HRPT PROPERTIES TRUST
SC 13D, 1999-09-29
REAL ESTATE INVESTMENT TRUSTS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
             TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT
                                TO RULE 13d-2(a)
                              (Amendment _______)*

                         SENIOR HOUSING PROPERTIES TRUST
                                (Name of Issuer)

              COMMON SHARES OF BENEFICIAL INTEREST, $0.01 PAR VALUE
                         (Title of Class of Securities)

                                   81721M 10 9
                                 (CUSIP Number)

                                David J. Hegarty
                              HRPT Properties Trust
                                400 Centre Street
                                Newton, MA 02458
                                 (617) 332-3990
       (Name, Address and Telephone Number of Person Authorized to Receive
                          Notices and Communications)

                               September 21, 1999
             (Date of Event which Requires Filing of this Statement)




If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box
|_|.

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all  exhibits.  See Rule 13d-7(b) for other
parties to whom copies are to be sent.

                         (Continued on following pages)

                               (Page 1 of 9 Pages)

* The remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


<PAGE>
                                  SCHEDULE 13D

CUSIP No. 81721M 10 9                                         Page 2 of 9 Pages



1            NAMES OF REPORTING PERSONS
             OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

             HRPT Properties Trust  I.R.S. ID No. 04-6558834

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*    (a) |_|
                                                                  (b) |_|

3            SEC USE ONLY


4            SOURCE OF FUNDS*

             WC

5            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
             TO ITEMS 2(d) OR 2(e)     |_|


6            CITIZENSHIP OR PLACE OF ORGANIZATION

             Maryland

                              7            SOLE VOTING POWER
         NUMBER OF
          SHARES                           26,000,000
       BENEFICIALLY
         OWNED BY
           EACH
         REPORTING
          PERSON
           WITH
                              8            SHARED VOTING POWER


                              9            SOLE DISPOSITIVE POWER

                                           26,000,000

                              10           SHARED DISPOSITIVE POWER


11           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

             26,000,000

12           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
             SHARES*                          |_|


13           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

             100%

14           TYPE OF REPORTING PERSON*

             OO
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                  SCHEDULE 13D

CUSIP No. 81721M 10 9                                        Page 3 of 9 Pages




1            NAMES OF REPORTING PERSONS
             OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

             REIT Management & Research, Inc.  I.R.S. ID No. 04-3402206

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) |_|
                                                                    (b) |_|

3            SEC USE ONLY


4            SOURCE OF FUNDS*

             OO

5            CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
             TO ITEMS 2(d) OR 2(e)     |_|


6            CITIZENSHIP OR PLACE OF ORGANIZATION

             Delaware

                              7            SOLE VOTING POWER
         NUMBER OF
          SHARES
       BENEFICIALLY
         OWNED BY
           EACH
         REPORTING
          PERSON
           WITH
                              8            SHARED VOTING POWER


                              9            SOLE DISPOSITIVE POWER


                              10           SHARED DISPOSITIVE POWER


11           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

             26,000,000

12           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
             SHARES*                          |_|


13           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

             100%

14           TYPE OF REPORTING PERSON*

             CO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                  SCHEDULE 13D

CUSIP No. 81721M 10 9                                       Page 4 of 9 Pages



Item 1.  Security and Issuer.

         The class of equity  securities to which this statement  relates is the
Common Shares of Beneficial Interest, par value $0.01 (the "Shares"),  of Senior
Housing Properties Trust, a Maryland real estate investment Trust ("SNH"),  with
its  principal   executive  offices  located  at  400  Centre  Street,   Newton,
Massachusetts 02458.

Item 2.  Identity and Background.

         The persons filing this statement are HRPT Properties Trust, a Maryland
real estate  investment trust ("HRP"),  and REIT Management & Research,  Inc., a
Delaware corporation ("RMR").

         HRP's  principal  business  is to operate as a real  estate  investment
trust.  The  principal  office of HRP is located at 400 Centre  Street,  Newton,
Massachusetts 02458. The trustees of HRP are Patrick F. Donelan,  Rev. Justinian
Manning,  C.P., Bruce M. Gans, M.D., Barry M. Portnoy and Gerard M. Martin.  The
executive  officers  of HRP are David J.  Hegarty,  President,  Chief  Operating
Officer and Secretary,  Ajay Saini,  Treasurer and Chief Financial Officer, John
A. Mannix, Executive Vice President and David M. Lepore, Senior Vice President.

         RMR's principal  business is providing advisory services to real estate
investment trusts such as SNH and others. The principal office of RMR is located
at 400 Centre  Street,  Newton,  Massachusetts  02458.  The directors of RMR are
David J. Hegarty,  Gerard M. Martin and Barry M. Portnoy. The executive officers
of RMR are David J. Hegarty,  President and Secretary, John G. Murray, Executive
Vice  President,  John A.  Mannix,  Vice  President,  Thomas  M.  O'Brien,  Vice
President, Ajay Saini, Vice President, David M. Lepore, Vice President, Jennifer
Clark,  Vice  President and John Popeo,  Treasurer.  Each of Messrs.  Martin and
Portnoy own 50% of the outstanding capital stock of RMR.

         Each of the  individuals  listed above (i) except for Ajay Saini,  is a
United  States  citizen,  (ii) except for Mr.  Donelan and Rev.  Manning,  has a
business  address at 400 Centre Street,  Newton,  Massachusetts  02458 and (iii)
except for Mr. Donelan,  Dr. Gans and Rev. Manning,  is principally  employed by
RMR in the capacity  specified  above. Mr. Saini is a citizen of the Republic of
India and a resident  of the  United  States.  Mr.  Hegarty  also  serves as the
President,  Secretary and Chief Operating  Officer of SNH. Mr. Saini also serves
as the Treasurer and Chief  Financial  Officer of SNH. Mr. Donelan is a Director
of  Dresdner  Kleinwort  Benson  and has a business  address at P.O.  Box 18075,
Riverbank  House, 2 Swan Lane,  London,  United Kingdom.  Dr. Gans is the Senior
Vice  President  for  Continuing  Care and  Chairman  of Physical  Medicine  and
Rehabilitation of Long Island Medical Center and has


<PAGE>


                                  SCHEDULE 13D

CUSIP No. 81721M 10 9                                       Page 5 of 9 Pages



a business  address of 270-05  76th St.,  Suite  E101,  New Hyde Park,  NY. Rev.
Manning  is the  pastor  of St.  Gabriel's  parish  at  201  Washington  Street,
Brighton, Massachusetts 02135.

         Neither HRP, RMR nor any of the individuals specified above has, during
the last five years, been convicted in a criminal proceeding  (excluding traffic
violations or similar misdemeanors), or been party to any civil proceeding which
resulted in a judgment, decree or final order enjoining future violations of, or
prohibiting or mandating activities subject to, federal or state securities laws
or finding any violation with respect to such laws.

Item 3.  Source and Amount of Funds or Other Consideration.

         HRPT Properties Trust, a Maryland real estate investment trust ("HRP"),
acquired  26,374,760  Shares  in  connection  with  the  formation  of  SNH  for
$263,747.60. On September 21, 1999, HRP contributed 374,760 Shares to SNH, which
were returned to the status of authorized but unissued shares.

Item 4.  Purpose of Transaction.

