HRPT PROPERTIES TRUST
8-K, 1999-10-26
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): October 12, 1999




                              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                      02458
    (Address of principal executive offices)                    (Zip code)


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



          (Former name or former address, if changed since last report)


<PAGE>



Item 2.       Acquisition or Disposition of Assets

         In its  Current  Report  on Form 8-K dated  September  21,  1999,  HRPT
Properties  Trust ("HRP")  announced that it would  distribute the shares of its
subsidiary,  Senior Housing Properties Trust ("Senior  Housing"),  in a spin-off
(the "Spin-Off")  pursuant to the Registration  Statement on Form S-11 (File No.
333-69703) filed by Senior Housing with the Securities and Exchange  Commission,
which became  effective on September  21, 1999.  Prior to the  Spin-Off,  Senior
Housing had 26 million  common shares of beneficial  interest  ("Senior  Housing
Common Shares") outstanding, all of which were held by HRP. On October 12, 1999,
HRP  distributed  13,190,763  million  Senior  Housing  Common  Shares  to HRP's
shareholders  of record on October 8, 1999. The Senior Housing Common Shares now
trade on the New York Stock Exchange under the symbol "SNH."

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

(b)      Unaudited  Pro  Forma   Consolidated   Financial   Statements  of  HRPT
         Properties Trust

         Incorporated  by  reference  from  Item 7 of the  Registrant's  Current
Report on Form 8-K dated September 21, 1999.

(c)      Exhibits

         2.1      Transaction Agreement, dated as of September 21, 1999, between
                  Senior Housing Properties Trust and HRPT Properties Trust.

         10.1     Promissory   Note,   dated  September  1,  1999,  from  SPTMRT
                  Properties  Trust and  Senior  Housing  Properties  Trust,  as
                  makers, to HRPT Properties Trust, as holder.


                           FORWARD LOOKING STATEMENTS

         This Current  Report on Form 8-K contains  statements  and  information
that constitute  forward looking statements within the meaning of the Securities
Exchange Act of 1934, as amended.  These statements appear in a number of places
in this Form 8-K and include statements regarding strategies, plans, beliefs and
current  expectations of HRP's  management.  Readers are cautioned that any such
forward looking statements are not guarantees of future events and involve risks
and  uncertainties  that could cause actual  results to differ  materially  from
those in the forward looking statements.  Such risks and uncertainties  include,
but are not limited to, the factors discussed in this Form 8-K.

                                       -2-

<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/ John Popeo
                               John Popeo, Treasurer and Chief Financial Officer

Date: October 26, 1999



                              TRANSACTION AGREEMENT


                                 by and between


                              HRPT PROPERTIES TRUST


                                       and


                         SENIOR HOUSING PROPERTIES TRUST





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

                               September 21, 1999

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






<PAGE>



<TABLE>
<CAPTION>
                                TABLE OF CONTENTS

                                                                                                               Page

<S>                                                                                                              <C>
SECTION 1         DEFINITIONS.....................................................................................1

SECTION 2         TRANSFERS; DISTRIBUTION.........................................................................6
                  2.1      Transfer of Senior Properties..........................................................6
                  2.2      Transfer of Capital Stock; Promissory Notes............................................6
                  2.3      The Distribution.......................................................................7
                  2.4      Representations; No Implied Representations, etc.......................................8

SECTION 3         POST-DISTRIBUTION COVENANTS....................................................................10
                  3.1      Operations and Investments of HRPT and Senior Housing.................................10
                  3.2      Cooperation, Exchange of Information, and Retention of Records........................10
                  3.3      Repayment of Senior Housing Formation Debt............................................11
                  3.4      Covenants to Maintain REIT Qualification..............................................12
                  3.5      Transfer of Senior Housing Shares.....................................................12

SECTION 4         DISTRIBUTION DATE ALLOCATIONS..................................................................12
                  4.1      GAAP Allocations......................................................................12
                  4.2      Cash Allocations......................................................................12
                  4.3      No Other Prorations...................................................................13

SECTION 5         SURVIVAL; INDEMNIFICATION......................................................................13
                  5.1      Indemnification by HRPT...............................................................13
                  5.2      Indemnification by Senior Housing.....................................................14
                  5.3      Indemnification Procedures............................................................14
                  5.4      Certain Limitations, Etc..............................................................15
                  5.5      Priority of Section 6.................................................................16

SECTION 6         TAX MATTERS....................................................................................16
                  6.1      General Responsibility for Taxes......................................................16
                  6.2      Allocation of Certain Taxes Among Taxable Periods.....................................16
                  6.3      Filing and Payment Responsibility.....................................................17
                  6.4      Refunds and Credits...................................................................17
                  6.5      Tax Contests..........................................................................17
                  6.6      Resolution of Disputes................................................................18

SECTION 7         MISCELLANEOUS..................................................................................18
                  7.1      Arbitration...........................................................................18
                  7.2      Confidentiality.......................................................................18
                  7.3      Notices...............................................................................19
                  7.4      Waivers, Etc..........................................................................20




<PAGE>



                  7.5      Assignment; Successors and Assigns....................................................20
                  7.6      Severability..........................................................................20
                  7.7      Counterparts, Etc.....................................................................20
                  7.8      Governing Law.........................................................................20
                  7.9      Expenses..............................................................................21
                  7.10     Section and Other Headings; Interpretation............................................21
                  7.11     Exculpation...........................................................................21


EXHIBIT A         Form of SPTMRT Properties Trust and Senior Housing Properties Trust
                  Promissory Note
SCHEDULE I        Description of Premises
SCHEDULE II       Description of Tenant Leases
SCHEDULE III      Description of Transferred Subsidiaries

</TABLE>




                                      -ii-

<PAGE>






                              TRANSACTION AGREEMENT


         TRANSACTION  AGREEMENT  made  September  21, 1999,  by and between HRPT
PROPERTIES  TRUST,  a Maryland  real  estate  investment  trust  (including  its
successors and permitted assigns,  "HRPT"), and SENIOR HOUSING PROPERTIES TRUST,
a Maryland real estate  investment trust (including its successors and permitted
assigns,"Senior Housing") and currently a wholly-owned subsidiary of HRPT.

                                     RECITAL

         HRPT  is a real  estate  investment  trust  which,  indirectly  through
subsidiaries,  owns a  diversified  portfolio  of office  buildings  and  senior
housing  properties.  The board of trustees of HRPT has determined that it is in
the best interests of HRPT and its shareholders to separate the ownership of the
office  building and the senior  housing  properties and in order to effect such
separation,  to transfer all of the stock of HRPT  subsidiaries  holding  senior
housing properties to Senior Housing,  to accept $200,000,000 of indebtedness of
Senior Housing and certain of its subsidiaries as partial consideration for such
transfers,  and to  distribute a majority of the  outstanding  common  shares of
beneficial  interest  of Senior  Housing  held by HRPT to the  holders of common
shares of beneficial interest of HRPT as a special distribution. As part of this
separation  transaction  and  distribution,  HRPT and Senior Housing will assume
certain obligations under this Agreement.

         NOW, THEREFORE, it is agreed:

SECTION 1         DEFINITIONS.

         Capitalized  terms used in this  Agreement  shall have the meanings set
forth below:

         1.1 "Action":  any litigation or legal or other actions,  arbitrations,
counterclaims, investigations, proceedings, requests for material information by
or pursuant to the order of any Governmental  Authority,  or suits, at law or in
arbitration or equity commenced by any Person.

         1.2 "Advisor":  with respect to HRPT or Senior Housing at any time, the
Entity at that time serving as advisor to such party,  which for both parties is
initially Reit Management & Research, Inc., a Delaware corporation.

         1.3  "Affiliate":   with  respect  to  any  Person,  any  other  Person
controlling,  controlled  by or under common  control  with,  such Person,  with
"control" for such purpose with respect to a corporation, real estate investment
or business trust or similar entity, meaning the possession of the power to vote
or direct the voting of a majority of the voting  securities of, or other voting
interests  in, such Person  which are entitled to elect  directors,  trustees or
similar officials of such Person.




<PAGE>



         1.4 "Agent":  State Street Bank & Trust Company, the distribution agent
appointed by HRPT to distribute  the Senior  Housing Common Shares to holders of
HRPT Common Shares pursuant to the Distribution.

         1.5  "Agreement":   this  Transaction  Agreement,   together  with  the
Schedules and Exhibit hereto.

         1.6 "Code":  the United States  Internal  Revenue Code of 1986, as from
time  to  time in  effect,  and any  successor  law,  and any  reference  to any
statutory provision shall be deemed to be a reference to any successor statutory
provision.

         1.7 "Commission": the United States Securities and Exchange Commission.

         1.8 "Contract": any lease, contract,  instrument,  license,  agreement,
sales order, purchase order, open bid or other obligation or commitment (whether
or not written) and all rights therein.

         1.9 "Covered Liabilities": the meaning given in Section 5.1.

         1.10 "Deferred Payment": the meaning given in subsection 2.2(b).

         1.11  "Deferred  Payment  Due Date":  the meaning  given in  subsection
2.2(b).

         1.12  "Distribution":  the  distribution  of a number of Senior Housing
Common  Shares  by HRPT to  holders  of HRPT  Common  Shares  equal to one tenth
(1/10th) of the number of HRPT Common Shares which are issued and outstanding on
the Record Date.

         1.13  "Distribution  Date": the date determined by the HRPT Board or an
authorized  committee  thereof  as the date on which the  Distribution  shall be
effected,  which  Distribution Date is contemplated to occur on or about October
12, 1999.

         1.14   "Effective   Date":   the  date  on  which  the  Senior  Housing
Registration Statement is declared effective by the Commission.

         1.15 "Entity": a real estate investment trust, a corporation, a limited
liability company, a partnership, an association, a trust or any other entity or
organization,  including a government or political  subdivision or any agency or
instrumentality thereof.

         1.16 "GAAP": generally accepted accounting principles as in effect from
time to time in the United States of America.

         1.17 "Governmental Authority":  any nation or government,  any state or
other political subdivision thereof, any federal, state, local or foreign Entity
exercising  executive,  legislative,   judicial,  regulatory  or  administrative
functions of or pertaining to government,  including any  government  authority,
agency, department, board, commission, or instrumentality of the United



                                       -2-

<PAGE>



States, any State of the United States or political subdivision thereof, and any
tribunal   or   arbitral   authority   of   competent   jurisdiction,   and  any
self-regulatory organization.

         1.18 "HRPT": the meaning given in the preamble to this Agreement.

         1.19  "HRPT  Assets":  the  assets  of HRPT and its  Subsidiaries  (not
including any assets and properties  held by Senior Housing and the  Transferred
Subsidiaries  on the  Distribution  Date),  including all assets of HRPT and its
Affiliates relating to the HRPT Retained Business.

         1.20 "HRPT Board": the HRPT Board of Trustees.

         1.21 "HRPT Common  Shares":  the common shares of beneficial  interest,
$.01 par value, of HRPT.

         1.22 "HRPT Group": HRPT and each Entity whose income is included on the
federal  Income Tax Return  Form  1120-REIT  with HRPT as the  parent;  provided
Senior Housing and the Transferred  Subsidiaries  shall only be included therein
through the Distribution Date.

         1.23 "HRPT  Indemnified  Parties":  the  meaning  given to such term in
Section 5.2.

         1.24 "HRPT Retained Business": the businesses conducted by HRPT and its
Subsidiaries   pursuant  to  or  utilizing   the  HRPT  Assets,   including  the
acquisition, development, ownership and leasing of real estate assets; provided,
however,  that the HRPT  Retained  Business  shall not in any event  include the
Senior Housing Business.

         1.25  "Income  Taxes":  any and all Taxes to the  extent  based upon or
measured by net income (regardless of whether  denominated as an "income tax," a
"franchise tax" or otherwise),  imposed by any Taxing  Authority,  together with
any related interest, penalties or other additions thereto.

         1.26 "Independent Trustee":  with respect to HRPT or Senior Housing, as
applicable,  a Trustee of such party who is not an employee,  executive officer,
director (or comparable official) or Affiliate of its respective Advisor.

         1.27  "Liability":  any and all  debts,  liabilities  and  obligations,
absolute  or  contingent,  matured or  unmatured,  liquidated  or  unliquidated,
accrued or unaccrued,  known or unknown,  whenever arising,  including all costs
and expenses  relating  thereto,  and  including  those debts,  liabilities  and
obligations arising under any law, rule, regulation,  Action, threatened Action,
order or  consent  decree  of any  Governmental  Authority  or any  award of any
arbitrator of any kind,  and those  arising  under any  contract,  commitment or
undertaking.

         1.28 "Note": the meaning given in subsection 2.2(b).

         1.29 "Managing  Trustee":  with respect to HRPT or Senior  Housing,  as
applicable, a Trustee of such party who is not an Independent Trustee.



                                       -3-

<PAGE>



         1.30  "Office  Properties":  office  buildings,  warehouses  or  malls,
including medical office properties and clinical  laboratory  buildings,  and in
each case  whether  occupied  by a single  tenant or multiple  tenants,  whether
leased to private  tenants or  Governmental  Authorities,  and whether of single
purpose or mixed use.

         1.31 "Other Taxes": all Taxes other than Income Taxes.

         1.32 "Person": any natural individual or any Entity.

         1.33  "Premises":  the land,  improvements  and  fixtures  owned by the
Transferred Subsidiaries (including those described in Schedule I) together with
any  personal  property  owned  by the  Transferred  Subsidiaries  and  used  in
connection therewith.

         1.34  "Record  Date":  the  date  determined  by the  HRPT  Board or an
authorized  committee  thereof as the record  date for the  Distribution,  which
Record Date is contemplated to occur on or about October 8, 1999.

         1.35 "Retained Liability":  all of the Liabilities arising out of or in
connection  with  the HRPT  Assets  or the HRPT  Retained  Business,  all of the
Liabilities  of HRPT in  connection  with the  Actions  which are pending on the
Distribution  Date and all other  Liabilities of HRPT and its  Subsidiaries  not
constituting Senior Housing Liabilities.

         1.36  "Securities  Act":  the Securities Act of 1933, and the rules and
regulations of the Commission thereunder, all as from time to time in effect.

         1.37  "Senior  Housing":  the  meaning  given in the  preamble  to this
Agreement.

         1.38 "Senior Housing Assets": the assets held by Senior Housing and the
Transferred Subsidiaries on and after the Distribution Date.

         1.39 "Senior Housing Board": the Senior Housing Board of Trustees.

         1.40  "Senior  Housing  Business":  the  business  conducted  by Senior
Housing and its Subsidiaries after the Distribution Date,  including pursuant to
or  utilizing  the  Senior  Housing  Assets  and the  acquisition,  development,
ownership and leasing of Senior Properties.

         1.41 "Senior  Housing Common  Shares":  the common shares of beneficial
interest, $.01 par value, of Senior Housing.

         1.42 "Senior  Housing  Credit  Facility":  the meaning given in Section
2.3.

         1.43  "Senior  Housing  Group":  Senior  Housing and each Entity  whose
income is included in the federal  Income Tax Return Form  1120-REIT with Senior
Housing as the parent.




                                       -4-

<PAGE>



         1.44 "Senior Housing Indemnified Parties":  the meaning given such term
in Section 5.1.

         1.45 "Senior Housing  Liability":  all Liabilities arising out of or in
connection with any of the Senior Housing Assets or the Senior Housing Business,
excluding (i)  liabilities  arising out of or in connection with the HRPT Assets
or the HRPT  Retained  Business  and (ii) the  liabilities  in  connection  with
Actions which are pending on the Distribution Date.

