EOP OPERATING LTD PARTNERSHIP
8-K, 1999-04-19
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



Date of Report (Date of earliest event reported):  APRIL 13, 1999



                        EOP OPERATING LIMITED PARTNERSHIP
             (Exact name of registrant as specified in its charter)



          DELAWARE                    1-13625                  36-4156801
(State or other jurisdiction   (Commission File Number)       (IRS Employer
      of incorporation)                                   Identification Number)



2 NORTH RIVERSIDE PLAZA
SUITE 2200
CHICAGO, ILLINOIS                                                  60606
(Address of principal executive offices)                         (Zip Code)



Registrant's telephone number, including area code:  (312) 466-3300



                                 NOT APPLICABLE
          (Former name or former address, if changed since last report)



<PAGE>   2


                         EQUITY OFFICE PROPERTIES TRUST

ITEM 5   -   OTHER EVENTS

Attached as Exhibits to this form are the documents listed below:

   Exhibit                 Document
   -------                 --------

    1.1                    Underwriting Agreement dated April 13, 1999, by and 
                           among EOP Operating Limited Partnership and Merrill
                           Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith
                           Incorporated, as representative of the several
                           underwriters listed on Schedule A thereto.

    4.23                   $200,000,000 7.5% Notes due 2029.

    5.1                    Opinion of Hogan & Hartson L.L.P. regarding the 
                           legality of the Notes.














                                      -2-
<PAGE>   3

                                    SIGNATURE


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                      EOP OPERATING LIMITED PARTNERSHIP



                                      By:   Equity Office Properties, its
                                            Managing General Partner





Date:  April 16, 1999                 By:   /s/ Stanley M. Stevens
                                            ----------------------
                                            Stanley M. Stevens
                                            Executive Vice President and
                                            Secretary












                                      -3-

<PAGE>   4

                                  EXHIBIT INDEX


 Exhibit                   Document
 -------                   --------

   1.1                     Underwriting Agreement dated April 13, 1999, by and 
                           among EOP Operating Limited Partnership and Merrill
                           Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith
                           Incorporated, as representative of the several
                           underwriters listed on Schedule A thereto.

   4.23                    $200,000,000 7.5% Notes due 2029.

   5.1                     Opinion of Hogan & Hartson L.L.P. regarding the 
                           legality of the Notes.










<PAGE>   1
                                                                     EXHIBIT 1.1
 
                       EOP OPERATING LIMITED PARTNERSHIP
                        (a Delaware limited partnership)

                                  $200,000,000

                          7.5% Notes due April 19, 2029



                             UNDERWRITING AGREEMENT


                                                                 April 13, 1999


MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
            INCORPORATED
on behalf of the Underwriters listed on Schedule A hereof

c/o MERRILL LYNCH, PIERCE, FENNER & SMITH
                INCORPORATED
     World Financial Center
     North Tower
     New York, New York 10281-1209

Dear Ladies and Gentlemen:

         EOP Operating Limited Partnership, a Delaware limited partnership (the
"Operating Partnership"), confirms its agreement with Merrill Lynch & Co.,
Merrill Lynch, Pierce, Fenner & Smith Incorporated ("Merrill Lynch") on behalf
of the Underwriters listed on Schedule A hereto (collectively, the
"Underwriters," which term shall also include any underwriter substituted as
provided in Section 10 hereof), for whom Merrill Lynch is acting as
representative (in such capacity, the "Representative"), with respect to the
sale by the Operating Partnership and the purchase by the Underwriters, acting
severally and not jointly, of $200,000,000 aggregate principal amount of 7.5%
Notes due April 19, 2029 (the "Securities"). The Securities will be issued
pursuant to an indenture dated as of September 2, 1997 (such indenture, as
supplemented, the "Indenture"), between the Operating Partnership and State
Street Bank and Trust Company, as trustee (the "Trustee"). The Securities will
be issued in book-entry form only to Cede & Co. as nominee of The Depository
Trust Company ("DTC") pursuant to a letter agreement, to be dated as of the
Closing Time (as defined in Section 2(c)) (the "DTC Agreement"), among the
Operating Partnership, the Trustee and DTC. Unless the context otherwise
requires, as used herein, "you" and "your" shall mean the parties to whom this
Underwriting Agreement (this "Agreement") is addressed. Capitalized terms used
herein without definition shall have the meanings assigned to such terms in the
Prospectus (as defined below) relating to the Securities.


<PAGE>   2

                  The Operating Partnership understands that the Underwriters
propose to make a public offering of the Securities as soon as the
Representative deems advisable after this Agreement has been executed.

                  The Operating Partnership has filed with the Securities and
Exchange Commission (the "Commission") a registration statement on Form S-3 (No.
333-58689) covering the registration of debt securities, including the
Securities, under the Securities Act of 1933, as amended (the "1933 Act"),
including the related preliminary prospectus or prospectuses. Promptly after
execution and delivery of this Agreement, the Operating Partnership will prepare
and file a prospectus supplement relating to the Securities in accordance with
the provisions of Rule 424(b) ("Rule 424(b)") of the rules and regulations of
the Commission under the 1933 Act (the "1933 Act Regulations"). Any prospectus
supplement relating to the Securities that omitted certain pricing information
and was used after the effectiveness of such registration statement and prior to
the execution and delivery of this Agreement and the prospectus contained in
such registration statement are collectively referred to as herein as a
"preliminary prospectus." Such registration statement, including the exhibits
thereto, schedules thereto, if any, and the documents incorporated by reference
therein pursuant to Item 12 of Form S-3 under the 1933 Act, at the time it
became effective, is herein called the "Registration Statement." Any
registration statement filed pursuant to Rule 462(b) of the 1933 Act Regulations
is herein referred to as the "Rule 462(b) Registration Statement," and after
such filing the term "Registration Statement" shall include the Rule 462(b)
Registration Statement. The final prospectus and the prospectus supplement
relating to the Securities, including the documents incorporated by reference
therein pursuant to Item 12 of Form S-3 under the 1933 Act, in the form first
furnished to the Underwriters for use in connection with confirming sales of the
Securities, are collectively referred to herein as the "Prospectus." For
purposes of this Agreement, all references to the Registration Statement, any
preliminary prospectus or the Prospectus or any amendment or supplement to any
of the foregoing shall be deemed to include the copy filed with the Commission
pursuant to its Electronic Data Gathering, Analysis and Retrieval system
("EDGAR").

                  All references in this Agreement to financial statements and
schedules and other information which is "contained," "included," "set forth" or
"stated" in the Registration Statement, any preliminary prospectus or the
Prospectus (or other references of like import) shall be deemed to mean and
include all such financial statements and schedules and other information which
is incorporated by reference in the Registration Statement, any preliminary
prospectus or the Prospectus, as the case may be; and all references in this
Agreement to amendments or supplements to the Registration Statement, any
preliminary prospectus or the Prospectus shall be deemed to mean and include the
filing of any document under the Securities Exchange Act of 1934, as amended
(the "1934 Act"), which is incorporated by reference in the Registration
Statement, such preliminary prospectus or the Prospectus, as the case may be.

                  The "Company" shall mean Equity Office Properties Trust, a
Maryland real estate investment trust, which is the managing general partner of
the Operating Partnership.

                                       2

<PAGE>   3
                  Section 1.   Representations and Warranties of the Operating 
Partnership.

                  (a) The Operating Partnership represents and warrants to each
Underwriter as of the date hereof and as of the Closing Time, and agrees with
each Underwriter, as follows:

                                    (i) Compliance with Registration
                  Requirements. The Operating Partnership meets the requirements
                  for use of Form S-3 under the 1933 Act. The Registration
                  Statement, including any Rule 462(b) Registration Statement,
                  has become effective under the 1933 Act and no stop order
                  suspending the effectiveness of the Registration Statement has
                  been issued under the 1933 Act and no proceedings for that
                  purpose have been instituted or are pending or, to the
                  knowledge of the Operating Partnership, are contemplated by
                  the Commission, and any request on the part of the Commission
                  for additional information has been complied with.

                                    At the respective times the Registration
                  Statement and any post-effective amendments thereto became
                  effective and at the Closing Time, the Registration Statement
                  and any amendments thereto complied and will comply in all
                  material respects with the requirements of the 1933 Act and
                  the 1933 Act Regulations and the Trust Indenture Act of 1939,
                  as amended (the "1939 Act") and the rules and regulations of
                  the Commission under the 1939 Act (the "1939 Act
                  Regulations"), and did not and will not contain 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 not misleading. Neither the Prospectus nor
                  any amendments or supplements thereto, at the time the
                  Prospectus or any such amendment or supplement was issued and
                  at the Closing Time, included or will include an untrue
                  statement of a material fact or omitted or will omit to state
                  a material fact necessary in order to make the statements
                  therein, in the light of the circumstances under which they
                  were made, not misleading. The representations and warranties
                  in this subsection shall not apply to statements in or
                  omissions from the Registration Statement or Prospectus made
                  in reliance upon and in conformity with information furnished
                  to the Operating Partnership in writing by any Underwriter
                  through the Representative expressly for use in the
                  Registration Statement or Prospectus.

                                    Each preliminary prospectus and the
                  prospectus filed as part of the Registration Statement as
                  originally filed or as part of any amendment thereto, or filed
                  pursuant to Rule 424 under the 1933 Act Regulations, complied
                  when so filed in all material respects with the 1933 Act
                  Regulations, and each preliminary prospectus and the
                  Prospectus delivered to the Underwriters for use in connection
                  with this offering was identical to the electronically
                  transmitted copies thereof filed with the Commission pursuant
                  to EDGAR, except to the extent permitted by Regulation S-T.

                                    (ii) Incorporated Documents. The documents
                  incorporated or deemed to be incorporated by reference in the
                  Registration Statement and the 


                                       3

<PAGE>   4


                  Prospectus, when they became effective or at the time they
                  were or hereafter are filed with the Commission, complied and
                  will comply in all material respects with the requirements of
                  the 1933 Act and the 1933 Act Regulations or the 1934 Act and
                  the rules and regulations of the Commission thereunder (the
                  "1934 Act Regulations"), as applicable, and, when read
                  together with the other information in the Prospectus, at the
                  time the Registration Statement became effective, at the time
                  the Prospectus was issued and at the Closing Time, did not and
                  will not include an untrue statement of a material fact or
                  omit to state a material fact necessary in order to make the
                  statements therein, in the light of the circumstances under
                  which they were made, not misleading.

                                    (iii) Independent Accountants. Ernst & Young
                  LLP, the accounting firm that certified the financial
                  statements and supporting schedules included in the
                  Registration Statement, is an independent public accountant as
                  required by the 1933 Act and the 1933 Act Regulations.

                                    (iv) Financial Statements. The financial
                  statements included in the Registration Statement and the
                  Prospectus, together with the related schedules and notes,
                  present fairly the financial position of the respective entity
                  or entities presented therein at the respective dates
                  indicated and the results of their operations for the
                  respective periods specified, and except as otherwise stated
                  therein, said financial statements have been prepared in
                  conformity with generally accepted accounting principles
                  ("GAAP") applied on a consistent basis. The supporting
                  schedules included in the Registration Statement present
                  fairly in accordance with GAAP the information required to be
                  stated therein. The financial information and data included in
                  the Prospectus present fairly the information included therein
                  and have been prepared on a basis consistent with that of the
                  books and records of the respective entities presented
                  therein. The Statements of Revenues and Certain Operating
                  Expenses included in the Prospectus for certain of the
                  Properties (as defined below) present fairly the information
                  included therein and have been prepared on a basis consistent
                  with that of the books and records of the respective entities
                  presented therein. Pro forma financial information included in
                  the Registration Statement and the Prospectus has been
                  prepared in accordance with the applicable requirements of
                  Rules 11-01 and 11-02 of Regulation S-X under the 1933 Act,
                  and the necessary pro forma adjustments have been properly
                  applied to the historical amounts in the compilation of such
                  information, and, in the opinion of the Operating Partnership,
                  the assumptions used in the preparation thereof are reasonable
                  and the adjustments used therein are appropriate to give
                  effect to the transactions and circumstances referred to
                  therein.

