EQUITY OFFICE PROPERTIES TRUST
S-3, 1998-07-14
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 14, 1998
 
                                                      REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
 
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                             ---------------------
 
                         EQUITY OFFICE PROPERTIES TRUST
      (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS GOVERNING INSTRUMENT)
 
<TABLE>
<S>                      <C>
       MARYLAND                        36-4151656
(STATE OF ORGANIZATION)  (I.R.S. EMPLOYER IDENTIFICATION NUMBER)
</TABLE>
 
                     TWO NORTH RIVERSIDE PLAZA, SUITE 2200
                            CHICAGO, ILLINOIS 60606
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
 
                               STANLEY M. STEVENS
                              CHIEF LEGAL COUNSEL
                     TWO NORTH RIVERSIDE PLAZA, SUITE 2200
                            CHICAGO, ILLINOIS 60606
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
                             ---------------------
 
                                   Copies to:
                             J. WARREN GORRELL, JR.
                                JAMES E. SHOWEN
                             HOGAN & HARTSON L.L.P.
                          555 THIRTEENTH STREET, N.W.
                          WASHINGTON, D.C. 20004-1109
                                 (202) 637-5600
                             ---------------------
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after this registration statement becomes effective.
 
     If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]
 
     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]
 
     If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ] ________
 
     If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ] ________
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                             ---------------------
 
                        CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              PROPOSED
                                                                               MAXIMUM
                                                     PROPOSED MAXIMUM         AGGREGATE
         TITLE OF CLASS             AMOUNT TO BE    AGGREGATE PRICE PER       OFFERING             AMOUNT OF
 OF SECURITIES BEING REGISTERED      REGISTERED       COMMON SHARE(1)        PRICE(1)(2)      REGISTRATION FEE(1)
- -----------------------------------------------------------------------------------------------------------------
<S>                                 <C>             <C>                    <C>                <C>
Common Shares of Beneficial
Interest, $.01 par value per
share                                25,956,661          $27.6875           $718,675,051           $212,009
- -----------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Estimated solely for the purpose of computing the registration fee in
    accordance with the Rule 457(c) based on the average of the high and low
    reported sales prices on the New York Stock Exchange on July   , 1998.
(2) Or the equivalent in foreign currencies based on the exchange rate at the
    time of sale.
                             ---------------------
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
     THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE
     MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT RELATING TO
     THESE SECURITIES HAS BEEN DECLARED EFFECTIVE BY THE SECURITIES AND EXCHANGE
     COMMISSION. THIS PROSPECTUS IS NEITHER AN OFFER TO SELL NOR A SOLICITATION
     OF AN OFFER TO BUY THESE SECURITIES IN ANY JURISDICTION WHERE SUCH OFFER OR
     SALE IS UNLAWFUL.
 
                   SUBJECT TO COMPLETION DATED JULY   , 1998
PROSPECTUS
 
                               25,956,661 SHARES
 
                         EQUITY OFFICE PROPERTIES TRUST
                      COMMON SHARES OF BENEFICIAL INTEREST
                            ------------------------
 
     This Prospectus relates to the offer and sale from time to time by certain
holders (the "Selling Shareholders"), of up to 25,956,661 of our common shares
of beneficial interest, $.01 par value per share (the "Offered Shares"). Four of
the Selling Shareholders, owning 13,120,722 Offered Shares in the aggregate,
received their Offered Shares in connection with our acquisition of certain of
their assets or in exchange for cash paid to the Company. We may issue 5,000,000
Offered Shares to a Selling Shareholder upon its exercise of 5,000,000 warrants
to purchase our common shares of beneficial interest, $.01 par value per share
("Common Shares"). We may issue the remaining 7,835,939 Offered Shares to
Selling Shareholders holding up to 7,835,939 units of limited partnership
interest in EOP Operating Limited Partnership ("Units"), if and to the extent
that such Selling Shareholders redeem their Units and we issue them Common
Shares in exchange therefor. We are registering the Offered Shares as required
under the terms of certain agreements between the Selling Shareholders and us.
The registration of the Offered Shares does not necessarily mean that any of the
Offered Shares will be offered or sold by the Selling Shareholders. We will
receive no proceeds of any sales of the Offered Shares, but will incur expenses
in connection with the offering. See "Selling Shareholders" and "Plan of
Distribution."
 
     Our common shares of beneficial interest, par value $.01 per share (the
"Common Shares"), are listed on the New York Stock Exchange (the "NYSE") under
the symbol "EOP."
                            ------------------------
 
     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OF THESE OFFERED SHARES, OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. IT IS ILLEGAL FOR ANY PERSON TO TELL YOU
OTHERWISE.
                            ------------------------
 
     The Selling Shareholders may from time to time offer and sell all or a
portion of the Offered Shares in transactions on the NYSE, in the
over-the-counter market, on any other national securities exchange on which the
Common Shares are listed or traded, in negotiated transactions or otherwise, at
prices then prevailing or related to the then-current market price or at
negotiated prices. The Offered Shares may be sold directly or through agents or
broker-dealers acting as principal or agent, or in block trades or pursuant to a
distribution by one or more underwriters on a firm commitment or best-efforts
basis. To the extent required, the names of any agents or broker-dealers and
applicable commissions or discounts and any other required information with
respect to any particular offer will be set forth in this Prospectus under the
caption "Plan of Distribution" or any accompanying Prospectus Supplement. The
Selling Shareholders reserve the right to accept or reject, in whole or in part,
any proposed purchase of the Offered Shares to be made directly or through
agents. The Selling Shareholders and any agents or broker-dealers participating
in the distribution of the Offered Shares may be deemed to be "underwriters"
within the meaning of the Securities Act of 1933, as amended (the "Securities
Act"), and any profit on the sale of Offered Shares by the Selling Shareholders
and any commissions received by any such agents or broker-dealers may be deemed
to be underwriting commissions or discounts under the Securities Act.
                            ------------------------
 