         The  transactions  which may require the filing of this  statement  are
described in Item 3 above and Item 5 below. The  transactions  were entered into
principally for investment purposes.

         On or shortly  after  October  12,  1999,  HRP will  distribute  to its
shareholders 13,190,763 Shares of its subsidiary, SNH, as a special distribution
(the "Spin-Off").  SNH owns 93 senior housing properties that cost $770 million,
which HRP previously  owned. The record date for the Spin-Off is October 8, 1999
(the "Record Date"). HRP shareholders will receive one Share for every 10 shares
of HRP that they own on the Record  Date.  The Shares to be  distributed  in the
Spin-Off have been registered under the Securities Act of 1933, as amended,  and
separately  listed on the New York Stock  Exchange  under the symbol  "SNH." The
foregoing  assumes  that 131.9  million  HRP shares will be  outstanding  on the
Record Date.

         RMR will enter into an  agreement to provide  advisory  services to SNH
(the "Advisory Agreement"). Pursuant to the terms of the Advisory Agreement, RMR
will be paid a base fee in cash and may earn an incentive fee payable in Shares.
Although HRP and RMR have no present intention to do so, they may make purchases
of Shares  from time to time,  in the open  market or in  private  transactions,
depending  on  their  respective  analysis  of  HPT's  business,  prospects  and
financial  condition,  the market for such stock,  other investment and business
opportunities  available to them,  general economic and stock market conditions,
proposals  from time to time sought by or presented  to them and other  factors.
HRP and RMR each intends to closely monitor their  investments and may from time
to time take  advantage of  opportunities  presented to them. HRP and RMR may in
the future also formulate plans or proposals


<PAGE>


                                  SCHEDULE 13D

CUSIP No. 81721M 10 9                                       Page 6 of 9 Pages



regarding SNH, including possible future plans or proposals concerning events or
transactions of the kind described in paragraphs (a) through (j) below.

         Depending upon HRP's and RMR's continuing  review of their  investments
and various other factors,  including those mentioned  above, HRP and/or RMR may
(subject to any applicable  securities laws and lock-up  arrangements) decide to
sell all or any part of the Shares,  although  they have no current  plans to do
so.

         Subject to the occurrence of the Spin-Off, David Hegarty and Ajay Saini
will resign their  positions as officers of, and Bruce M. Gans, M.D. will resign
his position as a Trustee of, HRP.  Messrs.  Hegarty and Saini will  continue to
serve as officers of RMR and SNH after the  Spin-Off.  Dr. Gans has been elected
as a Trustee of SNH subject to the  occurrence  of the Spin-Off and effective as
of the date the  shares  of SNH are  distributed  to the HRP  shareholders  (the
"Distribution Date").

         To fill the vacancies  created by the  resignations of Messrs.  Hegarty
and Saini,  John A. Mannix has been elected  President,  Chief Operating Officer
and  Secretary  and John Popeo has been elected  Treasurer  and Chief  Financial
Officer of HRP,  subject to the  occurrence  of the Spin-Off and effective as of
the  Distribution  Date. The vacancy created by the resignation of Dr. Gans as a
Trustee of HRP has not yet been filled.

         Except as set forth in this Item 4,  neither  HRP nor RMR has any plans
or proposals which related to or would result in:

         (a) The  acquisition by any person of additional  securities of SNH, or
the disposition of securities of SNH;

         (b)  An  extraordinary   corporate  transaction,   such  as  a  merger,
reorganization or liquidation, involving SNH or any of its subsidiaries;

         (c) A sale or transfer of a material  amount of assets of SNH or any of
its subsidiaries;

         (d) Any further  change in the present  board of trustees or management
of SNH  including  any  plans or  proposals  to  change  the  number or terms of
trustees or to fill any existing vacancies on the board;

         (e) Any material change in the present  capitalization  or distribution
policy of SNH;

         (f) Any other material change in SNH's business or corporate structure;



<PAGE>


                                  SCHEDULE 13D

CUSIP No. 81721M 10 9                                         Page 7 of 9 Pages



         (g)  Changes  in SNH's  declaration  of trust,  bylaws  or  instruments
corresponding  thereto or other  actions  which may impede  the  acquisition  of
control of SNH by any person;

         (h) Causing a class of securities of SNH to be delisted from a national
securities exchange or to cease to be authorized to be quoted in an inter-dealer
quotation system of a registered national securities association;

         (i)  A  class  of  equity  securities  of  SNH  becoming  eligible  for
termination  of  registration  pursuant to Section  12(g)(4)  of the  Securities
Exchange Act of 1934; or

         (j) Any action similar to any of those enumerated above.

Item 5.  Interest in Securities of the Issuer.

         (a) HRP currently holds  26,000,000  Shares,  or 100% of the issued and
outstanding  Shares.  RMR, as HRP's  investment  advisor,  may under  applicable
regulatory  definitions be deemed to beneficially own HRP's  26,000,000  Shares.
RMR, however,  expressly disclaims any beneficial  ownership of HRP's 26,000,000
Shares.

         (b) HRP has sole power to vote or dispose of its 26,000,000 Shares.

         (c) Except as disclosed in Item 3 above, no transactions in Shares have
been effected during the past sixty days by HRP or RMR.

         (d) No other  person is known to have the right to receive or the power
to direct the receipt of  distributions  from,  or the proceeds from the sale of
securities covered by this statement.

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

         Pursuant  to the  Transaction  Agreement,  to be  entered  into  by and
between  HRP and SNH,  HRP will  agree  during  the  period  ending on the first
anniversary of the completion of the Spin-Off that it will not sell, transfer or
otherwise  dispose of any of the  Shares  owned by it at the  completion  of the
Spin-Off  (after giving effect to the Spin-Off)  without the prior approval of a
majority of SNH's independent trustees.

         The SNH  Advisory  Agreement  requires  RMR to use its best  efforts to
present to SNH a continuing and suitable  investment program consistent with the
investment  policies and objectives of SNH. The SNH Advisory  Agreement provides
for an annual  advisory fee based upon SNH's average  invested  capital,  and an
annual incentive fee based upon increases in


<PAGE>


                                  SCHEDULE 13D


CUSIP No. 81721M 10 9                                         Page 8 of 9 Pages




SNH's funds from  operations.  The annual  incentive fee, if any, payable to RMR
will be paid in Shares.

         The initial term of the SNH Advisory  Agreement expires on December 31,
1999 and  renewal  or  extension  of the term  thereof  will be  subject  to the
periodic approval of a majority of SNH's independent trustees.

Item 7.  Material to be Filed as Exhibits.

         The following documents are filed as exhibits to this statement:

         99.1     Joint Filing Agreement, dated as of September 29, 1999, by and
                  between HRP and RMR.

         99.2     Form of Transaction Agreement by and between HRP and SNH.

         99.3     Form of Advisory Agreement by and between SNH and RMR.



<PAGE>


                                  SCHEDULE 13D

CUSIP No. 81721M 10 9                                      Page 9 of 9 Pages


                                    SIGNATURE


         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.


September 29, 1999                  HRPT PROPERTIES TRUST



                                    By:  /s/    David J. Hegarty
                                         David J. Hegarty, President



September 29, 1999                  REIT MANAGEMENT & RESEARCH, INC.



