HRPT PROPERTIES TRUST
8-K, 1998-11-25
REAL ESTATE INVESTMENT TRUSTS
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                       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): November 24, 1998





                              HRPT PROPERTIES TRUST
               (Exact name of registrant as specified in charter)



<TABLE>
     <S>                      <C>                    <C>

        Maryland                   1-9317                  04-6558834
     (State or other          (Commission file           (IRS employer
     jurisdiction of              number)             identification no.)
     incorporation)
</TABLE>


         400 Centre Street, Newton, Massachusetts      02458
         (Address of principal executive offices)    (Zip code)


        Registrant's telephone number, including area code: 617-332-3990


<PAGE>




Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits

(c)       Exhibits.

         1.1      Purchase Agreement dated as of November 24, 1998 by and among
                  HRPT Properties Trust and the several Underwriters named
                  therein pertaining to $130,000,000 in aggregate principal
                  amount of 8 1/2% Monthly Income Senior Notes due 2013.

         4.1      Form of Supplemental Indenture dated as of November 30, 1998
                  by and between HRPT Properties Trust and State Street Bank and
                  Trust Company pertaining to $130,000,000 in aggregate
                  principal amount of 8 1/2% Monthly Income Senior Notes due
                  2013.

         5.1      Consent of Sullivan & Worcester LLP (contained in exhibit 8.1)

         8.1      Opinion of Sullivan & Worcester LLP re tax matters






<PAGE>


                                   SIGNATURES

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 thereunto duly authorized.

                                    HRPT PROPERTIES TRUST



                                    By: /s/ Ajay Saini
                                        ------------------------------
                                        Ajay Saini
                                        Treasurer and Chief Financial Officer

Date: November 24, 1998






                              HRPT PROPERTIES TRUST
                    (a Maryland real estate investment trust)

                   8 1/2% Monthly Income Senior Notes due 2013

                               PURCHASE AGREEMENT
                               ------------------



                                                               November 24, 1998



MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
            INCORPORATED
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
A.G. EDWARDS & SONS, INC.
LEGG MASON WOOD WALKER, INCORPORATED
MORGAN STANLEY & CO. INCORPORATED
PAINEWEBBER INCORPORATED
PRUDENTIAL SECURITIES INCORPORATED
SALOMON SMITH BARNEY INC.
c/o   MERRILL LYNCH & CO.
      Merrill Lynch, Pierce, Fenner & Smith
                  Incorporated
      World Financial Center - North Tower
      250 Vesey Street
      New York, NY 10281-1326


Ladies and Gentlemen:

         HRPT Properties Trust, a Maryland real estate investment trust (the
"Company"), confirms its agreement with Merrill Lynch & Co., Merrill Lynch,
Pierce, Fenner & Smith Incorporated ("Merrill Lynch"), Donaldson, Lufkin &
Jenrette Securities Corporation, A.G. Edwards & Sons, Inc., Legg Mason Wood
Walker, Incorporated, Morgan Stanley & Co. Incorporated, PaineWebber
Incorporated, Prudential Securities Incorporated and Salomon Smith Barney Inc.
(collectively, the "Underwriters," which term shall include any underwriter
substituted as hereinafter provided in Section 10 hereof), with respect to the
sale by the Company and the purchase by each such Underwriter severally, of the
Company's $130,000,000 of principal amount of 8 1/2% Monthly Income Senior Notes
due 2013 (the "Notes") set forth opposite the name of each such Underwriter
listed in Schedule A hereto at a purchase price of 97% of the principal amount
of the Notes and with respect to the grant by the Company to the Underwriters of
the option described in Section 2 hereof to purchase all or any part of an
additional $19,500,000 aggregate principal amount of such Notes to cover
over-allotments. The aforesaid $130,000,000 principal amount of such Notes (the
"Initial Notes"), together with all or any part of the $19,500,000 additional
principal amount subject to the option described in Section 2 hereof (the
"Option




<PAGE>

Notes"), are collectively hereinafter called the "Notes". The Notes are to be
issued pursuant to an indenture dated as of July 9, 1997 and a supplemental
indenture dated as of November 30, 1998 (together, the "Indenture"), each
between the Company and State Street Bank and Trust Company (the "Trustee").

        The Company has filed with the Securities and Exchange Commission (the
"Commission") a registration statement on Form S-3 (No. 333-56051) for the
registration of debt securities, preferred shares of beneficial interest,
depositary shares, common shares of beneficial interest and warrants under the
Securities Act of 1933, as amended (the "1933 Act"), and has filed such
amendments thereto, if any, as may have been required to the date hereof. Such
registration statement has been declared effective under the 1933 Act. Such
registration statement (as amended, if applicable) and the prospectus
constituting a part thereof, as supplemented by the prospectus supplement
relating to the Notes (including, in each case, all documents incorporated or
deemed to be incorporated by reference therein), as from time to time amended or
supplemented pursuant to the 1933 Act, the Securities Exchange Act of 1934, as
amended (the "1934 Act"), or otherwise, are hereinafter referred to as the
"Registration Statement" and the "Prospectus", respectively. All references in
this Agreement to financial statements and schedules and other information which
is "contained", "included" or "stated" in the Registration Statement or the
Prospectus (and all other references of like import) shall be deemed to mean and
include all such financial statements and schedules and other information which
is or is deemed to be incorporated by reference in the Registration Statement or
in the Prospectus, as the case may be.

         Section 1. Representations and Warranties.

         (a) The Company represents and warrants to each Underwriter as of the
date hereof as follows:

               (i) At the time the Registration Statement became effective, the
          Registration Statement complied in all material respects with the
          requirements of the 1933 Act and the rules and regulations under the
          1933 Act (the "1933 Act Regulations") and did 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. The Prospectus, at the date hereof (unless the term
          "Prospectus" refers to a prospectus which has been provided to the
          Underwriters by the Company for use in connection with the offering of
          the Notes which differs from the Prospectus on file at the Commission
          at the date of effectiveness of the Registration Statement, in which
          case at the time it is first provided to the Underwriters for such
          use) and at the Closing Time referred to in Section 2 hereof, does 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; provided, however, that the representations and
          warranties in this subsection (i) shall not apply to statements or
          omissions in the Registration Statement or the Prospectus made in
          reliance upon and in conformity with information furnished to the
          Company in writing by any Underwriter through Merrill Lynch expressly
          for use in the Registration Statement or the Prospectus.



                                       2
<PAGE>

         (ii) The documents incorporated or deemed to be incorporated by
reference in the Prospectus, 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 1934 Act and the rules and regulations of the Commission
under the 1934 Act (the "1934 Act Regulations"), and, when read together with
the other information in the Prospectus, at the time the Registration Statement
became effective and at Closing Time, did not and will not include an untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading. 

         (iii) The Company is a Maryland real estate investment trust duly
organized, validly existing and in good standing under the laws of the State of
Maryland. Each of its subsidiaries has been duly organized and is validly
existing as a corporation or trust in good standing under the laws of its
jurisdiction of incorporation or organization. Each of the Company and its
subsidiaries has full power and authority (corporate and other) to carry on its
business as described in the Registration Statement and in the Prospectus and to
own, lease and operate its properties. Each of the Company and its subsidiaries
is duly qualified and is in good standing as a foreign corporation or trust, as
the case may be, and is authorized to do business in each jurisdiction in which
the nature of its business or its ownership or leasing of property requires such
qualification, except where the failure to be so qualified would not have a
material adverse effect on the Company and its subsidiaries, taken as a whole.

         (iv) The financial statements of the Company and its subsidiaries,
together with the related schedules and notes thereto, included or incorporated
by reference in the Registration Statement and in the Prospectus, comply as to
form in all material respects with the requirements of the 1933 Act. Such
financial statements of the Company, together with the related schedules and
notes thereto, present fairly the consolidated financial position, results of
operations, shareholders' equity and changes in financial position of the
Company and its subsidiaries, at the dates or for the periods therein specified
and have been prepared in accordance with generally accepted accounting
principles ("GAAP") consistently applied throughout the periods involved. The
pro forma financial statements and other pro forma financial information
(including the notes thereto) included or incorporated by reference in the
Registration Statement and in the Prospectus (i) present fairly the information
shown therein, (ii) have been prepared in accordance with the Commission's rules
and guidelines with respect to pro forma financial statements and (iii) have
been properly compiled on the basis described therein and the assumptions used
in the preparation of such pro forma financial statements and other pro forma
financial information (including the 




                                       3
<PAGE>

notes thereto) are reasonable and the adjustments used therein are appropriate
to give effect to the transactions or circumstances referred to therein. 

         (v) The accountants who have certified the financial statements of the
Company and its subsidiaries included or incorporated by reference in the
Registration Statement and in the Prospectus are independent certified public
accountants as required by the 1933 Act. 

         (vi) The Indenture has been duly qualified under the Trust Indenture
Act of 1939 (the "1939 Act") and has been duly authorized, executed and
delivered by the Company and is a valid and binding agreement of the Company
enforceable in accordance with its terms, except as limited by (a) the effect of
bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer or other
similar laws relating to or affecting the rights or remedies of creditors or (b)
the effect of general principles of equity (regardless of whether enforcement is
sought in a proceeding in equity or at law). 

         (vii) All of the issued and outstanding indebtedness of the Company is
duly and validly authorized and issued; the Notes have been authorized by all
necessary trust action and, when executed and authenticated in accordance with
the provisions of the Indenture and delivered and paid for pursuant to this
Agreement, will be valid and binding obligations of the Company enforceable in
accordance with their terms, except as limited by (a) the effect of bankruptcy,
insolvency, reorganization, moratorium, fraudulent transfer or other similar
laws relating to or affecting the rights or remedies of creditors or (b) the
effect of general principles of equity (regardless of whether enforcement is
sought in a proceeding in equity or at law). 

         (viii) The Notes and the Indenture conform to the descriptions thereof
in the Registration Statement and in the Prospectus. 

         (ix) The authorized capital of the Company, including the Notes,
conforms as to legal matters to the description thereof contained in the
Prospectus (or the documents incorporated therein by reference). 

         (x) Since the respective dates as of which information is given in the
Prospectus, and except as otherwise disclosed therein, (i) there has been no
material adverse change in the business, operations, earnings, prospects,
properties or condition (financial or otherwise) of the Company and its
subsidiaries, taken as a whole, whether or not arising in the ordinary course of
business, (ii) there have been no material transactions entered into by the
Company and its subsidiaries, on a consolidated basis, other than transactions
in the ordinary course of business, (iii) neither the Company nor its
subsidiaries has incurred any material liabilities or obligations, direct or
contingent, (iv) the Company and its subsidiaries, on a consolidated basis, have
not, (A) other than regular quarterly dividends, declared, paid or made a
dividend or distribution of any kind on any class of its shares of beneficial
interest (other than dividends or distributions from wholly owned subsidiaries
to the Company),  issued any shares of beneficial interest of the Company or
any of its 




                                       4
<PAGE>

subsidiaries or any options, warrants, convertible securities or
other rights to purchase the shares of beneficial interest of the Company or any
of its subsidiaries (other than the issuance of common shares of beneficial
interest ("Common Shares") upon conversion of certain convertible debentures of
the Company or (C) repurchased or redeemed shares of beneficial interest, and
(v) there has not been (A) any material decrease in the Company's net worth or
(B) any material increase in the short-term or long-term debt (including
capitalized lease obligations but excluding borrowings under existing bank lines
of credit) of the Company and its subsidiaries, on a consolidated basis. 

         (xi) The Company and each of its subsidiaries maintains a system of
internal accounting controls sufficient to provide reasonable assurance that (i)
transactions are executed in accordance with management's general or specific
authorizations; (ii) transactions are recorded as necessary to permit
preparation of financial statements in conformity with GAAP and to maintain
asset accountability; (iii) access to assets is permitted only in accordance
with management's general or specific authorization; and (iv) the recorded
accountability for assets is compared with the existing assets at reasonable
intervals and appropriate action is taken with respect to any differences. 