                 The date of this Prospectus is July   , 1998.
<PAGE>   3
 
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
     Information contained in or incorporated by reference into this Prospectus
and any accompanying Prospectus Supplement contains "forward-looking statements"
within the meaning of Section 27A of the Securities Act. We intend the
forward-looking statements to be covered by the safe harbor provisions for
forward-looking statements contained in Section 27A of the Securities Act. These
forward-looking statements relate to, without limitation, future economic
performance, our plans and objectives for future operations and projections of
revenue and other financial items, which can be identified by the use of
forward-looking terminology such as "may," "will," "should," "expect,"
"anticipate," "estimate" or "continue" or the negative thereof or other
variations thereon or comparable terminology. The cautionary statements
incorporated by reference from our 1997 Annual Report on Form 10-K under the
caption "Risk Factors" and other similar statements contained in this Prospectus
or any accompanying Prospectus Supplement identify important factors with
respect to such forward-looking statements, including certain risks and
uncertainties, that could cause actual results to differ materially from those
in such forward-looking statements.
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, is required to file reports, proxy statements and other information
with the Securities and Exchange Commission (the "Commission"). Such reports,
proxy statements and other information can be inspected and copied at the Public
Reference Section of the Commission at Room 1024, 450 Fifth Street, N.W.,
Washington, D.C. 20549, and at the Commission's regional offices at Citicorp
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and 7 World
Trade Center, Suite 1300, New York, New York 10048. Copies of the reports, proxy
statements and other information can be obtained from the Public Reference
Section of the Commission, Washington, D.C. 20549, upon payment of prescribed
rates, or in certain cases by accessing the Commission's World Wide Web site at
http://www.sec.gov. The public may obtain information on the operation of the
Public Reference Room by calling the Commission at 1-800-SEC-0330. The Common
Shares are listed on the NYSE under the symbol "EOP" and the Series A Preferred
Shares are listed on the NYSE under the symbol "EOPpfA." Such reports, proxy
statements and other information concerning the Company can be inspected at the
offices of the NYSE, 20 Broad Street, New York, New York 10005.
 
     The Company has filed with the Commission a registration statement on Form
S-3 (the "Registration Statement"), of which this Prospectus is a part, under
the Securities Act, with respect to the securities offered hereby. This
Prospectus does not contain all of the 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 contents of any contract or other document are not necessarily complete, and
in each instance, reference is made to the copy of such contract or 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
thereto. For further information regarding the Company and the Offered Shares,
reference is hereby made to the Registration Statement and such exhibits and
schedules which may be obtained from the Commission at its principal office in
Washington, D.C. upon payment of the fees prescribed by the Commission. The
Commission maintains a "web site" that contains reports, proxy and information
statements and other information regarding issuers that file electronically with
the Commission. The address of such site is "http://www.sec.gov."
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The documents listed below have been filed by the Company under the
Exchange Act with the Commission and are incorporated herein by reference:
 
     a. The Company's Annual Report on Form 10-K for the year ended December 31,
        1997, as amended to date.
 
     b. The Company's Quarterly Report on Form 10-Q for the quarter ended March
        31, 1998.
                                        2
<PAGE>   4
 
     c. The Company's Current Report on Form 8-K/A, filed with the Commission on
        February 18, 1998 (amending the Company's Current Report on Form 8-K
        filed with the Commission on December 17, 1997) and the Company's
        Current Reports on Form 8-K, filed with the Commission on June 30, 1998
        and July 10, 1998.
 
     d. The Company's Registration Statement on Form 8-A, which incorporates by
        reference a description of the Common Shares from the Company's
        Registration Statement on Form S-11 (File No. 333-26629).
 
     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering of all securities to which this Prospectus
relates shall be deemed to be incorporated by reference in this Prospectus and
to be a part hereof from the date of filing such documents.
 
     Any statement contained herein or in a document incorporated or deemed to
be incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained in the
Prospectus (in the case of a statement in a previously filed document
incorporated or deemed to be incorporated by reference herein), in any
applicable Prospectus Supplement or in any other subsequently filed document
which also is or is deemed to be incorporated by reference herein modifies or
supersedes such statement. Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Prospectus or any accompanying Prospectus Supplement. Subject to the foregoing,
all information appearing in this Prospectus and each accompanying Prospectus
Supplement is qualified in its entirety by the information appearing in the
documents incorporated by reference.
 
     Copies of all documents which are incorporated herein by reference (not
including the exhibits to such information, unless such exhibits are
specifically incorporated by reference in such information) will be provided
without charge to each person, including any beneficial owner, to whom this
Prospectus is delivered upon written or oral request. Requests should be
directed to Equity Office Properties Trust, Two North Riverside Plaza, Suite
2200, Chicago, Illinois 60606, Attention: Diane Morefield (telephone number:
(312) 466-3300).
 
                                        3
<PAGE>   5
 
     As used herein and in any accompanying Prospectus Supplement, "Company"
means Equity Office Properties Trust, a Maryland real estate investment trust,
and one or more of its subsidiaries (including EOP Operating Limited
Partnership, a Delaware limited partnership (the "Operating Partnership")), and
predecessors thereof (the "Equity Office Predecessors") or, as the context may
require, Equity Office Properties Trust only or the Operating Partnership only.
All references to the historical activities of the Company prior to July 11,
1997, refer to the activities of the Equity Office Predecessors.
 
                                  THE COMPANY
 
     The Company was formed to continue and expand the national office property
business organized by Samuel Zell, chairman of the Board of Trustees of the
Company. The Company, a self-administered and self-managed real estate
investment trust, is the managing general partner of the Operating Partnership.
The Company owns all of its assets and conducts substantially all of its
business through the Operating Partnership and its subsidiaries.
 
     The Company's executive offices are located at Two North Riverside Plaza,
Suite 2200, Chicago, Illinois 60606, and its telephone number is (312) 466-3300.
 
                           NO PROCEEDS TO THE COMPANY
 
     The Company will not receive any of the proceeds from sales of Offered
Shares by the Selling Shareholders. All costs and expenses incurred in
connection with the registration under the Securities Act of the offering made
hereby will be paid by the Company, other than any brokerage fees and
commissions, fees and disbursements of legal counsel for the Selling
Shareholders and share transfer and other taxes attributable to the sale of the
Offered Shares, which will be paid by the Selling Shareholders.
 