                                    By:  /s/    David J. Hegarty
                                         David J. Hegarty, President

                                                                    EXHIBIT 99.1

                                    AGREEMENT


         Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement  containing the information
required  by  Schedule  13D (or any  amendment  thereof)  need be filed on their
behalf with  respect to the  beneficial  ownership of any equity  securities  of
Senior  Housing  Properties  Trust,  a Maryland  real  estate  investment  trust
("SNH"), or any subsequent  acquisitions or dispositions of equity securities of
SNH by either of the undersigned.


Dated:  September 29, 1999             HRPT PROPERTIES TRUST



                                       By:   /s/    David J. Hegarty
                                             David J. Hegarty, President



                                       REIT MANAGEMENT & RESEARCH, INC.



                                       By:   /s/    David J. Hegarty
                                             David J. Hegarty, President




                                                                    EXHIBIT 99.2

                                     FORM OF
                              TRANSACTION AGREEMENT


                                 by and between


                              HRPT PROPERTIES TRUST


                                       and


                         SENIOR HOUSING PROPERTIES TRUST






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

                               __________ __, 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.........................................................................13
                  4.1      GAAP Allocations.  ...................................................................13
                  4.2      Cash Allocations.  ...................................................................13
                  4.3      No Other Prorations.  ................................................................13

SECTION 5     SURVIVAL; INDEMNIFICATION..........................................................................14
                  5.1      Indemnification by HRPT...............................................................14
                  5.2      Indemnification by Senior Housing.....................................................14
                  5.3      Indemnification Procedures............................................................14
                  5.4      Certain Limitations, Etc..............................................................16
                  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.....................................17
                  6.3      Filing and Payment Responsibility.....................................................17
                  6.4      Refunds and Credits...................................................................18
                  6.5      Tax Contests..........................................................................18
                  6.6      Resolution of Disputes................................................................19






<PAGE>




SECTION 7   MISCELLANEOUS........................................................................................19
                  7.1      Arbitration...........................................................................19
                  7.2      Confidentiality.......................................................................19
                  7.3      Notices...............................................................................19
                  7.4      Waivers, Etc..........................................................................20
                  7.5      Assignment; Successors and Assigns....................................................21
                  7.6      Severability..........................................................................21
                  7.7      Counterparts, Etc.....................................................................21
                  7.8      Governing Law.........................................................................21
                  7.9      Expenses..............................................................................21
                  7.10     Section and Other Headings............................................................22
                  7.11     Exculpation...........................................................................22
</TABLE>


EXHIBIT A         Form of Promissory Note

SCHEDULE I        Description of Premises
SCHEDULE II       Description of Tenant Leases
SCHEDULE III      Description of Transferred Subsidiaries





                                      -ii-

<PAGE>






                              TRANSACTION AGREEMENT


         TRANSACTION  AGREEMENT  made  __________  __, 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



<PAGE>




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.

         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 August
__, 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.




                                       -2-

<PAGE>



         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 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 thereon
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


                                       -3-

<PAGE>



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

         1.29  "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.

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

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

         1.32  "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.

         1.33  "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 ____________, 1999.

         1.34 "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.

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

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

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

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

         1.39  "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.




                                       -4-

<PAGE>



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

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

         1.42  "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.

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

         1.44 "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.

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

         1.46 "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.

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

         1.48  "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.

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

         1.50 "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.

         1.51 "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.

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



                                       -5-

<PAGE>




         1.53  "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.

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

         1.55  "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.

         1.56 "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.  HRPT and Senior
Housing agree and, by its joinder to this  Agreement  below,  SPTMRT  Properties
Trust  (which is a  Transferred  Subsidiary),  agrees to  effect  the  following
transactions:

                  (a) As of 9:00 a.m.,  Boston time, on the Effective Date, HRPT
         will transfer 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  shall be  partially in  consideration  of the deferred
         payments  described in clauses (b) and (c) below and otherwise shall be
         a contribution by HRPT to the capital of Senior Housing,  and (ii) each
         of the  other  Transferred  Subsidiaries,  which  transfer  shall  be 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  agrees  (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


                                       -6-

<PAGE>



         Payment from the Effective Date 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 agrees to assume and agrees to pay, as a primary  obligor and not
         as a  guarantor,  the  Deferred  Payment  by  delivery  to  HRPT on the
         Effective Date of a promissory note, bearing interest,  maturing on the
         date and otherwise on the terms and conditions contained in the form of
         promissory note attached to this Agreement as Exhibit A; and

                  (d) on the Effective  Date,  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.

         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


                                       -7-

<PAGE>



         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.

         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  the
         Effective  Date  pursuant to Section  2.2,  the Subject  Shares will be
         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
         will  constitute  all of the issued and  outstanding  shares of capital
         stock of each Transferred  Subsidiary,  and no Person other than Senior
         Housing  will  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 is acquiring 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


                                       -8-

<PAGE>



         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  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


                                       -9-

<PAGE>



         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 Property. 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
         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  repayment  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


                                      -10-

<PAGE>



         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 REIT
         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 REIT 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.

                  (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 of any  promissory  notes  evidencing  the  Deferred
         Payments.  Senior Housing  represents and warrants to HRPT that,  after
         giving  effect  to  the  Distributions  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.


                                      -11-

<PAGE>



                  (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 the Effective Date 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 REIT 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,  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 Independent Trustees.




                                      -12-

<PAGE>



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 the Transferred
         Subsidiaries  will declare a dividend of such cash and cash equivalents
         payable to HRPT as holder of record of the  Subsidiary  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

                                      -13-

<PAGE>




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

                  (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

                                      -14-

<PAGE>



         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"),  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


                                      -15-

<PAGE>



         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 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


                                      -16-

<PAGE>



         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 REITs 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 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


                                      -17-
<PAGE>

         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,  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.


                                      -18-

<PAGE>
         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 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



                                      -19-

<PAGE>

         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  successor 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.

         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



                                      -20-

<PAGE>

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.

         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



                                      -21-

<PAGE>

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  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 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



                                      -22-

<PAGE>

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:___________________________________
                                      Title:


                                SENIOR HOUSING PROPERTIES TRUST



                                By:___________________________________
                                      Title:


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

SPTMRT PROPERTIES TRUST



By:___________________________________
      Title:




                                      -23-

<PAGE>



                                                                    EXHIBIT A TO
                                                           TRANSACTION AGREEMENT


                                     Form of
                                 Promissory Note

THIS NOTE (OR ITS  PREDECESSOR)  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


$__________                                                               [DATE]
                                                       __________, Massachusetts

         FOR VALUE RECEIVED, SPTMRT PROPERTIES TRUST, a Maryland real estate
investment trust (the "Maker"), by this promissory note (this "Note"),  promises
unconditionally  to pay  to  HRPT  PROPERTIES  TRUST,  a  Maryland  real  estate
investment trust ("HRPT") or registered assigns (the "Holder") the principal sum
of  __________________________________________  DOLLARS  ($___________),  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 Maker 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.

