------
   Pro forma
   formation
   transactions
   adjustment
   summary total...   $257
                     =======
</TABLE>
- ----
  (1) In connection with the Formation Transactions, certain third-party
      management contracts are assigned to the Development and Management
      Company. As a result of the assignment, current operating income,
      expenses and overhead attributable to the contracts are reflected in the
      operations of the Development and Management Company as detailed below:
 
<TABLE>
    <S>                                                                    <C>
    Management services..................................................  $936
    General and administrative expenses..................................  (866)
                                                                           ----
     Manager contract income.............................................  $ 70
                                                                           ====
</TABLE>
 
  (2) The Operating Partnership holds a 95% economic interest in the
      Development and Management Company and records an equity interest of $66
      on the $70 net income.
 
  (3) In connection with the Formation Transactions, the Operating Partnership
      entered into participating leases for the operation of the hotels and
      parking garage. As a result of these agreements, revenue and expenses are
      not reflected from the operation of these businesses.
 
  (4) Represents rental income from the leasing of the hotels and parking
      garage owned by the Operating Partnership. The hotel lease arrangements
      are with an affiliate.
 
  (5) Reflects an increase of $1,700 in general and administrative expenses as
      a result of operating as a public company.
 
  (6) Reflects the net increase of $600 in the amortization of deferred
      financing costs for the $1,800 fee and related professional costs on the
      Unsecured Line of Credit, less a net reduction of $1,331 in amortization
      of deferred financing costs related to debt paid off with the Initial
      Offering proceeds.
 
  (7) Reflects the decrease in interest income as a result of the release of
      cash previously required to be held in escrow per the terms of the
      various mortgage note payable agreements.
 
  (8) Reflects the increase in depreciation from depreciating over 40 years the
      pro forma increase to real estate from the purchase of limited partners'
      interests and transfer costs paid.
 
                                      F-13
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                       NOTES TO THE PRO FORMA CONDENSED
                 CONSOLIDATED STATEMENT OF INCOME--(CONTINUED)
 
                            (DOLLARS IN THOUSANDS)
 
  (9) Reflects the repayment of a portion of the existing mortgage
      indebtedness from proceeds of the Initial Offering and the corresponding
      adjustment to interest expense incurred in 1996.
 
<TABLE>
<CAPTION>
                                                PRINCIPAL INTEREST
                   PROPERTY(IES)                 AMOUNT     RATE   INTEREST
                   -------------                --------- -------- ---------
     <S>                                        <C>       <C>      <C>
       599 Lexington Avenue...................  $225,000    7.00%  $  15,750(1)
       Two Independence Square................   122,855    7.90%      9,813
       One Independence Square................    78,700    7.90%      6,276
       2300 N Street..........................    66,000    7.00%      4,620(1)
       Capital Gallery........................    60,751    8.24%      5,761
       Ten Cambridge Center...................    25,000    7.57%      1,924
       191 Spring Street......................    23,942    8.50%      1,697
       Bedford Business Park..................    23,500    8.50%      1,998(1)
       10 & 20 Burlington Mall Road...........    16,621    8.33%      1,385
       Cambridge Center North Garage..........    15,000    7.57%      1,183
       91 Hartwell Avenue.....................    11,322    8.33%        943
       92 & 100 Hayden Avenue.................     9,057    8.33%        754
       Montvale Center........................     7,992    8.59%        474
       Newport Office Park....................     6,874    8.13%        558
       Hilltop Business Center................     4,817    7.00%        318
                                                                   ---------
       Pro forma totals.......................                        53,454
       Historical interest expense for the
        year ended December 31, 1996..........                      (107,121)
                                                                   ---------
       Pro forma interest expense adjustment..                     $ (53,667)
                                                                   =========
</TABLE>
- --------
    (1) The interest expense used in this calculation assumes the mortgage
        loan was outstanding during all of 1996.
 
B. Reflects the historical results of operations, as adjusted for
depreciation, for Newport Office Park, acquired concurrent with the Initial
Offering for the year ended December 31, 1996.
 
C. Reflects the historical results of operations, as adjusted for base rent
and depreciation, for the 1997 Acquisitions and Pending Acquisition for the
year ended December 31, 1996 as follows:
 
1997 ACQUISITIONS
 
<TABLE>
<CAPTION>
                                       280 PARK 100 EAST PRATT 875 THIRD
                                        AVENUE      STREET      AVENUE    TOTAL
                                       -------- -------------- --------- -------
<S>                                    <C>      <C>            <C>       <C>
Revenue:
  Base rent........................... $16,786     $14,046      $25,255  $56,087
  Adjustment(1).......................   9,991         528           31   10,550
                                       -------     -------      -------  -------
    Total base rent...................  26,777      14,574       25,286   66,637
  Recoveries from tenants.............   2,600       2,966        5,813   11,379
  Other...............................      59         353          --       412
                                       -------     -------      -------  -------
    Total rental revenue..............  29,436      17,893       31,099   78,428
                                       -------     -------      -------  -------
Expenses:
  Operating...........................  10,169       4,333        4,249   18,751
  Real estate taxes...................   9,908       2,054        6,365   18,327
  Interest............................     --          --        15,750   15,750
  Depreciation(Note F)................   4,840       2,578        3,143   10,561
                                       -------     -------      -------  -------
    Total expenses....................  24,917       8,965       29,507   63,389
                                       -------     -------      -------  -------
  Net income.......................... $ 4,519     $ 8,928      $ 1,592  $15,039
                                       =======     =======      =======  =======
</TABLE>
- --------
(1) Represents an adjustment to straight-line rent based on the pro forma
    acquisition date of January 1, 1996 and also includes an adjustment for
    rental income from Banker's Trust during the period they occupied 280 Park
    Avenue as owner/occupant of the building (the rental figure is based upon
    the lease entered into by Banker's Trust concurrent with the sale of the
    building to the Company on September 11, 1997).
 
                                     F-14
<PAGE>
 
                            BOSTON PROPERTIES, INC.
 
                       NOTES TO THE PRO FORMA CONDENSED
                 CONSOLIDATED STATEMENT OF INCOME--(CONTINUED)
 
                            (DOLLARS IN THOUSANDS)
 
 
PENDING ACQUISITION
 
<TABLE>
<CAPTION>
                                                                      RIVERFRONT
                                                                        PLAZA
                                                                      ----------
<S>                                                                   <C>
Revenue:
  Base rent..........................................................  $15,898
  Adjustment(1)......................................................      522
                                                                       -------
    Total base rent..................................................   16,420
  Recoveries from tenants............................................    2,976
  Other..............................................................      436
                                                                       -------
    Total rental revenue.............................................   19,832
                                                                       -------
Expenses:
  Operating..........................................................    3,865
  Real estate taxes..................................................    1,638
  Interest...........................................................      --
  Depreciation(Note F)...............................................    3,051
                                                                       -------
    Total expenses...................................................    8,554
                                                                       -------
  Net income.........................................................  $11,278
                                                                       =======
</TABLE>
- --------
(1) Represents an adjustment to straight-line rent based on the pro forma
    acquisition date of January 1, 1996.
 
D. Reflects the incremental increase in general and administrative costs
related to the 1997 Acquisitions and Pending Acquisition.
 
E. Reflects the net increase in interest expense as a result of the following
debt transactions:
 
     Acquisition mortgage financing of 280 Park Avenue in the original
       principal amount of $220 million computed at an interest rate
       of 7.0% for the year ended December 31, 1996.................... $15,400
     Amortization of deferred financing fees as a result of 
       approximately $1.1 million of fees associated with the mortgage
       financing of 280 Park Avenue. The deferred financing fees are
       amortized over the five year term of the loan ..................     220
     Seller financing of Riverfront Plaza in the principal amount of
       $121,800 computed at the 10 year U.S. Treasury Note rate
       (5.88% at November 17, 1997) plus 1.15%.........................   8,563
                                                                        -------
     Increase in interest expense...................................... $24,183
                                                                        =======

- --------
F. Detail of pro forma depreciation expense is presented below for the
   Acquisition at Initial Offering, the 1997 Acquisitions and the Pending
   Acquisition:
 
<TABLE>
<CAPTION>
                                                          ESTIMATED
                                                 PURCHASE  LIFE OF   PRO FORMA
PROPERTY(IES)                                     PRICE    ASSETS   DEPRECIATION
- -------------                                    -------- --------- ------------
<S>                                              <C>      <C>       <C>
INITIAL OFFERING ACQUISITION PROPERTY
Newport Office Park............................. $ 21,700     40      $   434
                                                                      =======
1997 ACQUISITIONS
280 Park Avenue.................................  322,650     40      $ 4,840
100 East Pratt Street...........................  137,500     40        2,578
875 Third Avenue................................  209,500     40        3,143
                                                                      -------
                                                                      $10,561
                                                                      =======
PENDING ACQUISITION
Riverfront Plaza................................  174,361     40      $ 3,051
                                                                      =======
</TABLE>
 
G. Adjustment to minority interest to reflect the minority investors interest
in the Operating Partnership of approximately 24.35% following the Offering
and issuance of OP Units and common shares.
 
                                     F-15
<PAGE>
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Partners and Owners of Boston Properties Predecessor Group
 
  We have audited the accompanying combined balance sheets of the Boston
Properties Predecessor Group as of December 31, 1996 and 1995, and the related
combined statements of operations, owners' equity (deficit), and cash flows
for each of the three years in the period ended December 31, 1996 and the
financial statement schedule included on the index at F-1 of this Prospectus.
These combined financial statements and financial statement schedule are the
responsibility of the management of the Boston Properties Predecessor Group.
Our responsibility is to express an opinion on these combined financial
statements and financial statement 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 combined financial statements
are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the combined
financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall combined financial statement presentation. We believe
that our audits provide a reasonable basis for our opinion.
 
  In our opinion, the combined financial statements referred to above present
fairly, in all material respects, the combined financial position of the
Boston Properties Predecessor Group as of December 31, 1996 and 1995, and the
combined results of their operations and their cash flows for each of the
three years in the period ended December 31, 1996, in conformity with
generally accepted accounting principles. In addition, in our opinion, the
financial statement schedule referred to above, when considered in relation to
the basic combined financial statements taken as a whole, presents fairly, in
all material respects, the information required to be set forth therein.
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
May 1, 1997
 
                                     F-16
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
                    CONSOLIDATED AND COMBINED BALANCE SHEETS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                         THE PREDECESSOR GROUP
                                            THE COMPANY      DECEMBER 31,
                                           SEPTEMBER 30, ----------------------
                                               1997         1996        1995
                                           ------------- ----------  ----------
                                            (UNAUDITED)
<S>                                        <C>           <C>         <C>
                 ASSETS
Real estate and equipment:
  Land and land improvements.............   $  298,818   $  169,424  $  169,721
  Buildings and improvements.............      937,717      702,720     698,053
  Tenant improvements....................      116,255      107,808     101,701
  Furniture, fixtures and equipment......       32,633       34,034      32,831
  Development and construction in proc-
   ess...................................       47,953       21,585      10,018
                                            ----------   ----------  ----------
                                             1,433,376    1,035,571   1,012,324
  Less: accumulated depreciation.........     (285,505)    (263,911)   (238,514)
                                            ----------   ----------  ----------
    Total real estate and equipment......    1,147,871      771,660     773,810
Cash and cash equivalents................       25,989        8,998      25,867
Escrows..................................       10,673       25,474      27,716
Tenant and other receivables.............       13,170       12,049      14,362
Accrued rental income....................       50,377       49,206      49,681
Deferred costs net of accumulated amorti-
 zation of $38,504, $52,627 and $46,819
 at September 30, 1997, and December 31,
 1996 and 1995, respectively.............       34,707       24,722      22,829
Prepaid expenses and other assets........        8,933        4,402       8,521
Investment in Joint Venture..............        3,918          --          --
                                            ----------   ----------  ----------
    Total assets.........................   $1,295,638   $  896,511  $  922,786
                                            ==========   ==========  ==========
LIABILITIES AND STOCKHOLDERS' AND OWNERS'
             EQUITY (DEFICIT)
Liabilities:
  Mortgage notes payable.................     $914,614   $1,420,359  $1,396,141
  Unsecured line of credit...............       71,000          --          --
  Notes payable--affiliates..............          --        22,117       5,267
  Accounts payable and accrued expenses..       16,073       13,795      14,367
  Accrued interest payable...............        3,639        9,667       9,088
  Rents received in advance, security de-
   posits and other liabilities..........       13,663        7,205       4,576
                                            ----------   ----------  ----------
    Total liabilities....................    1,018,989    1,473,143   1,429,439
                                            ----------   ----------  ----------
Commitments and contingencies............          --           --          --
Minority interest in Operating Partner-
 ship....................................       81,168          --          --
                                            ----------   ----------  ----------
Stockholders' equity:
  Preferred stock, $.01 par value,
   50,000,000 shares authorized, none is-
   sued or outstanding...................
  Common stock, $.01 par value,
   250,000,000 shares authorized,
   38,693,541 issued and outstanding.....          387          --          --
  Additional paid in capital.............      172,315          --          --
  Retained earnings......................       22,779          --          --
Owners' deficit..........................          --      (576,632)   (506,653)
                                            ----------   ----------  ----------
   Total stockholders' and owners' equity
    (deficit)............................      195,481     (576,632)   (506,653)
                                            ----------   ----------  ----------
    Total liabilities and stockholders'
     and owners' equity (deficit)........   $1,295,638   $  896,511  $  922,786
                                            ==========   ==========  ==========
</TABLE>
 
 The accompanying notes are an integral part of these consolidated and combined
                             financial statements.
 
                                      F-17
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
               CONSOLIDATED AND COMBINED STATEMENTS OF OPERATIONS
 
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                             THE COMPANY                         THE PREDECESSOR GROUP
                          ------------------ ---------------------------------------------------------------
                            JUNE 23, 1997    JANUARY 1, 1997    NINE MONTHS      YEARS ENDED DECEMBER 31,
                                  TO               TO              ENDED        ----------------------------
                          SEPTEMBER 30, 1997  JUNE 22, 1997  SEPTEMBER 30, 1996   1996      1995      1994
                          ------------------ --------------- ------------------ --------  --------  --------
                             (UNAUDITED)       (UNAUDITED)      (UNAUDITED)
<S>                       <C>                <C>             <C>                <C>       <C>       <C>
Revenue:
  Rental:
    Base rent...........       $57,892          $ 80,122          $127,727      $169,420  $155,614  $153,101
    Recoveries from
     tenants............         6,144            10,283            17,401        22,607    21,124    21,710
    Parking and other...           217             3,397             2,263         2,979     2,527     1,914
                               -------          --------          --------      --------  --------  --------
      Total rental
       revenue..........        64,253            93,802           147,391       195,006   179,265   176,725
  Hotel.................           --             31,185            47,458        65,678    61,320    58,436
  Development and
   management services..         2,221             3,685             4,880         5,719     4,444     6,090
  Interest and other....         1,879             1,146             2,590         3,530     3,696     2,832
                               -------          --------          --------      --------  --------  --------
      Total revenue.....        68,353           129,818           202,319       269,933   248,725   244,083
                               -------          --------          --------      --------  --------  --------
Expenses:
  Rental:
    Operating...........         8,828            13,650            22,332        29,823    27,142    25,061
    Real estate taxes...         9,065            13,382            21,396        28,372    28,279    28,178
  Hotel:
    Operating...........           --             20,938            30,590        43,634    41,501    40,276
    Real estate taxes...           --              1,514             1,769         3,100     2,517     2,477
  General and
   administrative.......         3,164             5,116             8,149        10,754    10,372    10,123
  Interest..............        16,091            53,324            82,627       109,394   108,793    97,273
  Depreciation and
   amortization.........        10,113            17,054            27,008        36,199    33,828    33,112
                               -------          --------          --------      --------  --------  --------
     Total expenses.....        47,261           124,978           193,871       261,276   252,432   236,500
                               -------          --------          --------      --------  --------  --------
Income (loss) before
 extraordinary items and
 minority interests.....        21,092             4,840             8,448         8,657    (3,707)    7,583
Minority interest in
 combined partnership...           (69)             (235)             (288)         (384)     (276)     (412)
                               -------          --------          --------      --------  --------  --------
Income (loss) before
 minority interest in
 Operating Partnership
 and extraordinary
 items..................        21,023             4,605             8,160         8,273    (3,983)    7,171
Minority interest in
 Operating Partnership..        (6,169)              --                --            --        --        --
                               -------          --------          --------      --------  --------  --------
Income (loss) before
 extraordinary items....        14,854             4,605             8,160         8,273   (3,983)     7,171
Net extraordinary items
 on early
 extinguishments, net of
 minority interest......         7,925                --               --           (994)      --        --
                               -------          --------          --------      --------  --------  --------
Net income (loss).......       $22,779          $  4,605          $  8,160      $  7,279  $ (3,983) $  7,171
                               =======          ========          ========      ========  ========  ========
Net income per share....       $   .59
                               =======
Shares outstanding......        38,694
                               =======
</TABLE>
 
 The accompanying notes are an integral part of these consolidated and combined
                             financial statements.
 
                                      F-18
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
    CONSOLIDATED AND COMBINED STATEMENTS OF STOCKHOLDERS' AND OWNERS' EQUITY
                                   (DEFICIT)
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                            STOCKHOLDERS
                                                 ADDITIONAL  AND OWNERS
                             COMMON               PAID-IN      EQUITY
                          STOCK SHARES PAR VALUE  CAPITAL    (DEFICIT)     TOTAL
                          ------------ --------- ---------- ------------ ----------
<S>                       <C>          <C>       <C>        <C>          <C>
THE PREDECESSOR GROUP
Owners' Deficit, January
 1, 1994................        --        --           --    $(495,104)  $ (495,104)
  Contributions.........        --        --           --       24,323       24,323
  Net income............        --        --           --        7,171        7,171
  Distributions.........        --        --           --      (38,620)     (38,620)
                             ------      ----     --------   ---------   ----------
Owners' Deficit,
 December 31, 1994......        --        --           --     (502,230)    (502,230)
  Contributions.........        --        --           --       44,661       44,661
  Net loss..............        --        --           --       (3,983)      (3,983)
  Distributions.........        --        --           --      (45,101)     (45,101)
                             ------      ----     --------   ---------   ----------
Owners' Deficit,
 December 31, 1995......        --        --           --     (506,653)    (506,653)
  Contributions.........        --        --           --       33,279       33,279
  Net income............        --        --           --        7,279        7,279
  Distributions and
   conversion of equity
   to note payable-
   affiliate............        --        --           --     (110,537)    (110,537)
                             ------      ----     --------   ---------   ----------
Owners' Deficit,
 December 31, 1996......        --        --           --     (576,632)    (576,632)
  Contributions
   (unaudited)..........        --        --           --        9,330        9,330
  Net income
   (unaudited)..........        --        --           --        4,605        4,605
  Distributions
   (unaudited)..........        --        --           --      (32,125)     (32,125)
                             ------      ----     --------   ---------   ----------
Owners' Deficit, June
 22, 1997...............        --        --           --    $(594,822)  $ (594,822)
                             ======      ====     ========   =========   ==========
THE COMPANY, (UNAUDITED)
  Sale of Common Stock
   net of Offering
   costs................     38,694      $387     $839,209         --     $ 837,558
  Allocation of minority
   interest in Operating
   Partnership..........                          (666,894)        --      (664,856)
  Net income, June 23,
   1997 to
   September 30, 1997...        --        --           --    $  22,779       22,779
                             ------      ----     --------   ---------   ----------
Stockholders' Equity,
  September 30, 1997....     38,694      $387     $172,315   $  22,779    $ 195,481
                             ======      ====     ========   =========   ==========
</TABLE>
 
 
 The accompanying notes are an integral part of these consolidated and combined
                             financial statements.
 
                                      F-19
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
               CONSOLIDATED AND COMBINED STATEMENTS OF CASH FLOWS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                           THE COMPANY                  THE PREDECESSOR GROUP
                          ------------- -------------------------------------------------------
                            JUNE 23,    JANUARY 1,   NINE MONTHS
                             1997 TO      1997 TO       ENDED      YEARS ENDED DECEMBER 31,
                          SEPTEMBER 30,  JUNE 22,   SEPTEMBER 30, -----------------------------
                              1997         1997         1996        1996       1995      1994
                          ------------- ----------- ------------- ---------  --------  --------
                           (UNAUDITED)  (UNAUDITED)  (UNAUDITED)
<S>                       <C>           <C>         <C>           <C>        <C>       <C>
Cash flows from
 operating activities:
 Net income (loss)......    $  22,779    $  4,605     $  8,160    $   7,279  $ (3,983) $  7,171
 Adjustments to
  reconcile net income
  (loss) to net cash
  provided by operating
  activities:
 Depreciation and
  amortization..........       10,113      17,054       27,008       36,199    33,828    33,112
 Minority interest in
  Operating
  Partnership...........        9,463         --           --           --        --        --
 Effective interest
  adjustment............          173       1,497         483           644     1,347     3,131
 Extraordinary gain on
  early debt
  extinguishment........      (11,216)        --           --           --        --        --
 Change in operating
  assets/liabilities:
 Tenant receivables.....        5,993      (7,114)      (2,856)       2,313    (1,049)      270
 Escrows................          --          --           --        (1,033)      692        21
 Prepaid expenses and
  other assets..........       (3,038)     (1,494)         759        2,777      (360)    1,550
 Accounts payable and
  accrued expenses......       (2,138)      5,220       (2,007)      (1,673)   (2,219)      267
 Accrued interest
  payable...............       (8,049)      2,021       (3,335)         579     1,667       (62)
 Accrued rental income..         (881)       (291)         955          475      (360)    1,252
 Rent received in
  advance, security
  deposits and other
  liabilities...........        2,731       3,728        1,942        3,971      (471)   (1,088)
                            ---------    --------     --------    ---------  --------  --------
 Cash flows provided by
  operating activities..       25,930      25,226       31,109       51,531    29,092    45,624
                            ---------    --------     --------    ---------  --------  --------
Cash flows from
 investing activities:
 Acquisition of or
  additions to real
  estate and equipment..     (366,054)    (27,721)     (14,606)     (30,238)  (33,960)  (11,878)
 Tenant leasing costs...           95      (2,550)         599       (4,077)   (3,191)   (1,554)
 Escrows................          --          --       (28,945)       9,525       307    (4,992)
 Change in accounts
  payable...............          --          --           --         1,101       --        --
 Investment in Joint
  Venture...............       (1,345)     (2,573)         --           --        --        --
 Cash from contributed
  asset.................       10,510         --           --           --        --        --
                            ---------    --------     --------    ---------  --------  --------
 Cash flows used in
  investing activities..     (356,794)    (32,844)     (42,952)     (23,689)  (36,844)  (18,424)
                            ---------    --------     --------    ---------  --------  --------
Cash flows from
 financing activities:
 Net proceeds from sale
  of common stock.......      839,209         --           --           --        --        --
 Owners' contributions..          --        9,330        5,317       33,279    44,661    24,323
 Owners' distributions..          --      (32,125)         --      (105,619)  (45,101)  (38,620)
 Borrowings on unsecured
  line of credit........       71,000         --           --           --        --        --
 Proceeds from mortgage
  notes payable.........      220,000         --           --       117,269     1,200       --
 Proceeds (payments)
  from notes payable--
  affiliate.............      (38,833)     16,716          169       11,933       171      (236)
 Repayment of mortgage
  notes payable.........     (708,090)     (3,799)      (1,464)     (93,695)  (14,641)  (16,445)
 Accounts receivable--
  affiliate.............          --         (804)         --           --        --        --
 Accounts payable--
  affiliate.............      (19,983)     19,983          --           --        --        --
 Escrows................       14,934        (136)         --        (6,250)      --        --
 Deferred financing
  costs.................      (12,872)        (35)      (5,577)      (1,628)    1,040      (630)
 Costs related to debt
  extinguishment........       (8,512)        --           --           --        --        --
                            ---------    --------     --------    ---------  --------  --------
 Cash flows provided by
  (used in) financing
  activities............      356,853       9,130       (1,555)     (44,711)  (12,670)  (31,608)
                            ---------    --------     --------    ---------  --------  --------
Net increase (decrease)
 in cash and cash
 equivalents............       25,989       1,512      (13,398)     (16,869)  (20,422)   (4,408)
Cash and cash
 equivalents, beginning
 of period..............          --        8,998       25,867       25,867    46,289    50,697
                            ---------    --------     --------    ---------  --------  --------
Cash and cash
 equivalents, end of
 period.................    $  25,989    $ 10,510     $ 12,469    $   8,998  $ 25,867  $ 46,289
                            =========    ========     ========    =========  ========  ========
Supplemental cash flow
 information:
 Cash paid for
  interest..............    $  26,032    $ 50,917     $ 80,775    $ 107,700  $108,618  $ 95,269
                            =========    ========     ========    =========  ========  ========
 Interest capitalized...    $     683    $  1,111     $    275    $     366  $  1,543  $    --
                            =========    ========     ========    =========  ========  ========
Supplemental disclosure
 of noncash
 transactions:
 Conversion of owners'
  equity to notes
  payable--affiliate....          --          --           --     $   4,918  $    --   $    --
                            =========    ========     ========    =========  ========  ========
 Net liabilities assumed
  in connection with the
  contribution of prop-
  erties................    $ 594,822         --           --           --        --        --
                            =========    ========     ========    =========  ========  ========
 Reallocation of addi-
  tional paid in capital
  to minority interest
  in operating partner-
  ship..................    $ 666,894         --           --           --        --        --
                            =========    ========     ========    =========  ========  ========
</TABLE>
 The accompanying notes are an integral part of these consolidated and combined
                             financial statements.
 
                                      F-20
<PAGE>
 
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
       NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS
                   (DOLLARS IN THOUSANDS, EXCEPT SHARE DATA)
 
1. ORGANIZATION AND BASIS OF PRESENTATION:
 
  Organization
 
  Boston Properties, Inc. (The "Company") a Delaware corporation, was formed
to succeed (i) the real estate development, redevelopment, ownership,
acquisition, management, operating and leasing business associated with Boston
Properties, Inc., a Massachusetts corporation founded in 1970, and (ii)
various property partnerships under common control with the predecessor
company (collectively, the "Boston Properties Predecessor Group" or the
"Predecessor"). The Company intends to qualify as a real estate investment
trust ("REIT") under the Internal Revenue Code of 1986, as amended.
 
  On June 23, 1997, the Company commenced operations after completing an
initial public offering of 36,110,000 common shares (including 4,710,000
shares issued as a result of the exercise of an over-allotment option by the
underwriters) (the "Initial Offering"). The 36,110,000 shares of common stock
were issued at a price per share of $25.00, generating gross proceeds of
$902,750. The proceeds to the Company, net of underwriters' discount and
offering costs were approximately $839,209.
 
  The following transactions occurred simultaneously with the completion of
the Initial Offering (collectively, the "Formation Transactions").
 
 .  The Company became the sole general partner of Boston Properties Limited
   Partnership (the "Operating Partnership"). Upon completion of the Initial
   Offering, the Company contributed substantially all of the net proceeds of
   the offering in exchange for an approximate 70.66% interest in the
   Operating Partnership.
 
 .  The Operating Partnership exercised various option and purchase agreements
   whereby it issued units in the Operating Partnership ("Units") representing
   an approximate 29.34% limited partnership interest, to the continuing
   investors in exchange for interests in certain properties.
 
 .  The Company contributed substantially all of its Greater Washington, DC
   third-party management business to Boston Properties Management, Inc. (the
   "Development and Management Company"), a subsidiary of the Operating
   Partnership.
 
 .  The Operating Partnership entered into a participating lease with ZL Hotel
   LLC. Marriott International, Inc. manages the Company's two hotel
   properties under the Marriott(R) name. Messrs. Zuckerman and Linde are the
   sole member-managers of the ZL Hotel LLC and own a 9.8% economic interest
   in ZL Hotel LLC. ZL Hotel Corp. owns the remaining 90.2% economic interest
   in ZL Hotel LLC. Certain public charities own all the capital stock of ZL
   Hotel Corp.
 
 .  The Company, through the Operating Partnership, entered into a $300 million
   unsecured credit facility with BankBoston, N.A., as agent (the "Unsecured
   Line of Credit"). The Unsecured Line of Credit is a recourse obligation of
   the Operating Partnership and is guaranteed by the Company. The Company has
   used the Unsecured Line of Credit principally to fund growth opportunities
   and for working capital purposes. The Company's ability to borrow under the
   Unsecured Line of Credit is subject to the Company's ongoing compliance
   with a number of financial and other covenants.
 
 .  The Operating Partnership utilized $696,236 of the proceeds of the
   Offering, together with $54,000 under the Unsecured Line of Credit, to
   repay $707,071 of mortgage indebtedness ($47,780 of which was paid on July
   1, 1997), $28,843 of indebtedness due to Messrs. Zuckerman and Linde
   related to development of properties in process and $14,322 to fund the
   acquisition of an approximate 170,000 square foot office building located
   in Quincy, Massachusetts.
 
 .  Messrs. Zuckerman and Linde received an aggregate of 2,583,541 shares.
 
 
                                     F-21
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                            (DOLLARS IN THOUSANDS)
 
Basis of Presentation
 
  The accompanying consolidated financial statements of Boston Properties,
Inc. include all accounts of the Company and its subsidiaries, including the
Operating Partnership as of September 30, 1997 (unaudited) and for the period
June 23, 1997 to September 30, 1997 (unaudited). All significant intercompany
amounts have been eliminated.
 
  The accompanying combined financial statements of the Boston Properties
Predecessor Group comprise interests in properties and the third party
commercial real estate development, project management and property management
business of Boston Properties, Inc. as of September 30, 1996 and for the
period from January 1, 1997 to June 22, 1997 and years ended December 31,
1996, 1995 and 1994. All significant intercompany amounts have been
eliminated.
 
  The business combination was structured as an exchange of properties or
partnership interests by the Boston Properties Predecessor Group for limited
partnership interests in the Operating Partnership, which holds the operating
assets of the Company. The Company is the general and majority partner of the
Operating Partnership. The Operating Partner holds all of the assets of the
Predecessor entities as a result of the business combination. Due to the
affiliation of the Predecessor, the business combination was accounted for as
a reorganization of entities under common control which is similar to the
accounting used for a pooling of interests. All significant intercompany
balances and transactions have been eliminated in the consolidated
presentation.
 
Properties
 
  December 31, 1996
 
  The interests in properties at December 31, 1996 included in the
accompanying consolidated financial statements consist of 72 commercial real
estate properties (the "Properties") aggregating approximately 10.4 million
square feet. The Predecessor also owns a 75.0% general partner interest (100%
economic interest as a result of a priority of the Predecessor's interest in
one of the properties which comprises approximately 122,000 square feet).
Additionally, the Predecessor owns a 35.7% controlling general partnership
interest in 11 of the properties which comprise approximately 204,500 square
feet. The Properties consist of 60 office properties with approximately 7.1
million net rentable square feet, including five office properties currently
under development or redevelopment totaling approximately 371,000 net rentable
square feet (the "Office Properties"); nine industrial properties with
approximately 925,000 net rentable square feet (the "Industrial Properties");
two full service hotels totaling 833 rooms and approximately 750,000 square
feet (the "Hotel Properties"); and a 1,170 space parking garage with
approximately 332,000 square feet located within the Company's mixed-use
development in East Cambridge, Massachusetts (the "Garage Property"). The
Properties are primarily located in ten submarkets, including five submarkets
in Greater Boston (the East Cambridge, Route 128 NW, Route 128/Massachusetts
Turnpike, Route 128 SW and downtown Boston submarkets), five submarkets in
Greater Washington, D.C. (the Southwest and West End Washington, D.C.,
Montgomery County, Maryland, Fairfax County, Virginia and Prince George's
County, Maryland Submarkets) and midtown Manhattan (the Park Avenue
Submarket). The Predecessors' single largest Property, with approximately 1.0
million net rentable square feet, is an Office Property located in the Park
Avenue submarket of midtown Manhattan.
 
  Property Acquisitions
 
  On June 25, 1997, the Company acquired Newport Office Park, for $21.7
million. The property is an approximately 170,000 square foot office building
located in Quincy, Massachusetts.
 
  On September 11, 1997, the Company acquired 280 Park Avenue, a Class A
Office Building located in midtown Manhattan. The 1.2 million square foot
property was acquired for approximately $322.6 million. The acquisition was
funded by a $220 million loan from Chase Manhattan Bank and $102.6 million of
cash.
 
                                     F-22
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                            (DOLLARS IN THOUSANDS)
 
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
A. REAL ESTATE AND EQUIPMENT
 
  Real estate and equipment are stated at depreciated cost. Pursuant to
Statement of Financial Accounting Standards Opinion No. 121, "Accounting for
the Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed
of", impairment losses are recorded on long-lived assets used in operation,
when events and circumstances indicate that the assets might be impaired and
the estimated undiscounted cash flows to be generated by those assets are less
than the carrying amount of those assets. Upon determination that an
impairment has occurred, those assets shall be reduced to fair value. No such
impairment losses have been recognized to date.
 
  The cost of buildings and improvements includes the purchase price of
property, legal fees, acquisition costs as well as interest, property taxes
and other costs incurred during the period of development.
 
  Depreciation is computed on the straight line basis over the estimated
useful lives of the assets, as follows:
 
<TABLE>
   <S>                                            <C>
   Land improvements............................. 25 to 40 years
   Building costs................................ 10 to 40 years
   Tenant improvements........................... Terms of the lease useful life
   Furniture, fixtures, and equipment............ 5 to 7 years
</TABLE>
 
  Depreciation expense for corporate furniture, fixtures, and equipment and
corporate occupied real property was $375 and $417 for the period from January
1, 1997 to June 22, 1997 and the period from June 23, 1997 to September 30,
1997, collectively the period (the "Nine Months Ended") and the nine months
ended September 30, 1996, respectively, and $556, $588 and $603 for the years
ended December 31, 1996, 1995 and 1994, respectively.
 
  Expenditures for repairs and maintenance are charged to operations as
incurred. Significant betterments are capitalized.
 
  When assets are sold or retired, their costs and related accumulated
depreciation are removed from the accounts with the resulting gains or losses
reflected in net income or (loss) for the period.
 
B. CASH AND CASH EQUIVALENTS
 
  Cash and cash equivalents consist of cash on hand and investments with
maturities of three months or less from the date of purchase. The majority of
the Company's and the Predecessor's cash and cash equivalents are held at
major commercial banks. There have been no experienced losses to date on any
invested cash.
 
C. ESCROWS
 
  Escrows include amounts established pursuant to various agreements for
security deposits, property taxes, insurance and capital improvements.
 
D. REVENUE RECOGNITION
 
  Base rental revenue is reported on a straight-line basis over the terms of
the respective leases. The impact of the straight line rent adjustment
increased revenues by $1,171 and decreased revenues by $955 for the nine
months ended September 30, 1997 and 1996, respectively, and decreased revenues
by $475, increased revenues by $360, and decreased revenues by $1,252 for the
years ended December 31, 1996, 1995 and 1994, respectively.
 
  Accrued rental income represents rental income earned in excess of rent
payments received pursuant to the terms of the individual lease agreements,
net of an allowance for doubtful accounts.
 
                                     F-23
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                            (DOLLARS IN THOUSANDS)
 
 
  Development fees are recognized ratably over the period of development.
Management fees are recognized as revenue as they are earned.
 
  Revenue recognition of fees received for lease terminations are deferred and
amortized to income using the straight line method over the remaining original
lease term until the space is subsequently leased.
 
E. OFFERING COSTS
 
  Underwriting commissions and offering costs incurred in connection with the
Initial Offering have been reflected as a reduction of additional paid in
capital.
 
F. INCOME TAXES
 
  Prior to June 23, 1997, all of the Properties were owned by partnerships,
trusts and an S-corporation, none of which are directly subject to income tax.
The tax effect of its activities accrues to the individual partners and or
principals of the respective entity.
 
  Certain entities included in the Company's consolidated financial statements
and the Predecessor's combined financial statements are subject to District of
Columbia franchise taxes. Franchise taxes are recorded as rental operating
expenses in the accompanying combined financial statements.
 
  The ongoing operations of these Properties generally will not be subject to
Federal income taxes as long as the Company qualifies as a real estate
investment trust ("REIT"). A REIT will generally not be subject to Federal
income taxation on that portion of its income that qualifies as REIT taxable
income to the extent that it distributes such taxable income to it's
stockholders and complies with certain requirements (including distribution of
at least 95% of its taxable income). As a REIT, the Company is allowed to
reduce taxable income by all or a portion of its distributions to
stockholders. As distributions have exceeded taxable income, no Federal income
tax provision (benefit) has been reflected in the accompanying consolidated
Financial Statements. State income taxes are not significant.
 
G. EARNINGS PER SHARE
 
  Earnings per share is calculated based on the weighted average number of
common shares outstanding. The assumed exercise of outstanding stock options,
using the treasury stock method, is immaterial, and therefore such amounts are
not presented.
 
H. DEFERRED COSTS
 
  Deferred costs include tenant leasing costs and deferred financing fees.
 
  Fees and 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.
 
  Fees and costs incurred to obtain long-term financing have been deferred and
are being amortized over the terms of the respective loans on a basis which
approximates the effective interest method.
 
I. INVESTMENT IN JOINT VENTURE
 
  The investment in joint venture represents a 25% interest in an entity which
will own two office buildings in Reston, VA for which the Company serves as
development manager. Such investment is accounted for under the equity method.
 
J. INTEREST EXPENSE
 
  Interest expense on fixed rate debt with periodic rate increases is computed
using the effective interest method over the terms of the respective loans.
 
                                     F-24
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                            (DOLLARS IN THOUSANDS)
 
 
K. PARTNERS' CAPITAL CONTRIBUTIONS, DISTRIBUTIONS AND PROFITS AND LOSSES
 
  Partners' capital contributions, distributions and profits and losses are
allocated in accordance with the terms of individual partnership agreements.
 
L. USE OF ESTIMATES IN THE PREPARATION OF FINANCIAL STATEMENTS
 
  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 period. Actual results could differ from those estimates.
 
M. UNAUDITED INTERIM STATEMENTS
 
  The combined consolidated financial statements as of September 30, 1997 and
for the nine months ended September 30, 1997 and 1996 and accompanying
footnotes are unaudited. In the opinion of management, all adjustments
(consisting solely of normal recurring adjustments) necessary for a fair
presentation of such combined financial statements have been included. The
results of operations for the periods described above are not necessarily
indicative of the Company's future results of operations for the full year
ending December 31, 1997.
 
N. RECLASSIFICATIONS
 
  Certain amounts have been reclassified in the 1996, 1995 and 1994 financial
statements in order to conform with the current presentation.
 
3. MORTGAGE NOTES PAYABLE:
 
  Mortgage notes payable are comprised of 16, 44 and 44 loans at September 30,
1997, December 31, 1996 and 1995, respectively, each of which is
collateralized by a building and related land included in real estate assets.
The mortgage notes payable are generally due in monthly installments and
mature at various dates through September 30, 2012. Interest rates on fixed
rate mortgage notes payable aggregating $689,947, $1,013,361 and $929,226 at
September 30, 1997, December 31, 1996 and 1995, respectively, range from 7.35%
to 9.875% (averaging 7.37% and 8.18% at September 30, 1997, and December 31,
1996, respectively). Interest rates on variable rate mortgage notes payable
aggregating $295,667, $385,985 and $446,546 at September 30, 1997, December
31, 1996 and 1995, respectively, range from 0.7% above the London Interbank
Offered Rate ("LIBOR"), 5.6% at September 30, 1997 and December 31, 1996 to
1.75% above the LIBOR rate.
 
  The interest rates related to the mortgage notes payable for two properties
aggregating $199,313 at September 30, 1997 and for three properties
aggregating, $610,782 and $612,657 at December 31, 1996 and 1995, respectively
are subject to periodic scheduled rate increases. Interest expense for these
mortgage notes payable is computed using the effective interest method. The
impact of using this method increased interest expense $132 and $161 for the
nine months ended September 30, 1997 and 1996, respectively, and $644, $1,347
and $3,131 for the years ended December 31, 1996, 1995 and 1994, respectively.
The cumulative liability related to these adjustments is $782, $21,013 and
$20,369 at September 30, 1997, December 31, 1996 and 1995, respectively, and
is included in mortgage notes payable.
 
  Combined aggregate principal maturities of mortgage notes payable at
December 31, 1996 are as follows:
 
<TABLE>
<CAPTION>
                                                                     DECEMBER 31
                                                                     -----------
   <S>                                                               <C>
   1997.............................................................  $334,784
   1998.............................................................   219,748
   1999.............................................................    11,315
   2000.............................................................    48,040
   2001.............................................................   153,148
</TABLE>
 
                                     F-25
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                            (DOLLARS IN THOUSANDS)
 
 
  Certain mortgage indebtedness aggregating $707,071 was repaid in conjunction
with the Initial Offering of which $659,291 and $47,780 was repaid at June 23,
1997 and July 1, 1997, respectively. The repayments, along with (i) the
payment of certain related prepayment penalties, (ii) the write-off of the
related previously capitalized deferred financing costs, and (iii) the
extinguishment of the excess of the mortgage note payable balance over the
principal payment required for the 599 Lexington Avenue property (which was a
result of the application of the effective interest method to this increasing
rate loan), generated a net gain of $7,925 (net of minority interest share of
$3,291), which has been reflected as an extraordinary gain to the Company in
the period from June 23, 1997 to September 30, 1997.
 
  Certain mortgage notes payable are subject to prepayment penalties of
varying amounts in the event of an early principal repayment.
 
4. LEASING ACTIVITIES:
 
  Future minimum lease payments to be received as of December 31, 1996 under
noncancelable operating leases, which expire on various dates through 2012,
are as follows:
 
<TABLE>
   <S>                                                                 <C>
   Years ending December 31:
     1997............................................................. $161,817
     1998.............................................................  146,721
     1999.............................................................  137,180
     2000.............................................................  122,164
     2001.............................................................  110,626
     Thereafter.......................................................  506,398
</TABLE>
 
  One major tenant, the General Services Administration, represented 12%, 15%,
15%, 17% and 16% of the Predecessor's total rental income for the nine months
ended September 30, 1997 and 1996 and for the years ended December 31, 1996,
1995, and 1994, respectively.
 
5. MINORITY INTEREST:
 
  Minority interest in the Operating Partnership relates to the interest in
the Operating Partnership that is not owned by the Company which, at September
30, 1997, amounted to 29.34%.
 
  In conjunction with the formation of the Company, persons contributing
interests in properties to the Operating Partnership received Units. Beginning
fourteen months after the completion of the offering, the Operating
Partnership will, at the request of any Unitholder, be obligated to redeem
each Unit held by such Unitholder for, at the option of the Operating
Partnership, (i) cash equal to the fair market value of one share of the
Company's common stock at the time of redemption, or (ii) one share of the
Company's common stock. Such redemptions will cause the Company's percentage
ownership in the Operating Partnership to increase.
 
6. RELATED PARTY TRANSACTIONS:
 
  Notes payable--affiliates consists of amounts funded by affiliates for
office buildings under renovation or construction. The notes bear interest at
the prime rate plus 1% and are due on demand.
 
  Rental income of $7,949, $7,773, $10,455, $10,522 and $10,518 has been
received from affiliates for the nine months ended September 30, 1997 and
1996, and for the years ended December 31, 1996, 1995 and 1994, respectively.
 
                                     F-26
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                            (DOLLARS IN THOUSANDS)
 
 
  Development fees of $0, $25, $25, $125, and $478, have been received from
affiliates for the nine months ended September 30, 1997 and 1996, and for the
years ended December 31, 1996, 1995, and 1994, respectively.
 
  Management fees and other income of $268, $314, $419, $554, and $544, have
been received from affiliates for the nine months ended September 30, 1997 and
1996, and for the years ended December 31, 1996, 1995, and 1994, respectively.
 
7. SAVINGS PLAN:
 
  Effective January 1, 1985, the Predecessor adopted a 401(K) Savings Plan
(the "Plan") for its employees. Under the Plan, employees, age 18 and older,
are eligible to participate in the Plan after they have completed three months
of service. In addition, participants may elect to make an after-tax
contribution of up to 10% of their wages.
 
  The Plan provides that matching employer contributions are to be determined
at the discretion of the Predecessor. The Predecessor matches 200% of the
first 2% of pay (utilizing pay that is not in excess of $100). The cost to the
Predecessor of this matching for the nine months ended September 30, 1997 and
1996, and for the years ended December 31, 1996, 1995 and 1994, was $312,
$285, $359, $319 and $216, respectively.
 
  Participants are immediately vested in their pre-tax and after-tax
contributions. Participants vest in the Predecessor's matching contributions
and earnings thereon over a seven year period.
 
8. STOCK OPTION AND INCENTIVE PLAN:
 
  The Company has established a stock option and incentive plan for the
purpose of attracting and retaining qualified executives and rewarding them
for superior performance in achieving the Company's business goals and
enhancing stockholder value. In conjunction with the Offering, the Company
granted options with respect to 2,290,000 common shares to directors, officers
and employees. All of such options were issued at an exercise price of $25.00.
The term of each of such options is 10 years from the date of grant. In
general, one-third of each of the options granted to officers and Mr.
Zuckerman are exercisable on each of the third, fourth, and fifth anniversary
of the date of grant, respectively.
 
  One-third of the options granted to employees who are not officers will be
exercisable on each of the first, second and third anniversary of the date of
grant, respectively. Other than the options granted to Mr. Zuckerman, one-half
of the options granted to non-employee directors will be exercisable on each
of the first and second anniversary of the date of grant, respectively.
 
  As of September 30, 1997, the Company had granted options with respect to
2,290,000 common shares and an additional 2,464,750 common shares were
reserved for issuance under the Company's stock option and incentive plan.
 
9. COMMITMENTS AND CONTINGENCIES:
 
 Legal Matters
 
  The Predecessor is subject to various legal proceedings and claims that
arise in the ordinary course of business. These matters are generally covered
by insurance. The Predecessor 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 Predecessor.
 
 
                                     F-27
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                            (DOLLARS IN THOUSANDS)
 
 Environmental Matters
 
  On January 9, 1997, the Predecessor received a Notice of Potential
Responsibility ("NOR") related to groundwater contamination at one of the
Predecessor's properties located in Massachusetts. The lease with the tenant
of the property contains an indemnification from the tenant to the Predecessor
for liability due to the tenant's actions. The tenant is currently conducting
an investigation. The investigation has identified the presence of hazardous
substances in a catch basin along the property line. It is expected that the
tenant will take any necessary response actions. The Predecessor expects that
any resolution will not have a material impact on the financial position,
results of operations or liquidity of the Predecessor.
 
 Development
 
  The Predecessor has entered into contracts for the construction and
renovation of projects currently under development. Commitments under these
arrangements totaled approximately $155 million at September 30, 1997.
 
  The Predecessor has future development rights related to the purchase,
construction, and completion of approximately 1.6 million square feet of
office and industrial space. The Predecessor is required to make minimum
deposits of $1 million during the next six years to maintain these rights. If
the Predecessor elects to purchase the land, all deposits would be applied to
the purchase price.
 