                              SELLING SHAREHOLDERS
 
     Four of the Selling Shareholders, owning 13,120,722 Offered Shares in the
aggregate, received their Offered Shares in connection with the Company's
acquisition of certain of their assets or in exchange for cash paid to the
Company. The Company may issue 5,000,000 Offered Shares to a Selling Shareholder
upon its exercise of 5,000,000 warrants to purchase Common Shares. The Company
may issue the remaining 7,835,939 Offered Shares to Selling Shareholders holding
up to 7,835,939 Units, if and to the extent that such Selling Shareholders
redeem their Units and we issue them Common Shares in exchange therefor. The
following table provides the name of each Selling Shareholder, the number of
Common Shares owned by each Selling Shareholder before the offering to which
this Prospectus relates, and the number of Offered Shares offered by each
Selling Shareholder. The extent to which the Offered Shares offered by a Selling
Shareholder represent Common Shares that may be issued by the Company upon the
exercise of the Selling Shareholder's warrants or the redemption of the Selling
Shareholder's Units is indicated in the footnotes to the table below. Since the
Selling Shareholders may sell all or some of their Offered Shares, no estimate
can be made of the number of Offered Shares that will be sold by the Selling
Shareholders or that will be owned by the Selling Shareholders upon completion
of the offering. There is no assurance that the Selling Shareholders will sell
any of the
 
                                        4
<PAGE>   6
 
Offered Shares. The Offered Shares represent approximately 9.22% of the total
Common Shares (assuming redemption of all outstanding Units for Common Shares)
outstanding as of June 30, 1998.
 
<TABLE>
<CAPTION>
                                                                   NUMBER OF
                                                                SHARES OWNED AND
                NAME OF SELLING SHAREHOLDER                      OFFERED HEREBY
                ---------------------------                     ----------------
<S>                                                             <C>
First Plaza Group Trust, through Mellon Bank, N.A., as
  Trustee...................................................        6,785,688(1)
Stichting Pensionenfonds ABP................................        6,666,667
Strategic Value Investors, L.L.C............................        4,650,145(2)
Wright Runstad Holdings Limited Partnership.................        3,536,909(3)
Columbus America Properties, L.L.C..........................        1,692,546(4)
Wright Runstad Asset Management, L.P........................          728,791(5)
Strategic Value Investors International, L.L.C..............          646,793
The Prudential Insurance Company of America.................          621,429(4)
David A. Gardner............................................          290,311(4)
Donald J. Resnick...........................................          290,300(4)
Mark D. Quigley.............................................           43,714(4)
1560 Broadway Partnership...................................            1,684(4)
Galbreath-Denver Limited Partnership........................            1,684(4)
                                                                   ----------
  Total.....................................................       25,956,661
                                                                   ==========
</TABLE>
 
- ---------------
(1) Includes 3,350,000 Common Shares that may be issued by the Company upon the
    exercise of warrants to purchase Common Shares.
 
(2) Includes 2,278,571 Common Shares that may be issued by the Company upon the
    redemption of Units for Common Shares.
 
(3) Includes 1,368,099 Common Shares that may be issued by the Company upon the
    exercise of warrants to purchase Common Shares and 2,168,810 Common Shares
    that may be issued by the Company upon the redemption of Units for Common
    Shares.
 
(4) Common Shares that may be issued by the Company upon the redemption of Units
    for Common Shares.
 
(5) Includes 281,901 Common Shares that may be issued by the Company upon the
    exercise of warrants to purchase Common Shares and 446,890 Common Shares
    that may be issued by the Company upon the redemption of Units for Common
    Shares.
 
                              PLAN OF DISTRIBUTION
 
     Any of the Selling Shareholders may from time to time, in one or more
transactions, sell all or a portion of the Offered Shares on the NYSE, in the
over-the-counter market, on any other national securities exchange on which the
Common Shares are listed or traded, in negotiated transactions, in underwritten
transactions or otherwise, at prices then prevailing or related to the then
current market price or at negotiated prices. The offering price of the Offered
Shares from time to time will be determined by the Selling Shareholders and, at
the time of such determination, may be higher or lower than the market price of
the Common Shares on the NYSE. In connection with an underwritten offering,
underwriters or agents may receive compensation in the form of discounts,
concessions or commissions from a Selling Shareholder or from purchasers of
Offered Shares for whom they may act as agents, and underwriters may sell
Offered Shares to or through dealers, and such dealers may receive compensation
in the form of discounts, concessions or commissions from the underwriters
and/or commissions from the purchasers for whom they may act as agents. Under
agreements that may be entered into by the Company, underwriters, dealers and
agents who participate in the distribution of Offered Shares may be entitled to
indemnification by the Company against certain liabilities, including
liabilities under the Securities Act, or to contribution with respect to
payments which such underwriters, dealers or agents may be required to make in
respect thereof. The Offered Shares may be sold directly or through
broker-dealers acting as principal or agent, or pursuant to a distribution by
one or more underwriters on a firm commitment or best-efforts basis. The methods
by which the Offered Shares may be sold include:
                                        5
<PAGE>   7
 
(a) a block trade in which the broker-dealer so engaged will attempt to sell the
Offered Shares as agent but may position and resell a portion of the block as
principal to facilitate the transaction; (b) purchases by a broker-dealer as
principal and resale by such broker-dealer for its account pursuant to this
Prospectus; (c) ordinary brokerage transactions and transactions in which the
broker solicits purchasers; (d) an exchange distribution in accordance with the
rules of the NYSE; (e) privately negotiated transactions; and (f) underwritten
transactions. The Selling Shareholders and any underwriters, dealers or agents
participating in the distribution of the Offered Shares may be deemed to be
"underwriters" within the meaning of the Securities Act, and any profit on the
sale of the Offered Shares by the Selling Shareholders and any commissions
received by an such broker-dealers may be deemed to be underwriting commissions
under the Securities Act.
 
     When a Selling Shareholder elects to make a particular offer of Offered
Shares, a prospectus supplement, if required, will be distributed which will
identify any underwriters, dealers or agents and any discounts, commissions and
other terms constituting compensation from such Selling Shareholder and any
other required information.
 
