Document:

EXHIBIT 4.18

              ----------------------------------------------------
                                    FORM OF

                              AMENDED AND RESTATED

                                 TRUST AGREEMENT

                                      among

                           SNH CAPITAL TRUST HOLDINGS

                                   as Sponsor,

                       STATE STREET BANK AND TRUST COMPANY
                              as Property Trustee,

                                       and

                        THE REGULAR TRUSTEES NAMED HEREIN

                                   Relating to

                               SNH CAPITAL TRUST I

                            Dated as of June 21, 2001

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

<PAGE>
 Certain Sections of this Trust Agreement relating to Sections 310 through 318,
                 inclusive, of the Trust Indenture Act of 1939:

Trust Indenture                                                     Trust
  Act Section                                                 Agreement Section

ss.310(a)(1).................................................................8.7
      (a)(2).................................................................8.7
      (a)(3)......................................................Not Applicable
      (a)(4).................................................................2.7
      (a)(5).................................................................8.7
      (b)....................................................................8.8
      (c).........................................................Not Applicable
ss.311(a)...................................................................8.12
      (b)...................................................................8.12
      (c).........................................................Not Applicable
ss.312.......................................................................5.7
ss.313(a)...................................................................8.13
      (b).........................................................Not Applicable
      (c)...................................................................8.13
      (d)...................................................................8.13
ss.314(a)...................................................................8.14
      (b).........................................................Not Applicable
      (c)...................................................................8.15
      (d).........................................................Not Applicable
      (e)..............................................................1.1, 8.15
ss.315(a)...............................................................8.1, 8.3
      (b)....................................................................8.2
      (c)....................................................................8.1
      (d)...............................................................8.1, 8.3
      (e).........................................................Not Applicable
ss.316(a)...............................................................6.1, 8.2
      (b)....................................................................6.8
      (c)....................................................................6.7
ss.317(a)...............................................................2.7, 8.1
      (b)....................................................................5.9
ss.318(a)..................................................................10.10

----------------------
NOTE: This  reconciliation  and tie shall not, for any purpose,  be deemed to be
part of the Trust Agreement.
<PAGE>
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                                Table of Contents

                                                                                                               Page

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ARTICLE 1   DEFINED TERMS.........................................................................................1
         SECTION 1.1  Definitions.................................................................................1

ARTICLE 2   ESTABLISHMENT OF THE TRUST............................................................................9
         SECTION 2.1  Name........................................................................................9
         SECTION 2.2  Principal Place of Business; Registered Agent...............................................9
         SECTION 2.3  Organizational Expenses....................................................................10
         SECTION 2.4  Issuance of the Preferred Securities.......................................................10
         SECTION 2.5  Subscription and Purchase of Debt Securities; Issuance of the Common Securities............10
         SECTION 2.6  Declaration of Trust.......................................................................11
         SECTION 2.7  Authorization to Enter into Certain Transactions...........................................11
         SECTION 2.8  Assets of Trust............................................................................15
         SECTION 2.9  Title to Trust Property....................................................................15

ARTICLE 3   PAYMENT ACCOUNT......................................................................................15
         SECTION 3.1  Payment Account............................................................................15

ARTICLE 4   DISTRIBUTIONS; REDEMPTION; EXCHANGE..................................................................16
         SECTION 4.1  Distributions..............................................................................16
         SECTION 4.2  Redemption.................................................................................16
         SECTION 4.3  Intentionally Omitted......................................................................19
         SECTION 4.4  Special Event Exchange or Redemption.......................................................19
         SECTION 4.5  Subordination of Common Securities.........................................................21
         SECTION 4.6  Payment Procedures.........................................................................22
         SECTION 4.7  Tax Returns and Reports....................................................................22
         SECTION 4.8  Payment of Taxes, Duties, Etc., of the Trust...............................................22
         SECTION 4.9  Payments under Indenture...................................................................22