 Management Contracts
 
  For the years ended December 31, 1996, 1995 and 1994, the hotels were
managed pursuant to contracts which expired in 2012 with a national hotel
management company. These agreements included base and incentive fee
provisions. The fees under these agreements aggregated $4,974, $4,410 and
$4,001, respectively.
 
10. NEWLY ISSUED ACCOUNTING STANDARDS:
 
  Financial Accounting Standards Board Statement No. 128 ("FAS 128") "Earnings
Per Share" is effective for financial statements issued for periods ending
after December 15, 1997, including interim periods. The Company intends to
adopt the requirements of this pronouncement in its financial statements for
the year ending December 31, 1997. FAS 128 specified the computation,
presentation and disclosure requirements for net income per share. FAS 128
also requires the presentation of diluted net income per share which the
Company was not previously required to present under generally accepted
accounting principles.
 
  Financial Accounting Standards Board Statement No. 129 ("FAS 129")
"Disclosure of Information about Capital Structure" is effective for financial
statements issued for periods ending after December 31, 1997. FAS 129
establishes standards for disclosure of information about securities,
liquidation preference of preferred stock and redeemable stock.
 
  Financial Accounting Standards Board Statement No. 130 ("FAS 130")
"Reporting Comprehensive Income" is effective for fiscal years beginning after
December 15, 1997, although earlier application is permitted. The Company
intends to adopt the requirements of this pronouncement in its financial
statements for the year ending December 31, 1998. FAS 130 establishes
standards for reporting and display of comprehensive income and its components
in a full set of general-purpose financial statements. FAS 130 requires that
all components of comprehensive income shall be reported in the financial
statements in the period in which they are recognized. Furthermore, a total
amount for comprehensive income shall be displayed in the financial statement
where the components of other comprehensive income are reported. The Company
was not previously required to present comprehensive income or the components
thereof in its financial statements under generally accepted accounting
principles.
 
                                     F-28
<PAGE>
 
                            BOSTON PROPERTIES, INC.
                                      AND
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
NOTES TO CONDENSED CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
  Financial Accounting Standards Board Statement No. 131 ("FAS 131")
"Disclosures about Segments of an Enterprise and Related Information" is
effective for financial statements issued for periods beginning after December
15, 1997. FAS 131 requires disclosures about segments of an enterprise and
related information regarding the different types of business activities in
which an enterprise engages and the different economic environments in which
it operates.
 
  The Company does not believe that the implementation of FAS 128, FAS 129,
FAS 130 or FAS 131 will have a material impact on its financial statements.
 
11. FAIR VALUE OF FINANCIAL INSTRUMENTS:
 
  The carrying values of cash and cash equivalents, escrows, receivables,
accounts payable, accrued expenses and other assets and liabilities are
reasonable estimates of their fair values because of the short maturities of
these instruments. Mortgage notes payable have aggregate carrying values which
approximate their estimated fair values based upon the remaining maturities
for certain debt and interest rates for debt with similar terms and remaining
maturities.
 
12. COMMITMENTS AND CONTINGENCIES:
 
  The Company has commitments to fund certain development projects and tenant
improvements totaling approximately $100 million as of September 30, 1997.
 
13. SUBSEQUENT EVENTS
 
  On October 23, 1997, the Company acquired 100 East Pratt Street in
Baltimore, Maryland for $137.5 million of cash (including closing costs) and
the issuance of 500 shares of the Company's Common Stock. This Class A Office
Building consists of 634,829 net rentable square feet and an eight-story
parking garage. The acquisition was funded through a draw-down of $137.5
million under the Unsecured Line of Credit.
 
  On November 21, 1997, the Company acquired 875 Third Avenue, for
approximately $209.5 million. The Property is an approximately 682,000 square
foot Class A Office Building located in midtown Manhattan, New York.
 
  On November 11, 1997 the Company has entered into a purchase and sale
agreement to acquire for approximately $174.3 million Riverfront Plaza, a
class A Office Building with approximately 900,000 net rentable square feet
located in Richmond, Virginia.
 
  On October 29, 1997, the Company declared a dividend of $.44 per share
payable on November 21, 1997 to shareholders of record on November 7, 1997.
this dividend relates to the three months ended September 30, 1997 in the
amount of $.405 per share and the period from June 23, 1997 to June 30, 1997
in the amount of $.035 per share.
 
                                     F-29
<PAGE>
 
                                                                    SCHEDULE III
 
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
                    REAL ESTATE AND ACCUMULATED DEPRECIATION
 
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                             INITIAL COST
                                                          ------------------
                                                                                 COSTS
                                                                              CAPITALIZED
                                                                              SUBSEQUENT
 PROPERTY NAME     TYPE        LOCATION      ENCUMBRANCES   LAND   BUILDINGS TO ACQUISITION
- ----------------  ------- ------------------ ------------ -------- --------- --------------
<S>               <C>     <C>                <C>          <C>      <C>       <C>
599 Lexington
Avenue            Office  New York, NY         $430,239    $81,040 $100,507     $ 67,459
2300 N. Street    Office  NW, Washington, DC    100,000     16,509   22,415       10,076
10 & 20 Mall
Road              Office  Burlington, MA         20,215        930    6,928        8,237
8 Arlington
Street            Office  Boston, MA              4,611         90    1,855          133
32 Hartwell Ave   Office  Lexington, MA           4,222        168    1,943        2,720
91 Hartwell Ave   Office  Lexington, MA          13,770        784    6,464        1,342
195 West Street   Office  Waltham, MA             5,856        758    5,150        2,557
191 Spring
Street            Office  Lexington, MA          23,942      5,175   27,166       17,693
201 Spring
Street            Office  Lexington, MA              --      1,500    3,637           --
Waltham Office
Center            Office  Waltham, MA            11,389        422    2,719        2,926
204 Second
Avenue            Office  Waltham, MA             3,374         37    2,402          630
170 Tracer Lane   Office  Waltham, MA             5,146        398    4,601        1,282
33 Hayden Avenue  Office  Lexington, MA              --        266    3,234          110
92 Hayden Avenue  Office  Lexington, MA          11,015        230    3,145          510
100 Hayden
Avenue            Office  Lexington, MA              --        364    3,603          264
Lexington Office
Park              Office  Lexington, MA          15,373        998    1,426        9,472
Bedford Business  Office/ Bedford, MA            23,500        502    3,403       12,743
Park              R & D
One Cambridge
Center            Office  Cambridge, MA          45,000        134   25,110        3,133
Three Cambridge
Center            Office  Cambridge, MA          19,000        174   12,200          598
Ten Cambridge
Center            Office  Cambridge, MA          25,000      1,299   12,943        4,420
Eleven Cambridge
Center            Office  Cambridge, MA           8,319        121    5,535          392
Capital Gallery   Office  SW, Washington DC      60,751      4,725   29,560        7,033
The U.S.
International
Commission
Building          Office  SW, Washington DC      50,000        109   22,420        9,293
                                               --------   -------- --------     --------
Subtotal                                       $880,722   $116,733 $308,366     $163,023
                                               --------   -------- --------     --------
<CAPTION>
                                   GROSS AMOUNT
                            CARRIED AT CLOSE OF PERIOD
                  -----------------------------------------------
                                            DEVELOPMENT
                      LAND       BUILDING       AND                                            DEPRECIABLE
                      AND          AND      CONSTRUCTION          ACCUMULATED    YEAR BUILT/      LIVES
 PROPERTY NAME    IMPROVEMENTS IMPROVEMENTS  IN PROCESS   TOTAL   DEPRECIATION    RENOVATED      (YEARS)
- ----------------- ------------ ------------ ------------ -------- ------------ --------------- -----------
<S>               <C>          <C>          <C>          <C>      <C>          <C>             <C>
599 Lexington
Avenue               $81,040     $167,966      $   --    $249,006  $  58,567              1986     (1)
2300 N. Street        16,509       32,491          --      49,000      9,001              1986     (1)
10 & 20 Mall
Road                     939       15,156          --      16,095      4,474           1984-86     (1)
8 Arlington
Street                    90        1,988          --       2,078        770    1860-1920/1989     (1)
32 Hartwell Ave          168        4,663          --       4,831      2,244   1968-79/1987-88     (1)
91 Hartwell Ave          784        7,806          --       8,590      2,081              1985     (1)
195 West Street        1,611        6,854          --       8,465      1,286              1990     (1)
191 Spring
Street                 5,175       44,859          --      50,034      8,857         1971/1995     (1)
201 Spring
Street                    --           --       5,137       5,137         --              1997     N/A
Waltham Office
Center                   425        5,642          --       6,067      3,004   1968-70/1987-88     (1)
204 Second
Avenue                    37        3,032          --       3,069      1,291         1981/1993     (1)
170 Tracer Lane          418        5,863          --       6,281      2,122              1980     (1)
33 Hayden Avenue         266        3,344          --       3,610      1,517              1979     (1)
92 Hayden Avenue         230        3,655          --       3,885      1,294         1968/1984     (1)
100 Hayden
Avenue                   364        3,867          --       4,231      1,132              1985     (1)
Lexington Office
Park                   1,072       10,824          --      11,896      3,561              1982     (1)
Bedford Business         502       16,146          --      16,648      5,831           1969-80     (1)
Park
One Cambridge
Center                   134       28,243          --      28,377      7,975              1987     (1)
Three Cambridge
Center                   174       12,798          --      12,972      3,181              1987     (1)
Ten Cambridge
Center                 1,868       16,794          --      18,662      4,882              1990     (1)
Eleven Cambridge
Center                   121        5,927          --       6,048      1,975              1984     (1)
Capital Gallery        4,725       36,593          --      41,318     14,192              1981     (1)
The U.S.
International
Commission
Building               1,569       30,253          --      31,822     10,762              1987     (1)
                  ------------ ------------ ------------ -------- ------------
Subtotal            $118,221     $464,764      $5,137    $588,122  $ 149,999
                  ------------ ------------ ------------ -------- ------------
</TABLE>
 
                                      F-30
<PAGE>
 
                                                                    SCHEDULE III
 
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
                    REAL ESTATE AND ACCUMULATED DEPRECIATION
 
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                           INITIAL COST
                                                        -------------------
                                                                                 COSTS
                                                                              CAPITALIZED
                                                                              SUBSEQUENT
PROPERTY NAME      TYPE      LOCATION      ENCUMBRANCES   LAND    BUILDINGS TO ACQUISITIONS
- -------------     ------ ----------------- ------------ --------- --------- ---------------
<S>               <C>    <C>               <C>          <C>       <C>       <C>
Subtotal from
previous page                               $  880,722  $ 116,733 $ 308,366    $ 163,023
                                            ----------  --------- ---------    ---------
One Independence
Square            Office SW, Washington DC      78,700  $   9,356 $  33,701    $  14,170
Two Independence
Square            Office SW, Washington DC     122,856     14,053    59,883        8,795
Montvale Center   Office Gaithersburg, MD        7,992      1,574     9,786        3,433
Democracy Center  Office Bethesda, MD          110,100     12,550    50,015       18,392
7435 Boston
Boulevard,
Building One      Office Springfield, VA         5,564        392     3,822        1,199
7451 Boston
Boulevard,
Building Two      Office Springfield, VA         2,215        249     1,542        1,460
7374 Boston
Boulevard,
Building Four     Office Springfield, VA         3,619        241     1,605          462
8000 Grainger
Court,
Building Five     Office Springfield, VA         7,664        366     4,282          603
7500 Boston
Boulevard,
Building Six      Office Springfield , VA        6,440        138     3,749          206
7501 Boston
Boulevard,
Building Seven    Office Springfield, VA            --        665       878           --
7601 Boston
Boulevard,
Building Eight    Office Springfield, VA         8,372        200     3,883          453
7600 Boston
Boulevard,
Building Nine     Office Springfield, VA         5,796        127     2,839        1,386
7375 Boston
Boulevard,
Building Ten      Office Springfield, VA            --         23     2,685          559
8000 Boston
Boulevard,
Building Eleven   Office Springfield, VA            --        136     3,071           88
                                            ----------  --------- ---------    ---------
 Subtotal                                   $1,240,040  $ 156,803 $ 490,107    $ 214,229
                                            ----------  --------- ---------    ---------
<CAPTION>
                                    GROSS AMOUNT
                             CARRIED AT CLOSE OF PERIOD
                  ------------------------------------------------
                                            DEVELOPMENT
                      LAND       BUILDING       AND                               YEAR    DEPRECIABLE
                      AND          AND      CONSTRUCTION           ACCUMULATED   BUILT/      LIVES
PROPERTY NAME     IMPROVEMENTS IMPROVEMENTS  IN PROCESS    TOTAL   DEPRECIATION RENOVATED   (YEARS)
- -------------     ------------ ------------ ------------ --------- ------------ --------- -----------
<S>               <C>          <C>          <C>          <C>       <C>          <C>       <C>
Subtotal from
previous page      $ 118,221    $ 464,764     $ 5,137    $ 588,122  $ 149,999
                  ------------ ------------ ------------ --------- ------------
One Independence
Square             $   9,634    $  47,593     $    --    $  57,227  $   9,556       1991      (1)
Two Independence
Square                15,038       67,693          --       82,731      9,228       1992      (1)
Montvale Center        2,399       12,394          --       14,793      3,384       1987      (1)
Democracy Center      13,695       67,262          --       80,957     17,710    1985-88      (1)
7435 Boston
Boulevard,
Building One             486        4,927          --        5,413      1,571       1982      (1)
7451 Boston
Boulevard,
Building Two             535        2,716          --        3,251      1,141       1982      (1)
7374 Boston
Boulevard,
Building Four            303        2,005          --        2,308        639       1984      (1)
8000 Grainger
Court,
Building Five            453        4,798          --        5,251      1,509       1984      (1)
7500 Boston
Boulevard,
Building Six             282        3,811          --        4,093      1,174       1985      (1)
7501 Boston
Boulevard,
Building Seven            --           --       1,543        1,543         --       1997      N/A
7601 Boston
Boulevard,
Building Eight           378        4,158          --        4,536      1,270       1986      (1)
7600 Boston
Boulevard,
Building Nine            189        4,163          --        4,352      1,212       1987      (1)
7375 Boston
Boulevard,
Building Ten              47        3,220          --        3,267        894       1988      (1)
8000 Boston
Boulevard,
Building Eleven          214        3,081          --        3,295        629       1989      (1)
                  ------------ ------------ ------------ --------- ------------
 Subtotal          $ 161,874    $ 692,585     $ 6,680    $ 861,139  $ 199,916
                  ------------ ------------ ------------ --------- ------------
</TABLE>
 
                                      F-31
<PAGE>
 
                                                                    SCHEDULE III
 
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
                    REAL ESTATE AND ACCUMULATED DEPRECIATION
 
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                   INITIAL COST
                                                                -------------------
                                                                                        COSTS
                                                                                     CAPITALIZED
                                                                                      SUBSEQUENT
PROPERTY NAME        TYPE          LOCATION        ENCUMBRANCES   LAND    BUILDINGS TO ACQUISITION
- ----------------  ---------- --------------------- ------------ --------- --------- --------------
<S>               <C>        <C>                   <C>          <C>       <C>       <C>
Subtotal from
previous page                                       $1,240,040  $ 156,803 $ 490,107   $ 214,229
                                                    ----------  --------- ---------   ---------
7700 Boston
Boulevard,
Building Twelve   Office     Springfield, VA                --  $   1,105 $   1,042   $      --
Sugarland
Building One      Office     Herndon, VA                    --        735     2,739          --
Sugarland
Building Two      Office     Herndon, VA                    --        834     3,216          --
Hilltop Business
Center            Office     So. San Francisco, CA       4,817         53       492         140
164 Lexington
Road              Office     Billerica, MA               1,970        592     1,370         127
25-33 Dartmouth
Street            Industrial Westwood, MA                3,296        273     1,595         470
40-46 Harvard
Street            Industrial Westwood, MA                5,380        351     1,782       1,347
1950 Stanford
Court, Building
One               Industrial Landover, MD                2,662        269     1,554         161
6201 Columbia
Park, Building
Two               Industrial Landover, MD                5,023        505     2,746         951
2000 South Club
Drive, Building
Three             Industrial Landover, MD                3,542        465     2,125         702
38 Cabot
Boulevard         Industrial Bucks County, PA               --        329     1,238       1,933
430 Rozzi Place   Industrial So. San Francisco, CA          --         24       217          67
560 Forbes
Boulevard         Industrial So. San Francisco, CA          --         48       435         133
2391 West Winton
Avenue            Industrial Hayward, CA                 1,343        182     1,217          41
17 Hartwell
Avenue            R&D        Lexington, MA                 938         26       150         362
Fourteen
Cambridge         R&D        Cambridge, MA               6,748        110     4,483          --
Long Wharf
Marriott          Hotel      Boston, MA                 68,600      1,752    37,534       2,216
Cambridge Center  Hotel      Cambridge, MA              61,000        478    37,918       3,734
Cambridge Center
N.                Garage     Cambridge, MA              15,000        639    11,630         527
                                                    ----------  --------- ---------   ---------
 Subtotal                                           $1,420,359  $ 165,573 $ 603,590   $ 227,140
                                                    ----------  --------- ---------   ---------
<CAPTION>
                                    GROSS AMOUNT
                             CARRIED AT CLOSE OF PERIOD
                  ------------------------------------------------
                                            DEVELOPMENT
                                                AND                                          DEPRECIABLE
                    LAND AND   BUILDING AND CONSTRUCTION           ACCUMULATED  YEAR BUILT/     LIVES
PROPERTY NAME     IMPROVEMENTS IMPROVEMENTS  IN PROCESS    TOTAL   DEPRECIATION  RENOVATED     (YEARS)
- ----------------- ------------ ------------ ------------ --------- ------------ ------------ -----------
<S>               <C>          <C>          <C>          <C>       <C>          <C>          <C>
Subtotal from
previous page      $ 161,874    $ 692,585     $  6,680   $ 861,139  $ 199,916
                  ------------ ------------ ------------ --------- ------------
7700 Boston
Boulevard,
Building Twelve    $      --    $      --     $  2,147   $   2,147  $      --           1997     N/A
Sugarland
Building One              --           --        3,474       3,474         --      1985/1997     N/A
Sugarland
Building Two              --           --        4,050       4,050         --      1986/1997     N/A
Hilltop Business
Center                    53          632           --         685        260   early 1970's     (1)
164 Lexington
Road                     592        1,497           --       2,089         39           1995     (1)
25-33 Dartmouth
Street                   273        2,065           --       2,338      1,120           1966     (1)
40-46 Harvard
Street                   351        3,129           --       3,480      2,244           1967     (1)
1950 Stanford
Court, Building
One                      350        1,634           --       1,984        444           1986     (1)
6201 Columbia
Park, Building
Two                      960        3,242           --       4,202      1,186           1986     (1)
2000 South Club
Drive, Building
Three                    859        2,433           --       3,292        682           1988     (1)
38 Cabot
Boulevard                329        3,171           --       3,500      2,709      1972/1984     (1)
430 Rozzi Place           24          284           --         308        117   early 1970's     (1)
560 Forbes
Boulevard                 48          568           --         616        234   early 1970's     (1)
2391 West Winton
Avenue                   182        1,258           --       1,440        858           1974     (1)
17 Hartwell
Avenue                    26          512           --         538        435           1968     (1)
Fourteen
Cambridge                110        4,483           --       4,593      1,569           1983     (1)
Long Wharf
Marriott               1,752       39,750           --      41,502     14,527           1982     (1)
Cambridge Center         478       41,652           --      42,130     10,129           1986     (1)
Cambridge Center
N.                     1,163       11,633           --      12,796      2,000           1990     (1)
                  ------------ ------------ ------------ --------- ------------
 Subtotal          $ 169,424    $ 810,528     $ 16,351   $ 996,303  $ 238,469
                  ------------ ------------ ------------ --------- ------------
</TABLE>
 
                                      F-32
<PAGE>
 
                                                                    SCHEDULE III
 
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
                    REAL ESTATE AND ACCUMULATED DEPRECIATION
 
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                           INITIAL COST
                                                        -------------------
                                                                                COSTS
                                                                             CAPITALIZED
                                                                              SUBSEQUENT
PROPERTY NAME        TYPE       LOCATION   ENCUMBRANCES   LAND    BUILDINGS TO ACQUISITION
- -------------     ----------- ------------ ------------ --------- --------- --------------
<S>               <C>         <C>          <C>          <C>       <C>       <C>
Subtotal from
previous page                               $1,420,359  $ 165,573 $ 603,590   $ 227,140
                                            ----------  --------- ---------   ---------
Cambridge Master                Cambridge,
Plan              Development           MA          --  $   1,722 $      --   $   1,727
Maryland Master                  Landover,
Plan              Development           MD          --        464        --          --
Virginia Master               Springfield,
Plan              Development           VA          --        655        --         666
                                            ----------  --------- ---------   ---------
Total                                       $1,420,359  $ 168,414 $ 603,590   $ 229,533
                                            ----------  --------- ---------   ---------
<CAPTION>
                                     GROSS AMOUNT
                              CARRIED AT CLOSE OF PERIOD
                  --------------------------------------------------
                                            DEVELOPMENT
                                                AND                                           DEPRECIABLE
                    LAND AND   BUILDING AND CONSTRUCTION             ACCUMULATED  YEAR BUILT/    LIVES
PROPERTY NAME     IMPROVEMENTS IMPROVEMENTS  IN PROCESS     TOTAL    DEPRECIATION  RENOVATED    (YEARS)
- -------------     ------------ ------------ ------------ ----------- ------------ ----------- -----------
<S>               <C>          <C>          <C>          <C>         <C>          <C>         <C>
Subtotal from
previous page      $ 169,424    $ 810,528     $ 16,351   $   996,303  $ 238,469
                  ------------ ------------ ------------ ----------- ------------
Cambridge Master
Plan               $      --    $      --     $  3,449   $     3,449  $      --     Various       N/A
Maryland Master
Plan                      --           --          464           464         --     Various       N/A
Virginia Master
Plan                      --           --        1,321         1,321         --     Various       N/A
                  ------------ ------------ ------------ ----------- ------------
Total              $ 169,424    $ 810,528     $ 21,585   $ 1,001,537  $ 238,469
                  ------------ ------------ ------------ ----------- ------------
</TABLE>
- ----
(1) Depreciation of the Boston Properties Predecessor Group's buildings and
    improvements are calculated over lives ranging from the life of the lease
    to 40 years.
(2) The aggregate cost and accumulated depreciation for tax purposes was
    $1,042,317 and $412,548, respectively at December 31, 1996.
 
                                      F-33
<PAGE>
 
                      BOSTON PROPERTIES PREDECESSOR GROUP
 
                    REAL ESTATE AND ACCUMULATED DEPRECIATION
 
                               DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
  A summary of activity for real estate and accumulated depreciation is as
follows:
 
<TABLE>
<CAPTION>
                                                   1996       1995      1994
                                                ----------  --------  --------
   <S>                                          <C>         <C>       <C>
   Real estate:
     Balance at beginning of year.............    $979,493  $952,374  $951,693
       Improvements and
        acquisition/development of real
        estate................................      28,110    29,660     9,397
       Write-off of fully depreciated assets..      (6,066)   (2,541)   (8,716)
                                                ----------  --------  --------
     Balance at end of year...................  $1,001,537  $979,493  $952,374
                                                ==========  ========  ========
   Accumulated depreciation:
     Balance at beginning of year.............     215,303   189,712   170,308
       Depreciation expense...................      29,232    28,132    28,120
       Write-off of fully depreciated assets..      (6,066)   (2,541)   (8,716)
                                                ----------  --------  --------
     Balance at end of year...................    $238,469  $215,303  $189,712
                                                ==========  ========  ========
</TABLE>
 
                                      F-34
<PAGE>
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Stockholders of
Boston Properties, Inc.:
 
  We have audited the accompanying statement of revenue over certain operating
expenses of 280 Park Avenue in midtown Manhattan, New York (the "Property")
for the year ended December 31, 1996. This statement is the responsibility of
the Property's management. Our responsibility is to express an opinion on this
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 revenue over
certain 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 statement presentation. We believe that our audit provides a
reasonable basis for our opinion.
 
  The accompanying statement of revenue over certain operating expenses was
prepared for the purpose of complying with Rule 3-14 of the Securities and
Exchange Commission, and excludes certain expenses described in Note 2, and
therefore is not intended to be a complete presentation of the Property's
revenue and expenses.
 
  In our opinion, the statement referred to above presents fairly, in all
material respects, the revenue over certain operating expenses (as described
in Note 2) of 280 Park Avenue for the year ended December 31, 1996 in
conformity with generally accepted accounting principles.
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
October 17, 1997
 
                                     F-35
<PAGE>
 
                                280 PARK AVENUE
                              STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                              FOR THE PERIOD
                                         FOR THE YEAR ENDED JANUARY 1, 1997 TO
                                         DECEMBER 31, 1996  SEPTEMBER 11, 1997
                                         ------------------ ------------------
                                                               (UNAUDITED)
<S>                                      <C>                <C>
Revenue:
  Base rent.............................      $16,786            $17,012
  Recoveries from tenants...............        2,600              1,707
  Other income..........................           59                 80
                                              -------            -------
                                               19,445             18,799
                                              -------            -------
Certain operating expenses (Note 2)
  Utilities.............................        3,777              2,644
  Janitorial and cleaning...............        1,839              1,609
  Security..............................          506                393
  General and administrative............          769                605
  Repairs and maintenance...............        3,028              2,320
  Insurance.............................          250                201
  Real estate taxes.....................        9,908              6,677
                                              -------            -------
                                               20,077             14,449
                                              -------            -------
Excess (deficiency) of revenue over
 certain operating expenses.............      $  (632)           $ 4,350
                                              =======            =======
</TABLE>
 
 
         The accompanying notes are an integral part of the statement.
 
                                      F-36
<PAGE>
 
                                280 PARK AVENUE
                         NOTES TO STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                            (DOLLARS IN THOUSANDS)
 
1. DESCRIPTION OF THE PROPERTY
 
  The accompanying statement of revenue over certain operating expenses (the
"Statement") includes the operations of an approximately 1.2 million square
foot office building located at 280 Park Avenue in midtown Manhattan, New
York. The property was acquired by Boston Properties, Inc. (the "Company") on
September 11, 1997 from Bankers Trust (the "Bank"), an unrelated party. During
1996 and 1997, the Bank, as owner occupant repositioned the Property for sale
and reduced their occupancy from approximately 800,000 sq. ft. to 200,000 sq.
ft. A significant portion of space occupied by the Bank, as owner occupant,
was substantially renovated and leased to outside tenants.
 
2. BASIS OF ACCOUNTING
 
  The accompanying Statement has been prepared on the accrual basis of
accounting. The Statement has been prepared in accordance with Rule 3-14 of
Regulation S-X of the Securities and Exchange Commission for real estate
properties acquired or to be acquired. Accordingly, this statement excludes
revenue attributable to the owner occupied space and certain historical
expenses not comparable to the operations of the Property after acquisition
such as amortization, depreciation, property management fees, certain owner
occupant expenses, corporate expenses and certain other costs not directly
related to the future operations of the Property.
 
3. SIGNIFICANT ACCOUNTING POLICIES
 
  Rental Revenue
 
  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 revenue by approximately $6.2 million and $5.2
million for the year ended December 31, 1996 and for the period January 1,
1997 to September 11, 1997 (unaudited), respectively.
 
  Unaudited Interim Information
 
  The statement of revenue over certain operating expenses for the period from
January 1, 1997 to September 11, 1997 is unaudited. In the opinion of
management, all adjustments necessary for a fair presentation of such
statement have been included. The results of operations for the period are not
necessarily indicative of the Property's future results of operations.
 
  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 revenue and expenses during
the reporting period. Actual results could differ from those estimates.
 
                                     F-37
<PAGE>
 
                                280 PARK AVENUE
                         NOTES TO STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                            (DOLLARS IN THOUSANDS)
 
4 DESCRIPTION OF LEASING ARRANGEMENTS
 
  The commercial and office space is leased to tenants under leases with terms
that vary in length. Certain leases contain real estate tax reimbursement
clauses, operating expenses reimbursement clauses and renewal options. Minimum
lease payments due under noncancelable operating leases in effect as of
September 11, 1997 (unaudited), for the remainder of 1997 and annually
thereafter are as follows:
 
<TABLE>
<CAPTION>
                                             PRO FORMA(1)
                                             ------------
      <S>                                    <C>
      1997 (9/12/97 -12/31/97)                 $  8,859
      1998                                       31,649
      1999                                       40,025
      2000                                       38,726
      2001                                       35,604
      Thereafter                                359,745
</TABLE>
 
  As of September 12, 1997, three tenants, including Bankers Trust occupied
approximately 52% of the leasable square feet and represented 42% of total
1996 Base Rent.
 
(1) Includes the addition of rent that Bankers Trust will owe under terms of a
    lease entered into with the Company concurrent with the sale of the
    Property.
 
                                     F-38
<PAGE>
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Stockholders of
Boston Properties, Inc.:
 
  We have audited the accompanying statement of revenue over certain operating
expenses of 100 East Pratt Street in Baltimore, Maryland (the "Property") for
the year ended December 31, 1996. This statement is the responsibility of the
Property's management. Our responsibility is to express an opinion on this
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 revenue over
certain 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 statement presentation. We believe that our audit provides a
reasonable basis for our opinion.
 
  The accompanying statement of revenue over certain operating expenses was
prepared for the purpose of complying with Rule 3-14 of the Securities and
Exchange Commission, and excludes certain expenses described in Note 2, and
therefore is not intended to be a complete presentation of the Property's
revenue and expenses.
 
  In our opinion, the statement referred to above presents fairly, in all
material respects, the revenue over certain operating expenses (as described
in Note 2) of 100 East Pratt Street for the year ended December 31, 1996 in
conformity with generally accepted accounting principles.
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
November 3, 1997
 
                                     F-39
<PAGE>
 
                             100 EAST PRATT STREET
                              STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                   FOR THE YEAR ENDED    FOR THE NINE MONTHS
                                   DECEMBER 31, 1996   ENDED SEPTEMBER 30, 1997
                                   ------------------ -------------------------
                                                             (UNAUDITED)
<S>                                <C>                <C>
Revenue:
  Base rent.......................      $11,826                $ 9,218
  Recoveries from tenants.........        2,966                  2,133
  Garage--net.....................        2,220                  1,706
  Other income....................          353                    267
                                        -------                -------
                                         17,365                 13,324
                                        -------                -------
Certain operating expenses:
  Utilities.......................        1,661                  1,406
  Janitorial and cleaning.........          637                    504
  Security........................          315                    255
  General and administrative......          566                    424
  Repairs and maintenance.........        1,084                    811
  Insurance.......................           70                     53
  Real estate taxes...............        2,054                  1,541
                                        -------                -------
                                          6,387                  4,994
                                        -------                -------
  Excess of revenue over certain
   operating expenses.............      $10,978                $ 8,330
                                        =======                =======
</TABLE>
 
 
 
         The accompanying notes are an integral part of the statement.
 
                                      F-40
<PAGE>
 
                             100 EAST PRATT STREET
                         NOTES TO STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                            (DOLLARS IN THOUSANDS)
 
1. DESCRIPTION OF THE PROPERTY
 
  The accompanying statement of revenue over certain operating expenses (the
"Statement") includes the operations of 100 East Pratt Street, an
approximately 634,000 square foot office building located on the inner harbor
in downtown Baltimore, Maryland. The Property was acquired on October 23, 1997
from an unrelated third party.
 
2. BASIS OF ACCOUNTING
 
  The accompanying statement of revenue over certain operating expenses is
presented on the accrual basis. This statement has been prepared in accordance
with Rule 3-14 of Regulation S-X of the Securities and Exchange Commission for
real estate properties acquired or to be acquired. Accordingly, this statement
excludes certain historical income and expenses not comparable to the
operations of the property after acquisition, such as interest income,
depreciation, amortization, and interest expense.
 
3. SIGNIFICANT ACCOUNTING POLICIES
 
  Rental Revenue
 
  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 revenue by approximately $361 and decreases revenue
by approximately $318 for the year ended December 31, 1996 and for the nine
months ended September 30, 1997 (unaudited), respectively.
 
  Unaudited Interim Information
 
  The combined statement revenue over certain operating expenses for the nine
months ended September 30, 1997 is unaudited. In the opinion of management,
all adjustments necessary for a fair presentation of such statement have been
included. The results of operations for the period are not necessarily
indicative of the Property's future results of operations.
 
  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.
 
4. DESCRIPTION OF LEASING ARRANGEMENTS
 
  The commercial and office space is leased to tenants under leases with terms
that vary in length. Certain 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,                                  (IN THOUSANDS)
        ------------                                  --------------
        <S>                                           <C>
        1997.........................................    $12,294
        1998.........................................     11,727
        1999.........................................     11,435
        2000.........................................     11,185
        2001.........................................     10,656
        Thereafter...................................     39,516
                                                         -------
        Total future minimum rentals.................    $96,813
                                                         =======
</TABLE>
 
  As of December 31, 1996, two tenants occupied approximately 42% of the
leasable square feet and represented approximately 48% of total 1996 Base
Rent.
 
                                     F-41
<PAGE>
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Stockholders of
Boston Properties, Inc.:
 
  We have audited the accompanying statement of revenue over certain operating
expenses of 875 Third Avenue in Midtown Manhattan, New York (the "Property")
for the year ended December 31, 1996. This statement is the responsibility of
the Property's management. Our responsibility is to express an opinion on this
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 revenue over
certain 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 statement presentation. We believe that our audit provides a
reasonable basis for our opinion.
 
  The accompanying statement of revenue over certain operating expenses was
prepared for the purpose of complying with Rule 3-14 of the Securities and
Exchange Commission, and excludes certain expenses described in Note 2, and
therefore is not intended to be a complete presentation of the Property's
revenue and expenses.
 
  In our opinion, the statement referred to above presents fairly, in all
material respects, the revenue over certain operating expenses (as described
in Note 2) of 875 Third Avenue for the year ended December 31, 1996 in
conformity with generally accepted accounting principles.
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
October 17, 1997
 
                                     F-42
<PAGE>
 
                                875 THIRD AVENUE
                              STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                  FOR THE YEAR ENDED FOR THE NINE MONTHS ENDED
                                  DECEMBER 31, 1996     SEPTEMBER 30, 1997
                                  ------------------ -------------------------
                                                            (UNAUDITED)
<S>                               <C>                <C>
Revenue:
  Base rent......................      $25,255                $18,646
  Recoveries from tenants........        5,813                  3,799
                                       -------                -------
                                        31,068                 22,445
                                       -------                -------
Certain operating expenses (Note
 2)
  Utilities......................        1,002                    859
  Janitorial and cleaning........        1,159                    911
  Security.......................          347                    256
  General and administrative.....          530                    428
  Interest.......................       15,750                 11,813
  Repairs and maintenance........          999                    740
  Insurance......................          212                    161
  Real estate taxes..............        6,365                  4,831
                                       -------                -------
                                        26,364                 19,999
                                       -------                -------
Excess of revenue over certain
 operating expenses..............      $ 4,704                $ 2,446
                                       =======                =======
</TABLE>
 
 
         The accompanying notes are an integral part of the statement.
 
                                      F-43
<PAGE>
 
                               875 THIRD AVENUE
                         NOTES TO STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                            (DOLLARS IN THOUSANDS)
 
1. DESCRIPTION OF THE PROPERTY
 
  The accompanying statement of revenue over certain operating expenses (the
"Statement") includes the operations of 875 Third Avenue, an approximately
691,000 square foot office building located in midtown Manhattan, New York.
The Property will be acquired by Boston Properties, Inc. from an unrelated
third party.
 
2. BASIS OF ACCOUNTING
 
  The accompanying Statement has been prepared on the accrual basis of
accounting. The Statement has been prepared in accordance with Rule 3-14 of
Regulation S-X of the Securities and Exchange Commission for real estate
properties acquired or to be acquired. Accordingly, this statement excludes
certain historical expenses not comparable to the operations of the Property
after acquisition such as amortization, depreciation, property management
fees, certain interest costs, corporate expenses and certain other costs not
directly related to the future operations of the Property.
 
3. SIGNIFICANT ACCOUNTING POLICIES
 
  Rental Revenue
 
  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 revenue by approximately $1.3 million and $768 for
the year ended December 31, 1996, and the nine months ended September 30, 1997
(unaudited), respectively.
 
  Unaudited Interim Information
 
  The statement of revenue over certain operating expenses for the nine months
ended September 30, 1997 is unaudited. In the opinion of management, all
adjustments necessary for a fair presentation of such statement have been
included. The results of operations for the period are not necessarily
indicative of the Property's future results of operations.
 
  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.
 
4. DESCRIPTION OF LEASING ARRANGEMENTS
 
  The commercial and office space is leased to tenants under leases with terms
that vary in length. Certain 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,                                  (IN THOUSANDS)
        ------------                                  --------------
        <S>                                           <C>
        1997.........................................    $22,776
        1998.........................................     24,667
        1999.........................................     24,716
        2000.........................................     22,920
        2001.........................................     22,960
        Thereafter...................................     22,608
</TABLE>
 
 
                                     F-44
<PAGE>
 
                               875 THIRD AVENUE
                         NOTES TO STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                            (DOLLARS IN THOUSANDS)
 
  As of December 31, 1996, 3 tenants occupied approximately 77% of the
leasable square feet and represented 84% of total 1996 Base Rent.
 
5. DEBT ASSUMPTION
 
  In connection with the acquisition, Boston Properties, Inc. will assume a
mortgage note (the "Note") encumbering the property of $180,000 at December
31, 1996. Boston Properties Inc.'s assumption of this mortgage does not
provide for any modification to the original terms; therefore, interest
expense incurred prior to Boston Properties Inc.'s assumption of the mortgage
note is representative of future interest expense. Accordingly, interest
expense of $15,750 for 1996 and $11,813 for the nine months ended September
30, 1997 (unaudited) is recognized in the accompanying Statement. The Note
requires interest only payments through January 1, 2000. Beginning February 1,
2000, the Note requires monthly installments of principal and interest of
$1,417 and matures on January 1, 2003. The interest rate on the note is 8.75%.
The note is subject to a prepayment penalty until January 15, 1998 in the
event of an early principal repayment.
 
  Principal payments due on the mortgage note during the next five years are
approximately as follows:
 
<TABLE>
        <S>   <C>
        1997  $  --
        1998     --
        1999     --
        2000   1,182
        2001   1,401
</TABLE>
 
                                     F-45
<PAGE>
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Stockholders of
Boston Properties, Inc.:
 
  We have audited the accompanying statement of revenue over certain operating
expenses of Riverfront Plaza in Richmond, Virginia (the "Property") for the
year ended December 31, 1996. This statement is the responsibility of the
Property's management. Our responsibility is to express an opinion on this
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 revenue over
certain 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 statement presentation. We believe that our audit provides a
reasonable basis for our opinion.
 
  The accompanying statement of revenue over certain operating expenses was
prepared for the purpose of complying with Rule 3-14 of the Securities and
Exchange Commission, and excludes certain expenses described in Note 2, and
therefore is not intended to be a complete presentation of the Property's
revenue and expenses.
 
  In our opinion, the statement referred to above presents fairly, in all
material respects, the revenue over certain operating expenses (as described
in Note 2) of Riverfront Plaza for the year ended December 31, 1996 in
conformity with generally accepted accounting principles.
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
November 25, 1997
 
                                     F-46
<PAGE>
 
                                RIVERFRONT PLAZA
                              STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                  FOR THE YEAR ENDED FOR THE NINE MONTHS ENDED
                                  DECEMBER 31, 1996     SEPTEMBER 30, 1997
                                  ------------------ -------------------------
                                                            (UNAUDITED)
<S>                               <C>                <C>
Revenue:
  Base rent......................      $13,723                $11,263
  Recoveries from tenants........        2,976                  2,017
  Garage--net....................        2,175                  1,760
  Other income...................          436                    382
                                       -------                -------
                                        19,310                 15,422
                                       -------                -------
Certain operating expenses (Note
 2)
  Utilities......................        1,578                  1,118
  Janitorial and cleaning........          741                    541
  Security.......................          339                    270
  General and administrative.....          360                    245
  Repairs and maintenance........          683                    470
  Insurance......................          164                    117
  Real estate taxes..............        1,638                  1,219
                                       -------                -------
                                         5,503                  3,980
                                       -------                -------
Excess of revenue over certain
 operating expenses..............      $13,807                $11,442
                                       =======                =======
</TABLE>
 
 
         The accompanying notes are an integral part of the statement.
 
                                      F-47
<PAGE>
 
                               RIVERFRONT PLAZA
                         NOTES TO STATEMENT OF REVENUE
                        OVER CERTAIN OPERATING EXPENSES
 
                            (DOLLARS IN THOUSANDS)
 
1. DESCRIPTION OF THE PROPERTY
 
  The accompanying statement of revenue over certain operating expenses (the
"Statement") includes the operations of an approximately 899,720 square foot
office building located in Richmond, Virginia. The Property will be acquired
by Boston Properties, Inc. from an unrelated third party.
 
2. BASIS OF ACCOUNTING
 
  The accompanying Statement has been prepared on the accrual basis of
accounting. The Statement has been prepared in accordance with Rule 3-14 of
Regulation S-X of the Securities and Exchange Commission for real estate
properties acquired or to be acquired. Accordingly, this statement excludes
certain historical expenses not comparable to the operations of the Property
after acquisition such as amortization, depreciation, property management
fees, certain interest costs, corporate expenses and certain other costs not
directly related to the future operations of the Property.
 
3. SIGNIFICANT ACCOUNTING POLICIES
 
  Rental Revenue
 
  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 revenue by approximately $621 and $143 for the year
ended December 31, 1996, and the nine months ended September 30, 1997
(unaudited), respectively.
 
  Unaudited Interim Information
 
  The statement of revenue over certain operating expenses for the nine months
ended September 30, 1997 is unaudited. In the opinion of management, all
adjustments necessary for a fair presentation of such statement have been
included. The results of operations for the period are not necessarily
indicative of the Property's future results of operations.
 
  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.
 
4. DESCRIPTION OF LEASING ARRANGEMENTS
 
  The commercial and office space is leased to tenants under leases with terms
that vary in length. Certain 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,
                                                      --------------
                                                      (IN THOUSANDS)
        <S>                                           <C>
        1997.........................................    $13,615
        1998.........................................     13,870
        1999.........................................     13,148
        2000.........................................     12,427
        2001.........................................     10,574
        Thereafter...................................     39,718
</TABLE>
 
  As of December 31, 1996, two tenants occupied approximately 55% of the
leasable square feet and represented 56% of total 1996 Base Rent.
 
                                     F-48
<PAGE>

                                   2 Artwork
<PAGE>

                                  [Art Work] 


                     Other Properties Owned by the Company

[Picture of 599 Lexington                   
 Avenue, New York, NY]                      
                                                                               
                                                                               
                                                                               
[Picture of One and Two Independence  [Picture of 8000 Grainger Court,
 Square, Washington, D.C.]             Springfield, Virginia (R&D Property)]
                                                                               
                                                                               
                                                                               
[Picture of Long Wharf Marriott(R)    [Picture of 6201 Columbia Park Road 
 Hotel, Boston, Massachusetts]         Landover, Maryland (Industrial Property)]
<PAGE>
 
For a summary of property, property type, operating and ownership data regarding
the Properties see the "Summary Property Data" table contained herein.
<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
 NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN
CONNECTION WITH THE OFFERING COVERED BY THIS PROSPECTUS. IF GIVEN OR MADE,
SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AU-
THORIZED BY THE COMPANY. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL,
OR A SOLICITATION OF AN OFFER TO BUY, THE COMMON STOCK IN ANY JURISDICTION
WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICI-
TATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS NOT BEEN
ANY CHANGE IN THE FACTS SET FORTH IN THIS PROSPECTUS OR IN THE AFFAIRS OF THE
COMPANY SINCE THE DATE HEREOF.
 
                                ---------------
 
                           SUMMARY TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
Prospectus Summary.......................................................   1
Summary Selected Financial Information...................................  10
Risk Factors.............................................................  12
The Company..............................................................  21
Business and Growth Strategies...........................................  27
Use of Proceeds..........................................................  31
Price Range of Shares and Distribution History...........................  32
Capitalization...........................................................  33
Selected Financial Information...........................................  34
Management's Discussion and Analysis of Financial Condition and Results
 of Operations...........................................................  37
Business and Properties..................................................  44
The Unsecured Line of Credit.............................................  73
Management...............................................................  74
Certain Transactions.....................................................  83
Policies with Respect to Certain Activities..............................  84
Structure and Formation of the Company...................................  87
Operating Partnership Agreement..........................................  91
Principal Stockholders...................................................  95
Description of Capital Stock.............................................  96
Certain Provisions of Delaware Law and the Company's Certificate and
 Bylaws.................................................................. 101
Shares Available for Future Sale......................................... 104
Federal Income Tax Consequences.......................................... 105
Underwriting............................................................. 118
Experts.................................................................. 120
Legal Matters............................................................ 120
Additional Information................................................... 121
Glossary................................................................. 122
Index to Financial Statements............................................ F-1
</TABLE>
 
                                ---------------
 
 UNTIL    , 1998 (25 DAYS AFTER THE COMMENCEMENT OF THIS OFFERING), ALL DEAL-
ERS EFFECTING TRANSACTIONS IN THE SHARES, WHETHER OR NOT PARTICIPATING IN THIS
DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS DELIVERY REQUIRE-
MENT IS IN ADDITION TO THE OBLIGATION OF THE DEALERS TO DELIVER A PROSPECTUS
WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR
SUBSCRIPTIONS.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                               14,000,000 SHARES
 
 
                                     LOGO
 
                            BOSTON PROPERTIES, INC.
 
                                 COMMON STOCK
 
                                ---------------
 
                                  PROSPECTUS
 
                                ---------------
 
                              Joint Lead Managers
                             and Joint Bookrunners
 
                             GOLDMAN, SACHS & CO.
                              MERRILL LYNCH & CO.
 
                                ---------------
 
                           BEAR, STEARNS & CO. INC.
                          MORGAN STANLEY DEAN WITTER
                           PAINEWEBBER INCORPORATED
                      PRUDENTIAL SECURITIES INCORPORATED
                             SALOMON SMITH BARNEY
                             CHASE SECURITIES INC.
 
                                        , 1998
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL NOR  +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                 SUBJECT TO COMPLETION, DATED DECEMBER 3, 1997
 
PROSPECTUS
                               14,000,000 SHARES
                            BOSTON PROPERTIES, INC.
                                                                            LOGO
                                  COMMON STOCK
                                  ----------
 
  Boston Properties, Inc. is one of the largest owners and developers of office
properties in the United States, with a significant presence in Greater Boston,
Greater Washington, D.C. , midtown Manhattan and Baltimore, Maryland. Since the
Company's initial public offering in June 1997 (the "Initial Offering"), the
Company has acquired three office properties; entered into a contract to
acquire a fourth office property expected to close in January 1998; and is
currently developing six properties, consisting of five office properties and
one 221 room hotel. The aggregate anticipated investment since the Initial
Offering for these acquisitions and developments is $969.6 million. The Company
owns 83 properties (including the six properties under development and the
office property under contract) aggregating approximately 16.4 million square
feet. In addition, the Company owns or has options to acquire six parcels of
land that will support approximately 629,000 square feet of development.
 