         1.46  "Senior  Housing   Registration   Statement":   the  registration
statement  on Form S-11  filed by Senior  Housing  under the  Securities  Act in
connection with the Distribution.

         1.47 "Senior Properties":  senior apartments,  congregate  communities,
assisted living properties,  nursing homes or other healthcare  properties,  but
excluding  medical office  properties,  medical clinics and clinical  laboratory
buildings.

         1.48 "Separate Counsel": the meaning given in subsection 5.3(b).

         1.49  "Subsidiary":  with  respect  to any  Person,  any  Entity  (i) a
majority of the voting  securities of, or other voting interests in, such Entity
which are  entitled to elect  directors,  trustees or similar  officials of such
Entity,  or (ii) a majority of the equity interests of such Entity,  of which is
owned directly or indirectly by such Person or any Subsidiary of such Person.

         1.50 "Subsidiary Shares": the meaning given in subsection 2.2(a).

         1.51 "Tax Contests": the meaning given in Section 6.5.

         1.52 "Taxes": any net income, gross income, gross receipts, sales, use,
excise, franchise, transfer, payroll, premium, property or windfall profits tax,
alternative  or add-on  minimum tax, or other tax, fee or  assessment,  together
with any interest and any penalty,  addition to tax or other  additional  amount
imposed by any Taxing  Authority,  whether  any such tax is imposed  directly or
through withholding.

         1.53 "Taxing  Authorities":  the United States Internal Revenue Service
(or any  successor  authority)  and any other  domestic or foreign  Governmental
Authority responsible for the administration of any Tax.

         1.54  "Tax  Returns":  all  returns,  reports,  estimates,  information
statements,  declarations and other filings relating to, or required to be filed
by any taxpayer in connection with, its liability for, or its payment or receipt
of any refund of, any Tax.

         1.55  "Tenant  Leases":   the  leases  or  mortgages  of  the  Premises
identified in Schedule II.

         1.56  "Third-Party  Claim":  any Action by or before  any  Governmental
Authority  asserted by a Person other than any party hereto or their  respective
Affiliates which gives rise to a right of indemnification hereunder.



                                       -5-

<PAGE>



         1.57 "Transferred Subsidiaries":  those Subsidiaries of HRPT identified
on Schedule III.

SECTION 2         TRANSFERS; DISTRIBUTION.

         2.1  Transfer  of Senior  Properties.  Prior to the  execution  of this
Agreement and pursuant to various  assignment and assumption  agreements,  deeds
and other documents of conveyance,  HRPT transferred title to the Premises,  all
Tenant Leases and all Contracts, assets and liabilities (other than indebtedness
for  borrowed  money)  related to the  ownership,  operation  and leasing of the
Premises, to the Transferred Subsidiaries as a capital contribution.

         2.2 Transfer of Capital Stock; Promissory Notes.

                  (a) On or about September 1, 1999, HRPT  transferred to Senior
         Housing, free and clear of all liens or other encumbrances,  all of the
         issued and  outstanding  capital stock  (collectively,  the "Subsidiary
         Shares") of (i) SPTMRT Properties  Trust,  which transfer was partially
         in consideration of the deferred payments  described in clauses (b) and
         (c) below and  otherwise was a  contribution  by HRPT to the capital of
         Senior Housing,  and (ii) each of the other  Transferred  Subsidiaries,
         which  transfer  was a  contribution  by HRPT to the  capital of Senior
         Housing, in each case by delivery to Senior Housing of all certificates
         representing  the  Subsidiary  Shares,  together with stock powers duly
         executed in blank;

                  (b) In  partial  consideration  for  the  transfer  to  Senior
         Housing of the  Subsidiary  Shares issued by SPTMRT  Properties  Trust,
         Senior  Housing by delivery  of a  promissory  note (the  "Note") on or
         about  September 1, 1999 (the form of which note is attached  hereto as
         Exhibit A) agreed (i) to pay to HRPT the  aggregate  sum of two hundred
         million dollars ($200,000,000) (the "Deferred Payment"), payable on the
         10th day following the  Distribution  Date and in any event on December
         31, 1999 (the earlier of such dates,  the "Deferred  Payment Due Date")
         and  prepayable  at any time  prior to the  Deferred  Payment  Due Date
         together  with  accrued  and unpaid  interest  on the  portion  thereof
         prepaid,  and (ii) to pay interest on the unpaid Deferred  Payment from
         September  1,  1999 to (but  excluding)  the date of  payment  thereof,
         payable on the Deferred Payment Due Date and thereafter on demand, at a
         rate per annum determined for each day equal to HRPT's weighted average
         effective  interest rate on its indebtedness for money borrowed on such
         day (as  determined by HRPT in good faith),  but in no event  exceeding
         the maximum rate permitted by law;

                  (c) As a  condition  to  Senior  Housing's  acceptance  of the
         Subsidiary Shares issued by SPTMRT Properties Trust,  SPTMRT Properties
         Trust  agreed to assume and to pay,  as a primary  obligor and not as a
         guarantor, the Deferred Payment by becoming a co-maker of the Note; and

                  (d)  HRPT  and  Senior  Housing  further  agree  that  on  the
         Distribution Date immediately prior to the Distribution, HRPT will make
         a  contribution  to the  capital  of Senior  Housing  in the  amount of
         $1,000,000  plus an amount equal to (i) $169,500  times (ii) the number
         of  days  from  and  including  July  1,  1999  to  and  excluding  the
         Distribution Date.




                                       -6-

<PAGE>



         2.3  The  Distribution.  On  the  Distribution  Date,  subject  to  the
conditions set forth in this Agreement,  HRPT shall deliver to the Agent a share
certificate  representing a number of whole and fractional Senior Housing Common
Shares equal to one tenth  (1/10th) the number of HRPT Common  Shares issued and
outstanding on the Record Date,  and shall instruct the Agent to distribute,  on
or as soon as practicable on or following the  Distribution  Date, to holders of
record of HRPT Common Shares on the Record Date,  one tenth (1/10th) of a Senior
Housing  Common Share for each HRPT Common Share owned of record by such holder.
In  addition,  HRPT shall  authorize  the Agent to perform such  withholding  in
respect of the  Distribution  as may be required by Taxing  Authorities.  Senior
Housing  agrees to provide  all share  certificates  that the Agent  requires in
order to effect the Distribution and any such associated withholding.

         In  no  event  shall  the  Distribution   occur  unless  the  following
conditions shall have been satisfied:

                  (a) the  transactions  contemplated  by  Sections  2.1 and 2.2
         shall have been consummated in all material respects;

                  (b) the Senior Housing Registration  Statement shall have been
         declared  effective by the Commission and listing of the Senior Housing
         Common  Shares for  trading on the New York Stock  Exchange  shall have
         been approved by the Exchange;

                  (c) Senior Housing shall have entered into a secured revolving
         credit   facility   with  one  or  more   commercial   banks  or  other
         institutional  lenders with  availability of not less than $350,000,000
         (the "Senior Housing Credit Facility"); and

                  (d) Ernst & Young LLP shall have  delivered  to the HRPT Board
         and the Senior Housing Board a letter dated the Effective Date, in form
         and  substance  reasonably  satisfactory  to each  of  them  containing
         statements  and  information  of  the  type   ordinarily   included  in
         accountants'  "comfort letters" to underwriters in a public offering of
         securities with respect to financial  statements and certain  financial
         information  and data  contained  in the  Senior  Housing  Registration
         Statement and prospectus contained therein;

provided,  however,  that any such condition may be waived by the HRPT Board and
the Senior Housing Board in their sole discretion.




                                       -7-

<PAGE>



         2.4 Representations; No Implied Representations, etc.

                  (a) Each of HRPT and Senior Housing represents and warrants to
         the other that (i) it is duly authorized to enter into and perform this
         Agreement and has duly executed and delivered this Agreement,  and (ii)
         this   Agreement   constitutes   its  valid  and  binding   obligation,
         enforceable in accordance  with its terms,  subject to (A)  bankruptcy,
         insolvency, reorganization,  moratorium or other similar laws affecting
         the  enforcement  generally  of  creditors'  rights and  remedies,  (B)
         general  principles of equity  (regardless  of whether  considered in a
         proceeding at law or in equity),  including the discretion of any court
         of competent  jurisdiction  in granting  specific  performance or other
         equitable  relief,  and (C) an  implied  duty to take  action  and make
         determinations on a reasonable basis and in good faith.

                  (b) HRPT hereby represents and warrants to Senior Housing that
         (i) each Transferred  Subsidiary is a real estate investment trust duly
         formed and validly  existing  under the laws of the State of  Maryland,
         (ii) the Subsidiary Shares have been duly authorized and issued and are
         fully  paid  and  nonassessable,  and  (iii)  immediately  prior to the
         contribution of the Subsidiary Shares to Senior Housing on September 1,
         1999 as described in Section 2.2, the Subject Shares were owned by HRPT
         free of any  adverse  claims  (within  the  meaning of Article 8 of the
         Uniform  Commercial Code as in effect in Massachusetts) and constituted
         all of the  issued  and  outstanding  shares of  capital  stock of each
         Transferred  Subsidiary,  and no Person  other than Senior  Housing had
         have any option or other  right to acquire  shares of capital  stock of
         any Transferred Subsidiary.

                  (c) Senior Housing represents and warrants to HRPT (i) that it
         is aware that the offering and sale of the Subsidiary  Shares  pursuant
         to this  Agreement  has not been and will not be  registered  under the
         Securities  Act and (ii) that Senior  Housing  acquired the  Subsidiary
         Shares without a view to any  distribution  thereof which would require
         registration under the Securities Act.

                  (d) EACH OF HRPT AND SENIOR  HOUSING  ACKNOWLEDGES  AND AGREES
         THAT NEITHER OF THEM HAS MADE AND NEITHER OF THEM IS MAKING ANY EXPRESS
         OR IMPLIED  REPRESENTATIONS  OR WARRANTIES  WHATSOEVER  (INCLUDING  ANY
         IMPLIED  WARRANTY OF  MERCHANTABILITY  OR OF FITNESS FOR ANY PARTICULAR
         PURPOSE,  EACH OF WHICH IS HEREBY  EXPRESSLY  DISCLAIMED) IN CONNECTION
         WITH THIS AGREEMENT OR THE TRANSACTIONS  CONTEMPLATED  HEREBY.  Without
         limiting  the  generality  of the  foregoing,  each of HRPT and  Senior
         Housing acknowledges and agrees that neither of them
         is making any  representation  or warranty  of any  nature,  express or
         implied,  as to (i) the value or freedom  from  encumbrance  of, or any
         other  matter  concerning,   the  Subsidiary  Shares,  the  Transferred
         Subsidiaries  or  their  properties,  assets  or  liabilities,  or  the
         properties,  assets or liabilities of any party to this Agreement, (ii)
         any past,  present or future income,  expenses or results of operations
         or cash  flow of the  Premises  or the  Transferred  Subsidiaries,  any
         projections, the financial viability of the Premises or the Transferred
         Subsidiaries,  the  creditworthiness  of any  tenants  under the Tenant
         Leases  or any  guarantor  thereof  (it  being  acknowledged  by Senior
         Housing that some of such tenants or guarantors or their parent



                                       -8-

<PAGE>



         companies  have recently had  materially  adverse  changes in financial
         position  and  are or may be in  financial  distress  or in  bankruptcy
         proceedings),  or the  completeness or accuracy of any books or records
         of HRPT or any Transferred Subsidiary pertaining to the Premises; (iii)
         the validity or binding effect or  enforceability  of any Tenant Leases
         or Contracts,  (iv) the legal  sufficiency of any instrument  conveying
         title  to any  asset  transferred  pursuant  to this  Agreement  or any
         related  agreement,  including  the transfer of the Premises and Tenant
         Leases to the Transferred Subsidiaries,  or (v) the Premises or matters
         affecting the Premises,  including physical condition,  title to or the
         boundaries of the real property constituting the Premises, pest control
         matters,  soil  conditions,   environmental  matters,  compliance  with
         building,  health,  safety,  environmental,  land use and zoning  laws,
         regulations  and orders  (including  compliance with the Americans with
         Disabilities  Act or any  related  regulations),  absence of  hazardous
         materials,  operation of  mechanical  systems,  equipment and fixtures,
         suitability  of soil or  geology,  absence of defects,  structural  and
         other  engineering  characteristics,  quality of construction,  traffic
         patterns,  market data,  economic  conditions or  projections,  and any
         other information pertaining to the Premises or the market and physical
         environments in which they are located. SENIOR HOUSING ACKNOWLEDGES AND
         AGREES  THAT  THE  PREMISES  WERE   TRANSFERRED   TO  THE   TRANSFERRED
         SUBSIDIARIES "AS IS, WHERE IS, WITH ALL FAULTS."

                  (e) Without  limiting  the  provisions  of  subsection  2.4(d)
         above, Senior Housing,  for itself and its subsidiaries  (including the
         Transferred  Subsidiaries)  and its and their successors and assignees,
         hereby  releases  HRPT and its  subsidiaries,  shareholders,  officers,
         employees,  agents,  successors  and assigns from and waives all claims
         and  liability  against  HRPT  and  its   subsidiaries,   shareholders,
         officers,  employees,  agents, successors and assigns connected with or
         arising out of any structural, physical, or environmental condition in,
         at,  about or under the  Premises  and  further  releases  HRPT and its
         subsidiaries, shareholders, officers, employees, agents, successors and
         assigns from and waives all claims and  liability  against HRPT and its
         subsidiaries, shareholders, officers, employees, agents, successors and
         assigns  attributable  to the  structural,  physical and  environmental
         condition  and  quality  of  the  Premises,   including  the  presence,
         discovery or removal of any hazardous  materials in, at, about or under
         any of the Premises,  or for,  connected with or arising out of any and
         all  claims  or  causes  of action  based  upon  CERCLA  (Comprehensive
         Environmental  Response,  Compensation  and  Liability  Act of 1980, as
         amended, and as may be further amended from time to time), or any other
         federal or state laws or regulations relating to environmental  matters
         in, at, about or under any of the Premises. As between HRPT, on the one
         hand,  and  the  respective  Transferred  Subsidiaries  which  own  the
         Premises,   on  the  other,   each   Transferred   Subsidiary   assumes
         responsibility  and liability  for all  obligations  (past,  present or
         future)  attributable to any hazardous materials in, at, about or under
         the Premises  which it owns at the Effective  Date or the  Distribution
         Date, which  responsibilities  and liabilities will be retained by such
         Transferred  Subsidiary  when its Subsidiary  Shares are transferred by
         HRPT to Senior Housing.

                  (f) For  purposes of this  Section  2.4,  the term  "hazardous
         material"  shall mean any asbestos or  asbestos-containing  material or
         any  substance,  chemical,  waste,  oil or other  petroleum  product or
         material that is or becomes regulated by any federal, state or local



                                       -9-

<PAGE>



         governmental   authority  because  of  its  toxicity,   infectiousness,
         radioactivity,    explosiveness,    ignitability,    corrosiveness   or
         reactivity.

                  (g)  Notwithstanding  anything  herein  to the  contrary,  the
         acknowledgments and agreements of the parties set forth in this Section
         2.4 shall survive the Distribution Date and the payment of the Deferred
         Payment and shall be enforceable at any time.