ARTICLE 5         TRUST SECURITIES CERTIFICATES..................................................................22
         SECTION 5.1  Initial Ownership..........................................................................22
         SECTION 5.2  The Trust Securities Certificates..........................................................22
         SECTION 5.3  Delivery of Trust Securities Certificates..................................................23
         SECTION 5.4  Registration of Transfer and Exchange of Preferred Securities; Restrictions on Transfer....23
         SECTION 5.5  Mutilated, Destroyed, Lost or Stolen Trust Securities Certificates.........................24
         SECTION 5.6  Persons Deemed Securityholders.............................................................24
         SECTION 5.7  Access to List of Securityholders' Names and Addresses.....................................25
         SECTION 5.8  Maintenance of Office or Agency............................................................25
         SECTION 5.9  Appointment of Paying Agent................................................................25
         SECTION 5.10  Ownership of Common Securities by Sponsor.................................................26
         SECTION 5.11  Global Securities; Non-Global Securities; Common Securities Certificate...................26
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                                Table of Contents
                                   (continued)

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         SECTION 5.12  Notices to Clearing Agency................................................................27
         SECTION 5.13  Definitive Preferred Securities Certificates..............................................27
         SECTION 5.14  Rights of Securityholders.................................................................28

ARTICLE 6   ACT OF SECURITYHOLDERS; MEETINGS; VOTING.............................................................28
         SECTION 6.1  Limitations on Voting Rights...............................................................28
         SECTION 6.2  Notice of Meetings.........................................................................30
         SECTION 6.3  Meetings of Preferred Securityholders......................................................30
         SECTION 6.4  Voting Rights..............................................................................31
         SECTION 6.5  Proxies, Etc...............................................................................31
         SECTION 6.6  Securityholder Action by Written Consent...................................................31
         SECTION 6.7  Record Date for Voting and Other Purposes..................................................31
         SECTION 6.8  Acts of Securityholders....................................................................32
         SECTION 6.9  Inspection of Records......................................................................33

ARTICLE 7   REPRESENTATIONS AND WARRANTIES.......................................................................33
         SECTION 7.1  Representations and Warranties of the Property Trustee.....................................33
         SECTION 7.2  Representations and Warranties of Sponsor..................................................34

ARTICLE 8   THE TRUSTEES.........................................................................................34
         SECTION 8.1  Certain Duties and Responsibilities........................................................34
         SECTION 8.2  Notice of Defaults.........................................................................36
         SECTION 8.3  Certain Rights of Property Trustee.........................................................38
         SECTION 8.4  Not Responsible for Recitals or Issuance of Securities.....................................40
         SECTION 8.5  May Hold Securities........................................................................41
         SECTION 8.6  Compensation; Indemnity; Fees..............................................................41
         SECTION 8.7  Property Trustee Required; Eligibility of Trustees.........................................42
         SECTION 8.8  Conflicting Interests......................................................................42
         SECTION 8.9  Resignation and Removal; Appointment of Successor..........................................42
         SECTION 8.10  Acceptance of Appointment by Successor....................................................43
         SECTION 8.11  Merger, Conversion, Consolidation or Succession to Business...............................44
         SECTION 8.12  Preferential Collection of Claims Against Sponsor or Trust................................44
         SECTION 8.13  Reports by Property Trustee...............................................................44
         SECTION 8.14  Reports to the Property Trustee...........................................................44
         SECTION 8.15  Evidence of Compliance with Conditions Precedent..........................................45
         SECTION 8.16  Number of Trustees........................................................................45
         SECTION 8.17  Delegation of Power.......................................................................45

ARTICLE 9   DISSOLUTION, LIQUIDATION AND MERGER..................................................................45
         SECTION 9.1  Dissolution upon Expiration Date...........................................................45
         SECTION 9.2  Early Dissolution..........................................................................46
         SECTION 9.3  Dissolution................................................................................46
         SECTION 9.4  Liquidation................................................................................46
         SECTION 9.5  Mergers, Consolidations or Replacements of the Trust.......................................48
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                                      (ii)
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                                Table of Contents
                                   (continued)

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ARTICLE 10  MISCELLANEOUS PROVISIONS.............................................................................49
         SECTION 10.1  Limitation of Rights of Securityholders...................................................49
         SECTION 10.2  Amendment.................................................................................49
         SECTION 10.3  Separability..............................................................................50
         SECTION 10.4  Governing Law.............................................................................50
         SECTION 10.5  Payments Due on Non-Business Day..........................................................50
         SECTION 10.6  Successors................................................................................50
         SECTION 10.7  Headings..................................................................................51
         SECTION 10.8  Reports, Notices and Demands..............................................................51
         SECTION 10.9  Agreement Not to Petition.................................................................51
         SECTION 10.10  Trust Indenture Act; Conflict with Trust Indenture Act...................................51
         SECTION 10.11  Acceptance of Terms of Trust Agreement, Guarantee and Indenture..........................52
         SECTION 10.12  Counterparts.............................................................................52