                                    (v) No Material Adverse Change. Since the
                  respective dates as of which information is given in the
                  Registration Statement and the Prospectus, except as otherwise
                  stated therein, (A) there has been no material adverse change
                  in the condition, financial or otherwise, or in the earnings,
                  assets, or business affairs of the Operating Partnership and
                  its subsidiaries considered as one

                                       4

<PAGE>   5


                  enterprise, whether or not arising in the ordinary course of
                  business (a "Material Adverse Change"), (B) no casualty loss
                  or condemnation or other adverse event with respect to any
                  Property has occurred that would result in a Material Adverse
                  Effect (as defined below), (C) there have been no transactions
                  or acquisitions entered into by the Operating Partnership or
                  any of its subsidiaries, other than those arising in the
                  ordinary course of business, which are material with respect
                  to the Operating Partnership and its subsidiaries considered
                  as one enterprise, (D) except as described in the Registration
                  Statement and the Prospectus and except for regular quarterly
                  distributions on the partnership interests of the Operating
                  Partnership, there has been no distribution of any kind
                  declared, paid or made by the Operating Partnership with
                  respect to its partnership interests, and (E) there has been
                  no material change in the partnership interests of the
                  Operating Partnership, or any material increase in the
                  indebtedness of the Operating Partnership.

                                    (vi) Good Standing of the Operating
                  Partnership. The Operating Partnership has been duly formed
                  and is validly existing as a limited partnership in good
                  standing under the Delaware Revised Uniform Limited
                  Partnership Act (the "Delaware Act") with partnership power
                  and authority to own, lease and operate any real property or
                  improvements thereon owned or leased by the Operating
                  Partnership or its subsidiaries (each individually, a
                  "Property" and collectively, the "Properties"), to conduct the
                  business in which it is engaged or proposes to engage as
                  described in the Registration Statement and the Prospectus and
                  to enter into and perform its obligations under or
                  contemplated under this Agreement. The Operating Partnership
                  is duly qualified or registered as a foreign partnership and
                  is in good standing in each jurisdiction in which such
                  qualification or registration is required, whether by reason
                  of the ownership or leasing of property or the conduct of
                  business, except where the failure to so qualify, register or
                  be in good standing would not result in a material adverse
                  effect on the condition, financial or otherwise, or the
                  earnings, assets, business affairs or business prospects of
                  the Operating Partnership and the its subsidiaries considered
                  as one enterprise (a "Material Adverse Effect").

                                    (vii) Good Standing of the Subsidiaries.
                  Each of the subsidiaries of the Operating Partnership listed
                  on Schedule C to this Agreement (collectively, the
                  "Significant Subsidiaries"), if any, has been duly organized
                  and is validly existing as a partnership, corporation, limited
                  liability company or real estate investment trust in good
                  standing under the laws of its respective jurisdiction of
                  organization, with all power and authority to own, lease and
                  operate its Properties and to conduct the business in which it
                  is engaged or proposes to engage as described in the
                  Registration Statement and the Prospectus. Each of the
                  subsidiaries of the Operating Partnership is duly qualified or
                  registered as a foreign partnership, corporation, limited
                  liability company, or real estate investment trust and is in
                  good standing in each jurisdiction in which the business
                  conducted by such subsidiary is required and permitted,
                  whether by reason of the ownership or leasing of property or
                  the conduct of business, except where the failure, singly or


                                       5
<PAGE>   6


                  in the aggregate, to so qualify would not result in a Material
                  Adverse Effect. Each of the partnership or operating
                  agreements of the Significant Subsidiaries is in full force
                  and effect.

                                    (viii) Capitalization of Operating
                  Partnership. The capitalization of the Operating Partnership
                  is as set forth in the Prospectus as of the date referenced
                  therein. All of the partnership interests outstanding at the
                  date hereof were duly authorized for issuance by the Operating
                  Partnership and are validly issued and fully paid. The
                  outstanding partnership interests were offered and sold in
                  compliance with all applicable laws (including, without
                  limitation, federal and state securities laws).

                                    (ix) Authorization of the Indenture. The
                  Indenture has been duly authorized, executed and delivered by
                  the Operating Partnership, and assuming due authorization,
                  execution and delivery by the Trustee, constitutes a valid and
                  binding obligation of the Operating Partnership, enforceable
                  against the Operating Partnership in accordance with its
                  terms, except as (i) the enforceability thereof may be limited
                  by bankruptcy, insolvency, reorganization, moratorium or
                  similar laws affecting creditors' rights generally and (ii)
                  rights of acceleration and the availability of equitable
                  remedies may be limited by equitable principles of general
                  applicability.

                                    (x) Authorization of the Securities. The
                  Securities have been duly authorized by the Operating
                  Partnership and, at the Closing Time, will have been duly
                  executed by the Operating Partnership and, when authenticated,
                  issued and delivered in the manner provided for in the
                  Indenture and delivered against payment of the purchase price
                  therefor as provided in this Agreement, will constitute valid
                  and binding obligations of the Operating Partnership,
                  enforceable against the Operating Partnership in accordance
                  with their terms, except as (i) the enforceability thereof may
                  be limited by bankruptcy, insolvency, reorganization,
                  moratorium or similar laws affecting creditors' rights
                  generally and (ii) rights of acceleration and the availability
                  of equitable remedies may be limited by equitable principles
                  of general applicability, and the Securities will be in the
                  form contemplated by, and entitled to the benefits of, the
                  Indenture.

                                    (xi) Description of the Securities and the
                  Indenture. The Securities and the Indenture will conform in
                  all material respects to the respective statements relating
                  thereto contained in the Prospectus and will be in
                  substantially the respective forms filed or incorporated by
                  reference, as the case may be, as exhibits to the Registration
                  Statement.

                                    (xii) Absence of Defaults. Neither the
                  Operating Partnership nor any Significant Subsidiary is in
                  violation of its declaration of trust, charter, by-laws,
                  limited liability company agreement, certificate of limited
                  partnership or partnership agreement, as the case may be, and
                  neither the Operating Partnership nor any Significant
                  Subsidiary is in default in the performance or observance of
                  any 




                                       6
<PAGE>   7


                  obligation, agreement, covenant or condition contained in any
                  contract, indenture, mortgage, loan agreement, note, lease or
                  other instrument to which such entity is a party or by which
                  such entity may be bound, or to which any of the property or
                  assets of such entity is subject, except where a default
                  thereunder would not result in a Material Adverse Effect.

                                    (xiii) Absence of Conflicts. The execution
                  and delivery of this Agreement and the Indenture, the
                  performance of the obligations set forth herein or therein,
                  and the consummation of the transactions contemplated hereby
                  or thereby or in the Prospectus (including the issuance and
                  sale of the Securities by the Operating Partnership) will not
                  result in the creation of any lien, charge or encumbrance upon
                  the Properties or conflict with or constitute a breach or
                  violation by the Operating Partnership or any of its
                  subsidiaries, or default under, (A) any material contract,
                  indenture, mortgage, loan agreement, note, lease, joint
                  venture or partnership agreement or other instrument or
                  agreement to which such entity is a party or by which they,
                  any of them, any of their respective assets or any Property
                  may be bound or subject, (B) the declaration of trust, the
                  charter, by-laws, certificate of limited partnership,
                  partnership agreement, or limited liability company agreement,
                  as the case may be, of such entity or (C) any applicable law,
                  rule, order, administrative regulation or administrative or
                  court decree, except in the cases of clauses (A) and (C) for
                  such liens, charges, encumbrances, conflicts, breaches,
                  violations or defaults as would not result in a Material
                  Adverse Effect.

                                    (xiv) Authorization of Agreement. The
                  Operating Partnership has the requisite power and authority
                  under its organizational documents to enter into this
                  Agreement, and this Agreement has been duly authorized,
                  executed and delivered by the Operating Partnership.

                                    (xv) Absence of Proceedings. There is no
                  action, suit or proceeding before or brought by any court or
                  governmental agency or body, domestic or foreign, now pending,
                  or, to the knowledge of the Operating Partnership, threatened
                  against or affecting the Operating Partnership, the Company,
                  any Significant Subsidiary, any Property or any officer or
                  trustee of the Company that, if determined adversely to the
                  Operating Partnership, the Company, any Significant
                  Subsidiary, any Property or any such officer or trustee, might
                  (A) result in any Material Adverse Effect or (B) materially
                  and adversely affect the consummation of the transactions
                  contemplated by this Agreement. There are no legal or
                  governmental proceedings pending or, to the knowledge of the
                  Operating Partnership, threatened to which the Operating
                  Partnership or any significant subsidiary is a party or to
                  which any of their respective assets, properties or operations
                  is the subject that are required to be described in the
                  Prospectus that are not so described. The aggregate of all
                  pending legal or governmental proceedings to which the
                  Operating Partnership, the Company or any Significant
                  Subsidiary is a party or of which any of their respective
                  assets, properties or operations is the subject which are not
                  described in the Prospectus, including ordinary routine



                                       7
<PAGE>   8


                  litigation incidental to the business, could not reasonably be
                  expected to result in a Material Adverse Effect.

                                    (xvi) Accuracy of Exhibits. There are no
                  contracts or documents which are required to be described in
                  the Registration Statement, the Prospectus or the documents
                  incorporated by reference therein or to be filed as exhibits
                  thereto which have not been so described and filed as
                  required.

                                    (xvii) Investment Company Act. Neither the
                  Operating Partnership nor any Significant Subsidiary is, or at
                  the Closing Time will be, required to be registered under the
                  Investment Company Act of 1940, as amended (the "1940 Act").

                                    (xviii) Possession of Intellectual Property.
                  The Operating Partnership and its subsidiaries own or possess,
                  or can acquire on reasonable terms, the trademarks, service
                  marks, trade names, or other intellectual property
                  (collectively, "Intellectual Property") necessary to carry on
                  the business now operated by them, and no such entity has
                  received any notice or is otherwise aware of any infringement
                  of or conflict with asserted rights of others with respect to
                  any Intellectual Property or of any facts or circumstances
                  which would render any Intellectual Property invalid or
                  inadequate to protect the interest of such entities therein,
                  and which infringement or conflict (if the subject of any
                  unfavorable decision, ruling or finding) or invalidity or
                  inadequacy, singly or in the aggregate, would result in a
                  Material Adverse Effect.

                                    (xix) Absence of Further Requirements. All
                  authorizations, approvals and consents of any court or
                  governmental authority or agency that are necessary in
                  connection with the offering, issuance or sale of the
                  Securities hereunder or the consummation of the other
                  transactions contemplated by this Agreement or the Indenture
                  have been obtained, except such as have been already obtained
                  or as may be required under the securities, blue sky or real
                  estate syndication laws of various states in connection with
                  such offer, issuance and sale.

                                    (xx) Possession of Licenses and Permits. The
                  Operating Partnership and its subsidiaries possess such
                  permits, licenses, approvals, consents and other
                  authorizations (collectively, "Governmental Licenses") issued
                  by the appropriate federal, state, or local regulatory
                  agencies or bodies necessary to conduct the business now
                  conducted by them, or proposed to be conducted by them, as
                  described in the Prospectus, except where the failure to
                  possess any such Governmental License would not have a
                  Material Adverse Effect. The Operating Partnership and its
                  subsidiaries are in compliance with the terms and conditions
                  of all such Governmental Licenses, except where the failure so
                  to comply would not, singly or in the aggregate, result in a
                  Material Adverse Effect. All of the Governmental Licenses are
                  valid and in full force and effect, except where the
                  invalidity of such Governmental Licenses or the failure of
                  such Governmental Licenses to be in full force and effect
                  would not result in a Material Adverse



                                       8
<PAGE>   9


                  Effect. Neither the Operating Partnership nor any of its
                  subsidiaries has received any notice of proceedings relating
                  to the revocation or modification of any such Governmental
                  Licenses which, singly or in the aggregate, if the subject of
                  an unfavorable decision, ruling or finding, would result in a
                  Material Adverse Effect.

                                    (xxi) Absence of Labor Dispute. No labor
                  dispute with the employees of the Operating Partnership or any
                  of its subsidiary exists or, to the knowledge of the Operating
                  Partnership, is imminent, which may reasonably be expected to
                  result in a Material Adverse Effect.