SECTION 3         POST-DISTRIBUTION COVENANTS.

         3.1 Operations and  Investments  of HRPT and Senior  Housing.  HRPT and
Senior  Housing hereby  acknowledge  and agree that for so long as (a) HRPT owns
10% or more of the Senior Housing Common Shares, (b) the Advisor or an Affiliate
thereof serves as advisor for both HRPT and Senior Housing,  or (c) any Managing
Trustee of Senior Housing is also a Managing Trustee of HRPT, HRPT will not make
any  investment  (which may include,  without  limitation,  fee interests in the
underlying  property or  leaseholds,  joint  ventures,  mortgages and other real
estate  interests) in a Senior Property without the prior approval of a majority
of Senior  Housing's  Independent  Trustees and Senior Housing will not make any
investment  in an Office  Property  without the prior  approval of a majority of
HRPT's  Independent  Trustees.  In any case where an investment is both a Senior
Property and an Office  Property,  such investment shall be classified as either
one or the other based on its  overriding  character as  determined  by rentable
square footage (excluding common areas). Nothing in this Section 3.1 shall apply
to any  investment  of HRPT in Senior  Properties  existing on the  Distribution
Date.

         3.2 Cooperation, Exchange of Information, and Retention of Records.

                  (a)  Upon   reasonable   request   prior  to  and   after  the
         Distribution  Date,  HRPT (on  behalf  of the HRPT  Group)  and  Senior
         Housing (on behalf of the Senior Housing Group) shall promptly provide,
         and shall cause their respective  Affiliates to provide, the requesting
         party  with  such  cooperation  and  assistance,  documents  and  other
         information,  without charge, as may be necessary or reasonably helpful
         in  connection   with  (i)  the   consummation   of  the   transactions
         contemplated by this Agreement and the  preservation for each party and
         for the Transferred  Subsidiaries,  to the extent reasonably  feasible,
         the  benefits  of this  Agreement  (including,  in the  case of  Senior
         Housing and the Transferred Subsidiaries,  the economic and operational
         benefits   of  the  Senior   Housing   Assets),   (ii)  the   continued
         qualification  of each of HRPT  and  Senior  Housing  as a real  estate
         investment  trust  under the Code,  including  the  enforcement  of the
         ownership   limitations  and  other   provisions  of  their  respective
         declarations  of trust  relating to the  preservation  of the status of
         each of HRPT and Senior Housing as a real estate investment trust under
         the Code, (iii) each party's  preparation and filing of any original or
         amended Tax Return, (iv) the conduct of any audit,  appeal,  protest or
         other  examination  or  any  judicial  or   administrative   proceeding
         involving to any extent  Taxes or Tax Returns  within the scope of this
         Agreement,  and (v) the verification of an amount payable hereunder to,
         or receivable  hereunder  from, the other party.  Each party shall make
         its officers and facilities available on a mutually convenient basis to
         facilitate such cooperation.



                                      -10-

<PAGE>



                  (b)  HRPT  and  Senior  Housing  shall  retain  or cause to be
         retained all books,  records and other documents  within its possession
         relating  to the  Premises,  the  Tenant  Leases  or the  Contracts  or
         otherwise to the Transferred  Subsidiaries or their properties,  assets
         or liabilities, and all Tax Returns, and all books, records, schedules,
         workpapers, and other documents relating thereto, which Tax Returns and
         other  materials  are  within  the scope of this  Agreement,  until the
         expiration of the later of (i) all  applicable  statutes of limitations
         (including any waivers or extensions  thereof),  and (ii) any retention
         period required by law or pursuant to any record  retention  agreement.
         The  parties  hereto  shall  provide  at least  thirty  (30) days prior
         written notice of any intended destruction of the documents referred to
         in the preceding sentence. A party giving such a notification shall not
         dispose of any of the foregoing  materials  without first  allowing the
         other party a reasonable opportunity to copy them at such other party's
         expense.

         3.3 Repayment of Senior Housing Formation Debt.

                  (a) As soon as  practicable  after the  Distribution,  but not
         later than the Deferred Payment Date, Senior Housing shall pay or cause
         SPTMRT  Properties Trust to pay the Deferred Payment in full,  together
         with all accrued and unpaid  interest  thereon,  in accordance with the
         terms hereof and the Note.  Senior  Housing  represents and warrants to
         HRPT that, after giving effect to the Distribution and the consummation
         of the  transactions  contemplated  by  Sections  2.1 and  2.2,  Senior
         Housing will have the right to borrow at least  $200,000,000  under the
         Senior  Housing  Credit  Facility and agrees to maintain that borrowing
         availability  until  the  Deferred  Payment  and all  accrued  interest
         thereon has been paid in full;  provided that the obligations of Senior
         Housing and SPTMRT  Properties  Trust to pay the  Deferred  Payment and
         interest  thereon  shall not be  limited  to  amounts  available  to be
         borrowed  under the Senior  Housing  Credit  Facility  and shall not be
         conditioned on the availability of funds thereunder.

                  (b) In the event that any portion of the Deferred  Payment and
         all accrued  interest  thereon  remains unpaid on the Deferred  Payment
         Date, Senior Housing agrees to cause SPTMRT Properties Trust to, and by
         its joinder to this Agreement below, SPTMRT Properties Trust agrees to,
         secure the obligations of Senior Housing and of SPTMRT Properties Trust
         to pay the  Deferred  Payment  and all  interest  accrued  or to accrue
         thereon within 10 days following the Deferred  Payment Date (and in any
         event by December 31, 1999) with a perfected,  first  mortgage  lien on
         the Premises owned by SPTMRT  Properties Trust on September 1, 1999 and
         perfected  first  assignments  of and security  interests in all Tenant
         Leases, all Contracts and other personal  property,  fixtures and other
         assets and rights  related to the  ownership,  operation and leasing of
         these  Premises,  pursuant to any  mortgages,  assignments,  securities
         agreements, financing statements and other security documents which may
         reasonably be requested by HRPT from time to time.  Senior Housing and,
         by its  joinder  to  this  Agreement  below,  SPTMRT  Properties  Trust
         acknowledges  and agrees that the performance of its obligations  under
         this Section 3.3 may be necessary for HRPT's  continuing  qualification
         as a real estate investment trust under the Code, that monetary damages
         would be insufficient to compensate HRPT for a breach by Senior Housing
         or SPTMRT Properties Trust of these obligations and, accordingly,  that
         HRPT shall be entitled,



                                      -11-

<PAGE>



         to the  extent  permitted  by  law,  to  request  and  obtain  specific
         performance of the obligations of Senior Housing and SPTMRT  Properties
         Trust under this Section 3.3 and to injunctive  relief  requiring  such
         performance.

         3.4 Covenants to Maintain REIT Qualification.  For so long as HRPT owns
more than 9.8% of the outstanding  Senior Housing Common Shares or 9.8% by value
of the outstanding  equity of Senior  Housing,  (a) HRPT will not acquire or own
more than 9.8% of the equity  (measured  by vote,  value,  capital  interests or
profits  interests) of any tenant of any member of the Senior Housing Group, (b)
HRPT will not  consent to any Person  owning  more than 9.8% of the  outstanding
beneficial  interests  in HRPT if the effect of such  ownership  would result in
rents  received  by any member of the  Senior  Housing  Group to not  qualify as
"rents from real property" within the meaning of Section 856(d) of the Code, and
(c) HRPT will not take any other action which, in the reasonable judgment of the
Senior Housing Board,  would reasonably be expected to have an adverse impact on
the ability of Senior  Housing to qualify as a "real  estate  investment  trust"
under  Sections 856 through 860 of the Code.  For so long as HRPT owns more than
9.8% of the  outstanding  Senior  Housing  Common Shares or 9.8% by value of the
outstanding equity of Senior Housing, (a) Senior Housing will not acquire or own
more than 9.8% of the equity  (measured  by vote,  value,  capital  interests or
profits interests) of any tenant of any member of the HRPT Group, and (b) Senior
Housing will not take any other action which, in the reasonable  judgment of the
HRPT  Board,  would  reasonably  be  expected  to have an adverse  impact on the
ability of HRPT to qualify as a "real estate  investment  trust" under  Sections
856 through 860 of the Code.

         3.5 Transfer of Senior Housing Shares.  During the period ending on the
first  anniversary of the  Distribution  Date,  HRPT will not sell,  transfer or
otherwise  dispose of any of the Senior Housing common shares owned by it on the
Distribution  Date (after giving effect to the  Distribution)  without the prior
approval of a majority of the Senior Housing Independent Trustees.

SECTION 4         DISTRIBUTION DATE ALLOCATIONS.

         4.1 GAAP Allocations.  For accounting purposes, all items of income and
expense relating to the Transferred  Subsidiaries  shall be allocated to HRPT in
respect of periods prior to (but excluding) the Distribution Date, and to Senior
Housing for all periods commencing on and after the Distribution Date.

         4.2 Cash Allocations. Notwithstanding the provisions of subsection 4.1,
the parties agree that:

                  (a) Except as otherwise  provided in subsection  4.2(c) below,
         HRPT  shall  be  entitled  to  receive  and  retain  all  cash and cash
         equivalents (including the proceeds of checks received or in process of
         collection  and  of  tenant  security   deposits)  of  the  Transferred
         Subsidiaries  at the time of the  Distribution,  regardless  of whether
         such cash or cash  equivalents  represent  the  proceeds of payments in
         respect of the  Premises,  the  Tenant  Leases or the  Contracts  which
         relate  to  periods  which  fall in whole  or in part on or  after  the
         Distribution  Date (and  Senior  Housing  acknowledges  that it and the
         Transferred  Subsidiaries will declare a dividend of such cash and cash
         equivalents payable to HRPT as holder of



                                      -12-

<PAGE>



         record of Senior Housing Common Shares prior to the Distribution  Date,
         even though such  dividend may be payable on or after the  Distribution
         Date);

                  (b) Senior Housing and the Transferred  Subsidiaries  shall be
         entitled to receive and retain all payments in respect of the Premises,
         the  Tenant  Leases  and  the  Contracts  which  are  received  by  the
         Transferred   Subsidiaries  from  and  after  the  Distribution   Date,
         regardless  of whether  the  payment  relates to periods  which fall in
         whole or in part prior to the Distribution Date; and

                  (c) Senior Housing and the Transferred  Subsidiaries  shall be
         entitled to retain,  and HRPT shall  transfer to Senior  Housing or the
         applicable Transferred  Subsidiaries,  any tenant, guarantor or similar
         deposits which are required pursuant to a Tenant Lease or a Contract to
         be maintained in a segregated  escrow  account,  and thereafter  Senior
         Housing or the applicable  Transferred  Subsidiary  shall agree to hold
         and maintain  such deposits in accordance  with the  applicable  Tenant
         Lease or Contract.  Any tenant,  guarantor or similar deposits pursuant
         to any Tenant Lease or Contract which are not required to be maintained
         in a segregated  escrow  account  will be retained by HRPT,  but Senior
         Housing  or the  applicable  Transferred  Subsidiary  will  assume  any
         obligations  to return or repay such  deposits in  accordance  with the
         applicable Tenant Lease or Contract.

         4.3 No Other Prorations.  Except as expressly  provided in Section 4.1,
4.2 or 6, there  shall be no  proration,  as between  HRPT and its  Subsidiaries
(exclusive of Senior Housing and the Transferred Subsidiaries), on the one hand,
and Senior Housing and the Transferred Subsidiaries, on the other, in respect of
rents, common area maintenance charges or other fixed or unfixed charges payable
under the Tenant Leases, fuel, electric, water or other utility costs, municipal
assessments  or  governmental  license  or permit  fees,  real  estate  Taxes or
assessments,  water rates or charges, sewer Taxes or rents, or any other item of
income or expense  relating to the Premises (or for any  adjustments  arrearages
therein or refunds thereof).  No insurance  policies of HRPT or its Subsidiaries
are to be transferred to Senior Housing and the Transferred Subsidiaries, and no
apportionment of the premiums therefor shall be made.

SECTION 5         SURVIVAL; INDEMNIFICATION.

         5.1 Indemnification by HRPT. From and after the Distribution Date, HRPT
shall indemnify and hold harmless Senior Housing,  its  Subsidiaries  (including
the Transferred  Subsidiaries),  each of their respective  directors,  trustees,
officers, employees and agents, and each of the heirs, executors, successors and
assigns of any of the foregoing  (collectively,  the "Senior Housing Indemnified
Parties") from and against any and all damages, claims, losses, expenses, costs,
obligations   and   liabilities,   including   liabilities  for  all  reasonable
attorneys',  accountants',  and  experts'  fees and  expenses,  including  those
incurred  to  enforce  the  terms  of  this  Agreement  (collectively,  "Covered
Liabilities"),   suffered,   directly  or  indirectly,  by  any  Senior  Housing
Indemnified Party by reason of, or arising out of:

                  (a) any breach of any covenant or agreement of HRPT  contained
         in this Agreement; or



                                      -13-

<PAGE>



                  (b) any Retained Liability.

         5.2 Indemnification by Senior Housing.  From and after the Distribution
Date,  Senior Housing shall indemnify and hold harmless HRPT, its  Subsidiaries,
each of their respective directors,  trustees,  officers,  employees and agents,
and each of the heirs, executors, successors and assigns of any of the foregoing
(collectively,  the "HRPT  Indemnified  Parties")  from and  against any and all
Covered Liabilities  suffered,  directly or indirectly,  by any HRPT Indemnified
Party by reason of, or arising out of:

                  (a) any breach of any covenant or agreement of Senior  Housing
         contained in this Agreement; or

                  (b) any Senior Housing Liability.

         5.3 Indemnification Procedures.

                  (a) If any indemnified  party receives notice of the assertion
         of any Third-Party Claim with respect to which an indemnifying party is
         obligated  under  this  Agreement  to  provide  indemnification,   such
         indemnified  party shall give such  indemnifying  party written  notice
         thereof  (together with a copy of such  Third-Party  Claim,  process or
         other legal pleading) promptly after becoming aware of such Third-Party
         Claim; provided,  however, that the failure of any indemnified party to
         give  notice as  provided  in this  Section  5.3 shall not  relieve any
         indemnifying  party of its obligations  under this Section 5, except to
         the extent that such indemnifying party is actually  prejudiced by such
         failure to give notice.  Such notice shall  describe  such  Third-Party
         Claim in reasonable detail.