         (xii) Neither the Company nor any of its subsidiaries is in violation
of its respective charter or by-laws or other organizational documents or in
default in the performance of any obligation, agreement or condition contained
in any bond, debenture, note or any other evidence of indebtedness or in any
other agreement, indenture or instrument to which the Company or any of its
subsidiaries is a party or by which any of their respective properties or assets
may be bound or affected, except for any such violation that would not have a
material adverse effect on the condition, financial or otherwise or in the
earnings, business affairs or business prospects of the Company and its
subsidiaries, taken as a whole. The Company is not in violation of any law,
ordinance, governmental rule or regulation or court decree to which it is
subject, except for any such violations that would not, individually or in the
aggregate, have a material adverse effect on the business, operations, earnings,
prospects, properties or condition (financial or otherwise) of any of the
Company and its subsidiaries, taken as a whole. 

         (xiii) Except as disclosed in the Registration Statement or in the
Prospectus, there is not now pending or, to the knowledge of the Company,
threatened, any litigation, action, suit or proceeding to which the Company is
or will be a party before or by any court or governmental agency or body, which
(A) might result in any material adverse change in the condition, financial or
otherwise, or in the earnings, business affairs or business prospects of the
Company or (B) might materially and adversely affect the property or assets of
the Company or (C) concerns the Company and is required to be disclosed in the
Registration Statement or the Prospectus, or (D) could adversely affect the
consummation of this Agreement and the issuance, purchase and sale of the Notes.
No contract or other document is required to be described in the Registration
Statement or in the Prospectus or to be filed as an exhibit to the Registration
Statement that is not described therein or filed as required. 

         (xiv) The execution, delivery and performance by the Company of this
Agreement, the issuance, offering and sale by the Company of the Notes as
contemplated by the Registration Statement and by the Prospectus and the
consummation of the 




                                       5
<PAGE>

transactions contemplated hereby and compliance with the terms and provisions
hereof, will not violate or conflict with or constitute a breach of any of the
terms or provisions of, or a default under, (i) the Amended and Restated
Declaration of Trust (the "Declaration of Trust") or the By-laws of the Company
or the charter or by-laws or other organizational documents of any subsidiaries
of the Company, (ii) any agreement, indenture or other instrument to which the
Company or any of its subsidiaries is a party or by which the Company or any of
its subsidiaries or their respective properties or assets is bound, or (iii) any
laws, administrative regulations or rulings or decrees to which the Company or
any of its subsidiaries or their respective properties or assets may be subject.

         (xv) No consent, approval, authorization or order of, or registration,
filing or qualification with, any governmental body or regulatory agency having
jurisdiction over the Company or any of its subsidiaries or any of their
respective properties or assets is required for the execution, delivery and
performance of this Agreement and the consummation of the transactions
contemplated hereby, including, without limitation, the issuance, sale and
delivery of the Notes pursuant to this Agreement, except such as have been
obtained and such as may be required under foreign and state securities or "Blue
Sky" or real estate syndication laws. 

         (xvi) Except as otherwise disclosed in the Registration Statement or in
the Prospectus, the Company and each of its subsidiaries has good and marketable
title or ground leases, free and clear of all liens, claims, encumbrances and
restrictions, except liens for taxes not yet due and payable and other liens and
encumbrances which do not, either individually or in the aggregate, materially
and adversely affect the current use or value thereof, to all property and
assets described in the Registration Statement or in the Prospectus as being
owned by them. Except as otherwise set forth in the Registration Statement or in
the Prospectus, all leases to which the Company and each of its subsidiaries is
a party relating to real property, and all other leases which are material to
the business of the Company and its subsidiaries, taken as a whole, are valid
and binding, and no default (to the Company's knowledge, in the case of leases
to which the Company is a party as lessor, that would, individually or in the
aggregate, have a material adverse effect on the business, operations, earnings,
prospects, properties or condition (financial or otherwise) of the Company and
its subsidiaries, taken as a whole) has occurred and is continuing thereunder,
and the Company and each of its subsidiaries enjoys peaceful and undisturbed
possession under all such leases to which it is a party as lessee. With respect
to all properties owned or leased by the Company and each of its subsidiaries,
the Company or such subsidiary has such documents, instruments, certificates,
opinions and assurances, including without limitation, fee, leasehold owners or
mortgage title insurance policies (disclosing no encumbrances or title
exceptions which are material to the Company and its subsidiaries considered as
a whole, except as otherwise set forth in the Registration Statement and in the
Prospectus), legal opinions and property insurance policies in each case in form
and substance as are usual and customary in transactions involving the purchase
of similar real estate and are appropriate for the Company or such subsidiary to
have obtained. 

         (xvii) The Company and each of its subsidiaries owns, or possesses
adequate rights to use, all patents, trademarks, trade names, service marks,
copyrights, licenses and


                                       6
<PAGE>

other rights necessary for the conduct of their respective businesses as
described in the Registration Statement and in the Prospectus, and neither the
Company nor any of its subsidiaries has received any notice of conflict with, or
infringement of, the asserted rights of others with respect to any such patents,
trademarks, trade names, service marks, copyrights, licenses and other such
rights (other than conflicts or infringements that, if proven, would not have a
material adverse effect on the business, operations, earnings, prospects,
properties or condition (financial or otherwise) of the Company and its
subsidiaries, taken as a whole), and neither the Company nor any of its
subsidiaries knows of any basis therefor. 

         (xviii) All material tax returns required to be filed by the Company
and each of its subsidiaries in any jurisdiction have been timely filed, other
than those filings being contested in good faith, and all material taxes,
including withholding taxes, penalties and interest, assessments, fees and other
charges due pursuant to such returns or pursuant to any assessment received by
the Company or any of its subsidiaries have been paid, other than those being
contested in good faith and for which adequate reserves have been provided.

         (xix) Except for those matters which in the aggregate do not have a
material adverse effect on the business, operations, earnings, prospects,
properties or condition (financial or otherwise) of the Company and its
subsidiaries taken as a whole, and except for Hazardous Materials (as defined
below) or substances which are handled and/or disposed of in compliance with all
applicable federal, state and local requirements, to the Company's knowledge,
after due investigation, the real property owned, leased or otherwise operated
by the Company and each of its subsidiaries in connection with the operation of
their respective businesses, including, without limitation, any subsurface soils
and ground water (the "Realty"), is free of contamination from any Hazardous
Materials. To the Company's knowledge, after due investigation, the Realty does
not contain any underground storage or treatment tanks, active or abandoned
water, gas or oil wells, or any other underground improvements or structures,
other than the foundations, footings, or other supports for the improvements
located thereon which, based on present knowledge, could, in their present
condition, reasonably be expected to presently cause a material detriment to or
materially impair the beneficial use thereof by the Company or constitute or
cause a significant health, safety or other environmental hazard to occupants or
users thereof without regard to any special conditions of such occupants or
users. The Company represents that, after due investigation, it has no knowledge
of any material violation, with respect to the Realty, of any Environmental Law,
or of any material liability on the part of the Company with respect to the
Realty, resulting from the presence, use, release, threatened release, emission,
disposal, pumping, discharge, generation or processing of any Hazardous
Materials. As used herein, "Environmental Law" means any federal, state or local
statute, regulation, judgment, order or authorization relating to emissions,
discharges, releases or threatened releases of Hazardous Materials into ambient
air, surface water, ground water, publicly-owned treatment works, septic systems
or land, or otherwise relating to the pollution or protection of public health
or the environment, and "Hazardous Materials" means any substance, material or
waste which is regulated, defined, or listed as a "hazardous waste", "hazardous
substance", "toxic substance", "medical waste", "infectious waste" or other




                                       7
<PAGE>

similar terms in any Environmental Law or by any federal, state or local
government or quasi-government authority, or any petroleum products, asbestos,
lead-based paint, polychlorinated biphenyls, flammable explosives or radioactive
materials. 

         (xx) Each of the Company and its subsidiaries has such permits,
licenses, franchises and authorizations of governmental or regulatory
authorities (together, "permits"), including, without limitation, under any
applicable Environmental Law, as are necessary to own, lease and operate its
properties and to engage in the business currently conducted by it, except such
licenses and permits as to which the failure to own or possess will not in the
aggregate have a material adverse effect on the business, operations, earnings,
prospects, properties or condition (financial or otherwise) of the Company, and
the Company does not have any reason to believe that any governmental body or
agency is considering limiting, suspending or revoking any such license,
certificate, permit, authorization, approval, franchise or right; each of the
Company and its subsidiaries has fulfilled and performed all of its material
obligations with respect to such permits, and no event has occurred which
allows, or after notice or lapse of time would allow, revocation or termination
thereof or results in any other material impairment of the rights of the holder
of any such permit; and, except as described in the Registration Statement and
in the Prospectus, such permits contain no restrictions that are materially
burdensome to the Company or any of its subsidiaries. 

         (xxi) To the knowledge of the Company, no labor problem exists or is
imminent with employees of the Company or any of its subsidiaries that could
have a material adverse effect on the business, operations, earnings, prospects,
properties or condition (financial or otherwise) of the Company and its
subsidiaries, taken as a whole. (xxii) Neither the Company nor any of its
subsidiaries nor, to the knowledge of the Company, any officer, trustee or
director purporting to act on behalf of the Company or any of its subsidiaries,
has at any time: (i) made any contributions to any candidate for political
office, or failed to disclose fully any such contributions, in violation of law;
(ii) made any payment of funds to, or received or retained any funds from, any
state, federal or foreign governmental officer or official, or other person
charged with similar public or quasi-public duties, other than payments required
or allowed by applicable law; or (iii) engaged in any transactions, maintained
any bank accounts or used any corporate funds except for transactions, bank
accounts and funds, which have been and are reflected in the normally maintained
books and records of the Company and its subsidiaries. 

         (xxiii) All of the outstanding shares of beneficial interest of, or
other ownership interests in, each of the Company's subsidiaries have been duly
authorized and validly issued and are fully paid and, except as to subsidiaries
that are partnerships, nonassessable, and, except as disclosed in the
Registration Statement or in the Prospectus, are or will be owned by the Company
free and clear of any security interest, claim, lien, encumbrance or adverse
interest of any nature. 

         (xxiv) Except as referred to or described in the Registration Statement
and in the Prospectus, none of the subsidiaries of the Company owns any shares
of stock or any other securities of any corporation or has any equity interest
in any firm, partnership, 



                                       8
<PAGE>

association or other entity other than the issued capital shares of its
subsidiaries, and the Company does not own, directly or indirectly, any shares
of stock or any other securities of any corporation or have any equity interest
in any firm, partnership, association or other entity other than the issued
capital shares of its subsidiaries, except in each case for non-controlling
positions acquired in the ordinary course of business. 

         (xxv) Except as disclosed in the Registration Statement and in the
Prospectus, there are no material outstanding loans or advances or material
guarantees of indebtedness by the Company or any of its subsidiaries to or for
the benefit of any of the officers, trustees or directors of the Company or any
of its subsidiaries or any of the members of the families of any of them. 

         (xxvi) The Company and each of its subsidiaries maintains insurance,
duly in force, with insurers of recognized financial responsibility; such
insurance insures against such losses and risks as are adequate in accordance
with customary industry practice to protect the Company and its subsidiaries and
their respective businesses; and neither the Company nor any such subsidiary has
any reason to believe that it will not be able to renew its existing insurance
coverage as and when such coverage expires or to obtain similar coverage from
similar insurers as may be necessary to continue its business at a cost that
would not materially and adversely affect the business, operations, earnings,
prospects, properties or condition (financial or otherwise) of the Company and
its subsidiaries, taken as a whole, except as disclosed in or contemplated by
the Registration Statement and by the Prospectus. 

         (xxvii) Neither the Company nor any of its officers and directors (as
defined in the 1933 Act Regulations) has taken or will take, directly or
indirectly, prior to the termination of the offering contemplated by this
Agreement, any action designed to stabilize or manipulate the price of any
security of the Company, or which has caused or resulted in, or which might in
the future reasonably be expected to cause or result in, stabilization or
manipulation of the price of any security of the Company to facilitate the sale
or resale of the Notes. 

         (xxviii) Neither the Company nor any of its subsidiaries is an
"investment company" or an "affiliated person" of, or "promoter" or "principal
underwriter" for, an "investment company" as such terms are defined in the
Investment Company Act of 1940, as amended (the "1940 Act"), or an "investment
adviser" as such term is defined in the Investment Advisers Act of 1940, as
amended.