  The Company was formed to succeed to the real estate development,
redevelopment, acquisition, management, operating and leasing businesses
associated with the predecessor company founded by Mortimer B. Zuckerman and
Edward H. Linde in 1970. Upon completion of this Offering the Company's
management and Board of Directors will own a 24.6% economic interest in the
Company, equal to approximately $570.5 million as of December 1, 1997. The
Company is a fully integrated, self-administered and self-managed real estate
company and expects to qualify as a real estate investment trust ("REIT") for
federal income tax purposes for the year ending December 31, 1997.
 
  All of the shares of the Common Stock offered hereby are being sold by the
Company. Of the 14,000,000 shares of Common Stock being offered hereby,
11,200,000 shares are being offered initially in the United States and Canada
by the U.S. Underwriters and 2,800,000 shares are being offered initially
outside the United States and Canada by the International Managers. See
"Underwriting."
 
  The Common Stock is listed on the New York Stock Exchange (the "NYSE") under
the symbol "BXP." On December 1, 1997, the reported last sale price of the
Common Stock on the NYSE was $33.25 per share.
 
  SEE "RISK FACTORS" BEGINNING ON PAGE 12 FOR CERTAIN FACTORS RELEVANT TO AN
INVESTMENT IN THE COMMON STOCK, INCLUDING:
 . The Company intends to acquire portfolios and individual properties; such
   acquisitions may not achieve intended returns;
 . The Company intends to develop commercial properties and its return on such
   investments can be lower than anticipated because properties can cost more
   to develop, take longer to develop or lease, or lease for lower rent than
   anticipated;
 . Conflicts of interest exist between the Company and Messrs. Zuckerman and
   Linde in connection with the Company's operations, including with respect
   to certain restrictions on the Company's ability to sell or transfer four
   properties until June 23, 2007 without the consent of Messrs. Zuckerman and
   Linde;
 . The Company relies on key personnel whose continued service is not
   guaranteed, including Messrs. Zuckerman and Linde;
 . Real estate investment and property management are risky as rents can
   fluctuate and operating costs can increase; and
 . The Company may not be able to refinance indebtedness on favorable terms,
   and interest rates might increase on amounts drawn under the Company's line
   of credit.
                                  ----------
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  PROSPECTUS.  ANY  REPRESENTATION  TO  THE
   CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                       PRICE TO UNDERWRITING PROCEEDS TO
                                        PUBLIC  DISCOUNT(1)  COMPANY(2)
- ------------------------------------------------------------------------
<S>                                    <C>      <C>          <C>
Per Share.............................   $          $            $
- ------------------------------------------------------------------------
Total(3)..............................  $          $            $
</TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
(1) The Company has agreed to indemnify the several Underwriters against
    certain liabilities, including liabilities under the Securities Act of
    1933, as amended. See "Underwriting."
(2) Before deducting estimated expenses of $     payable by the Company.
(3) The Company has granted the U.S. Underwriters a 30-day option to purchase
    up to an additional 1,680,000 shares of Common Stock, and has granted the
    International Managers a 30-day option to purchase up to an additional
    420,000 shares of Common Stock, on the same terms and conditions as set
    forth above solely to cover overallotments, if any. If such options are
    exercised in full, the total Price to Public, Underwriting Discount and
    Proceeds to Company will be $    , $     and $    , respectively. See
    "Underwriting."
                                  ----------
  The shares of Common Stock are offered by the several Underwriters, subject
to prior sale, when, as and if issued and accepted by them, subject to approval
of certain legal maters by counsel for the Underwriters. The Underwriters
reserve the right to withdraw, cancel or modify such offer and to reject orders
in whole or in part. It is expected that delivery of the shares will be made in
New York, New York on or about     , 1998.
                                  ----------
                   Joint Lead Managers and Joint Bookrunners
GOLDMAN SACHS INTERNATIONAL__________________________MERRILL LYNCH INTERNATIONAL
                                  ----------
BEAR, STEARNS INTERNATIONAL LIMITED
   MORGAN STANLEY DEAN WITTER
      PAINEWEBBER INCORPORATED
          PRUDENTIAL-BACHE SECURITIES
             SALOMON SMITH BARNEY INTERNATIONAL
                                           CHASE MANHATTAN INTERNATIONAL LIMITED
                                  ----------
                 The date of this Prospectus is         , 1998.
<PAGE>
 
                                 UNDERWRITING
 
  Subject to the terms and conditions in the international purchase agreement
(the "International Purchase Agreement"), among the Company and each of the
underwriters named below (the "International Managers"), and concurrently with
the sale of 11,200,000 shares to the U.S. Underwriters (as defined below), the
Company has agreed to sell to each of the International Managers, for whom
Goldman Sachs International, Merrill Lynch International, Bear, Stearns
International Limited, Morgan Stanley & Co. International Limited, PaineWebber
International (UK) Ltd., Prudential-Bache Securities (U.K.) Inc., Smith Barney
Inc. and Chase Manhattan International Limited are acting as lead managers
(the "Lead Managers"), and each of the International Managers has severally
agreed to purchase from the Company, the respective number of shares of Common
Stock set forth opposite their respective names:
 
<TABLE>
<CAPTION>
                                                                        NUMBER
                                                                          OF
           UNDERWRITER                                                  SHARES
           -----------                                                 ---------
      <S>                                                              <C>
      Goldman Sachs International.....................................
      Merrill Lynch International.....................................
      Bear, Stearns International Limited.............................
      Morgan Stanley & Co. International Limited......................
      PaineWebber International (UK) Ltd. ............................
      Prudential-Bache Securities (U.K.) Inc. ........................
      Smith Barney Inc. ..............................................
      Chase Manhattan International Limited...........................
                                                                       ---------
           Total...................................................... 2,800,000
                                                                       =========
</TABLE>
 
  The Company has also entered into a purchase agreement (the "U.S. Purchase
Agreement" and, together with the International Purchase Agreement, the
"Purchase Agreements") with certain underwriters in the United States and
Canada (the "U.S. Underwriters" and, together with the International
Underwriters, the "Underwriters") for whom Goldman, Sachs & Co., Merrill
Lynch, Pierce, Fenner & Smith Incorporated, Bear, Stearns & Co. Inc., Morgan
Stanley & Co. Incorporated, PaineWebber Incorporated, Prudential Securities
Incorporated, Smith Barney Inc. and Chase Securities Inc. are acting as
representatives. Subject to the terms and conditions set forth in the U.S.
Purchase Agreement and concurrently with the sale of 2,800,000 shares of
Common Stock to the International Managers pursuant to the International
Purchase Agreement, the Company has agreed to sell to the U.S. Underwriters,
and the U.S. Underwriters have severally agreed to purchase from the Company,
an aggregate of 11,200,000 shares of Common Stock. The public offering price
per share and the total underwriting discount per share are identical under
the U.S. Purchase Agreement and the International Purchase Agreement.
 
  In each Purchase Agreement, the several U.S. Underwriters and the several
International Managers have agreed, respectively, subject to the terms and
conditions set forth in such Purchase Agreement, to purchase all of the shares
of Common Stock being sold pursuant to such Purchase Agreement if any of such
shares of Common Stock are purchased. Under certain circumstances, the
commitments of non-defaulting U.S. Underwriters or International Managers (as
the case may be) may be increased. The sale of shares of Common Stock pursuant
to the U.S. Purchase Agreement and the International Purchase Agreement are
conditioned upon each other.
 
  The Lead Managers have advised the Company that the International Managers
propose to offer the Common Stock to the public at the public offering price
set forth on the cover page of this Prospectus and to certain banks, brokers
and dealers (the "Selling Group") at such price less a concession not in
excess of $  per share. The International Managers may allow, and such dealers
may re-allow with the consent of Goldman Sachs International, a discount not
in excess of $  per share on sales to certain other International Managers and
members of the Selling Group. After the date of this Prospectus, the public
offering price and concession and discount may be changed.
 
  The Company has been informed that the U.S. Underwriters and the
International Managers have entered into an agreement (the "Intersyndicate
Agreement") providing for the coordination of their activities. Under the
terms of the Intersyndicate Agreement, the U.S. Underwriters and the
International Managers are permitted to
 
                                      118
<PAGE>
 
sell shares of Common Stock to each other for purposes of resale at the public
offering price, less an amount not greater than the selling concession. Under
the terms of the Intersyndicate Agreement, the International Managers and any
dealer to whom they sell shares of Common Stock will not offer to sell or sell
shares of Common Stock to persons who are United States persons or Canadian
persons or to persons they believe intend to resell to persons who are United
States persons or Canadian persons, and the U.S. Underwriters and any dealer to
whom they sell shares of Common Stock will not offer to sell or sell shares of
Common Stock to persons who are non-United States and non-Canadian persons or
to persons they believe intend to resell to non-United States and non-Canadian
persons, except in each case for transactions pursuant to such agreement.
 
  The Company has granted to the International Managers an option, exercisable
for 30 days after the date of this Prospectus, to purchase up to 420,000
additional shares of Common Stock to cover overallotments, if any, at the
public offering price, less the underwriting discount set forth on the cover
page of this Prospectus. If the International Managers exercise this option,
each International Manager will have a firm commitment, subject to certain
conditions, to purchase approximately the same percentage thereof which the
number of shares of Common Stock to be purchased by it shown in the foregoing
table bears to such International Managers' initial amount reflected in the
foregoing table. The Company also has granted an option to the U.S.
Underwriters, exercisable during the 30-day period after the date of this
Prospectus, to purchase up to 1,680,000 additional shares of Common Stock to
cover overallotments, if any, on terms similar to those granted to the
International Managers.
 
  In the Purchase Agreements, the Company has agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act.
 
  The Company, the Operating Partnership and certain persons who owned
interests in one or more of the Properties prior to the Initial Offering and
who received OP Units in exchange for such interests in the Formation
Transactions (the "Non-Affiliated Participants") have agreed, subject to
certain exceptions, not to sell, offer or contract to sell, grant any option
for the sale of, or otherwise dispose of any shares of Common Stock or OP
Units, or any securities convertible into or exchangeable for Common Stock or
OP Units, for a period of one year from June 1997, without the prior written
consent of Goldman, Sachs & Co. and Merrill Lynch, Pierce, Fenner & Smith
Incorporated. The Company has granted certain registration rights pursuant to
which the Non-Affiliated Participants may require the Company to file a
registration statement with the Securities and Exchange Commission with respect
to sales of any shares received by the Non-Affiliated Participants in exchange
for their OP Units after the expiration of the one-year period.
 
  Messrs. Zuckerman and Linde and the senior officers of the Company who
received OP Units and/or shares of Common Stock in the Formation Transactions
have agreed, subject to certain exceptions, not to sell, offer or contract to
sell, grant any option for the sale of, or otherwise dispose of any shares of
Common Stock or OP Units for a period of two years from June 1997, without the
prior written consent of Goldman, Sachs & Co. and Merrill Lynch, Pierce, Fenner
& Smith Incorporated.
 
  Each of the Company and the International Managers has represented and agreed
that (a) it has not offered or sold, and prior to the date six months after the
date of this Prospectus will not offer or sell any Shares of Common Stock to
persons in the United Kingdom except to persons whose ordinary activities
involve them in acquiring, holding, managing or disposing of investments (as
principal or agent) for the purpose of their businesses or otherwise in
circumstances which do not constitute an offer to the public in the United
Kingdom for the purposes of the Public Offers of Securities Regulations 1995,
(b) it has complied and will comply with all applicable provisions of the
Financial Services Act 1986 with respect to anything done by it in relation to
the shares of Common Stock in, from or otherwise the United Kingdom and (c) it
has only issued or passed on and will only issue or pass on in the United
Kingdom any document received by it in connection with the issue or sale of the
Common Stock to a person who is of a kind described in Article II(3) of the
Financial Services Act 1986 (Investment Advertisements) (Exemptions) Order 1995
or is a person to whom the document may otherwise lawfully be issued or passed
on.
 
  Until the distribution of the Common Stock is completed, rules of the
Securities and Exchange Commission may limit the ability of the Underwriters
and certain selling group members to bid for and purchase the Common
 
                                      119
<PAGE>
 
Stock. As an exception to these rules, the U.S. Representatives are permitted
to engage in certain transactions that stabilize the price of the Common Stock.
Such transactions consist of bids or purchases for the purpose of pegging,
fixing or maintaining the price of the Common Stock.
 
  If the Underwriters create a short position in the Common Stock in connection
with this Offering, i.e., if they sell more shares of Common Stock than are set
forth on the cover page of this Prospectus, the U.S. Representatives and the
International Managers, respectively, may reduce that short position by
purchasing Common Stock in the open market. The U.S. Representatives and the
International Managers, respectively, may also elect to reduce any short
position by exercising all or part of the over-allotment option described
above.
 
  The U.S. Representatives and the International Managers, respectively, may
also impose a penalty bid on certain Underwriters and selling group members.
This means that if the U.S. Representatives or the International Managers
purchase shares of Common Stock in the open market to reduce the Underwriters'
short position or to stabilize the price of the Common Stock, they may reclaim
the amount of the selling concession from the Underwriters and selling group
members who sold those shares as part of this Offering.
 
  In general, purchases of a security for the purpose of stabilization or to
reduce a short position could cause the price of the security to be higher than
it might be in the absence of such purchases. The imposition of a penalty bid
might also have an effect on the price of a security to the extent that it were
to discourage resales of the security.
 
  Neither the Company nor any of the Underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of the Common Stock. In addition, none of
the Underwriters makes any representation that the U.S. Representatives or the
International Managers will engage in such transactions or that such
transactions, once commenced, will not be discontinued without notice.
 
                                    EXPERTS
 
  The combined historical financial statements and financial statement schedule
of the Boston Properties Predecessor Group included in this Prospectus and the
Registration Statement of which this Prospectus is a part, to the extent and
for the periods indicated in their reports and the Statements of Revenue over
Certain Operating Expenses of 280 Park Avenue, 100 East Pratt Street, 875 Third
Avenue and Riverfront Plaza for the year ended December 31, 1996, have been
audited by Coopers & Lybrand L.L.P., independent accountants, and are included
herein in reliance upon the authority of such firm as experts in accounting and
auditing.
 
  In addition, certain statistical information provided under the captions
"Prospectus Summary--The Properties" and "Business and Properties" has been
prepared by Spaulding & Slye, and is included herein in reliance upon the
authority of such firm as expert in, among other things, office and industrial
real estate market conditions.
 
                                 LEGAL MATTERS
 
  Certain legal matters, including the validity of the shares of Common Stock
offered hereby, will be passed upon for the Company by Goodwin, Procter & Hoar
LLP. In addition, the description of federal income tax consequences contained
in this Prospectus under the heading "Federal Income Tax Consequences" is based
upon the opinion of Goodwin, Procter & Hoar LLP. Gilbert G. Menna, the sole
shareholder of Gilbert G. Menna, P.C., a partner of Goodwin, Procter & Hoar
llp, serves as an Assistant Secretary of the Company. Certain partners of
Goodwin, Procter & Hoar LLP or their affiliates, together with Mr. Menna, own
approximately 20,000 shares of Common Stock. Goodwin, Procter & Hoar llp
occupies approximately 26,000 square feet at 599 Lexington Avenue under a lease
with the Company that expires in 2002.
 
  Certain legal matters will be passed upon for the Underwriters by Skadden,
Arps, Slate, Meagher & Flom LLP.
 
                                      120
<PAGE>
 
                             ADDITIONAL INFORMATION
 
  The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-11 (of which this Prospectus
is a part) under the Securities Act with respect to the securities offered
hereby. This Prospectus does not contain all information set forth in the
Registration Statement, certain portions of which have been omitted as
permitted by the rules and regulations of the Commission. Statements contained
in this Prospectus as to the content of any contract or other document are not
necessarily complete, and in each instance reference is made to the copy of
such contract or other document filed as an exhibit to the Registration
Statement, each such statement being qualified in all respects by such
reference and the exhibits and schedules hereto. For further information
regarding the Company and the Common Stock offered hereby, reference is hereby
made to the Registration Statement and such exhibits and schedules, which may
be obtained from the Commission as its principal office at 450 Fifth Street,
Northwest, Washington, D.C. 20549, upon payment of the fees prescribed by the
Commission. The Commission maintains a website at http://www.sec.gov containing
reports, proxy and information statements and other information regarding
registrants, including the Company, that file electronically with the
Commission.
 
  Statements contained in this Prospectus as to the contents of any contract or
other document that is filed as an exhibit to the Registration Statement are
not necessarily complete, and each such statement is qualified in its entirety
by reference to the full text of such contract or document.
 
  The Company is required to file reports and other information with the
Commission pursuant to the Securities Exchange Act of 1934. In addition to
applicable legal or NYSE requirements, if any, holders of Common Shares will
receive annual reports containing audited financial statements with a report
thereon by the Company's independent certified public accounts, and quarterly
reports containing unaudited financial information for each of the first three
quarters of each fiscal year.
 
                                      121
<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
 NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN
CONNECTION WITH THE OFFERING COVERED BY THIS PROSPECTUS. IF GIVEN OR MADE,
SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AU-
THORIZED BY THE COMPANY. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL,
OR A SOLICITATION OF AN OFFER TO BUY, THE COMMON STOCK IN ANY JURISDICTION
WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICI-
TATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS NOT BEEN
ANY CHANGE IN THE FACTS SET FORTH IN THIS PROSPECTUS OR IN THE AFFAIRS OF THE
COMPANY SINCE THE DATE HEREOF.
 
                                ---------------
 
                           SUMMARY TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
Prospectus Summary.......................................................   1
Summary Selected Financial Information...................................  10
Risk Factors.............................................................  12
The Company..............................................................  21
Business and Growth Strategies...........................................  27
Use of Proceeds..........................................................  31
Price Range of Shares and Distribution History...........................  32
Capitalization...........................................................  33
Selected Financial Information...........................................  34
Management's Discussion and Analysis of Financial Condition and Results
 of Operations...........................................................  37
Business and Properties..................................................  44
The Unsecured Line of Credit.............................................  73
Management...............................................................  74
Certain Transactions.....................................................  83
Policies with Respect to Certain Activities..............................  84
Structure and Formation of the Company...................................  87
Operating Partnership Agreement..........................................  91
Principal Stockholders...................................................  95
Description of Capital Stock.............................................  96
Certain Provisions of Delaware Law and the Company's Certificate and
 Bylaws.................................................................. 101
Shares Available for Future Sale......................................... 104
Federal Income Tax Consequences.......................................... 105
Underwriting............................................................. 118
Experts.................................................................. 120
Legal Matters............................................................ 120
Additional Information................................................... 121
Glossary................................................................. 122
Index to Financial Statements............................................ F-1
</TABLE>
 
                                ---------------
 
 UNTIL    , 1998 (25 DAYS AFTER THE COMMENCEMENT OF THIS OFFERING), ALL DEAL-
ERS EFFECTING TRANSACTIONS IN THE SHARES, WHETHER OR NOT PARTICIPATING IN THIS
DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS DELIVERY REQUIRE-
MENT IS IN ADDITION TO THE OBLIGATION OF THE DEALERS TO DELIVER A PROSPECTUS
WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR
SUBSCRIPTIONS.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                               14,000,000 SHARES
 
 
                                     LOGO
 
                            BOSTON PROPERTIES, INC.
 
                                 COMMON STOCK
 
                                ---------------
 
                                  PROSPECTUS
 
                                ---------------
 
                              Joint Lead Managers
                             and Joint Bookrunners
 
                          GOLDMAN SACHS INTERNATIONAL
                          MERRILL LYNCH INTERNATIONAL
 
                                ---------------
 
                      BEAR, STEARNS INTERNATIONAL LIMITED
                          MORGAN STANLEY DEAN WITTER
                           PAINEWEBBER INCORPORATED
                          PRUDENTIAL-BACHE SECURITIES
                      SALOMON SMITH BARNEY INTERNATIONAL
                     CHASE MANHATTAN INTERNATIONAL LIMITED
 
                                        , 1998
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 30. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
  The following table itemizes the expenses incurred by the Company in
connection with the offering of the shares of Common Stock being registered
hereby. All of the amounts shown are estimates, except the Securities and
Exchange Commission Registration Fee.
 
<TABLE>
<CAPTION>
                                   ITEM                                AMOUNT
                                   ----                              ----------
      <S>                                                            <C>
      Securities and Exchange Commission Registration Fee........... $  157,000
      NASD Fee......................................................     30,500
      New York Stock Exchange Listing Fee...........................     49,000
      Transfer Agent's and Registrar's Fees.........................      2,500
      Printing Fees.................................................    300,000
      Legal Fees and Expenses (other than Blue Sky).................    175,000
      Accounting Fees and Expenses..................................    200,000
      Blue Sky Fees and Expenses (including fees of counsel)........     20,000
      Miscellaneous Expenses........................................    270,000
                                                                     ----------
        Total....................................................... $1,204,000
                                                                     ==========
</TABLE>
 
ITEM 31. SALES TO SPECIAL PARTIES.
 
  See Item 32.
 
ITEM 32. RECENT SALES OF UNREGISTERED SECURITIES.
 
  On April 8, 1997, the Operating Partnership was formed with Boston
Properties, Inc., a Massachusetts Corporation ("BP-Massachusetts"), as general
partner and an affiliate as a limited partner. The sale of the interests in
the Operating Partnership was made in reliance on Section 4(2) of the
Securities Act of 1933, as amended (the "Securities Act").
 
  On April 9 and 15, 1997, the Company entered into an Omnibus Option
Agreement (or, in the case of one entity, a similar agreement) with a total of
80 individuals (the "Individuals") and entities ("Entities") (including
entities such as trusts or limited partnerships in which one or more of the
Individuals may have the primary economic or a controlling interest). None of
the Entities was formed for the purpose of entering into the Omnibus Option
Agreement and acquiring OP Units. Such agreement provides that the Operating
Partnership can, at its option and without any further action by such
Individuals or Entities, acquire all or any of the interests of the
Individuals or Entities in the 74 Properties (collectively, the "Interests").
The right of the Operating Partnership to acquire all or any of the Interests
from the Individuals and Entities and to issue OP Units in exchange therefor
is subject only to the fulfillment of conditions (principally, the completion
of the Offering) beyond the control of the Individuals and Entities. The total
number of OP Units that will be issued to the Individuals and Entities will
depend on the final offering price of a share of Common Stock in the Offering.
Such agreement was entered into and will be consummated in reliance on Section
4(2) of, and Regulation D under, the Securities Act.
 
  On April 11, 1997, BP-Massachusetts and Boston Properties, Inc., a Delaware
corporation ("BP-Delaware"), and the Operating Partnership, entered into a
number of agreements (including a merger agreement and a contribution
agreement) that memorializes (i) the issuance of Common Stock by BP-Delaware
to the stockholders of BP-Massachusetts (Messrs. Zuckerman and Linde) upon
consummation of a reincorporation merger in connection with the Formation
Transactions and (ii) the contribution to the Operating Partnership of
 
                                     II-1
<PAGE>
 
the proceeds of the Offering and the management and development operations
currently held by BP-Massachusetts. Such agreements were entered into and will
be consummated in reliance on Section 4(2) of the Securities Act.
 
  On September 2, 1997, the Operating Partnership and the Company entered into
a Contribution Agreement with Kenvic Associates, a New York general
partnership, pursuant to which the Operating Partnership agreed to acquire all
of Kenvic Associates' right, title and interest in and to 875 Third Avenue,
New York, New York, in exchange for the issuance by the Operating Partnership
of 890,869 OP Units, subject to adjustment based on the average closing price
of the Common Stock for the ten trading days prior to and including December
31, 1998. The Operating Partnership acquired 875 Third Avenue and issued
890,869 OP Units to Kenvic Associates on November 21, 1997.
 
  On October 23, 1997, in connection with the Company's acquisition of 100
East Pratt Street, the Company Partnership issued 500 shares of Common Stock
to International Business Machines Corporation, one of the sellers of the
Property.
 
ITEM 33. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
  The Company's Certificate, as amended, and Bylaws provide certain
limitations on the liability of the Company's directors and officers for
monetary damages to the Company. The Certificate and Bylaws obligate the
Company to indemnify its directors and officers, and permit the Company to
indemnify its employees and other agents, against certain liabilities incurred
in connection with their service in such capacities. These provisions could
reduce the legal remedies available to the Company and the stockholders
against these individuals. See "Certain Provisions of Delaware Law and The
Company's Certificate and Bylaws--Limitation of Liability and
Indemnification."
 
  The Company's Certificate limits the liability of the Company's directors
and officers to the Company to the fullest extent permitted from time to time
by Delaware law. The DGCL permits, but does not require, a corporation to
indemnify its directors, officers, employees or agents and expressly provides
that the indemnification provided for under the DGCL shall not be deemed
exclusive of any indemnification right under any bylaw, vote of stockholders
or disinterested directors, or otherwise. The DGCL permits indemnification
against expenses and certain other liabilities arising out of legal actions
brought or threatened against such persons for their conduct on behalf of the
corporation, provided that each such person acted in good faith and in a
manner that he reasonably believed was in or not opposed to the corporation's
best interests and in the case of a criminal proceeding, had no reasonable
cause to believe his or her conduct was unlawful. The DGCL does not allow
indemnification of directors in the case of an action by or in the right of
the corporation (including stockholder derivative suits) unless the directors
successfully defend the action or indemnification is ordered by the court.
 
  The Company has entered into indemnification agreements with each of its
directors and executive officers. The indemnification agreements require,
among other matters, that the Company indemnify its directors and officers to
the fullest extent permitted by law and advance to the directors and officers
all related expenses, subject to reimbursement if it is subsequently
determined that indemnification is not permitted. Under these agreements, the
Company must also indemnify and advance all expenses incurred by directors and
officers seeking to enforce their rights under the indemnification agreements
and may cover directors and officers under the Company's directors' and
officers' liability insurance. Although the form of indemnification agreement
offers substantially the same scope of coverage afforded by law, it provides
additional assurance to directors and officers that indemnification will be
available because, as a contract, it cannot be modified unilaterally in the
future by the Board of Directors or the Stockholders to eliminate the rights
it provides. It is the position of the SEC that indemnification of directors
and officers for liabilities under the Securities Act of 1933, as amended (the
"Securities Act") is against public policy and unenforceable pursuant to
Section 14 of the Securities Act.
 
ITEM 34. TREATMENT OF PROCEEDS FROM STOCK BEING REGISTERED.
 
  Not applicable.
 
ITEM 35. FINANCIAL STATEMENTS AND EXHIBITS.
 
  (b) Exhibits. The following is a complete list of Exhibits filed or
incorporated by reference as part of this Registration Statement.
 
 
                                     II-2
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT NO.                             DESCRIPTION
 -----------                             -----------
 <C>         <S>
     +1.1    --Form of U.S. Purchase Agreement
     +1.2    --Form of International Purchase Agreement
     *3.1    --Form of Amended and Restated Certificate of Incorporation of the
              Company
     *3.2    --Form of Amended and Restated Bylaws of the Company
     *4.1    --Form of Shareholder Rights Agreement dated as of June   , 1997
              between the Company and BankBoston, N.A., as Rights Agent.
     *4.2    --Form of Certificate of Designation for Series E Junior
              Participating Cumulative Preferred Stock, par value $.01 per
              share
     *4.3    --Form of Common Stock Certificate
     +5.1    --Opinion of Goodwin, Procter & Hoar LLP regarding legality of the
              shares of the Common Stock issued
     +8.1    --Opinion of Goodwin, Procter & Hoar LLP regarding tax matters
    *10.1    --Form of Amended and Restated Agreement of Limited Partnership of
              the Operating Partnership
    *10.2    --1997 Stock Option and Incentive Plan
    *10.3    --Form of Noncompetition Agreement between the Company and
              Mortimer B. Zuckerman
    *10.4    --Form of Employment and Noncompetition Agreement between the
              Company and Edward H. Linde
    *10.5    --Form of Employment Agreement between the Company and certain
              executive officers
    *10.6    --Form of Indemnification Agreement between the Company and each
              of its directors and executive officers
    *10.7    --Omnibus Option Agreement by and among Boston Properties Limited
              Partnership (the "Operating Partnership") and the Grantors named
              therein dated as of April 9, 1997
    *10.8    --Revolving Credit Agreement with BankBoston, N.A.
    *10.9    --Form of Registration Rights Agreement among the Company and the
              persons named therein
   *10.10    --Form of Lease Agreement dated as of June  , 1997 between Edward
              H. Linde and Mortimer B. Zuckerman, as Trustees of Downtown
              Boston Properties Trust, and ZL Hotel LLC
   *10.11    --Form of Lease Agreement dated as of June  , 1997 between Edward
              H. Linde and Mortimer B. Zuckerman, as Trustees of Two Cambridge
              Center Trust, and ZL Hotel LLC
   *10.12    --Option Agreement between Boston Properties Limited Partnership
              and Square 36 Properties Limited Partnership dated April 15, 1997
   *10.13    --Form of Certificate of Incorporation of Boston Properties
              Management, Inc.
   *10.14    --Form of By-laws of Boston Properties Management, Inc.
   *10.15    --Form of Limited Liability Agreement of ZL Hotel LLC
   *10.16    --Form of Option Agreement to Acquire the Property known as Sumner
              Square
   *10.17    --Loan Modification Agreement between Lexreal Associates and
              Mitsui Seimei America Corporation relating to loan secured by 599
              Lexington Avenue
   *10.18    --Loan Modification and Extension Agreement by and between
              Southwest Market Limited Partnership, a District of Columbia
              limited partnership, Mortimer B. Zuckerman and Edward H. Linde
              and the Sumitomo Bank, Limited, for One Independence Square,
              dated as of September 26, 1994
   *10.19    --Loan Modification and Extension Agreement by and among Southwest
              Market Limited Partnership, a District of Columbia limited
              partnership, Mortimer B. Zuckerman and Edward H. Linde and the
              Sumitomo Bank, Limited, for Two Independence Square, dated as of
              September 26, 1994
   *10.20    --Construction Loan Agreement by and between the Sumitomo Bank,
              Limited and Southwest Market Limited Partnership, dated as of
              August 21, 1990
   *10.21    --Construction Loan Agreement by and between the Sumitomo Bank,
              Limited and Southwest Market Limited Partnership for Two
              Independence Square, dated as of February 22, 1991
   *10.22    --Consent and Loan Modification Agreement regarding One
              Independence Square between the Sumitomo Bank, Limited and
              Southwest Market Limited Partnership dated as of June  , 1997
   *10.23    --Consent and Loan Modification Agreement regarding Two
              Independence Square between the Sumitomo Bank, Limited and
              Southwest Market Limited Partnership dated as of June  , 1997
   *10.24    --Form of Amended and Restated Loan Agreement between Square 36
              Office Joint Venture and the Sanwa Bank Limited dated as of June
               , 1997
   *10.25    --Indemnification Agreement between Boston Properties Limited
              Partnership and Mortimer B. Zuckerman and Edward H. Linde
</TABLE>
 
                                      II-3
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT NO.                             DESCRIPTION
 -----------                             -----------
 <C>         <S>
    *10.26   --Compensation Agreement between the Company and Robert Selsam,
              dated as of August 10, 1995 relating to 90 Church Street
     10.27   --Contribution Agreement dated as of September 2, 1997 by and
              among the Operating Partnership, the Company and Kenvic
              Associates.
     10.28   --Lock-Up and Registration Rights Agreement dated November 21,
              1997 by and among the Operating Partnership, the Company and
              Kenvic Associates.
     10.29   --Agreement dated November 21, 1997 by and between the Operating
              Partnership and Kenvic Associates.
     10.30   --Note and Mortgage Modification and Spreader Agreement between
              John Hancock, as lender and Boston Properties Limited
              Partnership, as borrower.
  (2)10.31   --Agreement between Bankers Trust Company as seller and Boston
              Properties Limited Partnership, as purchaser, dated September 11,
              1997
  (1)10.32   --Term loan agreement between Chase Manhattan Bank, as lender and
              Boston Properties Limited Partnership, as borrower, dated
              September 11, 1997
  (1)10.33   --Interest Guarantee and Agreement between Chase Manhattan Bank,
              as lender and Boston Properties Limited Partnership, as borrower,
              dated September 11, 1997
  (1)10.34   --Net Cash Flow Shortfall Guarantee and Agreement between Chase
              Manhattan Bank, as lender and Boston Properties Limited
              Partnership, as borrower, dated September 11, 1997
  (1)10.35   --Hazardous Material Guaranty and Indemnification Agreement
              between Chase Manhattan Bank, as lender and Boston Properties
              Limited Partnership, as borrower, dated September 11, 1997
  (2)10.36   --Swap Transaction Agreement between the Chase Manhattan Bank and
              Boston Properties, Inc. dated November 4, 1997
  (3)10.37   --Amended and Restated Real Estate Purchase and Sale Contract
              Between International Business Machines Corporation, as seller,
              and Boston Properties Limited Partnership, as buyer, dated
              October 20, 1997
  (4)10.38   --First Amendment to Revolving Credit Agreement dated July 29,
              1997 by and among the Company, BankBoston, N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
  (4)10.39   --Second Amendment to Revolving Credit Agreement dated July 30,
              1997 by and among the Company, BankBoston, N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
  (4)10.40   --Third Amendment to Revolving Credit Agreement dated September
              11, 1997 by and among the Company, BankBoston N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
  (4)10.41   --Fourth Amendment to Revolving Credit Agreement dated October 31,
              1997 by and among the Company, BankBoston, N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
     10.42   --Environmental Indemnity and Agreement made by Boston Properties
              Limited Partnership in favor of John Hancock Mutual Life
              Insurance Company.
     10.43   --Indemnification Agreement made by Boston Properties Limited
              Partnership in favor of John Hancock Mutual Life Insurance
              Company.
     +21.1   --Schedule of Subsidiaries of the Company
      23.1   --Consent of Coopers & Lybrand, L.L.P.
      23.2   --Consent of Spaulding & Slye
      23.3   --Consent of Insignia/Edward S. Gordon Co., Inc.
      23.4   --Consent of Pinnacle Advisory Group
      23.5   --Consent of Colliers Pinkard
      23.6   --Consent of Harrison & Bates
      23.7   --Consent of Landauer Hospitality Group
     +23.8   --Consent of Goodwin, Procter & Hoar llp (included in Exhibits 5.1
              and 8.1)
</TABLE>
- --------
*Incorporated herein by reference to the Company's Registration Statement on
   Form S-11 (No. 333-25279)
+To be filed by amendment.
(1) Incorporated herein by reference to the Company's Current Report on Form
    8-K/A filed November 14, 1997.
(2) Incorporated herein by reference to the Company's Current Report on Form
    8-K/A-2 filed November 25, 1997.
(3) Incorporated herein by reference to the Company's Current Report on Form
    8-K/A filed November 14, 1997.
(4)Incorporated herein by reference to the Company's Current Report on Form 8-
K filed November 26, 1997.
 
                                     II-4
<PAGE>
 
ITEM 36. UNDERTAKINGS.
 
  (a) Insofar as indemnification for liabilities arising under the Securities
Act 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 Securities
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
Securities Act and will be governed by the final adjudication of such issue.
 
  (b) The undersigned registrant hereby undertakes to provide to the
underwriter at the closing specified in the underwriting agreements,
certificates in such denominations and registered in such names as required by
the underwriter to permit prompt delivery to each purchaser.
 
  (c) The undersigned Registrant hereby undertakes that:
 
    (1) For purposes of determining any liability under the Securities Act of
  1933, the information omitted from the form of prospectus filed as part of
  this Registration Statement in reliance upon Rule 430A and contained in a
  form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
  (4) or 497(h) under the Securities Act shall be deemed to be part of this
  Registration Statement as of the time it was declared effective.
 
    (2) For the purposes of determining any liability under the Securities
  Act of 1933, each post-effective amendment that contains a form of
  prospectus 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.
 
                                     II-5
<PAGE>
 
                                  SIGNATURES
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, BOSTON
PROPERTIES, INC. CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT
MEETS ALL OF THE REQUIREMENTS FOR FILING ON FORM S-11 AND HAS DULY CAUSED THIS
REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED,
THEREUNTO DULY AUTHORIZED, IN THE CITY OF BOSTON, THE COMMONWEALTH OF
MASSACHUSETTS, ON THIS 3RD DAY OF DECEMBER, 1997.
 
                                          Boston Properties, Inc.
 
                                                    /s/ Edward H. Linde
                                          By: _________________________________
                                            NAME: EDWARD H. LINDE
                                            TITLE: PRESIDENT AND CHIEF
                                                 EXECUTIVE OFFICER
 
  KNOW ALL MEN BY THESE PRESENTS THAT EACH INDIVIDUAL WHOSE SIGNATURE APPEARS
BELOW CONSTITUTES AND APPOINTS EACH OF MORTIMER B. ZUCKERMAN, EDWARD H. LINDE
AND DAVID G. GAW AS SUCH PERSON'S TRUE AND LAWFUL ATTORNEY-IN-FACT AND AGENT
WITH FULL POWER OF SUBSTITUTION AND RESUBSTITUTION, FOR SUCH PERSON IN SUCH
PERSON'S NAME, PLACE AND STEAD, IN ANY AND ALL CAPACITIES, TO SIGN ANY AND ALL
AMENDMENTS (INCLUDING POST-EFFECTIVE AMENDMENTS) TO THIS REGISTRATION
STATEMENT (OR ANY REGISTRATION STATEMENT FOR THE SAME OFFERING THAT IS TO BE
EFFECTIVE UPON FILING PURSUANT TO RULE 462(B) UNDER THE SECURITIES ACT OF
1933), AND TO FILE THE SAME, WITH ALL EXHIBITS THERETO, AND ALL DOCUMENTS IN
CONNECTION THEREWITH, WITH THE SECURITIES AND EXCHANGE COMMISSION, GRANTING
UNTO EACH SAID ATTORNEY-IN-FACT AND AGENT FULL POWER AND AUTHORITY TO DO AND
PERFORM EACH AND EVERY ACT AND THING REQUISITE AND NECESSARY TO BE DONE IN AND
ABOUT THE PREMISES, AS FULLY TO ALL INTENTS AND PURPOSES AS SUCH PERSON MIGHT
OR COULD DO IN PERSON, HEREBY RATIFYING AND CONFIRMING ALL THAT ANY SAID
ATTORNEY-IN-FACT AND AGENT, OR ANY SUBSTITUTE OR SUBSTITUTES OF ANY OF THEM,
MAY LAWFULLY 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 AND ON THE DATES INDICATED.
 
              SIGNATURE                        TITLE                 DATE
              ---------                        -----                 ----
 
      /s/ Mortimer B. Zuckerman        Chairman of the           December 3,
- -------------------------------------   Board of Directors           1997
        MORTIMER B. ZUCKERMAN
 
         /s/ Edward H. Linde           President and Chief       December 3,
- -------------------------------------   Executive Officer,           1997
           EDWARD H. LINDE              Director (Principal
                                        Executive Officer)
 
          /s/ David G. Gaw             Chief Financial           December 3,
- -------------------------------------   Officer (Principal           1997
            DAVID G. GAW                Financial Officer
                                        and Principal
                                        Accounting Officer)
 
        /s/ Alan J. Patricof           Director                  December 3,
- -------------------------------------                                1997
          ALAN J. PATRICOF
 
                                     II-6
<PAGE>
 
             SIGNATURE                       TITLE                  DATE
             ---------                       -----                  ----
 
       /s/ Ivan G. Seidenberg         Director                December 3, 1997
- ------------------------------------
         IVAN G. SEIDENBERG
 
         /s/ Martin Turchin           Director                December 3, 1997
- ------------------------------------
           MARTIN TURCHIN
 
                                      II-7
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT NO.                             DESCRIPTION
 -----------                             -----------
 <C>         <S>
     +1.1    --Form of U.S. Purchase Agreement
     +1.2    --Form of International Purchase Agreement
     *3.1    --Form of Amended and Restated Certificate of Incorporation of the
              Company
     *3.2    --Form of Amended and Restated Bylaws of the Company
     *4.1    --Form of Shareholder Rights Agreement dated as of June   , 1997
              between the Company and BankBoston, N.A., as Rights Agent.
     *4.2    --Form of Certificate of Designation for Series E Junior
              Participating Cumulative Preferred Stock, par value $.01 per
              share
     *4.3    --Form of Common Stock Certificate
     +5.1    --Opinion of Goodwin, Procter & Hoar LLP regarding legality of the
              shares of the Common Stock issued
     +8.1    --Opinion of Goodwin, Procter & Hoar LLP regarding tax matters
    *10.1    --Form of Amended and Restated Agreement of Limited Partnership of
              the Operating Partnership
    *10.2    --1997 Stock Option and Incentive Plan
    *10.3    --Form of Noncompetition Agreement between the Company and
              Mortimer B. Zuckerman
    *10.4    --Form of Employment and Noncompetition Agreement between the
              Company and Edward H. Linde
    *10.5    --Form of Employment Agreement between the Company and certain
              executive officers
    *10.6    --Form of Indemnification Agreement between the Company and each
              of its directors and executive officers
    *10.7    --Omnibus Option Agreement by and among Boston Properties Limited
              Partnership (the "Operating Partnership") and the Grantors named
              therein dated as of April 9, 1997
    *10.8    --Revolving Credit Agreement with BankBoston, N.A.
    *10.9    --Form of Registration Rights Agreement among the Company and the
              persons named therein
   *10.10    --Form of Lease Agreement dated as of June  , 1997 between Edward
              H. Linde and Mortimer B. Zuckerman, as Trustees of Downtown
              Boston Properties Trust, and ZL Hotel LLC
   *10.11    --Form of Lease Agreement dated as of June  , 1997 between Edward
              H. Linde and Mortimer B. Zuckerman, as Trustees of Two Cambridge
              Center Trust, and ZL Hotel LLC
   *10.12    --Option Agreement between Boston Properties Limited Partnership
              and Square 36 Properties Limited Partnership dated April 15, 1997
   *10.13    --Form of Certificate of Incorporation of Boston Properties
              Management, Inc.
   *10.14    --Form of By-laws of Boston Properties Management, Inc.
   *10.15    --Form of Limited Liability Agreement of ZL Hotel LLC
   *10.16    --Form of Option Agreement to Acquire the Property known as Sumner
              Square
   *10.17    --Loan Modification Agreement between Lexreal Associates and
              Mitsui Seimei America Corporation relating to loan secured by 599
              Lexington Avenue
   *10.18    --Loan Modification and Extension Agreement by and between
              Southwest Market Limited Partnership, a District of Columbia
              limited partnership, Mortimer B. Zuckerman and Edward H. Linde
              and the Sumitomo Bank, Limited, for One Independence Square,
              dated as of September 26, 1994
   *10.19    --Loan Modification and Extension Agreement by and among Southwest
              Market Limited Partnership, a District of Columbia limited
              partnership, Mortimer B. Zuckerman and Edward H. Linde and the
              Sumitomo Bank, Limited, for Two Independence Square, dated as of
              September 26, 1994
   *10.20    --Construction Loan Agreement by and between the Sumitomo Bank,
              Limited and Southwest Market Limited Partnership, dated as of
              August 21, 1990
   *10.21    --Construction Loan Agreement by and between the Sumitomo Bank,
              Limited and Southwest Market Limited Partnership for Two
              Independence Square, dated as of February 22, 1991
   *10.22    --Consent and Loan Modification Agreement regarding One
              Independence Square between the Sumitomo Bank, Limited and
              Southwest Market Limited Partnership dated as of June  , 1997
   *10.23    --Consent and Loan Modification Agreement regarding Two
              Independence Square between the Sumitomo Bank, Limited and
              Southwest Market Limited Partnership dated as of June  , 1997
   *10.24    --Form of Amended and Restated Loan Agreement between Square 36
              Office Joint Venture and the Sanwa Bank Limited dated as of June
               , 1997
   *10.25    --Indemnification Agreement between Boston Properties Limited
              Partnership and Mortimer B. Zuckerman and Edward H. Linde
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT NO.                             DESCRIPTION
 -----------                             -----------
 <C>         <S>
    *10.26   --Compensation Agreement between the Company and Robert Selsam,
              dated as of August 10, 1995 relating to 90 Church Street
     10.27   --Contribution Agreement dated as of September 2, 1997 by and
              among the Operating Partnership, the Company and Kenvic
              Associates.
     10.28   --Lock-Up and Registration Rights Agreement dated November 21,
              1997 by and among the Operating Partnership, the Company and
              Kenvic Associates.
     10.29   --Agreement dated November 21, 1997 by and between the Operating
              Partnership and Kenvic Associates.
     10.30   --Note and Mortgage Modification and Spreader Agreement between
              John Hancock, as lender and Boston Properties Limited
              Partnership, as borrower.
  (2)10.31   --Agreement between Bankers Trust Company as seller and Boston
              Properties Limited Partnership, as purchaser, dated September 11,
              1997
  (1)10.32   --Term loan agreement between Chase Manhattan Bank, as lender and
              Boston Properties Limited Partnership, as borrower, dated
              September 11, 1997
  (1)10.33   --Interest Guarantee and Agreement between Chase Manhattan Bank,
              as lender and Boston Properties Limited Partnership, as borrower,
              dated September 11, 1997
  (1)10.34   --Net Cash Flow Shortfall Guarantee and Agreement between Chase
              Manhattan Bank, as lender and Boston Properties Limited
              Partnership, as borrower, dated September 11, 1997
  (1)10.35   --Hazardous Material Guaranty and Indemnification Agreement
              between Chase Manhattan Bank, as lender and Boston Properties
              Limited Partnership, as borrower, dated September 11, 1997
  (2)10.36   --Swap Transaction Agreement between the Chase Manhattan Bank and
              Boston Properties, Inc. dated November 4, 1997
  (3)10.37   --Amended and Restated Real Estate Purchase and Sale Contract
              Between International Business Machines Corporation, as seller,
              and Boston Properties Limited Partnership, as buyer, dated
              October 20, 1997
  (4)10.38   --First Amendment to Revolving Credit Agreement dated July 29,
              1997 by and among the Company, BankBoston, N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
  (4)10.39   --Second Amendment to Revolving Credit Agreement dated July 30,
              1997 by and among the Company, BankBoston, N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
  (4)10.40   --Third Amendment to Revolving Credit Agreement dated September
              11, 1997 by and among the Company, BankBoston N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
  (4)10.41   --Fourth Amendment to Revolving Credit Agreement dated October 31,
              1997 by and among the Company, BankBoston, N.A., and the
              subsidiaries of the Company and lending institutions named
              therein.
     10.42   --Environmental Indemnity and Agreement made by Boston Properties
              Limited Partnership in favor of John Hancock Mutual Life
              Insurance Company.
     10.43   --Indemnification Agreement made by Boston Properties Limited
              Partnership in favor of John Hancock Mutual Life Insurance
              Company.
     +21.1   --Schedule of Subsidiaries of the Company
      23.1   --Consent of Coopers & Lybrand, L.L.P.
      23.2   --Consent of Spaulding & Slye
      23.3   --Consent of Insignia/Edward S. Gordon Co., Inc.
      23.4   --Consent of Pinnacle Advisory Group
      23.5   --Consent of Colliers Pinkard
      23.6   --Consent of Harrison & Bates
      23.7   --Consent of Landauer Hospitality Group
     +23.8   --Consent of Goodwin, Procter & Hoar llp (included in Exhibits 5.1
              and 8.1)
</TABLE>
- --------
*Incorporated herein by reference to the Company's Registration Statement on
Form S-11 (No. 333-25279)
+To be filed by amendment.
(1) Incorporated herein by reference to the Company's Current Report on Form
    8-K/A filed November 14, 1997.
(2) Incorporated herein by reference to the Company's Current Report on Form
    8-K/A-2 filed November 25, 1997.
(3) Incorporated herein by reference to the Company's Current Report on Form
    8-K/A filed November 14, 1997.
(4) Incorporated herein by reference to the Company's Current Report on Form
    8-K filed November 26, 1997.