     In order to comply with the securities laws of certain states, if
applicable, the Offered Shares may be sold only through registered or licensed
brokers or dealers. In addition, in certain states, the Offered Shares may not
be sold unless they have been registered or qualified for sale in such state or
an exemption from such registration or qualification requirement is available
and is complied with.
 
     The Company has agreed to pay all costs and expenses incurred in connection
with the registration under the Securities Act of the Offered Shares, including,
without limitation, all registration and filing fees, printing expenses and fees
and disbursements of counsel and accountants for the Company. The Selling
Shareholders will pay any brokerage fees and commissions, fees and disbursements
of legal counsel for the Selling Shareholders and stock transfer and other taxes
attributable to the sale of the Offered Shares. The Company also has agreed to
indemnify each of the Selling Shareholders and their respective officers,
directors and trustees and each person who controls (within the meaning of the
Securities Act) such Selling Shareholder against certain losses, claims,
damages, liabilities and expenses arising under the securities laws in
connection with this offering. Each of the Selling Shareholders has agreed to
indemnify the Company, its officers and directors and each person who controls
(within the meaning of the Securities Act) the Company, and each of the other
Selling Shareholders, against any losses, claims, damages, liabilities and
expenses arising under the securities laws in connection with this offering with
respect to written information furnished to the Company by such Selling
Shareholder; provided, however, that the indemnification obligation is several,
not joint, as to each Selling Shareholder.
 
                                    EXPERTS
 
     The consolidated financial statements of Equity Office Properties Trust
appearing in Equity Office Properties Trust's Annual Report (Form 10-K, as
amended by Form 10-K/A) for the year ended December 31, 1997 and the statements
of revenue and certain expenses for the Denver Post Tower, 301 Howard Street and
215 Fremont Street, the Mountain Properties, Millennium Plaza, Polk & Taylor,
Colonnade I, Colonnade II and the Walker Building and Columbia Seafirst Center
appearing in the Current Report of Equity Office Properties Trust on Form 8-K
dated June 26, 1998; have all been audited by Ernst & Young LLP, independent
auditors, as set forth in their reports thereon included therein and
incorporated herein by reference in reliance upon such reports given upon the
authority of such firm as experts in accounting and auditing.
 
     The consolidated financial statements of Beacon Properties Corporation,
appearing in the Current Report on Form 8-K/A of Equity Office Properties Trust
filed with the Commission on February 18, 1998, have been audited by
PricewaterhouseCoopers LLP, independent auditors, as set forth in their reports
included therein and incorporated herein by reference. Such consolidated
financial statements are incorporated herein by reference in reliance upon such
reports given upon the authority of such firm as experts in accounting and
auditing.
 
                                        6
<PAGE>   8
 
                                 LEGAL MATTERS
 
     The legality of the Offered Shares has been passed upon for the Company by
Hogan & Hartson L.L.P., Washington, D.C. Certain tax matters have been passed
upon by Hogan & Hartson L.L.P., Washington, D.C., special tax counsel to the
Company.
 
                                        7
<PAGE>   9
 
- ------------------------------------------------------
- ------------------------------------------------------
 
  NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN
CONNECTION WITH THE OFFERING COVERED BY THIS PROSPECTUS. IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY OR THE SELLING SHAREHOLDERS. THIS PROSPECTUS DOES NOT CONSTITUTE
AN OFFER TO SELL, OR A SOLICITATION OF ANY OFFER TO BUY, THE OFFERED SHARES, IN
ANY JURISDICTION WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE ANY
SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY
OFFER OR 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.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                          PAGE
                                          ----
<S>                                       <C>
Special Note Regarding Forward-Looking
  Statements..........................      2
Available Information.................      2
Incorporation of Certain Documents by
  Reference...........................      2
The Company...........................      4
No Proceeds to the Company............      4
Selling Shareholders..................      4
Plan of Distribution..................      5
Experts...............................      6
Legal Matters.........................      7
</TABLE>
 
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
 
                               25,956,661 SHARES
 
                                 EQUITY OFFICE
                                PROPERTIES TRUST
 
                      COMMON SHARES OF BENEFICIAL INTEREST
 
                            ------------------------
 
                                   PROSPECTUS
                            ------------------------
                                 JULY   , 1998
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   10
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the estimated fees and expenses payable by
the Company in connection with the issuance and distribution of the securities
being registered:
 
<TABLE>
<S>                                                         <C>
Registration Fee........................................    $212,009
Printing and Duplicating Expenses.......................      50,000
Legal Fees and Expenses.................................      50,000
Accounting Fees and Expenses............................      50,000
Miscellaneous...........................................      50,000
                                                            --------
  Total.................................................    $412,009
                                                            ========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Title 8 of the Corporations and Associations Article of the Annotated Code
of Maryland, as amended from time to time (the "Maryland REIT Law"), permits a
Maryland REIT to include in its declaration of trust a provision limiting the
liability of its trustees and officers to the trust and its shareholders for
money damages except for liability resulting from (a) actual receipt of an
improper benefit or profit in money, property or services or (b) active and
deliberate dishonesty established by a final judgment as being material to the
cause of action. The Company's declaration of trust, as amended from time to
time, and as filed with the State Department of Assessments and Taxation of
Maryland (the "Declaration of Trust"), contains such a provision which
eliminates such liability to the maximum extent permitted by the Maryland REIT
law.
 