                  (b) An indemnifying  party, at such  indemnifying  party's own
         expense and through  counsel chosen by such  indemnifying  party (which
         counsel shall be reasonably  acceptable to the indemnified  party), may
         elect to defend any Third-Party  Claim. If an indemnifying party elects
         to defend a  Third-Party  Claim,  then,  within ten (10)  business days
         after receiving  notice of such  Third-Party  Claim (or sooner,  if the
         nature of such Third-Party claim so requires),  such indemnifying party
         shall  notify  the  indemnified  party of its intent to do so, and such
         indemnified  party shall  cooperate in the defense of such  Third-Party
         Claim  (and  pending  such  notice  and   assumption  of  defense,   an
         indemnified   party  may  take  such  steps  to  defend   against  such
         Third-Party Claim as, in such indemnified party's good-faith  judgment,
         are appropriate to protect its interests). The indemnifying party shall
         pay such indemnified party's reasonable out-of-pocket expenses incurred
         in connection with such cooperation.  After notice from an indemnifying
         party to an indemnified  party of its election to assume the defense of
         a Third-Party Claim, such indemnifying party (i) shall not be liable to
         such  indemnified  party  under  this  Section 5 for any legal or other
         expenses  subsequently incurred by such indemnified party in connection
         with the defense  thereof other than those expenses  referred to in the
         preceding   sentence,   and  (ii)  shall  keep  the  indemnified  party
         reasonably  informed of the status of the  defense of such  Third-Party
         Claim;  provided,  however,  that such indemnified party shall have the
         right to employ one law firm as counsel, together with a separate local
         law firm in each applicable jurisdiction ("Separate Counsel"),



                                      -14-

<PAGE>



         to represent such  indemnified  party in any action or group of related
         actions  (which firm or firms  shall be  reasonably  acceptable  to the
         indemnifying party) if, in such indemnified party's reasonable judgment
         at any time,  either a conflict of interest  between  such  indemnified
         party and such  indemnifying  party exists in respect of such claim, or
         there may be defenses  available  to such  indemnified  party which are
         different from or in addition to those  available to such  indemnifying
         party and the  representation of both parties by the same counsel would
         be  inappropriate,  and in that  event  (i)  the  reasonable  fees  and
         expenses of such Separate  Counsel  shall be paid by such  indemnifying
         party (it being understood,  however, that the indemnifying party shall
         not be  liable  for the  expenses  of more  than one  Separate  Counsel
         (excluding  local counsel) with respect to any Third-Party  Claim (even
         if  against  multiple  indemnified  parties),  and  (ii)  each  of such
         indemnifying  party and such indemnified  party shall have the right to
         conduct its own defense in respect of such  claim.  If an  indemnifying
         party elects not to defend  against a  Third-Party  Claim,  or fails to
         notify an indemnified party of its election as provided in this Section
         5.3 within the period of ten (10) (or, if applicable,  fewer)  business
         days described above, the indemnified party may defend, compromise, and
         settle such Third-Party Claim and shall be entitled to  indemnification
         hereunder (to the extent permitted hereunder);  provided, however, that
         no such indemnified party may compromise or settle any such Third-Party
         claim  without the prior  written  consent of the  indemnifying  party,
         which   consent  shall  not  be   unreasonably   withheld  or  delayed.
         Notwithstanding  the  foregoing,  the  indemnifying  party  shall  not,
         without the prior written consent of the indemnified  party, (i) settle
         or  compromise  any  Third-Party  Claim or  consent to the entry of any
         judgment  which does not include as an  unconditional  term thereof the
         delivery by the  claimant or plaintiff  to the  indemnified  party of a
         written  release  from all  liability  in respect  of such  Third-Party
         Claim, or (ii) settle or compromise any Third-Party Claim in any manner
         that would  reasonably be expected to have a material adverse effect on
         the indemnified party.

         5.4 Certain Limitations, Etc.

                  (a)  The  amount  of  any   Covered   Liabilities   for  which
         indemnification  is provided under this  Agreement  shall be net of any
         amounts actually  recovered by the indemnified party from third parties
         (including  amounts actually  recovered under insurance  policies) with
         respect to such Covered  Liabilities.  Any indemnifying party hereunder
         shall be subrogated to the rights of the indemnified party upon payment
         in full of the amount of the relevant  indemnifiable  loss.  An insurer
         who would otherwise be obligated to pay any claim shall not be relieved
         of the responsibility  with respect thereto or, solely by virtue of the
         indemnification  provision  hereof,  have any  subrogation  rights with
         respect  thereto.  If any  indemnified  party recovers an amount from a
         third   party  in   respect   of  an   indemnifiable   loss  for  which
         indemnification  is provided in this Agreement after the full amount of
         such indemnifiable loss has been paid by an indemnifying party or after
         an indemnifying  party has made a partial payment of such indemnifiable
         loss and the amount received from the third party exceeds the remaining
         unpaid balance of such  indemnifiable  loss, then the indemnified party
         shall  promptly remit to the  indemnifying  party the excess of (i) the
         sum of the  amount  theretofore  paid by  such  indemnifying  party  in
         respect of such indemnifiable loss plus the



                                      -15-

<PAGE>



         amount received from the third party in respect thereof,  less (ii) the
         full amount of such Covered Liabilities.

                  (b) NO  REMEDY  UNDER  THIS  AGREEMENT  OR AT LAW OR IN EQUITY
         SHALL  INCLUDE,   PROVIDE  FOR  OR  PERMIT  THE  PAYMENT  OF  MULTIPLE,
         EXEMPLARY,   PUNITIVE  OR   CONSEQUENTIAL   DAMAGES  OR  ANY  EQUITABLE
         EQUIVALENT THEREOF OR SUBSTITUTE THEREFOR.

         5.5  Priority of Section 6. As to the Tax matters  addressed in Section
6,  including the  indemnification  for Taxes and the control and conduct of Tax
Contests,  the  provisions  of  Section  6  shall  be  the  exclusive  governing
provisions.

SECTION 6         TAX MATTERS.

         6.1 General Responsibility for Taxes.

                  (a) All federal  Income Taxes of the HRPT Group shall be borne
         by, shall be the  responsibility of, and shall be paid by HRPT, and all
         federal  Income  Taxes of the Senior  Housing  Group shall be borne by,
         shall be the  responsibility  of, and shall be paid by Senior  Housing.
         For purposes of federal  Income  Taxes,  items of income,  gain,  loss,
         deduction,  expenditure,  and credit shall be allocated and apportioned
         between the HRPT Group and the Senior  Housing  Group in the  following
         manner.  Any item relating to the Senior  Housing  Assets or the Senior
         Housing Business shall be: (i) allocated  exclusively to the HRPT Group
         if such item is in respect of a period ending  before the  Distribution
         Date;  (ii)  allocated  exclusively to the Senior Housing Group if such
         item is in respect of a period commencing after the Distribution  Date;
         and (iii)  apportioned  between  the HRPT Group and the Senior  Housing
         Group in a manner  consistent  with (A)  applicable  Tax laws,  (B) the
         continued  qualification of both HRPT and Senior Housing as real estate
         investment  trusts under the Code, and (C) commercially  reasonable pro
         rations of items  between  buyers and sellers of real  estate,  if such
         item is in respect of a period that includes the Distribution Date.

                  (b) For any state or local  Income  Tax that  follows  Section
         856(i) of the Code (i) such  state and local  Income  Taxes of the HRPT
         Group shall be borne by, shall be the  responsibility  of, and shall be
         paid by HRPT,  and (ii) such state and local Income Taxes of the Senior
         Housing  Group shall be borne by, shall be the  responsibility  of, and
         shall be paid by Senior  Housing.  For purposes of such state and local
         Income Taxes, items of income, gain, loss, deduction,  expenditure, and
         credit shall be allocated  and  apportioned  between the HRPT Group and
         the Senior Housing Group in the same manner as Section 6.1(a).

                  (c) HRPT shall hold Senior  Housing  harmless from and against
         all  Taxes  which are to be borne by HRPT  under  Section  6.1.  Senior
         Housing  shall hold HRPT  harmless from and against all Taxes which are
         to be borne by Senior Housing under Section 6.1.

         6.2 Allocation of Certain Taxes Among Taxable Periods.  HRPT and Senior
Housing agree that if Senior  Housing or any member of the Senior  Housing Group
is permitted but not



                                      -16-

<PAGE>



required  under any  applicable Tax law,  including  applicable  state and local
Income  Tax  laws,  to  treat  the  day  before  the  Distribution  Date  or the
Distribution  Date as the last day of a Taxable period,  HRPT and Senior Housing
shall  cooperate  so that such day will be  treated as the last day of a Taxable
period.

         6.3 Filing and Payment Responsibility.

                  (a) From and after  the  Distribution  Date,  each of HRPT (on
         behalf of the HRPT  Group) and Senior  Housing (on behalf of the Senior
         Housing Group) shall cause to be prepared and filed such Tax Returns as
         the HRPT Group and the Senior Housing Group, respectively, are required
         to file with applicable Taxing Authorities.  Each of HRPT (on behalf of
         the HRPT  Group) and Senior  Housing  (on behalf of the Senior  Housing
         Group) agree that,  except as required by applicable law, they will not
         take  positions in any such Tax Return that are  inconsistent  with (i)
         the  description  of  federal  Income  Tax  consequences  in the Senior
         Housing Registration  Statement and (ii) any other Tax Return,  whether
         filed  on  behalf  of the  HRPT  Group  or the  Senior  Housing  Group,
         previously  or  substantially  contemporaneously  filed  with  such Tax
         Return.  In particular,  the parties will use all  reasonable  business
         efforts to cooperate with one another in valuing the individual  assets
         comprising the Senior Housing Assets on the  Distribution  Date, to the
         extent such valuations are necessary for Tax purposes.

                  (b) To the extent  that either of the HRPT Group or the Senior
         Housing Group bears responsibility  pursuant to Section 6.1 for some or
         all of a Tax which is to be paid with a Tax  Return for which the other
         bears  preparation and filing  responsibility  pursuant to Section 6.3,
         then (i) the party bearing  responsibility  for some or all of such Tax
         shall  have the right to review  and  comment  upon such Tax  Return at
         least fifteen (15) days before such Tax Return must be filed,  and (ii)
         the party bearing  responsibility for some or all of such Tax shall pay
         over  by  wire  transfer  the  amount  of  such  Tax  for  which  it is
         responsible to the party filing such Tax Return at least three (3) days
         before such Tax Return must be filed,  and (iii) the party  responsible
         for  preparing  and filing such Tax Return will file such Tax Return on
         or before its due date and pay over to the applicable  Taxing Authority
         the amount of Tax due with such Tax Return.

         6.4 Refunds and  Credits.  Any refunds or credits of Taxes shall be for
the account of the party  bearing  responsibility  for such Taxes under  Section
6.1. Each of HRPT and Senior  Housing  agrees that if as the result of any audit
adjustment made by any Taxing Authority with respect to a Tax to be borne by the
other  party  under  Section  6.1,  any  member of the HRPT  Group or the Senior
Housing Group, respectively, receives a Tax benefit in the form of a cash refund
or in the form of a credit  applicable  against Tax  liabilities  to be borne by
such benefited party under this Section 6, then the benefited party shall notify
the other  party of the same within ten (10) days of, as  applicable,  receiving
the cash refund or filing the Tax Return in which such credit is  utilized,  and
then pay over  immediately  to such other party the amount of such Tax refund or
credit.

         6.5 Tax  Contests.  If either  HRPT (on  behalf  of the HRPT  Group) or
Senior  Housing (on behalf of the Senior  Housing  Group)  becomes  aware of any
audit, pending or threatened assessment,



                                      -17-

<PAGE>



official  inquiry,  examination or proceeding ("Tax Contests") that could result
in  an  official  determination  with  respect  to  Taxes  due  or  payable  the
responsibility  for any portion of which rests with the other party,  such party
shall promptly so notify the other party in writing.  The party bearing  greater
responsibility  for the Taxes  contested  in a Tax Contest  shall bear the costs
(including  attorneys' and accountants' fees, but excluding the contested Taxes)
of such Tax  Contest,  and shall  control  and  conduct  such Tax  Contest  in a
reasonable manner after consulting in good faith with the other party. The other
party shall  supply the party  controlling  the Tax contest  with such powers of
attorney and assistance as may be reasonably  requested.  The responsibility for
any  additional  liability  for  Taxes  resulting  from a Tax  Contest  shall be
allocated and apportioned between the HRPT Group and the Senior Housing Group in
accordance  with  Section  6.1.  Except  to the  extent  in  conflict  with  the
provisions of this Section 6, the  provisions of Section 5.3 shall be applicable
to Tax Contests.

         6.6  Resolution  of  Disputes.  At the request of either HRPT or Senior
Housing,  any  disputes  between  HRPT (on behalf of the HRPT  Group) and Senior
Housing (on behalf of the Senior Housing Group) with respect to matters governed
by  this  Section  6 shall  be  resolved  through  an  arbitration  by a firm of
independent  certified  public  accountants,  mutually  agreed  upon by HRPT and
Senior  Housing and having no material  relationship  with either HRPT or Senior
Housing,  whose  determination  shall be final and binding on both parties.  The
cost of such firm shall be borne equally by HRPT and Senior Housing.

SECTION 7         MISCELLANEOUS.

         7.1  Arbitration.  The  Parties  agree  that any and all  disputes  and
disagreements  arising out of or relating to this Agreement,  other than actions
or claims for  injunctive  relief or claims  raised in  actions  or  proceedings
brought by third  parties and other than  disputes  under  Section 6 as to which
either party elects to apply the  provisions  of Section 6.6,  shall be resolved
through  negotiations  or, if the dispute is not so  resolved,  through  binding
arbitration  conducted  in Boston,  Massachusetts  under the  J.A.M.S./Endispute
Comprehensive Arbitration Rules and Procedures, with the following amendments to
those rules.  First,  the parties  agree that in no event shall the  arbitration
from commencement to issuance of an award take longer than 180 days. Second, the
parties agree that the arbitration  tribunal shall consist of three  arbitrators
and that the Parties elect not to have the optional  appeal  procedure  provided
for in Rule 23. Third,  in lieu of the  depositions  permitted in Rule 15(E) and
(F) the parties agree that the only depositions  shall be a single deposition to
last no longer than one  six-hour  day that each party may take of the  opposing
party or an individual under the control of the opposing party.  Judgment on the
award  rendered  by  the   arbitrators  may  be  entered  in  any  court  having
jurisdiction thereof.

         7.2  Confidentiality.  Each  party  hereto  shall  use  its  reasonable
business efforts to maintain the  confidentiality of any information  concerning
the other party or any  Subsidiary of the other party  provided to or discovered
by it  or  its  representatives  and  which  is  not  otherwise  available  on a
nonconfidential  basis to such party and shall not (except as may  otherwise  be
required by applicable  law or the rules and  regulations  of the New York Stock
Exchange) disclose such information,  subject to the provisions of this Section,
to anyone  other than those people who have a need to know such  information  in
connection with the conduct of such party's business, including



                                      -18-

<PAGE>



its attorneys,  accountants and other  representatives  and agents or during the
course of or in connection  with any Action based upon or in connection with the
subject matter of this Agreement.

         7.3 Notices.

                  (a) Any and all notices, demands, consents, approvals, offers,
         elections  and other  communications  required or permitted  under this
         Agreement shall be deemed  adequately  given if in writing and the same
         shall  be  delivered   either  in  hand,  by  telecopier  with  written
         confirmation  of  receipt,  or by mail or  Federal  Express  or similar
         expedited commercial carrier, addressed to the recipient of the notice,
         postpaid and registered or certified with return receipt  requested (if
         by mail), or with all freight charges prepaid (if by Federal Express or
         similar carrier).

                  (b) All notices  required or  permitted  to be sent  hereunder
         shall be deemed to have been given for all  purposes of this  Agreement
         upon  the date of  acknowledged  receipt,  in the  case of a notice  by
         telecopier,  and,  in all  other  cases,  upon the date of  receipt  or
         refusal,  except that whenever  under this Agreement a notice is either
         received  on a day which is not a  business  day or is  required  to be
         delivered on or before a specific day which is not a business  day, the
         day of receipt or required delivery shall  automatically be extended to
         the next business day.