         This Note is made by the Maker pursuant to the terms of the Transaction
Agreement,  dated as of  __________,  1999 (as  amended  from time to time,  the
"Transaction  Agreement"),  between HRPT and Senior Housing  Properties Trust, a
Maryland  real estate  investment  trust.  As used  herein,  the term  "Deferred
Payment  Date"  means the  earlier  to occur of (i) the 10th day  following  the
Distribution  Date (as such term is defined in the  Transaction  Agreement)  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 Maker 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, the Maker 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
Premises  (as  defined  in the  Transaction  Agreement)  owned by the  Maker and
perfected  first  assignments  of and  security  interests in all of the Maker's
Tenant Leases and Contracts (as defined in the Transaction Agreement) and all of
its 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 the Maker 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 the  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 the 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 Maker 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 Maker
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 his rights,  remedies,  powers or  privileges  hereunder  in any instance
shall not constitute a waiver thereof in that or any other instance.




                                       A-2

<PAGE>


         This Note may be assigned in whole or, with the prior  written  consent
of the Maker,  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), but any assignee shall take subject to
any and all  defenses  available to the Maker  whether at law or in equity.  The
Maker  shall keep a register  at its  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 Maker
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  SPTMRT PROPERTIES TRUST, A COPY
OF WHICH,  TOGETHER WITH ALL  AMENDMENTS  THERETO (THE  "DECLARATION"),  IS DULY
FILED IN THE OFFICE OF THE DEPARTMENT OF  ASSESSMENTS  AND TAXATION OF THE STATE
OF MARYLAND,  PROVIDES  THAT THE NAME "SPTMRT  PROPERTIES  TRUST"  REFERS TO THE
TRUSTEES UNDER THE DECLARATION COLLECTIVELY AS TRUSTEES, BUT NOT INDIVIDUALLY OR
PERSONALLY,  AND THAT NO  TRUSTEE,  OFFICER,  SHAREHOLDER,  EMPLOYEE OR AGENT OF
SPTMRT  PROPERTIES  TRUST SHALL BE HELD TO ANY  PERSONAL  LIABILITY,  JOINTLY OR
SEVERALLY, FOR ANY OBLIGATION OF, OR CLAIM AGAINST, SPTMRT PROPERTIES TRUST. ALL
PERSONS DEALING WITH SPTMRT PROPERTIES TRUST, IN ANY WAY, SHALL LOOK ONLY TO THE
ASSETS OF SPTMRT  PROPERTIES TRUST FOR THE PAYMENT OF ANY SUM OR THE PERFORMANCE
OF ANY OBLIGATION.

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

                                      SPTMRT PROPERTIES TRUST



                                      By:___________________________________
                                            Title:




                                       A-3


                                                                    EXHIBIT 99.3

                                     FORM OF
                               ADVISORY AGREEMENT


         THIS AGREEMENT is entered into effective as of  ____________,  1999, by
and among Senior Housing  Properties  Trust,  a Maryland real estate  investment
trust (the "Company"),  Reit Management & Research, Inc., a Delaware corporation
(the "Advisor"),  and, solely with respect to certain non-competition  covenants
in Section 14 of this Agreement, Barry M. Portnoy and Gerard M. Martin.

         WHEREAS,  the  Advisor is a  corporation  organized  for the purpose of
providing  management and administrative  services with respect to the ownership
of real property and interests in real property;

         WHEREAS,  in connection  with its  investments,  the Company desires to
make use of the advice and assistance of the Advisor and  information  available
to  the   Advisor,   and  to  have  the   Advisor   undertake   the  duties  and
responsibilities  hereinafter  set  forth,  on  behalf  of  and  subject  to the
supervision of the Company's Board of Trustees (the "Trustees"), all as provided
herein;

         WHEREAS, the Advisor is willing to render such services, subject to the
supervision of the Trustees, on the terms and conditions  hereinafter set forth;
and

         WHEREAS,  the Company has  qualified and intends to continue to qualify
as a real estate  investment  trust as defined in the  Internal  Revenue Code of
1986, as amended  (said Code, as in effect from time to time,  together with any
regulations  and  rulings  thereunder,  being  hereinafter  referred  to as  the
"Internal Revenue Code").

         NOW,  THEREFORE,  in consideration of the mutual  agreements herein set
forth, the parties hereto agree as follows:

         1.  General  Duties  of the  Advisor.  The  Advisor  shall use its best
efforts to present to the Company a continuing and suitable  investment  program
consistent with the investment  policies and objectives of the Company.  Subject
to the  supervision  of the Trustees and under their  direction,  and consistent
with the provisions of the Declaration of Trust, the Advisor shall:

                (a)  serve  as  the  Company's  investment  advisor,   with  its
         obligations to include providing  research and economic and statistical
         data in connection  with the  Company's  investments  and  recommending
         changes in the Company's investment policies, when appropriate;

                (b)   investigate   and  evaluate   investment,   financing  and
         refinancing  opportunities  and make  recommendations  concerning these
         opportunities to the Trustees;

<PAGE>

                (c) manage the Company's short-term  investments,  including the
         acquisition and sale of money market instruments in accordance with the
         Company's policies;

                (d)  administer the day-to-day operations of the Company;

                (e) investigate,  negotiate and enter into appropriate contracts
         on behalf  of the  Company  with  individuals,  corporations  and other
         entities  (i) for the  purchase,  lease or servicing of real estate and
         related  interests  and  otherwise  in  furtherance  of the  investment
         activities of the Company and (ii) for the financing and refinancing of
         investments and otherwise in furtherance of the financing activities of
         the Company;

                (f) upon request of the  Trustees,  act as  attorney-in-fact  or
         agent in  acquiring  and  disposing  of  investments  and  funds of the
         Company and in  handling,  prosecuting  and  settling any claims of the
         Company;

                (g) obtain for the Company,  when  appropriate,  the services of
         property  managers or management  firms to perform  customary  property
         management  services with regard to the real estate properties owned by
         or in the  possession of the Company,  and perform such  supervisory or
         monitoring  services  on  behalf of the  Company  with  respect  to the
         activities of those property  managers or management  firms as would be
         performed by a prudent owner,  including but not limited to supervising
         the activities of property managers or management  firms,  visiting the
         properties,  participating in property management budgeting,  reviewing
         the  accounting  of  property  income and  expenses,  reporting  on the
         financial   status  of  the  properties  and  reviewing  and  approving
         marketing plans,  but excluding the actual on-site property  management
         functions performed by said property managers or management firms;

                (h) obtain for the Company other services as may be required for
         other activities relating to the investment portfolio of the Company;

                (i)  administer  the  day-to-day   bookkeeping   and  accounting
         functions as are required  for the proper  management  of the assets of
         the  Company,  contract  for audits and prepare or cause to be prepared
         reports as may be required by any governmental  authority in connection
         with the ordinary conduct of the Company's business,  including without
         limitation,  periodic reports, returns or statements required under the
         Securities Exchange Act of 1934, as amended, the Internal Revenue Code,
         the  securities  and tax  statutes  of any  jurisdiction  in which  the
         Company is obligated to file such reports, or the rules and regulations
         promulgated under any of the foregoing;

                (j)  provide  office  space,  office  equipment  and  the use of
         accounting or computing equipment when required,  and provide personnel
         necessary for the performance of the foregoing services; and

                (k) from time to time, or at any time requested by the Trustees,
         make  reports  to the  Trustees  of its  performance  of the  foregoing
         services to the Company.