<PAGE>
 
                                                                   EXHIBIT 10.27
 
                            CONTRIBUTION AGREEMENT



                                 by and between



                               KENVIC ASSOCIATES
                                 as Contributor



                                      and



                     BOSTON PROPERTIES LIMITED PARTNERSHIP,
                                 as Partnership


                         Dated: as of September 2, 1997
<PAGE>
 
                             CONTRIBUTION AGREEMENT
                             ----------------------


     THIS CONTRIBUTION AGREEMENT (this "Agreement"), dated as of September 2,
                                        ---------                            
1997, is made by and between Kenvic Associates, a New York partnership, with an
address at 875 Third Avenue, New York, New York ("Contributor"), and Boston
                                                  -----------              
Properties Limited Partnership, a Delaware limited partnership, with an address
at 599 Lexington Avenue, New York, New York ("Partnership").
                                              -----------   

     For purposes of this Agreement, the following terms shall have the meanings
set forth below:

     "Adjoining Roads" shall have the meaning set forth in Section 1.1(g).
      ---------------                                                     

     "Aggregate Percentage" shall have the meaning set forth in Section 3.2(b).
      --------------------                                                     

     "Agreement" shall have the meaning set forth in the introductory paragraph
      ---------                                                                
and shall include all schedules and exhibits hereto.

     "Approval Period" shall be the period commencing with the date hereof, and
      ---------------                                                          
terminating on October 13, 1997.

     "Approved Title Matters" shall have the meaning set forth in Section
      ----------------------                                             
4.1(b).

     "Assignment" shall have the meaning set forth in Section 7.6(u).
      ----------                                                     

     "Award" shall have the meaning set forth in Section 1.1(h).
      -----                                                         

     "Bill of Sale" shall have the meaning set forth in Section 7.6(e).
      ------------                                                     

     "Business Days" shall mean every day other than Saturdays, Sundays, or
      -------------                                                        
other holidays on which banking institutions in New York are closed.

     "Closing" shall have the meaning set forth in Section 7.1.
      -------                                                  

                                       1
<PAGE>
 
     "Closing Date" shall have the meaning set forth in Section 7.1.
      ------------                                                  

     "Code" shall have the meaning set forth in Section 1.1.
      ----                                                  

     "Contracts" shall have the meaning set forth in Section 1.1(k).
      ---------                                                     

     "Contribution Amount" shall have the meaning set forth in Section 2.
      -------------------                                                

     "Contributor's Estoppel" shall have the meaning set forth in Section
      ----------------------                                             
3.2(b).

     "Contributor's PIO Notice" shall have the meaning set forth in Section
      ------------------------                                             
4.2(b).

     "Corner Parcel Land" shall have the meaning set forth in Section 1.1(b).
      ------------------                                                     

     "Corner Parcel Permitted Encumbrances" shall have the meaning set forth in
      ------------------------------------                                     
Section 1.1(b).

     "Deed" shall have the meaning set forth in Section 7.6(c).
      ----                                                     

     "Environmental Laws" shall mean all federal, state and local laws,
      ------------------                                               
statutes, ordinances and regulations, now in effect, and in each case as amended
or supplemented to date, including, without limitation, all applicable judicial
or administrative orders, applicable consent decrees and binding judgments
relating to the regulation and protection of human health, safety, the
environment and natural resources.  Environmental Laws include, without
limitation, the Comprehensive Environmental Response, Compensation, and
Liability Act of 1980, as amended (42 U.S.C. (S)(S) 9601, et seq.), the
                                                          -- ----      
Hazardous Material Transportation Act, as amended (49 U.S.C. (S)(S) 1801, et
                                                                          --
seq.), the Federal Insecticide, Fungicide, and Rodenticide Act, as amended (7
- ----                                                                         
U.S.C. (S)(S) 136, et seq.), the Resource Conservation and Recovery Act, as
                   -- ----                                                 
amended (42 U.S. (S)(S) 6901, et seq.) ("RCRA"), the Toxic Substance Control
                              -- ----    ----                               
Act, as amended (42 U.S.C. (S)(S) 7401, et seq.), the Clean Air Act, as amended
                                        -- ----                                
(42 U.S.C. (S)(S) 7401, et seq.), the Federal Water Pollution Control Act, as
                        -- ----                                              
amended (33 U.S.C. (S)(S) 1251, et seq.), the Occupational Safety and Health
                                -- ----                                     
Act, as amended (29 U.S.C (S)(S) 651, et seq.) and the Safe Drinking Water Act,
                                      -- ----                                  
as amended (42 U.S.C. (S)(S) 300f, et seq.), and their state and local
                                   -- ----                            
counterparts or equivalents 

                                       2
<PAGE>
 
and any transfer of ownership notification or approval statutes.

     "Governmental Authority" shall mean the United States government, any
      ----------------------                                              
state, regional, local or other political subdivision thereof with jurisdiction
and any Person (as defined hereinafter) with jurisdiction exercising executive,
legislative, judicial, regulatory or administrative functions of, or pertaining
to, government.

     "Ground Lease" shall have the meaning set forth in Section 1.1(b).
      ------------                                                     

     "Ground Lease Estoppel" shall have the meaning set forth in Section 3.3.
      ---------------------                                                  

     "Hancock" shall have the meaning set forth in Section 2.(b).
      -------                                                    

     "Hancock Mortgage" shall have the meaning set forth in Section 2.(b).
      ----------------                                                    

     "Hazardous Substances" shall mean (i) any toxic substance or hazardous
      --------------------                                                 
waste, substance or related material, or any pollutant or contaminant; (ii) any
explosive, radioactive material, a polychlorinated biphenyl, oil, petroleum
product, radon gas, asbestos in any form which is or could become friable, urea
formaldehyde foam insulation, transformers or other equipment that contain
dielectric fluid containing levels of polychlorinated biphenyls in excess of
federal, state or local regulations, action levels, safety guidelines, whichever
are more stringent; (iii) any substance, gas, material or chemical which is
defined as or included in the definition of "hazardous substances," "toxic
substances," "hazardous materials," "hazardous wastes" or words of similar
import under any Environmental Laws; and (iv) any other chemical, material, gas,
vapor, energy, radiation or substance, the exposure to or release of which is
prohibited, limited or regulated by any governmental or quasi-governmental
entity having jurisdiction over the Land or the operations or activity at the
Land.

     "Improvements" shall have the meaning set forth in Section 1.1(d).
      ------------                                                     

     "Inspections" shall have the meaning set forth in Section 4.2(a).
      -----------                                                     

                                       3
<PAGE>
 
     "Intangible Property" shall have the meaning set forth in Section 1.1(l).
      -------------------                                                     

     "Knowledge" shall have the meaning set forth in Section 5.1(d).
      ---------                                                     

     "Land" shall have the meaning set forth in Section 1.1(b).
      ----                                                     

     "Leases" shall have the meaning set forth in Section 1.1(i).
      ------                                                     

     "Legal Requirements" shall mean all federal, state, county, municipal and
      ------------------                                                      
other governmental statutes, laws, rules, orders, regulations, ordinances,
judgments, decrees and injunctions of any Governmental Authority (including,
without limitation, all Environmental Laws and the Americans With Disabilities
Act) affecting the Contributor or the Property or any part thereof or the
construction, use, alteration or operation thereof, or any part thereof, whether
now or hereafter enacted and in force, and all permits, licenses and
authorizations and regulations relating thereto.

     "Litigation" shall have the meaning set forth in Section 5.1(g).
      ----------                                                     

     "Lock-Up and Registration Rights Agreement" shall have the meaning set
      -----------------------------------------                            
forth in Section 5.1(x)(iv).

     "Major Tenant" and "Major Tenants" shall have the respective meanings set
      --------------------------------                                        
forth in Section 3.2(b).

     "Make Good Agreement" shall have the meaning set forth in Section 7.6(bb).
      -------------------                                                      

     "Office Parcel Land" shall have the meaning set forth in Section 1.1(a).
      ------------------                                                     

     "Office Parcel Permitted Encumbrances" shall have the meaning set forth in
      ------------------------------------                                     
Section 1.1(a).

     "Onsite Inspection" shall have the meaning set forth in Section 4.2(a).
      -----------------                                                     

     "Other Tenants" shall have the meaning set forth in Section 3.2(b).
      -------------                                                     

                                       4
<PAGE>
 
     "Owners Policy" shall have the meaning set forth in Section 4.1(a).
      -------------                                                     

     "Partnership" shall have the meaning set forth in the introductory
      -----------                                                      
paragraph.

     "Partnership Agreement" shall have the meaning set forth in Section 2(a).
      ---------------------                                                   

     "Partnership's Inspection Objections" shall have the meaning set forth in
      -----------------------------------                                     
Section 4.2(b).

     "Partnership's Title Objections" shall have the meaning set forth in
      ------------------------------                                     
Section 4.1(b).

     "Permitted Distributees" shall have the meaning set forth in the Lock-Up
      ----------------------                                                 
And Registration Rights Agreement.

     "Permitted Encumbrances" shall have the meaning set forth in Section
      ----------------------                                             
1.1(b).

     "Permitted Exceptions" shall have the meaning set forth in Section 4.1(d).
      --------------------                                                     

     "Person" shall mean any individual, sole proprietorship, partnership,
      ------                                                              
limited liability company, joint venture, trust, unincorporated organization,
association, corporation, institution, public benefit corporation, entity or
government (whether federal, state, county, city, municipal or otherwise,
including, without limitation, any instrumentality, division, agency, body or
department thereof).

     "Personality" shall have the meaning set forth in Section 1.1(e).
      -----------                                                     

     "PIO Closing Notice" shall have the meaning set forth in Section 4.2(b).
      ------------------                                                     

     "PIO Termination Notice" shall have the meaning set forth in Section
      ----------------------                                             
4.2(b).

     "Property" shall have the meaning set forth in Section 1.1.
      --------                                                  

     "REIT" shall have the meaning set forth in Section 5.1(x)(i).
      ----                                                        

                                       5
<PAGE>
 
     "REIT Shares" shall have the meaning set forth in Section 2(c).
      -----------                                                   

     "Rent Roll" shall have the meaning set forth in Section 3.1(a)(3).
      ---------                                                        

     "Rents" shall have the meaning set forth in Section 7.3(d).
      -----                                                     

     "Reports" shall have the meaning set forth in Section 4.2(d).
      -------                                                     

     "Securities Act" shall have the meaning set forth in Section 5.1.(x)(i).
      --------------                                                         

     "Security Deposits" shall have the meaning set forth in Section 1.1(i).
      -----------------                                                     

     "Survey" shall have the meaning set forth in Section 3.1(a)(1).
      ------                                                        

     "Tangible Personal Property" shall have the meaning set forth in Section
      --------------------------                                             
1.1(j).

     "Tax Year" shall have the meaning set forth in Section 7.3(a).
      --------                                                     

     Tenant Estoppel shall have the meaning set forth in Section 3.2(a).
     ---------------                                                    

     "Threshold Amount" shall have the meaning set forth in Section 11.1.
      ----------------                                                   

     "Title Approval Period" shall have the meaning set forth in Section 4.1(b).
      ---------------------                                                     

     "Title Commitment" shall have the meaning set forth in Section 4.1(a).
      ----------------                                                     

     "Title Company" shall have the meaning set forth in Section 4.1(a).
      -------------                                                     

     "Title Report" shall have the meaning set forth in Section 4.1(a).
      ------------                                                     

     "Units" shall have the meaning set forth in Section 2.(a).
      -----                                                    

                                       6
<PAGE>
 
     IN CONSIDERATION OF THE MUTUAL COVENANTS AND REPRESENTATIONS HEREIN
CONTAINED, AND OTHER GOOD AND VALUABLE CONSIDERATION, THE RECEIPT AND
SUFFICIENCY OF WHICH ARE HEREBY ACKNOWLEDGED,  CONTRIBUTOR AND PARTNERSHIP AGREE
AS FOLLOWS:

                                  SECTION 1.
                         CONTRIBUTION AND ACQUISITION
                         ----------------------------

      1.1 Contribution and Acquisition.  Subject to the terms and conditions of
          ----------------------------                                         
this Agreement, Contributor hereby agrees to contribute, assign, transfer,
deliver and convey to Partnership, and Partnership hereby agrees to acquire from
Contributor, all of Contributor's right, title and interest in and to the
following described property, (such right, title and interest is collectively
called the "Property") in return for an ownership interest in Partnership and
            --------                                                         
admission as a limited partner in Partnership, in a manner to be treated as a
contribution of property to a partnership in exchange for an interest therein to
be governed for tax purposes by Section 721 of the Internal Revenue Code of
1986, as amended (the "Code"), subject to and in accordance with the terms,
                       ----                                                
provisions, covenants and conditions more particularly set forth in this
Agreement:

          (a) all those certain plots, pieces or parcels of land described in
Exhibit A annexed hereto and made a part hereof (the "Office Parcel Land"), and
- ---------                                             ------------------       
fee simple title to the Office Parcel Land, subject only to the exceptions
provided for in this Agreement and the matters set forth in Schedule 1.1(a) (the
                                                            ---------------     
"Office Parcel Permitted Encumbrances");
 ------------------------------------   

          (b) Contributor's interest as lessee under that certain ground lease,
the documents comprising which are listed in Exhibit A-1 annexed hereto and made
                                             -----------                        
a part hereof (the "Ground Lease") which Ground Lease demises that certain
                    ------------                                          
parcel of land (the "Corner Parcel Land") located in the City of New York, State
                     ------------------                                         
of New York and more particularly described in Exhibit A-1(a), subject only to
                                               --------------                 
the exceptions provided for in this Agreement and the matters set forth on
Schedule 1.1(b) (the "Corner Parcel Permitted Encumbrances"); (the Office Parcel
- ---------------       ------------------------------------                      
Permitted Encumbrances, and Corner Parcel Permitted Encumbrances, are
hereinafter collectively called the "Permitted Encumbrances".  The Office Parcel
                                     ----------------------                     
Land and Corner Parcel Land are hereinafter collectively referred to as the
                                                                           
"Land");
- -----   

                                       7
<PAGE>
 
          (c) all easements, rights of way, privileges, appurtenances, gaps,
gores, and other rights pertaining to the Land and Ground Lease including, but
not limited to, any development rights and air rights appurtenant to the Land
and Ground Lease;

          (d) all buildings and improvements and fixtures now or hereafter
erected on the Land, which building is located at and having an address at 875
Third Avenue, New York, N.Y. (collectively, the "Improvements");
                                                 ------------   

          (e) all fixtures, machinery, equipment and other articles of personal
property now or hereafter attached or appurtenant to the Land or Improvements,
or used or useful in connection with the maintenance, operation or ownership of
the Land or the Improvement which are owned by Contributor, if any
(collectively, the "Personalty");
                    ----------   

          (f) all leases in which Contributor is the lessee, if any, of
equipment used in the operation or maintenance of the Land or Improvements as
listed on Schedule 1.1(f) attached hereto;
          ---------------                 

          (g) any land lying in the bed of any street, road or avenue opened or
proposed, public or private, in front of or adjoining the Land, to the center
line thereof ("Adjoining Roads"); and
               ---------------       

          (h) any award made or to be made and in and to any unpaid award for
damage to the Property by reason of change of grade of any street or otherwise
(collectively, an "Award").
                   -----   

          (i) all leases or licenses of space in the Improvements (the
"Leases"), and all tenant security deposits ("Security Deposits") held by
 ------                                       -----------------          
Contributor on the Closing Date (defined in Section 7.1) and a current rent roll
                                            -----------                         
of the tenants all of which are set forth and described on Schedule 1.1(i).
                                                           --------------- 

          (j) All appliances, fixtures, equipment, machinery, furniture, carpet,
drapes and other personal property if any, owned by Contributor, located on and
used in connection with the Land or the Improvements (the "Tangible Personal
                                                           -----------------
Property").  The major equipment or machinery used in the operation of the
- --------                                                                  
Improvements are set forth and described in Schedule 1.1(j).
                                            --------------- 

                                       8
<PAGE>
 
          (k) To the extent assignable without the consent of third parties, all
written contracts and agreements pertaining to the Property (collectively, the
"Contracts"), including, but not limited to, service contracts and maintenance
- ----------                                                                    
contracts all of which are set forth and described on Schedule 1.1(k).
                                                      --------------- 

          (l) To the extent assignable without the consent of third parties, all
intangible property (the "Intangible Property"), if any, owned by Contributor
                          -------------------                                
and pertaining to the Land, the Improvements, or the Tangible Personal Property
including, without limitation, transferable telephone exchange numbers, plans
and specifications, licenses, permits, engineering plans and studies, floor
plans and landscape plans, trade names and trade marks.


                                  SECTION 2.
                              CONTRIBUTION AMOUNT
                              -------------------

          The property and value to be given by Partnership to Contributor (the
"Contribution Amount") for the Property shall, subject to adjustments as set
 -------------------                                                        
forth herein in this Agreement, be as follows:

          (a) Twenty-five Million ($25,000,000) Dollars at Closing by the
admission of Contributor as an Additional Limited Partner as defined in that
certain Amended and Restated Agreement of Limited Partnership of Boston
Properties Limited Partnership dated as of June 23, 1997, as amended (the
"Partnership Agreement"), and the issuance by Partnership to Contributor of
- ----------------------                                                     
Units (as such term is defined in the Partnership Agreement) ("Units").
                                                               -----    
Contributor and Partnership agree that for the purpose of computing the value of
Units for this Agreement, each Unit shall be valued at $28.0625 and,
accordingly, Partnership shall transfer to Contributor and Contributor shall
accept from Partnership at Closing 890,869 Units as full and complete payment of
the $25 million due to Contributor at Closing, notwithstanding any other value
ascribed or attributed to Units by anyone for any purpose, and Contributor shall
and does assume any risk with respect to the value of the Units to be received
by Contributor pursuant to this Agreement; and

          (b) The balance of the Contribution Amount by Partnership accepting
title to the Property at Closing subject to an existing mortgage held by John
Hancock Mutual Life Insurance Company ("Hancock") dated as of December 29, 
                                        -------   

                                       9
<PAGE>
 
1995, recorded on January 5, 1996 in Reel 2279, page 443, in the principal face
amount of $180,000,000 (which document, together with the documents listed on
Schedule 5.1(s), the "Hancock Mortgage").
                      ----------------   

          (c) If on December 31, 1998 the closing price of the common stock of
the REIT (as defined in the Partnership Agreement (the "REIT Shares")) is less
                                                        -----------           
than $31.43 per share, promptly following such date, Partnership shall transfer
to Contributor the number of additional Units provided for in accordance with
the Make Good Agreement.

                                  SECTION 3.
                           CONTRIBUTOR'S DELIVERIES
                           ------------------------

      3.1 Delivery Obligations.
          -------------------- 

          (a) To the extent not heretofore delivered to Partnership, Contributor
shall deliver to Partnership, at Contributor's expense, on the date hereof, the
following:

               (1) Survey.  The most recent and existing "as built" survey of
                   ------                                                    
     the Property (the "Survey"), if any, in Contributor's possession.
                        ------                                        

               (2) Leases and Contracts.  Copies of all Leases and Contracts.
                   --------------------                                      

               (3) Rent Roll.  A rent roll (the "Rent Roll") identifying all
                   ---------                     ---------                  
     Leases current as of a date not earlier than thirty (30) days prior to the
     date hereof.

               (4) Organizational Documents.  A copy of the Partnership 
                   ------------------------
Agreement and organizational documents of Vic Associates, a New York limited
partnership, and Gladwater Associates, a New York general partnership, a
statement certified by Contributor as to the consents required by Contributor
and from its constituent partners to enter into and carry out the transactions
contemplated by this Agreement, and an incumbency certificate of Contributor
("Contributors Organizational Documents").
  -------------------------------------   

      3.2 Tenant Estoppel Certificates.
          ---------------------------- 

          (a) Contributor agrees to submit or cause its property manager to
submit, within ten (10) days after the date hereof, to each tenant or lessee
under a Lease, (i) an estoppel certificate ("Tenant's Estoppel"), in the form
                                             -----------------               

                                       10
<PAGE>
 
required by such tenant's Lease, provided, however, the form of Tenant's
Estoppel submitted to the Major Tenants shall be in form substantially in
accordance with Exhibit B attached hereto and (ii) a request that the Tenant's
                ---------                                                     
Estoppel from the "Other Tenants" (hereafter defined) and from each Major Tenant
be executed and returned not later than two weeks after such date of delivery.
Each executed Tenant Estoppel which either (x) contains non-material exceptions,
qualifications or modifications, or (y) complies with such tenant's Lease, shall
be deemed to comply with Contributor's obligations under this Section 3.2(a).

          (b) In the event that Contributor is unable to obtain and deliver to
Partnership on or before that day which is ten (10) business days preceding the
end of the Approval Period executed Tenant Estoppels that comply with
subparagraph (a) and do not contain material qualifications to the Rent Roll or
to the stated provisions of the relevant Lease, from  tenants leasing, in the
aggregate, at least seventy-five (75%) percent (the "Aggregate Percentage") of
                                                     --------------------     
the net rentable space in the Improvements demised under Leases, but in any
event including Tenant Estoppels from Grey Advertising, Debevoise & Plimpton,
Sidley and Austin, Instinet Corporation, AuBon Pain, and Cosmetics Plus (each, a
"Major Tenant", and collectively, the "Major Tenants", all tenants not Major
 ------------                          -------------                        
Tenants, are referred to as "Other Tenants"), Partnership shall have the option
                             -------------                                     
of: 1) terminating this Agreement by delivering notice thereof in writing to
Contributor, no later than that day which is two (2) business days preceding the
Closing Date in which event this Agreement shall terminate and neither party
shall have any obligations hereunder to the other except with respect to those
obligations that survive termination of this Agreement; or 2) requesting that
Contributor shall, on or before the Closing Date, deliver to Partnership an
estoppel, substantially in compliance with Exhibit B, executed by Contributor to
                                           ---------                            
Contributor's Knowledge, with respect to any Major Tenant or Other Tenant from
whom Contributor has been unable to obtain a Tenant Estoppel (each a
"Contributor's Estoppel") and Contributor (i) shall, at or prior to the Closing
Date, deliver to Partnership such Contributor's Estoppel with respect to each
Other Tenant who has not delivered its own Tenant Estoppel, and (ii) may, but is
not required to, at or prior to Closing, deliver to Partnership a Contributor's
Estoppel with respect to each Major Tenant which has not delivered its own
Tenant Estoppel.  If Contributor, having requested a Tenant Estoppel from each
tenant under a Lease, fails for any reason to deliver either (x) a Tenant
Estoppel for each of the Major Tenants, or (y) a Contributor's Estoppel for each
Major Tenant 

                                       11
<PAGE>
 
who has not delivered its Tenant Estoppel (or, 

                                       12
<PAGE>
 
if requested by the Partnership, fails for any reason to deliver a Contributor's
Estoppel for an Other Tenant), Partnership may, at any time up to and including
the Closing Date as its sole and exclusive remedy either: (i) give notice to
Contributor of Partnership's election to terminate this Agreement, and upon
giving such termination notice, this Agreement shall terminate and neither party
shall have any obligations hereunder to the other except with respect to those
obligations that survive a termination of this Agreement; or (ii) elect to
proceed with the Closing and accept the tendered executed Tenant Estoppels and
Contributor's Estoppels for all tenants who have not provided a Tenant's
Estoppel which Contributor delivered as full satisfaction of Contributor's
obligations hereunder with respect to Tenant Estoppels and Contributor's
Estoppels. Nothing contained herein shall permit Contributor to substitute a
Contributor's Estoppel for a Tenant Estoppel of a Major Tenant, except if
expressly requested by Partnership to do so, it being expressly agreed that it
is a condition to Closing that a Tenant Estoppel for each Major Tenant and a
Tenant Estoppel or Contributor's Estoppel for each Other Tenant is delivered to
the Partnership unless waived by Partnership.

          (c)  Notwithstanding anything contained in this Section 3.2 to the
contrary, (i) any estoppel certificate from a Major Tenant that substantially
conforms to such tenant's obligation under its Lease, shall be deemed to be in
compliance with Contributor's obligation to deliver such Major Tenant's Tenant
Estoppel, (ii) attached hereto as Exhibit B-3 and B-4 respectively, are (x) a
form of Tenant Estoppel for Other Tenants, and (y) an addendum from a prior
estoppel from Debevoise and Plimpton and (ii) Partnership shall accept as full
compliance by Contributor with its obligations under Section 3.2(a), estoppels
from the Other Tenants substantially in the form of Exhibit B-3 and a Debevoise
and Plimpton estoppel containing, as an addendum, a rider similar to Exhibit B-
4.  Contributor hereby grants permission to Partnership to talk to Debevoise and
Plimpton about any exceptions made by Debevoise and Plimpton to its Tenant
Estoppel or, if such Tenant Estoppel is not received by Contributor by September
30, 1997, the items set forth on Exhibit B-4.  Any claim this Contributor's
representations contained in any Contributor's Estoppel are not materially true
shall be subject to the limitation set forth in Section 8.1(b) and shall be made
in writing but in no event shall such claim be made later than ninety (90) days
after the Closing.

      3.3 Ground Lease Estoppel Certificates.
          ---------------------------------- 

                                       13
<PAGE>
 
          Contributor agrees to submit or cause its property manager to submit,
within ten (10) days after the date hereof, to the landlord of the Corner Parcel
under the Ground Lease, an estoppel certificate, in form substantially in
accordance with Exhibit B-1 attached hereto ("Ground Lease Estoppel") and a
                -----------                   ---------------------        
request that such Ground Lease Estoppel be executed and returned not later than
two weeks after such date of delivery, provided, however that the form of
estoppel certificate required by the Ground Lease shall be deemed to be in
compliance with Contributor's obligations hereunder.


                                  SECTION 4.
                            TITLE AND INSPECTIONS.
                            --------------------- 

      4.1 Title.
          ----- 

          (a) Promptly after the date hereof, Partnership shall request from a
title company acceptable to Partnership, a title insurance commitment (the
"Title Commitment") for the Property, for an owners title insurance policy (the
- -----------------                                                              
"Owners Policy") (such report and all amendments, endorsements, and
 -------------                                                     
continuations thereof being, collectively the "Title Report"), issued in the
                                               ------------                 
name of Partnership by the title company (the "Title Company").  Copies of the
                                               -------------                  
Title Report and each update and continuation and Title Commitment shall be sent
to Contributor promptly after receipt thereof by Partnership, but in any event,
no later than ten (10) business days after receipt.  In addition, at
Partnership's sole and absolute discretion and expense, Partnership may request
an update of the Survey, or a new Survey.

          (b) In the event (i) an update of the Survey shows any easement,
right-of-way, encroachment, lien, encumbrance or other matter affecting the Land
or Improvements that did not appear on the Survey and is unacceptable to
Partnership, or (ii) any exceptions appear in the Title Report or Title
Commitment (other than the standard printed exceptions set forth in the standard
form of Title Commitment) that are unacceptable to Partnership; and such matters
or exceptions shown on the updated Survey or Title Commitment are not Permitted
Encumbrances, Partnership shall before ten (10) business days after receipt of
the last of each of the updated Survey, the Title Commitment and copies of all
documents referred to as exceptions in the Title Commitment and any amendment,
endorsement or continuation search (such period, until ten (10) business days
after receipt of the last such items, the "Title Approval Period"), notify
                                           ---------------------          

                                       14
<PAGE>
 
yContributor in writing of such facts, and the curative steps that would remove
the basis for Partnership's objection ("Partnership's Title Objections").  Upon
                                        ------------------------------         
the expiration of the Title Approval Period, except for Partnership's Title
Objections, Partnership shall be deemed to have accepted the form and substance
of the Survey, all matters shown or addressed thereon, all existing conditions
of title to the Land and Improvements including, without limitation, any
easement, right of way, encroachment, conflict, discrepancy, overlapping of
improvements, lien, encumbrance, restriction, condition, covenant, exception or
other matter with respect thereto and all items shown or addressed in the Title
Report, including the standard printed exceptions (collectively, the "Approved
                                                                      --------
Title Matters").
- -------------   

          (c) Upon receipt by Contributor of Partnership's Title Objections,
Contributor shall forthwith undertake, with due diligence, to endeavor to
eliminate Partnership's Title Objections provided, however, with the exception
                                         --------  -------                    
of those items set forth in the next succeeding sentence, Contributor shall not
be obligated to expend an amount greater than $100,000 in the aggregate to
eliminate all Partnership's Title Objections.  Notwithstanding the foregoing
sentence, Contributor shall be obligated to remove each Partnership's Title
Objection if: (i) such Partnership's Title Objection can be removed by the
payment of a liquidated sum of money only, such as a mortgage duly placed
against the Property with respect to which Contributor is the mortgagor, or a
fine, penalty, mechanics lien, or judgement duly filed against the Property
which are either fines, penalties, or judgments against Contributor or in the
case of a mechanic's lien, relates to an obligation of Contributor; or (ii) such
Partnership's Title Objection arises as a result of any willful or voluntary act
of Contributor or any affiliate of Contributor, such as the granting of an
easement or other willful breach of the express terms and conditions of this
Agreement, regardless of the cost, but not in any instance referred to in this
Section 4.1(c) including any act of any tenant of the Improvements.  Contributor
shall be entitled to adjourn the Closing for a period not to exceed thirty (30)
days in order to eliminate a Partnership Title Objection.  If Contributor is
unable, or is not required to, eliminate a Partnership's Title Objection,
Contributor shall promptly, but not later than five (5) business days after
receipt of notice of Partnership's Title Objection, so notify Partnership, and
Partnership as its sole and exclusive remedy, may thereafter: (x) terminate this
Agreement by notice given to Contributor, in which event, neither party 

                                       15
<PAGE>
 
shall have any rights or obligations to the other under this Agreement, except
with respect to those obligations that survive a termination of this Agreement,
or (y) elect to accept title subject to such Partnership's Title Objections
without any abatement or other adjustments to the Units delivered at the Closing
or thereafter or to any other amount due Contributor pursuant to this Agreement.

          (d) The term "Permitted Exceptions" as used herein includes:  (i) the
                        --------------------                                   
Approved Title Matters, (ii) the Permitted Encumbrances, (iii) the rights and
interests of parties claiming under Leases, (iv) liens for real property taxes,
assessments, and water and sewer meter charges which are not due and payable as
of the Closing Date and which are apportioned pursuant to this Agreement, and
(v) liens arising from acts of Partnership, or its agents, representatives or
contractors.

          (e) If the Title Report discloses judgments, bankruptcies, mortgages,
liens  or other returns against other persons having names the same as or
similar to that of the Contributor, Contributor shall deliver to Partnership and
Title Company at Closing an affidavit showing that such judgments, mortgages,
bankruptcies, liens or other returns are not against Contributor.  Contributor
also shall deliver appropriate affidavits and documentary evidence reasonably
required by the Title Company to eliminate standard exceptions appearing in the
Title Report that Partnership is not required to accept.  In no event shall
Contributor be obligated to deliver an affidavit of title.

          (f) At the Closing, Contributor shall deliver to the Title Company an
affidavit with respect to mechanics' liens certifying that there are no unpaid
bills for services rendered or materials furnished to the Property on behalf of
Contributor, or if there are any unpaid bills, an agreement reasonably
acceptable to the Title Company indemnifying it against any damages, costs,
expenses or liability incurred by reason of any claims made or liens filed by
reason of any such services or materials and which will permit the Title Company
to omit or insure affirmatively against any mechanics' liens as a result
thereof.

      4.2 Inspection.
          ---------- 

          (a) During the Approval Period, Partnership may inspect, test,
examine, investigate and survey (collectively, "Inspections"):  (i) the
                                                -----------            
Property, (ii) all of Contributor's 

                                       16
<PAGE>
 
financial records maintained at the Property by Contributor or by Contributor's
manager which pertain to the operation of the Property, (iii) all Leases,
Equipment Leases and Contracts, and (iv) the Rent Roll. Contributor shall
cooperate with Partnership regarding the Inspection. An Inspection done at the
Property or Contributor's offices, (each, an "Onsite Inspection") may be done at
                                              -----------------
any reasonable time during ordinary business hours upon twenty-four (24) hours
prior notice to Contributor, at Partnership's sole cost provided it is conducted
in a manner not materially disruptive to tenants or the operation of the
Property. If Contributor determines in its reasonable judgment that an Onsite
Inspection is not being so conducted, Contributor shall notify Partnership and
Partnership shall immediately cease such objected to conduct. Notwithstanding
the foregoing, Partnership must obtain Contributor's prior written approval of
(x) the scope and method of any Onsite Inspection, (other than a Phase I
environmental inspection) which would involve taking subsurface borings or
related investigations; (y) any inspection which would alter the physical
condition of the Property from it condition prior to Partnership's commencement
of such inspections, testing or investigation; and (z) any inspection which
might entail interaction with tenants of the Property. Contributor's
representatives, agents, and contractors shall have the right to be present
during any Onsite Inspection.

          (b) If any Inspection reveals any fact or condition unacceptable to
Partnership, at Partnership's option, Partnership may notify Contributor in
writing prior to the expiration of the Approval Period of such unacceptable fact
or condition, the reasons therefor and the curative steps necessary to remove
the basis for Partnership's objection ("Partnership's Inspection Objections").
                                        -----------------------------------    
Except as provided herein, Contributor shall have no obligation to take any
steps or bring any action or proceeding or otherwise to incur any effort or
expense whatsoever to eliminate or cure any of the Partnership's Inspection
Objections; provided, however, Contributor, at its sole option, may attempt to
            --------  -------                                                 
eliminate or cure some or all or a portion of Partnership's Inspection
Objections to Partnership's satisfaction prior to the Closing Date.  In the
event Contributor is unable or unwilling to attempt to eliminate or cure all of
Partnership's Inspection Objections to the satisfaction of Partnership,
Contributor shall provide written notice to Partnership of those objections
Contributor will not attempt to cure ("Contributor's PIO Notice").  Partnership
                                       ------------------------                
may, as its sole and exclusive remedy: (A) terminate this Agreement 


                                      17

<PAGE>
 
by delivering notice thereof in writing to Contributor by the earlier to occur
of (i) the Closing Date, or (ii) ten (10) business days after Contributor's PIO
Notice, (such notice, the "PIO Termination Notice"); or (B) elect to close (the
                           ----------------------
"PIO Closing Notice") without any abatement or other adjustment in the
 ------------------
Contribution Amount or to the Units delivered at the Closing or thereafter or to
any other amount due Contributor pursuant to this Agreement. If Partnership
shall duly give the PIO Termination Notice, then this Agreement shall terminate,
and neither party shall have any obligation hereunder other than with respect to
those obligations which survive a termination of this Agreement. If Partnership
does not notify Contributor of Partnership's Inspection Objections in writing
prior to the expiration of the Approval Period, all Inspections, and all
conditions relating to the Property, shall be deemed satisfactory to Partnership
as at the termination of the Approval Period, and Partnership shall have no
further right to terminate this Agreement pursuant to this Section.

          (c) Partnership agrees that, in making any intrusive or non-intrusive
physical or environmental inspections of the Property, Partnership and all of
Partnership's agents entering onto the Property shall carry not less than Five
Million Dollars ($5,000,000) comprehensive general liability insurance insuring
all activity and conduct of Partnership and such representatives while
conducting such inspection which insurance shall be on an "occurrence" basis, or
will otherwise keep its insurance in full force and effect so as to continue
coverage until two (2) years after the earlier of Closing or termination of this
Agreement. Contributor, Gladwater Associates, Vic Associates, General Chemical
and Supply Co., Inc., Lucille Gladstone and Kenneth Gladstone shall be named as
additional insureds on such comprehensive general liability policy.  Partnership
represents and warrants that it carries not less than Five Million Dollars
($5,000,000) comprehensive general liability insurance with contractual
liability endorsement which insures Partnership's indemnity obligations under
this Agreement, and at least three (3) business days prior to commencement of
any activity permitted by this Section 4.2(c), will provide Contributor with
written evidence of such insurance.

          (d) All information provided by Contributor to Partnership or obtained
by Partnership relating to the Contributor, Leases, tenants, Legal Requirements,
Contracts, and the Property in the course of Partnership's Inspections,

                                       18
<PAGE>
 
including, without limitation, any environmental assessment or audit
(collectively, the "Reports") shall be treated as confidential information by
                    -------                                                  
Partnership and its employees, agents, representatives, and contractors, and
accountants and Partnership shall obtain the written agreement, for the benefit
of Contributor, of all such employees, agents, representatives, contractors, and
accountants to maintain the confidentiality of all such information and shall be
responsible for any breach thereof.  In the event that this transaction is not
closed for any reason, then Partnership and its employees, agents,
representatives, contractors, and accountants shall deliver to the Contributor
within ten (10) business days after this Agreement terminates (i) copies of all
Reports and of any memoranda containing any analysis thereof and (ii) executed
copies of all such written confidentiality agreements.  REIT has also executed a
letter to Lucille Gladstone and Contributor dated April 22, 1997 which further
obligates REIT to maintain the confidentiality of the confidential information
and REIT hereby reaffirms its agreement on its own behalf and on behalf of the
Partnership in such letter.  In the event Partnership or REIT becomes legally
compelled to disclose all or any part of the confidential information,
Partnership or REIT, as the case may be, shall provide Contributor with prompt
written notice so that Contributor may seek a protective order or other
appropriate remedy and Partnership and REIT shall cooperate with Contributor
with respect thereto.

          (e) Partnership shall be liable for all damage or injury to any person
or property resulting from, relating to or arising out of any of the
Inspections, whether occasioned by the acts of Partnership or any of its
employees, agents, representatives or contractors, and Partnership shall
promptly satisfy any lien which may arise or be filed against Contributor or the
Property in connection with any of the Inspections.  Partnership shall
indemnify, defend and hold harmless Contributor and its agents, employees,
officers, directors, affiliates, advisors and asset managers from any loss,
liability, damage, cost or expense (including, without limitation, reasonable
attorneys fees and disbursements) resulting from any Inspection or lien filed
against Contributor or the Property in connection therewith.

          (f) The provisions of Sections 4.2(c), (d) and (e) shall survive the
Closing or the earlier termination of this Agreement.

                                  SECTION 5.

                                       19
<PAGE>
 
            REPRESENTATIONS, WARRANTIES AND COVENANTS OF CONTRIBUTOR
            --------------------------------------------------------

      5.1 Contributor's Representations.  As a material inducement to
          -----------------------------                              
Partnership to enter into this Agreement and to consummate the transactions
contemplated hereby, Contributor hereby makes to Partnership each of the
representations and warranties set forth in this Section 5, which
representations and warranties are true in all material respects as of the date
hereof and shall be true in all material respects on the Closing Date, and shall
survive the Closing only if and to the extent expressly provided in the
particular representation set forth in this Section 5.1.

          (a) Contributor is a partnership duly formed and in good standing
under the laws of the State of New York and has all requisite partnership power
and authority to carry on its business as it is currently being conducted and to
execute, deliver and perform this Agreement and all documents to be executed and
delivered by it in regard to the consummation of the transactions contemplated
hereby and to perform fully its obligations hereunder and thereunder.  The
execution, delivery and performance by Contributor of this Agreement and all
documents to be executed and delivered by it in regard to the consummation of
the transaction contemplated hereby have been duly authorized by all necessary
partnership action on the part of Contributor, and Contributor shall, upon
request of Partnership or the Title Company, deliver evidence of such authority
at or prior to the Closing.

          (b) Provided Hancock consents to the transaction contemplated by this
Agreement, this Agreement has been, and all documents to be executed and
delivered by Contributor in regard to the consummation of the transactions
contemplated hereby will be at or prior to Closing, duly executed and delivered
by Contributor, and (assuming the due authorization, execution, delivery and
performance by the other parties hereto and thereto) this Agreement constitutes,
and all documents to be executed and delivered in regard to the consummation of
the transaction contemplated hereby when so executed and delivered will
constitute the legal, valid and binding obligations of Contributor, enforceable
against Contributor in accordance with their respective terms, subject to
applicable bankruptcy, insolvency, reorganization, moratorium and similar laws
affecting creditors' rights and remedies generally and subject, as to
enforceability, to general principles of equity (regardless of whether
enforcement is sought in a proceeding at law or in equity).

                                       20
<PAGE>
 
          (c) Contributor owns legal and beneficial title to the Property, free
and clear of all adverse claims, liens and encumbrances, except for the
Permitted Exceptions and as set forth in the Title Commitment.

          (d) Schedule 1.1(i) is a true, complete and correct list of all of the
              ---------------                                                   
Leases and all amendments and modifications thereto.  Contributor has delivered
true and correct copies of the Leases, as amended and supplemented, to
Partnership.  The Leases are in full force and effect, and have not been
amended, modified, supplemented or terminated, except as set forth on said
Schedule 1.1(i).  To Contributor's Knowledge, there does not exist any material
- ---------------                                                                
default or event or condition which, with the passage of time or the giving of
notice or both, would constitute a material default by Contributor under the
terms of any of the Leases. The term "Knowledge", as used in this Agreement with
respect to Contributor shall mean the actual awareness by either John Lesher,
Lucille Gladstone or Ralph Scelfo without relying on attribution by, through or
under any other Person, but Contributor shall be deemed to have actual knowledge
of all matters contained in documents set forth or referred to herein or in
schedules to this Agreement.

          (e) Except for the tenants under the Leases and anyone claiming by,
through or under such tenants, and the Metropolitan Transportation Authority
pursuant to the documents listed on Schedule 1.1(a) or (b), no person, firm,
corporation or other entity has any option or other right to use all or any part
of the Property.

          (f) Except as may be set forth on Schedule 5.1(f) hereto, Contributor
                                            ---------------                    
has satisfied in full all tenant improvement obligations, work letters,
construction obligations, rent allowances, and leasing commissions, if any,
required to be satisfied prior to the date hereof, relating to the Property.
Landlord's obligations under the Leases regarding tenant improvements
obligations, work letters, construction obligation, rent allowances or leasing
commissions, if any, required to be satisfied after Closing are set forth on
Schedule 5.1(f).  The representations and warranties set forth in Section 5.1(f)
- ---------------                                                                 
shall, but only with respect to any matter relating to a tenant under a Lease
whose Tenant Estoppel is inconsistent with Section 5.1(f), or Schedule 5.1(f),
and then only to the extent so inconsistent, survive the Closing for a period of
ninety (90) days.

                                       21
<PAGE>
 
          (g) Except as set forth in Schedule 5.1(g), Contributor has no
                                     ---------------                    
Knowledge of any action or proceeding (zoning or otherwise) in any court or
before any Governmental Authority ("Litigation") pending or to Contributor's
                                    ----------                              
Knowledge, threatened (i) against or relating to the Property, the Leases, or
the transactions contemplated by this Agreement, or (ii) against Contributor
with respect to the transactions contemplated by this Agreement, or (iii) which
seeks to enjoin or obtain damages in respect of the consummation of the
transactions contemplated hereby.  This representation and warranty shall
survive the Closing for a period of ninety (90) days.

          (h) Except as set forth on Schedule 5.1(h), Contributor does not
                                     ---------------                      
currently retain anyone to file notices of protest against, or to commence
actions to review, real property tax assessments against the Property, and is
not aware that any such action has been taken by or on behalf of any tenant
under any Lease.  This representation and warranty shall survive the Closing for
a period of ninety (90) days.

          (i) Except as set forth in Schedule 5.1(i), Contributor has no
Knowledge that:  (i) the Property, and the use thereof, does not materially
comply with all Legal Requirements including applicable building, fire and other
laws, ordinances and regulations applicable thereto, (ii) the Property is in
violation of any applicable zoning ordinances, and (iii) any notices, reports or
other filings are required to be made by Contributor with any Governmental
Authority with respect to the Property which have not been made. Except as set
forth on Schedule 5.1(i), Contributor has no Knowledge that any notice has been
         ---------------                                                       
received by Contributor from any insurance company, board of fire underwriters
(or other body exercising similar functions), municipal, environmental or
governmental or public agency, claiming any violation of law or municipal
ordinances or of federal, state, county or municipal or other Governmental
Authority regulations, orders or requirements or defects or deficiencies or
requesting the performance of any repairs, alterations or other work at the
Property which has not been corrected or repaired.  This representation and
warranty set forth in the second sentence of this Section 5.1(i) shall survive
the Closing for a period of ninety (90) days.

          (j) The use of the Property in all material respects complies with all
applicable deed restrictions or other covenants, restrictions or agreements,
site plan approvals or subdivision regulations or urban redevelopment 

                                       22
<PAGE>
 
plans applicable to the Property, as modified by any duly issued variances

          (k) Except as set forth in Schedule 5.1(k), no consents, licenses,
                                     ---------------                        
permits, authorizations or requisite approvals are required to be obtained by
Contributor from any Governmental Authority or any other Person in connection
with the execution and delivery of this Agreement by Contributor.

          (l) (i)  All public utility connections located at the Property have
been paid for and all water and other public utilities required for the
operation of the Property enter through adjoining public streets or through
valid recorded easements across adjoining private lands.  All loading bays
located within the perimeter of the Property are private and have not been
dedicated to any public authority; and (ii) Contributor has no Knowledge that it
has been notified of any law, rule, regulation, ordinance, moratorium or policy
decision of or imposed by any Governmental Authority having jurisdiction
prohibiting or restricting the use, installation or connection of any storm
sewers, public water facilities or gas and electrical facilities necessary to
the ownership and operation of the Property.  The provisions of clause (ii) of
this representation and warranty shall survive the Closing for a period of
ninety (90) days.

          (m) Contributor has no Knowledge of any federal, state, county or
municipal plans to restrict or change access from any highway, road or waterway
to the Property or of any pending or threatened condemnation of the Property or
any part thereof or of any plans for improvements.  This representation and
warranty shall survive the Closing for a period of ninety (90) days.

          (n) The Property has access to public roads either directly or by
easement or special permit.

          (o) All fixtures, machinery, equipment and other Tangible Personal
Property included in this sale are owned free and clear of any liens and
encumbrances, except for the Permitted Exceptions.

          (p) To the Knowledge of Contributor, the guaranties and warranties
attached hereto as Exhibit K are all of the guaranties and warranties currently
                   ---------                                                   
in effect with respect to the Property and such guaranties and warranties are
true, complete and correct, and in full force and effect 

                                       23
<PAGE>
 
as of the date hereof. This representation and warranty shall survive the
Closing for a period of ninety (90) days.

          (q) Other than as set forth in Schedule 1.1(k), there are no service,
                                         ---------------                       
maintenance, employment or any other similar contracts or agreements that now
affect the Property and to which Contributor is a party.  This representation
and warranty shall survive the Closing for a period of ninety (90) days.

          (r)  Omitted.