EXHIBIT A - Certificate of Trust of SNH Capital Trust I

EXHIBIT B - Form of Common Securities of SNH Capital Trust I

EXHIBIT C - Form of Preferred Securities of SNH Capital Trust I
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                                     (iii)

<PAGE>

         AMENDED AND RESTATED TRUST  AGREEMENT,  dated as of June 21, 2001 among
(i) SNH  CAPITAL  TRUST  HOLDINGS,  a Maryland  business  trust  (including  any
successors or assigns, the "Sponsor"), (ii) State Street Bank and Trust Company,
a  Massachusetts  trust  company,  as property  trustee (in such  capacity,  the
"Property  Trustee"  and, in its  personal  capacity  and not in its capacity as
Property Trustee, the "Bank"), (iii) Gerard M. Martin, an individual,  and Barry
M.  Portnoy,  an  individual,  each  of  whose  address  is c/o  Senior  Housing
Properties  Trust,  400 Centre Street,  Newton,  Massachusetts  02458 (each,  an
"Regular Trustee" and,  collectively,  the "Regular Trustees" and,  collectively
with the  Property  Trustee,  the  "Trustees")  and (iv) the several  Holders as
hereinafter defined.

                              W I T N E S S E T H:

         WHEREAS,  the Sponsor and certain of the Trustees have  heretofore duly
declared and created a business  trust  pursuant to the Maryland  Business Trust
Act by the entering into of that certain  Declaration of Trust,  dated as of May
4, 2001 (the  "Original  Trust  Agreement"),  and by the execution and filing by
certain of the Trustees with the State Department of Assessments and Taxation of
Maryland of the Certificate of Trust, filed on May 4, 2001,  attached as Exhibit
A, for the sole purpose of issuing and selling certain  securities  representing
undivided  beneficial  interests in the assets of the Trust (as defined  herein)
and investing the proceeds  thereof in the Debt Securities (as defined  herein);
and

         WHEREAS,  the parties  hereto  desire to amend and restate the Original
Trust  Agreement in its entirety as set forth herein to provide for, among other
things,  (i) the issuance and sale of the Common  Securities (as defined herein)
by the  Trust to the  Sponsor,  (ii)  the  issuance  and  sale of the  Preferred
Securities  (as  defined  herein)  by the  Trust  pursuant  to the  Underwriting
Agreement (as defined  herein) and (iii) the  acquisition  by the Trust from the
Parent of all of the right, title and interest in the Debt Securities;

         NOW, THEREFORE,  in consideration of the agreements and obligations set
forth herein and for other good and valuable  consideration,  the sufficiency of
which is hereby  acknowledged,  each party, for the benefit of the other parties
and for the benefit of the Holders of the  Preferred  Securities,  hereby amends
and restates the Original Trust Agreement in its entirety and agrees as follows:

                                   ARTICLE 1
                                  DEFINED TERMS

         SECTION 1.1  Definitions.  For all  purposes  of this Trust  Agreement,
except as otherwise expressly provided or unless the context otherwise requires:

         (a) the terms  defined in this Article  have the  meanings  assigned to
them in this Article and include the plural as well as the singular;

         (b) all other terms used herein that are defined in the Trust Indenture
Act, either directly or by reference therein, have the meanings assigned to them
therein;

<PAGE>

         (c)  unless  the  context  otherwise  requires,  any  reference  to  an
"Article" or a "Section" refers to an Article or a Section,  as the case may be,
of this Trust Agreement; and

         (d) the words  "herein,"  "hereof" and  "hereunder"  and other words of
similar  import  refer  to  this  Trust  Agreement  as a  whole  and  not to any
particular Article, Section or other subdivision.

         "Act" has the meaning specified in Section 6.8.

         "Additional  Amount" means, with respect to the Trust  Securities,  the
amount of Additional Interest (as defined in the Indenture), if any, paid by the
Parent on the Debt Securities.

         "Additional  Sums"  means,  with respect to the Trust  Securities,  the
amount of  Additional  Sums (as defined in the  Indenture),  if any, paid by the
Parent on the Debt Securities.