                                       -2-
<PAGE>

         In  performing  its  services  under this  Agreement,  the  Advisor may
utilize facilities,  personnel and support services of various of its Affiliates
(as defined below).  The Advisor shall be responsible for paying such Affiliates
for their  personnel and support  services and  facilities out of its own funds.
Notwithstanding the above, the Company may request,  and will pay for the direct
costs of,  services  provided by  Affiliates  of the Advisor  provided that such
request is approved by a majority vote of the Trustees who are not Affiliates of
the Advisor (the "Independent Trustees").

         As  used in this  Agreement,  the  term  "Affiliate"  means,  as to the
Advisor,  (i) any  other  Person  (as  defined  below)  directly  or  indirectly
controlling,  controlled by or under common  control with the Advisor,  (ii) any
other Person that owns beneficially,  directly or indirectly,  five percent (5%)
or more of the  outstanding  capital  stock,  shares or equity  interests of the
Advisor, or (iii) any officer, director, trustee, employee or general partner of
the Advisor or of any Person controlling,  controlled by or under common control
with  the  Advisor.   The  term   "Person"   means  and  includes   individuals,
corporations,  limited  partnerships,  general  partnerships,  limited liability
companies, joint stock companies or associations,  joint ventures, associations,
companies,  trusts,  banks,  trust companies,  land trusts,  business trusts and
other entities.

         2. Bank Accounts.  The Advisor shall establish and maintain one or more
bank  accounts in its own name or in the name of the Company,  and shall collect
and deposit into the account or accounts and  disburse  therefrom  any monies on
behalf of the Company; provided that no funds in any account shall be commingled
with any funds of the Advisor or any other  Person.  The Advisor shall from time
to time render an  appropriate  accounting  of  collections  and payments to the
Trustees and to the auditors of the Company.

         3. Records. The Advisor shall maintain appropriate books of account and
records relating to services performed  pursuant to this Agreement,  which books
of account and records shall be available for inspection by  representatives  of
the Company upon reasonable notice during ordinary business hours.

         4. Information  Furnished Advisor. The Trustees shall at all times keep
the  Advisor  fully  informed  with  regard to the  investment  policies  of the
Company,  the capitalization  policy of the Company, and generally the Trustees'
then-current  intentions  as to the future of the Company.  In  particular,  the
Company shall notify the Advisor  promptly of its intention to sell or otherwise
dispose of any of the Company's  investments or to make any new investment.  The
Company  shall  furnish  the  Advisor  with a  certified  copy of all  financial
statements,  a signed copy of each  report  prepared  by  independent  certified
public  accountants  and other  information  with  regard to its  affairs as the
Advisor may from time to time reasonably request. The Company shall retain legal
counsel and  accountants to provide legal and accounting  advice and services as
the Advisor or the Trustees  shall deem  necessary or  appropriate to adequately
perform  the  functions  of the  Company,  and shall  have  legal or  accounting
opinions and advice as the Advisor shall reasonably request.

         5. REIT Qualification.  Anything else in this Agreement to the contrary
notwithstanding,  the Advisor shall refrain from any action (including,  without
limitation,  the  furnishing  or rendering of services to tenants of property or
managing real  property)  which,  in its judgment made in good faith,  or in the
judgment of the  Trustees as  transmitted  to the Advisor in writing,  would (a)
adversely

                                      -3-

<PAGE>

affect the status of the  Company as a real estate  investment  trust as defined
and limited in the Internal Revenue Code or which would make the Company subject
to the Investment Company Act of 1940, as amended, or (b) violate any law, rule,
regulation  or statement  of policy or any  governmental  body or agency  having
jurisdiction  over the Company or over its  securities,  or (c) otherwise not be
permitted by the  Declaration  of Trust or Bylaws of the  Company,  as in effect
from time to time,  except if the action  shall be ordered by the  Trustees,  in
which event the Advisor  shall  promptly  notify the  Trustees of the  Advisor's
judgment that the action would adversely  affect the Company's status or violate
any law, rule or regulation or the Declaration of Trust or Bylaws of the Company
and shall  refrain  from  taking the action  pending  further  clarification  or
instructions from the Trustees. In addition,  the Advisor shall take affirmative
steps  which,  in its  judgment  made in good faith,  or in the  judgment of the
Trustees as  transmitted  to the Advisor in writing,  would  prevent or cure any
action described in (a), (b) or (c) above.

         6.  Self-Dealing.  Neither the Advisor nor any Affiliate of the Advisor
shall,  directly or  indirectly,  sell any  property or assets to the Company or
purchase any property or assets from the  Company,  lease any property  from the
Company or borrow any money from the  Company,  except as approved by a majority
of the  Independent  Trustees.  In  addition,  except as  otherwise  provided in
Sections  1,  9 or 10  hereof,  or  except  as  approved  by a  majority  of the
Independent Trustees, neither the Advisor nor any Affiliate of the Advisor shall
receive  any  commission  or other  remuneration,  directly  or  indirectly,  in
connection  with  the  activities  of  the  Company  or  any  joint  venture  or
partnership in which the Company is a party.  The foregoing  prohibitions  shall
not apply to the leases affecting three nursing homes between the Company and an
Affiliate  of the  Advisor,  which  leases were  entered  into by the  Company's
predecessor in interest prior to the date of this Agreement.

         7. No Partnership or Joint Venture. The Company and the Advisor are not
partners  or joint  venturers  with  each  other and  neither  the terms of this
Agreement nor the fact that the Company and the Advisor have joint  interests in
any one or more investments  shall be construed so as to make them such partners
or joint venturers or impose any liability on either of them.

         8.  Fidelity  Bond.  The  Advisor  shall not be  required  to obtain or
maintain a fidelity  bond in  connection  with the  performance  of its services
hereunder.

         9.  Compensation.  The  Advisor  shall  be paid an  advisory  fee  (the
"Advisory Fee") for the services  rendered by it to the Company pursuant to this
Agreement. The Advisory Fee for each full fiscal year of the Company shall equal
the sum of  one-half  of one percent  (0.5%) of the Annual  Average  Transferred
Assets (as defined below), plus seven-tenths of one percent (0.7%) of the Annual
Average Invested Capital (as defined below) up to $250,000,000, plus one-half of
one percent (0.5%) of the Annual Average  Invested Capital equal to or exceeding
$250,000,000.  The Advisory Fee shall be prorated for any partial fiscal year of
the Company during the term of this Agreement. In addition, the Advisor shall be
paid an annual  incentive fee (the "Incentive  Fee") for each fiscal year of the
Company,  commencing  with the Company's  fiscal year ending  December 31, 2000,
consisting  of a number of shares of the  Company's  common shares of beneficial
interest  ("Common  Shares")  with an aggregate  value  (determined  as provided
below) equal to fifteen percent (15%) of the product of (i) the weighted average
Common Shares of the Company outstanding on

                                       -4-

<PAGE>

a diluted  basis  during  such fiscal year and (ii) the excess if any of FFO Per
Share (as  defined  below) for such  fiscal  year over the FFO Per Share for the
preceding  fiscal year;  provided  however,  in no event shall the Incentive Fee
payable in respect of any fiscal  year exceed $.02  multiplied  by the  weighted
average  number of Common  Shares  outstanding  on a diluted  basis  during such
fiscal year.  (The Advisory Fee and Incentive Fee are  hereinafter  collectively
referred to as the "Fees").  No Incentive Fee shall be payable for the Company's
fiscal year ending December 31, 1999.

