HRPT PROPERTIES TRUST
8-K, 1998-08-24
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): August 21, 1998





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




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


400 Centre Street, Newton, Massachusetts                              02158
(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 August 21,  1998 by and among
                  HRPT  Properties  Trust  and the  several  Underwriters  named
                  therein  pertaining  to  $160,000,000  in aggregate  principal
                  amount of 6 7/8 %Senior Notes due 2003.

         4.1      Form of Supplemental  Indenture dated as of August 26, 1998 by
                  and between  HRPT  Properties  Trust and State Street Bank and
                  Trust  Company   pertaining  to   $160,000,000   in  aggregate
                  principal amount of 6 7/8% Senior Notes due 2003.






<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: August 21, 1998


                                                                     EXHIBIT 1.1

                              HRPT PROPERTIES TRUST
                    (a Maryland real estate investment trust)

                $160,000,000 6 7/8% Senior Notes due August 26, 2002

                               PURCHASE AGREEMENT




                                                               August 21, 1998




MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
                Incorporated
DONALDSON, LUFKIN & JENRETTE
       SECURITIES CORPORATION
MORGAN STANLEY & CO. INCORPORATED
SALOMON BROTHERS 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  ("Donaldson  Lufkin"),  Morgan  Stanley & Co.
Incorporated   ("Morgan   Stanley")   and  Salomon   Brothers  Inc   ("Salomon")
(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 principal amount of 6(% Senior Notes due August 26, 2002 (the "Notes")
set forth opposite the name of each such Underwriter listed in Schedule A hereto
at a purchase price of 99.151% of the principal  amount of 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 August 26, 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-S3 (No.  33356051) 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  


<PAGE>
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 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.

                  (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.

                                        2

<PAGE>

                  (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 notes thereto) are
         reasonable  and the  adjustments  used therein are  appropriate to give
         effect to the  transactions or circumstances  referred to therein.  The
         adjusted pro forma  financial  statements  and other adjusted 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 and (ii)
         have been  properly  compiled  on the basis  described  therein and the
         assumptions  used  in  the  preparation  of  such  adjusted  pro  forma
         financial statements and other adjusted pro forma financial information
         (including the 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

                                        3
<PAGE>

         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), (B) issued any shares of beneficial
         interest  of the  Company or any of its  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  and  grants  to  employees  pursuant  to the  Company's  Stock
         Incentive Plan in July 1998) 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
         shortterm or longterm 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 

                                        4
<PAGE>

         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 bylaws 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 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.

                                        5
<PAGE>         

                  (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 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.

                                        6
<PAGE>
                  (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 similar
         terms  in any  Environmental  Law or by any  federal,  state  or  local
         government or  quasigovernment  authority,  or any petroleum  products,
         asbestos,   leadbased  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,  

                                        7
<PAGE>
         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
         quasipublic  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,
         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 noncontrolling  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 

                                        8

<PAGE>
         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.

                  (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.

                                        9
<PAGE>

                  (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) Payment of the  purchase  price for and delivery of the 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"). 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.  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.

         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

                                       10
<PAGE>

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 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 posteffective 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 S3).

         (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 

                                       11
<PAGE>

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 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 

                                       12
<PAGE>

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 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  outofpocket  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 posteffective  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 102 of  Regulation  SX  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.

                                       13

<PAGE>

                  (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,
         nonassessable,  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).

                  (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.

                                       14

<PAGE>

                  (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.

                  (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 and the Excluded  Proceedings  (as
         defined in  paragraph  (xx)  below),  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.

                                       15
<PAGE>
                  (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
         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  856860 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


                                       16
<PAGE>
         contribution  provisions  contained in such agreement may be limited by
         federal or state securities laws and the public policy  underlying such
         laws.

                  (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 10K for the fiscal year ended  December 31, 1997 under the caption
         "Legal Proceedings" and any claims related thereto  (collectively,  the
         "Excluded Proceedings").

         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 10K 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.

                                       17
<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 

                                       18
<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.

         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.

         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 

                                       19
<PAGE>

                  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.

         (a) 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).

         (b) 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  

                                       20
<PAGE>

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 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.

                                       21
<PAGE>
         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 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 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  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.

                                       22
<PAGE>
       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  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.



                                       23

<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
MORGAN STANLEY & CO. INCORPORATED
SALOMON BROTHERS INC


         By:  MERRILL LYNCH & CO.