         (xxix) The Company is organized in conformity with the requirements for
qualification, and, as of the date hereof the Company operates, and as of
Closing Time the Company will operate, in a manner that qualifies the Company as
a "real estate investment trust" under the Internal Revenue Code of 1986, as
amended (the "Code"), and the rules and regulations thereunder, for 1998 and
subsequent years. The Company qualified as a real estate investment trust under
the Code for each of its taxable years from 1987 through 1997. 




                                       9
<PAGE>

         (xxx) No default exists, and no event has occurred which, with notice
or lapse of time or both, would constitute a default in the due performance and
observance of any term, covenant or condition of any indenture, mortgage, deed
of trust, lease or other agreement or instrument to which the Company or any of
its subsidiaries is a party or by which the Company or any of its subsidiaries
or any of their respective properties is bound or may be affected, except such
defaults which, singly or in the aggregate, would not have a material adverse
effect on the business, operations, earnings, prospects, properties or condition
(financial or otherwise) of the Company and its subsidiaries, considered as a
whole, except as disclosed in the Registration Statement and in the Prospectus.

         (xxxi) Except as otherwise disclosed in the Prospectus, since the
respective dates as of which information is given in the Prospectus, there has
been no material adverse change in the business, operations, earnings,
prospects, properties or condition (financial or otherwise) of REIT Management &
Research, Inc. (the "Advisor"), whether or not arising in the ordinary course of
business, that would have a material adverse effect on the Company and its
subsidiaries, taken as a whole. The Advisory Agreement, dated as of January 1,
1998 (the "Advisory Agreement"), between the Company and the Advisor, has been
duly authorized, executed and delivered by the parties thereto and constitutes
the valid agreement of the parties thereto, enforceable in accordance with its
terms, except as limited by (a) the effect of bankruptcy, insolvency,
reorganization, moratorium, fraudulent transfer or other similar laws relating
to or affecting the rights or remedies of creditors or (b) the effect of general
principles of equity (regardless of whether enforcement is sought in a
proceeding in equity or at law). 

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

         Section 2. Sale and Delivery to the Underwriters; Closing.

         (a) On the basis of the representations and warranties herein contained
and subject to the terms and conditions herein set forth, the Company agrees to
sell to each Underwriter, severally and not jointly, and each Underwriter,
severally and not jointly, agrees to purchase from the Company, the Notes as set
forth in Schedule A.

         (b) In addition, on the basis of the representations and warranties
herein included and subject to the terms and conditions herein set forth, the
Company hereby grants an option to the Underwriters, severally and not jointly,
to purchase up to an additional $19,500,000 principal amount of Notes at the
purchase price set forth on the first page of this Agreement. The option hereby
granted will expire 30 days after the date of this Agreement and may be
exercised in whole or in part from time to time only for the purpose of covering
over-allotments which may be made in connection with the offering and
distribution of the Initial Notes upon notice by Merrill Lynch to the Company
setting forth the principal amount of Option Notes as to which the several
Underwriters are then exercising the option and the time, date and place of
payment and delivery for such Option Notes. Any such time and date of delivery
(a "Date of Delivery") shall 



                                       10
<PAGE>

be determined by Merrill Lynch but shall not be later than seven full business
days, nor earlier than two full business days, after the exercise of said
option, nor in any event prior to Closing Time, unless otherwise agreed upon by
the Underwriters and the Company. If the option is exercised as to all or any
portion of the Option Notes, such Option Notes shall be purchased by the
Underwriters, severally and not jointly, in proportion to their respective
Initial Note underwriting obligations as set forth in Schedule A. 

         (c) Payment of the purchase price for and delivery of the Initial Notes
shall be made, subject to Section 9, at the offices of Sullivan & Worcester LLP,
One Post Office Square, Boston, Massachusetts 02109, or at such other place as
shall be agreed upon by the Underwriters and the Company, at 9:00 A.M. on the
third (fourth, if the pricing occurs after 4:30 P.M. (Eastern time) on any given
day) business day (unless postponed in accordance with the provisions of Section
10 hereof) following the date of this Agreement, or such other time not later
than ten business days after such date as shall be agreed upon by the
Underwriters and the Company (such time and date of payment and delivery being
herein called "Closing Time"). In addition, in the event that the over-allotment
option described in (b) above is exercised by the Underwriters, payment of the
purchase price for and delivery of the Option Notes shall be made at the
above-mentioned office of Sullivan & Worcester LLP, or at such other place as
shall be agreed upon by Merrill Lynch and the Company on each Date of Delivery
as specified in the notice to the Company. Payment shall be made by wire
transfer of immediately available funds payable to the order of the Company
against delivery to the Underwriters of the Notes to be purchased by them. It is
understood that each Underwriter has authorized Merrill Lynch, for its account,
to accept delivery of, receipt for, and make payment of the purchase price for,
the Notes which it has severally 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 Notes to be purchased by any
Underwriter whose funds have not been received by the Closing Time or the Date
of Delivery, as the case may be, but such payment shall not relieve such
Underwriter from its obligations hereunder. The Notes shall be in such
authorized denominations and registered in such names as the Underwriters may
request in writing at least one business day before Closing Time or the Date of
Delivery, as the case may be.

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

         (a) Immediately following the execution of this Agreement, the Company
will prepare a Prospectus Supplement setting forth the aggregate principal
amount of Notes covered thereby and their terms not otherwise specified in the
Prospectus, the Underwriters' names, the price at which the Notes are to be
purchased by the Underwriters from the Company, and such other information as
the Underwriters and the Company deem appropriate in connection with the
offering of the Notes; and the Company will promptly transmit copies of the
Prospectus Supplement to the Commission for filing pursuant to Rule 424(b) of
the 1933 Act Regulations and will furnish to the Underwriters as many copies of
the Prospectus (including such Prospectus Supplement) as they shall reasonably
request.

         (b) Until the termination of the initial offering of the Notes, the
Company will notify the Underwriters immediately, and confirm the notice in
writing, (i) of the effectiveness of any amendment to the Registration
Statement, (ii) of the transmittal to the Commission for filing of 



                                       11
<PAGE>

any supplement or amendment to the Prospectus or any document to be filed
pursuant to the 1934 Act, (iii) of the receipt of any comments from the
Commission with respect to the Notes, (iv) of any request by the Commission for
any amendment to the Registration Statement or any amendment or supplement to
the Prospectus with respect to the Notes or for additional information relating
thereto, and (v) of the issuance by the Commission of any stop order suspending
the effectiveness of the Registration Statement or the initiation of any
proceedings for that purpose. The Company will make every reasonable effort to
prevent the issuance of any such stop order and, if any stop order is issued, to
obtain the lifting thereof at the earliest possible moment. 

         (c) The Company will give the Underwriters notice of its intention to
file or prepare any post-effective amendment to the Registration Statement or
any amendment or supplement (including any document to be filed pursuant to the
1934 Act prior to the termination of the initial offering of the Notes) to the
Prospectus (including any revised prospectus which the Company proposes for use
by the Underwriters in connection with the offering of the Notes which differs
from the prospectus on file at the Commission at the time that the Registration
Statement becomes effective, whether or not such revised prospectus is required
to be filed pursuant to Rule 424(b) of the 1933 Act Regulations), will furnish
the Underwriters with copies of any such amendment or supplement a reasonable
amount of time prior to such proposed filing or use, as the case may be, and
will not file any such amendment or supplement or use any such prospectus to
which counsel for the Underwriters shall reasonably object. 

         (d) The Company will deliver to each of the Underwriters a conformed
copy of the Registration Statement as originally filed and of each amendment
thereto filed prior to the termination of the initial offering of the Notes
(including exhibits filed therewith or incorporated by reference therein and the
documents incorporated by reference into the Prospectus pursuant to Item 12 of
Form S-3). 

         (e) The Company will furnish to the Underwriters, from time to time
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 the Underwriters may reasonably request for the purposes
contemplated by the 1933 Act, the 1933 Act Regulations, the 1934 Act or 1934 Act
Regulations. 

         (f) If any event shall occur as a result of which it is necessary, in
the opinion of counsel for the Underwriters, to amend or supplement the
Prospectus in order to make the Prospectus not misleading in the light of the
circumstances existing at the time it is delivered, the Company will either (i)
forthwith prepare and furnish to the Underwriters an amendment of or supplement
to the Prospectus or (ii) make an appropriate filing pursuant to Section 13, 14
or 15 of the 1934 Act, in form and substance reasonably satisfactory to counsel
for the Underwriters, which will amend or supplement the Prospectus so that it
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 existing at the time it is delivered, not misleading. 

         (g) The Company will endeavor in good faith, in cooperation with the
Underwriters, to qualify the Notes for offering and sale under the applicable
securities laws and real estate syndication laws of such states and other
jurisdictions of the United States as the Underwriters 



                                       12
<PAGE>

may designate; provided that, in connection therewith, the Company shall not be
required to qualify as a foreign corporation or trust or to file any general
consent to service of process. In each jurisdiction in which the Notes have been
so qualified the Company will file such statements and reports as may be
required by the laws of such jurisdiction to continue such qualification in
effect for so long as required for the distribution of the Notes. 

         (h) The Company will make generally available to its security holders
as soon as reasonably practicable, but not later than 90 days after the close of
the period covered thereby, an earning statement of the Company (in form
complying with the provisions of Rule 158 of the 1933 Act Regulations) covering
a period of at least twelve months beginning not later than the first day of the
Company's fiscal quarter next following the effective date of the Registration
Statement. "Earning statement", "make generally available" and "effective date"
will have the meanings contained in Rule 158 of the 1933 Act Regulations. 

         (i) The Company will use the net proceeds received by it from the sale
of the Notes in the manner specified in the Prospectus under the caption "Use of
Proceeds" in all material respects. 

         (j) The Company currently intends to continue to elect to qualify as a
"real estate investment trust" under the Code, and use its best efforts to
continue to meet the requirements to qualify as a "real estate investment
trust".

         (k) The Company will timely file any document which it is required to
file pursuant to the 1934 Act prior to the termination of the offering of the
Notes. 

         (l) The Company will not, between the date of this Agreement and the
termination of any trading restrictions or Closing Time, whichever is later,
with respect to the Notes, without your prior written consent, offer or sell,
grant any option for the sale of, or enter into any agreement to sell, any debt
securities of the Company with a maturity of more than one year (other than the
Notes which are to be sold pursuant to this Agreement and additional or expanded
commitments to participate in the Company's revolving line of credit) except as
may otherwise be provided in this Agreement. 

         Section 4. Payment of Expenses. The Company will pay all expenses
incident to the performance of its obligations under this Agreement, including
(i) the preparation and filing of the Registration Statement as originally filed
and of each amendment thereto, (ii) the preparation and filing of this
Agreement, (iii) the preparation, issuance and delivery of the Notes to the
Underwriters, (iv) the fees and disbursements of counsel for the Company,
referred to in Section 5(b) hereof, and the Company's accountants, (v) the
qualification of the Notes under securities laws and real estate syndication
laws in accordance with the provisions of Section 3(g) hereof, including filing
fees and the fee and disbursements of counsel for the Company in connection
therewith and in connection with the preparation of any Blue Sky Survey, (vi)
the printing and delivery to the Underwriters of copies of the Registration
Statement as originally filed and of each amendment thereto, and of the
Prospectus and any amendments or supplements thereto, (vii) any fees charged by
nationally recognized statistical rating organizations for the rating of the
Notes, (viii) the cost of printing or reproducing and delivering to the
Underwriters copies of 




                                       13
<PAGE>

any Blue Sky Survey, (ix) the cost of providing any CUSIP or other
identification numbers for the Notes, and (x) the fees and expenses of any
depositary in connection with the Notes.

        If this Agreement is terminated by the Underwriters in accordance with
the provisions of Section 5 or Section 9(a)(i), the Company 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 the Underwriters' Obligations. The obligations
of the Underwriters hereunder are subject to the accuracy of the representations
and warranties of the Company herein contained, to the performance by the
Company of its obligations hereunder, and to the following further conditions:

         (a) 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. The price of the Notes and
any other information previously omitted from the effective Registration
Statement pursuant to Rule 415 of the 1933 Act Regulations shall have been
transmitted to the Commission for filing pursuant to Rule 424(b) of the 1933 Act
Regulations within the prescribed time period, and prior to Closing Time the
Company shall have provided evidence satisfactory to the Underwriters of such
timely filing, or a post-effective amendment providing such information shall
have been filed and declared effective in accordance with the requirements of
the 1933 Act Regulations.