     The Declaration of Trust authorizes the Company, to the maximum extent
permitted by Maryland law, to obligate itself to indemnify and to pay or
reimburse reasonable expenses in advance of final disposition of a proceeding to
(a) any present or former trustee or officer or (b) any individual who, while a
trustee of the Company and at the request of the company, serves or has served
as a director, officer, partner, trustee, employee or agent of another
corporation, partnership, joint venture, trust, employee benefit plan or any
other enterprise from and against any claim or liability to which such person
may become subject or which such person may incur by reason of his or her status
as a present or former trustee or officer of the Company. The Bylaws obligate
the Company, to the maximum extent permitted by Maryland law, to indemnify and
to pay or reimburse reasonable expenses in advance of final disposition of a
proceeding to (a) any present or former trustee or officer who is made party to
the proceeding by reason of his service in that capacity or (b) any individual
who, while a trustee or officer of the Company and at the request of the
Company, serves or has served another corporation, partnership, joint venture,
trust, employee benefit plan or any other enterprise as a trustee, director,
officer or partner of such corporation, partnership, joint venture, trust,
employee benefit plan or other enterprise and who is made a party to the
proceeding by reason of his service in that capacity, against any claim or
liability to which he may become subject by reason of such status. The
Declaration of Trust and Bylaws also permit the Company to indemnify and advance
expenses to any person who served a predecessor of the Company in any of the
capacities described above and to any employee or agent of the Company or a
predecessor of the Company. The Bylaws require the Company to indemnify a
trustee or officer (or any former trustee or officer) who has been successful,
on the merits or otherwise, in the defense of any proceeding to which he is made
a party by reason of his service in that capacity against reasonable expenses
incurred in connection with the proceeding.
 
     The Maryland REIT Law permits a Maryland REIT to indemnify and advance
expenses to its trustees, officers, employees and agents to the same extent as
permitted by the Maryland General Corporation Law, as amended from time to time
(the "MGCL"), for directors and officers of Maryland corporations. The MGCL
permits a corporation to indemnify its present and former directors and
officers, among others, against judgments, penalties, fines, settlements and
reasonable expenses actually incurred by them in connection with any proceeding
to which they may be made a party by reason of their service in those or other
capacities unless
 
                                      II-1
<PAGE>   11
 
it is established that (a) the act or omission of the director or officer was
material to the matter giving rise to the proceeding and (i) was committed in
bad faith or (ii) was the result of active and deliberate dishonesty, (b) the
director or officer actually received an improper personal benefit in money,
property or services or (c) in the case of any criminal proceeding, the director
or officer had reasonable cause to believe that the act or omission was
unlawful. The foregoing limitations on indemnification are expressly set forth
in the Bylaws. However, under the MGCL, a Maryland corporation may not indemnify
for any adverse judgment in a suit by or in the right of the corporation or for
a judgment of liability on the basis that a personal benefit was improperly
received, unless, in either case, a court orders indemnification and then only
for expenses. Under the MGCL, as a condition to advancing expenses, as required
by the Bylaws, the Company must first receive (a) a written affirmation by the
trustee or officer of his good faith belief that he has met the standard of
conduct necessary for indemnification by the Company and (b) a written
undertaking by or on his behalf to repay the amount paid or reimbursed by the
Company if it shall ultimately be determined that the standard of conduct was
not met. In addition, Mr. Dobrowski will be indemnified by General Motors
Investment Management Corporation ("GMIMCO") and will be covered by an insurance
policy maintained by General Motors Corporation, of which GMIMCO is a
subsidiary, in connection with serving on the Board.
 
     The limited partnership agreement of the Operating Partnership (the
"Partnership Agreement") also provides for indemnification of the Company and
its officers and trustees to the same extent that indemnification is provided to
officers and trustee of the Company in its Declaration of Trust, and limits the
liability of the Company and its officers and trustees to the Operating
Partnership and its respective partners to the same extent that the Declaration
of Trust limits the liability of the officers and trustees of the Company to the
Company and its shareholders.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to trustees, officers or persons controlling the Company
pursuant to the foregoing provisions, the Company has been informed that in the
opinion of the Commission such indemnification is against public policy as
expressed in the Act and is therefore unenforceable.
 
ITEM 16. EXHIBITS
 
<TABLE>
         <S>        <C>
         5.1*       Opinion of Hogan & Hartson L.L.P. regarding the legality of
                    the securities being registered.
         8.1        Opinion of Hogan & Hartson L.L.P. regarding certain tax
                    matters.
         23.1*      Consent of Hogan & Hartson L.L.P. (included as part of
                    Exhibit 5.1)
         23.2       Consent of Hogan & Hartson L.L.P. (included as part of
                    Exhibit 8.1)
         23.3       Consent of Ernst & Young LLP
         23.4       Consent of PricewaterhouseCoopers LLP
         24.1       Power of Attorney (included in signature page)
</TABLE>
 
- ---------------
* To be filed by amendment.
 
ITEM 17. UNDERTAKINGS
 
(a) The undersigned Registrant hereby undertakes:
 
     (1)  To file, during any period in which offers or sales are being made, a
          post-effective amendment to this registration statement:
 
        (i)   To include any prospectus required by Section 10(a)(3) of the
              Securities Act of 1933;
 
        (ii)  To reflect in the prospectus any facts or events arising after the
              effective date of the registration statement (or the most recent
              post-effective amendment thereof) which, individually or in the
              aggregate, represent a fundamental change in the information set
              forth in this registration statement. Notwithstanding the
              foregoing, any increase or decrease in volume of securities
              offered (if the total dollar value of securities offered would not
              exceed that which
 
                                      II-2
<PAGE>   12
 
             was registered) and any deviation from the low or high end of the
             estimated maximum offering range may be reflected in the form of
             prospectus filed with the Commission pursuant to Rule 424(b) if, in
             the aggregate, the changes in volume and price represent no more
             than a 20 percent change in the maximum aggregate offering price
             set forth in the "Calculation of Registration Fee" table in the
             effective registration statement; and
 
       (iii) To include any material information with respect to the plan of
             distribution not previously disclosed in the registration
             statement or any material change to such information in this
             registration statement;
 
provided, however, that subparagraphs (i) and (ii) above shall not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in the periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or Section 15(d) of the
Securities Exchange Act of 1934 that are incorporated by reference in this
registration statement.
 
     (2)  That, for the purpose of determining any liability under the
          Securities Act of 1933, each such post-effective amendment shall be
          deemed to be a new registration statement relating to the Securities
          offered herein, and the offering of such Securities at that time shall
          be deemed to be the initial bona fide offering thereof.
 
     (3)  To remove from registration by means of a post-effective amendment any
          of the Securities being registered which remain unsold at the
          termination of the offering.
 