         For purposes of this Agreement:  "Annual Average Transferred Assets" of
the Company,  for any fiscal year,  means the daily weighted average during such
fiscal year (or, in the case of the  Company's  fiscal year ending  December 31,
1999,  during the period  commencing with the date hereof and ending on December
31,  1999)  of the  aggregate  book  value  of the  Transferred  Assets,  before
depreciation,  reserves for bad debts and other similar  noncash items.  "Annual
Average Invested  Capital" of the Company,  for any fiscal year, means the daily
weighted  average  during such  fiscal  year (or,  in the case of the  Company's
fiscal year ending December 31, 1999, during the period commencing with the date
hereof and  ending on  December  31,  1999) of the  aggregate  book value of the
consolidated assets of the Company,  excluding the Transferred Assets, invested,
directly or indirectly,  in equity interests in and loans secured by real estate
and  personal  property  owned in  connection  with  such  real  estate,  before
depreciation,  reserves for bad debts and other similar noncash items.  "FFO Per
Share," for any fiscal year,  means (i) the Company's  consolidated  net income,
computed in accordance with generally  accepted  accounting  principles,  before
gain or loss on sale of properties and  extraordinary  items,  depreciation  and
other non-cash  items,  including the Company's pro rata share of the funds from
operations  (determined in accordance  with this clause) for such fiscal year of
(A) any  unconsolidated  subsidiary  and (B) any  entity  for which the  Company
accounts  by the  equity  method of  accounting,  divided  by (ii) the  weighted
average  number of Common  Shares  outstanding  on a diluted  basis  during such
fiscal year;  "Transferred Assets" means the assets owned by the Company and its
subsidiaries  on the date hereof.  FFO Per Share for the  Company's  fiscal year
ending December 31, 1999 shall be calculated on a pro forma basis adjusted as if
the transactions  described in the notes to the unaudited pro forma consolidated
financial  statements  of the Company  contained in the  Company's  Registration
Statement No.  333-69703  filed with the Securities and Exchange  Commission (as
amended through the date hereof) had occurred as of January 1, 1999.

         The Advisory Fee shall be computed and paid by the Company on a year to
date basis within thirty (30) days following the end of each fiscal month. These
computations  shall be based upon the Company's  monthly or quarterly  financial
statements, as the case may be, and shall be in reasonable detail. The Incentive
Fee shall be computed and paid by the Company  within thirty (30) days following
the public availability of the Company's annual audited financial statements for
each fiscal year. A copy of the computations  shall promptly be delivered to the
Advisor accompanied by payment of the Fees shown thereon to be due and payable.

         The  aggregate  Fees paid for each  fiscal  year  shall be  subject  to
adjustment  as of the end of each that  year.  On or  before  the 30th day after
public  availability of the Company's  annual audited  financial  statements for
each  fiscal  year,  the  Company  shall  deliver to the  Advisor  an  Officer's
Certificate (a "Certificate") reasonably acceptable to the Advisor and certified
by an authorized  officer of the Company  setting  forth (i) the Annual  Average
Transferred Assets, the Annual Average

                                       -5-
<PAGE>


Invested  Capital and FFO Per Share for the Company's fiscal year ended upon the
immediately  preceding  December 31, and (ii) the Company's  computation  of the
Fees payable for the fiscal year.  The  Certificate  shall be  accompanied by an
examination of the  calculation of Annual Average  Invested  Capital and FFO Per
Share by the Company's independent certified public accountants.

         If the  aggregate  Fees  payable  for any  fiscal  year as shown in the
Certificate  exceed the aggregate  amounts  previously paid by the Company,  the
Company  shall pay the  deficit to the  Advisor at the time of  delivery  of the
Certificate.

         If the  aggregate  Fees  payable  for any  fiscal  year as shown in the
Certificate are less than the aggregate amounts  previously paid by the Company,
the Company  shall  specify in the  Certificate  whether the Advisor  should (i)
refund  to the  Company  an amount  equal to the  difference  or (ii)  grant the
Company  a  credit  against  the  Fees  next  coming  due in the  amount  of the
difference until that amount has been fully paid or otherwise discharged.

         Payment  of the  Incentive  Fee  shall be made by  issuance  of  Common
Shares.  The number of shares to be issued in payment of the Incentive Fee shall
be the whole number of shares  (disregarding any fraction) equal to the value of
the Incentive Fee, as provided  above,  divided by the average  closing price of
the Common Shares on the New York Stock Exchange during the month before the end
of the fiscal year for which the computation is made.

         10. Compensation for Additional  Services.  If, and to the extent that,
the  Company  shall  request  the  Advisor to render  services  on behalf of the
Company  other than those  required to be rendered by the Advisor in  accordance
with the terms of this Agreement, those additional services shall be compensated
separately  on terms to be agreed upon  between the Advisor and the Company from
time to time.  In addition,  the Company may make awards to the employees of the
Advisor and others under the Company's 1999 Incentive Share Award Plan.

         11.  Expenses  of the  Advisor.  Without  regard  to  the  compensation
received by the Advisor from the Company pursuant to this Agreement, the Advisor
shall bear the following expenses incurred in connection with the performance of
its duties under this Agreement:

                (a)  employment  expenses  of  the  personnel  employed  by  the
         Advisor,  including but not limited to, salaries,  wages, payroll taxes
         and the cost of employee benefit plans;

                (b)  fees and  travel  and  other  expenses  paid to  directors,
         officers and employees of the Advisor, except fees and travel and other
         expenses  of  persons  who are  Trustees  or  officers  of the  Company
         incurred in their capacities as Trustees or officers of the Company;

                (c) rent, telephone,  utilities, office furniture, equipment and
         machinery  (including  computers,  to the  extent  utilized)  and other
         office expenses of the Advisor, except to the extent those expenses may
         relate solely to an office  maintained by the Company separate from the
         office of the Advisor, if any; and

                                       -6-
<PAGE>

                (d)   miscellaneous    administrative   expenses   incurred   in
         supervising,   monitoring  and  inspecting   real  property  and  other
         investments of the Company or relating to performance by the Advisor of
         its obligations hereunder.

         12. Expenses of the Company.  Except as expressly otherwise provided in
this  Agreement,  the  Company  shall pay all its  expenses  not  payable by the
Advisor,  and,  without  limiting  the  generality  of  the  foregoing,   it  is
specifically  agreed that the following expenses of the Company shall be paid by
the Company and shall not be paid by the Advisor:

                  (a) the cost of borrowed money;

                  (b)  taxes  on  income  and  taxes  and  assessments  on  real
         property, if any, and all other taxes applicable to the Company;

                  (c)  legal,  auditing,  accounting,  underwriting,  brokerage,
         listing,   reporting,   registration  and  other  fees,  and  printing,
         engraving and other expenses and taxes incurred in connection  with the
         issuance,  distribution,  transfer,  trading,  registration  and  stock
         exchange  listing  of  the  Company's  securities,  including  transfer
         agent's, registrar's and indenture trustee's fees and charges;

                  (d) expenses of  organizing,  restructuring,  reorganizing  or
         terminating  the  Company,  or of  revising,  amending,  converting  or
         modifying the Company's organizational documents;