         (b) At Closing Time the Underwriters shall have received the favorable
opinion, dated as of Closing Time, of Sullivan & Worcester LLP, counsel for the
Company, in form and substance satisfactory to counsel for the Underwriters, to
the effect that: 

               (i) The Company is a Maryland real estate investment trust duly
          organized, validly existing and in good standing under the laws of the
          State of Maryland; each of its Significant Subsidiaries (as defined in
          Rule 1-02 of Regulation S-X under the 1933 Act) has been duly
          organized, is validly existing as a corporation or trust in good
          standing under the laws of its jurisdiction of incorporation or
          organization; each of the Company and its subsidiaries has the trust
          or corporate (as applicable) power and authority to carry on its
          business as described in the Registration Statement and in the
          Prospectus and to own, lease and operate its properties; each of the
          Company and its subsidiaries is duly qualified and is in good standing
          as a foreign corporation or trust, as the case may be, authorized to
          do business in each jurisdiction in which its ownership or leasing of
          property requires such qualification, except where the failure to be
          so qualified would not have a material adverse effect on the Company
          and its subsidiaries, taken as a whole.

               (ii) All of the issued and outstanding shares of beneficial
          interest of, or other ownership interests in, each of the Company's
          subsidiaries have been duly authorized and validly issued and are
          fully paid and, except as to subsidiaries that are partnerships,
          non-assessable, and are owned by the Company free and clear of any
          security interest or other adverse interest (within the meaning of
          Article 8 of the Massachusetts Uniform Commercial Code). 



                                       14
<PAGE>

               (iii) The Company has the requisite trust power and authority to
          enter into and perform this Agreement and to issue and deliver the
          Notes. 

               (iv) This Agreement and the Indenture have been duly authorized,
          executed and delivered by the Company. 

               (v) The Indenture is a valid and binding obligation of the
          Company enforceable in accordance with its terms, subject to
          applicable bankruptcy, insolvency, reorganization, moratorium and
          similar laws affecting creditors' rights generally and equitable
          principles; and the Indenture has been duly qualified under the 1939
          Act. 

               (vi) The Notes have been duly authorized and, when executed and
          authenticated in accordance with the provisions of the Indenture and
          delivered and paid for in accordance with the terms of this Agreement,
          will be valid and binding obligations of the Company enforceable in
          accordance with their terms subject to applicable bankruptcy,
          insolvency, reorganization, moratorium and similar laws affecting
          creditors' rights generally and equitable principles; and the holders
          of the Notes are entitled to the benefit of the Indenture. 

               (vii) The execution, delivery and performance of this Agreement,
          and the consummation of the transactions herein contemplated will not
          conflict with or constitute a breach or violation of any of the terms
          or provisions of, or constitute a default under, (A) the Declaration
          of Trust or the By-laws of the Company or the charter or by-laws or
          other organizational documents of any Significant Subsidiary of the
          Company, (B) except as disclosed in the Prospectus, any material
          agreement, indenture or other instrument to which the Company, or any
          of its Significant Subsidiaries or their respective material
          properties or assets is bound, or (C) any laws, administrative
          regulations or rulings or decrees known to such counsel to which the
          Company, any of its Significant Subsidiaries or their respective
          material properties or assets may be subject. 

               (viii) No consent, approval, authorization, order, registration,
          filing, qualification, license or permit of or with any federal,
          Massachusetts or Maryland court or public, governmental or regulatory
          agency or body having jurisdiction over the Company or any of its
          Significant Subsidiaries or any of their respective material
          properties or assets is required for the Company's execution, delivery
          and performance of this Agreement and the consummation of the
          transactions contemplated hereby, including, without limitation, the
          issuance, sale and delivery of the Notes pursuant to this Agreement,
          except such as have been obtained and such as may be required under
          foreign and state securities or "Blue Sky" laws. 

               (ix) The Registration Statement has become effective under the
          1933 Act, and, to the knowledge of such counsel, no stop order
          suspending the effectiveness of the Registration Statement is in
          effect, and no proceedings for such purpose are pending before or
          threatened by the Commission; and any required filing of the
          Prospectus pursuant to Rule 424 under the 1933 Act has been made in
          accordance with said Rule 424. 




                                       15
<PAGE>

               (x) To such counsel's knowledge, except as disclosed in the
          Registration Statement or in the Prospectus, there is not now pending
          or threatened, any litigation, action, suit or proceeding to which the
          Company or any of its subsidiaries is or will be a party before or by
          any court or governmental agency or body, which (A) might result in
          any material adverse change in the condition, financial or otherwise,
          or in the business, operations, earnings, prospects or properties of
          the Company and its subsidiaries, taken as a whole, or (B) might
          materially and adversely affect the property or assets of the Company
          and its subsidiaries, taken as a whole, or (C) concerns the Company or
          any of its subsidiaries and is required to be disclosed in the
          Prospectus, or (D) could adversely affect the consummation of this
          Agreement and the issuance of the Notes; to such counsel's knowledge,
          no contract or other document is required to be described in the
          Registration Statement or in the Prospectus or to be filed as an
          exhibit to the Registration Statement that is not described therein or
          filed as required. 

               (xi) Except as otherwise disclosed in the Prospectus, to such
          counsel's knowledge, neither the Company nor any of its subsidiaries
          is in violation of its respective charter or by-laws or other
          organizational documents or in default in the performance of any
          obligation, agreement or condition contained in any bond, debenture,
          note or any other evidence of indebtedness or in any other material
          agreement, indenture or instrument to which the Company or any of its
          subsidiaries is a party or by which any of their respective properties
          or assets may be bound or affected, except for any such violation that
          would not have a material adverse effect on the business, operations,
          earnings, business prospects, properties or condition (financial or
          otherwise) of the Company and its subsidiaries taken as a whole. 

               (xii) To such counsel's knowledge, each of the Company and its
          subsidiaries has such permits, licenses, franchises and authorizations
          of governmental or regulatory authorities (together, "permits"),
          including, without limitation, under any applicable Environmental Law,
          as are necessary to own, lease and operate its properties and to
          engage in the business currently conducted by it, except such licenses
          and permits as to which the failure to own or possess will not in the
          aggregate have a material adverse effect on the business, operations,
          earnings, business prospects, properties or condition (financial or
          otherwise) of the Company and its subsidiaries, taken as a whole.


               (xiii) The Registration Statement and the Prospectus and any
          supplements or amendments thereto (except for the financial statements
          and the notes thereto and the schedules and other financial and
          statistical data included therein, the Excluded Proceedings (as
          defined in paragraph (xx) below) and the part of the Registration
          Statement that constitutes the Statement of Eligibility (Form T-1) of
          the Trustee under the 1939 Act, as to which such counsel need not
          express any opinion) comply as to form in all material respects with
          the requirements of the 1933 Act. 

               (xiv) Each document incorporated by reference in the Registration
          Statement and in the Prospectus (except for the financial statements
          and the notes thereto and the schedules and other financial and
          statistical data included therein and the Excluded Proceedings, as to
          which such counsel need not express any opinion) complied as to form




                                       16
<PAGE>

          when filed with the Commission in all material respects with the
          requirements of the 1934 Act. 

               (xv) To the extent required to be described therein, the Notes
          conform in all material respects to the descriptions in the
          Registration Statement and the Prospectus. 

               (xvi) The statements (a) in the Prospectus under the captions
          "Description of Debt Securities", "Description of the Notes",
          "Description of Shares", "Redemption; Business Combinations and
          Control Share Acquisitions," "Limitation of Liability; Shareholder
          Liability" and "Federal Income Tax and ERISA Considerations" and (b)
          in Item 1 of the Company's Annual Report on Form 10-K for the fiscal
          year ended December 31, 1997 under the captions "Regulation and
          Reimbursement," "Federal Income Tax Considerations" and "ERISA Plans,
          Keogh Plans and Individual Retirement Accounts" in each case insofar
          as they purport to summarize matters arising under Massachusetts or
          Maryland law or the federal law of the United States, or provisions of
          documents to which the Company is a party specifically referred to
          therein, are accurate summaries of such legal matters or provisions.

               (xvii) The Company has qualified to be taxed as a real estate
          investment trust pursuant to Sections 856-860 of the Code for each of
          the fiscal years ended December 31, 1987 through December 31, 1997,
          and the Company's current anticipated investments and its current plan
          of operation will enable it to continue to meet the requirements for
          qualification and taxation as a real estate investment trust under the
          Code; actual qualification of the Company as a real estate investment
          trust, however, will depend upon the Company's continued ability to
          meet, and its meeting, through actual annual operating results and
          distributions, the various qualification tests imposed under the Code.

               (xviii) The Company is not required to register as an "investment
          company" within the meaning of the 1940 Act. 

               (xix) The Advisor (A) is a corporation duly organized, validly
          existing and in good standing under the laws of the State of Delaware,
          and (B) has the requisite corporate power and authority to conduct its
          business as described in the Prospectus and to own and operate its
          material properties. 

               (xx) The Advisory Agreement has been duly authorized, executed
          and delivered by the parties thereto and constitutes the valid
          agreement of the parties thereto, enforceable in accordance with its
          terms, except (a) as limited by the effect of bankruptcy, insolvency,
          reorganization, fraudulent transfer, moratorium or other similar laws
          relating to or affecting the rights or remedies of creditors, (b) as
          limited by the effect of general principles of equity (regardless of
          whether enforcement is sought in a proceeding in equity or at law) and
          (c) insofar as the enforceability of the indemnity and contribution
          provisions contained in such agreement may be limited by federal or
          state securities laws and the public policy underlying such laws.




                                       17
<PAGE>

               (xxi) Although counsel has not undertaken, except as otherwise
          indicated in their opinion, to determine independently, and does not
          assume any responsibility for, the accuracy or completeness of the
          statements in the Registration Statement, such counsel has
          participated in the preparation of the Registration Statement and the
          Prospectus, including review and discussion of the contents thereof
          (including review and discussion of the contents of all documents
          incorporated by reference in the Registration Statement and the
          Prospectus), and nothing has come to the attention of such counsel
          that has caused them to believe that the Registration Statement
          (including the documents incorporated by reference therein) at the
          time the Registration Statement became effective, or the Prospectus,
          as of its date and as of Closing Time, as the case may be, 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 any amendment or supplement to the
          Prospectus, as of its respective date, and as of Closing Time, as the
          case may be, contained any untrue statement of a material fact or
          omitted 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 (it being understood that such counsel need
          express no view with respect to (a) the financial statements and the
          notes thereto and the schedules and other financial and statistical
          data included or incorporated by reference in the Registration
          Statement or in the Prospectus or (b) the proceedings referred to in
          Item 3 of the Company's Annual Report on Form 10-K for the fiscal
          year ended December 31, 1997 under the caption "Legal Proceedings" and
          any claims related thereto (collectively, the "Excluded Proceedings"),
          or (c) the part of the Registration Statement that constitutes the
          Statement of Eligibility (Form T-1) of the Trustee under the 1939 Act.

         In rendering their opinion as aforesaid, Sullivan & Worcester LLP may
rely upon an opinion, dated as of Closing Time, of Piper & Marbury L.L.P. as to
matters governed by Maryland law, provided that such reliance is expressly
authorized by such opinion and a copy of such opinion is delivered to the
Underwriters and is, in form and substance, satisfactory to the Underwriters and
counsel for the Underwriters. In addition, in rendering such opinion, such
counsel may state that their opinion as to laws of the State of Delaware is
limited to the Delaware General Corporation Law and that their opinion with
respect to the qualification of the Company and its subsidiaries to do business
in jurisdictions other than their respective jurisdictions of organization is
based solely upon certificates to such effect issued by an appropriate official
of the applicable jurisdictions.

         The opinion of Piper & Marbury L.L.P. described in the paragraph above
shall be rendered to the Underwriters at the request of the Company and shall so
state therein.

        In addition, the Underwriters shall have received at Closing Time an
opinion (satisfactory to the Underwriters and counsel for the Underwriters) of
Sherin & Lodgen LLP, special counsel for the Company, dated as of Closing Time,
to the effect that the statements describing the proceedings in Item 3 of the
Company's Annual Report on Form 10-K for the fiscal year ended December 31, 1997
under the caption "Legal Proceedings", insofar as they purport to summarize
legal proceedings, constitute a fair summary of such legal proceedings.