                  (c) All such notices shall be addressed,

         If to Senior Housing, to:

                  Senior Housing Properties Trust
                  400 Centre Street
                  Newton, Massachusetts  02458
                  Attn:  President
                  Telecopier No. (617) 332-2261

         If to HRPT, to:

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

                  (d) By notice given as herein provided, the parties hereto and
         their respective  successors and assigns shall have the right from time
         to time and at any time  during  the term of this  Agreement  to change
         their respective  addresses effective upon receipt by the other parties
         of such  notice and each shall have the right to specify as its address
         up to two other addresses within the United States of America.




                                      -19-

<PAGE>



         7.4 Waivers,  Etc. No provision of this  Agreement may be waived except
by a written instrument signed by the party waiving compliance. No waiver by any
party hereto of any of the requirements  hereof or of any of such party's rights
hereunder  shall  release  the  other  parties  from full  performance  of their
remaining  obligations  stated  herein.  No  failure  to  exercise  or  delay in
exercising on the part of any party hereto any right, power or privilege of such
party  shall  operate  as a waiver  thereof,  nor  shall any  single or  partial
exercise of any right, power or privilege preclude any other or further exercise
thereof or the  exercise of any other  right,  power or privilege by such party.
This Agreement may not be amended, nor shall any waiver,  change,  modification,
consent or discharge be effected, except by an instrument in writing executed by
or on behalf of the party against whom  enforcement  of any  amendment,  waiver,
change, modification, consent or discharge is sought.

         7.5 Assignment;  Successors and Assigns.  This Agreement and all rights
and  obligations  hereunder  shall not be  assignable  by any party  without the
written  consent of the other  parties,  except to a successor  to such party by
merger or  consolidation  or an assignee of  substantially  all of the assets of
such party.  This Agreement shall be binding upon and shall inure to the benefit
of the parties hereto and their  respective  successors  and permitted  assigns.
This  Agreement  is not intended and shall not be construed to create any rights
in or to be enforceable in any part by any other Person.

         7.6  Severability.  If any provision of this Agreement shall be held or
deemed to be, or shall in fact be,  invalid,  inoperative  or  unenforceable  as
applied to any particular case in any jurisdiction or  jurisdictions,  or in all
jurisdictions or in all cases, because of the conflict of any provision with any
constitution  or statute or rule of public policy or for any other reason,  such
circumstance  shall not have the effect of rendering the provision or provisions
in question invalid,  inoperative or unenforceable in any other  jurisdiction or
in any  other  case or  circumstance  or of  rendering  any other  provision  or
provisions herein contained invalid,  inoperative or unenforceable to the extent
that such other  provisions  are not  themselves  actually in conflict with such
constitution,  statute or rule of public  policy,  but this  Agreement  shall be
reformed and  construed  in any such  jurisdiction  or case as if such  invalid,
inoperative or unenforceable  provision had never been contained herein and such
provision  reformed so that it would be valid,  operative and enforceable to the
maximum extent permitted in such jurisdiction or in such case.

         7.7  Counterparts,  Etc. This  Agreement may be executed in two or more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together  shall  constitute  one  and  the  same   instrument.   This  Agreement
constitutes  the entire  agreement  of the parties  hereto  with  respect to the
subject  matter  hereof  and  shall  supersede  and take the  place of any other
instruments  purporting to be an agreement of the parties hereto relating to the
subject  matter  hereof.  This  Agreement  may not be amended or modified in any
respect other than by the written agreement of all of the parties hereto.

         7.8 Governing  Law. This  Agreement  shall be  interpreted,  construed,
applied  and  enforced  in  accordance  with  the  laws of The  Commonwealth  of
Massachusetts  applicable to contracts between residents of Massachusetts  which
are to be performed entirely within Massachusetts.



                                      -20-

<PAGE>



         7.9 Expenses.  HRPT agrees to pay and to hold Senior  Housing  harmless
from and against (a) all costs,  expenses and fees  (including  in each case the
reasonable fees and disbursements of counsel),  whether incurred by HRPT, Senior
Housing or a Transferred Subsidiary,  incident to (i) the drafting, preparation,
execution and delivery of this Agreement and all other  agreements,  instruments
and other  documents  entered into by HRPT,  Senior  Housing or the  Transferred
Subsidiaries in connection  herewith or in connection  with the  Distribution or
consummation  of  the  other   transactions   contemplated   hereby,   (ii)  the
preparation,  printing,  filing and distribution under the Securities Act of the
Senior  Housing  Registration  Statement  (including  financial  statements  and
exhibits),  each preliminary  prospectus and prospectus in connection  therewith
and all amendments and  supplements to any of them,  (iii) the  registration  or
qualification  of the Senior  Housing Common Shares for offer and sale under the
securities,  Blue Sky or real estate  syndication  laws of the several states in
connection with the Distribution, (iv) the initial listing of the Senior Housing
Common Shares on the New York Stock Exchange and (v)  furnishing  such copies of
the  Senior  Housing  Registration  Statement,  the final  prospectus  contained
therein and all amendments and  supplements  thereto as may be requested for use
by  tranferors  thereof who are required to deliver a prospectus  in  connection
with the Distribution, (b) the fees and expenses of the Agent in connection with
the  Distribution,  (c) all costs,  expenses and fees (including any up-front or
structuring  fees,  any mortgage  recording  fees or taxes and all costs and the
reasonable  fees and  disbursements  of counsel  for Senior  Housing and for any
lenders or agents),  in connection with or incident to the  establishment of, or
the drafting,  preparation,  execution  and delivery of any and all  agreements,
instruments  and  other  documents   entered  into  by  Senior  Housing  or  any
Transferred Subsidiaries in connection with, the Senior Housing Credit Facility,
and (d) all real  property  transfer  Taxes,  including  Taxes  levied  upon the
transfer  of equity in an Entity  owning  real  estate  assets,  and all excise,
sales,   use,  value  added,   registration   stamp,   recording,   documentary,
conveyancing,  franchise,  property,  transfer, gains and similar Taxes, levies,
charges and fees, including any deficiencies,  interest, penalties, additions to
Tax or additional  amounts  excluding  any Income Taxes,  incurred in connection
with the transactions  contemplated by this Section 7.9. HRPT and Senior Housing
shall take all  reasonable  actions in making  efforts to minimize the amount of
transfer  Taxes,   and  shall  cooperate  with  one  another  in  providing  any
appropriate exemption certifications or other similar documentation.

         7.10 Section and Other Headings; Interpretation. The headings contained
in this  Agreement  are for  reference  purposes  only and  shall not in any way
affect the meaning or  interpretation  of this  Agreement.  The words  "hereof",
"herein" and "hereunder" and words of similar import when used in this Agreement
shall refer to this Agreement as a whole and not to any particular  provision of
this Agreement; and Section, subsection,  Schedule and Exhibit references are to
this Agreement,  unless otherwise specified. The words "including" and "include"
shall be deemed to be followed by the words "without limitation."

         7.11 Exculpation.  THE DECLARATIONS OF TRUST  ESTABLISHING HRPT, SENIOR
HOUSING  AND  SPTMRT  PROPERTIES  TRUST,  COPIES  OF  WHICH,  TOGETHER  WITH ALL
AMENDMENTS THERETO (THE  "DECLARATIONS"),  ARE DULY FILED WITH THE DEPARTMENT OF
ASSESSMENTS AND TAXATION OF THE STATE OF MARYLAND,  PROVIDE THAT THE NAMES "HRPT
PROPERTIES  TRUST," "SENIOR  HOUSING  PROPERTIES  TRUST" AND "SPTMRT  PROPERTIES
TRUST" REFER TO THE TRUSTEES



                                      -21-

<PAGE>



UNDER  EACH  DECLARATION  COLLECTIVELY  AS  TRUSTEES,  BUT NOT  INDIVIDUALLY  OR
PERSONALLY,  AND THAT NO  TRUSTEE,  OFFICER,  SHAREHOLDER,  EMPLOYEE OR AGENT OF
HRPT,  SENIOR HOUSING OR SPTMRT  PROPERTIES  TRUST, AS THE CASE MAY BE, SHALL BE
HELD TO ANY PERSONAL LIABILITY,  JOINTLY OR SEVERALLY, FOR ANY OBLIGATION OF, OR
CLAIM AGAINST,  HRPT, SENIOR HOUSING OR SPTMRT PROPERTIES TRUST, AS THE CASE MAY
BE. ALL PERSONS DEALING WITH HRPT, SENIOR HOUSING OR SPTMRT PROPERTIES TRUST, IN
ANY WAY,  SHALL  LOOK  ONLY TO THE  ASSETS  OF HRPT,  SENIOR  HOUSING  OR SPTMRT
PROPERTIES  TRUST,  AS THE  CASE  MAY  BE,  FOR  THE  PAYMENT  OF ANY SUM OR THE
PERFORMANCE OF ANY OBLIGATION. THE PROVISIONS OF THIS SECTION 7.11 SHALL SURVIVE
THE DISTRIBUTION OF SENIOR HOUSING COMMON SHARES.

         IN WITNESS  WHEREOF,  the  parties  have caused  this  Agreement  to be
executed as a sealed instrument as of the date first above written.

                               HRPT PROPERTIES TRUST



                               By: /s/ John Popeo
                                  Title: Treasurer, Chief Financial Officer
                                         and Secretary


                               SENIOR HOUSING PROPERTIES TRUST



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


THE PROVISIONS OF SECTIONS 2.2 AND 3.3 APPLICABLE TO THE  UNDERSIGNED ARE HEREBY
ACCEPTED AND AGREED TO:

SPTMRT PROPERTIES TRUST



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




                                      -22-

<PAGE>



                                                                       EXHIBIT A



THIS NOTE WAS ORIGINALLY ISSUED IN A TRANSACTION  EXEMPT FROM REGISTRATION UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"). THIS NOTE HAS NOT
BEEN REGISTERED  UNDER THE SECURITIES ACT OR ANY APPLICABLE STATE SECURITIES LAW
OF ANY STATE AND MAY NOT BE  OFFERED,  SOLD,  PLEDGED OR  OTHERWISE  TRANSFERRED
UNLESS REGISTERED  PURSUANT TO OR EXEMPT FROM REGISTRATION  UNDER THE SECURITIES
ACT AND ANY OTHER APPLICABLE SECURITIES LAW.


                                 PROMISSORY NOTE


$200,000,000.00                                                September 1, 1999
                                                           Newton, Massachusetts

         FOR VALUE  RECEIVED,  SPTMRT  PROPERTIES  TRUST  ("SPTMRT")  and SENIOR
HOUSING  PROPERTIES  TRUST  ("Senior  Housing"),  each a  Maryland  real  estate
investment trust (each a "Maker" and together, the "Makers"), by this promissory
note (this "Note"),  promise unconditionally and jointly and severally to pay to
HRPT  PROPERTIES  TRUST,  a Maryland real estate  investment  trust  ("HRPT") or
registered  assigns (the  "Holder")  the  principal  sum of TWO HUNDRED  MILLION
DOLLARS  ($200,000,000.00),  on the Deferred  Payment  Date (as defined  below),
together with any accrued but unpaid interest on the principal  amount from time
to time outstanding hereunder as set forth below.

         This Note shall bear interest on the principal amount from time to time
outstanding  hereunder  from the date hereof to and  including the date on which
the principal  amount  outstanding  hereunder is repaid in full,  payable on the
Deferred  Payment  Due Date  and  thereafter  on  demand,  at a rate  per  annum
determined for each day equal to HRPT's weighted average effective interest rate
on its  indebtedness  for money  borrowed on such day (as  determined by HRPT in
good faith), but in no event exceeding the maximum rate permitted by law.

         The Makers may prepay  principal  of this Note in part or in whole from
time to time without  premium or penalty,  but together  with accrued and unpaid
interest on the principal amount prepaid.

         As used herein,  the term "Deferred  Payment Date" means the earlier to
occur  of  (i)  the  10th  day  following  the  date  of the  distribution  (the
"Distribution")  of a number of common shares of beneficial  interest,  $.01 par
value of Senior Housing (the "Senior  Housing Common Shares") by HRPT to holders
of  common  shares of  beneficial  interest,  $.01 par value of HRPT (the  "HRPT
Common  Shares") equal to one tenth (1/10th) of the number of HRPT Common Shares
which are issued and  outstanding on the record date for the  Distribution,  and
(ii) December 31, 1999.





<PAGE>



         All payments of principal,  interest and other amounts payable on or in
respect of this Note or the  indebtedness  evidenced hereby shall be made to the
Holder at such places  within the United  States of America as the Holder  shall
from time to time  designate  in lawful  money of the United  States of America.
Payments hereunder shall be made in immediately available funds.

         Without limitation of any other right or remedy of the Holder hereunder
or under the Transaction  Agreement,  if the Makers or any of them shall fail to
pay the entire principal amount of this Note on or prior to the Deferred Payment
Date, then without  further demand from the Holder,  SPTMRT shall within 10 days
following  the  Deferred  Payment  Date (and in any case by December  31,  1999)
secure its obligations under this Note with a perfected,  first mortgage lien on
the land, improvement and fixtures owned by SPTMRT (including those described on
Schedule I hereto) together with any personal  property owned by SPTMRT and used
in connection  therewith (the "Premises") and perfected first assignments of and
security  interests  in  all  of the  tenant  leases  and  contracts  of  SPTMRT
identified  in  Schedule  II  hereto  and all of the  other  personal  property,
fixtures and other assets and rights  related to the  ownership,  operation  and
leasing of the Premises,  pursuant to such  mortgages,  assignments,  securities
agreements,   financing  statements  and  other  security  documents  which  may
reasonably be requested by the Holder from time to time.

         If any of the  Makers  shall  (i)  dissolve  or take any  action of its
shareholders  or board of trustees to dissolve,  (ii) commence or consent to any
case or  proceeding  under  any  federal  or  state  bankruptcy,  insolvency  or
reorganization  law or any  proceeding for  appointment of a trustee,  receiver,
custodian or similar  official  with respect to such Maker,  (iii) be subject to
any case or  proceeding  under any federal or state  bankruptcy,  insolvency  or
reorganization  law,  or  proceeding  for  appointment  of a trustee,  receiver,
custodian or similar official with respect to such Maker,  that continues for at
least sixty (60) days, (iv) make an assignment for the benefit of creditors,  or
(v) admit in writing its  inability  to pay,  or fail to pay,  its debts as they
mature, the entire unpaid principal of, and accrued and unpaid interest on, this
Note shall  automatically,  without any  requirement  of notice or action by the
Holder, become immediately due and payable.

         The  Makers  jointly  and  severally  will pay on  demand  all costs of
collection,  including all court costs and  reasonable  attorney's  fees paid or
incurred by the Holder in enforcing this Note upon default.

         All Makers, sureties,  guarantors and endorsers hereof, by executing or
endorsing this Note or by entering into or executing any agreement to pay any of
the  indebtedness  evidenced  hereby,  waive (to the fullest extent permitted by
law) all  requirements  of  diligence  in  collection,  presentment,  notice  of
non-payment, protest, notice of protest, suit and all other conditions precedent
or suretyship defenses in connection with the collection and enforcement of this
Note or any guaranty of the indebtedness evidenced hereby.

         The terms of this Note and the performance and observance by the Makers
of any  term of this  Note may  only be  waived  by a  written  instrument  duly
executed  by or on behalf of the  Holder.  The failure of the Holder to exercise
any of its rights,  remedies,  powers or  privileges  hereunder  in any instance
shall not constitute a waiver thereof in that or any other instance.