                                    (xxii) Title to Property. (A) With respect
                  to the Properties in which the Operating Partnership owns,
                  directly or indirectly, all of the ownership interest therein,
                  the Operating Partnership or its subsidiaries have good and
                  marketable fee simple title to the land underlying such
                  Properties (or, to the extent described in the Prospectus, a
                  valid leasehold estate in such land) and (except for the
                  Property known as "500 Orange") good and marketable title to
                  the improvements thereon and all other assets that are
                  required for the effective operation of such Properties in the
                  manner in which they currently are operated, subject, however,
                  to existing mortgages on such Properties, to utility easements
                  serving such Properties, to liens of ad valorem taxes not due
                  and payable as of the Closing Time (or which are being
                  contested pursuant to applicable law), to zoning and similar
                  governmental land use matters affecting such Properties that
                  are consistent with the current uses of such Properties, to
                  matters of title not adversely affecting marketability of
                  title to such Properties, other statutory liens not due and
                  payable as of the Closing Time, title matters that may be
                  material in character, amount or extent but which do not
                  materially detract from the value, or interfere with the use,
                  of the Properties or otherwise materially impair the business
                  operations being conducted or proposed to be conducted
                  thereon, tenant leases, service marks and trade names used in
                  connection with such Properties, ground leases and ownership
                  by others of certain items of equipment and other items of
                  personal property that are not material to the conduct of
                  business operations at such Properties; (B) with respect to
                  the Properties in which the Operating Partnership owns,
                  directly or indirectly, less than all of the ownership
                  interest (the "Joint Venture Properties"), the Operating
                  Partnership or its subsidiaries have good and marketable title
                  to such ownership interests and the respective entities owning
                  the Joint Venture Properties have good and marketable title to
                  such interests in the Joint Venture Properties and good and
                  marketable title to the improvements thereon and all other
                  assets that are required for the effective operation of such
                  Properties in the manner in which they currently are operated,
                  subject to the exceptions set forth in clause (A) above; (C)
                  the ground leases under which the applicable subsidiaries of
                  the Operating Partnership lease the land on which certain
                  Properties are located are in full force and effect, and each
                  of such subsidiaries is not in default in respect of any of
                  the terms or provisions of such leases and neither the
                  Operating Partnership nor any such subsidiary has not received
                  notice of the assertion of any claim by anyone adverse to such
                  subsidiaries' rights as lessees under such leases, or
                  affecting or questioning such




                                       9
<PAGE>   10

                  subsidiaries' right to the continued possession or use of the
                  Property under such leases or of a default under such leases;
                  (D) all liens, charges, encumbrances, claims, or restrictions
                  on or affecting any of the Properties and the assets of the
                  Operating Partnership or any of its subsidiaries are disclosed
                  in the Prospectus, subject to the exceptions set forth in
                  clause (A) above; (E) neither any subsidiary of the Operating
                  Partnership nor any tenant of any of the Properties is in
                  default under any of the leases pursuant to which the
                  Operating Partnership or any of its subsidiaries, as lessor,
                  leases its Property (and the Operating Partnership does not
                  know of any event which, but for the passage of time or the
                  giving of notice, or both, would constitute a default under
                  any of such leases) other than such defaults and unmatured
                  events of default that would not result in a Material Adverse
                  Effect; (F) except for such rights of first refusal as may be
                  contained in the agreements related to the Joint Venture
                  Properties, no person has an option or right of first refusal
                  to purchase all or part of any Property or any interest
                  therein; (G) each of the Properties complies with all
                  applicable codes, laws and regulations (including, without
                  limitation, building and zoning codes, laws and regulations
                  and laws relating to access to the Properties), except if and
                  to the extent disclosed in the Prospectus and except for such
                  failures to comply that would not individually or in the
                  aggregate result in a Material Adverse Effect; (H) there is in
                  full force and effect insurance coverages for the assets of
                  the Properties that are commercially reasonable for such types
                  of assets, and neither the Operating Partnership nor any of
                  its subsidiaries has received from any insurance company
                  notice of any material defects or deficiencies affecting the
                  insurability of any such assets (including the Properties);
                  and (I) neither the Operating Partnership nor any of its
                  subsidiaries has any knowledge of any pending or threatened
                  condemnation proceedings, zoning change, or other similar
                  proceeding or action that will in any manner affect the size
                  of, use of, improvements on, construction on or access to the
                  Properties, except such proceedings or actions as are
                  disclosed in the Prospectus or that would not have a Material
                  Adverse Effect.

                                    (xxiii) Environmental Laws. Except as
                  disclosed in the Prospectus or as would not have a Material
                  Adverse Effect: (A) each Property, including, without
                  limitation, the Environment (as defined below) associated with
                  such Property, is free of any Hazardous Substance (as defined
                  below) in violation of any Environmental Law (as defined
                  below) applicable to such Property, except for Hazardous
                  Substances that would not result in a Material Adverse Effect;
                  (B) neither the Operating Partnership nor any of its
                  subsidiaries has during the period of its ownership caused or
                  suffered to occur any Release (as defined below) of any
                  Hazardous Substance into the Environment on, in, under or from
                  any Property in violation of any Environmental Law applicable
                  to such Property, and no condition exists on, in, under or, to
                  the knowledge of the Operating Partnership or any of its
                  subsidiaries adjacent to, any Property that could result in
                  the incurrence of material liabilities or any material
                  violations of any Environmental Law applicable to such
                  Property, or give rise to the imposition of any Lien (as
                  defined below) under any Environmental Law; (C) neither the
                  Operating Partnership nor any of its



                                       10
<PAGE>   11


                  subsidiaries is engaged in or intends to engage in any
                  manufacturing at the Properties that (1) requires the use,
                  handling, transportation, storage, treatment or disposal of
                  any Hazardous Substance (other than cleaning solvents and
                  similar materials and other than insecticides and herbicides
                  that are used in the ordinary course of operating the
                  Properties and in compliance with all applicable Environmental
                  Laws) or (2) requires permits or is otherwise regulated
                  pursuant to any Environmental Law; (D) neither the Operating
                  Partnership nor any of its subsidiaries has received any
                  notice of a claim under or pursuant to any Environmental Law
                  applicable to a Property or under common law pertaining to
                  Hazardous Substances on or originating from any Property; (E)
                  neither the Operating Partnership nor any of its subsidiaries
                  has received any notice from any Governmental Authority (as
                  defined below) claiming any violation of any Environmental Law
                  that is uncured or unremediated as of the date hereof; and (F)
                  no Property is included or, to the knowledge of the Operating
                  Partnership nor any of its subsidiaries, proposed for
                  inclusion on the National Priorities List issued pursuant to
                  CERCLA (as defined below) by the United States Environmental
                  Protection Agency (the "EPA") or on the Comprehensive
                  Environmental Response, Compensation, and Liability
                  Information System database maintained by the EPA, and has not
                  otherwise been identified by the EPA as a potential CERCLA
                  removal, remedial or response site or included or, to the
                  knowledge of the Operating Partnership, proposed for inclusion
                  on, any similar list of potentially contaminated sites
                  pursuant to any other applicable Environmental Law nor has the
                  Operating Partnership nor any of its subsidiaries received any
                  written notice from the EPA or any other Governmental
                  Authority proposing the inclusion of any Property on such
                  list; and (G) there are no underground storage tanks located
                  on or in any Property which have not been disclosed to the
                  Representative.

                                    As used herein, the term "Hazardous
                  Substance" shall include, without limitation, any hazardous
                  substance, hazardous waste, toxic or dangerous substance,
                  pollutant, solid waste or similarly designated materials,
                  including, without limitation, oil, petroleum or any
                  petroleum-derived substance or waste, asbestos or
                  asbestos-containing materials, PCBs, pesticides, explosives,
                  radioactive materials, dioxins, urea formaldehyde insulation
                  or any constituent of any such substance, pollutant or waste,
                  including any such substance, pollutant or waste identified or
                  regulated under any Environmental Law (including, without
                  limitation, materials listed in the United States Department
                  of Transportation Optional Hazardous Material Table, 49 C.F.R.
                  ss. 172.101, as heretofore amended, or in the EPA's List of
                  Hazardous Substances and Reportable Quantities, 40 C.F.R. Part
                  302, as heretofore amended); "Environment" shall mean any
                  surface water, drinking water, ground water, land surface,
                  subsurface strata, river sediment, buildings, structures, and
                  ambient workplace and indoor air; "Environmental Law" shall
                  mean the Comprehensive Environmental Response, Compensation
                  and Liability Act of 1980, as amended (42 U.S.C. ss. 9601 et
                  seq.) ("CERCLA"), the Resource Conservation and Recovery Act
                  of 1976, as amended (42 U.S.C. ss. 6901, et seq.), the Clean
                  Air Act, as amended (42 U.S.C. ss. 7401, et



                                       11
<PAGE>   12


                  seq.), the Clean Water Act, as amended (33 U.S.C. ss. 1251, et
                  seq.), the Toxic Substances Control Act, as amended (15 U.S.C.
                  ss. 2601, et seq.), the Occupational Safety and Health Act of
                  1970, as amended (29 U.S.C. ss. 651, et seq.), the Hazardous
                  Materials Transportation Act, as amended (49 U.S.C. ss. 1801,
                  et seq.), and all other federal, state and local laws,
                  ordinances, regulations, rules, orders, decisions and permits
                  relating to the protection of the environment or of human
                  health from environmental effects; "Governmental Authority"
                  shall mean any federal, state or local governmental office,
                  agency or authority having the duty or authority to
                  promulgate, implement or enforce any Environmental Law; "Lien"
                  shall mean, with respect to any Property, any mortgage, deed
                  of trust, pledge, security interest, lien, encumbrance,
                  penalty, fine, charge, assessment, judgment or other liability
                  in, on or affecting such Property; and "Release" shall mean
                  any spilling, leaking, pumping, pouring, emitting, emptying,
                  discharging, injecting, escaping, leaching, dumping, emanating
                  or disposing of any Hazardous Substance into the Environment,
                  including, without limitation, the abandonment or discard of
                  barrels, containers, tanks (including, without limitation,
                  underground storage tanks) or other receptacles containing or
                  previously containing any Hazardous Substance or any release,
                  emission, discharge or similar term, as those terms are
                  defined or used in any Environmental Law.

                                    (xxiv) Tax Compliance. Each of the Operating
                  Partnership and its subsidiaries has filed all federal, state,
                  and local income tax returns which have been required to be
                  filed and has paid all taxes required to be paid and any other
                  assessment, fine or penalty levied against it, to the extent
                  that any of the foregoing is due and payable, except, in all
                  cases, for any such tax, assessment, fine or penalty that is
                  being contested in good faith, and except in any case in which
                  the failure to so file or pay would not have a Material
                  Adverse Effect.

                                    (xxv) No Price Manipulation. Neither the
                  Operating Partnership nor any of its Significant Subsidiaries,
                  nor any of their directors, officers or controlling persons,
                  has taken or will take, directly or indirectly, any action
                  designed to cause or result under the 1934 Act, or otherwise
                  in, or which has constituted or which reasonably might be
                  expected to constitute, the unlawful stabilization or
                  manipulation of the price of any security of the Operating
                  Partnership to facilitate the sale or resale of the
                  Securities.

                                    (xxvi) Plan Assets. The assets of the
                  Operating Partnership and its subsidiaries do not constitute
                  "plan assets" under the Employee Retirement Income Security
                  Act of 1974, as amended, including the regulations and
                  published interpretations thereof.

                                    (xxvii) Regulations G, T, U and X. None of
                  the transactions contemplated by this Agreement (including,
                  without limitation, the use of the proceeds from the sale of
                  the Securities) will violate or result in a violation of
                  Section 7 of the 1934 Act, or any regulation promulgated
                  thereunder, including,


                                       12
<PAGE>   13

                  without limitation, Regulations G, T, U and X of the Board of
                  Governors of the Federal Reserve System.

                                    (xxviii)Partnership Classification. The
                  Operating Partnership and each of the Significant Subsidiaries
                  that are partnerships are properly classified as partnerships,
                  and not as corporations or as associations taxable as
                  corporations, for federal income tax purposes throughout the
                  period from July 11, 1997 through the date hereof, or, in the
                  case of any Significant Subsidiary partnerships that have
                  terminated, through the date of termination of such
                  Significant Subsidiary partnerships.

                                    (xxix) Cross Defaults. The mortgages and
                  deeds of trust encumbering the properties and assets described
                  in general in the Prospectus are not convertible and are not
                  cross-defaulted or cross-collateralized to any property not
                  owned by the Operating Partnership or any of its subsidiaries;
                  and, except as disclosed in the Prospectus, neither the
                  Operating Partnership nor any of its subsidiaries holds
                  participating interests in such mortgages and deeds of trust.

                  (b) Any certificate signed by any officer of the Company, on
behalf of the Operating Partnership, and delivered to the Representative or to
counsel for the Underwriters shall be deemed a representation and warranty by
the Operating Partnership to each Underwriter as to the matters covered thereby.


                  Section 2.   Sale and Delivery; Closing.