                                       18
<PAGE>

         (c) The Underwriters shall have received at Closing Time an opinion,
dated as of Closing Time, of Brown & Wood LLP, counsel for the Underwriters, as
to the matters referred to in clauses (iv), (v), (vi), (ix), (xiii), (xv) and
(xxi) of the foregoing paragraph (b). In giving such opinion with respect to the
matters covered by clause (xxi), such counsel may state that their opinion and
belief are based upon their participation in the preparation of the Registration
Statement and the Prospectus and any amendments or supplements thereto and
review and discussion of the contents thereof, but are without independent check
or verification except as specified.

        In rendering their opinion as aforesaid, Brown & Wood LLP may rely upon
an opinion, dated as of Closing Time, of Piper & Marbury L.L P. as to matters
governed by Maryland law, and the opinion of Sullivan & Worcester LLP referred
to above as to matters governed by Massachusetts law. In addition, in rendering
such opinion, such counsel may state that their opinion as to laws of the State
of Delaware is limited to the Delaware General Corporation Law.

         (d) At Closing Time (i) the Registration Statement and the Prospectus
shall contain all statements which are required to be stated therein in
accordance with the 1933 Act and the 1933 Act Regulations and in all material
respects shall conform to the requirements of the 1933 Act and the 1933 Act
Regulations, and neither the Registration Statement nor the Prospectus shall
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein
not misleading and no action, suit or proceeding at law or in equity shall be
pending or to the knowledge of the Company threatened against the Company which
would be required to be set forth in the Prospectus other than as set forth
therein, (ii) there shall not have been, since the respective dates as of which
information is given in the Registration Statement and the Prospectus, any
material adverse change in the condition, financial or otherwise, of the Company
or in its earnings, business affairs or business prospects, whether or not
arising in the ordinary course of business from that set forth in the
Registration Statement, and (iii) no proceedings shall be pending or, to the
knowledge of the Company, threatened against the Company before or by any
federal, state or other commission, board or administrative agency wherein an
unfavorable decision, ruling or finding would materially and adversely affect
the business, property, financial condition or income of the Company other than
as set forth in the Prospectus; and the Underwriters shall have received, at
Closing Time, a certificate of the President and Chief Operating Officer and the
chief financial officer of the Company, dated as of Closing Time, evidencing
compliance with the provisions of this subsection (d) and stating that the
representations and warranties set forth in Section 1(a) hereof are accurate as
though expressly made at and as of Closing Time.

         (e) At Closing Time, there shall not have been, since the respective
dates as of which information is given in the Registration Statement and the
Prospectus, any material adverse change in the business, operations, earnings,
prospects, properties or condition (financial or otherwise) of the Advisor,
whether or not arising in the ordinary course of business; and the Underwriters
shall have received, at Closing Time, a certificate of the President of the
Advisor evidencing compliance with this subsection (e).

         (f) Concurrently with the execution and delivery of this Agreement, and
at Closing Time prior to payment and delivery of the Notes, Ernst & Young LLP
shall have furnished to the Underwriters a letter, dated the date of its
delivery, addressed to the Underwriters and in form 



                                       19
<PAGE>

and substance satisfactory to the Underwriters, confirming that they are
independent accountants with respect to the Company as required by the 1933 Act
and the 1933 Act Regulations and with respect to the financial and other
statistical and numerical information contained in the Registration Statement
and the Prospectus or incorporated by reference therein. Each such letter shall
contain information of the type customarily included in accountants' comfort
letters to underwriters.

         (g) At Closing Time counsel for the Underwriters shall have been
furnished with such documents and opinions as they may reasonably require for
the purpose of enabling them to pass upon the issuance and sale of the Notes as
herein contemplated and related proceedings, 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 Company in
connection with the issuance and sale of the Notes as herein contemplated shall
be reasonably satisfactory in form and substance to the Underwriters and counsel
for the Underwriters. 

         (h) In the event the Underwriters exercise the option described in
Section 2 hereof to purchase all or any portion of the Option Notes, the
representations and warranties of the Company included herein and the statements
in any certificates furnished by the Company hereunder shall be true and correct
as of the Date of Delivery, and the Underwriters shall have received:

               (i) A certificate of the President and Chief Executive Officer
          and the chief financial officer or chief accounting officer of the
          Company, dated such Date of Delivery, confirming that their
          certificate delivered at Closing Time pursuant to Section 5(d) hereof
          remains true as of such Date of Delivery.

               (ii) The favorable opinion of Sullivan & Worcester LLP, counsel
          for the Company, in form and substance satisfactory to counsel for the
          Underwriters, dated such Date of Delivery, relating to the Option
          Notes and otherwise to the same effect as the opinion required by
          Section 5(b) hereof.

               (iii) Certificate of the President of the Advisor confirming that
          his certificate delivered at Closing Time pursuant to Section 5(e)
          hereof remains true as of such Date of Delivery.

               (iv) The favorable opinion of Brown & Wood LLP, counsel for the
          Underwriters, dated such Date of Delivery, relating to the Option
          shares and otherwise to the same effect as the opinion required by
          Section 5(c) hereof.

               (v) A letter from Ernst & Young LLP, dated such Date of Delivery,
          substantially the same in scope and substance as the letter furnished
          to the Underwriters pursuant to Section 5(f) hereof.

         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 the Underwriters by notice to the Company at any time at or prior to Closing
Time, and such termination shall be without liability of any party to any other
party except as provided in Section 4 hereof.


                                       20
<PAGE>

         Section 6. Indemnification. (a) The Company hereby agrees to indemnify
and hold harmless each Underwriter and each person, if any, who controls each
Underwriter within the meaning of Section 15 of the 1933 Act as follows:

               (1) 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 included in any preliminary prospectus or 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:

               (2) 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, if such settlement is effected with the written consent of
          the Company; and 

               (3) against any and all expense whatsoever, as incurred
          (including, subject to Section 6(c) hereof, the fees and disbursements
          of counsel chosen by Merrill Lynch), reasonably incurred in
          investigating, preparing or defending against any litigation, or any
          investigation or proceedings 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
          paragraph (1) or (2) above; 

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 Company by any
Underwriter through Merrill Lynch expressly for use in the Registration
Statement (or any amendment thereto) or the Prospectus (or any amendment or
supplement thereto); and provided, further, that the foregoing indemnity
agreement with respect to any preliminary prospectus shall not inure to the
benefit of any Underwriter, or the benefit of any person controlling any
Underwriter, if a copy of the Prospectus (as then amended or supplemented if the
Company shall have furnished any amendments or supplements thereto and excluding
documents incorporated or deemed to be incorporated by reference therein) was
not sent or given by or on behalf of such Underwriter to such person asserting
any such losses, claims, damages or liabilities at or prior to the written
confirmation of the sale of such Notes to such person, if required by law so to
have been delivered, and if the Prospectus (as so amended or supplemented) would
have cured the defect giving rise to such loss, claim, damage or expense.



                                       21
<PAGE>

         (b) Each Underwriter agrees to indemnify and hold harmless the Company,
each of the Company's trustees, each of the Company's officers who signed the
Registration Statement and each person, if any, who controls the Company within
the meaning of Section 15 of the 1933 Act 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 the Prospectus (or any amendment or
supplement thereto) in reliance upon and in conformity with written information
furnished to the Company by any Underwriter through Merrill Lynch expressly for
use in the Registration Statement (or any amendment thereto) or the Prospectus
(or any amendment or supplement thereto).

         (c) 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
which it may have otherwise than on account of this indemnity agreement. An
indemnifying party may participate at its own expense in the defense of such
action. 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. 

         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 Company and the
Underwriters shall contribute to the aggregate losses, liabilities, claims,
damages and expenses of the nature contemplated by said indemnity agreement
incurred by the Company and the Underwriters, as incurred, (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Company on the one hand and the Underwriters on the other hand from the offering
of the Notes pursuant to this Agreement or (ii) if the allocation provided by
clause (i) is not permitted by applicable law, in such proportion as is
appropriate to reflect not only the relative benefits referred to in clause (i)
above but also the relative fault of the Company on the one hand and of the
Underwriters on the other hand in connection with the statements or omissions
which resulted in such losses, liabilities, claims, damages or expenses, as well
as any other relevant equitable considerations.

         The relative benefits received by the Company on the one hand and the
Underwriters on the other hand in connection with the offering of the Notes
pursuant to this Agreement shall be deemed to be in the same respective
proportions as the total net proceeds from the offering of the Notes pursuant to
this Agreement (before deducting expenses) received by the Company and the total
discount received by the Underwriters, bear to the aggregate initial offering
price of the Notes.

         The relative fault of the Company on the one hand and the Underwriters
on the other hand shall be determined by reference to, among other things,
whether any such untrue or alleged untrue statement of a material fact or
omission or alleged omission to state a material fact relates to information
supplied by the Company or by the Underwriters and the parties' relative 




                                       22
<PAGE>

intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission.

        The Company and the Underwriters agree that it would not be just and
equitable if contribution pursuant to this Section 7 were determined by pro rata
allocation or by any other method of allocation which does not take into account
the equitable considerations referred to above in this Section 7. The aggregate
amount of losses, liabilities, claims, damages and expenses incurred by an
indemnified party and referred to above in this Section 7 shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party 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 or alleged untrue
statement or omission or alleged omission.

        No person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the 1933 Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation. Notwithstanding the
provisions of this Section 7, the Underwriters shall not be required to
contribute any amount in excess of the amount by which the total price at which
the Notes purchased from the Company by the Underwriters and distributed to the
public were offered to the public exceeds the amount of any damages which the
Underwriters have otherwise been required to pay in respect of such losses,
liabilities, claims, damages and expenses. For purposes of this Section 7, each
person, if any, who controls any Underwriter within the meaning of Section 15 of
the 1933 Act shall have the same rights to contribution as such Underwriter, and
each trustee of the Company, each officer of the Company who signed the
Registration Statement, and each person, if any, who controls the Company within
the meaning of Section 15 of the 1933 Act shall have the same rights to
contribution as the Company.

         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 submitted pursuant
hereto, shall remain operative and in full force and effect, regardless of any
investigation made by or on behalf of the Underwriters or any controlling
person, or by or on behalf of the Company, and shall survive delivery of the
Notes to the Underwriters.

         Section 9. Termination of Agreement. (a) The Underwriters may terminate
this Agreement, by notice to the Company, at any time at or prior to Closing
Time (i) if there has been, since the respective dates as of which information
is given in the Registration Statement, any material adverse change in the
condition, financial or otherwise, or in the earnings, business affairs or
business prospects of the Company or the Advisor, whether or not arising in the
ordinary course of business, which would make it, in the Underwriters'
reasonable judgment, impracticable or inadvisable to market the Notes or enforce
contracts for the sale of the Notes, (ii) if there has occurred any material
adverse change in the financial markets in the United States or any outbreak of
hostilities or escalation of existing hostilities or other calamity or crisis
the effect of which on the financial markets of the United States is such as to
make it, in the Underwriters' reasonable judgment, impracticable or inadvisable
to market the Notes or enforce contracts for the sale of the Notes, or (iii) if
trading in the Company's Common Shares has been suspended by the Commission, or
if trading generally on either the New York Stock Exchange or the American Stock
Exchange has been suspended, or minimum or maximum prices for trading 



                                       23
<PAGE>

have been fixed, or maximum ranges for prices for securities have been required,
by either of said exchanges or by order of the Commission or any other
governmental authority, or if a banking moratorium has been declared by Federal
or New York 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 Section 4, and provided further that Sections 6 and 7 hereof shall
survive such termination.

         Section 10. Default. If one or more of the Underwriters shall fail at
Closing Time to purchase the Notes which it or they are obligated to purchase
under this Agreement (the "Defaulted Notes"), the Underwriters 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 Notes in such amounts as may be agreed upon and
upon the terms herein set forth; if, however, the Underwriters shall not have
completed such arrangements within such 24-hour period, then:

               (i) if the total principal amount of Defaulted Notes does not
          exceed 10% of the Initial Notes to be purchased pursuant to this
          Agreement, the non-defaulting Underwriters shall be obligated to
          purchase the full amount thereof in the proportions that their
          respective underwriting obligations hereunder bear to the underwriting
          obligations of all non-defaulting Underwriters, or

               (ii) if the total principal amount of Defaulted Notes exceeds 10%
          of the Initial Notes to be purchased pursuant to this Agreement, this
          Agreement shall terminate without liability on the part of any
          non-defaulting Underwriter and the Company. 