                  (e) fees and travel and other  expenses  paid to Trustees  and
         officers of the Company in their  capacities  as such (but not in their
         capacities as officers or employees of the Advisor) and fees and travel
         and other expenses paid to advisors,  contractors,  mortgage servicers,
         consultants,  and other agents and independent  contractors employed by
         or on behalf of the Company;

                  (f)  Expenses   directly   connected  with  the   acquisition,
         disposition  or  ownership of real estate  interests or other  property
         (including  the  costs  of  foreclosure,   insurance  premiums,   legal
         services,  brokerage  and  sales  commissions,   maintenance,   repair,
         improvement and local management of property), other than expenses with
         respect  thereto of employees of the Advisor,  to the extent that those
         expenses are to be borne by the Advisor pursuant to Section 11 above;

                  (g) all  insurance  costs  incurred  in  connection  with  the
         Company  (including  officer and  trustee  liability  insurance)  or in
         connection  with any officer and trustee  indemnity  agreement to which
         the Company is a party;

                  (h) expenses  connected with payments of dividends or interest
         or contributions in cash or any other form made or caused to be made by
         the Trustees to holders of securities of the Company;

                                       -7-

<PAGE>

                  (i) all expenses  connected with  communications to holders of
         securities  of the  Company and other  bookkeeping  and  clerical  work
         necessary  to   maintaining   relations  with  holders  of  securities,
         including the cost of printing and mailing  certificates for securities
         and  proxy  solicitation  materials  and  reports  to  holders  of  the
         Company's securities;

                  (j) legal, accounting and auditing fees and expenses; and

                  (k)  expenses  relating  to any  office or  office  facilities
         maintained by the Company separate from the office of the Advisor.

         13.  Limits  of  Advisor   Responsibility.   The  Advisor   assumes  no
responsibility  other than to render the services described herein in good faith
and shall not be  responsible  for any action of the  Trustees in  following  or
declining to follow any advice or  recommendation  of the Advisor.  The Advisor,
its shareholders, directors, officers, employees, agents and Affiliates will not
be liable to the Company, its shareholders,  or others, except by reason of acts
constituting bad faith,  willful or wanton misconduct or gross  negligence.  The
Company  shall  reimburse,   indemnify  and  hold  harmless  the  Advisor,   its
shareholders,  directors,  officers and employees, agents and Affiliates for and
from any and all expenses,  losses, damages,  liabilities,  demands, charges and
claims of any  nature  whatsoever  in  respect  of or  arising  from any acts or
omissions of the Advisor  undertaken  in good faith and in  accordance  with the
standard  set  forth  above  pursuant  to the  authority  granted  to it by this
Agreement.

         14.  Other  Activities  of the  Advisor and its  Stockholders.  Nothing
herein shall prevent the Advisor from engaging in other activities or businesses
or from  acting as  advisor to any other  Person  (including  other real  estate
investment  trusts)  even  though  that  Person  has  investment   policies  and
objectives similar to those of the Company; provided,  however, that neither the
Advisor nor Barry M. Portnoy or Gerard M. Martin shall provide advisory services
to, make competitive direct investment in or, in the case of Messrs. Portnoy and
Martin,  serve as a director  or officer  of, any other real  estate  investment
trust  which is  principally  engaged in the  business  of  ownership  of senior
apartments,  congregate communities,  assisted living or nursing home properties
without the consent of the Independent Trustees.  The Advisor shall be free from
any obligation to present to the Company any particular  investment  opportunity
which comes to the Advisor.  In addition,  except as expressly  provided herein,
nothing  herein shall prevent any  stockholder  or Affiliate of the Advisor from
engaging  in any other  business or from  rendering  services of any kind to any
other corporation,  partnership or other entity (including  competitive business
activities). Without limiting the foregoing provisions, the Advisor agrees, upon
the  request of any  Trustee of the  Company,  to  disclose  certain  investment
information  concerning  the  Advisor or certain  of its  Affiliates,  provided,
however,  that the disclosure shall be required only if it does not constitute a
breach of any fiduciary duty or obligation of Advisor.

         Directors,  officers,  employees  and  agents of the  Advisor or of its
Affiliates  may serve as  Trustees,  officers,  employees,  agents,  nominees or
signatories  of the Company.  When  executing  documents or otherwise  acting in
capacities for the Company,  these persons shall use their respective  titles in
the Company.

                                       -8-
<PAGE>

         15.  Term,  Termination.  This  Agreement  shall  continue in force and
effect  until  December  31,  1999  (the  "Initial  Term"),   and  is  renewable
periodically  thereafter  by the  Company,  if a  majority  of  the  Independent
Trustees determine that the Advisor's performance has been satisfactory.

         Paragraph  18  hereof  shall   govern  the  rights,   liabilities   and
obligations of the parties upon  termination of this  Agreement;  and, except as
provided in paragraph 18, a termination  shall be without  further  liability of
either party to the other than for breach or violation of this  Agreement  prior
to termination.

         16. Assignment. The Company may terminate this Agreement at any time in
the  event  of  its  assignment  by  the  Advisor  except  an  assignment  to  a
corporation,  partnership,  trust, or other successor entity which may take over
the property and carry on the affairs of the Advisor; provided that, following a
permitted  assignment,  the persons who controlled the operations of the Advisor
immediately  prior  to  the  assignment  shall  control  the  operation  of  the
successor,  including the  performance of its duties under this  Agreement,  and
this successor shall be bound by the same  restrictions by which the Advisor was
bound prior to such assignment.  A permitted  assignment or any other assignment
of this  Agreement by the Advisor shall bind the assignee  hereunder in the same
manner as the Advisor is bound hereunder. This Agreement shall not be assignable
by the Company without the prior written  consent of the Advisor,  except in the
case of any  assignment by the Company to a trust,  corporation,  partnership or
other entity which is the successor to the Company,  in which case the successor
shall be bound hereby and by the terms of said assignment in the same manner and
to the same extent as the Company is bound hereby.

         17. Default, Bankruptcy, Etc. of the Advisor. At the sole option of the
Company, this Agreement may be terminated immediately by written notice from the
Trustees to the Advisor if any of the following events shall have occurred:

                (a) the  Advisor  shall  have  violated  any  provision  of this
         Agreement and, after written notice from the Trustees of the violation,
         shall have failed to cure the default within thirty (30) days;

                (b) a petition  shall have been filed against the Advisor for an
         involuntary proceeding under any applicable  bankruptcy,  insolvency or
         other similar law now or hereafter in effect,  and that petition  shall
         not have been dismissed  within ninety (90) days of filing;  or a court
         having  jurisdiction  shall  have  appointed  a  receiver,  liquidator,
         assignee,  custodian,  trustee, sequestrator or similar official of the
         Advisor for any  substantial  portion of its  property,  or ordered the
         winding up or liquidation of its affairs, and that appointment or order
         shall not have been rescinded or vacated within ninety (90) days of the
         appointment or order; or

                (c) the Advisor  shall have  commenced  a  voluntary  proceeding
         under any applicable bankruptcy, insolvency or other similar law now or
         hereafter in effect, or shall have made any general  assignment for the
         benefit of creditors,  or shall have failed  generally to pay its debts
         as they became due.