                  (a) Securities. On the basis of the representations and
warranties herein contained and subject to the terms and conditions set forth
herein, the Operating Partnership agrees to sell to each Underwriter, severally
and not jointly, and each Underwriter, severally and not jointly, agrees to
purchase from the Operating Partnership, at the price set forth in Schedule B,
the aggregate principal amount of Securities set forth in Schedule A opposite
the name of such Underwriter, plus any additional principal amount of Securities
which such Underwriter may become obligated to purchase pursuant to the
provisions of Section 10 hereof.

                  (b) Payment. Payment of the purchase price for, and delivery
of certificates for, the Securities shall be made at the offices of Brown & Wood
LLP, One World Trade Center, New York, New York 10048-0557, or at such other
place as shall be agreed upon by the Representative and the Operating
Partnership, at 9:00 A.M. (New York City time) on the third business day after
the date hereof (unless postponed in accordance with the provisions of Section
10), or such other time not later than ten business days after such date as
shall be agreed upon by the Representative and the Operating Partnership (such
time and date of payment and delivery being herein called "Closing Time").

                  Payment shall be made to the Operating Partnership by wire
transfer of immediately available funds to a bank account designated by the
Operating Partnership, against delivery to the Representative for the respective
accounts of the Underwriters of certificates for the Securities to be purchased
by them. It is understood that each Underwriter has authorized the




                                       13
<PAGE>   14


Representative, for its account, to accept delivery of, receipt for, and make
payment of the purchase price for, the Securities which it has agreed to
purchase. Merrill Lynch, individually and not as representative of the
Underwriters, may (but shall not be obligated to) make payment of the purchase
price for the Securities to be purchased by any Underwriter whose funds have not
been received by the Closing Time, but such payment shall not relieve such
Underwriter from its obligations hereunder.

                  (c) Denominations; Registration. The Securities shall be in
book-entry form only and shall be represented by global certificates in such
denominations and registered in such names as the Representative may request in
writing at least two full business days before the Closing Time. The Securities
will be made available for examination and packaging by the Representative in
The City of New York not later than 10:00 A.M. (New York City time) on the
business day prior to the Closing Time.


                  Section 3. Covenants of the Operating Partnership. The 
Operating Partnership covenants with each Underwriter as follows:

                  (a) Compliance with Securities Regulations and Commission
Requests. During the period when the Prospectus is required by the 1933 Act to
be delivered in connection with sales of the Securities, the Operating
Partnership will notify the Representative immediately, and confirm the notice
in writing, (i) when any post-effective amendment to the Registration Statement
shall become effective, or any amendment or supplement to the Prospectus shall
have been filed, (ii) of the receipt of any comments from the Commission, (iii)
of any request by the Commission for any amendment to the Registration Statement
or any amendment or supplement to the Prospectus or for additional information,
and (iv) of the issuance by the Commission of any stop order suspending the
effectiveness of the Registration Statement or of any order preventing or
suspending the use of any preliminary prospectus, or of the suspension of the
qualification of the Securities for offering or sale in any jurisdiction, or of
the initiation or threatening of any proceedings for any of such purposes. The
Operating Partnership will promptly effect the filings necessary pursuant to
Rule 424(b) and will take such steps as it deems necessary to ascertain promptly
whether the form of prospectus transmitted for filing under Rule 424(b) was
received for filing by the Commission and, in the event that it was not, it will
promptly file such prospectus. The Company will make every reasonable effort to
prevent the issuance of any stop order and, if any stop order is issued, to
obtain the lifting thereof at the earliest possible moment.

                  (b) Filing of Amendments. During the period when the
Prospectus is required by the 1933 Act to be delivered in connection with sales
of the Securities, the Operating Partnership will give the Representative notice
of its intention to file or prepare any amendment to the Registration Statement
(including any filing under Rule 462(b)) or any amendment, supplement or
revision to either the prospectus included in the Registration Statement at the
time it became effective or to the Prospectus, whether pursuant to the 1933 Act,
the 1934 Act or otherwise, will furnish the Representative with copies of any
such documents a reasonable amount of time prior to such proposed filing or use,
as the case may be, and will not file or use any such document to which the
Representative or counsel for the Underwriters shall object.



                                       14
<PAGE>   15

                  (c) Delivery of Registration Statements. The Operating
Partnership has furnished or will deliver to the Representative and counsel for
the Underwriters, without charge, conformed copies of the Registration Statement
as originally filed and of each amendment thereto (including exhibits filed
therewith or incorporated by reference therein) and conformed copies of all
consents and certificates of experts, and will also deliver to the
Representative, without charge, a conformed copy of the Registration Statement
as originally filed and of each amendment thereto (without exhibits) for each of
the Underwriters. The copies of the Registration Statement and each amendment
thereto furnished to the Underwriters will be identical to the electronically
transmitted copies thereof filed with the Commission pursuant to EDGAR.

                  (d) Delivery of Prospectuses. The Operating Partnership has
delivered to each Underwriter, without charge, as many copies of each
preliminary prospectus as such Underwriter reasonably requested, and the
Operating Partnership hereby consents to the use of such copies for purposes
permitted by the 1933 Act. The Operating Partnership will furnish to each
Underwriter, without charge, during the period when the Prospectus is required
to be delivered under the 1933 Act or the 1934 Act, such number of copies of the
Prospectus (as amended or supplemented) as such Underwriter may reasonably
request. The Prospectus and any amendments or supplements thereto furnished to
the Underwriters will be identical to the electronically transmitted copies
thereof filed with the Commission pursuant to EDGAR, except to the extent
permitted by Regulation S-T.

                  (e) Continued Compliance with Securities Laws. The Operating
Partnership will comply with the 1933 Act and the 1933 Act Regulations, the 1934
Act and the 1934 Act Regulations and the 1939 Act and the 1939 Act Regulations
so as to permit the completion of the distribution of the Securities as
contemplated in this Agreement and in the Prospectus. If at any time when a
prospectus is required by the 1933 Act to be delivered in connection with sales
of the Securities, any event shall occur or condition shall exist as a result of
which it is necessary, in the opinion of counsel for the Underwriters or for the
Operating Partnership, to amend the Registration Statement or amend or
supplement the Prospectus in order that the Prospectus will not include any
untrue statements of a material fact or omit to state a material fact necessary
in order to make the statements therein not misleading in the light of the
circumstances existing at the time it is delivered to a purchaser, or if it
shall be necessary, in the opinion of such counsel, at any such time to amend
the Registration Statement or amend or supplement the Prospectus in order to
comply with the requirements of the 1933 Act or the 1933 Act Regulations, the
Operating Partnership will promptly prepare and file with the Commission,
subject to Section 3(b), such amendment or supplement as may be necessary to
correct such statement or omission or to make the Registration Statement or the
Prospectus comply with such requirements, and the Operating Partnership will
furnish to the Underwriters such number of copies of such amendment or
supplement as the Underwriters may reasonably request.

                  (f) State Law. The Operating Partnership will use its best
efforts, in cooperation with the Underwriters, to qualify the Securities for
offering and sale under the applicable securities laws of such states and other
jurisdictions, including real estate syndication laws, as the Representative may
designate and to maintain such qualifications in effect for a period of not less
than one year from the later of the effective date of the Registration Statement
and any Rule 462(b) Registration Statement; provided, however, that the
Operating Partnership shall not 





                                       15
<PAGE>   16

be obligated to file any general consent to service of process or to qualify as
a foreign limited partnership or as a dealer in securities in any jurisdiction
in which it is not so qualified or to subject itself to taxation in respect of
doing business in any jurisdiction in which it is not otherwise so subject. In
each jurisdiction in which the Securities have been so qualified, the Operating
Partnership will file such statements and reports as may be required by the laws
of such jurisdiction to continue such qualification in effect for a period of
not less than one year from the effective date of the Registration Statement and
any Rule 462(b) Registration Statement. The Operating Partnership will also
supply the Underwriters with such information as is necessary for the
determination of the legality of the Securities for investment under the laws of
such jurisdictions as the Underwriters may request.

                  (g) Rule 158. The Operating Partnership will timely file such
reports pursuant to the 1934 Act as are necessary in order to make generally
available to its securityholders as soon as practicable an earnings statement
for the purposes of, and to provide the benefits contemplated by, the last
paragraph of Section 11(a) of the 1933 Act.

                  (h) Use of Proceeds. The Operating Partnership will use the
net proceeds received by it from the sale of the Securities in the manner
specified in the Prospectus under "Use of Proceeds."

                  (i) Reporting Requirements. The Operating Partnership, during
the period when the Prospectus is required to be delivered under the 1933 Act or
the 1934 Act, will file all documents required to be filed with the Commission
pursuant to the 1934 Act within the time periods required by the 1934 Act and
the 1934 Act Regulations.

                  (j) DTC. The Operating Partnership shall use its reasonable
best efforts in cooperation with the Underwriters to permit the Securities to be
eligible for clearance and settlement through DTC.

                  (k) Ratings. The Operating Partnership will use its reasonable
best efforts to enable Standard & Poor's Ratings Services ("S&P") and Moody's
Investors Service, Inc. ("Moody's") to provide their respective credit ratings
of the Securities.

                  (l) Notification of Certain Events. Prior to the Closing Time,
the Operating Partnership will notify the Representative in writing immediately
if any event occurs that renders any of the representations and warranties of
the Operating Partnership contained herein inaccurate or incomplete.


                  Section 4.   Payment of Fees and Expenses.

                  (a) Expenses. The Operating Partnership will pay all expenses
incident to the performance of its obligations under this Agreement, including
(i) the preparation and filing of the Registration Statement (including
financial statements and exhibits) as originally filed and of each amendment and
supplement thereto, (ii) the preparation and delivery to the Underwriters of
this Agreement, any Agreement among Underwriters, the Indenture, and such other
documents as may be required in connection with the offering, purchase, sale and
delivery of the Securities,




                                       16
<PAGE>   17

including any global securities, (iii) the preparation, issuance and delivery of
the Securities, including any global Securities, (iv) the fees and disbursements
of the Operating Partnership's counsel, accountants, and other advisors or
agents (including transfer agents and registrars), (v) the qualification of the
Securities under state securities laws and real estate syndication laws in
accordance with the provisions of Section 3(f) hereof, including filing fees and
the reasonable fees and disbursements of counsel for the Underwriters in
connection therewith and in connection with the preparation, printing and
delivery of a blue sky memorandum (the "Blue Sky Memorandum") and any amendment
or supplement thereto, (vi) the printing and delivery to the Underwriters of
copies of each preliminary prospectus and the Prospectus and any amendments or
supplements thereto, (vii) any fees charged by nationally recognized statistical
rating organizations for the rating of the Securities, (viii) the fees and
expenses of the Trustee, including the reasonable fees and disbursements of
counsel for the Trustee, in connection with the Indenture and the Securities,
(ix) all expenses and listing fees incurred in connection with the clearance and
settlement of the Securities through DTC and (x) all expenses and listing fees
incurred in connection with the application to obtain CUSIP numbers for the
Securities.

                  (b) Termination of Agreement. If this Agreement is terminated
by the Representative in accordance with the provisions of Section 5 hereof, the
Operating Partnership shall reimburse the Underwriters for all of their
out-of-pocket expenses, including the reasonable fees and disbursements of
counsel for the Underwriters.


                  Section 5. Conditions of Underwriters' Obligations. The
several obligations of the Underwriters hereunder are subject to the accuracy,
as of the date hereof and as of the Closing Time, of the representations and
warranties of the Operating Partnership contained in Section 1(a) hereof, to the
performance by the Operating Partnership of its covenants and other obligations
hereunder, and to the following further conditions:

                  (a) Effectiveness of Registration Statement. The Registration
Statement, including any Rule 462(b) Registration Statement, has become
effective and at Closing Time no stop order suspending the effectiveness of the
Registration Statement shall have been issued under the 1933 Act or proceedings
therefor initiated or threatened by the Commission, and any request on the part
of the Commission for additional information shall have been complied with to
the reasonable satisfaction of counsel to the Underwriters.

                  (b)       (i) At the Closing Time, you shall have received the
favorable opinion, dated as of the Closing Time, of Hogan & Hartson L.L.P.,
counsel for the Operating Partnership, in form and substance satisfactory to
you, to the effect set forth in Exhibit A hereto.

                            (ii) At the Closing Time, the Representative shall
                   have received the favorable opinion, dated as of the Closing
                   Time, of Brown & Wood LLP, counsel for the Underwriters, with
                   respect to the matters set forth in Items (1) (as to
                   formation, valid existence and good standing only),
                   (3),(4),(5),(6),(7),(8) and (14) of Exhibit A hereto and a
                   statement similar to the statement referred to in the last
                   paragraph of Exhibit A hereto.