         "Affiliate" of any specified  Person means any other Person directly or
indirectly  controlling  or  controlled  by or under  direct or indirect  common
control with such specified Person,  provided,  however that an Affiliate of the
Sponsor or the Parent shall be deemed not to include the Trust. For the purposes
of this  definition,  "control"  when used with respect to any specified  Person
means the power to direct the management  and policies of such Person,  directly
or indirectly,  whether through the ownership of voting securities,  by contract
or  otherwise;  and the  terms  "controlling"  and  "controlled"  have  meanings
correlative to the foregoing.

         "Applicable   Procedures"  means,  with  respect  to  any  transfer  or
transaction  involving a Global Certificate or beneficial interest therein,  the
rules and procedures of the Euroclear  system, of Clearstream  Banking,  societe
anonyme (or its  successor),  and of the Clearing  Agency for such security,  in
each case to the extent  applicable  to such  transaction  and as in effect from
time to time.

         "Bank"  has  the  meaning  specified  in the  preamble  to  this  Trust
Agreement.

         "Bankruptcy Event" means, with respect to any Person:

                  (a) such  Person,  pursuant  to or within  the  meaning of any
         Bankruptcy  Law (i)  commences a voluntary  case,  (ii) consents to the
         entry of an order for relief  against  it in an  involuntary  case,  or
         (iii)  consents to the  appointment  of a Custodian of it or for all or
         substantially all of its property, or

                  (b) a court  of  competent  jurisdiction  enters  an  order or
         decree under any  Bankruptcy  Law that:  (i) is for relief against such
         Person in an involuntary case, (ii) appoints a Custodian of such Person
         or for all or  substantially  all of its property,  or (iii) orders the
         liquidation of such Person,  and the order or decree  remains  unstayed
         and in effect for 90 days.

         "Bankruptcy  Laws" means Title 11,  United  States  Bankruptcy  Code of
1978, as amended,  or any similar United States federal or state law relating to
bankruptcy, insolvency,

                                       2
<PAGE>

receivership,  winding-up,  liquidation,  reorganization or relief of debtors or
any amendment to, succession to or change in any such law.

         "Board of  Trustees"  means either the board of trustees of the Sponsor
or any committee of that board duly authorized to act hereunder.

         "Book-Entry  Preferred  Securities  Certificates"  means  a  beneficial
interest in the Preferred  Securities  Certificates,  ownership and transfers of
which shall be made through  book  entries by a Clearing  Agency as described in
Section 5.11.

         "Business  Day" means any day other than a Saturday  or Sunday or a day
on which banking institutions in New York, New York or in Boston,  Massachusetts
are  authorized or required by law or executive  order to remain closed or a day
on which the  Corporate  Trust Office of the Property  Trustee or the  corporate
trust office of the Indenture Trustee, is closed for business.

         "Clearing  Agency"  means an  organization  registered  as a  "clearing
agency"  pursuant  to Section 17A of the  Securities  Exchange  Act of 1934,  as
amended. The Depository Trust Company will be the initial Clearing Agency.

         "Clearing  Agency  Participant"  means a broker,  dealer,  bank,  other
financial  institution  or other  Person  for whom from time to time a  Clearing
Agency effects book-entry transfers and pledges of securities deposited with the
Clearing Agency.

         "Closing  Date"  means the first Time of  Delivery  (as  defined in the
Underwriting  Agreement),  which date is also the date of execution and delivery
of this Trust Agreement.

         "Commission" means the Securities and Exchange Commission, as from time
to time  constituted,  created  under the  Securities  Exchange Act of 1934,  as
amended,  or,  if at any  time  after  the  execution  of this  instrument  such
Commission  is not existing and  performing  the duties now assigned to it under
the Trust Indenture Act, then the body performing such duties at such time.

         "Common  Securities   Certificate"   means  a  certificate   evidencing
ownership of Common Securities, substantially in the form attached as Exhibit B.

         "Common Security" means an undivided  beneficial interest in the assets
of the Trust,  having a  Liquidation  Amount  with  respect to the assets of the
Trust of $25.00 and having the rights provided therefor in this Trust Agreement,
including the right to receive  Distributions and a Liquidation  Distribution as
provided herein.

         "Common  Stock" means common  shares of beneficial  interest,  $.01 par
value per share, of the Parent.