                                       -9-

<PAGE>

         The Advisor  agrees that, if any of the events  specified in paragraphs
(b) or (c) of this Section 17 occur,  it will give written notice thereof to the
Trustees within seven (7) days following the occurrence of the event.

         18. Action Upon  Termination.  From and after the effective date of any
termination  of this  Agreement  pursuant to Sections  15, 16 or 17 hereof,  the
Advisor shall be entitled to no compensation for services rendered hereunder for
the remainder of the then-current term of this Agreement but shall be paid, on a
pro  rata  basis,  all   compensation  due  for  services   performed  prior  to
termination,  including,  without  limitation,  a pro rata  portion  of the then
current year's Incentive Fee. Upon termination, the Advisor immediately shall:

                  (a) pay over to the Company all monies  collected and held for
         the  account of the Company by it  pursuant  to this  Agreement,  after
         deducting  therefrom  any accrued and unpaid Fees  (including,  without
         limitation,  a pro rata  portion of the then current  year's  Incentive
         Fee, and reimbursements for its expenses to which it is then entitled);

                  (b) deliver to the  Trustees a full and  complete  accounting,
         including a statement  showing all sums collected by it and a statement
         of all  sums  held  by it for  the  period  commencing  with  the  date
         following the date of its last accounting to the Trustees; and

                  (c) deliver to the Trustees all property and  documents of the
         Company then in its custody or possession.

         The  amount  of Fees  paid to the  Advisor  upon  termination  shall be
subject to adjustment pursuant to the following mechanism. On or before the 30th
day  after  public  availability  of  the  Company's  annual  audited  financial
statements for the fiscal year in which  termination  occurs,  the Company shall
deliver to the Advisor a  Certificate  reasonably  acceptable to the Advisor and
certified by an authorized  officer of the Company  setting forth (i) the Annual
Average  Invested  Capital and FFO Per Share for the Company's fiscal year ended
upon the immediately  preceding December 31, and (ii) the Company's  computation
of the Fees  (including,  without  limitation,  a pro rata  portion  of the then
current  year's  Incentive  Fee)  payable  upon  the  date of  termination.  The
Certificate  shall be  accompanied  by a review  of the  calculation  of  Annual
Average  Invested  Capital  and  FFO  Per  Share  by the  Company's  independent
certified public accountants.

         If the annual Fees owed upon  termination  as shown in the  Certificate
exceed the Fees paid by the Company upon termination,  the Company shall include
its  check  for the  deficit  and  deliver  the  same to the  Advisor  with  the
Certificate.

         The  Incentive  Fee for any partial  fiscal year will be  determined by
multiplying  the Incentive Fee for such year  (assuming  this  Agreement were in
effect for the entire year) by a fraction,  the numerator of which is the number
of days in the portion of such year during which this  Agreement  was in effect,
and the denominator of which shall be 365.

                                      -10-
<PAGE>

         If the annual Fees owed upon  termination  as shown in the  Certificate
are less than the Fees paid by the Company upon  termination,  the Advisor shall
remit to the Company its check in an amount equal to the difference.

         19.  Trustee  Action.  Wherever  action on the part of the  Trustees is
contemplated by this Agreement, action by a majority of the Trustees,  including
a majority of the Independent Trustees, shall constitute the action provided for
herein.

         20.  Arbitration.  The Company  and the Advisor  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, 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.

         21. TRUSTEES AND SHAREHOLDERS  NOT LIABLE.  THE DECLARATION OF TRUST OF
THE COMPANY, A COPY OF WHICH, TOGETHER WITH ALL AMENDMENTS, IS DULY FILED IN THE
OFFICE OF THE STATE DEPARTMENT OF ASSESSMENTS AND TAXATION OF MARYLAND  PROVIDES
THAT  THE  NAME  SENIOR  HOUSING   PROPERTIES   TRUST  REFERS  TO  THE  TRUSTEES
COLLECTIVELY  AS  TRUSTEES,  BUT NOT  INDIVIDUALLY  OR  PERSONALLY.  NO TRUSTEE,
OFFICER,  SHAREHOLDER,  EMPLOYEE  OR AGENT OF THE  COMPANY  SHALL BE HELD TO ANY
PERSONAL  LIABILITY,  JOINTLY  OR  SEVERALLY,  FOR ANY  OBLIGATION  OF, OR CLAIM
AGAINST,  THE COMPANY.  ALL PERSONS DEALING WITH THE COMPANY,  IN ANY WAY, SHALL
LOOK  ONLY  TO THE  ASSETS  OF THE  COMPANY  FOR THE  PAYMENT  OF ANY SUM OR THE
PERFORMANCE OF ANY OBLIGATION.

         22.  Notices.  Any notice,  report or other  communication  required or
permitted to be given  hereunder shall be in writing unless some other method of
giving the  notice,  report or other  communication  is accepted by the party to
whom it is  given,  and  shall  be given by  being  delivered  at the  following
addresses to the parties hereto:

         If to the Company:

                           Senior Housing Properties Trust
                           400 Centre Street
                           Newton, Massachusetts 02458
                           Attention:  President

                                      -11-
<PAGE>


         If to the Advisor:

                           Reit Management & Research, Inc.
                           400 Centre Street
                           Newton, Massachusetts 02458
                           Attention:  President

         Such notice shall be effective upon its receipt by the party to whom it
is directed.  Either party hereto may at any time give notice to the other party
in writing of a change of its address for purposes of this paragraph 21.

         23. Amendments.  The Agreement shall not be amended, changed, modified,
terminated, or discharged in whole or in part except by an instrument in writing
signed by each of the  parties  hereto,  or by their  respective  successors  or
assigns, or otherwise as provided herein.

         24.  Successors and Assigns.  This Agreement  shall be binding upon any
successors or permitted assigns of the parties hereto as provided herein.

         25.  Governing Law. The provisions of this Agreement  shall be governed
by  and  construed  in  accordance   with  the  laws  of  The   Commonwealth  of
Massachusetts.

         26. Captions.  The captions included herein have been inserted for ease
of reference only and shall not be construed to affect the meaning, construction
or effect of this Agreement.

         27. Entire Agreement.  This Agreement  constitutes the entire agreement
of the parties  hereto with respect to the subject  matter hereof and supersedes
and cancels any pre-existing agreements with respect to its subject matter.

         28. Attorneys' Fees. If any legal action is brought for the enforcement
of this  Agreement,  or  because  of an  alleged  dispute,  breach,  default  or
misrepresentation  in connection  with any of the provisions of this  Agreement,
the  successful  or  prevailing  party or parties  shall be  entitled to recover
reasonable  attorneys'  fees and other costs incurred in that action in addition
to any other relief to which it or they may be entitled.

         29. Survival.  The provisions of Sections 13, 14, 18, 20, 21, 22 and 28
of this Agreement shall survive the termination hereof.

                  [Remainder of page intentionally left blank.]

                                      -12-

<PAGE>



         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorized  officers,  under seal, as of the day and year
first above written.

                                      SENIOR HOUSING PROPERTIES TRUST



                                      By:_________________________________
                                            Its:


                                      REIT MANAGEMENT & RESEARCH, INC.



                                      By:_________________________________
                                            Its:


                                      Solely as to Section 14 hereof:



                                      ------------------------------------
                                      Barry M. Portnoy



                                      ------------------------------------
                                      Gerard M. Martin



                                      -13-


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