                             (iii) At the Closing Time, you shall have received 
                  the favorable opinion, dated as of the Closing Time, of 
                  Rosenberg & Liebentritt, P.C., counsel for the Operating 
                  Partnership, with respect to the foreign qualifications of 
                  the Operating Partnership.


                                       17
<PAGE>   18


                        In giving their opinions required by Section 5(b)(i),
(ii) and (iii), each of Hogan & Hartson L.L.P., Brown & Wood LLP and Rosenberg &
Liebentritt, P.C. may rely, (A) as to all matters of fact, upon certificates and
written statements of officers and employees of and accountants for each of the
Operating Partnership or the Significant Subsidiaries and (B) as to the
qualification and good standing of each of the Operating Partnership or the
Significant Subsidiaries to do business in any state or jurisdiction, upon
certificates of appropriate government officials or opinions of counsel in such
jurisdictions, which opinions shall be in form and substance reasonably
satisfactory to counsel for the Underwriters.

                  (c) At the Closing Time, there shall not have been, since the
respective dates as of which information is given in the Prospectus, any
Material Adverse Change, and you shall have received a certificate of the Chief
Executive Officer and the chief financial or chief accounting officer of the
Company, on behalf of the Operating Partnership, dated as of the Closing Time,
evidencing compliance with the provisions of this subsection (c), stating that
(i) there has been no Material Adverse Change, (ii) the representations and
warranties set forth in Section 1(a) hereof are accurate as though expressly
made at and as of the Closing Time, and (iii) the conditions precedent set forth
in this Section 5 have been satisfied or waived and (iv) no stop order
suspending the effectiveness of the Registration Statement has been issued and
no proceedings for that purpose have been instituted or are pending or, to such
officer's knowledge, are contemplated by the Commission.

                  (d) At the time of execution of this Agreement, you shall have
received from Ernst & Young, LLP a letter dated such date, in form and substance
satisfactory to you, containing statements and information of the type
ordinarily included in accountants' "comfort letters" to underwriters with
respect to the financial statements and certain financial information contained
in the Registration Statement and the Prospectus.

                  (e) At the Closing Time, you shall have received from Ernst &
Young LLP a letter dated as of the Closing Time to the effect that they reaffirm
the statements made in the letter furnished pursuant to subsection (d)(i) of
this Section 5, except that the "specified date" referred to shall be a date not
more than three days prior to the Closing Time. Any exception will be identified
in such letter.

                  (f) At the Closing Time, counsel for the Underwriters shall
have been furnished with such documents and opinions as they may require for the
purpose of enabling them to pass upon the issuance of the Securities as herein
contemplated, or in order to evidence the accuracy of any of the representations
or warranties, or the fulfillment of any of the conditions, herein contained;
and all proceedings taken by the Operating Partnership in connection with the
issuance of the Securities as herein contemplated shall be satisfactory in form
and substance to you and counsel for the Underwriters.

                  (g) At or prior to the Closing Time, the Securities shall be
rated at least Baa1 by Moody's and BBB by S&P and the Operating Partnership
shall have delivered to the Representative evidence reasonably satisfactory to
the Representative confirming that the Securities have such ratings; and since
the date of the Agreement, there shall not have occurred a downgrading in the
rating assigned to the Securities or any of the Operating Partnership's other




                                       18
<PAGE>   19


debt securities or the Company's preferred shares of beneficial interest by any
"nationally recognized statistical rating organization," as that term is defined
by the Commission for purposes of Rule 436(g)(2) under the 1933 Act, and no such
securities rating organization shall have publicly announced that it has under
surveillance or review any rating of the Securities or any of the Operating
Partnership's other debt securities or the Company's preferred shares of
beneficial interest.

                  (h) If any condition specified in this Section 5 shall not
have been fulfilled when and as required to be fulfilled, this Agreement may be
terminated by you by notice to the Operating Partnership at any time at or prior
to the Closing Time, and such termination shall be without liability of any
party to any other party except as provided in Sections 4 and except that
Sections 6, 7, 8 and 13 shall survive any such termination and remain in full
force and effect.


                  Section 6.   Indemnification.

                  (a) Indemnification of Underwriters. The Operating Partnership
agrees to indemnify and hold harmless each Underwriter and each person, if any,
who controls any Underwriter within the meaning of Section 15 of the 1933 Act or
Section 20 of the 1934 Act, and any director, officer, employee or affiliate
thereof, as follows:

                                    (i) against any and all loss, liability,
                  claim, damage and expense whatsoever, as incurred, arising out
                  of any untrue statement or alleged untrue statement of a
                  material fact contained in the Registration Statement (or any
                  amendment thereto), or the omission or alleged omission
                  therefrom of a material fact required to be stated therein or
                  necessary to make the statements therein not misleading or
                  arising out of any untrue statement or alleged untrue
                  statement of a material fact contained in the Prospectus (or
                  any amendment or supplement thereto), or the omission or
                  alleged omission therefrom of a material fact necessary in
                  order to make the statements therein, in the light of the
                  circumstances under which they were made, not misleading;

                                    (ii) against any and all loss, liability,
                  claim, damage and expense whatsoever, as incurred, to the
                  extent of the aggregate amount paid in settlement of any
                  litigation, or any investigation or proceeding by any
                  governmental agency or body, commenced or threatened, or of
                  any claim whatsoever based upon any such untrue statement or
                  omission, or any such alleged untrue statement or omission;
                  provided that (subject to Section 6(d) below) any such
                  settlement is effected with the written consent of the
                  Operating Partnership; and

                                    (iii) against any and all expense whatsoever
                  (including, without limitation, the reasonable fees and
                  disbursements of counsel chosen by the Representative),
                  reasonably incurred in investigating, preparing or defending
                  against any litigation, or any investigation or proceeding by
                  any governmental agency or body, commenced or threatened, or
                  any claim whatsoever based upon any such untrue statement or
                  omission, or any such alleged untrue statement or omission, to
                  the extent that any such expense is not paid under (i) or (ii)
                  above;



                                       19
<PAGE>   20


provided, however, that this indemnity agreement shall not apply to any loss,
liability, claim, damage or expense to the extent arising out of any untrue
statement or omission or alleged untrue statement or omission made in reliance
upon and in conformity with written information furnished to the Operating
Partnership by any Underwriter through the Representative expressly for use in
the Registration Statement (or any amendment thereto), or any preliminary
prospectus or the Prospectus (or any amendment or supplement thereto).

                  (b) Indemnification of the Operating Partnership. Each
Underwriter, severally and not jointly, agrees to indemnify and hold harmless
the Operating Partnership, and each person, if any, who controls the Operating
Partnership within the meaning of Section 15 of the 1933 Act or Section 20 of
the 1934 Act, and any trustee, officer, employee or affiliate thereof, against
any and all loss, liability, claim, damage and expense described in the
indemnity contained in subsection (a) of this Section 6, as incurred, but only
with respect to untrue statements or omissions, or alleged untrue statements or
omissions, made in the Registration Statement (or any amendment thereto) or any
preliminary prospectus or the Prospectus (or any amendment or supplement
thereto) in reliance upon and in conformity with written information concerning
such Underwriter furnished to the Operating Partnership through the
Representative by or on behalf of such Underwriter expressly for use in the
Registration Statement (or any amendment thereto) or such preliminary prospectus
or the Prospectus (or any amendment or supplement thereto).

                  (c) Actions against Parties; Notification. Each indemnified
party shall give notice as promptly as reasonably practicable to each
indemnifying party of any action commenced against it in respect of which
indemnity may be sought hereunder, but failure to so notify an indemnifying
party shall not relieve such indemnifying party from any liability hereunder to
the extent it is not materially prejudiced as a result thereof and in any event
shall not relieve it from any liability which it may have otherwise than on
account of this indemnity agreement. In the case of parties indemnified pursuant
to Section 6(a) above, counsel to the indemnified parties shall be selected by
the Representative, and, in the case of parties indemnified pursuant to Section
6(b) above, counsel to the indemnified parties shall be selected by the
Operating Partnership. An indemnifying party may participate at its own expense
in the defense of any such action; provided, however, that counsel to the
indemnifying party shall not (except with the consent of the indemnified party)
also be counsel to the indemnified party. In no event shall the indemnifying
parties be liable for fees and expenses of more than one counsel (in addition to
any local counsel) separate from their own counsel for all indemnified parties
in connection with any one action or separate but similar or related actions in
the same jurisdiction arising out of the same general allegations or
circumstances. No indemnifying party shall, without the prior written consent of
the indemnified parties, settle or compromise or consent to the entry of any
judgment with respect to any litigation, or any investigation or proceeding by
any governmental agency or body, commenced or threatened, or any claim
whatsoever in respect of which indemnification or contribution could be sought
under this Section 6 or Section 7 hereof (whether or not the indemnified parties
are actual or potential parties thereto), unless such settlement, compromise or
consent (i) includes an unconditional release of each indemnified party from all
liability arising out of such litigation, investigation, proceeding or claim and
(ii) does not include a statement as to or an admission of fault, culpability or
a failure to act by or on behalf of any indemnified party.



                                       20
<PAGE>   21


                  (d) Settlement without Consent if Failure to Reimburse. If at
any time an indemnified party shall have requested an indemnifying party to
reimburse the indemnified party for fees and expenses of counsel, such
indemnifying party agrees that it shall be liable for any settlement of the
nature contemplated by Section 6(a)(iii) effected without its written consent if
(i) such settlement is entered into more than 45 days after receipt by such
indemnifying party of the aforesaid request, (ii) such indemnifying party shall
have received notice of the terms of such settlement at least 30 days prior to
such settlement being entered into and (iii) such indemnifying party shall not
have reimbursed such indemnified party in accordance with such request prior to
the date of such settlement.


                  Section 7. Contribution. In order to provide for just and
equitable contribution in circumstances in which the indemnity agreement
provided for in Section 6 hereof is for any reason held to be unenforceable by
the indemnified parties although applicable in accordance with its terms, the
Operating Partnership, on the one hand, and the Underwriters, on the other,
shall contribute to the aggregate losses, liabilities, claims, damages and
expenses of the nature contemplated by said indemnity agreement incurred by the
Operating Partnership and the Underwriters, as incurred, in such proportions
that the Underwriters are responsible for that portion represented by the
percentage that the discounts and commissions appearing on the cover page of the
Prospectus bears to the price to investors appearing thereon and the Operating
Partnership is responsible for the balance; provided, however, that no person
guilty of fraudulent misrepresentation (within the meaning of section 11(f) of
the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation.

                  For purposes of this Section 7, each person, if any, who
controls an Underwriter within the meaning of Section 15 of the 1933 Act or
Section 20 of the 1934 Act shall have the same rights to contribution as such
Underwriter, and each trustee of the Company, and each person, if any, who
controls the Operating Partnership within the meaning of Section 15 of the 1933
Act or Section 20 of the 1934 Act shall have the same rights to contribution as
the Operating Partnership. The Underwriters' respective obligations to
contribute pursuant to this Section 7 are several in proportion to the principal
amount of Securities set forth opposite their respective names in Schedule A
hereto and not joint.

                  Notwithstanding the provisions of this Section 7, no
Underwriter shall be required to contribute any amount in excess of the amount
by which the total price at which the Securities purchased and sold by it to
purchasers exceeds the amount of any damages which such Underwriter has
otherwise been required to pay by reason of any untrue or alleged untrue
statement or omission or alleged omission in the Prospectus.


                  Section 8. Representations, Warranties and Agreements to
Survive Delivery. All representations, warranties and agreements contained in
this Agreement or in certificates of officers of the Company, on behalf of the
Operating Partnership, submitted pursuant hereto, shall remain operative and in
full force and effect, regardless of any investigation made by or on behalf of
any Underwriters or any controlling person, or by or on behalf of the Operating
Partnership or any controlling person, and shall survive delivery of the
Securities to the Underwriters.



                                       21
<PAGE>   22
                  Section 9.   Termination of Agreement.