         Merrill Lynch, Pierce, Fenner & Smith
              Incorporated

By /s/ Tjarda Claget
   Name:  Tjarda Claget
   Title:
   Acting on behalf of themselves and
   the other named Underwriters in Schedule A

                                       24

<PAGE>





                                   SCHEDULE A






                Underwriter                                 Aggregate Principal
                                                              Amount of Notes

Merrill Lynch, Pierce, Fenner & Smith
                Incorporated...................................   $112,000,000

Donaldson, Lufkin & Jenrette
     Securities Corporation....................................     16,000,000

Morgan Stanley & Co. Incorporated..............................     16,000,000

Salomon Brothers Inc...........................................     16,000,000
                                                                  ------------
                Total..........................................   $160,000,000
                                                                  ============


                                                                     EXHIBIT 4.1
                          SUPPLEMENTAL INDENTURE NO. 4

                                 by and between

                              HRPT PROPERTIES TRUST

                                       and

                       STATE STREET BANK AND TRUST COMPANY

                              as of August 26, 1998




             SUPPLEMENTAL TO THE INDENTURE DATED AS OF JULY 9, 1997




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





                              HRPT PROPERTIES TRUST
                    $160,000,000 6 7/8% Senior Notes due 2002

                                                        

<PAGE>



         This SUPPLEMENTAL INDENTURE NO. 4 (this "Supplemental  Indenture") made
and entered into as of August 26, 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 $160,000,000 6 7/8% Senior Notes due 2002; 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  principles in determining  Earnings from  Operations for such period
and (vi) amortization of deferred charges.


<PAGE>


         "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,  (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.

         "Interest  Payment  Date"  means any date on which  interest is due and
payable on the Notes in accordance with the terms thereof.

         "Issuance  Date"  means  the  closing  date for the  sale and  original
issuance of the Notes.

         "Make-Whole  Amount" means, in connection with any optional  redemption
or  accelerated  payment of any Note,  the excess,  if any, of (i) the aggregate
present value as of the date of such  redemption or accelerated  payment of each
dollar of principal being redeemed or paid and the amount of interest (exclusive
of interest accrued to the date of redemption or accelerated payment) that would
have been payable in respect of such dollar if such  redemption  or  accelerated
payment had not been made,  determined by  discounting,  on a semiannual  basis,
such principal and interest at the  Reinvestment  Rate  (determined on the third
Business  Day  preceding  the  date  such  notice  of  redemption  is  given  or
declaration of  acceleration  is made) from the  respective  dates on which such
principal and interest would have been payable if such redemption or accelerated
payment had not been made, over (ii) the aggregate principal amount of the Notes
being redeemed

                                       -2-

<PAGE>



or paid. For purposes of this Supplemental  Indenture and the Notes,  references
in the  Indenture  to the payment of the  principal  (and  premium,  if any) and
interest on the Notes  shall be deemed to include the payment of the  Make-Whole
Amount, if any, due upon redemption with respect to the Notes.

         "Notes" means the Company's  $160,000,000 aggregate principal amount of
6 7/8%  Senior  Notes,  due 2002,  issued  under this  Indenture,  as amended or
supplemented from time to time.

         "Record  Date"  means the  fifteenth  calendar  day,  whether  or not a
Business Day, next preceding the applicable Interest Payment Date.

         "Reinvestment  Rate"  means a rate per annum  equal to the sum of 0.25%
(twenty-five  one  hundredths  of  one  percent)  plus  the  yield  on  treasury
securities at constant maturity under the heading "Week Ending" published in the
Statistical  Release under the caption  "Treasury  Constant  Maturities" for the
maturity  (rounded to the nearest month)  corresponding to the remaining life to
maturity,  as of the payment date of the principal being redeemed or paid. If no
maturity  exactly  corresponds  to such  maturity,  yields for the two published
maturities  most closely  corresponding  to such  maturity  shall be  calculated
pursuant to the immediately  preceding  sentence and the Reinvestment Rate shall
be  interpolated  or  extrapolated  from such yields on a  straight-line  basis,
rounding in each of such relevant  periods to the nearest month. For purposes of
calculating the Reinvestment Rate, the most recent Statistical Release published
prior to the date of determination of the Make-Whole Amount shall be used.

         "SEC" means the Securities and Exchange Commission.

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

         "Securities Act" means the Securities Act of 1933, as amended.

         "Statistical  Release"  means the  statistical  release  designated "H.
15(519)" or any successor  publication  which is published weekly by the Federal
Reserve  System and which  establishes  yields on actively  traded United States
government  securities  adjusted to constant  maturities or, if such statistical
release  is  not  published  at  the  time  of  any  determination   under  this
Supplemental  Indenture,  then any publicly  available  source of similar market
data which shall be designated by the Company.

         "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 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).


                                       -3-
<PAGE>
         "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; Limitation on Aggregate Principal Amount; Form of Notes. The
Notes shall be known as the Company's $160,000,000 6 7/8% Senior Notes due 2002.
The Notes will be limited to an aggregate principal amount of $160,000,000.  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 single fully registered  global
security without coupons (the "Global Note") which 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 a  definitive  form.  Unless  and  until it is
exchanged in whole or in part for the individual notes represented  thereby, the
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 depository or any nominee of such successor.