          (s) Schedule 5.1(s) is a full and complete schedule of the documents
              ---------------                                                 
comprising the Hancock Mortgage. Contributor shall not modify, amend, supplement
or waive any provision of the Hancock Mortgage on or prior to the Closing Date
without the prior written consent of Partnership which consent shall not be
unreasonably withheld, conditioned or delayed, the Partnership agreeing that (i)
if within ten (10) business days of receipt of a notice from Contributor seeking
its consent to a modification, amendment, supplement or waiver of any provision
of the Hancock Mortgage it shall either (x) consent thereto in writing or (y)
set forth in writing its reasons for failing to so consent, failing which it
shall be deemed to have consented, and (ii) it will consent to the waiver of any
provisions of Section 6 of the December 29, 1995 Mortgage Modification
Agreement, or a modification of any provisions of such Section 6 provided such
modification does not adversely affect Partnership. Since December 29, 1995
Contributor has not received any notice of any default under the Hancock
Mortgage which remains uncured.  The Hancock Mortgage is not cross-
collateralized with any other loan or obligation of Contributor.

          (t) Except as set forth in Schedule 5.1(t), neither Contributor, nor
                                     ---------------                          
any of its parents, subsidiaries, or any member of any trade or business
(whether or not incorporated) that is under common control with Contributor
that, together with the Property, are treated as a single employer under Section
414(b), (c), (m) or (o) of the Code ("ERISA Affiliate") maintains or has
                                      ---------------                   
maintained, contributes to or has contributed to, any employee pension benefit
plan as defined in Section 3(2) of the Employee Retirement Income Security Act
of 1974, as amended ("ERISA") (including a multiemployer plan as defined in
                      -----                                                
Section 4001(a) (3) of ERISA) that is covered by Title IV of ERISA or subject to
the minimum funding standards of Section 412 of the Code 

                                      24
<PAGE>
 
("Plan"). No ERISA Affiliate has incurred (a) any liability to the Pension
  ---- 
Benefit Guaranty Corporation ("PBGC"), (b) any complete or partial withdrawal
                               ----
liability under Title IV of ERISA, or (c) any liability for continuing benefits
or coverage under any "welfare benefit plan" as defined in Section 3(1) of ERISA
for any participant or beneficiary of a participant after such participant's
termination of employment except as required by the Consolidated Omnibus
Reconciliation Act of 1985, as amended ("COBRA").
                                         -----   

          (u) Contributor has no Knowledge, except as disclosed in environmental
reports prepared for Contributor and delivered to Partnership or any
environmental reports prepared for Partnership and disclosed to Contributor,
that the Property contains any contamination from any Hazardous Substances or
that the Property is in violation of any Environmental Laws.

          (v) Neither the execution and delivery of this Agreement by
Contributor, nor compliance by Contributor with the terms and provisions of this
Agreement nor the consummation of the transactions contemplated under this
Agreement on the part of Contributor, will, except for the Hancock Mortgage,
violate any statute, license, decree, order or regulation of any Governmental
Authority, any contract or agreement, or any formation documents of Contributor,
or, except for the Hancock Mortgage, result in the creation or imposition of any
lien, charge or encumbrance of any nature whatsoever upon, or give to others any
interest or rights in, the Property.

          (w) Contributor has not (i) made a general assignment for the benefit
of creditors, (ii) filed any voluntary petition in bankruptcy or suffered the
filing of an involuntary petition by its creditors, (iii) suffered the
appointment of a receiver to take possession of all or substantially all of its
assets, (iv) suffered the attachment, or other judicial seizure of all, or
substantially all, of its assets, (v) admitted in writing its inability to pay
its debts as they come due, or (vi) made an offer of settlement, extension or
compromise to its creditors generally.

          (x) Contributor represents and warrants as follows:

               (i)  Contributor, Vic Associates, Gladwater Associates, Lucille
Gladstone, and Kenneth Gladstone are each an "accredited investor" as defined in
Rule 501(a) under the 

                                      25
<PAGE>
 
Securities Act of 1933, as amended (the "Securities Act"), and each understands
                                         --------------
the risks of, and other considerations relating to, the issuance of the Units
and its potential acquisition of shares of common stock (the "REIT Shares") of
                                                              ----------- 
Boston Properties, Inc., a Delaware corporation, with an address at 8 Arlington
Street, Boston, MA 02116, (the "REIT") pursuant to the redemption rights set
                                ----
forth in the Partnership Agreement. Contributor, Vic Associates, Gladwater
Associates, Lucille Gladstone, and Kenneth Gladstone, by reason of each of such
person's business and financial experience, together with the business and
financial experience of those persons, if any, retained by each of such persons
to represent or advise it with respect to its investment in the Units and
potential investment in the REIT Shares, has such knowledge, sophistication and
experience in financial and business matters and in making investment decisions
of this type that it (A) is capable of evaluating the merits and risks of an
investment in Partnership and potential investment in the REIT and of making an
informed investment decision, (B) is capable of protecting its own interest or
has engaged representatives or advisors to assist it in protecting its interests
and (C) is capable of bearing the economic risk of such investment. If any of
Contributor, Vic Associates, Gladwater Associates, Lucille Gladstone, and
Kenneth Gladstone retained a person to represent or advise it with respect to
the investment in Units and potential investment in the REIT Shares that may be
made hereby then, at Partnership's request, each such person that retained an
advisor shall, prior to or at the Closing, (1) acknowledge in writing such
representation and (2) cause such representative or advisor to deliver a
certificate to Partnership containing such representations as are reasonably
requested by Partnership.

               (ii)  Each of Contributor, Vic Associates, Gladwater Associates,
Lucille Gladstone, and Kenneth Gladstone understands that an investment in the
Partnership and/or the REIT involves substantial risks.  Each of such persons
has been given the opportunity to make a thorough investigation of the
activities of the Partnership and the REIT and has been furnished with materials
relating to the Partnership and the REIT and their respective activities
(including, but not limited to, the prospectus, dated June 17, 1997 of the REIT
and all reports subsequently filed with the Securities and Exchange Commission
pursuant to Section 13 of the Securities Exchange Act of 1934).  Each of such
persons has been afforded the opportunity to obtain any additional information
deemed necessary by such person to 

                                      26
<PAGE>
 
verify the accuracy of any representations made or information conveyed to such
person. Each of such persons confirms that all documents, records, and books
pertaining to its investment in the Partnership and potential investment in the
REIT and which were requested by such person have been made available or
delivered to such person. Each of such person has had an opportunity to ask
questions of and receive answers from Partnership and the REIT, or from a person
or persons acting on their behalf, concerning the terms and conditions of this
investment.

                 (iii) The Units to be issued and any REIT Shares issued in
connection with the redemption of the Units will be acquired for the account of
the acquirer for investment only and not with a current view to, or with any
intention of, a distribution or resale thereof, in whole or in part, or the
grant of any participation therein, without prejudice, however, to Contributor's
right (subject to the terms of the Units and the REIT Shares) at all times to
sell or otherwise dispose of all or any part of its Units or REIT Shares under
an exemption from such registration available under the Securities Act, and
applicable state securities laws, and subject, nevertheless, to the disposition
of its assets being at all times within its control. Contributor was not formed
for the specific purpose of acquiring an interest in Partnership or the REIT.

                 (iv) Contributor acknowledges that (A) neither the Units to be
issued, nor the REIT Shares issuable upon redemption of the Units to Contributor
have been registered under the Securities Act or state securities laws by reason
of a specific exemption or exemptions from registration under the Securities Act
and applicable state securities laws, (B) the reliance by the Partnership and
the REIT on such exemptions is predicated in part on the accuracy and
completeness of the representations and warranties of Contributor contained
herein, (C) such Units or REIT Shares, therefore, cannot be resold unless
registered under the Securities Act and applicable state securities laws, or
unless an exemption from registration is available, (D) there is no public
market for such Units, and (E) neither the Partnership nor the REIT has any
obligation or intention to register such Units or any REIT Shares that may be
acquired hereby for resale under the Securities Act or any state securities laws
or to take any action that would make available any exemption from the
registration requirements of such laws except as provided in the Lock-Up and
Registration Rights Agreement. Contributor hereby acknowledges that because of
the

                                      27
<PAGE>
 
restrictions on transfer or assignment of such Units acquired hereby or any REIT
Shares which may be acquired upon redemption of the Units which are set forth in
the Partnership Agreement and/or in a Registration Rights Agreement in the form
set forth as Exhibit "J" hereto (the "Lock-Up and Registration Rights
Agreement"), Contributor may have to bear the economic risk of the investment
commitment evidenced by this Agreement and any Units acquired hereby or any REIT
Shares that may be acquired upon redemption of the Units for an indefinite
period of time.

      5.2 Partnership's Right To Terminate.  Without limiting any of the rights
          --------------------------------                                     
of Partnership elsewhere provided for in this Agreement, it is agreed that the
obligation of Partnership to close title under this Agreement is conditioned
upon the material accuracy of all of Contributor's warranties and
representations hereunder and the due compliance in all material respects by
Contributor of all of its agreements set forth herein and elsewhere in this
Agreement.  If, on or before the Closing Date, Partnership determines that any
of Contributor's representations or warranties are materially untrue, then,
prior to Closing, as its sole and exclusive remedy, Partnership may elect to
terminate this Agreement by notice given to Contributor in which event this
Agreement shall terminate and the parties shall be free of all liability to each
other under this Agreement except with respect to those obligations which
survive the termination of this Agreement; provided, however, that if
                                           --------  -------         
Partnership makes such determination prior to or at the Closing, it shall give
to Contributor notice and a reasonable opportunity (not exceeding 30 days) to
cure prior to making its election to terminate this Agreement.

      5.3 Contributor's Covenants.  Contributor covenants that, between the date
          -----------------------                                               
hereof and the earlier to occur of the termination of this Agreement and the
Closing Date:

          (a) Contributor will not modify, cancel, extend or otherwise change in
any manner any of the terms, covenants or conditions of the Hancock Mortgage
(except as contemplated by Section 5.1(s)), the insurance policies insuring the
Property, or any other material agreements affecting the Property which are to
be in effect subsequent to the Closing, unless obligated by the provisions of
the Lease with Instinet Corporation to do so regarding the Instinet Corporation
Lease.  Except as may be expressly permitted hereunder, Contributor will not
modify, cancel (except in the event of a default by the tenant thereunder beyond
the expiration of any applicable grace periods) or extend any of the Leases or

                                      28
<PAGE>
 
enter into any new leases for space in the Property without the prior written
consent of Partnership, which consent shall not be unreasonably withheld,
conditioned or delayed and shall be deemed granted if within ten (10) business
days of a notice requesting a consent, Partnership fails to respond to said
notice with reasons for declining to consent.

          (b) Contributor will not enter into any employment contract, service
contract or any other agreement in respect of any of the Property, except
contracts terminable at or prior to Closing, without the prior written consent
of Partnership, which consent shall not be unreasonably withheld, conditioned or
delayed.

          (c) Contributor shall maintain the Property and all plumbing, heating,
ventilating, air conditioning, electrical and other mechanical systems and
equipment servicing the Property in the same manner as maintained prior to the
date hereof and shall maintain in full force and effect all of the insurance
policies listed on Exhibit L hereto or appropriate substitute policies.
                   ---------                                           

          (d) Contributor agrees to make available for Partnership's
examination, promptly after the date hereof, and thereafter from time to time,
all records, statements and accounts bearing on or relating to the operation of
the Property and expenditures made in connection therewith.

          (e) Except as may be otherwise specifically addressed in Schedule
                                                                   --------
5.1(f) hereof, Contributor, at or prior to Closing, shall satisfy all tenant
- ------                                                                      
improvement obligations, work letters, construction obligations, rent allowances
and leasing commissions which have accrued through the Closing, if any, relating
to the Property.

          (f) Contributor agrees to provide Partnership's auditors or financial
advisors with reasonable access to all financial information relating to the
ownership and operations of the Property by Contributor in Contributor's
possession that is reasonably deemed necessary by said auditors or financial
advisors for purposes of preparing such audited financial statements for the
Property as are required by Rule 3-14 under Regulation S-X under the Securities
Exchange Act or in connection with the financial statement requirements of Form
8-K under the Securities Act of 1934.

      5.4 Survival of Representations.  All of the representations and
          ---------------------------                                 
warranties of Contributor set forth in 

                                      29
<PAGE>
 
this Agreement made by Contributor, as of the date of this Agreement, shall also
be deemed made as of the Closing Date. A breach of any of Contributor's
representations or warranties made herein which expressly provide that such
representation or warranty survives the Closing, shall, if the Closing occurs,
and subject to Section 8.1 (b), be enforceable after the Closing Date but only
(i) to the extent such representation or warranty was not materially true on the
date hereof and on the Closing Date, and (ii) a claim with respect to such
breach is made within the survival period.


                                  SECTION 6.
       REPRESENTATIONS, WARRANTIES AND COVENANTS OF PARTNERSHIP AND REIT
       -----------------------------------------------------------------

      6.1 Partnership's and REIT's Representations.  As a material inducement to
          ----------------------------------------                              
Contributor to enter into this Agreement and to consummate the transactions
contemplated hereby, Partnership and the REIT, hereby severally make to
Contributor the representations and warranties set forth in this Section 6,
which representations and warranties shall be true as of the date hereof in all
material respects and shall be true on the Closing Date in all material respects
and shall survive the Closing for a period of eighteen (18) months.

          (a) The Partnership is duly formed and in good standing as a limited
partnership of the State of Delaware and is authorized to do business in the
State of New York. The REIT is a corporation duly organized in the State of
Delaware and is the sole general partner of the Partnership. The REIT is
authorized to do business in the State of New York and is in good standing under
the laws of the State of New York.

          (b) The Partnership has all requisite partnership power and authority
to carry on its business as it is currently being conducted, to accept title to
the Property as herein contemplated  and to execute, deliver and perform this
Agreement and all documents to be executed and delivered in regard to the
consummation of the transactions contemplated hereby and to perform fully its
obligations hereunder and thereunder.  The execution, delivery and performance
by the Partnership of this Agreement and all documents to be executed and
delivered in regard to the consummation of the transaction contemplated hereby
have been duly authorized by 

                                      30
<PAGE>
 
all necessary partnership action on the part of the Partnership, and the
Partnership shall, upon request of Contributor, deliver evidence of such
authority at or prior to the Closing.

          (c) This Agreement has been, and all documents to be executed and
delivered in regard to the consummation of the transaction contemplated hereby
and the Partnership Agreement will be at or prior to Closing, duly executed and
delivered by the Partnership and REIT, as applicable, and (assuming the due
authorization, execution and delivery by the other parties hereto and thereto)
this Agreement and the Partnership Agreement constitute, and all documents to be
executed and delivered in regard to the consummation of the transaction
contemplated hereby when so executed and delivered will constitute, legal, valid
and binding obligations of the Partnership and the REIT, if a party thereto,
enforceable against the Partnership and the REIT, if a party thereto, in
accordance with their respective terms, subject to applicable bankruptcy,
insolvency, reorganization, moratorium and similar laws affecting creditors'
rights and remedies generally and subject, as to enforceability, to general
principles of equity (regardless of whether enforcement is sought in a
proceeding at law or in equity).

          (d) Neither the execution and delivery of this Agreement, nor
compliance with the terms and provisions hereof on the part of Partnership or
the REIT as applicable, and consummation of the transactions contemplated
hereby, will violate any statute, license, decree, order or regulation of any
Governmental Authority, or will, at the Closing Date, breach, conflict with or
result in a breach of any of the terms, conditions or provisions of any material
agreement or instrument to which Partnership or the REIT is a party, or by which
either of them is or may be bound, or constitute a default thereunder, or result
in the creation or imposition of any lien, charge or encumbrance of any nature
whatsoever upon, or give to others any interest or rights in, the Units to be
issued to Contributor.

          (e) Neither Partnership nor the REIT has (i) made a general assignment
for the benefit of creditors, (ii) filed any voluntary petition in bankruptcy or
suffered the filing of an involuntary petition by Partnership's or the REIT's
creditors, (iii) suffered the appointment of a receiver to take possession of
all or substantially all of Partnership's or the REIT's assets, (iv) suffered
the attachment, or other judicial seizure of all, or substantially all, of

                                      31
<PAGE>
 
Partnership's or the REIT's assets, (v) admitted in writing its inability to pay
its debts as they come due, or (vi) made an offer of settlement, extension or
compromise to its creditors generally.

          (f)  The Partnership Agreement of Partnership delivered to Contributor
is a true and complete copy thereof (except that Exhibit A annexed thereto is
incomplete), has not been modified or amended, and Partnership and REIT shall
not amend the Partnership Agreement prior to Closing in any way that will
materially adversely affect Contributor as a member of the Partnership; REIT
shall amend the Partnership Agreement to permit limited partners to pledge their
Units in a manner consistent with Section 2(a) of the Lock-Up and Registration
Rights Agreement.

          (g)  The Units to be issued to Contributor hereunder have been duly
authorized for issuance to Contributor and, upon such issuance, will be validly
issued, fully paid and non-assessable and will not be subject to any preemptive
rights upon their issuance.

          (h)  No consent, waiver, approval or authorization of, or filing,
registration or qualification with, or notice to, any Governmental Authority or
any other Person is required to be made, including, but not limited to, any
governmental bodies, agencies, tenants, partners or lenders, in connection with
the execution, delivery and performance of this Agreement.

          (i)  Partnership qualifies as a partnership for Federal income tax
purposes.

          (j)  The written information set forth on Schedule 6.1(j) hereto
pertaining to Partnership and the REIT that has been furnished to Contributor by
Partnership in connection with its purchase of Units did not contain, as of the
date thereof, an untrue statement of a material fact and did not omit, as of
such date, to state a material fact necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading; and there has been no material adverse change since the date of such
written information.

          (k)  Unless and until the Board of Directors of the REIT determines
that it is not in the best interest of the REIT to qualify as a real estate
investment trust under the

                                       32
<PAGE>
 
Code, the REIT covenants that it shall operate its business in a manner to
qualify, and intends to make an election to qualify, as a real estate investment
trust under the Code commencing with its taxable year ending December 31, 1997.

          (l) Partnership covenants that it shall cooperate with Contributor and
provide to Contributor or Hancock, as required, the documents required by the
Hancock Mortgage to be provided by a transferee of the Property to obtain the
Hancock consent to the transaction contemplated by this Agreement.

      6.2 Contributor's Right To Terminate.  Without limiting any of the rights
          --------------------------------                                     
of Contributor elsewhere provided for in this Agreement, it is agreed that the
obligation of Contributor to close title under this Agreement is conditioned
upon the material accuracy of all of Partnership's and REIT's warranties and
representations hereunder and the due compliance by Partnership  and REIT of all
of its agreements set forth in this Agreement.  If, on or before the Closing
Date, Contributor determines that any of Partnership's or REIT's representations
or warranties are untrue, then, in addition to any other legal remedies
available to Contributor, Contributor may, prior to Closing, elect to terminate
this Agreement by notice given to Partnership, in which event this Agreement
shall terminate and the parties shall be free of all liability to each other
under this Agreement, except with respect to those obligations which survive the
termination of this Agreement, provided, however, that if Contributor makes such
                               --------  -------                                
determination prior to or at the Closing, it shall give to Partnership notice
of same and a reasonable opportunity (not exceeding 30 days) to cure prior to
making its election to terminate this Agreement.

      6.3 Survival of Representations.  All of the representations and
          ---------------------------                                 
warranties of Partnership or REIT set forth in this Agreement, made by either
REIT or Partnership, as the  case may be, as of the date of this Agreement,
shall also be deemed made as of the Closing Date.  A breach of any of either
REIT's or Partnership's representations or warranties made herein which
expressly provide that such representations or warranties survive the Closing,
shall be enforceable after the Closing Date to the extent such representations
or warranties were not true on the date hereof and on the Closing Date.

                                       33
<PAGE>
 
                                  SECTION 7.
                            CLOSING AND ADJUSTMENTS
                            -----------------------

      7.1 Closing.  The closing of the transaction contemplated herein (the
          -------                                                          
"Closing") shall be held at the offices of Weil, Gotshal & Manges LLP, 767 Fifth
- --------                                                                        
Avenue, New York, NY, on October 31, 1997 (the "Closing Date"), commencing at
                                                ------------                 
10:00 a.m. and shall continue until completion, unless the parties mutually
agree in writing upon another place, time or date.

      7.2 Possession.  Legal possession of the Property shall be delivered to
          ----------                                                         
Partnership at the Closing, subject to the Permitted Exceptions.

      7.3 Apportionments and Payments.  With respect to the Property, the
          ---------------------------                                    
following shall be apportioned between Contributor and Partnership as of 11:59
P.M. of the day immediately preceding the Closing Date and the net amount
thereof shall either be paid by Partnership to Contributor, or by Contributor to
Partnership, at the Closing:

          (a) Taxes.  Real property taxes and general and special assessments
              -----                                                          
upon the Property shall be adjusted and prorated, as of the Closing Date on the
basis of the fiscal year for such taxes and assessments (the "Tax Year").  If
                                                              --------       
the Closing shall occur before the real property tax rate for the Tax Year is
fixed, the apportionment of taxes shall be made on the basis of the taxes
assessed for the preceding Tax Year.  After the real property taxes are finally
fixed for the Tax Year in which the Closing occurs, Partnership and Contributor
shall make a recalculation of the apportionment of such taxes, and Partnership
or Contributor, as the case may be, shall make an appropriate payment to the
other based on such recalculation.  To the extent that either the Contributor or
Partnership shall obtain any real estate tax abatement with respect to the
Property which is applicable to the year in which the Closing occurs, the amount
of the net proceeds of such tax abatement shall be prorated through the Closing
Date if, as and when such proceeds are paid or applied (and if applied,
Partnership shall promptly after notice of such application remit to Contributor
its share) by the applicable Governmental Authority (it being understood that to
the extent any tenant shall be entitled to any portion of such tax abatement,
that such portion shall be turned over to Partnership to remit to such tenant
and shall be deducted from any tax abatement proceeds in connection with
calculating the net proceeds thereof).  If Partnership 

                                       34
<PAGE>
 
receives any real estate tax refund applicable to any year prior to the year in
which the Closing occurs, or if any such tax abatement is applied, then
Partnership shall immediately remit any such refund or amount applied to
Contributor (it being understood that to the extent any tenant shall be entitled
to any portion of such tax abatement, that such portion shall be turned over to
Partnership to remit to such tenant and shall be deducted from any tax abatement
proceeds in connection with calculating the net proceeds thereof).

          (b) Certiorari:  If any certiorari or other proceedings for the
              ----------                                                 
reduction of real estate taxes are pending at the Closing Date, Partnership
shall take over the prosecution of such action with counsel of Partnership's
choice; provided, however, that Partnership will not settle or compromise such
        --------  -------                                                     
pending action other than for immediate payment without Contributor's prior
written consent.  Any tax refund resulting from such proceeding, net of
Contributor's and Partnership's costs of prosecuting the same, and after
deducting any refunds required to be made to tenants pursuant to Leases, shall
be apportioned between Contributor and Partnership in the same proportion that
real estate taxes for such tax year are apportioned.

          (c) Utilities:  If the Closing shall occur before the actual amount of
              ---------                                                         
utilities, water or sewer meter charges or other operating expenses with respect
to the Property for the month in which the Closing occurs are determined, the
apportionment of such utilities, water or sewer meter charges or other operating
expenses shall be upon the basis of a reasonable estimate by Contributor of such
utilities, water or sewer meter charges or other operating expenses for such
month.  Subsequent to the Closing, when the actual amount of such utilities,
water or sewer meter charges or other operating expenses with respect to the
Property for the month in which the Closing occurs are determined, the parties
agree to adjust the proration of such utilities, water or sewer meter charges or
other operating expenses and, if necessary, to refund or repay such sums as
shall be necessary to effect such adjustment.

          (d) Rents.  Except as provided in Section 9.3 or 9.4, prepaid rent,
              -----                                                          
nondelinquent rents, delinquent rents, operating expense recoveries, tax
reimbursements under the Leases and any other sums payable as rent or additional
rent under any of the Leases (collectively, "Rents") shall be adjusted and
                                             -----                        
prorated as of the Closing Date as follows:

                                       35
<PAGE>
 
          (1) With respect to prepaid Rents received by Contributor prior to the
Closing Date relating to the calendar month in which the Closing occurs or
thereafter, such Rents shall be adjusted at the Closing between Contributor and
Partnership.

          (2) With respect to delinquent Rents which, as of the Closing Date,
are delinquent for a period of no greater than one (1) month, to the extent that
Partnership receives such Rents under the Leases (including monthly payments of
escalation rents and "pass throughs"), which Rents relate to the period of time
prior to the Closing Date, Partnership shall render an accounting to Contributor
with respect thereto, and the amount of such Rents shall be applied in the
following order of priority:  (i) first, to the calendar month in which the
Closing occurred, (ii) then to the calendar month(s) following the calendar
month in which the Closing occurred, and (iii) then to the calendar month(s)
immediately preceding the calendar month in which the Closing occurred, until
such tenant is current on Rents.

          (3) At the end of the fiscal year in which the Closing occurs with
respect to which escalation rents and "pass throughs" are payable under each
Lease, there shall be a calculation of the portion of such rents to which
Contributor shall be entitled, which portion shall be equal to a fraction, the
numerator of which is the number of days in said fiscal year with respect to
each such Lease which elapsed prior to the Closing Date and the denominator of
which is the total number of days in said fiscal year, and Partnership shall be
entitled to the remaining portion of such Rents.  If Contributor has received
escalation rents or "pass throughs" with respect to any Lease for a fiscal year
in excess of the amount to which it is entitled pursuant hereto, such excess
shall be paid by Contributor to Partnership within ten (10) business days after
the date of such calculation.  If Partnership has received escalation rents or
"pass throughs" with respect to any Lease for such fiscal year in excess of the
amount to which it is entitled pursuant hereto, such excess shall be paid by
Partnership to Contributor within ten (10) business days after the date of such
calculation.

          (4) If any tenant shall dispute the calculation of any escalation
rents or "pass throughs" relating to the period prior to the Closing Date, or
there shall be a reconciliation of such amounts and such dispute or
reconciliation shall result in a rent credit being owed to 

                                       36
<PAGE>
 
any such tenant, then Contributor shall remit such amount to Partnership and
Contributor shall indemnify and hold Partnership harmless from any and all
claims, suits, actions, damages and expenses resulting from Contributor's
failure to remit such sums.

              (5) After Closing, Partnership shall bill tenants for unpaid
escalation rents and "pass throughs" as required by the Leases.  Partnership
shall use reasonable business efforts to collect any and all rents due pursuant
to the Leases.  After Closing, Contributor shall have no right to commence any
legal proceedings or take other actions to collect any amounts which may be owed
by any Tenants.

              (6) With respect to additional rent due for services provided by
Contributor to tenants prior to Closing, such as, by way of example only,
overtime HVAC, freight elevator, and special cleaning, Contributor shall bill
such tenants for all services performed for such tenants prior to the Closing
Date and Contributor shall be entitled to receive the full amount so billed.
If, after the Closing Date, Partnership receives any payments on account of any
such bill, Partnership shall immediately remit the amount so received to
Contributor.

          (e) Fuel Oil.  Fuel oil at the Property shall be apportioned as of the
              --------                                                          
Closing Date at Contributor's cost therefor as evidenced by bills for deliveries
made within three (3) days of Closing.

          (f) Service Contracts.  Charges under service contracts, to the extent
              -----------------                                                 
the same are assignable and are assigned to, and assumed by, Partnership, or
otherwise taken subject to, shall be apportioned as of the Closing Date.

          (g) License/Permit Fees.  Annual license, permit and inspection fees,
              -------------------                                              
provided that Contributor's rights thereunder (or with respect thereto) are
transferable and are transferred to Partnership shall be apportioned as of the
Closing Date.

          (h) Wages.  Wages, payroll taxes, welfare benefits, accrued vacation
              -----                                                           
and sick leave pay and other fringe benefits for any employees located at the
Property who provide services with respect to the Property shall be apportioned
based on the period covered by such expenses and/or accruals.

                                       37
<PAGE>
 
          (i) Security Deposits.  An amount equal to all Tenant security
              -----------------                                         
deposits and interest accrued thereon (but only to the extent such interest is
payable to a tenant), if any as of the Closing Date, held by, or required to be
held by, Contributor shall be paid over to Partnership at the Closing and the
appropriate notice of such transfer shall be delivered to the applicable Tenant.

          (j) Hancock Fund Adjustment.  The sum of $500,000 shall be paid to
              -----------------------                                       
Contributor, representing a portion of the fund or account held by Hancock
pursuant to the Hancock Mortgage, as contemplated by Section 9.2.

          (k) Escrow Reimbursement.  At the Closing, at the election of
              --------------------                                     
Contributor, Partnership shall either (i) remit to Urban Poole Financial, the
escrow agent for Hancock, the amount held by it, to the extent sums, including
any interest, are held for taxes to be incurred after the Closing, or (ii) pay
such amount directly to Contributor.

          (l) Other Apportionments.  Except as otherwise provided for herein,
              --------------------                                           
the Customs In Respect to Title Closings recommended by The Real Estate Board of
New York, Inc. shall apply with respect to all apportionments under this
Agreement.

      7.4 Timing of Calculations; Cooperation.  Contributor and Partnership
          -----------------------------------                              
agree to use reasonable efforts to reconcile, prorate and adjust all of the
foregoing items within five (5) business days before the Closing Date.  In the
event any adjustments or prorations made pursuant to this Agreement are,
subsequent to the Closing, found to be erroneous, then either party hereto who
is entitled to additional amounts shall invoice the other party for such
additional amounts as may be owing, and such amounts shall be paid promptly by
the other party upon receipt of invoice.  Such invoice shall be accompanied by
reasonable substantiating evidence.  The provisions of this Section shall
survive the Closing.

      7.5 Closing Costs.  Partnership shall pay, on the Closing Date, the title
          -------------                                                        
insurance premium for the Title Policy, any survey charges, any recording and
filing charges and fees to record the documents evidencing the conveyance of the
Property and all costs and charges of the Closing and consummation of the
purchase and sale transaction contemplated in this Agreement as customarily
charged to and payable by Partnership in such transactions in New York City.
Contributor shall pay, on the Closing Date, the New York 

                                       38
<PAGE>
 
State Real Estate Transfer Tax and New York City Real Property Transfer Tax
imposed on the conveyance of the Property and all other customary fees, costs
and charges of the closing and consummation of the purchase and sale transaction
contemplated in this Agreement as customarily charged to and payable by the
Contributor in such transactions in New York. Notwithstanding the foregoing,
each party shall pay its own attorneys' fees and the fees of any accountants
and/or advisers incurred, in connection with the transactions contemplated in
this Agreement.

      7.6 Contributor's Obligations at the Closing.  On or prior to the Closing,
          ----------------------------------------                              
unless waived by Partnership in its sole discretion (provided, however, the
                                                     --------  -------     
conditions set forth in Section 7.6(n) and Section 7.6(cc)(ii) cannot be
waived), the Contributor shall fulfill the following conditions and deliver or
cause to be delivered the items set forth in subparagraph 7.6(c) through (ee) to
Partnership or as directed by Partnership, at Contributor's sole cost and
expense, the following:

          (a) Representations and Warranties.  The representations and
              ------------------------------                           
warranties made by Contributor in Section 5 hereof shall be true and correct in
all material respects on and as of the Closing Date as though such
representations and warranties were made on and as of such date.

          (b) Performance.  Contributor shall have performed and complied in all
              -----------                                                       
material respects with all agreements, obligations, covenants and conditions
required herein to be performed or complied with by Contributor on or prior to
the Closing Date.

          (c) Deed.  Bargain And Sale Deed Without Covenants Against Grantor's
              ----                                                            
Acts (containing standard language regarding compliance with Section 13 of the
Lien Law of the State of New York) for the Property (the "Deed" in form annexed
                                                          ----                 
hereto as Exhibit M), so as to convey to Partnership good and insurable fee
          ---------                                                        
simple title to the Property, free and clear of (except as otherwise provided in
Section 4.1(c)) (i) all mortgages (except for the Hancock Mortgage) and liens
and (ii) all other encumbrances whatsoever including all other title exceptions
except for Permitted Exceptions, which Deed shall be in recordable form, duly
executed and acknowledged. Contributor shall execute and deliver to Partnership,
on the delivery of the Deed at the Closing or, at Partnership's option,
thereafter, on demand, all proper instruments for the assignment and collection
of any Award.

                                       39
<PAGE>
 
          (d) Assignment and Assumption of the Ground Lease. An Assignment and
              ---------------------------------------------                   
Assumption of the Ground Lease in form annexed hereto as Exhibit N.

          (e) Bill of Sale.  A bill of sale (the "Bill of Sale") in the form of
              ------------                        ------------                 
Exhibit "C" annexed hereto and made a part hereof, conveying, transferring and
- -----------                                                                   
selling to Partnership all right, title and interest of Contributor in and to
all of the Tangible Personal Property and any other personal property of
Contributor being sold to Partnership, if any, which Bill of Sale shall contain
a warranty that such property is free and clear of all liens, encumbrances and
security interests (other than the Permitted Exceptions). Partnership and
Contributor hereby agree that no portion of the Contribution Amount is allocated
to the Tangible Personal Property.

          (f) Certificate of Occupancy.  The permanent certificate of occupancy
              ------------------------                                         
for the Improvements, together with copies, to the extent available, of any and
all other material certificates, permits or licenses that are necessary for, and
issued in relation to, the normal occupancy and operations of the Improvements.
For purposes hereof, "material" shall mean those items which if not obtained
would have a material adverse effect on the use, occupancy, ownership or net
operating income of the applicable Property. This subsection is a condition only
and not a covenant by Contributor.

          (g) Licenses and Permits.  Originals or copies of all (i)
              --------------------                                 
certificates, inspections, licenses and permits, which for the purpose of this
subsection shall not include the certificate of occupancy, pertaining to the
Property or which may be required for the use or occupancy thereof, if any, (ii)
records and other documents pertaining to the ownership, operation and
maintenance of the Property as may be in Contributor's possession and (iii) the
most recent "as-built" set of specifications and plans for the design and
supervision of the construction of the Buildings as may be in Contributor's
possession.  This subsection is a condition only and not a covenant by
Contributor.

          (h) Guarantees and Warranties.  To the extent in effect, all
              -------------------------                               
assignable guarantees and warranties that Contributor has received in connection
with any construction, inspection, maintenance or other work or services
performed or to be performed with respect to, or equipment installed in, any of
the Property.

                                       40
<PAGE>
 
          (i) Lease Assignments.  Assignments and Assumptions of the Leases,
              -----------------                                             
Rents and Security Deposits (the "Assignment of Leases") in form attached hereto
                                  --------------------                          
as Exhibit E.
   --------- 

          (j) Leases.  Each Lease as well as all correspondence and notices
              ------                                                       
(which correspondence and notices are in Contributor's possession) between
Contributor and the tenants under the Leases and, to the extent in the
Contributor's possession, any building plans and specifications related to the
Leases.

          (k) FIRPTA.  An executed Affidavit of Non-Foreign Status, in form
              ------                                                       
acceptable to Partnership, certifying that Contributor is not a "foreign person"
pursuant to Section 1445 of the Internal Revenue Code of 1986, as amended, and
the regulations promulgated thereunder, in the form attached hereto as 
Exhibit F.
- ---------

          (l) Certificate.  In form and substance reasonably satisfactory to
              -----------                                                   
Partnership and Partnership's attorneys, a certificate of a general partner of
the Contributor certifying that annexed thereto is evidence of the consent of
the partners authorizing the transfer of the Property, to the extent required by
such partnership agreement.

          (m) Opinion.  Opinion of Contributor's counsel in form and substance
              -------                                                         
reasonably satisfactory to Partnership and Partnership's counsel as is
customarily requested for transactions of this type but not dealing with title
matters, but including an opinion that neither the consent of the limited
partners of Vic Associates nor of Gladwater Associates is required to consummate
the transaction contemplated by this Agreement.

          (n) Consent of Hancock.  The consent of Hancock to the transactions
              ------------------                                             
contemplated by this Agreement as pertain to Hancock, including proof of payment
of all fees and expenses owed to Hancock by Contributor as a result of this
transaction and obtaining said consent and such agreements as may be required by
provisions of the Hancock Mortgage including the consent, estoppel and waiver of
Hancock to permit the transfer of the Property pursuant to this Agreement.  This
subsection is a condition only which cannot be waived by Partnership; it is not
a covenant by Contributor.

          (o) Keys.  Copies of any keys in Contributor's possession to entrance
              ----                                                             
doors and equipment and utility rooms 

                                       41
<PAGE>
 
located in the Property, which keys shall be properly tagged for identification
and any equipment or computer software used in connection with operating the
heating, ventilating, air conditioning and other mechanical systems in the
Improvements.

          (p) Payment of Taxes.  At the Closing, Contributor shall deliver to
              ----------------                                               
Partnership such certified checks, or an official bank check as shall be
necessary for the satisfaction of all (i) transfer taxes, recording taxes and
charges, including document stamps in connection with this transaction, and (ii)
all other conveyance taxes which are the obligation of Contributor under law.

          (q) Other Agreements.  All consents, modifications, supplements,
              ----------------                                            
letters, certificates and other agreements otherwise reasonably required or
contemplated hereunder.

          (r) Contributor's Certificate.  A certificate from Contributor
              -------------------------                                 
certifying to Partnership that the representations, warranties contained in this
Agreement are true and correct in all material respects as of the Closing Date.

          (s)  Omitted.
               ------- 

          (t) Evidence of Authority.  Such organizational and authorizing
              ---------------------                                      
documents of each party comprising Contributor as shall be reasonably required
by the Title Company to evidence Contributor's authority to consummate the
transactions contemplated by this Agreement.

          (u) Assignment.  A duly executed and acknowledged counterpart
              ----------                                               
Assignment in the form attached to this Agreement as Exhibit D (the
                                                     ---------     
"Assignment").
 ----------   

          (v) Tenant Notices.  Duly executed notices to all tenants or lessees
              --------------                                                  
under the Leases in form attached hereto as Exhibit H.
                                            --------- 

          (w) Original Documents.  The original of all Leases, Equipment Leases,
              ------------------                                                
Contracts and Estoppel Letters.

          (x) Transfer Tax Forms.  All transfer tax and other tax returns,
              ------------------                                          
including the New York State Form TP-584 and the New York City RPT Form, which
Contributor is required by law to execute and acknowledge and to deliver, either

                                       42
<PAGE>
 
individually or together with Partnership, to any governmental authority as a
result of the sale, together with checks made payable to the appropriate
governmental authority in the required amounts.

          (y) Records and Files.  All records and files which are in the
              -----------------                                         
possession of Contributor relating to the current operation and maintenance of
the Property, including, without limitation, current tax bills, current water,
sewer, utility and fuel bills, payroll records, billing records for tenants,
repair and maintenance records and the like which affect or relate to the
Premises.  The parties agree to cooperate so that, to the extent practical,
deliveries of background records at or prior to the Closing which Partnership
desires to have delivered to it will be identified to the satisfaction of the
parties at the Closing without actual delivery and will be deemed delivered
although in fact retained in the management office located at the Premises.

          (z) Investor Questionnaire.  An executed investor questionnaire
              ----------------------                                     
executed by Contributor, Vic Associates, Gladwater Associates, Kenneth
Gladstone, Lucille Gladstone and such other Permitted Distributees as
Contributor may select (in substantially the form attached hereto as Exhibit I)
                                                                     --------- 
and a certificate by such signatory that the representations and warranties set
forth in such Person's questionnaire is true and correct on the date thereof.

          (aa) Lock-up and Registration Rights Agreement. Contributor shall
               -----------------------------------------                   
enter into a Lock-Up and Registration Rights Agreement dated the Closing Date in
substantially the form attached hereto as Exhibit J.
                                          --------- 

          (bb) Make Good Agreement.  Contributor shall at Closing enter into the
               -------------------                                              
Make Good Agreement in substantially the form of Exhibit Q (the "Make Good
                                                                 ---------
Agreement").
- ---------   

          (cc) (i)  The Tenant's Ground Lease Estoppel executed by Contributor
in the form annexed hereto as Exhibit B-2.

               (ii) The Ground Lease Estoppel executed by Hancock. This
subsection is a condition only, which cannot be waived by Partnership; it is not
a covenant by Contributor.

                                       43
<PAGE>
 
          (dd) The obligations of Contributor set forth in Section 5.3(f) shall
have been complied with in all material respects.

          (ee) Written designation of the Persons who are Permitted Distributees
as defined in the Make Good Agreement.

      7.7 Partnership's Obligations at the Closing.  On or prior to the Closing,
          ----------------------------------------                              
unless waived by Contributor in its sole discretion, Partnership and REIT, as
applicable, shall fulfill the following conditions and deliver or cause to be
delivered the items set forth in subparagraphs 7.7(c) through (m) to Contributor
or as directed by Contributor, at Partnership's sole cost and expense the
following:

          (a) Representations and Warranties.  The representations and
              ------------------------------                           
warranties made by Partnership and the REIT in Section 6 hereof shall be true
and correct in all material respects on and as of the Closing Date as though
such representations and warranties were made on and as of such date.

          (b) Performance.  Partnership and the REIT shall have performed and
              -----------                                                    
complied in all material respects with all agreements, obligations, covenants
and conditions required herein to be performed or complied with by Partnership
on or prior to the Closing Date.

          (c) Units.  A total of 890,869 Units issued in the name of Contributor
              -----                                                             
or appropriately designated and qualified Permitted Distributees in such amounts
as requested by Contributor in writing but in no event more than 890,869 Units
in total.

          (d) Evidence of Authority.  Such organizational and authorizing
              ---------------------                                      
documents of Partnership as shall be reasonably required by Contributor
authorizing Partnership's acquisition of the Property and issuance of the Units
pursuant to this Agreement and the execution of this Agreement and any documents
to be executed by Partnership at the Closing.

          (e) Assignment.  Duly executed and acknowledged counterparts of (i)
              ----------                                                     
Assignment, (ii) Assignment and Assumption of Ground Lease and (iii) Assignment
and Assumption of Leases, Rents and Security Deposits.

                                       44
<PAGE>
 
          (f) Transfer Tax Forms.  Duly executed and acknowledged transfer tax
              ------------------                                              
forms described in Section 7.6(x).
                   -------------- 

          (g) Opinion.  An opinion of Partnership's counsel, and of REIT's
              -------                                                     
counsel as applicable, in form and substance reasonably satisfactory to
Contributor and Contributor's counsel with respect to the legal existence and
good standing of Partnership and the REIT, respectively, the due authorization,
execution, delivery and enforceability of this Agreement, the Lock-Up and
Registration Rights Agreement, the Make Good Agreement and all other documents
to be delivered at the Closing by Partnership or the REIT, as applicable, that
the Units are validly issued and non-assessable, and the issuance of Units to
Contributor is exempt from registration under applicable federal and state Legal
Requirements, that the Partnership qualifies as a partnership for federal income
tax purposes, that the Partnership Agreement, as amended by the Second Amendment
to Agreement of Limited Partnership in substantially the form attached hereto as
Exhibit R, when such Second Amendment is duly executed and delivered by the REIT
and the Partnership, will be duly authorized, executed, delivered and
enforceable, and that the REIT is organized in conformity with the requirements
for qualification as a real estate investment trust for federal income tax
purposes.

          (h) Certificates and Organizational Documents.  A duly executed and
              -----------------------------------------                      
acknowledged secretary's certificate of the REIT certifying that annexed thereto
(i) is a true and correct copy of Partnership's Partnership Agreement and
Certificate of Limited Partnership and all amendments thereto, if any, as filed
in its jurisdiction of formation; and the same have not been otherwise limited,
modified or amended, and are in full force and effect, (ii) are duly adopted
resolutions authorizing the consummation of the transactions contemplated by
this Agreement on its own behalf and as general partner of Partnership on behalf
of the Partnership, (iii) is a true and correct copy of the REIT's Certificate
of Incorporation and By-laws and all amendments thereto and that such have not
been otherwise limited, modified or amended, and are in full force and effect,
and (iv) are good standing certificates of the REIT, and (v) are true copies of
all documents delivered by the REIT to Contributor in connection with this
transaction.

          (i) Incumbency.  An incumbency certificate certifying the authority of
              ----------                                                        
the officers of the REIT, in its own behalf and as general partner of
Partnership, to execute and deliver this Agreement and all related Closing
documents.

                                       45
<PAGE>
 
          (j) Partnership's Certificate.  A certificate from Partnership and the
              -------------------------                                         
REIT, as appropriate, certifying to Contributor that the representations and
warranties of Partnership and the REIT contained in this Agreement are true and
correct as of the Closing Date.

          (k) Lock-Up and Registration Rights Agreement. The REIT shall execute
              -----------------------------------------                        
and deliver to the Contributor the Lock-Up and Registration Rights Agreement
dated as of the Closing Date in substantially the form attached hereto as
Exhibit "J".
- ----------- 

          (l) Omitted.
              ------- 

          (m) Indemnity.  An indemnity agreement, in the form attached as
              ---------                                                  
Exhibit O in which Partnership indemnifies Contributor and each of its direct
and indirect partners and equity owners from any liability under the Hancock
Mortgage that occurred after Closing.

          (n) Agreements with Hancock.  Such agreements as may be required by
              -----------------------                                        
the Hancock Mortgage, including the consent, estoppel and waiver of Hancock, to
permit Hancock to approve transfer of the Property pursuant to this Agreement.

          (o) Assumption Agreements.  Such assumption agreements as Contributor
              ---------------------                                            
may reasonably request, consistent with this Agreement, so that the Partnership
assumes Contributor's liability under service contracts, Leases, brokerage
agreements and other agreements by which Contributor is now bound and which are
set forth or described in this Agreement and assigned or assumed by Partnership
and indemnifies Contributor from any claims with respect thereto accruing after
the Closing.

          (p) Make Good Agreement.  Partnership and REIT shall, at the Closing,
              -------------------                                              
execute and deliver to Contributor the Make Good Agreement.

          (q) Omitted.
              ------- 

          (r) Reserve  Account.  The payment due under Section 9.2., if any.
              ----------------                                              

          (s) Notice to Tenant.  A notice to any tenant in the form of Exhibit H
              ----------------                                                  
owing any funds to Contributor, other than rent, approved by Partnership to pay
such funds directly to Contributor.

                                       46
<PAGE>
 
          (t) Certification as to Unit Issuance.  A certificate of the REIT, as
              ---------------------------------                                
general partner of Partnership, certifying that Contributor has been or will be,
effective on such Closing Date, admitted as a limited partner of Partnership and
that Partnership's books and records indicate or will indicate that Contributor
is the holder of the number of Units which is called for pursuant to this
Agreement.

          (u) Escrow Reimbursement.  The payment due (if any) under Section
              --------------------                                         
7.3(k).

      7.8 Insurance.  Contributor's existing liability and property insurance
          ---------                                                          
pertaining to the Property shall be canceled as of the Closing Date, and
Contributor shall receive any premium refund due thereon.