                  (a) The Representative may terminate this Agreement, by notice
to the Operating Partnership, at any time at or prior to the Closing Time, (i)
if there has been, since the date of this Agreement or since the respective
dates as of which information is given in the Prospectus, any Material Adverse
Change, (ii) if there has occurred any material adverse change in the financial
markets in the United States or any outbreak of hostilities or escalation
thereof or other calamity or crisis or any change or development involving a
prospective change in national or international political, financial, or
economic conditions, in each case, the effect of which is such as to make it, in
the Representative's reasonable judgment, impracticable to market the Securities
or enforce contracts for the sale of the Securities, (iii) if trading in any of
the Company's shares of beneficial interest or the Operating Partnership's debt
securities has been suspended by the Commission or the New York Stock Exchange,
or if trading generally on the New York Stock Exchange, the American Stock
Exchange or the Nasdaq Stock Market has been suspended, or minimum or maximum
prices for trading have been fixed, or maximum ranges for prices have been
required, by either of said exchanges or by such system or by order of the
Commission, the National Association of Securities Dealers, Inc., or any other
governmental authority, or (iv) if a banking moratorium has been declared by
either federal, New York, Delaware or Maryland authorities.

                  (b) If this Agreement is terminated pursuant to this Section
9, such termination shall be without liability of any party to any other party
except as provided in Sections 4 and 10 hereof and provided further that
Sections 4, 6, 7, 8 and 13 hereof shall survive such termination and remain in
full force and effect.


                  Section 10. Default by One or More of the Underwriters. If one
or more of the Underwriters shall fail at the Closing Time to purchase the
Securities which it or they are obligated to purchase under this Agreement (the
"Defaulted Securities"), the Representative shall have the right, within 24
hours thereafter, to make arrangements for one or more of the non-defaulting
Underwriters, or any other underwriters, to purchase all, but not less than all,
of the Defaulted Securities in such amounts as may be agreed upon and upon the
terms herein set forth; if, however, the Representative shall not have completed
such arrangements within such 24-hour period, then:

                  (a) if the aggregate principal amount of Defaulted Securities
does not exceed 10% of the aggregate principal amount of the Securities to be
purchased hereunder, the non-defaulting Underwriters shall be obligated,
severally and not jointly, to purchase the full amount thereof in the
proportions that their respective purchase obligations hereunder bear to the
purchase obligations of all non-defaulting Underwriters.

                  (b) if the aggregate principal amount of Defaulted Securities
exceeds 10% of the aggregate principal amount of the Securities to be purchased
hereunder, this Agreement shall terminate without liability on the part of any
non-defaulting Underwriter.

                  No action taken pursuant to this Section 10 shall relieve any
defaulting Underwriter from liability in respect of its default.




                                       22
<PAGE>   23

                  In the event of any such default which does not result in a
termination of this Agreement, either the Representative or the Operating
Partnership shall have the right to postpone the Closing Time for a period not
exceeding seven days in order to effect any required changes in the Registration
Statement or Prospectus or in any other documents or arrangements. As used
herein, the term " Underwriter" includes any person substituted for an
Underwriter under this Section 10.


                  Section 11. Notices. All notices and other communications
hereunder shall be in writing and shall be deemed to have been duly given if
mailed or transmitted by any standard form of telecommunication. Notices to the
Underwriters shall be directed to the Representative at World Financial Center,
North Tower, New York, New York 10281-1305, attention of John Brady, Managing
Director; and notices to the Operating Partnership shall be directed to it at
Two North Riverside Plaza, Suite 2200, Chicago, IL 60606, attention of Stanley
M. Stevens, Chief Legal Counsel.


                  Section 12. Parties. This Agreement shall inure to the benefit
of and be binding upon the parties hereto and their respective successors.
Nothing expressed or mentioned in this Agreement is intended or shall be
construed to give any person, firm or corporation, other than the Underwriters
and the Operating Partnership and their respective successors and the
controlling persons and officers and trustees referred to in Sections 6 and 7
and their successors, heirs and legal representatives, any legal or equitable
right, remedy or claim under or in respect of this Agreement or any provision
herein contained. This Agreement and all conditions and provisions hereof are
intended to be for the sole and exclusive benefit of the parties hereto and
their respective successors and said controlling persons and officers and
directors and their successors, heirs and legal representatives, and for the
benefit of no other person, firm or corporation. No purchaser of Securities from
any Underwriter shall be deemed to be a successor by reason merely of such
purchase.


                  Section 13. GOVERNING LAW AND TIME. THIS AGREEMENT SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK
APPLICABLE TO AGREEMENTS MADE AND TO BE PERFORMED IN SAID STATE. SPECIFIED TIMES
OF DAY REFER TO NEW YORK CITY TIME.


                  Section 14.    Counterparts.  This  Agreement  may be 
executed in one or more  counterparts  and, if executed in more than one 
counterpart, the executed counterparts shall constitute a single instrument.


                  Section 15.    Effect of Headings.  The Article, Section 
and Sub-Section  headings  herein are for convenience only and shall not 
affect the construction hereof.

                                    * * * * *



                                       23
<PAGE>   24

                  If the foregoing is in accordance with your understanding of
our agreement please sign and return to the Operating Partnership a counterpart
hereof, whereupon this instrument, along with all counterparts, will become a
binding agreement among the Underwriters and the Operating Partnership in
accordance with its terms.

                                    Very truly yours,


                                    EOP OPERATING LIMITED
                                    PARTNERSHIP

                                    By:  Equity Office Properties Trust
                                         Managing General Partner

                                    By:  /s/ Stanley M. Stevens
                                         -----------------------
                                         Name:    Stanley M. Stevens
                                         Title:   Executive V.P., Secretary and
                                                  Chief Legal Counsel

Confirmed and Accepted, 
as of the date first above written:

MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
            INCORPORATED
For themselves and as the Representative of the
other Underwriters named in Schedule A hereto



By:  John C. Breely
     --------------
     Authorized Signatory






                                       24
<PAGE>   25

                                   SCHEDULE A



                                                        Aggregate Principal 
                    Underwriter                        Amount of Securities
                  ---------------                      --------------------
Merrill Lynch, Pierce, Fenner & Smith                          $125,000,000
            Incorporated..................

Lehman Brothers, Inc......................                       25,000,000

J.P. Morgan Securities Inc................                       25,000,000

Morgan Stanley & Co. Incorporated.........                       25,000,000

                                                        -------------------
            Total.........................                     $200,000,000
                                                        ===================














                                    Sch A-1
<PAGE>   26


                                   SCHEDULE B



                        EOP Operating Limited Partnership

                                  $200,000,000

                          7.5% Notes due April 19, 2029


         1. The initial public offering price of the Securities shall be 99.456%
of the aggregate principal amount thereof, plus accrued interest, if any, from
April 19, 1999.

         2. The purchase price to be paid by the Underwriters for the Securities
shall be 98.581% of the aggregate principal amount thereof.

         3. The interest rate on the Securities shall be 7.5% per annum.

         4. The Securities will mature on April 19, 2029 unless redeemed at the
option of the Operating Partnership at the redemption price.








                                    Sch B-1


<PAGE>   27


                                   SCHEDULE C



                            Significant Subsidiaries


                                      None















                                    Sch C-1

<PAGE>   28

                                    EXHIBIT A

                        Opinion of Hogan & Hartson L.L.P.

                    (1) The Operating Partnership is a limited partnership
          formed and validly existing and in good standing under the laws of the
          State of Delaware and has the partnership power and partnership
          authority under the limited partnership agreement of the Operating
          Partnership (the "Partnership Agreement") and the Delaware Revised
          Uniform Limited Partnership Act (the "Delaware Act") to own, lease and
          operate its current properties, to conduct the business in which it is
          engaged or proposes to engage as described in the Prospectus and to
          enter into and perform its obligations under the Underwriting
          Agreement and the Indenture (collectively, the "Listed Agreements"),
          and the Securities. The Operating Partnership is qualified or
          registered as a foreign limited partnership and is in good standing
          under the laws of the States listed on Appendix A hereto as of the
          respective dates of the certificates received from such States. The
          Company is the managing general partner of the Operating Partnership.
          As of April ___, 1999 there were ___ Units outstanding and the Company
          held of record _______ Units, as reflected in the Partnership
          Agreement.

                    (2) All of the outstanding units of partnership interest
          ("Units") of the Operating Partnership have been duly authorized for
          issuance by the Operating Partnership to the holders thereof, and
          assuming receipt of the capital contributions specified in the
          Partnership Agreement, are validly issued and fully paid.

                    (3) The Securities have been duly authorized by the
          Operating Partnership. The Securities, when issued and authenticated
          in the manner provided for in the Indenture and delivered against
          payment in accordance with the Underwriting Agreement, will be
          entitled to the benefits of the Indenture, and will constitute valid
          and legally binding obligations of the Operating Partnership,
          enforceable against the Operating Partnership in accordance with their
          terms, except as the enforcement thereof may be limited by bankruptcy,
          insolvency, reorganization, moratorium or other laws affecting
          creditors' rights (including, without limitation, the effect of
          statutory and other law regarding fraudulent conveyances, fraudulent
          transfers and preferential transfers) and as may be limited by the
          exercise of judicial discretion and the application of principles of
          equity, including, without limitation, requirements of good faith,
          fair dealing, conscionability and materiality (regardless of whether
          enforcement is considered in a proceeding at law or in equity).

                    (4) The Underwriting Agreement has been duly authorized,
          executed and delivered by the Operating Partnership.



                                      A-1
<PAGE>   29


                    (5) The Indenture has been duly authorized, executed and
          delivered by the Operating Partnership and (assuming due
          authorization, execution and delivery thereof by the other parties
          thereto) constitutes a valid and binding agreement of the Operating
          Partnership, enforceable against the Operating Partnership in
          accordance with its terms, except as may be limited by bankruptcy,
          insolvency, reorganization, moratorium or other laws affecting
          creditors' rights (including, without limitation, the effect of
          statutory and other law regarding fraudulent conveyances, fraudulent
          transfers and preferential transfers) and as may be limited by the
          exercise of judicial discretion and the application of principles of
          equity, including, without limitation, requirements of good faith,
          fair dealing, conscionability and materiality (regardless of whether
          such agreement is considered in a proceeding at law or in equity) and
          except that a waiver of rights under any usury law may be
          unenforceable.

                    (6) The Indenture has been duly qualified under the 1939
          Act.

                    (7) The Securities and the Indenture conform in all material
          respects to the descriptions thereof contained in the Prospectus.

                    (8) The Registration Statement, including any Rule 462(b)
          Registration Statement, has been declared effective under the 1933
          Act; any required filing of the Prospectus pursuant to Rule 424(b) has
          been made in the manner and within the time period required by Rule
          424(b); and, to the best of such counsel's knowledge, no stop order
          suspending the effectiveness of the Registration Statement or any Rule
          462(b) Registration Statement has been issued under the 1933 Act and
          no proceedings for that purpose have been instituted or are pending or
          threatened by the Commission.

                    (9) The execution, delivery and performance as of the date
          hereof by the Operating Partnership of the Listed Agreements and the
          issuance and sale of the Securities do not (i) violate the Delaware
          Act or the Partnership Agreement, (ii) to such counsel's knowledge,
          violate any applicable law, rule, regulation, order, judgment or
          decree of any Delaware agency or court, or (iii) breach or constitute
          a default under any agreement or contract listed on Appendix B hereto.

                    (10) The Registration Statement, including any Rule 462(b)
          Registration Statement, and the Prospectus, excluding the documents
          incorporated by reference therein, and each amendment or supplement to
          the Registration Statement and Prospectus, excluding the documents
          incorporated by reference therein, as of their respective effective or
          issue dates (other than the financial statements and supporting
          schedules included therein or omitted therefrom, and the Trustee's
          Statement of Eligibility on Form T-1 (the "Form T-1"), as to which
          such counsel need express no opinion), complied



                                      A-2
<PAGE>   30


          as to form in all material respects with the requirements of the 1933 
          Act and the 1933 Act Regulations.

                    (11) The documents incorporated by reference in the
          Registration Statement and the Prospectus (other than the financial
          statements and supporting schedules included therein or omitted
          therefrom, as to which such counsel need express no opinion), when
          they became effective or were filed with the Commission , as the case
          may be, complied as to form in all material respects with the
          requirements of the 1933 Act or the 1934 Act , as applicable, and the
          rules and regulations of the Commission thereunder.

                    (12) Neither the Operating Partnership nor any Significant
          Subsidiary is or after giving effect to the issuance of the Securities
          and the application of the net proceeds therefrom as described in the
          Prospectus will be, as of the date hereof, an "investment company"
          within the meaning of the 1940 Act.

                    (13) No consent, approval, authorization or order of, or
          filing or registration with, the Commission or any Delaware court or
          governmental agency or body is required to be obtained or made by the
          Operating Partnership for the issuance of the Securities or the
          performance as of the date hereof of the obligations contained in the
          Securities and the Listed Agreements by the Operating Partnership.