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

         In the event of any such default which does not result in a termination
of this Agreement, either the Underwriters or the Company shall have the right
to postpone Closing Time for a period not exceeding seven days in order to
effect any required changes in the Prospectus or in any other documents or
arrangements.

         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 Underwriters in c/o Merrill Lynch, Pierce,
Fenner & Smith Incorporated at World Financial Center, North Tower, 250 Vesey
Street, New York, NY 10281-1326, Attention: Tjarda van S. Clagett, Director; and
notices to the Company shall be directed to it at 400 Centre Street, Newton,
Massachusetts 02158, Attention: David J. Hegarty, President.

         Section 12. Parties. This Agreement shall inure to the benefit of and
be binding upon the Underwriters and the Company 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 those
referred to in Sections 6 and 7 and their 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 



                                       24
<PAGE>

hereof are intended to be for the sole and exclusive benefit of the parties
hereto and thereto and their respective successors and said controlling persons
and officers, trustees and directors and their heirs and legal representatives,
and for the benefit of no other person, firm or corporation. No purchaser of
Notes from any Underwriter shall be deemed to be a successor by reason merely of
such purchase. 

         Section 13. Governing Law and Time; Miscellaneous. 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. 

         THE AMENDED AND RESTATED DECLARATION OF TRUST ESTABLISHING THE COMPANY,
DATED JULY 1, 1994, A COPY OF WHICH, TOGETHER WITH ALL AMENDMENTS THERETO (THE
"DECLARATION"), IS DULY FILED IN THE OFFICE OF THE STATE DEPARTMENT OF
ASSESSMENTS AND TAXATION OF MARYLAND, PROVIDES THAT THE NAME "HRPT PROPERTIES
TRUST" REFERS TO THE TRUSTEES UNDER THE DECLARATION COLLECTIVELY AS TRUSTEES,
BUT NOT INDIVIDUALLY OR PERSONALLY, AND THAT NO TRUSTEE, OFFICER, SHAREHOLDER,
EMPLOYEE OR AGENT OF THE COMPANY SHALL BE HELD TO ANY PERSONAL LIABILITY,
JOINTLY OR SEVERALLY, FOR ANY OBLIGATION OF, OR CLAIM AGAINST, THE COMPANY. ALL
PERSONS DEALING WITH THE COMPANY, IN ANY WAY, SHALL LOOK ONLY TO THE ASSETS OF
THE COMPANY FOR THE PAYMENT OF ANY SUM OR THE PERFORMANCE OF ANY OBLIGATION.



                                       25
<PAGE>

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

                                      Very truly yours,

                                      HRPT PROPERTIES TRUST



                                      By /s/ Ajay Saini
                                         --------------------------------
                                         Name:  Ajay Saini
                                         Title: Treasurer and Chief
                                                Financial Officer



CONFIRMED AND ACCEPTED, as of
the date first above written:

MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
            INCORPORATED
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
A.G. EDWARDS & SONS, INC.
LEGG MASON WOOD WALKER, INCORPORATED
MORGAN STANLEY & CO. INCORPORATED
PAINEWEBBER INCORPORATED
PRUDENTIAL SECURITIES INCORPORATED
SALOMON SMITH BARNEY INC.

By:     MERRILL LYNCH & CO.
        Merrill Lynch, Pierce, Fenner & Smith
                    Incorporated



By /s/ Elizabeth Anne Casey
   ----------------------------------
   Name:  Elizabeth Anne Casey
   Title: Vice President

   Acting on behalf of themselves and
   the other named Underwriters in Schedule A




                                       26

<PAGE>


                                   SCHEDULE A

<TABLE>
<CAPTION>
                                                             Aggregate Principal    
            Underwriter                                    Amount of Initial Notes  
            -----------                                    -----------------------  
                                                             
<S>                                                             <C>       
Merrill Lynch, Pierce, Fenner & Smith
            Incorporated...................................     $ 16,250,000
Donaldson, Lufkin and Jenrette Securities Corporation......       16,250,000
A.G. Edwards & Sons, Inc...................................       16,250,000
Legg Mason Wood Walker, Incorporated.......................       16,250,000
Morgan Stanley & Co. Incorporated..........................       16,250,000
PaineWebber Incorporated...................................       16,250,000
Prudential Securities Incorporated.........................       16,250,000
Salomon Smith Barney Inc...................................       16,250,000
                                                                 -----------
            Total..........................................     $130,000,000
                                                                 ===========
</TABLE>




                          SUPPLEMENTAL INDENTURE NO. 5

                                 by and between

                              HRPT PROPERTIES TRUST

                                       and

                       STATE STREET BANK AND TRUST COMPANY

                             as of November 30, 1998




             SUPPLEMENTAL TO THE INDENTURE DATED AS OF JULY 9, 1997




                      ------------------------------------





                              HRPT PROPERTIES TRUST
                   8 1/2% Monthly Income Senior Notes due 2013


<PAGE>



         This SUPPLEMENTAL INDENTURE NO. 5 (this "Supplemental Indenture") made
and entered into as of November 30, 1998 between HRPT PROPERTIES TRUST, a
Maryland real estate investment trust (the "Company"), and STATE STREET BANK AND
TRUST COMPANY, a Massachusetts trust company, as Trustee (the "Trustee").

                                WITNESSETH THAT:

         WHEREAS, the Company and the Trustee have executed and delivered an
Indenture, dated as of July 9, 1997 (the "Indenture"), relating to the Company's
issuance, from time to time, of various series of debt securities; and

         WHEREAS, the Company has determined to issue debt securities known as
its 8 1/2% Monthly Income Senior Notes due 2013; and

         WHEREAS, the Indenture provides that certain terms and conditions for
each series of debt securities issued by the Company thereunder may be set forth
in an indenture supplemental to the Indenture;

         NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH:

                                    ARTICLE 1

                                  DEFINED TERMS

         Section 1.1 The following definitions supplement, and, to the extent
inconsistent with, replace the definitions in Section 101 of the Indenture:

         "Acquired Debt" means Debt of a Person (i) existing at the time such
Person becomes a Subsidiary or (ii) assumed in connection with the acquisition
of assets from such Person, in each case, other than Debt incurred in connection
with, or in contemplation of, such Person's becoming a Subsidiary or such
acquisition. Acquired Debt shall be deemed to be incurred on the date of the
related acquisition of assets from any Person or the date the acquired Person
becomes a Subsidiary.

         "Annual Debt Service" as of any date means the maximum amount which is
expensed in any 12-month period for interest on Debt of the Company and its
Subsidiaries.

         "Business Day" means any day other than a Saturday or Sunday or a day
on which banking institutions in The City of New York or in the city in which
the Corporate Trust Office of the Trustee is located, are required or authorized
to close.

         "Capital Stock" means, with respect to any Person, any capital stock
(including preferred stock), shares, interests, participation or other ownership
interests (however designated) of such Person and any rights (other than debt
securities convertible into or exchangeable for capital stock), warrants or
options to purchase any thereof.

         "Consolidated Income Available for Debt Service" for any period means
Earnings from Operations of the Company and its Subsidiaries plus amounts which
have been deducted, and minus amounts which have been added, for the following
(without duplication): (i) interest on Debt of the Company and its Subsidiaries,
(ii) provision for taxes of the Company and its Subsidiaries based on income,
(iii) amortization of debt discount and deferred financing costs, (iv)
provisions for gains and losses on properties and property depreciation and
amortization, (v) the effect of any noncash charge resulting from a change in
accounting


<PAGE>



principles in determining Earnings from Operations for such period and (vi)
amortization of deferred charges.

         "Debt" of the Company or any Subsidiary means, without duplication, any
indebtedness of the Company or any Subsidiary, whether or not contingent, in
respect of (i) borrowed money or evidenced by bonds, notes, debentures or
similar instruments, (ii) indebtedness for borrowed money secured by any
Encumbrance existing on property owned by the Company or any Subsidiary, to the
extent of the lesser of (x) the amount of indebtedness so secured and (y) the
fair market value of the property subject to such Encumbrance, (iii) the
reimbursement obligations, contingent or otherwise, in connection with any
letters of credit actually issued (other than letters of credit issued to
provide credit enhancement or support with respect to other indebtedness of the
Company or any Subsidiary otherwise reflected as Debt hereunder) or amounts
representing the balance deferred and unpaid of the purchase price of any
property or services, except any such balance that constitutes an accrued
expense or trade payable, or all conditional sale obligations or obligations
under any title retention agreement, (iv) the principal amount of all
obligations of the Company or any Subsidiary with respect to redemption,
repayment or other repurchase of any Disqualified Stock, or (v) any lease of
property by the Company or any Subsidiary as lessee which is reflected on the
Company's consolidated balance sheet as a capitalized lease in accordance with
GAAP, to the extent, in the case of items of indebtedness under (i) through
(iii) above, that any such items (other than letters of credit) would appear as
a liability on the Company's consolidated balance sheet in accordance with GAAP,
and also includes, to the extent not otherwise included, any obligation by the
Company or any Subsidiary to be liable for, or to pay, as obligor, guarantor or
otherwise (other than for purposes of collection in the ordinary course of
business), Debt of another Person (other than the Company or any Subsidiary) (it
being understood that Debt shall be deemed to be incurred by the Company or any
Subsidiary whenever the Company or such Subsidiary shall create, assume,
guarantee or otherwise become liable in respect thereof).

         "Disqualified Stock" means, with respect to any Person, any Capital
Stock of such Person which by the terms of such Capital Stock (or by the terms
of any security into which it is convertible or for which it is exchangeable or
exercisable), upon the happening of any event or otherwise (i) matures or is
mandatorily redeemable, pursuant to a sinking fund obligation or otherwise
(other than Capital Stock which is redeemable solely in exchange for common
stock or shares), (ii) is convertible into or exchangeable or exercisable for
Debt or Disqualified Stock, or (iii) is redeemable at the option of the holder
thereof, in whole or in part (other than Capital Stock which is redeemable
solely in exchange for common stock or shares), in each case on or prior to the
Stated Maturity of the Notes.

         "Earnings from Operations" for any period means net earnings excluding
gains and losses on sales of investments, extraordinary items and property
valuation losses, as reflected in the financial statements of the Company and
its Subsidiaries for such period, determined on a consolidated basis in
accordance with GAAP.

         "Encumbrance" means any mortgage, lien, charge, pledge or security
interest of any kind.

         "Notes" means the Company's 8 1/2% Monthly Income Senior Notes, due
2013, issued under this Indenture, as amended or supplemented from time to time.

         "Secured Debt" means Debt secured by any mortgage, lien, charge, pledge
or security interest of any kind.

         "Subsidiary" means any corporation or other entity of which a majority
of (i) the voting power of the voting equity securities or (ii) the outstanding
equity interests of which are owned, directly or indirectly, by 



                                      -2-
<PAGE>


the Company or one or more other Subsidiaries of the Company. For the purposes
of this definition, "voting equity securities" means equity securities having
voting power for the election of directors, whether at all times or only so long
as no senior class of security has such voting power by reason of any
contingency.

         "Total Assets" as of any date means the sum of (i) the Undepreciated
Real Estate Assets and (ii) all other assets of the Company and its Subsidiaries
determined in accordance with GAAP (but excluding accounts receivable and
intangibles).

         "Total Unencumbered Assets" means the sum of (i) those Undepreciated
Real Estate Assets not subject to an Encumbrance for borrowed money and (ii) all
other assets of the Company and its Subsidiaries not subject to an Encumbrance
for borrowed money determined in accordance with GAAP (but excluding accounts
receivable and intangibles).

         "Undepreciated Real Estate Assets" as of any date means the cost
(original cost plus capital improvements) of real estate assets of the Company
and its Subsidiaries on such date, before depreciation and amortization,
determined on a consolidated basis in accordance with GAAP.

         "Unsecured Debt" means Debt which is not secured by any of the
properties of the Company or any Subsidiary.