         So long as DTC or its  nominee is the  registered  owner of such 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 the 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 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
depository and a successor  depository is not appointed by the Company within 90
days,  the Company will issue  individual  Notes in exchange for the Global Note
representing such Notes and the Trustee, upon receipt of an authentication order
pursuant to ss. 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 such debt
Securities.  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) Principal Repayment;  Currency. The Stated Maturity of the Notes is
August 26, 2002,  provided,  however,  the Notes may be earlier  redeemed at the
option of the Company as provided in paragraph (c) 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,

                                       -4-

<PAGE>



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.

         (c)  Redemption at the Option of the Company;  Acceleration.  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 sum of (i) the principal  amount of the Notes being redeemed,
plus accrued and unpaid interest to but excluding the applicable redemption date
and (ii) the Make-Whole Amount. 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 and the Make-Whole  Amount shall become due
and payable immediately.

         (d) 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 6 7/8% Senior Notes due 2002.

         (e) Global Note Legend. The Global Note shall bear the following legend
on the face thereof:

         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 (the "Exchange Act"), with
         the Trustee) prior to the incurrence of such

                                       -5-

<PAGE>



         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 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.

         (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

                                       -6-

<PAGE>


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.

                                    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.

                                       -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)

                           6 7/8% Senior Notes due 2002
No.                                                              $__________

                              HRPT PROPERTIES TRUST

promises  to  pay  to   _______________________________________   or  registered
assigns, the principal sum of  _____________________________________  Dollars on
August 26, 2002.

                  Interest Payment Dates: February 26 and August 26.
                  Record Dates:  February 11 and August 11.

CUSIP No.:        40426WAF8

                                            HRPT PROPERTIES TRUST



                                            By:______________________________
                                                 Name:
                                                 Title:
[SEAL]

Dated:

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

                           6 7/8% Senior Notes due 2002

         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  6  7/8%.  The  Company  will  pay  interest
semi-annually  in arrears on February 26 and August 26 of each year,  commencing
on February 26, 1999 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 February 11 and August
11.

         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 the date of the
original issuance of the Notes.

         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 a Supplemental  Indenture dated as of August
26, 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  $160,000,000  in  aggregate
principal amount.

         4. Optional Redemption.  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 sum of (i) the
principal  amount of the Notes being redeemed,  plus accrued and unpaid interest
to but excluding the applicable redemption date and (ii) the Make-Whole Amount.

         As used herein the term  "Make-Whole  Amount" means, in connection with
any optional  redemption or accelerated payment of any Note, the excess, if any,
of (i)  the  aggregate  present  value  as of the  date of  such  redemption  or
accelerated  payment of each dollar of principal  being redeemed or paid and the
amount of interest  (exclusive of interest  accrued to the date of redemption or
accelerated  payment)  that would have been payable in respect of such dollar if
such  redemption  or  accelerated  payment  had not  been  made,  determined  by
discounting,  on  a  semiannual  basis,  such  principal  and  interest  at  the
Reinvestment  Rate (as defined  herein)  (determined  on the third  Business Day
preceding the date such notice of redemption is given or declaration

                                      A - 2

<PAGE>

of acceleration  is made) from the respective  dates on which such principal and
interest would have been payable if such  redemption or accelerated  payment had
not been  made,  over (ii) the  aggregate  principal  amount of the Notes  being
redeemed or paid.

         As used  herein  the term  "Reinvestment  Rate"  means a rate per annum
equal to the sum of 0.25%  (twenty-five  one hundredths of one percent) plus the
yield on treasury  securities  at  constant  maturity  under the  heading  "Week
Ending"  published  in the  Statistical  Release (as defined  herein)  under the
caption "Treasury Constant  Maturities" for the maturity (rounded to the nearest
month)  corresponding to the remaining life to maturity,  as of the payment date
of the principal being redeemed or paid. If no maturity  exactly  corresponds to
such   maturity,   yields  for  the  two  published   maturities   most  closely
corresponding  to such maturity shall be calculated  pursuant to the immediately
preceding   sentence  and  the  Reinvestment   Rate  shall  be  interpolated  or
extrapolated from such yields on a straight-line basis, rounding in each of such
relevant  periods  to  the  nearest  month.  For  purposes  of  calculating  the
Reinvestment  Rate, the most recent  Statistical  Release published prior to the
date of determination of the Make-Whole Amount shall be used.

         As used herein the term  "Statistical  Release"  means the  statistical
release designated "H. 15(519)" or any successor  publication which is published
weekly by the Federal  Reserve System and which  establishes  yields on actively
traded United States government  securities  adjusted to constant maturities or,
if such  statistical  release is not published at the time of any  determination
under the Supplemental  Indenture,  then such other reasonably  comparable index
which shall be designated by the Company.

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

         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

                                      A - 3

<PAGE>



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 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:




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