                    (14) The information in the Prospectus under the captions
          "Description of Notes," "Description of Debt Securities" and "Plan of
          Distribution" to the extent that such information constitutes matters
          of law or legal conclusions, has been reviewed by us and is correct in
          all material respects.

                    (15) The Operating Partnership is classified as a
          partnership, and is not taxed as a corporation or association taxable
          as a corporation, for Federal income tax purposes throughout the
          period from July 7, 1997 through the date hereof.

                    The opinions as to enforceability expressed in Paragraphs
          (3) and (5) above shall be understood to mean only that if there is a
          default in performance of an obligation, (i) if a failure to pay or
          other damage can be shown and (ii) if the defaulting party can be
          brought into a court which will hear the case and apply the governing
          law, then, subject to the availability of defenses, and to the
          exceptions set forth in Paragraphs (3) and (5) above, the court will
          provide a money damage (or perhaps injunctive or specific performance)
          remedy.

                    In giving its opinion required by Section 5(b)(i), such
          counsel shall additionally state that no facts have come to their
          attention which cause such counsel to believe that (i) the
          Registration Statement or any amendment thereto



                                      A-3

<PAGE>   31


          (except for the Form T-1, as to which such counsel need make no
          statement), at the time such Registration Statement or any such
          amendment became effective, contained an untrue statement of a
          material fact or omitted to state a material fact required to be
          stated therein or necessary to make the statements therein not
          misleading or that the Prospectus or any amendment or supplement
          thereto (except for the Form T-1, as to which such counsel need make
          no statement), at the time the Prospectus was issued, at the time any
          such amended or supplemented prospectus was issued or at the Closing
          Time, included or includes an untrue statement of a material fact or
          omitted or omits to state a material fact necessary in order to make
          the statements therein, in the light of the circumstances under which
          they were made, not misleading, (ii) there are any legal or
          governmental proceedings pending or threatened against the Operating
          Partnership that are required to be disclosed in the Prospectus, other
          than those disclosed therein, or (iii) there are any contracts or
          documents of a character required to be described in the Prospectus
          that are not described or referred to therein; provided that in making
          the foregoing statements (which shall not constitute an opinion), such
          counsel need not express any views as to the financial statements and
          supporting schedules and other financial information and data included
          in or omitted from the Prospectus. In making the foregoing statement,
          such counsel may state that such statement is based upon such
          counsel's participation in conferences with officers and other
          representatives of the Operating Partnership, representatives of the
          independent public accountants for the Operating Partnership and with
          you and your representatives during the course of the preparation of
          the Registration Statement and the Prospectus.




                                      A-4

<PAGE>   32


                                                                     Appendix A

                       States Requiring Registration by or
                   Qualification of the Operating Partnership
                        as a Foreign Limited Partnership








                                      A-1

<PAGE>   33


                                                                     Appendix B

                        Material Agreements and Contracts
                          of the Operating Partnership









                                      B-1

<PAGE>   1

                                                                    EXHIBIT 4.23



                                 [FACE OF NOTE]

                        EOP OPERATING LIMITED PARTNERSHIP

                               7.5% NOTES DUE 2029

NO. 001                                                         PRINCIPAL AMOUNT
CUSIP NO. 268766 BH4                                                $200,000,000


         UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT AND ANY NOTE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC AND ANY PAYMENT IS MADE TO CEDE & CO., OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC, ANY
TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

         UNLESS AND UNTIL THIS NOTE IS EXCHANGED IN WHOLE OR IN PART FOR NOTES
IN CERTIFICATED FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC
TO A NOMINEE THEREOF OR BY A NOMINEE THEREOF TO DTC OR ANOTHER NOMINEE OF DTC OR
BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR OF DTC OR A NOMINEE OF SUCH SUCCESSOR.

         THIS NOTE WILL BE ISSUED AND MAY BE TRANSFERRED ONLY IN MINIMUM
DENOMINATIONS OF $1,000 AND INTEGRAL MULTIPLES THEREOF.

         EOP Operating Limited Partnership, a Delaware limited partnership (the
"Issuer," which term includes any successor under the Indenture hereinafter
referred to), for value received, hereby promises to pay to Cede & Co. or
registered assigns, the principal sum of TWO HUNDRED MILLION Dollars on April
19, 2029 (the "Stated Maturity Date"), (or any Redemption Date, as defined on
the reverse hereof) or any earlier date of acceleration of maturity, (each such
date being referred to as the "Maturity Date" with respect to the principal
repayable on such date) and to pay interest thereon from April 19, 1999 (or from
the most recent Interest Payment Date (as defined below) to which interest has
been paid or duly provided for), semiannually in arrears on October 19 and April
19 of each year, commencing on October 19, 1999 (each, an "Interest Payment
Date"), and on the Maturity Date, at a rate of 7.5% per annum, until payment of
said principal sum has been made or duly provided for. Interest on this Note
will be computed on the basis of a 360-day year of twelve 30-day months.

         The interest so payable and punctually paid or duly provided for on an
Interest Payment Date will, subject to certain exceptions described below, be
paid to the Holder in whose name this Note (or one or more predecessor Notes) is
registered at the close of business on the "Regular Record Date" for such
payment, which will be April 1 or October 1 (regardless of whether such day is a
Business Day (as defined below)) next preceding such Interest Payment Date. Any
interest not so punctually paid or duly provided for on an Interest Payment Date
("Defaulted Interest") shall forthwith cease to be


<PAGE>   2

payable to the Holder on such Regular Record Date, and shall be paid to the
Holder in whose name this Note (or one or more predecessor Notes) is registered
at the close of business on a special record date (the "Special Record Date")
for the payment of such Defaulted Interest to be fixed by the Trustee
hereinafter referred to, notice whereof shall be given to the Holder of this
Note by the Trustee not less than 10 calendar days prior to such Special Record
Date or may be paid at any time in any other lawful manner, all as more fully
provided for in the Indenture.

         The principal of and Make-Whole Amount, if any, with respect to this
Note payable on the Maturity Date will be paid against presentation and
surrender of this Note at the office or agency of the Issuer maintained for that
purpose in Boston, Massachusetts with a drop facility maintained in New York,
New York. The Issuer hereby initially designates the Corporate Trust Office of
the Trustee in Boston, Massachusetts as the office to be maintained by it where
Notes may be presented for payment, registration of transfer, or exchange and
where notices or demands to or upon the Issuer in respect of the Notes or the
Indenture may be served.

         Interest payable on this Note on any Interest Payment Date and on the
Maturity Date, as the case may be, will be the amount of interest accrued during
the applicable Interest Period (as defined below).

         An "Interest Period" is each period from and including the immediately
preceding Interest Payment Date (or from and including April 19, 1999, in the
case of the initial Interest Period) to but excluding the applicable Interest
Payment Date or the Maturity Date, as the case may be. If any Interest Payment
Date or Maturity Date falls on a day that is not a Business Day, principal,
Make-Whole Amount, if any, and interest payable on such date will be paid on the
succeeding Business Day with the same force and effect as if it were paid on the
date such payment was due, and no interest will accrue on the amount so payable
for the period from and after such date to such succeeding Business Day.
"Business Day" means any day, other than a Saturday or a Sunday, on which
banking institutions in New York, New York and Boston, Massachusetts are not
required or authorized by law or executive order to close.

         Payments of principal, Make-Whole Amount, if any, and interest in
respect of this Note will be made by U.S. dollar check or by wire transfer (such
a wire transfer to be made only to a Holder of an aggregate principal amount of
Notes in excess of $10,000,000, and only if such Holder shall have furnished
wire instructions in writing to the Trustee no later than 15 days prior to the
relevant payment date and acknowledged that a wire transfer fee shall be
payable) of immediately available funds in such coin or currency of the United
States of America as at the time of payment is legal tender for the payment of
public and private debts.

         Reference is made to the further provisions of this Note set forth on
the reverse hereof. Such further provisions shall for all purposes have the same
effect as though fully set forth at this place. Capitalized terms used herein,
including on the reverse hereof, and not defined herein or on the reverse hereof
shall have the respective meanings given to such terms in the Indenture.

         This Note shall not be entitled to the benefits of the Indenture or be
valid or become obligatory for any purpose until the certificate of
authentication hereon shall have been signed by the Trustee.










                                       2
<PAGE>   3



         IN WITNESS WHEREOF, the Issuer has caused this Note to be signed
manually or by facsimile by duly authorized officers of the General Partner.


Dated:  April 19, 1999       EOP OPERATING LIMITED PARTNERSHIP,
                                  as Issuer

                             By:      EQUITY OFFICE PROPERTIES TRUST, not
                                      individually but as Managing General
                                      Partner



                                      By:      /s/ Timothy H. Callahan
                                               ---------------------------------
                                                   Timothy H. Callahan
                                      Its:      President and Chief Executive
                                                Officer


                                      Attest:



                                      By:      /s/ Stanley M. Stevens
                                               ---------------------------------
                                               Stanley M. Stevens
                                      Its:     Executive Vice President,
                                               Chief Legal Counsel and
                                               Secretary


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series designated herein referred to in the
within-mentioned Indenture.

Dated:  April 19, 1999                STATE STREET BANK AND TRUST COMPANY,
                                      as Trustee


                                      By:      /s/ Donald E. Smith
                                               ---------------------------------
                                               Authorized Officer








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<PAGE>   4


                                [REVERSE OF NOTE]
                        EOP OPERATING LIMITED PARTNERSHIP

                               7.5% NOTES DUE 2029

         This Note is one of a duly authorized issue of senior Notes of the
Issuer (hereinafter called the "Notes") of the series hereinafter specified, all
issued or to be issued under and pursuant to an Indenture dated as of September
2, 1997 (as amended, the "Indenture"), duly executed and delivered by the Issuer
to State Street Bank and Trust Company, as Trustee (herein called the "Trustee,"
which term includes any successor trustee under the Indenture with respect to
the series of Notes of which this Note is a part), to which Indenture and all
indentures supplemental thereto reference is hereby made for a description of
the rights, limitations of rights, obligations, duties, and immunities
thereunder of the Trustee, the Issuer, and the Holders of the Notes, and of the
terms upon which the Notes are, and are to be, authenticated and delivered. The
Notes may be issued in one or more series, which different series may be issued
in various aggregate principal amounts, may mature at different times, may bear
interest (if any) at different rates, may be subject to different redemption
provisions (if any), and may otherwise vary as provided in the Indenture. This
Note is one of a series designated as the 7.5% Notes due 2029 of the Issuer (the
"Notes"), limited in aggregate principal amount to $200,000,000, subject to the
provisions in the Indenture.

         In case an Event of Default with respect to the Notes shall have
occurred and be continuing, the principal hereof and Make-Whole Amount (if any)
may be declared, and upon such declaration shall become, due and payable, in the
manner, with the effect, and subject to the conditions provided in the
Indenture.

         The Issuer may redeem this Note, at any time in whole or from time to
time in part, at the election of the Issuer, at a redemption price equal to the
sum of (i) the principal amount being redeemed plus accrued interest thereon to
the date fixed for redemption (the "Redemption Date") and (ii) the Make-Whole
Amount with respect hereto (the "Redemption Price"); provided, however, that
interest installments due on an Interest Payment Date which is on or prior to
the Redemption Date will be payable to the Holder hereof (or one or more
predecessor Notes) as of the close of business on the Record Date preceding such
Interest Payment Date. If notice has been given as provided in the Indenture and
funds for the redemption of this Note or any part thereof called for redemption
shall have been made available on the Redemption Date, this Note or such part
thereof will cease to bear interest on the Redemption Date referred to in such
notice and the only right of the Holder will be to receive payment of the
Redemption Price. Notice of any optional redemption of any Notes will be given
to the Holder hereof (in accordance with the provisions of the Indenture), not
more than 60 nor less than 30 days prior to the Redemption Date. In the event of
redemption of this Note in part only, a new Note of like tenor for the
unredeemed portion hereof and otherwise having the same terms and provisions as
this Note shall be issued by the Issuer in the name of the Holder hereof upon
the presentation and surrender hereof.

         The Indenture contains provisions for defeasance of (i) the entire
indebtedness of the Notes or (ii) certain covenants and Events of Default with
respect to the Notes, in each case upon compliance with certain conditions set
forth therein, which provisions apply to the Notes.