<PAGE>



         This Note may be assigned in whole or, with the prior  written  consent
of the Makers,  in part (provided that any such consent shall not be required if
such assignment  occurs after the Deferred Payment Date and the unpaid principal
amount assigned is at least $10,000,000.00), but any assignee shall take subject
to any and all defenses available to the Makers whether at law or in equity. The
Makers shall keep a register at their  principal place of business in the United
States and shall  provide  for the  registration  of this Note and of  transfers
hereof.  Upon surrender of this Note for  registration  of transfer,  the Makers
shall  execute and deliver in the name of the  designated  assignee or assignees
and, in the case of a partial assignment, in the name of the Holder, one or more
new  notes  containing  identical  terms and  provisions  as this Note and in an
aggregate principal amount equal to the then unpaid principal balance hereof.

         This Note is delivered in and shall be governed by and  interpreted and
determined in accordance with the laws of The Commonwealth of Massachusetts.

         THE DECLARATION OF TRUST ESTABLISHING EACH OF SENIOR HOUSING PROPERTIES
TRUST AND SPTMRT  PROPERTIES  TRUST, A COPY OF EACH 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 NAMES  "SPTMRT  PROPERTIES  TRUST" AND "SENIOR  HOUSING  PROPERTIES  TRUST,"
RESPECTIVELY,   REFER  TO  THE  TRUSTEES   UNDER  THE   RESPECTIVE   DECLARATION
COLLECTIVELY  AS  TRUSTEES,  BUT NOT  INDIVIDUALLY  OR  PERSONALLY,  AND THAT NO
TRUSTEE, OFFICER,  SHAREHOLDER,  EMPLOYEE OR AGENT OF SPTMRT PROPERTIES TRUST OR
SENIOR HOUSING PROPERTIES TRUST SHALL BE HELD TO ANY PERSONAL LIABILITY, JOINTLY
OR SEVERALLY,  FOR ANY OBLIGATION OF, OR CLAIM AGAINST,  SPTMRT PROPERTIES TRUST
OR SENIOR  HOUSING  PROPERTIES  TRUST,  RESPECTIVELY.  ALL PERSONS  DEALING WITH
SPTMRT  PROPERTIES TRUST OR SENIOR HOUSING  PROPERTIES  TRUST, IN ANY WAY, SHALL
LOOK ONLY TO THE ASSETS OF SPTMRT PROPERTIES TRUST OR SENIOR HOUSING  PROPERTIES
TRUST,  RESPECTIVELY,  FOR  THE  PAYMENT  OF ANY SUM OR THE  PERFORMANCE  OF ANY
OBLIGATION.




<PAGE>


         WITNESS the  execution  hereof under seal, as of the day and year first
above written.

                                         SPTMRT PROPERTIES TRUST



                                         By:___________________________________
                                            Title:


                                         SENIOR HOUSING PROPERTIES TRUST



                                         By:___________________________________
                                            Title:

<PAGE>
                                   Schedule I

                             Description of Premises


         PROPERTY                                       TRANSFEREE
         --------                                       ----------

6001 E. Thomas Road                               SPTMRT Properties Trust
Scottsdale, AZ

17225 N. Boswell Blvd                             SPTMRT Properties Trust
Sun City, AZ

24552 Paseo de Valencia                           SPTMRT Properties Trust
Laguna Hills, CA

1208 South Military Trail                         SPTMRT Properties Trust
Deerfield Beach, FL

45 Katherine Boulevard                            SPTMRT Properties Trust
Palm Harbor, FL

6343 Via de Sonrisa del Sur                       SPTMRT Properties Trust
Boca Raton, FL

1699 S.E. Lyngate Drive                           SPTMRT Properties Trust
Port St. Lucie, FL

2525 East First Street                            SPTMRT Properties Trust
Fort Meyers, FL

1250 West Central Road                            SPTMRT Properties Trust
Arlington Heights, IL

3701 International Drive                          SPTMRT Properties Trust
Silver Spring, MD

4620 Bellaire Boulevard                           SPTMRT Properties Trust
Bellaire, TX

5620 Wesleyan Drive                               SPTMRT Properties Trust
Virginia Beach, VA

2610 Barracks Road                                SPTMRT Properties Trust
Charlottesville, VA

900 North Taylor Road                             SPTMRT Properties Trust
Arlington, VA

265 E. 24th Street                                SPTMNR Properties Trust
Yuma, AZ

2470 S. Arizona Avenue                            SPTMNR Properties Trust
Yuma, AZ

2932 N. 14th Street                               SPTMNR Properties Trust
Phoenix, AZ



<PAGE>


         PROPERTY                                       TRANSFEREE
         --------                                       ----------

577 South Peach Street                            SPTMNR Properties Trust
Fresno, CA

5650 Reseda Boulevard                             SPTMNR Properties Trust
Tarzana, CA

93 W. Ave de Los Arboles                          SPTMNR Properties Trust
Thousand Oaks, CA

6835 Hazeltine Street                             SPTMNR Properties Trust
Van Nuys, CA

466 Flagship Road                                 SPTMNR Properties Trust
Newport Beach, CA

1642 West Avenue J                                SPTMNR Properties Trust
Lancaster, CA

537 E. Fulton                                     SPTMNR Properties Trust
Stockton, CA

1599 Ingals                                       SPTMNR Properties Trust
Lakewood, CO

5555 South Elati Street                           SPTMNR Properties Trust
Littleton, CO

250 Bishop Lane                                   SPTMNR Properties Trust
Concord, NC

4911 Brian Center Lane                            SPTMNR Properties Trust
Winston-Salem, NC

2501 Downing Street                               SPTMNR Properties Trust
Wilson, NC

1345 Michigan Avenue S.W.                         SPTMNR Properties Trust
Huron, SD

1251 Arizona S.W.                                 SPTMNR Properties Trust
Huron, SD

3600 S. Norton                                    SPTMNR Properties Trust
Sioux Falls, SD

70 Greentree Road                                 SPTMNR Properties Trust
Clintonville, WI

18741 W. Bluemound Road                           SPTMNR Properties Trust
Brookfield, WI

1471 Waukesha Avenue                              SPTMNR Properties Trust
Waukesha, WI

4325 Nakoma Road                                  SPTMNR Properties Trust
Madison, WI


                                       -2-

<PAGE>


         PROPERTY                                       TRANSFEREE
         --------                                       ----------

321 Riverside Drive                                SPTMNR Properties Trust
Pewaukee, WI

Route 4, Box 549                                   SPTMNR Properties Trust
Clintonville, WI

7800 W. Fond Du Lac Ave                            SPTMNR Properties Trust
Milwaukee, WI

1132 E. Knapp Street                               SPTMNR Properties Trust
Milwaukee, WI

2050 South Main                                    SPTIHS Properties Trust
Delta, CO

2825 Patterson Road                                SPTIHS Properties Trust
Grand Junction, CO

2501 Little Bookcliff Drive                        SPTIHS Properties Trust
Grand Junction, CO

110 West Van Buren                                 SPTIHS Properties Trust
Colorado Springs, CO

515 Fairview                                       SPTIHS Properties Trust
Canon City, CO*

1765 Temple Avenue                                 SPTIHS Properties Trust
College Park, GA

606 Simmons Street                                 SPTIHS Properties Trust
Dublin, GA

1480 Sandtown Road                                 SPTIHS Properties Trust
Marietta, GA

303 Fifth Street N.                                SPTIHS Properties Trust
Glenwood, GA

1015 West Summit                                   SPTIHS Properties Trust
Winterset, IA*

600 Manor Drive                                    SPTIHS Properties Trust
Clarinda, IA

608 Prairie Street                                 SPTIHS Properties Trust
Mediapolis, IA

34 Northcrest Drive                                SPTIHS Properties Trust
Council Bluffs, IA

RR I Hwy 385 S, PO Box 157                         SPTIHS Properties Trust
Pacific Junction, IA

510 W. 7th Street                                  SPTIHS Properties Trust
Ellinwood, KS


                                       -3-

<PAGE>



         PROPERTY                                       TRANSFEREE
         --------                                       ----------

300 Cedar Street                                  SPTIHS Properties Trust
Tarkio, MO

800 Stoeger Drive                                 SPTIHS Properties Trust
Grand Island, NE

503 South 18th Street                             SPTIHS Properties Trust
Laramie, WY

1901 Howell                                       SPTIHS Properties Trust
Worland, WY*

6220 East Broadway Road                           SPTBROOK Properties Trust
Mesa, AZ

2960 North Lake Shore Drive                       SPTBROOK Properties Trust
Chicago, IL

2001 Clinton Ave South                            SPTBROOK Properties Trust
Rochester, NY

601 S. Park Road                                  SPTBROOK Properties Trust
511 S. Park Road
Spokane, WA

171 Rope Ferry Road                               SPTSUN Properties Trust
Waterford, CT

65 Westcott Road                                  SPTSUN Properties Trust
Killingly, CT

595 Valley Street                                 SPTSUN Properties Trust
Willimantic, CT

2305 Rancocas Road                                SPTGEN Properties Trust
Burlington, NJ

3929 Hoover Road                                  SPTMISC Properties Trust
Grove City, OH

1317 North 36th Street                            SPTMISC Properties Trust
St. Joseph, MO

555 16th Avenue                                   SPTSUN II Properties Trust
Seattle, WA

99 Chestnut Hill Ave.                             HRES1 Properties Trust
Brighton, MA

59 Acton Street                                   HRES1 Properties Trust
Worcester, MA

23 Isaac Street                                   HRES1 Properties Trust
Middleboro, MA

89 Lewis Bay Road                                 HRES1 Properties Trust
Hyannis, MA


                                       -4-

<PAGE>



         PROPERTY                                       TRANSFEREE
         --------                                       ----------

200 Hill Church-Houston Rd.                       HRES1 Properties Trust
Route 519 South
Cannonsburg, PA

181 Clifton Street                                HRES2 Properties Trust
New Haven, CT

177 Whitewood Rd.                                 HRES2 Properties Trust
Waterbury, CT

50 Hazel Drive                                    HRES2 Properties Trust
Cheshire, CT


*Two properties are located at each of these locations.



                                       -5-
<PAGE>
<TABLE>
<CAPTION>

                                   Schedule II

                     Description of Tenant Leases/Mortgages1


                                LEASED PROPERTIES

Property                               Lease Description
- -----------------------------------------------------------------------------------------------------------------------
<S>                                   <C>

Bedford Court                          Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Silver Spring, MD                      Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust, as Landlord, and Marriott Continuing Care, Inc.
                                       (as successor in interest to Marriott Senior Living Services, Inc.), as Tenant,
                                       as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Brighton - Gardens - Bellaire          Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Bellaire, TX  (Houston)                Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Stratford Court of Boca Raton          Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
(aka Boca Pointe)                      Properties Trust (as successor in interest to HMH Properties, Inc., and
Boca Raton, FL                         HRPT Properties Trust), as Landlord, and Marriott Senior Living Services,
                                       Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Calusa Harbour                         Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Ft. Myers, FL                          Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Continuing Care,
                                       Inc. (as successor in interest to Marriott Senior Living Services, Inc.), as
                                       Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Church Creek                           Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Arlington Heights, IL                  Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Continuing Care,
                                       Inc. (as successor in interest to Marriott Senior Living Services, Inc.), as
                                       Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Horizon Club                           Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Deerfield Beach, FL                    Properties Trust (as successor in interest to HMH Properties, Inc. and HRPT
                                       Properties Trust), as Landlord, and Marriott Senior Living Services, Inc, as
                                       Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
The Jefferson                          Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Arlington, VA                          Properties Trust (as successor in interest to HMC Retirement Properties,
                                       Inc., and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
The Colonnades                         Facilities Sublease Agreement, dated October 8, 1993, between SPTMRT
Charlottesville, VA                    Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Sublandlord, and Marriott Continuing Care,
                                       Inc. (as successor in interest to Marriott Senior Living Services, Inc.), as
                                       Tenant, as amended to date

<PAGE>
- -----------------------------------------------------------------------------------------------------------------------
Stratford Court of Palm Harbor         Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Palm Harbor, FL                        Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Brighton Gardens - Port St. Lucie      Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Port St. Lucie, FL                     Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Brighton Gardens - Scottsdale          Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Scottsdale, AZ                         Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Brighton Gardens - Sun City            Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Sun City, AZ                           Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Villa Valencia                         Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Laguna Hills, CA                       Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
                                       and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Brighton Gardens - Virginia            Facilities Lease Agreement, dated October 8, 1993, between SPTMRT
Beach                                  Properties Trust (as successor in interest to HMC Retirement Properties, Inc.
Virginia Beach, VA                     and HRPT Properties Trust), as Landlord, and Marriott Senior Living
                                       Services, Inc., as Tenant, as amended to date

                                       2
<PAGE>

- -----------------------------------------------------------------------------------------------------------------------
Flagship Health Care Center,           Master Lease Agreement, dated December 28, 1990, between SPTMNR
Newport Beach, CA                      Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and AMS Properties, Inc., as Tenant, as amended to date.  Facility
Lancaster Convalescent Hospital        Leases, between SPTMNR Properties Trust (as successor in interest to
Lancaster, Lancaster, CA               HRPT Properties Trust), as Landlord, and AMS Properties, Inc., as amended
                                       to date, have been entered into under the Master Lease Agreement for the
Pacific Gardens Health Care            following properties:
Fresno, CA
(aka Pleasant Gardens)                 Flagship Health Care Center,
                                       Newport Beach, CA
Tarzana Health and Rehab.
Tarzana, CA                            Lancaster Convalescent Hospital
                                       Lancaster, Lancaster, CA
Thousand Oaks Convalarium
Thousand Oaks, CA                      Pacific Gardens Health Care Fresno, CA
                                       (aka Pleasant Gardens)
Van Nuys Convalarium
Van Nuys, CA                           Tarzana Health and Rehab.
                                       Tarzana, CA
Cedars Health Care Center
Lakewood, CO                           Thousand Oaks Convalarium
                                       Thousand Oaks, CA
Cherrlyn Manor Nursing Home
Littleton, CO                          Van Nuys Convalarium
                                       Van Nuys, CA
Greentree Health Care
Clintonville, WI                       Cedars Health Care Center
                                       Lakewood, CO
Pine Manor Health Care Center
Clintonville, WI                       Cherrlyn Manor Nursing Home
                                       Littleton, CO
Sunny Hills Health Care Center
Madison, WI                            Greentree Health Care
                                       Clintonville, WI
Virginia Health Care Center
Waukesha, WI                           Pine Manor Health Care Center
(aka Waukesha)                         Clintonville, WI

Woodland Health Care Center            Sunny Hills Health Care Center
Brookfield, WI                         Madison, WI

Christopher East                       Virginia Health Care Center
Milwaukee, WI                          Waukesha, WI
                                       (aka Waukesha)

                                       Woodland Health Care Center
                                       Brookfield, WI

                                       Christopher East
                                       Milwaukee, WI

                                       3
<PAGE>
- -----------------------------------------------------------------------------------------------------------------------
                                       Master Lease Document, dated June 30, 1992, between SPTMNR Properties
Village Green Nursing Home,            Trust (as successor in interest to HRPT Properties Trust), as Landlord, and
Phoenix, AZ                            GCI Health Care Centers, Inc., as Tenant, as amended to date.  Facility
                                       Leases, between SPTMNR Properties Trust (as successor in interest to
La Mesa Care Center                    HRPT Properties Trust), as Landlord, and AMS Properties, Inc., as amended
Yuma, AZ                               to date, have been entered into under the Master Lease Agreement for the
                                       following properties:
Sunquest Village of Yuma/
Yuma Village                           Village Green Nursing Home,
Yuma, AZ                               Phoenix, AZ