         "Corporate Trust Office" means the principal  corporate trust office of
the  Property  Trustee  at which at any  particular  time  its  corporate  trust
business  shall be  administered,  which office at the date hereof is located at
Boston, Massachusetts, Attention: Paul D. Allen.

                                       3
<PAGE>

         "Debt  Security  Redemption  Date"  means,  with  respect  to any  Debt
Securities to be redeemed  under the  Indenture,  the date fixed for  redemption
thereof under the Indenture.

         "Debt Securities" means up to $29,639,200 aggregate principal amount of
10.125%  Junior  Subordinated  Debentures of the Parent  issued  pursuant to the
Indenture.

         "Definitive Preferred Securities Certificates" means either or both (as
the  context  requires)  of (x)  Preferred  Securities  Certificates  issued  in
certificated,  fully  registered  form as  provided  in Section  5.11(b) and (y)
Preferred Securities Certificates issued in certificated,  fully registered form
as provided in Section 5.13.

         "Direct Action" has the meaning specified in Section 6.8.

         "Distribution Date" has the meaning specified in Section 4.1(a).

         "Distributions"   means  amounts   payable  in  respect  of  the  Trust
Securities as provided in Section 4.1.

         "Early Dissolution Event" has the meaning specified in Section 9.2.

         "Event  of  Default"  means the  occurrence  of an  Indenture  Event of
Default,  whatever the reason for such Indenture Event of Default and whether it
shall be voluntary or involuntary or be effected by operation of law or pursuant
to any judgment,  decree or order of any court or any order,  rule or regulation
of any administrative or governmental body.

         "Exchange Agent" means any exchange agent appointed pursuant to Section
4.4(h).

         "Exchange Notice" has the meaning specified in Section 4.4(b).

         "Expiration Date" has the meaning specified in Section 9.1.

         "Global  Certificate"  means a Preferred Security that is registered in
the Securities Register in the name of a Clearing Agency or a nominee thereof.

         "Guarantee" means the Guarantee Agreement executed and delivered by the
Parent and State Street Bank and Trust Company,  a Massachusetts  trust company,
as guarantee trustee,  contemporaneously with the execution and delivery of this
Trust Agreement, for the benefit of the Holders of the Preferred Securities,  as
amended from time to time.

         "Holder"  means a Person in whose name a Trust  Securities  Certificate
representing  a Trust  Security is  registered,  such Person  being a beneficial
owner within the meaning of the Maryland Business Trust Act.

         "Indenture" means the Junior Subordinated  Indenture,  dated as of June
21, 2001, between the Parent and the Indenture  Trustee,  as supplemented by the
Supplemental Indenture No. 1 thereto, dated as of June 21, 2001, as the same may
be amended or supplemented from time to time.

                                       4
<PAGE>

         "Indenture  Event of Default" means an "Event of Default" as defined in
the Indenture.

         "Indenture  Trustee"  means  State  Street  Bank and Trust  Company,  a
Massachusetts trust company, as trustee under the Indenture.

         "Investment  Company Event" means the receipt by the Property  Trustee,
on behalf of the Trust, of an Opinion of Counsel,  rendered by a law firm having
a national tax and securities  practice (which Opinion of Counsel shall not have
been  rescinded  by such law  firm),  to the  effect  that,  as a result  of the
occurrence  of a change in law or regulation  or a change in  interpretation  or
application of law or regulation by any legislative  body,  court,  governmental
agency or regulatory  authority (a "Change in 1940 Act Law"), there is more than
an  insubstantial  risk that the Trust is or will be considered  an  "investment
company" that is required to be registered  under the 1940 Act,  which Change in
1940 Act Law becomes  effective on or after the date of original issuance of the
Preferred Securities under this Trust Agreement.

         "Lien" means any lien, pledge, charge,  encumbrance,  mortgage, deed of
trust, adverse ownership interest, hypothecation,  assignment, security interest
or preference,  priority or other security agreement or preferential arrangement
of any kind or nature whatsoever.

         "Liquidation  Amount" means an amount with respect to the assets of the
Trust equal to $25.00 per Trust Security.

         "Liquidation Date" means each date on which Debt Securities or cash are
to  be  distributed  to  Holders  of  Trust  Securities  in  connection  with  a
dissolution and liquidation of the Trust pursuant to Section 9.4(a).