                                    ARTICLE 2

                               TERMS OF THE NOTES

         Section 2.1 Pursuant to Section 301 of the Indenture, the Notes shall
have the following terms and conditions:

         (a) Title; Aggregate Principal Amount; Form of Notes. The Notes shall
be known as the Company's 8 1/2% Monthly Income Senior Notes due 2013. The Notes
will be limited to an aggregate principal amount of $149,500,000, subject to the
right of the Company to reopen such series for issuances of additional
securities of such series, and except as provided in this Section and in Section
306 of the Indenture. The Notes (together with the Trustee's certificate of
authentication) shall be substantially in the form of Exhibit A hereto, which is
hereby incorporated in and made a part of this Supplemental Indenture.

         The Notes will be issued in the form of one or more registered global
securities without coupons (the "Global Notes") that will be deposited with, or
on behalf of, The Depository Trust Company ("DTC"), and registered in the name
of DTC's nominee, Cede & Co. Except under the circumstance described below, the
Notes will not be issuable in definitive form. Unless and until it is exchanged
in whole or in part for the individual notes represented thereby, a Global Note
may not be transferred except as a whole by DTC to a nominee of DTC or by a
nominee of DTC to DTC or another nominee of DTC or by DTC or any nominee of DTC
to a successor depositary or any nominee of such successor.

         So long as DTC or its nominee is the registered owner of a Global Note,
DTC or such nominee, as the case may be, will be considered the sole owner or
holder of the Notes represented by such Global Note for all purposes under this
Supplemental Indenture. Except as described below, owners of beneficial interest
in Notes evidenced by a Global Note will not be entitled to have any of the
individual Notes represented by such Global Note registered in their names, will
not receive or be entitled to receive physical delivery of any 




                                      -3-
<PAGE>

such Notes in definitive form and will not be considered the owners or holders
thereof under the Indenture or this Supplemental Indenture.

         If DTC is at any time unwilling, unable or ineligible to continue as
depositary and a successor depositary is not appointed by the Company within 90
days, the Company will issue individual Notes in exchange for the Global Note or
Global Notes representing such Notes and the Trustee, upon receipt of an
authentication order pursuant to Section 303 of the Indenture, shall
authenticate and deliver such Notes. In addition, the Company may at any time
and in its sole discretion, subject to certain limitations set forth in the
Indenture, determine not to have any of such Notes represented by one or more
Global Notes and in such event will issue individual Notes in exchange for the
Global Note or Notes representing the Notes. Individual Notes so issued will be
issued in such names as DTC should instruct and in denominations of $1,000 and
integral multiples thereof and will be issued in registered form only, without
coupons.

         (b) Interest and Interest Rate. The Notes will bear interest at a rate
of 8 1/2% per annum, from November 30, 1998 (or, in the case of Notes issued
upon the reopening of this series of Notes, from the date designated by the
Company in connection with such reopening) or from the immediately preceding
Interest Payment Date to which interest has been paid or duly provided for,
payable monthly in arrears on the 15th of each month, commencing January 15,
1998 (each of which shall be an "Interest Payment Date"), to the Persons in
whose names the Notes are registered in the Security Register at the close of
business on the first day of each month (whether or not a Business Day), as the
case may be, next preceding such Interest Payment Date (each, a "Regular Record
Date").

         (c) Principal Repayment; Currency. The Stated Maturity of the Notes is
November 15, 2013, provided, however, the Notes may be earlier redeemed at the
option of the Company as provided in paragraph (d) below. The principal of each
Note payable on its maturity date shall be paid against presentation and
surrender thereof at the Corporate Trust Office of the Trustee, located
initially at Two International Place, Boston, Massachusetts 02110, 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 or private debts. The Company will not pay
Additional Amounts (as defined in the Indenture) on the Notes.

         (d) Redemption at the Option of the Company; Acceleration. The Notes
may not be redeemed prior to November 15, 2003. From and after November 15,
2003, the Notes will be subject to redemption at any time at the option of the
Company, in whole or in part, upon not less than 30 nor more than 60 days'
notice to each Holder of Notes to be redeemed at its address appearing in the
Security Register, at a price equal to the principal amount of the Notes being
redeemed, plus accrued and unpaid interest to but excluding the applicable
Redemption Date. Upon the acceleration of the Notes in accordance with Section
502 of the Indenture, the principal amount of the Notes, plus accrued and unpaid
interest thereon shall become due and payable immediately.

         (e) 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 Company shall be directed
to it at 400 Centre Street, Newton, Massachusetts 02458, Attention: David J.
Hegarty, President; notices to the Trustee shall be directed to it at Two
International Place, Boston, Massachusetts 02110, Attention: Corporate Trust
Department, Re: HRPT Properties Trust 8 1/2% Monthly Income Senior Notes due
2013.

         (f) Global Note Legend. Each Global Note shall bear the following
legend on the face thereof:


                                      -4-
<PAGE>


     UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
     DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE COMPANY 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.


                                    ARTICLE 3

                              ADDITIONAL COVENANTS

         Section 3.1 In addition to the covenants of the Company set forth in
Article Ten of the Indenture, for the benefit of the holders of the Notes:

         (a) Limitations on Incurrence of Debt.

               (i) The Company will not, and will not permit any Subsidiary to,
          incur any Debt if, immediately after giving effect to the incurrence
          of such additional Debt and the application of the proceeds thereof,
          the aggregate principal amount of all outstanding Debt of the Company
          and its Subsidiaries on a consolidated basis determined in accordance
          with GAAP is greater than 60% of the sum ("Adjusted Total Assets") of
          (without duplication) (i) the Total Assets of the Company and its
          Subsidiaries as of the end of the calendar quarter covered in the
          Company's Annual Report on Form 10-K, or the Quarterly Report on Form
          10-Q, as the case may be, most recently filed with the Securities and
          Exchange Commission (or, if such filing is not permitted under the
          Securities Exchange Act of 1934, as amended, with the Trustee) prior
          to the incurrence of such additional Debt and (ii) the purchase price
          of any real estate assets or mortgages receivable acquired, and the
          amount of any securities offering proceeds received (to the extent
          that such proceeds were not used to acquire real estate assets or
          mortgages receivable or used to reduce Debt), by the Company or any
          Subsidiary since the end of such calendar quarter, including those
          proceeds obtained in connection with the incurrence of such additional
          Debt.

               (ii) In addition to the foregoing limitations on the incurrence
          of Debt, the Company will not, and will not permit any Subsidiary to,
          incur any Secured Debt if, immediately after giving effect to the
          incurrence of such additional Secured Debt and the application of the
          proceeds thereof, the aggregate principal amount of all outstanding
          Secured Debt of the Company and its Subsidiaries on a consolidated
          basis is greater than 40% of Adjusted Total Assets.

               (iii) In addition to the foregoing limitations on the incurrence
          of Debt, the Company will not, and will not permit any Subsidiary to,
          incur any Debt if the ratio of Consolidated Income Available for Debt
          Service to the Annual Debt Service for the four consecutive fiscal
          quarters most recently ended prior to the date on which such
          additional Debt is to be incurred shall have been less than 1.5x, on a
          pro forma basis after giving effect thereto and to the application of
          the proceeds therefrom, and calculated on the assumption that (i) such
          Debt and any other Debt incurred by the Company and its Subsidiaries
          since the first day of such four-quarter period and the application of
          the proceeds therefrom, including to refinance other Debt, had
          occurred at the beginning of such 




                                      -5-
<PAGE>

          period; (ii) the repayment or retirement of any other Debt by the
          Company and its Subsidiaries since the first date of such four-quarter
          period had been repaid or retired at the beginning of such period
          (except that, in making such computation, the amount of Debt under any
          revolving credit facility shall be computed based upon the average
          daily balance of such Debt during such period); (iii) in the case of
          Acquired Debt or Debt incurred in connection with any acquisition
          since the first day of such four-quarter period, the related
          acquisition had occurred as of the first day of such period with
          appropriate adjustments with respect to such acquisition being
          included in such pro forma calculation; and (iv) in the case of any
          acquisition or disposition by the Company or its Subsidiaries of any
          asset or group of assets since the first day of such four-quarter
          period, whether by merger, stock purchase or sale, or asset purchase
          or sale, such acquisition or disposition or any related repayment of
          Debt had occurred as of the first day of such period with the
          appropriate adjustments with respect to such acquisition or
          disposition being included in such pro forma calculation. If the Debt
          giving rise to the need to make the foregoing calculation or any other
          Debt incurred after the first day of the relevant four-quarter period
          bears interest at a floating rate then, for purposes of calculating
          the Annual Debt Service, the interest rate on such Debt shall be
          computed on a pro forma basis as if the average interest rate which
          would have been in effect during the entire such four-quarter period
          had been the applicable rate for the entire such period.

         (b) Maintenance of Total Unencumbered Assets. The Company and its
Subsidiaries will maintain Total Unencumbered Assets of not less than 200% of
the aggregate outstanding principal amount of the Unsecured Debt of the Company
and its Subsidiaries on a consolidated basis.

         (c) Applicability of Discharge, Defeasance and Covenant Defeasance
Provisions. The Discharge, Defeasance and Covenant Defeasance provisions in
Article Fourteen of the Indenture will apply to the Notes.

                                    ARTICLE 4

                          ADDITIONAL EVENTS OF DEFAULT

         For purposes of this Supplemental Indenture and the Notes, in addition
to the Events of Default set forth in Section 501 of the Indenture, it shall
also constitute an "Event of Default" if an event of default under any bond,
debenture, note or other evidence of indebtedness of the Company (including an
event of default with respect to any other series of securities), or under any
mortgage, indenture or other instrument of the Company under which there may be
issued or by which there may be secured or evidenced any indebtedness of the
Company (or by any Subsidiary, the repayment of which the Company has guaranteed
or for which the Company is directly responsible or liable as obligor or
guarantor), whether such indebtedness now exists or shall hereafter be created,
shall happen and shall result in an aggregate principal amount exceeding
$20,000,000 becoming or being declared due and payable prior to the date on
which it would otherwise have become due and payable, without such indebtedness
having been discharged, or such acceleration having been rescinded or annulled,
within a period of ten days after there shall have been given, by registered or
certified mail, to the Company by the Trustee or to the Company and the Trustee
by the Holders of at least 25% in principal amount of the outstanding Notes, a
written notice specifying such default and requiring the Company to cause such
indebtedness to be discharged or cause such acceleration to be rescinded or
annulled and stating that such notice is a "Notice of Default" hereunder.



                                      -6-
<PAGE>


                                    ARTICLE 5

                                  EFFECTIVENESS

         This Supplemental Indenture shall be effective for all purposes as of
the date and time this Supplemental Indenture has been executed and delivered by
the Company and the Trustee in accordance with Article Nine of the Indenture. As
supplemented hereby, the Indenture is hereby confirmed as being in full force
and effect.

                                    ARTICLE 6

                                  MISCELLANEOUS

         Section 6.1 In the event any provision of this Supplemental Indenture
shall be held invalid or unenforceable by any court of competent jurisdiction,
such holding shall not invalidate or render unenforceable any other provision
hereof or any provision of the Indenture.

         Section 6.2 To the extent that any terms of the Notes are inconsistent
with the terms of the Indenture, the terms of the Notes shall govern and
supersede such inconsistent terms.

         Section 6.3 This Supplemental Indenture shall be governed by and
construed in accordance with the laws of The Commonwealth of Massachusetts.

         Section 6.4 This Supplemental Indenture may be executed in several
counterparts, each of which shall be an original and all of which shall
constitute but one and the same instrument.



                  [Remainder of page intentionally left blank.]



                                      -7-
<PAGE>


         IN WITNESS WHEREOF, the Company and the Trustee have caused this
Supplemental Indenture to be executed as an instrument under seal in their
respective corporate names as of the date first above written.

                                 HRPT PROPERTIES TRUST



                                  By:
                                       ------------------------------
                                       David J. Hegarty
                                       President


                                  STATE STREET BANK AND TRUST COMPANY,
                                    as Trustee


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






                                      -8-
<PAGE>



                                    EXHIBIT A
                                 (Face of Note)

                   8 1/2% Monthly Income Senior Notes due 2013
No.                                                                 $__________

                              HRPT PROPERTIES TRUST

promises to pay to _______________________________________ or registered
assigns, the principal sum of _____________________________________ Dollars on
November, __ 2013.