La Sallette Health and                 La Mesa Care Center
Rehabilitation Center                  Yuma, AZ
 Stockton, CA
                                       Sunquest Village of Yuma/Yuma Village
Huron Nursing Home                     Yuma, AZ
Huron, SD
                                       La Sallette Health and Rehabilitation Center
Sunquest Village of Huron,              Stockton, CA
Huron, SD
                                       Huron Nursing Home
Mom & Dads Home and                   Huron, SD
Healthcare Center
Sioux Falls, SD                        Sunquest Village of Huron,
(aka Southridge Health)                Huron, SD

                                       Mom & Dads Home and Healthcare Center
                                       Sioux Falls, SD
                                       (aka Southridge Health)
- -----------------------------------------------------------------------------------------------------------------------
Brian Care Company/BCC                 Lease, dated as of June 29, 1998, between SPTMNR Properties Trust (as
Wilson                                 successor in interest to HRPT Properties Trust), as Landlord, and AMS
Wilson, NC                             Properties, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Brian Care Co., Concord/BCC            Lease, dated as of June 29, 1998, between SPTMNR Properties Trust (as
Concord                                successor in interest to HRPT Properties Trust), as Landlord, and AMS
Concord, NC                            Properties, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
River Hills West Health Center         Lease, dated as of June 29, 1998, between SPTMNR Properties Trust (as
Pewaukee, WI                           successor in interest to HRPT Properties Trust), as Landlord, and AMS
                                       Properties, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Brian Care Co. Winston/BCC             Lease, dated as of June 29, 1998, between SPTMNR Properties Trust (as
Winston-Salem, NC                      successor in interest to HRPT Properties Trust), as Landlord, and AMS
                                       Properties, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Northwest Rehabilitation Center        Lease, dated as of June 29, 1998, between SPTMNR Properties Trust (as
Milwaukee, WI                          successor in interest to HRPT Properties Trust), as Landlord, and AMS
                                       Properties, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Canon City             Lease between SPTIHS Properties Trust (as successor in interest to HRPT
Canon City, CO(2)                      Properties Trust), as Landlord, and ECA Holdings, Inc., as Tenant, dated
                                       September 24, 1997, as amended to date


                                       4

<PAGE>
- -----------------------------------------------------------------------------------------------------------------------
Spring Village Care Center             Lease between SPTIHS Properties Trust (as successor in interest to HRPT
Colorado Springs, CO                   Properties Trust), and ECA Holdings, Inc., as Tenant, dated September 24,
                                       1997, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Delta                  Lease between SPTIHS Properties Trust (as successor in interest to HRPT
Delta, CO                              Properties Trust), as Landlord, and ECA Holdings, Inc., as Tenant, dated
                                       September 24, 1997, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Grand Junction         Lease between SPTIHS Properties Trust (as successor in interest to HRPT
Grand Junction, CO                     Properties Trust), as Landlord, and ECA Holdings, Inc., as Tenant, dated as
                                       of December 30, 1993, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
LaVilla Grande                         Lease between SPTIHS Properties Trust (as successor in interest to HRPT
Grand Junction, CO                     Properties Trust), as Landlord, and ECA Holdings, Inc., as Tenant, dated as
                                       of December 30, 1993, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Laurens Convalescent Center            Master Lease Document, General Terms and Conditions, dated May 10,
Dublin, GA                             1996, for leases executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and Marietta/SCC, Inc.,
                                       Glenwood/SCC, Inc., Dublin/SCC, Inc. and College Park/SCC, Inc., as
                                       Tenants, as amended to date.  Facility Lease Short Form, dated May 10,
                                       1996, between SPTIHS Properties Trust (as successor in interest to HRPT
                                       Properties Trust), as Landlord, and Dublin/SCC, Inc., as Tenant, as amended
                                       to date.
- -----------------------------------------------------------------------------------------------------------------------
Park Haven Health Center               Master Lease Document, General Terms and Conditions, dated May 10,
College Park, GA                       1996, for leases executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and Marietta/SCC, Inc.,
                                       Glenwood/SCC, Inc., Dublin/SCC, Inc. and College Park/SCC, Inc., as
                                       Tenants, as amended to date.  Facility Lease Short Form, dated May 10,
                                       1996, between SPTIHS Properties Trust (as successor in interest to HRPT
                                       Properties Trust), as Landlord, and College Park/SCC, Inc., as Tenant, as
                                       amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Autumn Breeze Nursing Home             Master Lease Document, General Terms and Conditions, dated May 10,
Marietta, GA                           1996, for leases executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and Marietta/SCC, Inc.,
                                       Glenwood/SCC, Inc., Dublin/SCC, Inc. and College Park/SCC, Inc., as
                                       Tenants, as amended to date.  Facility Lease Short Form, dated May 10,
                                       1996, between SPTIHS Properties Trust (as successor in interest to HRPT
                                       Properties Trust), as Landlord, and Marietta/SCC, Inc., as Tenant, as
                                       amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Connor Nursing Home                    Master Lease Document, General Terms and Conditions, dated May 10,
Glenwood, GA                           1996, for leases executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and Marietta/SCC, Inc.,
                                       Glenwood/SCC, Inc., Dublin/SCC, Inc. and College Park/SCC, Inc., as
                                       Tenants, as amended to date.  Facility Lease Short Form, dated May 10,
                                       1996, between SPTIHS Properties Trust (as successor in interest to HRPT
                                       Properties Trust), as Landlord, and Marietta/SCC, Inc., as Tenant, as
                                       amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Clarinda               Lease, dated as of December 30, 1993, between SPTIHS Properties Trust
Clarinda, IA                           (as successor in interest to HRPT Properties Trust), as Landlord, and ECA
                                       Holdings, Inc., as Tenant, as amended to date

                                       5
<PAGE>
- -----------------------------------------------------------------------------------------------------------------------
Gentry Care South, Iowa                Master Lease Document, General Terms and Conditions, dated as of April 1,
Council Bluffs, IA                     1995, for leases to be executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and ECA Holdings, Inc., as
                                       Tenant, as amended to date.  Lease, dated April 1, 1995, between SPTIHS
                                       Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and ECA Holdings, Inc., as Tenant, as amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Woodhaven Care Center                  Master Lease Document, General Terms and Conditions, dated as of April 1,
Ellinwood, KS                          1995, for leases to be executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and ECA Holdings, Inc., as
                                       Tenant, as amended to date.  Lease, dated April 1, 1995, between SPTIHS
                                       Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and ECA Holdings, Inc., as Tenant, as amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Mediapolis             Lease dated as of December 30, 1993, between SPTIHS Properties Trust (as
Mediapolis, IA                         successor in interest to HRPT Properties Trust), as Landlord, and ECA
                                       Holdings, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Winterset              Lease dated December 30, 1993 SPTIHS Properties Trust (as successor in
Winterset, IA (2)                      interest to HRPT Properties Trust), as Landlord, and ECA Holdings, Inc., as
                                       Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Pacific Place, Iowa                    Master Lease Document, General Terms and Conditions, dated as of April 1,
Pacific Junction, IA                   1995, for leases to be executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and ECA Holdings, Inc., as
                                       Tenant, as amended to date.  Lease, dated April 1, 1995, between SPTIHS
                                       Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and ECA Holdings, Inc., as Tenant, as amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Tarkio                 Lease, dated as of December 30, 1993, between SPTIHS Properties Trust
Tarkio, MO                             (as successor in interest to HRPT Properties Trust), as Landlord, and ECA
                                       Holdings, Inc., as Tenant, as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Wedgewood Manor                        Master Lease Document, General Terms and Conditions, dated as of April 1,
Grand Island, NE                       1995, for leases to be executed by SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and ECA Holdings, Inc., as
                                       Tenant, as amended to date.  Lease, dated April 1, 1995, between SPTIHS
                                       Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and ECA Holdings, Inc., as Tenant, as amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Laramie                Lease, dated as of December 30, 1993, between SPTIHS Properties Trust
Laramie, WY                            (as successor in interest to HRPT Properties Trust), as Landlord, and ECA
                                       Holdings, Inc., as Tenant, as amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care @ Worland                Lease, dated as of December 30, 1993, between SPTIHS Properties Trust
Worland, WY (2)                        (as successor in interest to HRPT Properties Trust), as Landlord, and ECA
                                       Holdings, Inc., as Tenant, as amended to date

                                       6
<PAGE>
- -----------------------------------------------------------------------------------------------------------------------
Springs of East Mesa                   Master Lease Agreement, dated as of December 27, 1996, between
E. Mesa, AZ                            SPTBROOK Properties Trust (as successor in interest to HRPT Properties
                                       Trust), as Landlord, and BLC Property, Inc., as Tenant, as amended to date
The Hallmark
Chicago, IL

The Gables at Brighton
Rochester, NY

Park Place
Spokane, WA
- -----------------------------------------------------------------------------------------------------------------------
Westcott Care Center                   Lease Agreement, dated as of November 1, 1993, between SPTSUN
Killingly, CT                          Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and Sunrise Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Waterford Health & Rehab.              Lease Agreement, dated as of November 1, 1993, between SPTSUN
Waterford, CT                          Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and Sunrise Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Windham Hills Care Center              Lease Agreement, dated as of November 1, 1993, between SPTSUN
Willimantic, CT                        Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and Sunrise Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Phoenix Rehabilitation - Seattle       Lease Agreement, dated as of November 1, 1993, between SPTSUN II
Seattle, WA                            Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and Sunrise Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Marcella Associates                    Master Lease Document, General Terms and Conditions, dated as of
Burlington, NJ                         September 28, 1995, for Lease executed by SPTGEN Properties Trust (as
                                       successor in interest to HRPT Properties Trust), as Landlord, and Health
                                       Resources of Marcella, Inc., as Tenant, as amended to date.  Lease, dated
                                       September 28, 1995, between SPTGEN Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as Landlord, and Health Resources of
                                       Marcella, Inc., as Tenant, as amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Monterey Nursing Inn                   Lease and Security Agreement Option between Ahtrum, Inc. and SCIT, Inc.,
Grove City, OH                         dated December 1, 1990, assigned to SPTMISC Properties Trust (as
                                       successor in interest to HRPT Properties Trust) pursuant to Assignment and
                                       Assumption of Leases, Contracts and Agreements, dated June 4, 1993
- -----------------------------------------------------------------------------------------------------------------------
Beverly Manor                          Lease and Security Agreement between Safe Care, as Landlord, and David
St. Joseph, MO                         Cathcart and Beverly J. Cathcart, as Tenant, dated March 10, 1975, as
                                       assigned by Assignment and Assumption of Leases, Contracts and
                                       Agreements between Safecare Company, Inc., as Assignor, and SPTMISC
                                       Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Assignee, dated June 4, 1993, all as amended to date.


                                      7
<PAGE>
- -----------------------------------------------------------------------------------------------------------------------
Greenery Rehab. & Skilled              Lease Agreement, dated as of November 29, 1993, between HRES1
Nursing Center - Brighton              Properties Trust (as successor in interest to HRPT Properties Trust), as
Boston, MA                             Landlord, and Horizon Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Greenery Rehab. & Skilled              Lease Agreement, dated as of November 29, 1993, between HRES1
Nursing Center - Middleboro            Properties Trust (as successor in interest to HRPT Properties Trust), as
Middleboro, MA                         Landlord, and Horizon Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Greenery Rehab. & Skilled              Lease Agreement, dated as of November 29, 1993, between HRES1
Nursing Center - Hyannis               Properties Trust (as successor in interest to HRPT Properties Trust), as
Hyannis, MA                            Landlord, and Horizon Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Greenery Extended Care Center          Lease Agreement, dated as of February 11, 1994, between HRES1
Worcester, MA                          Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and Horizon Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Greenery Rehab. & Skilled              Lease Agreement, dated as of February 11, 1994, between HRES1
Nursing Center - Canonsburgh           Properties Trust (as successor in interest to HRPT Properties Trust), as
Canonsburgh, PA                        Landlord, and Horizon Healthcare Corporation, as Tenant, as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Fairview Extended Care Center          Lease Agreement, dated as of February 11, 1994, between HRESII
New Haven, CT                          Properties Trust (as successor in interest to HRPT Properties Trust), as
                                       Landlord, and Connecticut Subacute Corporation II (CSCII), as Tenant, as
                                       amended to date
- -----------------------------------------------------------------------------------------------------------------------
Greenery Rehab. Center -               Lease Agreement, dated as of February 11, 1994, between HRESII
Waterbury                              Properties Trust (as successor in interest to HRPT Properties Trust), as
Waterbury, CT                          Landlord, and Connecticut Subacute Corporation II (CSCII), as Tenant, as
                                       amended to date
- -----------------------------------------------------------------------------------------------------------------------
New Lakeview Convalescent              Lease Agreement, dated as of February 11, 1994, between HRESII
Home                                   Properties Trust (as successor in interest to HRPT Properties Trust), as
Cheshire, CT                           Landlord, and Connecticut Subacute Corporation II (CSCII) as Tenant, as
                                       amended to date
- -----------------------------------------------------------------------------------------------------------------------


                                               MORTGAGED PROPERTIES

- -----------------------------------------------------------------------------------------------------------------------
Property                               Mortgage Description
- -----------------------------------------------------------------------------------------------------------------------
New Medico                             Mortgage and Security Agreement, dated January 28, 1995,  by Horizon
Slidell, LA                            Healthcare Corporation to HRES1 Properties Trust (as successor in interest
                                       to HRPT Properties Trust), as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Greenery Extended Care Center          Mortgage and Security Agreement, dated November 29, 1993, by Horizon
Farmington, MI                         Healthcare Corporation, to HRES1 Properties Trust (as successor in interest
                                       to HRPT Properties Trust), as amended to date


                                       8
<PAGE>
- -----------------------------------------------------------------------------------------------------------------------
Howell Health Care                     Mortgage and Security Agreement, dated November 29, 1993, by Horizon
Howell, MI                             Healthcare Corporation, to HRES1 Properties Trust (as successor in interest
                                       to HRPT Properties Trust), as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Logan Valley Manor                     Deed of Trust and Construction Security Agreement, dated as of April 1,
Lyons, NE                              1995, by Quality Care of Lyons, Inc. to SPTIHS Properties Trust (as
                                       successor in interest to HRPT Properties Trust), as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Crestview Care Center                  Deed of Trust and Construction Security Agreement, dated as of April 1,
Milford, NE                            1995, by W.S.T. Care, Inc. to SPTIHS Properties Trust (as successor in
                                       interest to HRPT Properties Trust), as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Waverly Center                         Deed of Trust and Construction Security Agreement, dated as of December
Waverly, NE                            30, 1993, from Community Care of Nebraska, Inc. to SPTIHS Properties
                                       Trust (as successor in interest to HRPT Properties Trust), as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care at Ainsworth             Deed of Trust and Construction Security Agreement, dated as of December
Ainsworth, NE                          30, 1993, from Community Care of Nebraska, Inc. to SPTIHS Properties
                                       Trust (as successor in interest to HRPT Properties Trust), as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care at Ashland               Deed of Trust and Construction Security Agreement, dated as of December
Ashland, NE                            30, 1993, from Community Care of Nebraska, Inc. to SPTIHS Properties
                                       Trust (as successor in interest to HRPT Properties Trust), as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care at Blue Hill             Deed of Trust and Construction Security Agreement, dated as of December
Blue Hill, NE                          30, 1993, from Community Care of Nebraska, Inc. to SPTIHS Properties
                                       Trust (as successor in interest to HRPT Properties Trust), as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care at Gretna                Deed of Trust and Construction Security Agreement, dated as of December
Gretna, NE                             30, 1993, from Community Care of Nebraska, Inc. to SPTIHS Properties
                                       Trust (as successor in interest to HRPT Properties Trust), as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care at Sutherland            Deed of Trust, Leasehold Deed of Trust and Construction Security
Sutherland, NE                         Agreement, dated as of December 30, 1993, from Community Care of
                                       Nebraska, Inc. to SPTIHS Properties Trust (as successor in interest to HRPT
                                       Properties Trust), as amended to date
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care at Edgar                 Negative Pledge Agreement, dated as of December 30, 1993, by Community
Edgar, NE                              Care of Nebraska, Inc. to SPTIHS Properties Trust (as successor in interest
                                       to HRPT Properties Trust), as amended to date
- -----------------------------------------------------------------------------------------------------------------------
                                       9
<PAGE>
                                                LEASEHOLD INTERESTS

- -----------------------------------------------------------------------------------------------------------------------
Property                               Leasehold Interest
- -----------------------------------------------------------------------------------------------------------------------
The Colonnades                         Retirement Community Development and Lease Agreement, dated April 1, 1989,
Charlottesville, VA                    between UREF Retirement Corporation, as Lessor, and SPTMRT Properties Trust
                                       (as successor in interest to HRPT Properties Trust, as successor to Marriott
                                       Corporation), as amended to date.
- -----------------------------------------------------------------------------------------------------------------------
Bethesda Care at Laramie               Lease Agreement, dated July 6, 1964, between County of Albany, State of
Laramie, WY                            Wyoming, as Owner, and SPTIHS Properties Trust (as successor in interest
                                       to HRPT Properties Trust, as successor to Our Home, Inc.), as amended to
                                       date
- -----------------------------------------------------------------------------------------------------------------------
<FN>

1    HRPT Properties Trust was known as Health and Rehabilitation Properties Trust until June 30, 1994, and was
     known as Health and Retirement Properties Trust from July 1, 1994 through June 30, 1998.