      7.9 Merger.  Partnership will, at Closing, execute, acknowledge and
          ------                                                         
deliver to Contributor, a written instrument, in form reasonably approved by
Contributor, in which Partnership shall (a) represent to the Contributor at
Closing that Partnership knows, has examined and has investigated to
Partnership's satisfaction the books, records and leases of the Contributor as
well as the physical nature and condition of the Property, including the
existing building and Improvements and the Personalty, and has had, or has had
the opportunity to have, an environmental engineer, a structural engineer and a
mechanical engineer examine the Property, including, but not limited to, the
roof and basement thereof and all systems and mechanical apparatuses used
therein; and (b)(i) acknowledge that it has been advised by its engineers of the
condition of the Property and, notwithstanding any adverse matters reported to
it by its engineers, is nevertheless satisfied with the physical condition of
the Property; (ii) that neither Contributor nor any real state broker, agent,
officer, employee, servant or representative of Contributor has made any
representations whatsoever regarding the subject matter of this transaction or
any fact thereof including, without limitation, representations as to the
physical nature or condition of the Property, the existing leases or tenancies,
the existing or projected rents, existing or future expenses, the assets or
liabilities, fixed or contingent, of the Contributor or any other matter or
thing affecting or related to the Property or the operation thereof, except as
specifically set forth in this Agreement, and Partnership has agreed to close
hereunder with the Property "as is" and in its condition as of the date of
Closing, subject to the express provisions of this Agreement; and (iii)
Partnership has not relied upon and does 
 

                                       47
<PAGE>
 
not rely upon and Contributor is not liable for or bound in any manner by,
express or implied warranties, guaranties, promises, statements,
representations, "set-ups", proposals or information pertaining to the Property,
the rents, expenses and operations thereof made or furnished by Contributor or
by any real estate broker, agent, officer, employee, servant or other person
representing or purporting to represent the Contributor, to whomsoever made or
given, directly or indirectly, verbally or in writing, unless such warranties,
guaranties, promises, statements, representations or information are expressly
or specifically set forth in this Agreement.

     7.10 Full Performance.  Partnership agrees that the acceptance of the Deed
          ----------------                                                     
and Assignment and Assumption of the Ground Lease by Partnership shall be deemed
to be a full performance and discharge of every covenant, condition, agreement
and obligation on the part of Contributor hereunder and no representation,
warranty, agreement, covenant or condition, express or implied, of Contributor
shall survive the Closing except those which are herein specifically stated to
survive the Closing.

                                  SECTION 8.
                                    DEFAULT
                                    -------

     8.1  Breach by Contributor.
          --------------------- 

          (a) Pre-Closing.  In the event that Contributor shall breach or
              -----------                                                
default in the performance of any of its obligations to be performed prior to
Closing or fail to consummate the transaction contemplated by this Agreement for
any reason (except Partnership's breach or default under this Agreement or a
termination of this Agreement by Partnership or Contributor pursuant to a right
to do so under any provision hereof) and Partnership is ready, willing and able
to Close, Partnership, as Partnership's sole and exclusive remedy, may either:
(1) terminate this Agreement in which event this Agreement shall terminate and
neither party shall have any obligations hereunder to the other except with
respect to those obligations that survive termination of this Agreement; or (2)
except as herein limited, pursue the remedy of specific performance of
Contributor's obligations under this Agreement, provided that (i) any such suit
for specific performance must be filed within one hundred twenty (120) days
after Partnership first becomes aware of the breach or default by Contributor,
(ii) Partnership is not in breach or 

                                       48
<PAGE>
 
default in the performance of its obligations under this Agreement, and (iii)
Partnership has offered in writing to tender the Units if it is successful in
its action for specific performance. Nothing contained in this Agreement shall
provide Partnership with the right to sue for specific performance if
Contributor has failed in its efforts to fulfill all or any of the conditions
set forth in Sections 7.6(f), 7.6(n), or 7.6 (cc)(ii).

          (b) Post-Closing.  In the event that this transaction closes and
              ------------                                                 
Contributor shall have breached or defaulted in any material respect the
performance of any of its representations, warranties or covenants which by the
express terms of this Agreement survive the Closing, or if there is any breach
in a Contributor's Estoppel with respect to which a timely claim is made under
Section 3.2(c), unless such breach or default or misrepresentation was known by
Partnership at Closing, Partnership may pursue Contributor for actual damages,
provided Partnership asserts the claim within the survival period.  For the
purpose of this section, the phrase "known by Partnership" shall mean the actual
knowledge of Robert Selsam who shall be deemed to have actual knowledge of all
matters contained in documents set forth or referred to in this Agreement or in
schedules to this Agreement including Schedule 8.1(b).

Partnership hereby agrees that prior to its exercise of any right or remedy as a
result of any breach or default by Contributor, Partnership will first deliver
written notice of said breach or default to Contributor and give Contributor
thirty (30) days thereafter in which to cure said breach or default, if
Contributor so elects.

      8.2 Termination of this Agreement.  If any of the following shall occur,
          -----------------------------                                       
Partnership shall have the right, as its sole and exclusive remedy, to terminate
this Agreement upon notice to Contributor in which event neither party shall
have any further rights or obligations hereunder except for those obligations
which survive the termination of this Agreement:

          If (a) any of the Major Tenants shall have defaulted in a material
obligation beyond applicable notice and grace periods under their respective
Leases and such default remains uncured at the time of Closing, or (b) if any of
such Leases cease to be in full force and effect, or (c)if any Major Tenant has
(i) made a general assignment for the

                                       49
<PAGE>
 
benefit of creditors, (ii) filed any voluntary petition in bankruptcy or
suffered the filing of an involuntary petition by such Major Tenant's creditors,
or (iii) admitted in writing its inability to pay debts as they become due;

      8.3 Further Assurances.  Each party hereto and the REIT will, from time to
          ------------------                                                    
time, execute and deliver to the other all such other and further instruments
and documents and take or cause to be taken all such other and further action as
such party may reasonably request in order to effect the transactions
contemplated by this Agreement, including, but not limited to, instruments or
documents reasonably deemed necessary or desirable by such party to effect and
evidence the conveyance of the Property and the issuance of the Units in
accordance with the terms of this Agreement.

      8.4 Breach by Partnership.  In the event that Partnership fails to
          ---------------------                                         
consummate the transaction contemplated by this Agreement, Contributor may
terminate this Agreement, which shall be Contributor's sole remedy and relief
hereunder in which event this Agreement shall terminate and neither party shall
have any obligations hereunder to the other except with respect to those
obligations that survive termination of this Agreement.

                                  SECTION 9.
                               FUTURE OPERATIONS
                               -----------------

          9.1  Maintenance and Contracts.  From the date of this Agreement until
               -------------------------                                        
the Closing or earlier termination of this Agreement, Contributor will keep and
maintain the Property in substantially its condition as of the date of this
Agreement ordinary wear and tear and casualties excepted, maintain all Equipment
Leases and Contracts necessary for the proper maintenance of the Property, and
maintain all Tangible Personal Property in working order up to and at Closing.

          9.2  Relations with Hancock.  From the date of this Agreement until
               ----------------------                                        
the Closing, or the earlier termination of this Agreement, Contributor (and if
requested by Contributor, accompanied by the Partnership and REIT) shall
communicate with Hancock concerning the future operations of the Property, and
the Contributor, Partnership and the REIT shall cooperate and assist each other
in (a) submitting to Hancock the documentation and information required pursuant
to the Hancock Mortgage to obtain the consent of Hancock to this 

                                       50
<PAGE>
 
transaction, (b) endeavoring to obtain from Hancock (i) the release of (A)
Contributor and all of its direct and indirect partners from any liability under
the Hancock Mortgage and (B) the release to Contributor of $500,000 of the funds
from the Cash Collateral Account held pursuant to the Hancock Mortgage (which
the Partnership shall concurrently replenish), (ii) the termination of the
Ground Lease, (iii) waivers of various requirements in the Hancock Mortgage to
obtaining the consent to Hancock to the transactions contemplated by this
Agreement and (iv) the right of Contributor to participate in loan restructuring
and refinancing discussions which may occur when the Hancock Mortgage becomes
due. In the event that Hancock refuses to release to Contributor $500,000 now
held in the Cash Collateral Account Partnership shall, at the Closing, at the
election of Contributor, either pay to Contributor, by wire transfer the sum of
$500,000 or increase the Units delivered to Contributor at Closing, by the
number of Units obtained by dividing $500,000 by the greater of the closing
market price of the Shares of the REIT on the day prior to the Closing or
$28.0625. In addition to the foregoing, Contributor shall have the right to
obtain the release of up to $800,000 from the Cash Collateral Account to pay any
brokerage commissions due under the brokerage agreement identified in item 1 of
Schedule 5.1(f).

          9.3  Litigation with Dunn-Donnelley.  Partnership is aware that there
               ------------------------------                                  
is now pending litigation between Contributor, as plaintiff and Dunn-Donnelley
Publishing Corporation as defendant concerning claims with respect to rent due
under the lease between Contributor, as landlord, and Dunn-Donnelley Publishing
Corporation, as tenant, prior to the date hereof, and has been provided with
access to all of the papers prepared and filed in said litigation. Partnership
is also aware that, at the present time, a judgment in favor of Contributor has
been entered against Dunn-Donnelley Publishing Corporation on which there is now
due approximately $2 million, including interest, and that Dunn-Donnelley
Publishing Corporation is now appealing from said judgment.  Contributor and
Partnership agree that Contributor shall, at its sole cost and expense continue
to prosecute the litigation and shall be entitled to retain all proceeds of such
litigation including the proceeds from the judgment now entered and from any
order or judgment entered subsequently or from any settlement agreement it may
enter into with Dunn-Donnelley Publishing Corporation; provided, however, if a
settlement agreement involves any modification of the lease with Dunn-Donnelley
Publishing Corporation which would be adverse to the Property or Partnership,
Partnership

                                       51
<PAGE>
 
must consent to such modification provided neither the Property nor the
Partnership suffer adversely in any way from such consent.  Partnership
covenants that it shall not unreasonably withhold, condition or delay its
consent to any such modification.  Partnership will cooperate with Contributor
in its prosecution of such litigation and will, from time to time, execute,
acknowledge and deliver all documents at Contributor's expense which Contributor
shall reasonably request in connection with the prosecution and settlement of
such litigation.  Contributor shall indemnify and hold harmless Partnership from
any damage, cost, or claim, including reasonable attorneys fees, as a result of
the pending litigation with Dunn-Donnelley or any settlement.

          At the Closing Partnership shall execute and deliver to Contributor an
assignment from Partnership, as owner of the Improvements, to Contributor of all
of the rights of assignor, if any, to any and all claims in such litigation and
the proceeds thereof, such assignment to be in the form of Exhibit S.

          9.4  Reimbursements From Tenants.  In the event that after the Closing
               ---------------------------                                      
Partnership receives any funds from Instinet Corporation in payment of sums owed
Contributor pursuant to Section 9 of the Fifth Lease Amendment between Kenvic
Associates and Instinet Corporation dated the 14th day of June, 1996, which is
estimated to be $150,000, Partnership shall promptly remit said sum to
Contributor.  If requested by Contributor at Closing or thereafter, Partnership
shall notify Instinet Corporation to remit such sum directly to Contributor.

          9.5  Contributor Funds.  All funds whether held as cash, certificate
               -----------------                                              
of deposits or otherwise of the Contributor as of the Closing Date shall remain
the property of Contributor except for tenant security deposits which shall be
turned over to Partnership pursuant to the provisions of Section 7.3(i).

           9.6 Survival.  The provisions of Sections 9.3, 9.4 and 9.5 shall
               --------                                                    
survive the Closing.

                                  SECTION 10.
                                    BROKERS
                                    -------

          Broker.  Contributor represents and warrants that Contributor has not
          ------                                                               
retained the services of any broker in connection with the transactions
contemplated herein. 

                                       52
<PAGE>
 
Contributor agrees to defend, indemnify and hold Partnership harmless from any
loss, cost, damage, liability and expense, including, without limitation,
attorneys' fees and disbursements, arising out of any and all claims by any
broker or any other person, firm or corporation with whom Contributor has dealt
or who shall claim to have acted in this transaction on behalf of Contributor.
Partnership represents and warrants that Partnership has not dealt with any
broker in connection with the transactions contemplated hereunder. Partnership
agrees to defend, indemnify and hold Contributor harmless from any loss, cost,
damage, liability and expense, including, without limitation, attorneys' fees
and disbursements, arising out of any and all claims for brokerage commissions
made by any broker, person, firm or corporation with whom Partnership has dealt
or who shall claim to have dealt with Partnership. The provisions of this
Section 10 shall survive the Closing or earlier termination of this Agreement.

                                  SECTION 11.
                          CONDEMNATION AND DESTRUCTION
                          ----------------------------

      11.1 Condemnation.  If, prior to the Closing Date, all or any significant
           ------------                                                        
portion of the Property is taken by eminent domain (or is the subject of a
pending or contemplated taking that has not been consummated), then Contributor
shall immediately notify Partnership of such fact and Partnership shall have the
option to terminate this Agreement upon notice to Contributor given not later
than thirty (30) days after receipt of Contributor's notice and the provisions
of this Section shall apply.  For purposes of this Section, a "significant
                                                               -----------
portion" includes (i) office space greater than 1,000 sq. ft., (ii) any portion
- -------                                                                        
of the Improvements which may be replaced without diminution in office space of
more than 1,000 sq. ft. for a cost estimated by Partnership to exceed $50,000
(the "Threshold Amount") (iii) any means of ingress thereto or egress therefrom,
      ----------------                                                          
or (iv) any easements, utilities, services or view enjoyed by the Property,
provided, however, any such taking shall result in a material adverse effect on
- --------  -------                                                              
the use, occupancy, or value of the Property.  If Partnership does not exercise
this option to terminate this Agreement, or if an insignificant portion (i.e.,
                                                                         ---- 
not a significant portion) of the Property is taken by eminent domain, then
either (x) there shall be a fair and equitable adjustment of the Contribution
Amount, or (y) at the option of Partnership, in lieu of such adjustment,
Contributor shall assign and turn over, and Partnership shall 

                                       53
<PAGE>
 
be entitled to receive and keep, all rights to claim and receive all awards for
the taking by eminent domain.

      11.2 Casualty.  If a material part of any of (i) the Improvements, or (ii)
           --------                                                             
any means of ingress thereto or egress therefrom, is destroyed by fire, water or
other casualty ("material" herein deemed to be any destruction greater than
                 --------                                                  
"immaterial" as defined below), then Contributor shall notify Partnership of
- -----------                                                                 
such fact and Partnership shall have the option to terminate this Agreement upon
notice to Contributor given not later than thirty (30) days after receipt of
Contributor's notice and the provisions of this Section shall apply; provided,
                                                                     -------- 
however, that any such casualty shall result in a material adverse affect on the
- -------                                                                         
use, occupancy, or value of the Property.  If Partnership shall decide not to
terminate this Agreement, then at Closing Contributor shall assign all insurance
proceeds relating to such casualty to Partnership plus any deductible, but less
any sums necessary to reimburse it for expenses reasonably incurred to collect
such proceeds or perform repairs, and Partnership shall proceed to Closing in
accordance with the terms hereof.  In the event that there is damage to or
destruction of an immaterial part of any Improvements, means of ingress or
egress or the Tangible Personal Property by fire, water or other casualty, at
the election of Contributor either (x) the damage shall be repaired by
Contributor and the Closing Date shall be adjourned at Contributor's request for
one or more specified periods, not exceeding one hundred twenty (120) days in
the aggregate, in order to permit Contributor to make such repairs, or (y) at
the Closing, Contributor shall assign all insurance proceeds relating to such
casualty to Partnership, plus the deductible amount (less any sums necessary to
reimburse it for expenses reasonably incurred to collect such proceeds or to
perform necessary repair work), and Partnership shall proceed to Closing in
accordance with the terms hereof.  If Contributor elected the option under
clause (x), and if such repairs are not completed within said one hundred twenty
(120) day period, Partnership may elect: (1) to postpone the Closing Date for
one or more further periods until such repairs are completed, or (2) to close
notwithstanding that such repairs have not been completed, and Contributor shall
assign to Partnership all insurance proceeds relating to such casualty plus any
deductible, less any sums necessary to reimburse it for expenses reasonably
incurred to collect such proceeds or perform such work.  An "immaterial" part of
                                                             ----------         
any of the Improvements, means of ingress or egress or Tangible Personal
Property shall be deemed to have been damaged or destroyed if the total cost of

                                       54
<PAGE>
 
repair or replacement shall be the Threshold Amount or less, as long as ingress
and egress is nonetheless possible.

     11.3  Partnership and Contributor each hereby waives the New York Vendor
and Partnership Risk Act (GOL (S) 5-1311) and agree that the provisions of this
Section 11 shall govern the respective rights and obligations of Partnership and
Contributor with respect to the subject matter of this Section.

                                  SECTION 12.
                                 MISCELLANEOUS
                                 -------------

      12.1 Amendment.  This Agreement may not be changed, modified, supplemented
           ---------                                                            
or terminated, except by an instrument executed by all of the parties hereto.

      12.2 Mechanics' Liens.  In compliance with Section 13 of the Lien Law of
           ----------------                                                   
the State of New York, Contributor shall receive the Contribution Amount and
shall have the right to receive the Contribution Amount as a trust fund to be
applied first for the purpose of paying any contractor, subcontractor or
materialman in connection with the construction by Contributor of any
improvements on any of the Property and Contributor shall apply the same first
to the payment of same before using any of the Contribution Amount for any other
purpose.  The provisions of this Section shall survive the Closing.

      12.3 Entire Agreement.  This Agreement constitutes the entire agreement
           ----------------                                                  
among the parties hereto with respect to the transactions contemplated
hereunder.  Except as, and solely to the extent expressly set forth in this
Agreement, and the Exhibits and Schedules hereto, none of the parties hereto and
none of their respective employees, agents, officers or partners has made any
oral or written representations, warranties or statements of any nature or kind
whatsoever, whether express or implied, with respect to the transactions
contemplated under this Agreement.  Except as may be expressly set forth in this
Agreement or the exhibits or schedules hereto, Contributor is not relying on any
representations or warranties of Partnership or Partnership's agents or
employees.  Partnership acknowledges that Partnership has made independent
investigations and examinations of the Property and except as may be expressly
set forth in this Agreement or the exhibits or schedules hereto, Partnership is
not relying on any representations or 

                                       55
<PAGE>
 
warranties of Contributor or Contributor's agents or employees.

      12.4 Successors/Assigns.  This Agreement shall be binding upon, and shall
           ------------------                                                  
be enforceable by and inure to the benefit of, the parties hereto and their
respective heirs, legal representatives, successors and assigns; provided,
                                                                 -------- 
however, that this Agreement may not be assigned (except by operation of law) by
- -------                                                                         
any party without the prior written consent of the other parties, and any
attempted assignment without such consent shall be void and of no effect.

      12.5 Titles.  The titles and captions of the Articles, Sections and
           ------                                                        
paragraphs of this Agreement are included for convenience of reference only and
shall have no effect on the construction or meaning of this Agreement.

      12.6 Severability.  If any provision of this Agreement, or the application
           ------------                                                         
thereof, is for any reason held to any extent to be invalid or unenforceable,
the remainder of this Agreement and application of such provision to other
persons or circumstances will be interpreted so as reasonably to effect the
intent of the parties hereto.  The parties further agree to replace such void or
unenforceable provision of this Agreement with a valid and enforceable provision
that will achieve, to the extent possible, the economic, business and other
purposes of the void or unenforceable provision and to execute any amendment,
consent or agreement deemed necessary or desirable by Partnership to effect such
replacement.

      12.7 Equitable Remedies.  The parties hereto 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 subject to the limitations
of Section 8.1(a) to enforce specifically the terms and provisions hereof in any
federal or state court located in the State of New York (as to which the parties
agree to submit to jurisdiction for the purposes of such action), this being in
addition to any other remedy to which they are entitled under this Agreement.

      12.8 Governing Law.  This Agreement shall be governed by, and construed in
           -------------                                                        
accordance with, the laws of the State of New York, without giving effect to
choice of law principles.

                                       56
<PAGE>
 
      12.9 Omitted.
           ------- 

      12.10  Counterparts.  This Agreement may be executed in several
             ------------                                            
counterparts, each of which will be deemed an original and all of which shall
constitute one and the same instrument

      12.11  Notices.  Any notice, demand or communication that must or may be
             -------                                                          
given under this Agreement or by law shall, except as otherwise provided, be in
writing and shall be deemed to have been given (a) when physically received by
personal delivery or by telefax (which shall include the confirmed receipt of a
telecopied facsimile transmission), or (b) one (1) business day after (i) being
deposited in the United States Postal Service container to receive first class
mail postage prepaid, or (ii) deposited with a nationally known commercial
courier service providing next day delivery service (such as Federal Express);
in each case addressed and delivered or telecopied as follows:

                    PARTNERSHIP:
                    ----------- 

                         Boston Properties Limited Partnership
                         599 Lexington Avenue
                         New York, NY  10022
                         Attention:  Robert Selsam
                         Phone:  (212) 326-4000
                         Telecopy:  (212) 326-4041

                    with a copy to:
                         Goodwin, Proctor & Hoar, LLP
                         Exchange Place
                         Boston, MA  02109
                         Attention:  Edward M. Schulman, Esq.
                         Phone:  (617) 570-1000
                         Telecopy:  (617) 523-1231

                    and with a copy to:
                         Weil, Gotshal & Manges LLP
                         767 Fifth Avenue
                         New York, NY  10153
                         Attention:  Alan J. Pomerantz, Esq.
                         Phone:  (212) 310-8402
                         Telecopy:  (212) 310-8007

                                       57
<PAGE>
 
                    CONTRIBUTOR:
                    ----------- 

                         Kenvic Associates
                         875 Third Avenue
                         New York, NY  10022
                         Attention:  Lucille Gladstone
                         Phone:  (212) 355-0500
                         Telecopy:  (212) 486-2358

                    with a copy to:
                         Warshaw Burstein Cohen Schlesinger & Kuh, LLP
                         555 Fifth Avenue
                         New York, NY  10017
                         Attention:  Thomas J. Malmud, Esq.
                         Phone:  (212) 984-7781
                         Telecopy:  (212) 972-9150

                    with a copy to:
                         Roberts & Holland, LLP
                         Worldwide Plaza
                         825 Eighth Avenue
                         New York, NY  10019
                         Attention:  Lary Wolf, Esq.
                         Phone:  (212) 903-8719
                         Telecopy:  (212) 974-3059


      12.12  Confidentiality.  Until the Closing, the parties will consult with
             ---------------                                                   
and advise each other regarding all press releases or other public
communications of any kind relating to the transactions contemplated herein, and
the method and timing of release for publication thereof.

      12.13  Computation of Time.  Any time period provided for herein that
             -------------------                                           
shall end on a Saturday, Sunday or legal holiday shall extend to 5:00 p.m. of
the next full business day.

      12.14  Recording.  This Agreement may not be recorded without the prior
             ---------                                                       
written consent of both Partnership and Contributor.  In the event of any breach
of this covenant, the non-breaching party may, by notice, elect to terminate
this Agreement.

      12.15  Construction.  This Agreement was drafted following extensive
             ------------                                                 
negotiations between Partnership and Contributor and reflects the collaborative
efforts of both parties and their respective attorneys.  Any inconsistencies 

                                       58
<PAGE>
 
or mistakes in the drafting of this Agreement shall not be construed against
either Partnership or Contributor.

     IN WITNESS WHEREOF, each of the parties hereto has executed this Agreement,
as of the date first written above.

                            [Signature Pages follow]

                                       59
<PAGE>
 
                              CONTRIBUTOR:
                              ----------- 

                              KENVIC ASSOCIATES, A New York
                              General Partnership

                              By:
                                 -----------------------------------------------
                                 Kenneth Gladstone, General Partner of Kenvic
                                 Associates

                              By:
                                 -----------------------------------------------
                                 Lucille Gladstone, General Partner of Kenvic
                                 Associates

                              By: Gladwater Associates a New York Limited
                                  Partnership, as a General Partner of Kenvic
                                  Associates
 
                                  By:
                                     -------------------------------------------
                                     Kenneth Gladstone, General Partner of
                                     Gladwater Associates

                                  By:
                                     -------------------------------------------
                                     Lucille Gladstone, General Partner of
                                     Gladwater Associates

                              By: Vic Associates, a New York Limited
                                  Partnership, as a General Partner of Kenvic
                                  Associates

                                  By: General Chemical and Supply Co., Inc., as
                                      a General Partner of Vic Associates

                                      By:
                                         ---------------------------------------
                                         Name:
                                         Title:

                                       60
<PAGE>
 
                         PARTNERSHIP:
                         ----------- 

                         BOSTON PROPERTY LIMITED PARTNERSHIP

                         By:  Boston Properties, Inc.
                              Its General Partner


                              By:
                                 --------------------------------
                                   Name:  Mortimer Zuckerman
                                   Title: Chairman

                                       61
<PAGE>
 
The undersigned, the REIT, has executed this Agreement as of the date first
written above solely with respect to the representations, warranties and
covenants made by the undersigned set forth in Section 6 of this Agreement and
the covenants in Sections 4.2(d), 4.2(f), 6.1(f), 7.7 (introductory paragraph),
7.7(c), 7.7(h), 7.7(i), 7.7(j), 7.7(k), 7.7(p), 7.7(t), 8.3, 9.2, 9.6 and 12.12
of this Agreement.


                         REIT
                         ----

                         BOSTON PROPERTIES, INC.



                         By:
                            ------------------------------------------
                            Name:  Robert E. Selsam
                            Title: Senior Vice President

                                       62

<PAGE>
 
                                                                   EXHIBIT 10.28
 
                   LOCK-UP AND REGISTRATION RIGHTS AGREEMENT

                                  BY AND AMONG

         BOSTON PROPERTIES, INC., BOSTON PROPERTIES LIMITED PARTNERSHIP

                                      AND

                               KENVIC ASSOCIATES

                               NOVEMBER 21, 1997
<PAGE>
 
                               TABLE OF CONTENTS



1.   Certain Definitions...................................................  1
     -------------------

2.   Lock-up Agreement.....................................................  2
     -----------------

3.   Registration..........................................................  3
     ------------

4.   State Securities Laws.................................................  5
     ---------------------

5.   Expenses..............................................................  5
     --------

6.   Indemnification by the Company........................................  5
     ------------------------------

7.   Covenants of the Holder...............................................  6
     -----------------------

8.   Suspension of Registration Requirement; Restriction on Sales..........  7
     ------------------------------------------------------------

9.   Black-Out Period......................................................  8
     ----------------

10.  Additional Shares.....................................................  8
     -----------------

11.  Contribution..........................................................  8
     ------------

12.  No Other Obligation to Register.......................................  9
     -------------------------------

13.  Amendments and Waivers................................................  9
     ----------------------

14.  Notices...............................................................  9
     -------

15.  Successors and Assigns................................................ 10
     ----------------------

16.  Counterparts.......................................................... 11
     ------------

17.  Governing Law......................................................... 11
     -------------

18.  Severability.......................................................... 11
     ------------

19.  Entire Agreement...................................................... 11
     ----------------


                                       i
<PAGE>
 
                   LOCK-UP AND REGISTRATION RIGHTS AGREEMENT

      This Lock-up and Registration Rights Agreement (this "Agreement") is
                                                            ---------     
entered into as of November __, 1997 by and among Boston Properties, Inc., a
Delaware corporation (the "Company"), Boston Properties Limited Partnership, a
                           -------                                            
Delaware limited partnership (the "Partnership") and Kenvic Associates, a New
                                   -----------                               
York Partnership (the "Holder").
                       ------   

      WHEREAS, the Holder may receive shares of common stock of the Company,
$.01 par value ("Common Shares"), and has received on the date hereof units of
                 -------------
limited partnership interest ("Units") in Boston Properties Limited Partnership,
                               -----
a Delaware limited partnership (the "Partnership"), in each case issued or to be
issued without registration under the Securities Act of 1933, as amended (the
Securities Act") pursuant to that certain Contribution Agreement dated as of
- --------------
the date hereof (the "Contribution Agreement") between the Partnership and the
Holder; and

      WHEREAS, it is a condition precedent to the obligation of the Holder to
consummate the transactions under the Contribution Agreement that the Company
enter into this Agreement.

      NOW, THEREFORE, in consideration of the foregoing, the mutual promises and
agreements set forth herein, and other valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

      1.  Certain Definitions.
          ------------------- 

      As used in this Agreement, in addition to the other terms defined herein,
the following capitalized defined terms shall have the following meanings:

      "NASD" shall mean the National Association of Securities Dealers, Inc.
       ----                                                                 

      "Person" shall mean an individual, partnership, corporation, limited
       ------                                                             
liability company, trust, or unincorporated organization, or a government or
agency or political subdivision thereof.

      "Permitted Distributees" shall have the meaning set forth in Exhibit A
       ----------------------                                      ---------
hereto.

      "Registrable Shares" shall mean the Shares of the Holder, excluding (i)
       ------------------                                                    
Shares for which a Registration Statement relating to the sale thereof shall
have become effective under the Securities Act and which have been issued or
disposed of under such Registration Statement, (ii) Shares sold pursuant to Rule
144 or (iii) Shares eligible for sale pursuant to Rule 144(k) (or any successor
provision).

      "Registration Expenses" shall mean any and all expenses incident to
       ---------------------                                             
performance of or compliance with this Agreement, including, without limitation:
(i) all SEC, stock exchange or NASD registration and filing fees; (ii) all fees
and expenses incurred in connection with compliance with state securities or
"blue sky" laws (including reasonable fees and disbursements 


                                       1
<PAGE>
 
of counsel in connection with "blue sky" qualification of any of the Registrable
Shares and the preparation of a Blue Sky Memorandum) and compliance with the
rules of the NASD; (iii) all expenses of any Persons in preparing or assisting
in preparing, word processing, printing and distributing any Registration
Statement, any Prospectus, certificates and other documents relating to the
performance of and compliance with this Agreement; (iv) all fees and expenses
incurred in connection with the listing, if any, of any of the Registrable
Shares on any securities exchange or exchanges pursuant to Section 3(f) hereof;
and (v) the fees and disbursements of counsel for the Company and of the
independent public accountants of the Company, including the expenses of any
special audit or "cold comfort" letters required by or incident to such
performance and compliance. Registration Expenses shall specifically exclude
underwriting discounts and commissions relating to the sale or disposition of
Registrable Shares by the Holder, the fees and disbursements of counsel
representing the Holder in connection therewith as provided in Section 5, and
transfer taxes, if any, relating to the sale or disposition of Registrable
Shares by the Holder, all of which shall be borne by the Holder in all cases.

     "Registration Statement" shall mean any registration statement of the
      ----------------------                                              
Company which covers the issuance or resale of any of the Registrable Shares on
an appropriate form, and all amendments and supplements to such registration
statement, including post-effective amendments, in each case including the
Prospectus contained therein, all exhibits thereto and all materials
incorporated by reference therein.

     "Rule 144" means Rule 144 (or any successor provision) under the Securities
      --------                                                                  
Act.

     "SEC" shall mean the Securities and Exchange Commission.
      ---                                                    

     "Shares" shall mean any Common Shares issued or to be issuable to the
      ------                                                              
Holder upon redemption or in exchange for Units held by the Holder, which Units
were acquired by Holder pursuant to the Contribution Agreement.

      2.  Lock-up Agreement.
          ----------------- 

     (a) The Holder hereby agrees that for a period of one year after the date
hereof (the "Lock-up Period"), without the consent of the Company, it will not
             --------------                                                   
offer, pledge, sell, contract to sell, grant any options for the sale of, seek
redemption of, or otherwise dispose of, directly or indirectly (collectively
                                                                            
"Dispose of"), any Units (the "Lock-up"); provided, however, that the Holder may
- -----------                    -------    --------  -------                     
Dispose of Units pursuant to a pledge, grant of security interest or other
encumbrance effected in a bona fide transaction with an unrelated and
unaffiliated pledgee if such pledgee agrees that it will under no circumstances
foreclose with respect to such Units until after the first anniversary of the
date hereof; and provided, further, that the transferor shall, at the request of
                 --------  -------                                              
the Company, provide evidence reasonably satisfactory to the Company that the
transfer is exempt from the registration requirements of the Securities Act.  If
the Holder Disposes of Units as described in this Section 2, such Units shall
remain subject to this Agreement and, as a condition of the validity of such
disposition, the transferee shall be required 


                                       2
<PAGE>
 
to execute and deliver a counterpart of this Agreement dated as of the date
hereof (except that a pledgee shall not be required to execute and deliver a
counterpart of this Agreement until it forecloses upon such Units). Thereafter,
such transferee shall be deemed to be the Holder for purposes of this Agreement.

      (b) The Partnership hereby agrees that, in the event of a transfer of
Units to a transferee named in Exhibit A hereto (a "Permitted Distributee"), the
                               ---------
Partnership shall at the request of such Permitted Distributee admit such
Permitted Distributee to the Partnership as a Substitute Limited Partner,
provided that the Partnership shall not be obligated to admit such Permitted
Distributee as a Substitute Limited Partner unless the following conditions are
met:

          (i)    such transfer has been made in compliance with this Section 2;

          (ii)   such Permitted Distributee has executed a Limited Partner
Signature Page to the Amended and Restated Agreement of Limited Partnership of
the Partnership, in form provided by the Partnership to such Permitted
Distributee; and

          (iii)  such Permitted Distributee delivers evidence reasonably
satisfactory to the Partnership that such Permitted Distributee is an
"Accredited Investor" as defined by Regulation D under the Securities Act.

      3.  Registration.
          ------------ 

      (a) Filing of Resale Shelf Registration Statement. Subject to the
          ---------------------------------------------                
conditions set forth in this Agreement, the Company shall cause to be filed a
Registration Statement under Rule 415 under the Securities Act relating to the
sale by the Holder of all of the Registrable Shares of the Holder in accordance
with the terms hereof, and shall commence, no later than the first anniversary
of this Agreement, the preparation of such Registration Statement, and shall use
reasonable good faith efforts to cause such Registration Statement to be
declared effective by the SEC within 90 days following the first anniversary of
the date of this Agreement.  The Company agrees to use reasonable good faith
efforts to keep the Registration Statement, after its date of effectiveness,
continuously effective with respect to the Registrable Shares of the Holder
until the earlier of (a) the date on which the Holder no longer holds any
Registrable Shares or (b) the date on which all of the Registrable Shares held
by the Holder have become eligible for sale pursuant to Rule 144(k) (or any
successor provision) (hereinafter referred to as the "Resale Shelf Registration
                                                      -------------------------
Expiration Date").
- ----------------- 

      (b) Registration Statement Covering Issuance of Common Shares. In lieu of
          ---------------------------------------------------------            
the registration rights set forth in Section 3(a) above, the Company may, in its
sole discretion, prior to the first date upon which the Units held by the Holder
may be redeemed (or such other date as may be required under applicable
provisions of the Securities Act) file a registration statement (the "Issuance
                                                                      --------
Registration Statement") under Rule 415 under the Securities Act relating to the
- ----------------------                                                          
issuance to the Holder of Common Shares upon the redemption of Units or in
exchange for 


                                       3
<PAGE>
 
Units. Thereupon, the Company shall use reasonable efforts to cause such
Registration Statement to be declared effective by the SEC for all Common Shares
covered thereby. The Company agrees to use reasonable efforts to keep the
Issuance Registration Statement continuously effective, with respect to the
Registrable Shares of the Holder, until the date on which the Holder has
redeemed or exchanged the Holder's Units for Common Shares. In the event that
the Company, despite its reasonable good faith efforts, is unable to cause such
Issuance Registration Statement to be declared effective by the SEC within 90
days of the first anniversary of this Agreement or (except as otherwise
permitted by Sections 8(b) and 9) is unable to keep such Issuance Registration
Statement effective until the date on which the Holder has redeemed or exchanged
the Holder's Units for Common Shares, then the rights of the Holder set forth in
Section 3(a) above shall be restored.

     (c) Notification and Distribution of Materials. The Company shall notify
         ------------------------------------------                          
the Holder of the effectiveness of any Registration Statement applicable to the
Shares of the Holder and shall furnish to the Holder such number of copies of
the Registration Statement (including any amendments, supplements and exhibits),
the Prospectus contained therein (including each preliminary prospectus and all
related amendments and supplements) and any documents incorporated by reference
in the Registration Statement and such other documents as the Holder may
reasonably request in order to facilitate its sale of the Registrable Shares in
the manner described in the Registration Statement.

     (d) Amendments and Supplements. The Company shall prepare and file with the
         --------------------------                                             
SEC from time to time such amendments and supplements to the Registration
Statement and Prospectus used in connection therewith as may be necessary to
keep the Registration Statement effective and to comply with the provisions of
the Securities Act with respect to the disposition of all the Registrable Shares
until the earlier of (a) such time as all of the Registrable Shares have been
disposed of in accordance with the intended methods of disposition by the Holder
(in the case of a Registration Statement filed pursuant to Section 3(a) hereof)
or issued in accordance with the intended method of issuance by the Company (in
the case of a Registration Statement filed pursuant to Section 3(b) hereof) or
(b) the date on which the Registration Statement ceases to be effective in
accordance with the terms of this Section 3. Upon twenty (20) business days'
notice, the Company shall file any supplement or post-effective amendment to the
Registration Statement with respect to the plan of distribution or the Holder
ownership interests in its Registrable Shares that is reasonably necessary to
permit the sale of the Holder's Registrable Shares pursuant to the Registration
Statement. The Company shall file any necessary listing applications or
amendments to the existing applications to cause the Shares registered under any
Registration Statement to be then listed or quoted on the primary exchange or
quotation system on which the Common Shares are then listed or quoted.

     (e) Notice of Certain Events. The Company shall promptly notify the Holder
         ------------------------                                              
of, and confirm in writing, the filing of the Registration Statement or any
Prospectus, amendment or supplement related thereto or any post-effective
amendment to the Registration Statement and the effectiveness of any post-
effective amendment.



                                       4
<PAGE>
 
     At any time when a Prospectus relating to the Registration Statement is
required to be delivered under the Securities Act by the Holder to a transferee,
the Company shall immediately notify the Holder of the happening of any event as
a result of which the Prospectus included in such Registration Statement, as
then in effect, includes an untrue statement of a material fact or omits to
state any 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. In such event, the Company shall promptly prepare and furnish to
the Holder a reasonable number of copies of a supplement to or an amendment of
such Prospectus as may be necessary so that, as thereafter delivered to the
purchasers of Registrable Shares, sold under the Prospectus, such Prospectus
shall 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 are made, not
misleading. The Company will, if necessary, promptly amend the Registration
Statement of which such Prospectus is a part to reflect such amendment or
supplement.

      4.  State Securities Laws.  Subject to the conditions set forth in this
          ---------------------                                              
Agreement, the Company shall, in connection with the filing of any Registration
Statement hereunder, file such documents as may be necessary to register or
qualify the Registrable Shares under the securities or "Blue Sky" laws of such
states as the Holder may reasonably request, and the Company shall use its best
efforts to cause such filings to become effective in a timely manner; provided,
                                                                      -------- 
however, that the Company shall not be obligated to qualify as a foreign
- -------                                                                 
corporation to do business under the laws of any such state in which it is not
then qualified or to file any general consent to service of process in any such
state. Once effective, the Company shall use its best efforts to keep such
filings effective until the earlier of (a) such time as all of the Registrable
Shares have been disposed of in accordance with the intended methods of
disposition by the Holder as set forth in the Registration Statement, (b) in the
case of a particular state, the Holder has notified the Company that it no
longer requires an effective filing in such state in accordance with its
original request for filing or (c) the date on which the Registration Statement
ceases to be effective.

      5.  Expenses.  The Company shall bear all Registration Expenses incurred
          --------                                                            
in connection with the registration of the Registrable Shares pursuant to this
Agreement, except that the Holder shall be responsible for any brokerage or
underwriting commissions and taxes of any kind (including, without limitation,
transfer taxes) with respect to any disposition, sale or transfer of Registrable
Shares sold by it and for any legal, accounting and other expenses incurred by
it.

      6.  Indemnification by the Company.  The Company agrees to indemnify the
          ------------------------------                                      
Holder and its officers, directors, employees, agents, representatives and
affiliates, and each person or entity, if any, that controls the Holder within
the meaning of the Securities Act, and each other person or entity, if any,
subject to liability because of his, her or its connection with the Holder
(each, an "Indemnitee"), against any and all losses, claims, damages, actions,
           ----------                                                         
liabilities, costs and expenses (including without limitation reasonable fees,
expenses and disbursements of attorneys and other professionals), joint or
several, arising out of or based upon any violation by the 


                                       5
<PAGE>
 
Company of any rule or regulation promulgated under the Securities Act
applicable to the Company and relating to action or inaction required of the
Company in connection with any Registration Statement or Prospectus, or upon any
untrue or alleged untrue statement of material fact contained in the
Registration Statement or any Prospectus, or any omission or alleged omission to
state therein 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; provided, that the Company shall not be liable to such
                      --------  ----
Indemnitee or any person who participates as an underwriter in the offering or
sale of Registrable Shares or any other person, if any, who controls such
underwriter within the meaning of the Securities Act, in any such case to the
extent that any such loss, claim, damage, liability (or action or proceeding in
respect thereof) or expense arises out of or is based upon (i) an untrue
statement or alleged untrue statement or omission or alleged omission made in
such Registration Statement or in any such Prospectus in reliance upon and in
conformity with information regarding such Indemnitee or its plan of
distribution or ownership interests which was furnished in writing to the
Company for use in connection with the Registration Statement or the Prospectus
contained therein by such Indemnitee or (ii) the Holder's failure to send or
give a copy of the final, amended or supplemented prospectus furnished to the
Holder by the Company at or prior to the time such action is required by the
Securities Act to the selling broker for delivery to the person claiming an
untrue statement or alleged untrue statement or omission or alleged omission if
such statement or omission was corrected in such final amended or supplemented
prospectus.

      7.  Covenants of the Holder.  The Holder hereby agrees (a) to cooperate
          -----------------------                                            
with the Company and to furnish to the Company all such information concerning
its plan of distribution and ownership interests with respect to its Registrable
Shares in connection with the preparation of a Registration Statement with
respect to the Holder's Registrable Shares and any filings with any state
securities commissions as the Company may reasonably request, (b) to deliver to
the selling broker or to otherwise cause delivery of the Prospectus contained in
such Registration Statement (other than an Issuance Registration Statement) to
any purchaser of the shares covered by such Registration Statement from the
Holder and (c) to indemnify the Company, its officers, directors, employees,
agents, representatives and affiliates, and each person, if any, who controls
the Company within the meaning of the Securities Act, and each other person, if
any, subject to liability because of his connection with the Company, against
any and all losses, claims, damages, actions, liabilities, costs and expenses
arising out of or based upon (i) any untrue statement or alleged untrue
statement of material fact contained in either such Registration Statement or
the Prospectus contained therein, or any omission or alleged omission to state
therein 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, if and to the extent that such statement or omission occurs from
reliance upon and in conformity with written information regarding the Holder,
its plan of distribution or its ownership interests, which was furnished to the
Company by the Holder for use therein unless such statement or omission was
corrected in writing to the Company not less than three (3) business days prior
to the date of the final prospectus (as supplemented or amended, as the case may
be) or (ii) the failure by the Holder to deliver to the selling broker or to
otherwise cause to be delivered the Prospectus 


                                       6
<PAGE>
 
contained in such Registration Statement (as amended or supplemented, if
applicable) furnished by the Company to the Holder to any purchaser of the
shares covered by such Registration Statement from the Holder through no fault
of the Company.

      8.  Suspension of Registration Requirement; Restriction on Sales.
          ------------------------------------------------------------ 

      (a) The Company shall promptly notify the Holder of, and confirm in
writing, the issuance by the SEC of any stop order suspending the effectiveness
of a Registration Statement with respect to the Holder's Registrable Shares or
the initiation of any proceedings for that purpose. The Company shall use its
best efforts to obtain the withdrawal of any order suspending the effectiveness
of such a Registration Statement at the earliest possible moment.

      (b) Subject to Section 8(d), but notwithstanding anything else to the
contrary set forth in this Agreement, the Company's obligation under this
Agreement to cause a Registration Statement and any filings with any state
securities commission to become effective or to amend or supplement a
Registration Statement shall be suspended in the event and during such period as
unforeseen circumstances exist (including without limitation (i) an underwritten
primary offering by the Company if the Company is advised in writing by the
underwriters that the sale of Registrable Shares under the Registration
Statement would impair the pricing or commercial practicality of the primary
offering or (ii) pending negotiations relating to, or consummation of, a
transaction or the occurrence of an event that would require additional
disclosure of material information by the Company in the Registration Statement
or such filing, as to which the Company has a bona fide business purpose for
                                              ---- ----                     
preserving confidentiality or which renders the Company unable to comply with
SEC requirements) (such unforeseen circumstances being hereinafter referred to
as a "Suspension Event") that would make it impractical or unadvisable to cause
      ----------------                                                         
the Registration Statement or such filings to become effective or to amend or
supplement the Registration Statement, but such suspension shall continue only
for so long as such event or its effect is continuing. The Company shall notify
the Holder of the existence and, in the case of circumstances referred to in
clause (i) of this Section 8(b), nature of any Suspension Event.

      (c) The Holder agrees if requested in writing by the Company in the case
of a Company-initiated nonunderwritten offering or by the managing underwriter
or underwriters in a Company-initiated underwritten offering, not to effect any
public sale or distribution of any of the securities of the Company, including a
sale pursuant to Rule 144, during the 15-day period prior to, and during the 60-
day period beginning on, the date of effectiveness of the registration statement
relating to such Company-initiated offering.

      (d) Notwithstanding anything in Section 8 or Section 9 hereof to the
contrary, in the event that, after the date that is the earlier of ninety days
after the first anniversary of the date hereof or the date that the Registration
Statement is first declared effective by the SEC, the Partnership receives
notice from the Holder that the Holder seeks to redeem a number of Units that is
at least the lesser of (x) 50,000 Units or (y) the number of Units owned by the
Holder, and the Partnership determines that the Company shall issue Shares to
the Holder pursuant to such 

                                       7
<PAGE>
 
redemption, provided that such notice is not revoked in whole or in part by the
Holder prior to redemption, the Company agrees that during the 100 day period
following receipt by the Partnership of such notice of redemption, for at least
ten (10) business days (which must occur in a period or periods of not less than
five (5) consecutive business days) during such portion of such 100 day period
after which the Shares have been delivered to the Holder:

          (i)  a Registration Statement with respect to such Shares shall be
effective and not subject to suspension pursuant to this Section 8; and at the
same time

          (ii) sales by the Holder of such Shares under such Registration
Statement shall not be subject to "black-out" pursuant to Section 9 hereof.

      9.  Black-Out Period.  The Holder agrees that, following the effectiveness
          ----------------                                                      
of any Registration Statement (except an Issuance Registration Statement)
relating to Registrable Shares of the Holder, the Holder will not effect any
sales of the Registrable Shares pursuant to the Registration Statement or any
filings with any state Securities Commission at any time after the Holder has
received notice from the Company to temporarily suspend sales as a result of the
occurrence or existence of any Suspension Event so that the Company promptly may
correct or update the Registration Statement or such filing. The Holder may
recommence effecting sales of the Shares pursuant to the Registration Statement
or such filings following further notice to such effect from the Company, which
notice shall be given by the Company promptly after the conclusion of any such
Suspension Event.