(b) The undersigned Registrant hereby further undertakes that, for the purposes
    of determining any liability under the Securities Act of 1933, each filing
    of the Registrant's annual report pursuant to Section 13(a) or Section 15(d)
    of the Securities Exchange Act of 1934 that is incorporated by reference in
    this registration statement shall be deemed to be a new registration
    statement relating to the Securities offered herein, and the offering of
    such Securities at that time shall be deemed to be the initial bona fide
    offering thereof.
 
(c) Insofar as indemnification for liabilities arising under the Securities Act
    of 1933 may be permitted to directors, officers and controlling persons of
    the Registrant pursuant to existing provisions or arrangements whereby the
    Registrant may indemnify a director, officer or controlling person of the
    Registrant against liabilities arising under the Securities Act of 1933, 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 of 1933 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 of 1933 and will be governed by the final adjudication of
    such issue.
 
                                      II-3
<PAGE>   13
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in Chicago, Illinois, on this 14th day of July, 1998.
 
                                          EQUITY OFFICE PROPERTIES TRUST
 
                                          By:    /s/ TIMOTHY H. CALLAHAN
                                            ------------------------------------
                                                    Timothy H. Callahan
                                               President and Chief Executive
                                                           Officer
 
                               POWER OF ATTORNEY
 
     We, the undersigned trustees and officers of Equity Office Properties
Trust, do hereby constitute and appoint Samuel Zell and Timothy H. Callahan and
each and either of them, our true and lawful attorneys-in-fact and agents, to do
any and all acts and things in our names and our behalf in our capacities as
trustees and officers and to execute any and all instruments for us and in our
name in the capacities indicated below, which said attorneys and agents, or
either of them, may deem necessary or advisable to enable said Trust to comply
with the Securities Act of 1933 and any rules, regulations and requirements of
the Securities and Exchange Commission, in connection with this registration
statement, or any registration statement for this offering that is to be
effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933,
including specifically, but without limitation, any and all amendments
(including post-effective amendments) hereto; and we hereby ratify and confirm
all that said attorneys and agents, or either of them, shall do or cause to be
done by virtue thereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated as of the 14th day of July, 1998.
 
<TABLE>
<CAPTION>
                     SIGNATURE                                                TITLE
                     ---------                                                -----
<S>                                                       <C>
/s/ TIMOTHY H. CALLAHAN                                   President, Chief Executive Officer and Trustee
- ---------------------------------------------------       (principal executive officer)
Timothy H. Callahan
 
/s/ RICHARD D. KINCAID                                    Chief Financial Officer (principal financial
- ---------------------------------------------------       officer and principal accounting officer)
Richard D. Kincaid
 
/s/ SAMUEL ZELL
- ---------------------------------------------------       Chairman of the Board of Trustees
Samuel Zell
 
/s/ SHELI Z. ROSENBERG
- ---------------------------------------------------       Trustee
Sheli Z. Rosenberg
 
/s/ THOMAS E. DOBROWSKI
- ---------------------------------------------------       Trustee
Thomas E. Dobrowski
 
/s/ JAMES D. HARPER, JR.
- ---------------------------------------------------       Trustee
James D. Harper, Jr.
</TABLE>
 
                                      II-4
<PAGE>   14
 
<TABLE>
<CAPTION>
                     SIGNATURE                                                TITLE
                     ---------                                                -----
<S>                                                       <C>
/s/ PETER LINNEMAN
- ---------------------------------------------------       Trustee
Peter Linneman
 
- ---------------------------------------------------       Trustee
Jerry M. Reinsdorf
 
/s/ WILLIAM M. GOODYEAR
- ---------------------------------------------------       Trustee
William M. Goodyear
 
/s/ DAVID K. MCKOWN
- ---------------------------------------------------       Trustee
David K. McKown
 
/s/ H. JON RUNSTAD
- ---------------------------------------------------       Trustee
H. Jon Runstad
 
/s/ EDWIN N. SIDMAN
- ---------------------------------------------------       Trustee
Edwin N. Sidman
 
/s/ D. J. A. DE BOCK
- ---------------------------------------------------       Trustee
D. J. A. de Bock
</TABLE>
 
                                      II-5
<PAGE>   15
 
                               INDEX TO EXHIBITS
 
<TABLE>
         <S>        <C>
 
                    Opinion of Hogan & Hartson L.L.P. regarding the legality of
         5.1*       the securities being registered.
                    Opinion of Hogan & Hartson L.L.P. regarding certain tax
         8.1        matters.
                    Consent of Hogan & Hartson L.L.P. (included as part of
         23.1*      Exhibit 5.1)
                    Consent of Hogan & Hartson L.L.P. (included as part of
         23.2       Exhibit 8.1)
         23.3       Consent of Ernst & Young LLP
         23.4       Consent of PricewaterhouseCoopers LLP
         24.1       Power of Attorney (included in signature page)
</TABLE>
 
- ---------------
* To be filed by amendment.
 
                                      II-6

<PAGE>   1


                                July 14, 1998


Equity Office Properties Trust
Two North Riverside Plaza
Chicago, Illinois  60606

Ladies and Gentlemen:

     We have acted as special tax counsel to Equity Office Properties Trust
(the "Company"), a Maryland real estate investment trust, in connection with
the registration by the Company of up to 25,956,661 common shares of beneficial
interest, par value $.01 per share, (the "Offered Shares") which may be offered
and sold from time to time by certain holders (the "Selling Shareholders"), as
more fully described in the Company's Registration Statement on Form S-3 filed
with the Securities and Exchange Commission on or about the date hereof (the
"Registration Statement," which includes the "Prospectus").  In connection with
such registration, we have been asked to provide you with an opinion regarding
certain federal income tax matters related to the Company.  Unless otherwise
defined herein or the context hereof otherwise requires, each term used herein
with initial capitalized letters has the meaning given to such term in the
Prospectus.