2    Two properties are located at each of these locations.
</FN>
</TABLE>
<PAGE>
                                  Schedule III

                     Description of Transferred Subsidiaries

HRES1 Properties Trust
HRES2 Properties Trust
SPTBROOK  Properties Trust
SPTGEN  Properties Trust
SPTIHS Properties Trust
SPTMISC  Properties Trust
SPTMNR  Properties Trust
SPTMRT  Properties Trust
SPTSUN Properties Trust
SPTSUN II Properties Trust



<PAGE>




THIS NOTE WAS ORIGINALLY ISSUED IN A TRANSACTION  EXEMPT FROM REGISTRATION UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"). THIS NOTE HAS NOT
BEEN REGISTERED  UNDER THE SECURITIES ACT OR ANY APPLICABLE STATE SECURITIES LAW
OF ANY STATE AND MAY NOT BE  OFFERED,  SOLD,  PLEDGED OR  OTHERWISE  TRANSFERRED
UNLESS REGISTERED  PURSUANT TO OR EXEMPT FROM REGISTRATION  UNDER THE SECURITIES
ACT AND ANY OTHER APPLICABLE SECURITIES LAW.


                                 PROMISSORY NOTE


$200,000,000.00                                                September 1, 1999
                                                           Newton, Massachusetts

         FOR VALUE  RECEIVED,  SPTMRT  PROPERTIES  TRUST  ("SPTMRT")  and SENIOR
HOUSING  PROPERTIES  TRUST  ("Senior  Housing"),  each a  Maryland  real  estate
investment trust (each a "Maker" and together, the "Makers"), by this promissory
note (this "Note"),  promise unconditionally and jointly and severally to pay to
HRPT  PROPERTIES  TRUST,  a Maryland real estate  investment  trust  ("HRPT") or
registered  assigns (the  "Holder")  the  principal  sum of TWO HUNDRED  MILLION
DOLLARS  ($200,000,000.00),  on the Deferred  Payment  Date (as defined  below),
together with any accrued but unpaid interest on the principal  amount from time
to time outstanding hereunder as set forth below.

         This Note shall bear interest on the principal amount from time to time
outstanding  hereunder  from the date hereof to and  including the date on which
the principal  amount  outstanding  hereunder is repaid in full,  payable on the
Deferred  Payment  Due Date  and  thereafter  on  demand,  at a rate  per  annum
determined for each day equal to HRPT's weighted average effective interest rate
on its  indebtedness  for money  borrowed on such day (as  determined by HRPT in
good faith), but in no event exceeding the maximum rate permitted by law.

         The Makers may prepay  principal  of this Note in part or in whole from
time to time without  premium or penalty,  but together  with accrued and unpaid
interest on the principal amount prepaid.

         As used herein,  the term "Deferred  Payment Date" means the earlier to
occur  of  (i)  the  10th  day  following  the  date  of the  distribution  (the
"Distribution")  of a number of common shares of beneficial  interest,  $.01 par
value of Senior Housing (the "Senior  Housing Common Shares") by HRPT to holders
of  common  shares of  beneficial  interest,  $.01 par value of HRPT (the  "HRPT
Common  Shares") equal to one tenth (1/10th) of the number of HRPT Common Shares
which are issued and  outstanding on the record date for the  Distribution,  and
(ii) December 31, 1999.



<PAGE>



         All payments of principal,  interest and other amounts payable on or in
respect of this Note or the  indebtedness  evidenced hereby shall be made to the
Holder at such places  within the United  States of America as the Holder  shall
from time to time  designate  in lawful  money of the United  States of America.
Payments hereunder shall be made in immediately available funds.

         Without limitation of any other right or remedy of the Holder hereunder
or under the Transaction  Agreement,  if the Makers or any of them shall fail to
pay the entire principal amount of this Note on or prior to the Deferred Payment
Date, then without  further demand from the Holder,  SPTMRT shall within 10 days
following  the  Deferred  Payment  Date (and in any case by December  31,  1999)
secure its obligations under this Note with a perfected,  first mortgage lien on
the land, improvement and fixtures owned by SPTMRT (including those described on
Schedule I hereto) together with any personal  property owned by SPTMRT and used
in connection  therewith (the "Premises") and perfected first assignments of and
security  interests  in  all  of the  tenant  leases  and  contracts  of  SPTMRT
identified  in  Schedule  II  hereto  and all of the  other  personal  property,
fixtures and other assets and rights  related to the  ownership,  operation  and
leasing of the Premises,  pursuant to such  mortgages,  assignments,  securities
agreements,   financing  statements  and  other  security  documents  which  may
reasonably be requested by the Holder from time to time.

         If any of the  Makers  shall  (i)  dissolve  or take any  action of its
shareholders  or board of trustees to dissolve,  (ii) commence or consent to any
case or  proceeding  under  any  federal  or  state  bankruptcy,  insolvency  or
reorganization  law or any  proceeding for  appointment of a trustee,  receiver,
custodian or similar  official  with respect to such Maker,  (iii) be subject to
any case or  proceeding  under any federal or state  bankruptcy,  insolvency  or
reorganization  law,  or  proceeding  for  appointment  of a trustee,  receiver,
custodian or similar official with respect to such Maker,  that continues for at
least sixty (60) days, (iv) make an assignment for the benefit of creditors,  or
(v) admit in writing its  inability  to pay,  or fail to pay,  its debts as they
mature, the entire unpaid principal of, and accrued and unpaid interest on, this
Note shall  automatically,  without any  requirement  of notice or action by the
Holder, become immediately due and payable.

         The  Makers  jointly  and  severally  will pay on  demand  all costs of
collection,  including all court costs and  reasonable  attorney's  fees paid or
incurred by the Holder in enforcing this Note upon default.

         All Makers, sureties,  guarantors and endorsers hereof, by executing or
endorsing this Note or by entering into or executing any agreement to pay any of
the  indebtedness  evidenced  hereby,  waive (to the fullest extent permitted by
law) all  requirements  of  diligence  in  collection,  presentment,  notice  of
non-payment, protest, notice of protest, suit and all other conditions precedent
or suretyship defenses in connection with the collection and enforcement of this
Note or any guaranty of the indebtedness evidenced hereby.

         The terms of this Note and the performance and observance by the Makers
of any  term of this  Note may  only be  waived  by a  written  instrument  duly
executed  by or on behalf of the  Holder.  The failure of the Holder to exercise
any of its rights,  remedies,  powers or  privileges  hereunder  in any instance
shall not constitute a waiver thereof in that or any other instance.

         This Note may be assigned in whole or, with the prior  written  consent
of the Makers,  in part (provided that any such consent shall not be required if
such assignment occurs after the Deferred


<PAGE>



Payment   Date  and  the  unpaid   principal   amount   assigned   is  at  least
$10,000,000.00),  but any  assignee  shall take  subject to any and all defenses
available  to the Makers  whether at law or in equity.  The Makers  shall keep a
register at their  principal  place of  business in the United  States and shall
provide  for the  registration  of  this  Note  and of  transfers  hereof.  Upon
surrender of this Note for  registration  of transfer,  the Makers shall execute
and deliver in the name of the designated assignee or assignees and, in the case
of a  partial  assignment,  in the name of the  Holder,  one or more  new  notes
containing  identical  terms and  provisions  as this  Note and in an  aggregate
principal amount equal to the then unpaid principal balance hereof.

         This Note is delivered in and shall be governed by and  interpreted and
determined in accordance with the laws of The Commonwealth of Massachusetts.

         THE DECLARATION OF TRUST ESTABLISHING EACH OF SENIOR HOUSING PROPERTIES
TRUST AND SPTMRT  PROPERTIES  TRUST, A COPY OF EACH 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 NAMES  "SPTMRT  PROPERTIES  TRUST" AND "SENIOR  HOUSING  PROPERTIES  TRUST,"
RESPECTIVELY,   REFER  TO  THE  TRUSTEES   UNDER  THE   RESPECTIVE   DECLARATION
COLLECTIVELY  AS  TRUSTEES,  BUT NOT  INDIVIDUALLY  OR  PERSONALLY,  AND THAT NO
TRUSTEE, OFFICER,  SHAREHOLDER,  EMPLOYEE OR AGENT OF SPTMRT PROPERTIES TRUST OR
SENIOR HOUSING PROPERTIES TRUST SHALL BE HELD TO ANY PERSONAL LIABILITY, JOINTLY
OR SEVERALLY,  FOR ANY OBLIGATION OF, OR CLAIM AGAINST,  SPTMRT PROPERTIES TRUST
OR SENIOR  HOUSING  PROPERTIES  TRUST,  RESPECTIVELY.  ALL PERSONS  DEALING WITH
SPTMRT  PROPERTIES TRUST OR SENIOR HOUSING  PROPERTIES  TRUST, IN ANY WAY, SHALL
LOOK ONLY TO THE ASSETS OF SPTMRT PROPERTIES TRUST OR SENIOR HOUSING  PROPERTIES
TRUST,  RESPECTIVELY,  FOR  THE  PAYMENT  OF ANY SUM OR THE  PERFORMANCE  OF ANY
OBLIGATION.



<PAGE>



         WITNESS the  execution  hereof under seal, as of the day and year first
above written.

                               SPTMRT PROPERTIES TRUST



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


                               SENIOR HOUSING PROPERTIES TRUST



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

<PAGE>
                          Schedule I to Promissory Note

         Land, improvement and fixtures owned by SPTMRT Properties Trust


                                    PROPERTY

                               6001 E. Thomas Road
                                 Scottsdale, AZ

                              17225 N. Boswell Blvd
                                  Sun City, AZ

                             24552 Paseo de Valencia
                                Laguna Hills, CA

                            1208 South Military Trail
                               Deerfield Beach, FL

                             45 Katherine Boulevard
                                 Palm Harbor, FL

                           6343 Via de Sonrisa del Sur
                                 Boca Raton, FL

                             1699 S.E. Lyngate Drive
                               Port St. Lucie, FL

                             2525 East First Street
                                 Fort Meyers, FL

                             1250 West Central Road
                              Arlington Heights, IL

                            3701 International Drive
                                Silver Spring, MD

                             4620 Bellaire Boulevard
                                  Bellaire, TX

                               5620 Wesleyan Drive
                               Virginia Beach, VA

                              900 North Taylor Road
                                  Arlington, VA

                               2610 Barracks Road
                               Charlottesville, VA



<PAGE>
<TABLE>
<CAPTION>
                                           Schedule II to Promissory Note

                                      Tenant Leases of SPTMRT Properties Trust

            PROPERTY                                         LEASE1
            --------                                         ------

<S>                                <C>

6001 E. Thomas Road                 Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Scottsdale, AZ                      Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

17225 N. Boswell Boulevard          Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Sun City, AZ                        Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

24552 Paseo de Valencia             Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Laguna Hills, CA                    Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

6343 Via de Sonrisa del Sur         Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Boca Raton, FL                      Trust (as successor in interest to HMH Properties, Inc., and HRPT Properties
                                    Trust), as Landlord, and Marriott Senior Living Services, Inc., as Tenant, as
                                    amended to date

2525 East First Street              Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Ft. Myers, FL                       Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Continuing Care, Inc. (as successor in
                                    interest to Marriott Senior Living Services, Inc.), as Tenant, as amended to date

1208 South Military Trail           Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Deerfield Beach, FL                 Trust (as successor in interest to HMH Properties, Inc. and HRPT Properties
                                    Trust), as Landlord, and Marriott Senior Living Services, Inc, as Tenant, as
                                    amended to date

45 Katherine Boulevard              Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Palm Harbor, FL                     Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

1699 S.E. Lyngate Drive             Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Port St. Lucie, FL                  Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

1250 West Central Road              Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Arlington Heights, IL               Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Continuing Care, Inc. (as successor in
                                    interest to Marriott Senior Living Services, Inc.), as Tenant, as amended to date

3701 International Drive            Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Silver Spring, MD                   Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust, as Landlord, and Marriott Continuing Care, Inc. (as successor in
                                    interest to Marriott Senior Living Services, Inc.), as Tenant, as amended to date

<PAGE>

            PROPERTY                                         LEASE1
            --------                                         ------


Bellaire, TX                        Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

2610 Barracks Road                  Facilities Sublease Agreement, dated October 8, 1993, between SPTMRT
Charlottesville, VA                 Properties Trust (as successor in interest to HMC Retirement Properties, Inc. and
                                    HRPT Properties Trust), as Sublandlord, and Marriott Continuing Care, Inc. (as
                                    successor in interest to Marriott Senior Living Services, Inc.), as Tenant, as
                                    amended to date

900 North Taylor Road               Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Arlington, VA                       Trust (as successor in interest to HMC Retirement Properties, Inc., and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

5620 Wesleyan Drive                 Facilities Lease Agreement, dated October 8, 1993, between SPTMRT Properties
Virginia Beach, VA                  Trust (as successor in interest to HMC Retirement Properties, Inc. and HRPT
                                    Properties Trust), as Landlord, and Marriott Senior Living Services, Inc., as
                                    Tenant, as amended to date

<FN>
1    HRPT  Properties  Trust was known as Health and  Rehabilitation  Properties
     Trust  until  June  30,  1994,  and was  known  as  Health  and  Retirement
     Properties Trust from July 1, 1994 through June 30, 1998.
</FN>
</TABLE>


                                                        -2-




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