      10. Additional Shares.  The Company, at its option, may register, under
          -----------------                                                  
any Registration Statement and any filings with any state securities commissions
filed pursuant to this Agreement, any number of unissued Common Shares of the
Company or any Common Shares of the Company owned by any other shareholder or
shareholders of the Company.

      11. Contribution.  If the indemnification provided for in Sections 6 and 7
          ------------                                                          
is unavailable to an indemnified party with respect to any losses, claims,
damages, actions, liabilities, costs or expenses referred to therein or is
insufficient to hold the indemnified party harmless as contemplated therein,
then the indemnifying party, in lieu of indemnifying such indemnified party,
shall contribute to the amount paid or payable by such indemnified party as a
result of such losses, claims, damages, actions, liabilities, costs or expenses
in such proportion as is appropriate to reflect the relative fault of the
Company, on the one hand, and the Indemnitee, on the other hand, in connection
with the statements or omissions which resulted in such losses, claims, damages,
actions, liabilities, costs or expenses as well as any other relevant equitable
considerations. The relative fault of the Company, on the one hand, and of the
Indemnitee, on the other hand, shall be determined by reference to, among other
factors, whether the untrue or alleged untrue statement of a material fact or
omission to state a material fact relates to information supplied by the Company
or in writing by the Indemnitee and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement or
omission; provided, however, that in no event shall the obligation of any
          --------  -------                                              
indemnifying party to 

                                       8
<PAGE>
 
contribute under this Section 11 exceed the amount that such indemnifying party
would have been obligated to pay by way of indemnification if the
indemnification provided for under Sections 6 or 7 hereof had been available
under the circumstances.

     The Company and the Holder agree that it would not be just and equitable if
contribution pursuant to this Section 11 were determined by pro rata allocation
                                                            --- ----           
or by any other method of allocation that does not take account of the equitable
considerations referred to in the immediately preceding paragraph.

     Notwithstanding the provisions of this Section 11, the Holder shall not be
required to contribute any amount in excess of the amount by which the gross
proceeds from the sale of Shares exceeds the amount of any damages that the
Holder has otherwise been required to pay by reason of such untrue or alleged
untrue statement or omission. No indemnified party guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any indemnifying party who was not guilty
of such fraudulent misrepresentation.

      12. No Other Obligation to Register.  Except as otherwise expressly
          -------------------------------                                
provided in this Agreement, the Company shall have no obligation to the Holder
to register the Registrable Shares under the Securities Act.

      13. Amendments and Waivers.  The provisions of this Agreement may not be
          ----------------------                                              
amended, modified, or supplemented or waived without the prior written consent
of the Company and the Holder.

      14. Notices.  Except as set forth below, all notices and other
          -------                                                   
communications provided for or permitted hereunder shall be in writing and shall
be deemed to have been duly given when and if delivered personally or sent by
telex or telecopier (with respect to notice by telex or telecopier, on a
business day between the hours of 8:00 a.m. and 5:00 p.m., New York time), five
business days after being sent if mailed by registered or certified mail (return
receipt requested), postage prepaid, or upon receipt if sent by courier or
overnight delivery service to the respective parties at the following addresses
(or at such other address for any party as shall be specified by like notice,
provided that notices of a change of address shall be effective only upon
receipt thereof), and further provided that in case of directions to amend the
Registration Statement pursuant to Section 3(f) or Section 7, the Holder must
confirm such notice in writing by overnight express delivery with confirmation
of receipt:

          If to the Company:  Boston Properties, Inc.
                              8 Arlington Street
                              Boston, MA 02116
                              Attn: Edward H. Linde, President
                              Telecopy: (617) 536-4233

                                       9
<PAGE>
 
          with a copy to:     Goodwin, Procter & Hoar LLP
                              Exchange Place
                              Boston, MA 02109
                              Attn: Gilbert G. Menna, P.C.
                              Telecopy: (617) 523-1231

          and with a copy to:

                              Weil, Gotshal & Manges LLP
                              767 Fifth Avenue
                              New York, NY  10153
                              Attention: Alan J. Pomerantz, Esq.
                              Phone: 212-310-8402
                              Telecopy: 212-310-8007

          If to the Holder:   As listed on the Holder Signature Page

          with a copy to:     Warshaw Burstein Cohen Schlesinger & Kuh, LLP
                              555 Fifth Avenue
                              New York, NY  10017
                              Attention: Thomas J. Malmud, Esq.
                              Phone: 212-984-7781
                              Telecopy: 212-972-9150

          and a copy to:      Roberts & Holland, LLP
                              Worldwide Plaza
                              825 Eighth Avenue           
                              New York, NY 10019          
                              Attention: Lary S. Wolf, Esq.
                              Phone: 212-903-8719         
                              Telecopy: 212-974-3059       

In addition to the manner of notice permitted above, notices given pursuant to
Sections 3, 8 and 9 hereof may be effected telephonically if promptly confirmed
in writing thereafter in the manner described above.

      15. Successors and Assigns.  This Agreement shall be binding upon the
          ----------------------                                           
parties hereto and their respective successors and assigns and shall inure to
the benefit of the parties hereto and their respective successors and assigns.
This Agreement may not be assigned by the Holder and any attempted assignment
hereof by the Holder will be void and of no effect and the Holder shall
indemnify the Company and the Partnership against any and all losses, claims,
damages, actions, liabilities, costs and expenses (including without limitation
reasonable fees, expenses and 

                                       10
<PAGE>
 
disbursements of attorneys and other professionals), arising out of or based
upon such attempted assignment; provided, that, the Holder may assign its rights
                                --------  ----
hereunder to any person to whom the Holder may Dispose of Shares and/or Units
pursuant to Section 2(b) hereof.

      16. Counterparts.  This Agreement 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.

      17. Governing Law.  This Agreement shall be governed by and construed in
          -------------                                                       
accordance with the laws of the State of Delaware applicable to contracts made
and to be performed wholly within said State.

      18. Severability.  In the event that any one or more of the provisions
          ------------                                                      
contained herein, or the application thereof in any circumstances, is held
invalid, illegal or unenforceable in any respect for any reason, the validity,
legality and enforceability of any such provision in every other respect and of
the remaining provisions contained herein shall not be in any way impaired
thereby, it being intended that all of the rights and privileges of the parties
hereto shall be enforceable to the fullest extent permitted by law.

      19. Entire Agreement.  This Agreement is intended by the parties as a
          ----------------                                                 
final expression of their agreement and intended to be the complete and
exclusive statement of the agreement and understanding of the parties hereto in
respect of the subject matter contained herein.  There are no restrictions,
promises, warrants or undertakings, other than those set forth or referred to
herein, with respect to such subject matter.  This Agreement supersedes all
prior agreements and understandings between the parties with respect to such
subject matter.

                                       11
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first written above.



                                    BOSTON PROPERTIES, INC.



                                    By:
                                       -----------------------------------------
                                         Name: Robert E. Selsam
                                         Title: Senior Vice President

                                    BOSTON PROPERTIES LIMITED PARTNERSHIP

                                    By:  Boston Properties, Inc.
                                         Its General Partner


                                    By:
                                       -----------------------------------------
                                         Name: Robert E. Selsam
                                         Title: Senior Vice President

                                       12
<PAGE>
 
                                    KENVIC ASSOCIATES, A New York General 
                                    Partnership


                                    By: 
                                       -----------------------------------------
                                         Lucille Gladstone,
                                         General Partner of Kenvic Associates

                                    By:  Gladwater Associates, a New York 
                                         Limited Partnership, as a General 
                                         Partner of Kenvic Associates
 

                                    By:
                                       -----------------------------------------
                                         Lucille Gladstone,
                                         General Partner of Gladwater Associates

                                         By:   Vic Associates, a New York   
                                               Limited Partnership, as a General
                                               Partner of Kenvic Associates

                                         By:   General Chemical and Supply Co., 
                                               Inc., as a General Partner of Vic
                                               Associates

                                          By:
                                             -----------------------------------
                                               Name: Edwin H. Baker
                                               Title: President

                                          Kenvic Associates
                                          c/o Madison Equities
                                          875 Third Avenue
                                          New York, New York  10022
                                          Attention: ___________
                                          Telephone number
                                          Facsimile number

                                       13

<PAGE>
 
                                                                   Exhibit 10.29

                               November 21, 1997



Kenvic Associates
c/o Madison Equities
875 Third Avenue
New York, New York  10022
Attention:

Gentlemen:

     Reference is made to the Contribution Agreement dated as of September 2,
1997 (the "Agreement") by and between Kenvic Associates, a New York partnership
("Contributor"), and Boston Properties Limited Partnership, a Delaware limited
partnership ("Partnership"). Capitalized terms used herein and not otherwise
defined shall have the meanings ascribed to such terms in the Agreement or the
Partnership Agreement.

     Contributor agrees, as required by Section 12.2 of the Partnership
Agreement in order to become an Additional Limited Partner of the Partnership,
to be bound by all of the terms and conditions of the Partnership Agreement,
including without limitation, the power of attorney granted to certain Persons
as set forth in Section 2.4 thereof, and with respect to the redemption rights
set forth in Section 8.6 thereof, provided that, notwithstanding anything to the
contrary set forth in Section 8.6 thereof, Contributor shall not have the right
to exercise its redemption rights set forth in such Section until the date which
is one (1) year following the Closing Date.

     If as of December 31, 1998, the average daily closing price as reported by
the New York Stock Exchange of the common stock of the REIT (the "REIT Shares")
for the ten (10) consecutive preceding trading days including December 31, 1998
is less than $31.43 per share (such average amount, the "Share Average"),
promptly following such date, Partnership shall transfer to Contributor the
number of additional Units equal to (i) the amount of the difference between
$31.43 and the Share Average multiplied by 890,869, divided by (ii) the Share
Average.

     The Contributor and Partnership further agree that notwithstanding anything
to the contrary in the Partnership Agreement:
<PAGE>
 
Kenvic Associates
___________, 1997
Page 2

     (i)    During the 10 year period following the Closing, Partnership may not
directly or indirectly sell or otherwise dispose of or transfer or permit the
direct or indirect sale, transfer or disposition of the Property or a Successor
Designated Property (as hereinafter defined) in a transaction that causes gain
recognition under any section of the Code for Contributor without the consent of
Contributor; it being agreed that for purposes of this Section, the term
"Successor Designated Property" means a property acquired by Partnership upon
the disposition of the Property in a Section 1031 like kind exchange or any
other exchange transaction that does not result in gain recognition; provided,
                                                                     -------- 
however, the provisions of this Section shall not be applicable if at any time
- -------                                                                       
Contributor, together with its Permitted Distributees (as such term shall
hereinafter be defined) beneficially owns fewer than 35% of the number of Units
owned by Contributor following the Closing.

     (ii)   Contributor, the Partnership and REIT will reflect and report, on
all tax forms or tax returns to be filed with any Federal, State, or local
governmental agency or taxing authority, the transactions contemplated and
evidenced by the Contribution Agreement in a manner that to the greatest extent
possible is consistent with the form of the transactions as evidenced by the
Contribution Agreement and the terminology used in the Contribution Agreement.

     (iii)  As long as Contributor (including, for this purpose, the Permitted
Distributees) retains any Units, Partnership shall utilize the traditional
method of allocating gain and depreciation under Section 704(c) of the Code with
respect to the Property, with curative allocations limited to gain upon sale of
the Property to the extent allocations of depreciation deductions with respect
to the Property to other Unit holders have been limited by the so-called
"ceiling rule", as described in Regulations Section 1.704-3(c)(iii)(B).

     (iv)   In the event and to the extent that Partnership reduces the amount
of non-recourse debt secured by the Property from $180,000,000 to not less than
$130,000,000, Partnership agrees to permit Contributor and the Permitted
Distributees (each such party, the "Affected Party") to (a) restore deficits in
each of their capital accounts in an amount to be determined by the Affected
Party, which amounts the Affected Party shall be permitted to reduce at any time
except to the extent that the Affected Party's capital account is negative at
such time, and on the same tier of risk of loss as is provided to the other Unit
holders and/or (b) guarantee debt of Partnership not secured by the Property and
not guaranteed at that time by any other partner of Partnership and to become
the guarantor or guarantors of last resort with respect to any such debt
reasonably satisfactory to the Affected Party, the form and content of which
guaranty shall also be reasonably satisfactory to the Affected Party, provided
however that the sum of the amounts provided for under clauses (a) and (b) of
this 
<PAGE>
 
Kenvic Associates
___________, 1997
Page 3

subparagraph (iv) shall not exceed 50% of the amount of such reduction in non-
recourse debt secured by the Property. In the event and to the extent that the
Partnership reduces the amount of non-recourse debt secured by the Property to
below $130,000,000 (other than as a result of normal amortization of the debt as
currently provided in the Hancock Mortgage), Partnership agrees to permit each
Affected Party to (x) restore deficits in its capital account in an amount to be
determined by the Affected Party which amounts the Affected Party shall be
permitted to reduce at any time except to the extent that the Affected Party's
capital account is negative at such time, and on the same tier of risk of loss
as is provided to the other Unit holders and/or (y) guarantee debt of
Partnership not secured by the Property (except as otherwise provided in the
following sentence) and not guaranteed at that time by any other partner of
Partnership and to become the guarantor or guarantors of last resort with
respect to any such debt reasonably satisfactory to the Affected Party, the form
and content of which guaranty shall be reasonably satisfactory to the Affected
Party. For purposes of clause (y) of this subparagraph (iv), during the period
from September 4, 2002 until the expiration of this clause (iv) as provided
below, if there is debt secured by the Property at any time during such period,
the Partnership shall permit the Affected Party to guarantee such debt in an
amount equal to the lesser of $100,000,000 or the entire amount of such debt,
which debt shall be acceptable to the Affected Party. The parties agree that the
sum of the amounts provided for under clauses (a), (b), (x) and (y) of this
subparagraph (iv) shall not exceed the lesser of (aa) $130,000,000 less the
aggregate amount of debt allocable to all Affected Parties under Code Section
752 with respect to the debt secured by the Property or (bb) the sum of 50% of
the amount of such reduction in non-recourse debt secured by the Property from
$180,000,000 to not less than $130,000,000 and 100% of such reduction below
$130,000,000.

     Failure by the Affected Party to notify the Partnership that the Affected
Party objects to certain offered debt or guaranty pursuant to this subparagraph
(iv) within thirty (30) days after receiving notice from Partnership containing
details of such offered debt, and which notice is accompanied by a copy of the
proposed guaranty, shall mean that such offered debt and the form and content of
such offered guaranty are acceptable to the Affected Party for purposes of this
subparagraph (iv).

     Partnership shall not permit any partner (other than Contributor or the
Permitted Distributees as provided in this subparagraph (iv)) to guarantee any
non-recourse debt secured by the Property.  This subparagraph (iv) shall be
deemed to expire on the earlier of the tenth anniversary of the date hereof or
the date on which Contributor, together with its Permitted Distributees
beneficially owns fewer than 35% of the number of Units owned by Contributor
following the Closing.
<PAGE>
 
Kenvic Associates
___________, 1997
Page 4

     (v) Partnership shall reasonably prior thereto endeavor to keep Contributor
advised of any discussion with Hancock involving modifications of the Hancock
Mortgage, or refinancing or payment of the Hancock Mortgage before maturity and
when deemed reasonable and appropriate by Partnership in its sole discretion,
exercised in good faith, include Contributor in any such formal discussions.

     As used herein, the term "Permitted Distributees" shall mean those persons
described in Exhibit A to that certain Lock-Up and Registration Rights Agreement
             ---------
by and among Contributor, the Partnership and the REIT, dated as of the date
hereof.  Any communications required or permitted under this letter may be given
to the Permitted Distributees at their respective addresses shown on the books
and records of the Partnership.

     This letter agreement, together with the Agreement, constitutes the entire
agreement among the parties hereto and thereto covering the subject matter
hereof and thereof.  This letter agreement may not be amended or terminated
except in a writing signed by each party hereto; may be executed in multiple
counterparts, each of which shall be an original and all of which taken together
shall constitute one and the same agreement; shall be binding on each party
hereto, each Permitted Distributee and any permitted assignee of such party;
shall not be assignable by any party hereto without the prior written consent of
the other party (except to a Permitted Distributee); and shall be governed by
and construed in accordance with the laws of the State of New York (without
giving effect to any conflict of laws provision thereof).  Any Permitted
Distributee shall only be considered an "Affected Party" pursuant to this letter
upon execution and delivery of a counterpart of this letter by such Permitted
Distributee.
<PAGE>
 
Kenvic Associates
___________, 1997
Page 5

     Kindly confirm your agreement with the foregoing by signing and returning
the enclosed copy of this letter.

                                BOSTON PROPERTY LIMITED PARTNERSHIP

                                By: Boston Properties, Inc., Its General Partner


                                    By:
                                        ----------------------------------------
                                        Name:
                                        Title:


                                Agreed and Accepted

                                KENVIC ASSOCIATES, A New York General 
                                Partnership


                                By:
                                    --------------------------------------------
                                    Kenneth Gladstone, General Partner of 
                                    Kenvic Associates


                                By:
                                    --------------------------------------------
                                    Lucille Gladstone, General Partner of Kenvic
                                    Associates

                                By: Gladwater Associates a New York Limited
                                    Partnership, as a General Partner of Kenvic 
                                    Associates


                                    By:
                                        ----------------------------------------
                                        Kenneth Gladstone, General Partner of 
                                        Gladwater Associates

              
                                    By:
                                        ----------------------------------------
                                        Lucille Gladstone, 
                                        General Partner of Gladwater Associates
                                    

                                By: Vic Associates, a New York Limited 
                                    Partnership, as a General Partner of Kenvic
                                    Associates

                                    By: General Chemical and Supply Co., Inc., 
                                        as a General Partner of Vic Associates


                                    By:
                                        ----------------------------------------
                                        Name:
                                        Title:
<PAGE>
 
Kenvic Associates
___________, 1997
Page 6

                                     By:
                                          ------------------------------------
                                          Lucille Gladstone, General Partner of 
                                          Gladwater Associates

                                 By: Vic Associates, a New York Limited
                                     Partnership, as a General Partner of Kenvic
                                     Associates
                                
                                 By: General Chemical and Supply Co., Inc., as a
                                     General Partner of Vic Associates


                                     By:
                                          ------------------------------------
                                          Name:
                                          Title:

<PAGE>
 
                                                                   Exhibit 10.30





              NOTE AND MORTGAGE MODIFICATION AND SPREADER AGREEMENT



                   NOTE AND MORTGAGE MODIFICATION AND SPREADER AGREEMENT
         (this "Agreement"), dated as of November __, 1997, between BOS-
                ---------
         TON PROPERTIES LIMITED PARTNERSHIP ("Mortgagor"), a Delaware
                                              ---------
         limited partnership, having an address at 599 Lexington Avenue,
         New York, New York 10022, and JOHN HANCOCK MUTUAL LIFE INSUR-
         ANCE COMPANY ("Mortgagee"), a Massachusetts corporation, having
                        ---------
         its principal office at John Hancock Place, Post Office Box
         111, Boston, Massachusetts 02117, Attention:  Real Estate In-
         vestment Group, T-52.


                                   WITNESSETH:

                   WHEREAS, Mortgagor (a) is, on the date of delivery
         hereof, the owner of fee title to a parcel of land and the im-
         provements thereon known as 875 Third Avenue, New York, New
         York and the easements appurtenant thereto (collectively, the
         "Original Fee Parcel"), all as more particularly described in
          -------------------
         Exhibit A-1 hereto, and (b) shall, prior to the recording of
         -----------
         this Agreement (as more fully described below), be the owner of
         fee title to the Corner Parcel and all Improvements thereon (as
         such terms are defined in the Mortgage, as hereinafter de-
         fined), which Corner Parcel is contiguous to the Original Fee
         Parcel and is more particularly described on Exhibit A-2 hereto
         (the Original Fee Parcel and the Corner Parcel as collectively
         described on Exhibit A-3 hereto are herein collectively re-
                      -----------
         ferred to as the "Premises");
                           --------

                   WHEREAS, Mortgagee is on the date hereof the owner
         and holder of the mortgages described in Exhibit B hereto,
                                                  ---------
         which mortgages were consolidated, extended and modified pursu-
         ant to that certain Consolidation, Extension and Modification
         Agreement (the "Consolidation Agreement"), dated as of May 11,
                         -----------------------
         1988, between Kenvic Associates, a New York general partnership
         ("Original Mortgagor") and Mortgagee, recorded on May 18, 1988
           ------------------
         in the Office of the City Register, New York County (the
         "Register's Office") in Reel 1403, Page 1793, so as to form a
          -----------------
         single first lien on the Mortgaged Premises (as such term is
         hereinafter defined) in the original principal amount of
         $180,000,000, and were further modified (i) pursuant to that
         certain Modification Agreement, dated as of May 30, 1990, be-
         tween Original Mortgagor and Mortgagee, recorded on June 28,
         1990 in the Register's Office in Reel 1705, Page 1760 (the
         "1990 Modification Agreement"), (ii) pursuant to that certain
          ---------------------------
         Note and Mortgage Modification Agreement, dated as of July 23,
         1992, between Original Mortgagor and Mortgagee, recorded on
<PAGE>
 
         July 30, 1992 in the Register's Office in Reel 1892, Page 434
         (the "1992 Modification Agreement"), and (iii) pursuant to that
               ---------------------------
         certain Note and Mortgage Modification and Spreader Agreement,
         dated as of December 29, 1995, between Original Mortgagor and
         Mortgagee, recorded on January 5, 1996 in the Register's Office
         in Reel 2279, Page 443 (the "1995 Modification Agreement");
                                      ---------------------------

                   WHEREAS, the Mortgage (as such term is hereinafter
         defined) secures, among other things, the payment of the prin-
         cipal of and premium, if any, and interest on the Notes (as
         such term is hereinafter defined) in accordance with the terms
         of the Notes and the Mortgage;

                   WHEREAS, as of the date hereof, (i) Original Mort-
         gagor has, in exercise of its rights under Section 6 of the
         1995 Modification Agreement, conveyed to Mortgagor all of
         Original Mortgagor's right, title and interest in and to the
         Original Fee Parcel, (ii) Mortgagee and Original Mortgagor have
         terminated the Corner Parcel Lease pursuant to that certain
         Termination of Lease, dated as of the date hereof, (iii) Mort-
         gagee has conveyed to Mortgagor Mortgagee's fee title in and to
         the Corner Parcel, and (iv) Mortgagor has agreed to assume all
         of Original Mortgagor's obligations under the Notes, the Mort-
         gage and the other Loan Documents pursuant to the Assumption
         (as such terms are hereinafter defined), including, without
         limitation, the obligations of Original Mortgagor to make pay-
         ments of principal and interest under and pursuant to the Notes
         (the transactions described in subparagraphs (i), (ii), (iii)
         and (iv) above shall hereinafter be collectively referred to as
         the "Transfer"; all documents and instruments evidencing, cre-
              --------
         ating or otherwise relating to or executed in connection with
         the Transfer shall hereinafter be collectively referred to as
         the "Transfer Documents");
              ------------------

                   WHEREAS, Mortgagor and Mortgagee desire to spread the
         lien of the Mortgage to cover all of the Premises, including,
         without limitation, both the Original Fee Parcel and Mort-
         gagor's fee title to the Corner Parcel (including the Improve-
         ments thereon); and

                   WHEREAS, Mortgagor and Mortgagee desire to further
         modify certain terms and conditions of the Mortgage in the man-
         ner set forth herein.

                   NOW, THEREFORE, for good and valuable consideration,
         the receipt and sufficiency of which are hereby acknowledged,
         Mortgagor and Mortgagee hereby agree as follows:

                                      -2-
<PAGE>
 
                   1.  Definitions.
                       -----------

                   (a)  Any capitalized term used in this Agreement and
         not defined herein shall have the respective meaning assigned
         to such term in the Notes or in the Mortgage.  Each term de-
         fined below, when used in this Agreement, in the Mortgage, the
         Notes or in any of the other Loan Documents, shall have its
         respective meaning set forth below.

                   (b)  The term "1995 Amendment" shall mean the Amend-
                                  --------------
         ment Agreement, dated as of December 29, 1995, between Original
         Mortgagor and Mortgagee, and recorded in the Register's Office
         at Reel 2279, Page 516.

                   (c)  The term "Assignment of Leases" shall mean the
                                  --------------------
         Assignment of Leases, dated as of May 11, 1988, between Origi-
         nal Mortgagor and Mortgagee, recorded in the Register's Office
         on May 18, 1988 in Reel 1403, Page 1899, as amended by the 1995
         Amendment, and as further amended by that certain Amendment
         Agreement (the "1997 Amendment"), dated as of the date hereof,
                         --------------
         between Mortgagor and Mortgagee, and intended to be recorded in
         the Register's Office following the execution thereof, as may
         be further amended, modified or supplemented from time to time.

                   (d)  The term "Assignment of Rents" shall mean the
                                  -------------------
         Assignment of Rents, dated as of May 11, 1988, between Original
         Mortgagor and Mortgagee, recorded in the Register's Office on
         May 18, 1988 in Reel 1403, Page 1886, as amended by the 1995
         Amendment, and as amended further by the 1997 Amendment, as may
         be further amended, modified or supplemented from time to time.

                   (e)  The term "Assumption" shall mean the Assumption,
                                  ----------
         dated as of the date hereof, by Mortgagor for the benefit of
         Mortgagee and Original Mortgagor and their respective succes-
         sors and assigns.

                   (f)  The term "Consent" shall mean the Consent, dated
                                  -------
         as of the date hereof, by Mortgagee for the benefit of Original
         Mortgagor and Mortgagor and their respective successors and
         assigns.

                   (g)  The term "Controlling Party" shall mean the
                                  -----------------
         Mortgagor General Partner and any other Person or Persons,
         whether directly or indirectly, exercising control over the
         business, management or operations of, or having the right to
         make, direct or veto significant business decisions for, Mort-
         gagor, including (without limitation) through ownership or ac-
         quisition of equity interests or other beneficial interests in

                                      -3-
<PAGE>
 
         Mortgagor, through the exercise of rights contained in the Gov-
         erning Documents of Mortgagor, through the amendment or mod-
         ification of the Governing Documents of Mortgagor, or otherwise
         by contract or agreement, provided that a Person shall not be
                                   --------
         deemed to be a Controlling Party solely by virtue of its acting
         as manager or managing agent of the Mortgaged Premises.

                   (h)  The term "Corner Parcel Indemnity" shall mean
                                  -----------------------
         the Indemnification Agreement, dated as of the date hereof,
         between Mortgagor and Mortgagee, as amended, modified or
         supplemented from time to time, which agreement has been at-
         tached hereto as Exhibit C and shall be deemed to be incorpo-
                          ---------
         rated in, and made a part of, the Mortgage.

                   (i)  The term "Environmental Indemnity" shall mean
                                  -----------------------
         the Environmental Indemnity and Agreement, dated as of the date
         hereof, between Mortgagor and Mortgagee, as amended, modified
         or supplemented from time to time, which agreement has been
         attached hereto as Exhibit D and shall be deemed to be incorpo-
                            ---------
         rated in, and made a part of, the Mortgage.

                   (j)  The term "Loan Documents" shall mean, collec-
                                  --------------
         tively, the Notes, the Consolidation Agreement, the Mortgage,
         the 1990 Modification Agreement, the 1992 Modification Agree-
         ment, the 1995 Modification Agreement, this Agreement, the Cash
         Collateral Agreement, the Environmental Indemnity, the Corner
         Parcel Indemnity, the Assignment of Rents, the Assignment of
         Leases, the Tax Processing Agreement, and any other documents,
         instruments or agreements entered into pursuant to any such
         documents, or in connection therewith.

                   (k)  The term "Mortgagor General Partner" shall mean
                                  -------------------------
         Boston Properties, Inc., a Delaware corporation.

                   (l)  The term "1997 Modification Documents" shall
                                  ---------------------------
         mean, collectively, this Agreement, the 1997 Amendment, the
         Environmental Indemnity, the Corner Parcel Indemnity, the As-
         sumption, the Consent, the Release, the Transfer Documents and
         all other documents, instruments or agreements entered into
         pursuant thereto or in connection therewith.

                   (m)  The term "Release" shall mean the Mutual Waiver
                                  -------
         and Release Agreement, dated as of the date hereof, between
         Mortgagee and Original Mortgagor, as amended, modified, or
         supplemented from time to time.

                   (n)  The term "Tax Processing Agreement" shall mean
                                  ------------------------
         the Tax Processing Agreement, dated as of May 10, 1988, between

                                      -4-
<PAGE>
 
         Original Mortgagor and Mortgagee, as amended by the 1995 Amend-
         ment and 1997 Amendment, and as may be further amended, modi-
         fied or supplemented from time to time.

                   (o)  The term "Title Commitment" shall mean the Com-
                                  ----------------
         mitment for Title Insurance (Title No. TS-109932) relating to
         the Mortgaged Premises, dated as of July 1, 1997, issued by
         TitleServ Agency of New York City, Inc., as may be amended,
         modified and supplemented from time to time.

                   2.  Acknowledgment by Mortgagor.  Mortgagor acknowl-
                       ---------------------------
         edges and confirms that the Transfer was effected subject to
         the lien and security interest of the Mortgage, the Assignment
         of Rents, the Assignment of Leases, the Tax Processing Agree-
         ment, the Cash Collateral Agreement and the other Loan Docu-
         ments, and that Mortgagor pursuant to the Assumption has as-
         sumed the obligations of Original Mortgagor under the Notes,
         the Mortgage, the Assignment of Rents, the Assignment of
         Leases, the Tax Processing Agreement, the Cash Collateral
         Agreement, and the other Loan Documents.  From and after the
         date hereof, the term "Mortgagor", "Assignor", "Obligor",
         "Maker" or such other term as used in the Mortgage, the Notes,
         the Assignment of Rents, the Assignment of Leases, the Tax Pro-
         cessing Agreement, the Cash Collateral Agreement, and the other
         Loan Documents shall mean Boston Properties Limited Partnership
         and its permitted successors and/or assigns.

                   3.  Mortgage to Be Spread.
                       ---------------------

                   (a)  The term "Land", as defined and used in the
                                  ----
         Mortgage, shall be amended to include (without limitation) the
         Corner Parcel described on Exhibit A-2 hereto.
                                    -----------

                   (b)  The term "Mortgaged Premises", as defined and
                                  ------------------
         used in the Mortgage, shall be amended to include, without lim-
         itation, Mortgagor's fee interest in the Corner Parcel, includ-
         ing (without limitation) the Improvements thereon and the Space
         Leases applicable to the Corner Parcel and the Improvements
         thereon.

                   (c)  The Mortgage and the lien thereof is hereby
         spread to cover Mortgagor's fee interest in the Corner Parcel,
         including (without limitation) Mortgagor's right, title and
         interest in and to the Improvements thereon and the Space
         Leases applicable to the Corner Parcel and the Improvements
         thereon.

                   (d)  Section 5.01(f) is hereby deleted from the Mort-
         gage in its entirety.

                                      -5-
<PAGE>
 
                   (e)  Section 4(e) of the 1995 Modification Agreement
         is hereby deleted in its entirety.

                   4.  Sales, Transfers, etc.  Section 5.01(n) of the
                       ---------------------
         Mortgage is hereby amended and restated, in its entirety, as
         follows:

                        "(n) if Mortgagor or any of its successors or
              permitted assigns shall, voluntarily or by operation of
              law, directly or indirectly (including, without limita-
              tion, by merger, consolidation or transfer, conveyance or
              other disposition of over 49% of the ownership interests
              in Mortgagor or by merger, consolidation or transfer, con-
              veyance or other disposition of over 49% of the ownership
              interests of any Controlling Party), sell, assign, trans-
              fer, convey or otherwise dispose of all or any part of the
              Mortgaged Premises, unless (i) at least 30 days prior to
                                          -
              such sale, transfer, conveyance or disposition, Mortgagor
              shall notify Mortgagee of such transaction, (ii) Mortgagee
                                                           --
              shall consent thereto in writing, which consent may be
              withheld by Mortgagee in its sole and absolute discretion,
              (iii) subject to the provisions of Section 5.02 hereof,
               ---
              the Mortgagor executing this Mortgage shall remain
              primarily liable for the indebtedness secured hereby and
              the performance of all the terms, covenants and conditions
              of this Mortgage, (iv) Mortgagee is furnished by Mortgagor
                                 --
              with true, correct and complete copies of the documenta-
              tion effecting such transfer or encumbrance within 5 days
              after such transaction, and (v) the transferee(s) exe-
                                           -
              cute(s) this Mortgage as a security agreement and such
              financing statements and other documents, certificates and
              instruments as may be required by Mortgagee, so that Mort-
              gagee will have a valid and perfected security interest in
              all personal property acquired by any successors and
              assigns of Mortgagor for use in or upon such conveyed
              property and delivers all such documents, certificates and
              instruments to Mortgagee within 5 days after such sale,
              conveyance, transfer or disposition.  Notwithstanding the
              foregoing, to the extent equity interests in Mortgagor or
              any Controlling Party are (i) freely traded on a
              nationally recognized public market or exchange (a "Public
                                                                  ------
              Market"), and (ii) have been registered for sale with the
              ------
              Securities and Exchange Commission and are otherwise
              subject to filing and registration requirements under the
              Securities Exchange Act of 1934, as amended, the buying
              and selling of such equity interests on such Public Market
              in the ordinary course shall not require Mortgagee's
              consent hereunder, provided that any such transaction
              shall not result in a change (directly or indirectly) of
              the Person or Persons exercising control over

                                      -6-
<PAGE>
 
              the business, management or operations of, or having the
              right to make, direct or veto significant business deci-
              sions for, Mortgagor or such Controlling Party."

                   5.  Exercise of One Time Assumption.  Original Mort-
                       -------------------------------
         gagor has exercised its rights under Section 6 of the 1995 Mod-
         ification Agreement to "Transfer" (as such term is defined
         therein) all of the Mortgaged Premises to Mortgagor, and as
         such rights of "Transfer" under said section were limited to a
         one time occurrence, said Section 6 of the 1995 Modification
         Agreement is hereby deleted in its entirety.

                   6.  Liability of Mortgagor.
                       ----------------------

                   (a)  In any action brought at law or in equity to
         enforce the obligations of Mortgagor to pay any indebtedness or
         to perform any other monetary obligation or any non-monetary
         obligation created or arising under the Consolidation Agree-
         ment, the Mortgage, the Notes, the Assignment of Leases, the
         Assignment of Rents, the Cash Collateral Agreement, or under
         any of the other Loan Documents, the judgment or decree shall
         be enforceable against Mortgagor only to the extent of its in-
         terest in the Mortgaged Premises (or the property subject to
         such other instrument or agreement described above), and Mort-
         gagee shall not seek or claim recourse against any other assets
         of Mortgagor or against any party holding partnership interests
         or other ownership interests, equitable interests or other ben-
         eficial interests, whether direct or indirect, in Mortgagor
         (each, a "Constituent Party" and collectively, "Constituent
                   -----------------                     ----------- 
         Parties"), or any principal, member, officer, director, share-
         -------
         holder or equity owner of any such Constituent Party and any
         such judgment shall not be subject to execution on, nor be a
         lien on, assets of Mortgagor (or of its Constituent Parties or
         any principal, member, officer, director, shareholder or other
         equity owners of its Constituent Parties) other than the Mort-
         gaged Premises (or the property subject to such other instru-
         ment or agreement described above), provided that the foregoing
                                             --------
         shall not relieve Mortgagor or any other Controlling Party of
         any liability for, nor prejudice or limit the rights of Mort-
         gagee by reason of, any of the following, to the extent of any
         damage arising directly or indirectly to Mortgagee:

                   (i)   fraud or misrepresentation of Mortgagor, and
                         physical waste of the Mortgaged Premises aris-
                         ing from the gross negligence or wilful miscon-
                         duct of Mortgagor;

                   (ii)  any rents, issues or profits collected more
                         than one (1) month in advance of their due
                         dates;

                                      -7-
<PAGE>
 
                   (iii) any Misapplication (as hereinafter defined) of
                         loan proceeds, rents, issues or profits, secu-
                         rity deposits, any other payments from tenants
                         or occupants (including without limitation,
                         lease termination fees), insurance proceeds or
                         condemnation awards;

                   (iv)  liability under the Environmental Indemnity or
                         the environmental covenants, environmental con-
                         ditions and environmental indemnifications con-
                         tained in the Mortgage; 

                   (v)   liability under the Corner Parcel Indemnity;

                   (vi)  personalty or fixtures which Mortgagor, di-
                         rectly or through an agent, removed from the
                         Mortgaged Premises and which were not replaced
                         by items of equal or greater utility than the
                         personalty or fixtures so removed, unless such
                         personalty or fixtures so removed are unneces-
                         sary to properly operate the Mortgaged Premises
                         or are obsolete, provided that, for purposes of
                         this subparagraph (vi), neither a receiver for
                         the Mortgaged Premises appointed solely by or
                         at the request of Mortgagee, an agent appointed
                         solely by Mortgagee, nor the Mortgagee acting
                         as mortgagee-in-possession, shall be deemed to
                         be an agent of Mortgagor;

                   (vii) any amount equal to the sum of all payments
                         made by Mortgagor to holders of subordinate
                         mortgages (not consented to in writing by Mort-
                         gagee) on the Mortgaged Premises during any pe-
                         riod in which Mortgagor is in default of pay-
                         ment of principal or interest under the Notes
                         or of any escrow payments required under the
                         Mortgage in respect of real property taxes or
                         assessments; or

                  (viii) reasonable attorney's fees, court costs and
                         other expenses incurred by Mortgagee in connec-
                         tion with the successful enforcement of Mort-
                         gagor's personal liability as set forth herein.

                   (b)  As used in this Section 6, the term "Misapplica-
         tion" shall mean (1) the distribution or payment of cash flow
         by Mortgagor to, or for the benefit of, any holder of a mort-
         gage on the Mortgaged Premises subordinate to the Mortgage,
         which mortgage has not been consented to in writing by Mort-
         gagee (a "Distribution"), at such time as Mortgagor has failed
                   ------------

                                      -8-
<PAGE>
 
         to pay or caused to be paid any of the following:  (A) the
         principal and interest then due under the Notes and Mortgage,
         (B) any other amounts then due under the Notes, the Mortgage,
         the Cash Collateral Agreement, or any other Loan Documents, or
         (C) any amounts then due in connection with the operation, man-
         agement, maintenance and repair of the Mortgaged Premises, in-
         cluding (without limitation) amounts then due for tenant im-
         provements or other capital expenditures, real property taxes
         or assessments (provided, however, Mortgagor shall be deemed to
         have paid real property taxes to the extent of payments made by
         Mortgagor into escrow pursuant to the Tax Processing Agreement)
         insurance premiums, salaries, service contracts, utilities, or
         labor or material for work performed at or for the benefit of
         the Mortgaged Premises, or (2) the use by Mortgagor of security
         deposits, insurance proceeds, condemnation awards or other re-
         stricted funds for purposes other than the purposes set forth
         in any lease, contract or other agreement binding upon Mort-
         gagor and governing the use of such funds.  Notwithstanding the
         foregoing, the following circumstances alone shall not consti-
         tute a "Misapplication":  if Mortgagor shall pay a Distribu-
         tion, at such time as there shall be no outstanding Event of
         Default, and amounts are then due and owing by Mortgagor either
         (1) for capital improvement costs, tenant improvement costs or
         other items for which Mortgagor has submitted a Withdrawal Re-
         quest (as defined in the Cash Collateral Agreement) and for
         which Mortgagor is then entitled to receive amounts under the
         Cash Collateral Agreement (provided that Mortgagor shall
         promptly pay such expenditures upon receipt of such funds from
         the Cash Collateral Account) or (2) for expenditures incurred
         for materials (the cost of which is reimbursable under the Cash
         Collateral Agreement) purchased or in fabrication and to be
         delivered pursuant to binding contracts reasonably committed to
         at the time of execution taking into account sums on deposit in
         the Cash Collateral Account.

                   (c)  In Section 5.02 of the Mortgage, (i) the words
         "Limitation on Mortgagor's Liability" are hereby deleted from
         the caption of such Section 5.02, and (ii) the entire second
         sentence of such Section 5.02 is hereby deleted.

                   (d)  This Section 6 as it applies to Mortgagor shall
         supersede, amend and restate in its entirety Section 7 of the
         1995 Modification Agreement.

                                      -9-
<PAGE>
 
                   7.  Certain Additional Modifications.
                       --------------------------------

                   (a)  Section 2.09.7 of the Mortgage, as amended by the 1995
         Modification Agreement, is hereby amended by substituting "Mortgagor
         General Partner" for "Managing General Partner of Mortgagor", and by
         deleting the text: "(or, by the managing member of Mortgagor if
         Mortgagor has converted to a limited liability company in accordance
         with the terms of the Mortgage)".

                   (b)  Section 2.19 of the Mortgage, as amended by the 1995
         Modification Agreement, is hereby amended by deleting the last sentence
         therefrom in its entirety.

                   (c)  Section 2.20 of the Mortgage, as amended by the 1995
         Modification Agreement, is hereby amended by substituting "Mortgagor"
         for "a Permitted Controlling Party".

                   (d)  Section 2.21 of the Mortgage, as amended by the 1995
         Modification Agreement, is hereby amended by substituting "the
         Mortgagor General Partner" for "a Permitted Controlling Party".

                   (e)  Section 2.22 of the Mortgage, as amended by the 1995
         Modification Agreement, is hereby amended and restated in its entirety,
         as follows:

                        "2.22.  Existence.  Mortgagor shall preserve and 
                                ---------
              maintain its existence as a limited partnership under the laws of
              the State in which it is organized and its rights, franchises,
              licenses and privileges material to its business."

                   (f)  Section 4.04 of the Mortgage, as amended by the 1995
         Modification Agreement, is hereby amended by substituting "Mortgagor
         General Partner" for "Managing General Partner of Mortgagor", and by
         deleting the text: "(or, by the managing member of Mortgagor if
         Mortgagor has converted to a limited liability company in accordance
         with the terms of the Mortgage)".

                   (g)  Sections 5.01(h) and 5.01(i) of the Mortgage are hereby
         amended (i) by substituting "Controlling Party" for "general partner"
         in the first, twenty-first and twenty-third lines of Section 5.01(h)
         and in the tenth, twelfth and sixteenth lines of Section 5.01(i), and
         (ii) by inserting in the second line of Section 5.01(i) after
         "proceeding against Mortgagor", the text: ", any Controlling Party".

                                      -10-
<PAGE>
 
                   (h)  Section 7.04 of the Mortgage is hereby amended and
         restated, in its entirety, to read as follows:

                        "7.04.  Notices, etc.  All notices, demands, requests,
                                ------------
              consents, approvals and other instruments under this Mortgage or
              the Notes shall be in writing and shall be deemed to have been
              actually or properly given if and when mailed by first-class
              registered or certified mail, return receipt requested, postage
              prepaid, or by personal delivery (with a receipt obtained
              therefor) or recognized overnight courier service, addressed (a)
                                                                            -
              if to Mortgagor, to Boston Properties Limited Partnership, 599
              Lexington Avenue, New York, New York 10022, Attention, Robert
              Selsam, or at such other address as Mortgagor may have designated
              by notice to Mortgagee, with a copy to Goodwin, Proctor & Hoar,
              LLP, Exchange Place, Boston, Massachusetts 02109, Attention,
              Edward M. Schulman, Esq., with a copy to Weil, Gotshal & Manages
              LLP, 767 Fifth Avenue, New York, New York 10153, Attention, Alan
              J. Pomerantz, Esq. or to such other firms as Mortgagor may direct
              in writing, (b) if to Mortgagee originally named herein, to John
                           -
              Hancock Mutual Life Insurance Company, John Hancock Place, P.O.
              Box 111, Boston, Massachusetts 02117, Attention, Real Estate
                                                    ---------
              Investment Group, Floor T-52, or at such other address as
              Mortgagee may have designated by notice to Mortgagor, or (c) if
                                                                        -
              to any holder of any Note, other than Mortgagee originally named
              herein, at such address as such holder may have designated by
              notice to Mortgagor, or, until an address is so designated, to and
              at the address of the last holder of such Note so designating an
              address to Mortgagor. The foregoing insertion of Mortgagor's
              mailing address shall be deemed to be a request by Mortgagor that
              a copy of any notice of default and of any notice of sale
              hereunder be mailed to Mortgagor at such address as provided by
              law."

                   (i)  Mortgagor and Mortgagee covenant and agree that all
         representations, warranties, covenants, liabilities and obligations of
         Mortgagor under the Corner Parcel Indemnity (attached as Exhibit C
                                                                  ---------
         hereto), the Environmental Indemnity (attached as Exhibit D hereto)
                                                           ---------
         and under any of the other 1997 Modification Documents and under the
         Transfer Documents shall be deemed to be incorporated in the Mortgage
         and shall be secured by the lien of the Mortgage and by any lien
         created by, or arising under, any other Loan Document.

                                      -11-
<PAGE>
 
                   8.  Cross-Defaults. Mortgagor shall comply in all respects
                       --------------
         with Mortgagor's covenants and obligations under this Agreement, the
         Cash Collateral Agreement, the Environmental Indemnity, the Corner
         Parcel Indemnity, the Assignment of Rents, the Assignment of Leases,
         and all of the other Loan Documents, and any default by Mortgagor in
         the performance and observance of its covenants and obligations under
         any of such documents shall (subject to any notice and cure provisions
         specifically set forth in such documents, or, if none are set forth in
         such documents, subject to the notice and cure provisions contained in
         Section 5.01(d) of the Mortgage) be deemed to be an Event of Default by
         Mortgagor under the Mortgage.

                   9.  Modification Agreement Governs. In the event of any
                       ------------------------------
         conflict or inconsistency between this Agreement and the terms and
         conditions of the Mortgage, the Notes, or any other Loan Document, then
         the terms and conditions of this Agreement shall govern and prevail,
         and the conflicting or inconsistent terms and conditions of the
         Mortgage, the Notes or such other Loan Document shall be deemed to be
         amended accordingly.

                   10.  References to "Mortgage" and "Notes". From and after the
                        ------------------------------------
         date hereof, (a) all references herein, in the Consolidation
         Agreement, the Mortgage, the Notes or in any other Loan Document to
         "the Mortgage" and to "this Mortgage" shall be deemed to refer to the
         Consolidation Agreement as amended by the 1990 Modification Agreement,
         the 1992 Modification Agreement, the 1995 Modification Agreement, and
         by this Agreement, and as hereafter amended, modified or supplemented
         from time to time, and (b) all references herein and in the
         Consolidation Agreement, the Mortgage, the Notes or in any other Loan
         Document to "the Notes" or "this Note" shall be deemed to refer to the
         Notes, as amended by the 1990 Modification Agreement, the 1992
         Modification Agreement, the 1995 Modification Agreement, and by this
         Agreement, and as hereafter amended, modified or supplemented from time
         to time.