                                       4
<PAGE>   5


         The Indenture contains provisions permitting the Issuer and the
Trustee, with the consent of the Holders of not less than a majority of the
aggregate principal amount of the Notes at the time Outstanding of all series to
be affected (voting as one class), evidenced as provided in the Indenture, to
execute supplemental indentures adding any provisions to or changing in any
manner or eliminating any of the provisions of the Indenture or of any
supplemental indenture or modifying in any manner the rights of the Holders of
the Notes of each series; provided, however, that no such supplemental indenture
shall, without the consent of the Holder of each Note at the time Outstanding so
affected, (i) change the final maturity of any Note, or reduce the principal
amount thereof or any premium or Make-Whole Amount thereon, if any, or reduce
the rate or extend the time of payment of any interest thereon, or impair or
affect the rights of any Holder to institute suit for the payment on any Note,
or (ii) reduce the percentage in principal amount of Outstanding Notes, the
Holders of which are required to consent to any such supplemental indenture, or
(iii) reduce the percentage in principal amount of Outstanding Notes, the
Holders of which are required to consent to any waiver of compliance with
certain provisions of the Indenture or any waiver of certain defaults
thereunder. It is also provided in the Indenture that, with respect to certain
defaults or Events of Default regarding the Notes of any series, the Holders of
a majority in aggregate principal amount Outstanding of the Notes of such series
(or, in the case of certain defaults or Events of Default, all series of Notes)
may on behalf of the Holders of all the Notes of such series (or all of the
Notes, as the case may be) waive any such past default or Event of Default and
its consequences, prior to any declaration accelerating the maturity of such
Notes, or, subject to certain conditions, may rescind a declaration of
acceleration and its consequences with respect to such Notes. The preceding
sentence shall not, however, apply to a default in or Event of Default relating
to, the payment of the principal of or premium or Make-Whole Amount, if any, or
interest on any of the Notes or in respect of a covenant or provision contained
in the Indenture that cannot be modified or amended without the consent of the
Holders of each Note at the time Outstanding affected thereby. Any such consent
or waiver by the Holder of this Note (unless revoked as provided in the
Indenture) shall be conclusive and binding upon such Holder and upon all future
Holders and owners of this Note and any Notes that may be issued in exchange or
substitution herefor, irrespective of whether or not any notation thereof is
made upon this Note or such other Notes.

         No reference herein to the Indenture and no provision of this Note or
of the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of and any Make-Whole Amount
and interest on this Note in the manner, at the respective times, at the rate
and in the coin or currency herein prescribed.

         This Note is issuable only in registered form without coupons in
denominations of U.S. $1,000 and integral multiples thereof. Notes may be
exchanged for a like aggregate principal amount of Notes of this series of other
authorized denominations at the office or agency of the Issuer in Boston,
Massachusetts, in the manner and subject to the limitations provided herein and
in the Indenture, but without the payment of any service charge except for any
tax or other governmental charge imposed in connection therewith.









                                       5
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         Upon due presentment for registration of transfer of this Note at the
office or agency of the Issuer in Boston, Massachusetts, one or more new Notes
of authorized denominations in an equal aggregate principal amount will be
issued to the transferee in exchange therefor, subject to the limitations
provided in the Indenture, but without the payment of any service charge except
for any tax or other governmental charge imposed in connection therewith.

         This Note is not subject to a sinking fund requirement.

         No recourse under or upon any obligation, covenant or agreement
contained in the Indenture, or any Note, or because of any indebtedness
evidenced hereby or thereby (including, without limitation, any obligation or
indebtedness relating to the principal of, or premium or Make-Whole Amount, if
any, interest or any other amounts due, or claimed to be due, on this Note), or
for any claim based thereon or otherwise in respect thereof, shall be had (i)
against the General Partner or any other partner, or any Person which owns an
interest, directly or indirectly, in any partner, in the Issuer, or (ii) against
any promoter, as such, or against any past, present or future shareholder,
officer, trustee or partner, as such, of the Issuer or the General Partner or of
any successor, either directly or through the Issuer or the General Partner or
any successor, under any rule of law, statute or constitutional provision or by
the enforcement of any assessment or by any legal or equitable proceeding or
otherwise, all such liability being expressly waived and released by the
acceptance hereof and as part of the consideration for the issue hereof.

         Prior to due presentation of this Note for registration of transfer,
the Issuer, the Trustee, and any authorized agent of the Issuer or the Trustee
may deem and treat the Person in whose name this Note is registered as the
absolute owner of this Note (whether or not this Note shall be overdue and
notwithstanding any notation of ownership or other writing hereon), for the
purpose of receiving payment of, or on account of, the principal hereof and
Make-Whole Amount, if any, and subject to the provisions herein and on the face
hereof, interest hereon, and for all other purposes, and neither the Issuer nor
the Trustee nor any authorized agent of the Issuer or the Trustee shall be
affected by any notice to the contrary, except as required by law.

         THE INDENTURE AND THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK, UNITED STATES OF AMERICA
WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS.










                                       6
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                   ASSIGNMENT FORM AND CERTIFICATE OF TRANSFER

To assign this Note fill in the form below:

(I) or (we) assign and transfer this Note to


        (Insert assignee's social security or tax identification number, if any)




              (Print or type assignee's name, address and zip code)

Your signature:

              (Sign exactly as your name appears on the other side of this Note)

Date: 
      -----------------------------------------



Signature Guarantee:* 
                      -------------------------





- -----------------------
* Signature must be guaranteed by a commercial bank, trust company or member
firm or a major stock exchange

<PAGE>   1
                                                                     Exhibit 5.1
                     [LETTERHEAD OF HOGAN & HARTSON L.L.P.]




                                 April 19, 1999


Board of Trustees
Equity Office Properties Trust
2 North Riverside Plaza
Suite 2200
Chicago, IL 60606

Ladies and Gentlemen:

                  We are acting as counsel to EOP Operating Limited Partnership,
a Delaware limited partnership (the "Company"), in connection with its
registration statement on Form S-3 (SEC File No. 333-58689) (the "Registration
Statement"), previously declared effective by the Securities and Exchange
Commission, relating to the proposed public offering of up to $2,000,000,000 in
aggregate amount of one or more series of the Company's unsecured debt
securities or warrants exercisable for debt securities which may be offered and
sold by the Company from time to time as set forth in a prospectus and one or
more supplements thereto, all of which form a part of the Registration
Statement. This opinion letter is rendered in connection with the proposed
public offering of the Company's 7.5% Notes due April 19, 2029 (the "Notes"), as
described in a Prospectus dated July 22, 1998 (the "Prospectus"), and a
Prospectus Supplement dated April 13, 1999 (the "Prospectus Supplement"). This
opinion letter is furnished to you at your request to enable you to fulfill the
requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R. ss. 229.601(b)(5),
in connection with the Registration Statement.

                  For purposes of this opinion letter, we have examined copies
of the following documents:

                  1.       Executed copy of the Registration Statement.

                  2.       The Prospectus and the Prospectus Supplement.

                  3.       The Certificate of Limited Partnership of the
                           Company, as certified by the Secretary of State of
                           the State of Delaware on April 12, 1999 and as
                           certified by the Secretary of Equity Office
                           Properties Trust, a Maryland real estate investment
                           trust and managing general partner of the Company
                           ("EOPT"), on the date hereof as being complete,
                           accurate and in effect.



<PAGE>   2

Board of Trustees
Equity Office Properties Trust
April 19, 1999
Page 2


                  4.       The Agreement of Limited Partnership of the Company,
                           dated as of July 3, 1997, as amended, as certified by
                           the Secretary of EOPT, as managing general partner of
                           the Company, on the date hereof as being complete,
                           accurate and in effect.

                  5.       Certain resolutions of the Board of Trustees of EOPT
                           (the "Board"), adopted at a meeting held on April 12,
                           1999, authorizing, among other things, the offer,
                           issuance and sale of the Notes and arrangements in
                           connection therewith, as certified by the Secretary
                           of EOPT on the date hereof as being complete,
                           accurate and in effect.

                  6.       Certain resolutions of the Pricing Committee of the 
                           Board adopted by written consent on April 13, 1999,
                           as certified by the Secretary of EOPT on the date
                           hereof as being complete, accurate and in effect,
                           relating to, among other things, establishment of the
                           Notes as three new series of the Company's unsecured
                           debt securities under the Indenture dated as of
                           September 2, 1997, between the Company and State
                           Street Bank and Trust Company, as Trustee, as
                           supplemented by the First Supplemental Indenture
                           dated as of February 9, 1998, between the Company and
                           the Trustee (the "Indenture"), authorization of the
                           Underwriting Agreement (as defined below), and
                           arrangements in connection therewith, and the
                           issuance of the Notes on the terms set forth therein
                           and in accordance with the terms of the Indenture.

                  7.       Executed copies of the Underwriting Agreement dated
                           April 13, 1999, by and among the Company and Merrill
                           Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith
                           Incorporated, as representative of the several
                           underwriters listed on Schedule A thereto (the
                           "Underwriting Agreement").

                  8. Executed copy of the Indenture.

                  In our examination of the aforesaid documents, we have assumed
the genuineness of all signatures, the legal capacity of natural persons, the
accuracy and completeness of all documents submitted to us, the authenticity of
all original documents and the conformity to authentic original documents of all
documents submitted to us as copies (including telecopies). This opinion letter
is given, and all statements herein are made, in the context of the foregoing.

                  This opinion letter is based as to matters of law solely on
applicable provisions of (i) the Delaware Revised Uniform Limited Partnership
Act, as amended, (ii) Title 8 of the



<PAGE>   3

Board of Trustees
Equity Office Properties Trust
April 19, 1999
Page 3


Corporations and Associations Article of the Annotated Code of Maryland, as
amended, and (iii) the laws of the State of New York relating to the creation
and enforceability of contracts, but not including any laws, statutes,
ordinances, administrative decisions, rules, or regulations of any political
subdivision of the State of New York, and we express no opinion as to any other
laws, statutes, ordinances, rules or regulations (such as federal or state
securities or "blue sky" laws).

                  Based upon, subject to and limited by the foregoing, we are of
the opinion that, assuming due authentication of the Notes by the Trustee and
the due execution and delivery of the Notes on behalf of the Company against
payment of the consideration for the Notes specified in the Underwriting
Agreement, the Notes constitute valid and binding obligations of the Company,
enforceable against the Company in accordance with their terms, except as the
enforcement thereof may be limited by bankruptcy, insolvency, reorganization,
moratorium or other laws affecting creditors' rights (including, without
limitation, the effect of statutory and other law regarding fraudulent
conveyances, fraudulent transfers and preferential transfers) and as may be
limited by the exercise of judicial discretion and the application of principles
of equity, including, without limitation, requirements of good faith, fair
dealing, conscionability and materiality (regardless of whether the Notes are
considered in a proceeding at law or in equity).

                  The opinion as to enforceability expressed above shall be
understood to mean only that if there is a default in performance of an
obligation, (i) if a failure to pay or other damage can be shown and (ii) if the
defaulting party can be brought into a court which will hear the case and apply
the governing law, then, subject to the availability of defenses, and to the
exceptions set forth above, the court will provide a money damage (or perhaps
injunctive or specific performance) remedy.

                  To the extent that the obligations of the Company under the
Indenture may be dependent upon such matters, we assume for purposes of this
opinion that the Trustee is duly organized, validly existing and in good
standing under the laws of its jurisdiction of organization; that the Trustee is
duly qualified to engage in the activities contemplated by the Indenture; that
the Indenture has been duly authorized, executed and delivered by the Trustee
and constitutes the valid and binding obligation of the Trustee enforceable
against the Trustee in accordance with its terms; that the Trustee is in
compliance, with respect to acting as a trustee under the Indenture, with all
applicable laws and regulations; and that the Trustee has the requisite
organizational and legal power and authority to perform its obligations under
the Indenture.

                  We assume no obligation to advise you of any changes in the
foregoing subsequent to the delivery of this opinion letter. This opinion letter
has been prepared solely in connection with the filing by the Company of a
Current Report on Form 8-K on the date hereof, which Form 8-K will be
incorporated by reference into the Registration Statement. This opinion letter
should 


<PAGE>   4

Board of Trustees
Equity Office Properties Trust
April 19, 1999
Page 4


not be quoted in whole or in part or otherwise be referred to, nor filed with or
furnished to any governmental agency or other person or entity, without the
prior written consent of this firm.

                  We hereby consent to the filing of this opinion letter as
Exhibit 5.1 to the above-described Form 8-K and to the reference to this firm
under the caption "Legal Matters" in the Prospectus and the Prospectus
Supplement. 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,


                                              /s/ Hogan & Hartson L.L.P.

                                              HOGAN & HARTSON L.L.P.





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