BASES FOR OPINIONS

     The opinions set forth in this letter are based on relevant current
provisions of the Internal Revenue Code of 1986, as amended (the "Code"),
Treasury Regulations thereunder (including proposed and temporary Treasury
Regulations), and interpretations of the foregoing as expressed in court
decisions, legislative history, and administrative determinations of the
Internal Revenue Service (the "IRS") (including its practices and policies in
issuing private letter rulings, which are not binding on the IRS, except with
respect to a taxpayer that receives such a ruling), all as of the date hereof.
These provisions and interpretations are subject to changes, which may or may
not be retroactive in effect, that might result in material modifications of
our opinions.  Our opinion does not foreclose the possibility of a contrary
determination by the IRS or a court of competent jurisdiction or of a contrary
position by the IRS or the Treasury Department in regulations or rulings issued
in the future.  In this regard, although we believe that 





<PAGE>   2

Equity Office Properties Trust
July 14, 1998
Page 2


our opinions set forth herein will be sustained if challenged, an opinion of    
counsel with respect to an issue is not binding on the IRS or the courts, and
is not a guarantee that the IRS will not assert a contrary position with
respect to such issue or that a court will not sustain such a position asserted
by the IRS.

     In rendering the following opinions, we have examined such statutes,
regulations, records, certificates and other documents as we have considered
necessary or appropriate as a basis for such opinions, including the following:
(1) the Prospectus; (2) the Amended and Restated Agreement of Limited
Partnership of the Operating Partnership, dated as of July 3, 1997, as amended
to the date hereof; (3) the Articles of Amendment and Restatement of
Declaration of Trust of the Company dated as of July 8, 1997, as amended to the
date hereof (the "Declaration of Trust") and, with respect to each series of
Preferred Shares of the Company, the Articles Supplementary establishing and
fixing the rights and preferences of such series of preferred shares; (4) the
agreements of limited partnership, as amended to the date hereof, of each of
the Opportunity Partnerships; (5) the form of partnership agreement or limited
liability company operating agreement, as applicable, used by Operating
Partnership and/or the Opportunity Partnerships to organize and operate the
partnerships and limited liability companies in which one or more of the
Opportunity Partnerships owns an interest (collectively, the "Partnership
Subsidiaries"); (6) the articles of organization and stock ownership records of
each corporation in which one or more of the Operating Partnership or the
Opportunity Partnerships owns stock, directly or indirectly, including
BeaMetFed, Inc., Equity Office Properties Management Corp., EOP Office Company,
Beacon Properties Management Corporation, Beacon Design Corporation and Beacon
Construction Company, Inc. (collectively, the "Corporate Entities"); (7) stock
ownership information for Tenant Services Corp.; and (8) other necessary
documents as we have deemed necessary in order to render the opinions set forth
in this letter.  The opinions set forth in this letter also are premised on
certain written representations of (i) each of the ZML REITs and each of the
Opportunity Partnerships contained in a letter to us dated July 7, 1997, which
letter was reconfirmed to us by the Company, as the successor to the ZML REITs,
as of the date hereof, regarding the assets, operations and activities of each
of the ZML REITs prior to July 11, 1997 and (ii) the Company and the Operating
Partnership contained in a letter to us dated as of the date hereof, regarding
the assets, operations and activities of the Company and the Operating
Partnership in the past and as to the contemplated assets, operations and
activities of the Company in the future (collectively, the "Management
Representation Letters").






<PAGE>   3

Equity Office Properties Trust
July 14, 1998
Page 3



     For purposes of rendering our opinion, we have not made an independent
investigation or audit of the facts set forth in any of the above-referenced
documents, including the Management Representation Letters.  We consequently
have relied upon representations in the Management Representation Letters that
the information presented in such documents or otherwise furnished to us is
accurate and complete in all material respects.  We are not, however, aware of
any material facts or circumstances contrary to, or inconsistent with, the
representations we have relied upon as described herein or other assumptions
set forth herein.

     Moreover, we have assumed that, insofar as relevant to the opinions set
forth herein, (1) each of the Company, the Operating Partnership, the
Opportunity Partnerships, the Partnership Subsidiaries, and the Corporate
Entities in which an Opportunity Partnership owns an interest has been and will
be operated in the manner described in the Prospectus and in the relevant
partnership agreement, articles (or certificate) of incorporation, declaration
of trust or other organizational documents; (2) as represented by the Company,
there are no agreements or understandings between (a) the Company or the
Operating Partnership and (b) either (i) Equity Office Holdings L.L.C., the
entity that owns 100% of the voting stock of Equity Office Properties
Management Corp. and EOP Office Company, or with such corporations themselves,
that are inconsistent, or will be inconsistent, with Equity Office Holdings
L.L.C. being considered to be both the record and beneficial owner of 100% of
the outstanding voting stock of Equity Office Properties Management Corp. and
EOP Office Company, or (ii) Equity Office Properties Management Corp., the
entity that owns 100% of the voting stock of Beacon Properties Management
Corporation, Beacon Design Corporation, and Beacon Construction Company, Inc.,
or with such corporations themselves that are inconsistent or will be
inconsistent, with Equity Office Properties Management Corp. being considered
to be both the record and beneficial owner of 100% of the outstanding voting
stock of each of Beacon Properties Management Corporation, Beacon Design
Corporation, and Beacon Construction Company, Inc.; (3) as represented by the
Company, the Company will take measures to ensure that any services provided to
tenants of the Properties by Tenant Services Corp. will be considered "usually
or customarily rendered" and any other services provided to the tenants of the
Properties will be either "usually or customarily rendered" or provided by an
entity that qualifies as an "independent contractor" as defined in Section 856
of the Code and the Treasury Regulations thereunder; and (4) the Company is a
validly organized and duly incorporated real estate investment trust under the
laws of the State of Maryland, each of the Corporate Entities is a validly







<PAGE>   4

Equity Office Properties Trust
July 14, 1998
Page 4



organized and duly incorporated corporation under the laws of the state in
which it is purported to be organized, Operating Partnership is a duly
organized and validly existing limited partnership under the laws of the State
of Delaware, each of the Opportunity Partnerships is a duly organized and
validly existing limited partnership under the laws of the State of Illinois,
and each of the Partnership Subsidiaries is a duly organized and validly
existing partnership or limited liability company, as the case may be, under
the applicable laws of the state in which it is purported to be organized.