                   11.  No Offsets or Defenses. Mortgagor hereby represents and
                        ----------------------
         warrants to Mortgagee that, as of the date hereof, (a) the outstanding
         principal amount owing under the Notes and secured by the Mortgage is
         One Hundred Eighty Million and No/100 Dollars ($180,000,000.00), which
         amount Mortgagor covenants to pay in accordance with all of the terms
         and provisions of the Notes and the Mortgage; and (b) Mortgagor has no
         offsets or defenses to the Mortgage, the Notes or any of the Loan
         Documents of any kind whatsoever (and Mortgagor hereby expressly waives
         any and all of the same).

                                      -12-
<PAGE>
 
                   12.  Representations and Warranties. Mortgagor hereby
                        ------------------------------
         represents and warrants to Mortgagee as follows:

                   (a)  This Agreement, the other 1997 Modification Documents
         and the Transfer Documents have been duly executed by the Mortgagor and
         each constitutes the legal, valid and binding obligation of Mortgagor,
         enforceable against Mortgagor in accordance with its terms, except as
         limited by applicable bankruptcy, insolvency, moratorium,
         reorganization and similar laws affecting the rights of creditors
         generally, and except as limited by equitable principles of general
         application.

                   (b)  No authorization, consent, approval, license or formal
         exemption from, nor any filing, declaration or registration with, any
         federal, state, local or foreign court, governmental agency or
         regulatory authority or any other person or entity is required in
         connection with the making and performance by Mortgagor of this
         Agreement, the other 1997 Modification Documents or the Transfer
         Documents, except for such consents, approvals and authorizations
         which have already been obtained.

                   (c)  Mortgagor is a limited partnership duly organized,
         validly existing and in good standing under the laws of the State of
         Delaware and has all requisite power and authority to own and operate
         its properties, to carry on its business as now conducted and proposed
         to be conducted, to execute, deliver and perform this Agreement, the
         other 1997 Modification Documents and the Transfer Documents. This
         Agreement has been duly authorized by all necessary action on the part
         of Mortgagor.

                   (d)  The execution, delivery, recordation and performance of
         this Agreement, the other 1997 Modification Documents and the Transfer
         Documents and the consummation of the transactions contemplated hereby
         and thereby will not contravene, result in any violation of, result in
         a breach of, be in conflict with or constitute a default or event of
         default under any term or provision of Mortgagor's partnership
         agreement or of any term or condition of any contract, agreement, lease
         or instrument, judgment, decree, order, statute, rule, regulation,
         ordinance, franchise, certificate, permit or the like applicable to
         Mortgagor or the Mortgaged Premises or any part thereof or by which
         Mortgagor or its properties or assets may be bound or affected.

                   (e)  To the best of Mortgagor's knowledge, no consent,
         approval, order or authorization of, or designation, registration,
         declaration or filing with, or notice to or action to be taken in
         respect of any governmental or public authority,

                                      -13-
<PAGE>
 
         body or agency is required in connection with the valid execution,
         delivery and performance by Mortgagor of this Agreement, the other 1997
         Modification Documents or the Transfer Documents or the carrying out of
         any of the transactions contemplated hereby or thereby except the
         recordation of this Agreement, the 1997 Amendment, the other applicable
         1997 Modification Documents and the applicable Transfer Documents with
         the Register's Office and the filing of all necessary financing
         statements with respect thereto.

                   (f)  To the best of Mortgagor's knowledge, there is no
         action, suit, proceeding or investigation pending or threatened, or
         any basis therefor known to Mortgagor which questions the validity of
         the Mortgage, the Notes, any other Loan Document, the Consolidation
         Agreement, this Agreement, the 1997 Modification Documents or the
         Transfer Documents, or any action taken or to be taken pursuant
         thereto.
                   (g)  To the best of Mortgagor's knowledge, except as
         previously disclosed in writing to the Mortgagee, (A) there are no
         pending or anticipated material modifications to any Space Leases, (B)
         except for the Consent and that certain letter agreement dated November
         ____, 1997 among Mortgagee, Mortgagor and Original Mortgagor (the
         "Consent Letter"), there are no anticipated requests by Mortgagor
          --------------
         pursuant to the Mortgage for the consent or approval of Mortgagee, and
         (C) no events or circumstances have occurred that would have a
         material adverse effect on the Mortgaged Premises or the operation,
         management or profitability thereof.

                   (h)  There has been no material adverse change to Mortgagor
         from the date of the Consent Letter to the date of execution of this
         Agreement, and the principal terms of the Transfer and the proposed
         structure of Mortgagor as described in the Consent Letter have remained
         unchanged.

                   (i)  There have been no amendments, modifications or
         supplements to that certain Contribution Agreement, dated as of
         September 2, 1997 between Mortgagor and Original Mortgagor.

                   (j)  Mortgagor General Partner is the only Controlling Party
         of Mortgagor.

                   (k)  The reference in Section 5.01(e) of the Mortgage to "any
         warranty, representation or other statement made by or on behalf of
         Mortgagor in or pursuant to this Mortgage" shall include, without
         limitation, the representations and warranties of Mortgagor set forth
         in this Section 12 (as reconfirmed and restated) and in the
         Environmental Indemnity, the Corner Parcel

                                      -14-
<PAGE>
 
         Indemnity, any other 1997 Modification Document and in the Transfer
         Documents.

                   (l)  A representation or warranty made in this Section 12
         "to the best of Mortgagor's knowledge" means that Mortgagor shall be
         deemed to have made a reasonable investigation and inquiry with respect
         to such representation or warranty.

                   (m)  The meaning of the term "material", as used in this
         Section 12, shall be determined solely as of the date of this
         Agreement.

                   13.  Same Indebtedness; Maximum Principal Amount.
                        -------------------------------------------

                   (a)  Mortgagor and Mortgagee hereby certify that this
         Agreement secures the same indebtedness as is secured by the
         Consolidation Agreement as amended by the 1990 Modification Agreement,
         the 1992 Modification Agreement and the 1995 Modification Agreement,
         and no new or further indebtedness is secured by, or under any
         contingency may be secured by, the Mortgage.

                   (b)  Notwithstanding anything to the contrary contained
         herein or in the Mortgage, the maximum amount of principal
         indebtedness secured by the Mortgage at the time of execution hereof,
         or which under any contingency may become secured by the Mortgage at
         any time hereafter, is One Hundred Eighty Million and No/100 Dollars
         ($180,000,000).

                   (c)  This Mortgage, in addition to the maximum principal
         indebtedness described above, secures interest due under the Notes and
         Out-of-Pocket Costs expended by the Mortgagee. As used in this Section
         13, "Out-of-Pocket Costs" shall mean (i) any and all sums actually paid
         or required to be paid by the Mortgagee for real estate taxes, taxes on
         rents or rentals or insurance premiums as provided in the Mortgage, and
         any and all other sums actually paid or required to be paid by the
         Mortgagee pursuant to the terms of the Mortgage to protect and preserve
         the Mortgaged Premises or the Mortgagee's interest therein, (ii) any
         and all sums, including, without limitation, judgments, settlements or
         compromises, reasonable attorneys' fees and other costs and expenses,
         paid by the Mortgagee in connection with any suit, action, legal
         proceeding or dispute of any kind, in which the Mortgagee is a party or
         appears, arising from or related to the lien of the Mortgage, and (iii)
         any amount, cost or charges with respect to which the Mortgagee becomes
         subrogated, upon payment, in respect of any lien which may affect the
         validity or priority of the Mortgage, whether under recognized
         principles of law or equity, or under express statutory authority.

                                      -15-
<PAGE>
 
                   14.  No Waiver. Nothing contained in this Agreement shall be
                        ---------
         deemed to constitute a waiver by Mortgagee of its rights under the
         Mortgage if any payment is not made strictly in accordance with the
         terms of the Notes or the Mortgage, as modified hereby. Nothing
         contained in this Agreement shall be deemed to constitute a waiver by
         Mortgagee of any right or remedy available to Mortgagee arising out of
         a default by Mortgagor under the Notes or the Mortgage, as modified
         hereby.

                   15.  Ratification. Except as amended or modified hereby, the
                        ------------
         terms and conditions of the Mortgage and the Notes are hereby ratified
         and confirmed in their entirety.

                   16.  Successors and Assigns. This Agreement and all of the
                        ----------------------
         covenants herein shall be deemed to be covenants running with the land
         and shall bind and inure to the benefit of the parties hereto and their
         successors and permitted assigns.

                   17.  Counterparts. This Agreement may be executed in several
                        ------------
         counterparts, each of which shall constitute one and the same
         instrument.

                   18.  Lien Law. This Agreement is made subject to the trust
                        --------
         fund provisions of Section 13 of the New York Lien Law.

                   19.  Further Assurances. Mortgagor, at its expense, will
                        ------------------
         execute, acknowledge and deliver or cause to be executed, acknowledged
         and delivered all such instruments and take all such action as
         Mortgagee from time to time may reasonably request in order that
         Mortgagee may obtain the full benefits of this Agreement, the Notes,
         the Mortgage, the Consolidation Agreement, the Assignment of Rents, the
         Assignment of Leases, the Tax Processing Agreement, the Cash Collateral
         Agreement, the Environmental Indemnity, the Corner Parcel Indemnity and
         the other Loan Documents, and the full benefits of the rights, powers
         and remedies intended to be granted thereby.


                   20.  New York Law.
                        ------------

                   (a)  This Agreement shall be governed by and construed and
         enforced in accordance with the procedural and substantive laws of the
         State of New York. Any legal action or proceeding with respect to this
         Agreement must be brought in the courts of the State of New York within
         the First Judicial Department 1st District, New York City or of the
         United States of America for the Southern District of New York, and,
         each party hereto hereby accepts for itself and in respect of its
         property, generally and unconditionally, the jurisdiction of the
         aforesaid courts.

                                      -16-
<PAGE>
 
                   (b)  Each party hereto hereby irrevocably waives any
         objection which it may now or hereafter have to the laying of venue of
         any of the aforesaid actions or proceedings arising out of or in
         connection with this Agreement brought in the courts referred to in
         clause (a) above, and hereby further irrevocably waives and agrees not
         to plead or claim in any such court that any such action or proceeding
         brought in any such court has been brought in an inconvenient forum.
         Each party hereto further hereby waives the defense of sovereign
         immunity.


                   [Remainder of Page Intentionally Left Blank]

                                      -17-
<PAGE>
 
                   IN WITNESS WHEREOF, the parties hereto have caused this Note
         and Mortgage Modification and Spreader Agreement to be duly executed as
         of the day and year first above written.

                                      MORTGAGOR:

                                      BOSTON PROPERTIES LIMITED PARTNERSHIP,
                                        A Delaware Limited Partnership

                                      By:  Boston Properties, Inc.,
                                           General Partner

                                           By: /s/ Robert Selsam
                                              ------------------------------
                                                Name:  Robert Selsam
                                                Title: Senior Vice President


                                      MORTGAGEE:

                                      JOHN HANCOCK MUTUAL LIFE INSURANCE
                                        COMPANY, a Massachusetts
                                        corporation

                                      By: /s/ Debbie Orloff
                                         -----------------------------------
                                         Name:  Debbie Orloff
                                         Title: Investment Officer
<PAGE>
 
         STATE OF NEW YORK   )
                             :    ss:
         COUNTY OF NEW YORK  )



                   On this ___ day of November, 1997, before me personally came
         ____________________, to me known to be the person(s) who executed the
         foregoing instrument, and who, being duly sworn by me, did depose and
         say that he/she is the _________________ of Boston Properties, Inc., a
         Delaware corporation, the general partner of Boston Properties Limited
         Partnership, a limited partnership duly organized under the laws of
         the State of Delaware, having an address at 599 Lexington Avenue, New
         York, New York 10022; and that he/she has authority to sign the
         foregoing instrument for and on behalf of Boston Properties Limited
         Partnership, and he/she acknowledged to me that he/she executed the
         same as the act and deed of said partnership for the use and purposes
         therein mentioned.



                                        -------------------------------------
                                                 Notary Public
<PAGE>
 
         COMMONWEALTH OF MASSACHUSETTS )
                                       :    ss.:
         COUNTY OF SUFFOLK             )


                   On this ___ day of November, 1997, before me personally came
         _______, to me known to be the person who executed the foregoing
         instrument, and who, being duly sworn by me, did depose and say that he
         resides at ________________; that he is a ______________ of John
         Hancock Mutual Life Insurance Company, the corporation described in and
         which executed the foregoing instrument; that he knows the seal of said
         corporation; that the seal affixed to said instrument is such corporate
         seal; that it was so affixed by order of the Board of Directors of said
         corporation, and that he signed his name thereto by like order.



                                        -------------------------------------
                                                 Notary Public

<PAGE>
 
                                                        Exhibit 10.42


                     ENVIRONMENTAL INDEMNITY AND AGREEMENT
                     -------------------------------------

                   ENVIRONMENTAL INDEMNITY AND AGREEMENT (this "Agree-
                                                                ------
         ment"), dated as of November __, 1997, made by BOSTON PROPER-
         ----
         TIES LIMITED PARTNERSHIP ("Mortgagor"), a Delaware limited
                                    ---------
         partnership, having an address at 599 Lexington Avenue, New
         York, New York 10022, in favor of JOHN HANCOCK MUTUAL LIFE IN-
         SURANCE COMPANY ("Mortgagee"), a Massachusetts corporation,
                           ---------
         having its principal office at John Hancock Place, Post Office
         Box 111, Boston, Massachusetts 02117, Attention:  Real Estate
         Investment Group, T-52.


                                   WITNESSETH:
                                   ----------
                   WHEREAS, Mortgagor is, on the date hereof, (a) the
         owner of fee title to a parcel of land and the improvements
         thereon known as 875 Third Avenue, New York, New York and the
         easements appurtenant thereto (collectively, the "Original Fee
                                                           ------------
         Parcel"), all as more particularly described in Exhibit A-1
         ------                                          -----------
         hereto, and (b) the owner of fee title to the Corner Parcel and
         all Improvements thereon (as such terms are defined in the
         Mortgage, as hereinafter defined), which Corner Parcel is con-
         tiguous to the Original Fee Parcel and is more particularly
         described on Exhibit A-2 hereto (the Original Fee Parcel and
                      ----------- 
         the Corner Parcel are collectively described on Exhibit A-3
                                                         -----------
         hereto);

                   WHEREAS, Mortgagee is on the date hereof the owner
         and holder of certain mortgages which were consolidated, ex-
         tended and modified pursuant to that certain Consolidation,
         Extension and Modification Agreement (the "Consolidation Agree-
                                                    --------------------
         ment"), dated as of May 11, 1988, between Kenvic Associates, a
         ----
         New York general partnership ("Original Mortgagor") and Mort-
                                        ------------------
         gagee, recorded on May 18, 1988 in the Office of the City Reg-
         ister, New York County (the "Register's Office") in Reel 1403,
                                      -----------------
         Page 1793, so as to form a single first lien on the Mortgaged
         Premises securing the original principal amount of
         $180,000,000, and were further modified (i) pursuant to that
         certain Modification Agreement, dated as of May 30, 1990, be-
         tween Original Mortgagor and Mortgagee, recorded on June 28,
         1990 in the Register's Office in Reel 1705, Page 1760 (the
         "1990 Modification Agreement"), (ii) pursuant to that certain
          ---------------------------
         Note and Mortgage Modification Agreement, dated as of July 23,
         1992, between Original Mortgagor and Mortgagee, recorded on
         July 30, 1992 in the Register's Office in Reel 1892, Page 434
         (the "1992 Modification Agreement"), (iii) pursuant to that
               ---------------------------
         certain Note and Mortgage Modification and Spreader Agreement,
         dated as of December 29, 1995, between Original Mortgagor and<PAGE>
<PAGE>
 
         Mortgagee, recorded on January 5, 1996 in the Register's Office
         in Reel 2279, Page 443 (the "1995 Modification Agreement"); and
                                      ---------------------------
         (iv) pursuant to that certain Note and Mortgage Modification
         and Spreader Agreement, dated as of the date hereof, between
         Mortgagor and Mortgagee, intended to be recorded in the
         Register's Office following the execution thereof (the "1997
         Modification Agreement"; the Consolidation Agreement as amended
         ----------------------
         by the 1990 Modification Agreement, the 1992 Modification
         Agreement, the 1995 Modification Agreement and the 1997 Modifi-
         cation Agreement is hereinafter referred to as the "Mortgage";
                                                             --------
         any capitalized terms used herein and not defined herein shall
         have the respective meanings assigned to them in the Mortgage);

                   WHEREAS, as of the date hereof, (i) Original Mort-
         gagor has, in exercise of its rights under Section 6 of the
         1995 Modification Agreement, conveyed to Mortgagor all of Orig-
         inal Mortgagor's right, title and interest in and to the Orig-
         inal Fee Parcel, (ii) Mortgagee and Original Mortgagor have
         terminated the Corner Parcel Lease, (iii) Mortgagee has con-
         veyed to Mortgagor Mortgagee's fee title in and to the Corner
         Parcel, and (iv) Mortgagor has agreed to assume all of Original
         Mortgagor's obligations arising from and after the date hereof
         under the Notes, the Mortgage and the other Loan Documents pur-
         suant to that certain Assumption, dated as of the date hereof,
         by Mortgagor for the benefit of Mortgagee and Original Mort-
         gagor and their respective successors and assigns (the transac-
         tions described in subparagraphs (i), (ii), (iii) and (iv)
         above shall hereinafter be collectively referred to as the
         "Transfer"); and
          --------

                   WHEREAS, Mortgagor, in consideration of the foregoing
         and of Mortgagee's agreement to consent to the Transfer, has
         agreed to execute and deliver this Agreement.

                   NOW, THEREFORE, in consideration of the premises and
         the mutual covenants herein contained and for other good and
         valuable consideration, the receipt of which is hereby acknowl-
         edged, the parties hereto agree as follows:

                   1.  Representations.  Mortgagor represents and war-
                       ---------------
         rants to Mortgagee that:

                   (a)  except for those matters disclosed in that cer-
              tain Phase I Environment Site Assessment for the Mortgaged
              Premises prepared by Ambient Labs Inc. and dated October
              3, 1997 (the "Environmental Report"), to the best of
                            --------------------
              Mortgagor's knowledge, the Mortgaged Premises do not con-
              tain any hazardous substance, hazardous material, haz-
              ardous waste, toxic substance or solid waste, as defined

                                      - 2 -
<PAGE>
 
              in the Clean Air Act, the Comprehensive Environmental Re-
              sponse, Compensation and Liability Act of 1980, as
              amended, the Resource Conservation and Recovery Act of
              1976, as amended, or the Hazardous Materials Transporta-
              tion Act, any substances or materials listed as hazardous
              or toxic in the United States Department of Transportation
              Table, by the Environmental Protection Agency or any suc-
              cessor agency or under any federal, state or local laws or
              regulations, or any asbestos, asbestos-containing materi-
              als, polychlorinated biphenyls, radon gas, urea formalde-
              hyde foam, pollutants, contaminants, volatile organic com-
              pounds, explosive or radioactive materials (all of the
              above being collectively called "Hazardous Substances")
                                               --------------------
              which, in any such case, violate any federal, state or
              local laws, statutes, rules, codes, regulations or orders
              relating to Hazardous Substances (collectively, "Environ-
                                                               ---------
              mental Laws");
              -----------

                   (b)  except for those matters disclosed in the Envi-
              ronmental Report, to the best of Mortgagor's knowledge,
              there have been no releases or threatened releases at,
              upon, under, or within, nor past or ongoing migration from
              neighboring lands to, the Mortgaged Premises, of any Haz-
              ardous Substances; which, in any such case, violate any
              Environmental Law; and

                   (c)  except as disclosed in the Environmental Cer-
              tificate (hereafter defined), Mortgagor has received no
              notice from any governmental authority or from any tenant
              or other occupant or from any other person with respect to
              any release of any Hazardous Substance at, upon, under, or
              within the Mortgaged Premises.

                   2.  Use of Mortgaged Premises.  Mortgagor will not
                       -------------------------
         use, generate, manufacture, produce, store, release, threaten
         to release, discharge or dispose of (or permit any of the same)
         or permit to exist on or about the Mortgaged Premises or trans-
         port (or permit to be transported) any Hazardous Substance to
         or from the Mortgaged Premises in a manner which would violate
         any Environmental Law, and, if the same exist, Mortgagor will,
         if and to the extent required by any Environmental Law, im-
         mediately remove or cause to be removed from the Mortgaged Pre-
         mises, any such Hazardous Substance.  Mortgagor has not been,
         is not, and will not become involved in, and will not permit,
         operations at, in or about the Mortgaged Premises which could
         lead to the imposition of liability under any Environmental
         Law.  Notwithstanding the foregoing, with respect to any claim
         under this Section 2 arising from the act or omission of any
         tenant, subtenant, licensee or other occupant of the Mortgaged
         Premises, Mortgagor's obligations under this Section 2 shall be


                                      - 3 -
<PAGE>
 
         to promptly and diligently exercise any available remedies
         against such Person in order to cause such Person to cure any
         such default.

                   3.  Compliance.  Mortgagor, at its expense, will
                       ----------
         cause the Mortgaged Premises to comply with all Environmental
         Laws.  Notwithstanding the foregoing, with respect to any claim
         under this Section 3 arising from the act or omission of any
         tenant, subtenant, licensee or other occupant of the Mortgaged
         Premises, Mortgagor's obligations under this Section 3 shall be
         to promptly and diligently exercise any available remedies
         against such Person in order to cause such Person to cure any
         such act or omission.

                   4.  Notice.  Mortgagor will deliver to Mortgagee,
                       ------
         without request or demand, promptly upon becoming aware of any
         presence or release or alleged or threatened presence or re-
         lease of any Hazardous Substance in violation of any Environ-
         mental Law at, upon, under, within or about the Mortgaged Pre-
         mises and immediately upon becoming aware that any regulatory
         agency, governmental body or other person has made any claim or
         taken or threatened to take any action relating to Hazardous
         Substances on or emanating from the Mortgaged Premises or any
         property adjacent to or abutting the Mortgaged Premises, and
         promptly upon receipt of any notice from any governmental
         agency or authority or from any tenant or other occupant or
         from any other person with respect to any such alleged presence
         or release, a notice specifying the facts relating thereto, the
         claim made or action taken or threatened and what action Mort-
         gagor is taking or causing to be taken or proposes to take or
         to cause to be taken with respect thereto.

                   5.  Inspection.  Mortgagor will permit Mortgagee, and
                       ----------
         any representatives designated by Mortgagee, to visit and in-
         spect the Mortgaged Premises or any part thereof, and to sample
         and monitor soil and groundwater and to inspect for Hazardous
         Substances all at such reasonable times and intervals as from
         time to time may be requested and upon reasonable notice and in
         a manner that does not unreasonably interfere with the business
         operations of any tenant or otherwise violates, in any material
         respect, any such tenant's rights under its respective lease.
         In the event that such inspection results from Mortgagee's rea-
         sonable belief that there has been a breach of Mortgagor's rep-
         resentations or covenants set forth in this Agreement, then
         Mortgagor shall bear the reasonable cost of such inspection;
         otherwise, Mortgagee shall bear the cost of such inspection.
         Mortgagee shall not have any duty to make any such inspection
         and shall not incur any liability or obligation for not making
         any such inspection or, once having undertaken any such inspec-
         tion, for not making the same carefully or properly, or for not


                                      - 4 -
<PAGE>
 
         completing the same; nor shall the fact that such inspection
         may not have been made by Mortgagee relieve Mortgagor of any
         obligations that it may otherwise have under the Mortgage or
         this Agreement.

                   6.  Indemnification.  Notwithstanding any provision
                       ---------------
         in the Mortgage, the Notes or any other Loan Document limiting
         or negating the liability of Mortgagor, Mortgagor will protect,
         indemnify, save harmless and defend Mortgagee from and against
         any and all liabilities, obligations, claims, losses, damages,
         penalties, causes of action, reasonable costs and expenses (in-
         cluding, without limitation, reasonable attorneys' fees and
         expenses) (collectively, the "Claims") imposed upon, suffered
                                       ------
         or incurred by or asserted against Mortgagee by reason of the
         presence, release, threatened release or removal of any Hazard-
         ous Substances at, upon, under, within or about the Mortgaged
         Premises or any non-compliance with any legal requirement re-
         lating thereto, whether arising before, during or after en-
         forcement of Mortgagee's rights and remedies upon default and
         whether or not Mortgagor is responsible therefor, including,
         without limitation, any imposition by any governmental author-
         ity of any lien or so-called "super priority lien" upon the
         Mortgaged Premises, clean-up costs, response costs, liability
         for personal injury or property damage or damage to the envi-
         ronment and any fines, penalties and punitive damages with re-
         spect thereto.

                   7.  Environmental Certificates.  In connection with
                       --------------------------
         the 1995 Modification, Original Mortgagor delivered to Mort-
         gagee an Environmental Questionnaire and Certificate (the "En-
                                                                    ---
         vironmental Certificate"), dated October 30, 1995, a copy of
         -----------------------
         which has been delivered to Mortgagor.  Mortgagor covenants
         that

                   (a)  Mortgagor will promptly notify Mortgagee in
              writing if Mortgagor learns that any of the answers on the
              Environmental Certificate either was not true in any mate-
              rial respect when made or is no longer true in any mate-
              rial respect; and

                   (b)  if any event shall occur which causes any of the
              answers on the Environmental Certificate to be no longer
              true or if Mortgagee shall learn that any of the answers
              on the Environmental Certificate were not true when made,
              such event or occurrence shall, if not cured within twenty
              (20) days after notice of such event or occurrence is de-
              livered to Mortgagor (whether from Mortgagee or any other
              party), constitute an Event of Default under the Mortgage,
              giving the Mortgagee all the rights and remedies available
              to it upon the occurrence of an Event of Default, provided


                                      - 5 -
<PAGE>
 
              that if such cure cannot with due diligence and dispatch
              be effected within such 20 day period, then such 20 day
              period shall be deemed extended for such period as Mort-
              gagor shall be attempting to effect such cure with due
              diligence and dispatch.

                   8.  Survival.  The obligations of Mortgagor under
                       --------
         Section 6 of this Agreement shall survive any payment of the
         Notes, any discharge, satisfaction, release or assignment of
         the Mortgage, any transfer of the Mortgaged Premises or any
         part thereof, any exercise of remedies by Mortgagee, including,
         without limitation, the appointment of a receiver, any foreclo-
         sure of the Mortgage or any transfer of the Mortgaged Premises
         (or any part thereof) by deed in lieu of foreclosure and any
         other event or circumstance whatsoever.

                   9.   Personal Liability.  In accordance with Sec-
                        ------------------
         tion 6 of the 1997 Modification Agreement, Mortgagor shall be
         personally liable for all of its representations, covenants and
         obligations set forth in this Agreement.

                   10.  Binding Effect.  This Agreement shall inure to
                        --------------
         the benefit of Mortgagee and its successors and assigns, and
         shall be binding upon Mortgagor and its respective successors
         and assigns.

                   11.  Counterparts.  This Agreement may be executed in
                        ------------
         several counterparts, each of which shall constitute one and
         the same instrument.

                   12.  Notices.  All notices, demands, requests, con-
                        -------
         sents, approvals and other instruments under this Agreement
         shall be in writing and shall be deemed to have been actually
         or properly given if and when mailed by first-class registered
         or certified mail, return receipt requested, postage prepaid,
         or by personal delivery (with a receipt obtained therefor) or
         recognized overnight courier service, addressed (a) if to Mort-
         gagor, to Boston Properties Limited Partnership, 599 Lexington
         Avenue, New York, New York 10022, Attention, Robert Selsam, or
         such other address as Mortgagor may have designated by notice
         to Mortgagee, with a copy to Goodwin, Proctor & Hoar, LLP, Ex-
         change Place, Boston, Massachusetts 02109, Attention, Edward M.
         Schulman, Esq., with a copy to Weil, Gotshal & Manages LLP, 767
         Fifth Avenue, New York, New York 10153, Attention, Alan J. 
         Pomerantz, Esq. or to such other firms as Mortgagor may direct
         in writing, and (b) if to Mortgagee, to John Hancock Mutual
         Life Insurance Company, John Hancock Place, P.O. Box 111, Bos-
         ton, Massachusetts 02117, Attention, Real Estate Investment
         Group, Floor T-52, or at such other address as Mortgagee may
         have designated by notice to Mortgagor.


                                      - 6 -
<PAGE>
 
                   13.  Miscellaneous.  Mortgagor agrees that:
                        -------------

                   (a)  If any term of this Agreement or any application
              thereof shall be declared invalid, illegal or unenforce-
              able, the remainder of this Agreement and any other ap-
              plication of such terms shall not be affected thereby.

                   (b)  No failure or delay on the part of Mortgagee to
              exercise any power, right or privilege under this Agree-
              ment shall impair any such power, right or privilege or be
              construed to be a waiver of any default or any acquies-
              cence therein, nor shall any single or partial exercise of
              such power, right or privilege preclude other or further
              exercise thereof or of any right, power or privilege.

                   (c)  No provision of this Agreement may be changed,
              waived, discharged or terminated except by an instrument
              in writing signed by the party against whom enforcement of
              the change, waiver, discharge or termination is sought.

                   (d)  This Agreement shall be governed and construed
              in accordance with the laws of the State of New York.

                   (e)  Mortgagor shall pay all reasonable attorneys'
              fees and other reasonable costs and expenses which may be
              incurred by Mortgagee in the enforcement of this Agree-
              ment.







                   [Remainder of Page Intentionally Left Blank]




                                      - 7 -
<PAGE>
 
                   IN WITNESS WHEREOF, the undersigned has caused this
         Environmental Indemnity and Agreement to be duly executed and
         delivered by its duly authorized officers as of the date first
         above written.


                                      MORTGAGOR:

                                      BOSTON PROPERTIES LIMITED
                                      PARTNERSHIP,
                                        A Delaware Limited Partnership

                                      By:  Boston Properties, Inc.,
                                           General Partner

                                           By:  /s/ Robert Selsam
                                                ----------------------------
                                                Name:  Robert Selsam
                                                Title: Senior Vice President
<PAGE>
 
         STATE OF NEW YORK   )
                             :    ss:
         COUNTY OF NEW YORK  )



                   On this ____ day of November, 1997, before me person-
         ally came ___________________, to me known to be the person(s)
         who executed the foregoing instrument, and who, being duly
         sworn by me, did depose and say that he/she is the
         _________________ of Boston Properties, Inc., a Delaware corpo-
         ration, the general partner of Boston Properties Limited Part-
         nership, a limited partnership duly organized under the laws of
         the State of Delaware, having an address at 599 Lexington Ave-
         nue, New York, New York 10022; and that he/she has authority to
         sign the foregoing instrument for and on behalf of Boston Prop-
         erties Limited Partnership, and he/she acknowledged to me that
         he/she executed the same as the act and deed of said partner-
         ship for the use and purposes therein mentioned.



                                        -----------------------------
                                                Notary Public

<PAGE>
 
                                                                   Exhibit 10.43






                            INDEMNIFICATION AGREEMENT
                            -------------------------

                   INDEMNIFICATION AGREEMENT (this "Agreement"), dated
                                                    ---------
         as of November __, 1997, made by BOSTON PROPERTIES LIMITED
         PARTNERSHIP ("Mortgagor"), a Delaware limited partnership, hav-
                       ---------
         ing an address at 599 Lexington Avenue, New York, New York
         10022, in favor of JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY
         ("Mortgagee"), a Massachusetts corporation, having its princi-
           ---------
         pal office at John Hancock Place, Post Office Box 111, Boston,
         Massachusetts 02117, Attention:  Real Estate Investment Group,
         T-52.


                                   WITNESSETH:
                                   ----------

                   WHEREAS, Mortgagor is, on the date hereof, (a) the
         owner of fee title to a parcel of land and the improvements
         thereon known as 875 Third Avenue, New York, New York and the
         easements appurtenant thereto (collectively, the "Original Fee
                                                           ------------
         Parcel"), all as more particularly described in Exhibit A-1
         ------                                          -----------
         hereto, and (b) the owner of fee title to the Corner Parcel and
         all Improvements thereon (as such terms are defined in the
         Mortgage, as hereinafter defined), which Corner Parcel is con-
         tiguous to the Original Fee Parcel and is more particularly de-
         scribed on Exhibit A-2 hereto (the Original Fee Parcel and the
                    -----------
         Corner Parcel are collectively described on Exhibit A-3
                                                     -----------
         hereto);

                   WHEREAS, Mortgagee is on the date hereof the owner
         and holder of certain mortgages which were consolidated, ex-
         tended and modified pursuant to that certain Consolidation,
         Extension and Modification Agreement (the "Consolidation Agree-
                                                    --------------------
         ment"), dated as of May 11, 1988, between Kenvic Associates, a
         ----
         New York general partnership ("Original Mortgagor") and Mort-
                                        ------------------
         gagee, recorded on May 18, 1988 in the Office of the City Reg-
         ister, New York County (the "Register's Office") in Reel 1403,
                                      -----------------
         Page 1793, so as to form a single first lien on the Mortgaged
         Premises (as such term is defined in the Mortgage, as herein-
         after defined) securing the original principal amount of
         $180,000,000, and were further modified (i) pursuant to that
         certain Modification Agreement, dated as of May 30, 1990, be-
         tween Original Mortgagor and Mortgagee, recorded on June 28,
         1990 in the Register's Office in Reel 1705, Page 1760 (the
         "1990 Modification Agreement"), (ii) pursuant to that certain
          ---------------------------
         Note and Mortgage Modification Agreement, dated as of July 23,
         1992, between Original Mortgagor and Mortgagee, recorded on
         July 30, 1992 in the Register's Office in Reel 1892, Page 434
         (the "1992 Modification Agreement"), (iii) pursuant to that
               ---------------------------
         certain Note and Mortgage Modification and Spreader Agreement,
<PAGE>
 
         dated as of December 29, 1995, between Original Mortgagor and
         Mortgagee, recorded on January 5, 1996 in the Register's Office
         in Reel 2279, Page 443 (the "1995 Modification Agreement"); and
                                      ---------------------------
         (iv) pursuant to that certain Note and Mortgage Modification
         and Spreader Agreement, dated as of the date hereof, between
         Mortgagor and Mortgagee, intended to be recorded in the
         Register's Office following the execution thereof (the "1997
                                                                 ----
         Modification Agreement"; the Consolidation Agreement as amended
         ----------------------
         by the 1990 Modification Agreement, the 1992 Modification
         Agreement, the 1995 Modification Agreement and the 1997 Modifi-
         cation Agreement is hereinafter referred to as the "Mortgage";
                                                             --------
         any capitalized terms used herein and not defined shall have
         the respective meanings assigned to them in the Mortgage);

                   WHEREAS, as of the date hereof, (i) Original Mort-
         gagor has, in exercise of its rights under Section 6 of the
         1995 Modification Agreement, conveyed to Mortgagor all of Orig-
         inal Mortgagor's right, title and interest in and to the Orig-
         inal Fee Parcel, (ii) Mortgagee and Original Mortgagor have
         terminated the Corner Parcel Lease, (iii) Mortgagee has con-
         veyed to Mortgagor Mortgagee's fee title in and to the Corner
         Parcel (the transaction described in subparagraph (ii) above
         and this subparagraph (iii) being collectively referred to
         herein as the "Corner Parcel Transfer"), and (iv) Mortgagor has
                        ----------------------
         agreed to assume all of Original Mortgagor's obligations aris-
         ing from and after the date hereof under the Notes, the Mort-
         gage and the other Loan Documents pursuant to that certain As-
         sumption, dated as of the date hereof, by Mortgagor for the
         benefit of Mortgagee and Original Mortgagor and their respec-
         tive successors and assigns (the transactions described in sub-
         paragraphs (i), (ii), (iii) and (iv) above shall hereinafter be
         collectively referred to as the "Transfer"); and
                                          --------
                   WHEREAS, Mortgagor, in consideration of the foregoing
         and of Mortgagee's agreement to consent to the Transfer, has
         agreed to execute and deliver this Agreement.

                   NOW, THEREFORE, in consideration of the premises and
         the mutual covenants herein contained and for other good and
         valuable consideration, the receipt of which is hereby acknowl-
         edged, the parties hereto agree as follows:

                   1.  Indemnification.  Notwithstanding any provision
                       ---------------
         in the Mortgage, the Notes or any other Loan Document limiting
         or negating the personal liability of Mortgagor, Mortgagor
         shall protect, indemnify, save harmless and defend Mortgagee
         from and against any and all transfer taxes, income taxes and
         all other costs, expenses, liabilities, obligations, claims,
         losses, damages, penalties, and causes of action, of any type
         whatsoever (collectively, "Claims"), imposed upon, suffered,


                                       -2-
<PAGE>
 
         incurred by or asserted against Mortgagee at any time by reason
         of the Corner Parcel Transfer, except to the extent that such
         Claims arise from Mortgagee's gross negligence or willful mis-
         conduct.

                   2.  Survival.  The obligations of Mortgagor under
                       --------
         Section 1 of this Agreement shall survive any payment of the
         Notes, any discharge, satisfaction, release or assignment of
         the Mortgage, any transfer of the Mortgaged Premises or any
         part thereof, any exercise of remedies by Mortgagee, including,
         without limitation, the appointment of a receiver, any foreclo-
         sure of the Mortgage or any transfer of the Mortgaged Premises
         (or any part thereof) by deed in lieu of foreclosure and any
         other event or circumstance whatsoever.

                   3.   Personal Liability.  In accordance with Sec-
                        ------------------
         tion 6 of the 1997 Modification Agreement, Mortgagor shall be
         personally liable for all of its obligations set forth in this
         Agreement.

                   4.   Binding Effect.  This Agreement shall inure to
                        --------------
         the benefit of Mortgagee and its successors and assigns, and
         shall be binding upon Mortgagor and its respective successors
         and assigns.

                   5.   Counterparts.  This Agreement may be executed in
                        ------------
         several counterparts, each of which shall constitute one and
         the same instrument.

                   6.   Notices.  All notices, demands, requests, con-
                        -------
         sents, approvals and other instruments under this Agreement
         shall be in writing and shall be deemed to have been actually
         or properly given if and when mailed by first-class registered
         or certified mail, return receipt requested, postage prepaid,
         or by personal delivery (with a receipt obtained therefor) or
         recognized overnight courier service, addressed (a) if to Mort-
         gagor, to Boston Properties Limited Partnership, 599 Lexington
         Avenue, New York, New York 10022, Attention, Robert Selsam, or
         at such other address as Mortgagor may have designated by no-
         tice to Mortgagee, with a copy to Goodwin, Proctor & Hoar, LLP,
         Exchange Place, Boston, Massachusetts 02109, Attention, Edward
         M. Schulman, Esq., with a copy to Weil, Gotshal & Manages LLP,
         767 Fifth Avenue, New York, New York 10153, Attention, Alan J.
         Pomerantz, Esq. or to such other firms as Mortgagor may direct
         in writing, and (b) if to Mortgagee originally named herein, to
         John Hancock Mutual Life Insurance Company, John Hancock Place,
         P.O. Box 111, Boston, Massachusetts 02117, Attention, Real Es-
         tate Investment Group, Floor T-52, or at such other address as
         Mortgagee may have designated by notice to Mortgagor.



                                       -3-
<PAGE>
 
                   7.   Miscellaneous.  Mortgagor agrees that:
                        -------------

                   (a)  If any term of this Agreement or any application
              thereof shall be declared invalid, illegal or unenforce-
              able, the remainder of this Agreement and any other ap-
              plication of such terms shall not be affected thereby.

                   (b)  No failure or delay on the part of Mortgagee to
              exercise any power, right or privilege under this Agree-
              ment shall impair any such power, right or privilege or be
              construed to be a waiver of any default or any acquies-
              cence therein, nor shall any single or partial exercise of
              such power, right or privilege preclude other or further
              exercise thereof or of any right, power or privilege.

                   (c)  No provision of this Agreement may be changed,
              waived, discharged or terminated except by an instrument
              in writing signed by the party against whom enforcement of
              the change, waiver, discharge or termination is sought.

                   (d)  This Agreement shall be governed and construed
              in accordance with the laws of the State of New York.

                   (e)  Mortgagor shall pay all reasonable attorneys'
              fees and other reasonable costs and expenses which may be
              incurred by Mortgagee in the enforcement of this Agree-
              ment.


                   [Remainder of Page Intentionally Left Blank]


                                       -4-
<PAGE>
 
                   IN WITNESS WHEREOF, the undersigned has caused this
         Indemnification Agreement to be duly executed and delivered by
         its duly authorized officers as of the date first above writ-
         ten.


                                  MORTGAGOR:

                                  BOSTON PROPERTIES LIMITED PARTNERSHIP,
                                    A Delaware Limited Partnership

                                  By:  Boston Properties, Inc.,
                                       General Partner

                                       By:  /s/ Robert Selsam
                                            -------------------------------
                                            Name:  Robert Selsam
                                            Title: Senior Vice President
<PAGE>
 
         STATE OF NEW YORK   )
                             :    ss:
         COUNTY OF NEW YORK  )



                   On this ___ day of November, 1997, before me person-
         ally came ___________________, to me known to be the person(s)
         who executed the foregoing instrument, and who, being duly
         sworn by me, did depose and say that he/she is the
         _________________ of Boston Properties, Inc., a Delaware corpo-
         ration, the general partner of Boston Properties Limited Part-
         nership, a limited partnership duly organized under the laws of
         the State of Delaware, having an address at 599 Lexington Av-
         enue, New York, New York 10022; and that he/she has authority
         to sign the foregoing instrument for and on behalf of Boston
         Properties Limited Partnership, and he/she acknowledged to me
         that he/she executed the same as the act and deed of said part-
         nership for the use and purposes therein mentioned.



                                      ------------------------------------
                                                 Notary Public

<PAGE>
 
                      CONSENT OF INDEPENDENT ACCOUNTANTS
 
  We consent to the inclusion in this registration statement on Form S-11
(File No. 333-     ) of our reports dated (i) May 1, 1997 on our audits of the
combined financial statements and financial statement schedule of the Boston
Properties Predecessor Group, (ii) October 17, 1997 on our audit of the
statement of revenue over certain operating expenses of 280 Park Avenue, and
(iii) October 17, 1997 on our audit of the statement of revenue over certain
operating expenses of 875 Third Avenue and (iv) November 3, 1997 on our audit
of the statement of revenue over certain operating expenses of 100 East Pratt
Street and (v) November 25, 1997 on our audit of the statement over revenue
over certain operating expenses of Riverfront Plaza. We also consent to the
reference to our firm under the caption "Experts".
 
                                          /s/ Coopers & Lybrand L.L.P.
 
Boston, Massachusetts
December 3, 1997

<PAGE>
 
                 [LETTERHEAD OF SPAULDING & SLYE APPEARS HERE]
 
                                                                   EXHIBIT 23.2
 
December 1, 1997
 
Mr. David R. Barrett
Senior Vice President
Boston Properties, Inc.
8 Arlington Street
Boston, MA 02118
 
Dear David:
 
In connection with the second public offering of common stock by Boston
Properties, Inc., we hereby consent to the use of our name in the Registration
Statement on Form S-11, to the reference to us as experts in the section
therein under the caption "Experts", and to the incorporation by reference of
this consent in any abbreviated registration statement in connection with the
Company's Common Stock pursuant to Rule 462(b) under the Securities Act.
 
Sincerely,
 
Matthew P. Dwyer, SIOR
Senior Vice President/Principal
 
MPD/dh

<PAGE>
 
       [LETTERHEAD OF INSIGNIA/EDWARD S. GORDON CO., INC. APPEARS HERE]
 
                                                                   EXHIBIT 23.3
 
December 1, 1997
 
Boston Properties, Inc.
8 Arlington Street
Boston, MA 02116
 
Attn: David Barrett, Senior Vice President
 
Gentlemen:
 
In connection with the second public offering of common stock by Boston
Properties, Inc., we hereby consent to the use of our name in the Registration
Statement on Form S-11 to be filed with the Securities and Exchange
Commission, per the page(s) attached and to the incorporation by reference of
this consent in any abbreviated registration statement in connection with the
Company's Common Stock pursuant to Rule 462(b) under the Securities Act.
 
Very truly yours,
 
INSIGNIA/EDWARD S. GORDON CO., INC.
 
[Signature appears here]
 
Stacy L. Wallach

<PAGE>
 
             [LETTERHEAD OF PINNACLE ADVISORY GROUP APPEARS HERE]
 
 
                                                                   EXHIBIT 23.4
 
December 1, 1997
 
Boston Properties, Inc.
8 Arlington Street
Boston Massachusetts 02116
 
Attention: David R. Barrett, Senior Vice President
 
Dear Mr. Barrett:
 
In connection with the second public offering of common stock by Boston
Properties, Inc., we hereby consent to the use of our name in the Registration
Statement on Form S-11 to be filed with the Securities and Exchange Commission
and to the incorporation by reference of this consent in any abbreviated
registration statement in connection with the Company's Common Stock pursuant
to Rule 462(b) under the Securities Act.
 
Very truly yours,
 
/s/
Rachel J. Roginsky
Principal

<PAGE>
 
                                                                   EXHIBIT 23.5

                [LETTERHEAD OF COLLIERS PINKARD APPEARS HERE] 

November 24, 1997
 
Boston Properties, Inc.
8 Arlington Street
Boston, MA 02116
 
Attention: David R. Barrett, Senior Vice President
 
Dear Mr. Barrett
 
In connection with the second public offering of common stock by Boston
Properties, Inc., we hereby consent to the use of our name in the Registration
Statement on Form S-11 to be filed with the Securities and Exchange Commission
as the source of the information we have provided to you and to the
incorporation by reference of this consent in any abbreviated registration
statement in connection with the Company's Common Stock pursuant to Rule
452(b) under the Securities Act.
 
Sincerely,
 
David R. Frederick
COO/Principal

<PAGE>
 
                 [LETTERHEAD OF HARRISON & BATES INCORPORATED]
 
                                                                   EXHIBIT 23.6
 
December 1, 1997
 
Boston Properties, Inc.
8 Arlington Street
Boston, MA 02116
 
Attention: David R. Barrett, Senior Vice President
 
Dear Mr. Barrett:
 
In connection with the second public offering of common stock by Boston
Properties, Inc., we hereby consent to the use of our name in the Registration
Statement on Form S-11 to be filed with the Securities and Exchange Commission
as the source of the information we have provided to you and to the
incorporation by reference of this consent in any abbreviated registration
statement in connection with the Company's Common Stock pursuant to Rule
462(b) under the Securities Act.
 
Sincerely,
 
[Signature appears here]
 
Lynn F. McClellan
Marketing Director

<PAGE>
 
            [LETTERHEAD OF LANDAUER ASSOCIATES, INC. APPEARS HERE]
 
                                                                   EXHIBIT 23.7
 
December 2, 1997
 
Boston Properties, Inc.
8 Arlington Street
Boston, Massachusetts 02116
 
Attention: David R. Barrett, Senior Vice President
 
Dear Mr. Barrett:
 
  In connection with the second public offering of common stock by Boston
Properties, Inc., we hereby consent to the use of our name in the Registration
Statement on Form S-11 to be filed with the Securities and Exchange Commission
as the source of the information we have provided to you and to the
incorporation by reference of this consent in any abbreviated registration
statement in connection with the Company's Common Stock pursuant to Rule
462(b) under the Securities Act.
 
Sincerely,
 
[Signature appears here]
 
Geoffrey Baekey
Managing Director


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