                  Interest Payment Dates: the 15th of each month.
                  Record Dates: the first day of each month.

CUSIP No.:        _________

                                     HRPT PROPERTIES TRUST



                                     By:____________________________________
                                          David J. Hegarty
                                          President
[SEAL]


                                     Attest:__________________________________
                                                Alexander A. Notopoulos, Jr.
                                                Assistant Secretary


Dated: November ___, 1998

This is one of the Notes referred to in the within-mentioned Indenture:

STATE STREET BANK AND TRUST COMPANY, as Trustee


By:
     ------------------------
       Authorized Signatory

                                      A - 1

<PAGE>



                                 (Back of Note)

                              HRPT PROPERTIES TRUST

                    __% Monthly Income Senior Notes due 2013

         Capitalized terms used herein have the meanings assigned to them in the
Indenture (as defined below) unless otherwise indicated.

         1. Interest. HRPT Properties Trust, a Maryland real estate investment
trust (the "Company"), promises to pay interest on the principal amount of this
Note at the rate and in the manner specified below.

         The Company shall pay in cash interest on the principal amount of this
Note at the rate per annum of 8 1/2%. The Company will pay interest monthly in
arrears on the 15th of each month, commencing on January 15, 1998 or if any such
day is not a Business Day (as defined in the Indenture), on the next succeeding
Business Day (each an "Interest Payment Date"), to Holders of record on the
immediately preceding first day of each month (whether or not a Business Day).

         Interest will be computed on the basis of a 360-day year consisting of
twelve 30-day months. Interest shall accrue from the most recent date to which
interest has been paid or, if no interest has been paid, from November 30, 1998.

         2. Method of Payment. The Company will pay interest on the Notes
(except defaulted interest) to the Persons who are registered Holders of Notes
at the close of business on the record date next preceding the Interest Payment
Date, even if such Notes are canceled after such record date and on or before
such Interest Payment Date. The Company will pay principal and interest in money
of the United States that at the time of payment is legal tender for payment of
public and private debts. The Company, however, may pay principal, premium, if
any, and interest by check payable in such money. It may mail an interest check
to a Holder's registered address.

         3. Indenture. The Company issued the Notes under an Indenture, dated as
of July 9, 1997, as supplemented by Supplemental Indenture No. 5, dated as of
November 30, 1998 (the "Indenture") between the Company and the Trustee. The
terms of the Notes include those stated in the Indenture and those made part of
the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S. Code
ss.ss. 77aaa-77bbbb) as in effect on the date of the Indenture. The Notes are
subject to all such terms, and Holders of the Notes are referred to the
Indenture and such Act for a statement of such terms. The terms of the Indenture
shall govern any inconsistencies between the Indenture and the Notes. The Notes
are unsecured general obligations of the Company limited to $149,500,000 in
aggregate principal amount, except as otherwise provided in the Indenture.

         4. Optional Redemption. The Notes may not be redeemed prior to November
15, 2003. From and after November 15, 2003, the Notes will be subject to
redemption at any time at the option of the Company, in whole or in part, upon
not less than 30 nor more than 60 days' notice, at a redemption price equal to
the principal amount of the Notes being redeemed, plus accrued and unpaid
interest to but excluding the applicable redemption date.

         5. Mandatory Redemption. The Company shall not be required to make
sinking fund or redemption payments with respect to the Notes.



                                      A-2
<PAGE>


         6. Notice of Redemption. Notice of redemption shall be mailed at least
30 days but not more than 60 days before the redemption date to each Holder of
Notes to be redeemed at its registered address. Notes may be redeemed in part
but only in whole multiples of $1,000, unless all of the Notes held by a Holder
are to be redeemed. On and after the redemption date, interest ceases to accrue
on Notes or portions of them called for redemption.

         7. Denominations, Transfer, Exchange. The Notes are in registered form
without coupons in denominations of $1,000 and integral multiples thereof. The
transfer of Notes may be registered and Notes may be exchanged as provided in
the Indenture. The Registrar and the Trustee may require a Holder, among other
things, to furnish appropriate endorsements and transfer documents and to pay
any taxes and fees required by law or permitted by the Indenture. The Registrar
need not exchange or register the transfer of any Note or portion of a Note
selected for redemption. Also, it need not exchange or register the transfer of
any Notes for a period of 15 days before the mailing of a notice of redemption
of Notes, or during the period between a record date and the corresponding
Interest Payment Date.

         8. Defaults and Remedies. In case an Event of Default (as defined in
the Indenture) with respect to the Notes shall have occurred and be continuing,
the principal hereof may be declared, and upon such declaration shall become,
due and payable, in the manner, with the effect and subject to the provisions
provided in the Indenture.

         9. Actions of Holders. The Indenture contains provisions permitting the
holders of not less than a majority of the aggregate principal amount of the
outstanding Notes, on behalf of the holders of all such Notes at a meeting duly
called and held as provided in the Indenture, to make, give or take any request,
demand, authorization, direction, notice, consent, waiver or other action
provided in the Indenture to be made, given or taken by the holders of the
Notes, including without limitation, waiving (a) compliance by the Company with
certain provisions of the Indenture, and (b) certain past defaults under the
Indenture and their consequences. Any resolution passed or decision taken at any
meeting of the holders of the Notes in accordance with the provisions of the
Indenture shall be conclusive and binding upon such holders and upon all future
holders of this Note and other Notes issued upon the registration of transfer
hereof or in exchange heretofore or in lieu hereof

         10. Persons Deemed Owners. The Company, the Trustee, and any agent of
the Company or the Trustee may deem and treat the Person in whose name this Note
is registered on the Security Register as its absolute owner for all purposes.

         11. Authentication. This Note shall not be valid until authenticated by
the manual signature of the Trustee or an authenticating agent.

         12.      Governing Law.  THE INTERNAL LAW OF THE COMMONWEALTH OF
MASSACHUSETTS SHALL GOVERN AND BE USED TO CONSTRUE THE INDENTURE AND THE
NOTES.

         13. No Personal Liability. THE AMENDED AND RESTATED DECLARATION OF
TRUST OF THE COMPANY, DATED JULY 1, 1994, A COPY OF WHICH, TOGETHER WITH ALL
AMENDMENTS THERETO (THE "DECLARATION"), IS DULY FILED IN THE OFFICE OF THE
DEPARTMENT OF ASSESSMENTS AND TAXATION OF THE STATE OF MARYLAND, PROVIDES THAT
THE NAME "HRPT PROPERTIES TRUST" REFERS TO THE TRUSTEES UNDER THE DECLARATION
COLLECTIVELY AS TRUSTEES, BUT NOT INDIVIDUALLY OR PERSONALLY, AND THAT NO
TRUSTEE, OFFICER, SHAREHOLDER, EMPLOYEE OR 




                                      A-3
<PAGE>

AGENT OF THE COMPANY SHALL BE HELD TO ANY PERSONAL LIABILITY, JOINTLY OR
SEVERALLY, FOR ANY OBLIGATION OF, OR CLAIM AGAINST, THE COMPANY. ALL PERSONS
DEALING WITH THE COMPANY, IN ANY WAY, SHALL LOOK ONLY TO THE ASSETS OF THE
COMPANY FOR THE PAYMENT OF ANY SUM OR THE PERFORMANCE OF ANY OBLIGATION.

         The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture. Request may be made to:

                           HRPT Properties Trust
                           400 Centre Street
                           Newton, MA 02458
                           Telecopier No.:  (617) 332-2261
                           Attention: President









                                      A-4
<PAGE>

                                 ASSIGNMENT FORM


         To assign this Note, fill in the form below: (I) or (we) assign and
transfer this Note to


                  (Insert assignee's soc. sec. or tax I.D. no.)




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

and irrevocably appoint
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.



Date:

                                         Your Signature:
                                         (Sign exactly as your name appears on
                                         the face of this Note)

Signature Guarantee:




                                      A-5





                                                                     Exhibit 8.1

                            SULLIVAN & WORCESTER LLP
                             One Post Office Square
                           Boston, Massachusetts 02109




                                               November 24, 1998





HRPT Properties Trust
400 Centre Street
Newton, Massachusetts  02158

Ladies and Gentlemen:

         In connection with the registration by HRPT Properties Trust, a
Maryland real estate investment trust (the "Company"), of $130,000,000 of 8 1/2%
Monthly Income Senior Notes due 2013, the following opinion is furnished to you
to be filed with the Securities and Exchange Commission (the "SEC") as Exhibit
8.1 to the Company's Current Report on Form 8-K, to be filed within one week of
the date hereof, under the Securities Exchange Act of 1934, as amended (the
"Exchange Act").

         We have acted as counsel for the Company in connection with its
Registration Statement on Form S-3, File No. 333-56051 (the "Registration
Statement"), under the Securities Act of 1933, as amended (the "Act"), and we
have examined originals or copies, certified or otherwise identified to our
satisfaction, of the Registration Statement, corporate records, certificates and
statements of officers and accountants of the Company and of public officials,
and such other documents as we have considered relevant and necessary in order
to furnish the opinion hereinafter set forth. Specifically, and without limiting
the generality of the foregoing, we have reviewed the Company's declaration of
trust, as amended and restated, the by-laws of the Company, the prospectus
supplement dated November 24, 1998 (the "Prospectus Supplement") to the final
prospectus dated June 15, 1998 (as supplemented by the Prospectus Supplement,
the "Prospectus") which forms a part of the Registration Statement, and the
Company's Annual Report on Form 10-K for the year ended December 31, 1997, filed
under the Exchange Act (the "Annual Report"). We have reviewed the sections of
the Annual Report captioned "Federal Income Tax Considerations" and "ERISA
Plans, Keogh Plans and Individual Retirement Accounts," as supplemented by the
section in the Prospectus Supplement captioned "Certain Federal Income Tax
Considerations." With respect to all questions of fact on which the opinion set
forth below is based, we have assumed the accuracy and completeness of and have
relied on the information set forth in the Prospectus and the Annual Report, and
in the documents 


<PAGE>


HRPT Properties Trust
November 24, 1998
Page 2

incorporated therein by reference, and on representations made to
us by the officers of the Company. We have not independently verified such
information.

         The opinion set forth below is based upon the Internal Revenue Code of
1986, as amended, the Treasury Regulations issued thereunder, published
administrative interpretations thereof, and judicial decisions with respect
thereto, all as of the date hereof (collectively, the "Tax Laws"), and upon the
Employee Retirement Income Security Act of 1974, as amended, the Department of
Labor regulations issued thereunder, published administrative interpretations
thereof, and judicial decisions with respect thereto, all as of the date hereof
(collectively, the "ERISA Laws"). No assurance can be given that the Tax Laws or
the ERISA Laws will not change. In preparing the discussions with respect to Tax
Laws and ERISA Laws matters in the sections of the Annual Report captioned
"Federal Income Tax Considerations" and "ERISA Plans, Keogh Plans and Individual
Retirement Accounts," and in the section of the Prospectus Supplement captioned
"Certain Federal Income Tax Considerations," we have made certain assumptions
and expressed certain conditions and qualifications therein, all of which
assumptions, conditions and qualifications are incorporated herein by reference.

         Based upon and subject to the foregoing, we are of the opinion that the
discussions with respect to Tax Laws and ERISA Laws matters in the sections of
the Annual Report captioned "Federal Income Tax Considerations" and "ERISA
Plans, Keogh Plans and Individual Retirement Accounts," as supplemented by the
discussion in the Prospectus Supplement captioned "Certain Federal Income Tax
Considerations," in all material respects are accurate and fairly summarize the
Tax Laws issues and ERISA Laws issues addressed therein, and hereby confirm that
the opinions of counsel referred to in said sections represent our opinions on
the subject matter thereof.

         We hereby consent to the incorporation of this opinion by reference as
an exhibit to the Registration Statement and to the reference to our firm in the
Prospectus. In giving such consent, we do not thereby admit that we come within
the category of persons whose consent is required under Section 7 of the Act or
under the rules and regulations of the SEC promulgated thereunder.

                                              Very truly yours,

                                              /s/ Sullivan & Worcester LLP

                                              SULLIVAN & WORCESTER LLP






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