     In our review, we have assumed that all of the representations and
statements set forth in the documents that we reviewed (including the
Management Representation Letters) are true and correct, and all of the
obligations imposed by any such documents on the parties thereto, including
obligations imposed under the Declaration of Trust, have been and will continue
to be performed or satisfied in accordance with their terms.  We also have
assumed the genuineness of all signatures, the proper execution of all
documents, the authenticity of all documents submitted to us as originals, the
conformity to originals of documents submitted to us as copies, and the
authenticity of the originals from which any copies were made.

OPINIONS

     Based upon, subject to, and limited by the assumptions and qualifications
set forth herein, we are of the opinion that:

     1. the Company is organized, as of the date hereof, in conformity with the
requirements for qualification and taxation as a real estate investment trust
("REIT") under the Code, and the Company's proposed method of operation (as
described in the Prospectus and the Management Representation Letters) will
enable the Company to continue to meet the requirements for qualification and
taxation as a REIT for the taxable year ending December 31, 1998, and for
subsequent taxable years; and

     2. the discussion in the Company's Annual Report on Form 10-K, as amended,
for the fiscal year ended December 31, 1997, as incorporated by reference in
the Prospectus, under the caption "Federal Income Tax Considerations," to the
extent that it discusses matters of law or legal conclusions or purports to
describe certain provisions of the federal tax laws, is a correct summary of
the matters discussed therein as of the date hereof.






<PAGE>   5
Equity Office Properties Trust
July 14, 1998
Page 5



     We assume no obligation to advise you of any changes in our opinion or of
any new developments in the application or interpretation of the federal income
tax laws subsequent to the date of this letter.  The Company's qualification
and taxation as a REIT depend upon both (i) the satisfaction in the past by
Beacon and the ZML REITs of the requirements for qualification and taxation as
a REIT; (ii) the Company's ability to meet on a continuing basis, through
actual annual operating and other results, the various requirements under the
Code, as described in the Prospectus with regard to, among other things, the
sources of its gross income, the composition of its assets, the level of its
distributions to shareholders, and the diversity of its stock ownership; and
(iii) the satisfaction, at all time since the Company has owned an interest in
BeaMetFed, Inc. and on a continuing basis, by BeaMetFed, Inc. of the
requirements for qualification and taxation as a REIT.  Hogan & Hartson L.L.P.
will not review the Company's compliance with these requirements on a
continuing basis.  Accordingly, no assurance can be given that the actual
results of the Company's operations, the sources of its income, the nature of
its assets, the level of its distributions to shareholders and the diversity of
its share ownership for any given taxable year will satisfy the requirements
under the Code for qualification and taxation as a REIT.

     In rendering the opinions herein, Hogan & Hartson L.L.P. has relied upon
representations of the Company and the Operating Partnership with respect to
REIT qualification matters, including those set forth in the Management
Representation Letters.  In addition, Hogan & Hartson L.L.P. has relied upon
the representations of the Company and the Operating Partnership regarding the
qualification of BeaMetFed, Inc. as a REIT.

     This letter has been prepared solely for your use in connection with the
filing of the Registration Statement and should not be quoted in whole or in
part or otherwise referred to, or be filed with or furnished to any
governmental agency or other person, without the prior written consent of this
firm.  We hereby consent to the filing of this opinion letter as Exhibit 8.1 to
the Registration Statement and to the reference to Hogan & Hartson L.L.P. under
the caption "Legal Matters" in the Prospectus.  In giving this consent, we do
not thereby admit that we are an "expert" within the meaning of the Securities
Act of 1933, as amended.

                                                 Very truly yours,


                                                 Hogan & Hartson L.L.P.



<PAGE>   1
                                                                  EXHIBIT 23.3


We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of Equity Office
Properties Trust for the registration of 25,956,661 common shares of beneficial
interest and to the incorporation by reference therein of our reports indicated
below with respect to the financial statements indicated below included in 
Equity Office Properties Trust's filings as indicated below, with the 
Securities and Exchange Commission.



        Financial Statements                         Date of Auditors Report
        --------------------                         -----------------------

Consolidated financial statements of Equity         February 23, 1998, except
Office Properties Trust included in its Annual      for Note 25, as to which the
Report (Form 10-K, as amended by Form 10-K/A)       date is March 18, 1998
for the year ended December 31, 1997


The following reports are included in the 
Current Report of Equity Office Properties 
Trust on Form 8-K dated June 26, 1998:

Statement of Revenue and Certain Expenses of 
Denver Post Tower for the year ended 
December 31, 1997                                   April 28, 1998

Combined Statement of Revenue and Certain 
Expenses 301 Howard Street and 215 Fremont 
Street for the year ended October 31, 1997          April 29, 1998

Combined Statement of Revenue and Certain 
Expenses of the Mountain Properties for the 
year ended December 31, 1997                        April 28, 1998

Statement of Revenue and Certain Expenses of
Millennium Plaza for the year ended 
December 31, 1997                                   June 22, 1998

Statement of Revenue and Certain Expenses of 
Polk & Taylor for the year ended 
December 31, 1997                                   June 18, 1998

Combined Statement of Revenue and Certain 
Expenses of Colonnade I, Colonnade II, and the 
Walker Building for the year ended 
December 31, 1997                                   June 12, 1998

Statement of Revenue and Certain Expenses of 
Columbia Seafirst Center for the year ended
December 31, 1997                                   July 1, 1998



Chicago Illinois                                    /s/ Ernst & Young LLP
July 13, 1998                                       ---------------------
                                                        Ernst & Young LLP


<PAGE>   1
                                                                   EXHIBIT 23.4


                      CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in this Registration Statement of
Equity Office Properties Trust on Form S-3 of our reports dated January 28,
1997, on our audits of the financial statements and financial statement
schedules of Beacon Properties Corporation, which reports were filed with the
Securities and Exchange Commission on the Form 8-K/A of Equity Office
Properties Trust on February 18, 1998. We also consent to the reference to our
firm under the caption "Experts."


                                            /s/ PricewaterhouseCoopers LLP

                                                PRICEWATERHOUSECOOPERS LLP


Boston, Massachusetts
July 13, 1998



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