         "Liquidation Distribution" has the meaning specified in Section 9.4(d).

         "Maryland  Business Trust Act" means Title 12 of the  Corporations  and
Associations  Article of the  Annotated  Code of Maryland,  as it may be amended
from time to time.

         "1940 Act" means the Investment Company Act of 1940, as amended.

         "Officers'  Certificate"  means a certificate signed by the Chairman of
the Board, a Trustee, a Vice Chairman of the Board, the Chief Executive Officer,
the Chief Operating  Officer,  the Chief Financial  Officer,  the President or a
Vice President,  and, by the Treasurer, an Assistant Treasurer,  the Controller,
the Secretary or an Assistant  Secretary,  of the Sponsor,  and delivered to the
Property Trustee. Any Officers' Certificate delivered with respect to compliance
with a condition or covenant provided for in this Trust Agreement shall include:

                  (a) a  statement  that  each  officer  signing  the  Officers'
         Certificate  has read the  covenant or  condition  and the  definitions
         relating  thereto;  a brief  statement  of the  nature and scope of the
         examination  or  investigation  undertaken by each officer in rendering
         the Officers' Certificate;

                  (b) a statement that each officer has made such examination or
         investigation  as, in such  officer's  opinion,  is necessary to enable
         such  officer to express an informed  opinion as to whether or not such
         covenant or condition has been complied with; and

                                       5
<PAGE>

                  (c) a  statement  as to  whether,  in the opinion of each such
         officer, such condition or covenant has been complied with.

         "Opinion of  Counsel"  means a written  opinion of counsel,  who may be
counsel for the Trust,  the Property  Trustee or the Sponsor,  and who may be an
employee of any thereof, and who shall be acceptable to the Property Trustee.

         "Optional  Redemption  Price"  means  with  respect  to  the  Preferred
Securities  (except as set forth  below  with  respect  to  redemption  upon the
occurrence  of a Tax  Event),  100% of the  Liquidation  Amounts  thereof,  plus
accumulated and unpaid  Distributions,  if any, to the date fixed for redemption
if redeemed during the twelve-month  period  commencing June 15 of each year. In
the event of a  redemption  of Trust  Securities  upon the  occurrence  of a Tax
Event,  Trust Securities shall be redeemed at the redemption price of $25.00 per
Trust Security and all accumulated and unpaid Distributions, if any, to the date
fixed for redemption.

         "Original Trust Agreement" has the meaning specified in the recitals to
this Trust Agreement.

         "Outstanding", when used with respect to Trust Securities, means, as of
the  date of  determination,  all  Trust  Securities  theretofore  executed  and
delivered under this Trust Agreement, except:

                  (a) Trust Securities  theretofore  cancelled by the Securities
         Registrar or delivered to the Securities  Registrar for cancellation or
         tendered for conversion;

                  (b) Trust  Securities for whose payment or redemption money in
         the necessary amount has been  theretofore  deposited with the Property
         Trustee or any Paying  Agent for the Holders of such Trust  Securities;
         provided that, if such Trust  Securities are to be redeemed,  notice of
         such redemption has been duly given pursuant to this Trust Agreement;

                  (c)  Trust  Securities  which  have  been  exchanged  for Debt
         Securities pursuant to Section 4.4; and

                  (d) Trust  Securities  which have been paid or in exchange for
         or in lieu of which  other  Trust  Securities  have been  executed  and
         delivered pursuant to Section 5.5;

provided,  however,  that in  determining  whether the Holders of the  requisite
Liquidation  Amount of the Outstanding  Trust Securities have given any request,
demand,  authorization,  direction,  notice, consent or waiver hereunder,  Trust
Securities owned by the Sponsor,  any Trustee or any Affiliate of the Sponsor or
any Trustee shall be disregarded and deemed not to be  Outstanding,  except that
(a) in determining  whether any Trustee shall be fully protected in relying upon
any such request, demand,  authorization,  direction, notice, consent or waiver,
only Trust Securities that a Responsible  Officer of the Property Trustee, or an
individual  Regular  Trustee,  as the case may be, actually knows to be so owned
shall be so disregarded  and (b) the foregoing  shall not apply at any time when
all of the Outstanding Trust Securities are owned by the Sponsor, one or more of
the Regular Trustees and/or any such Affiliate.  Trust Securities so owned which
have been  pledged in good faith may be regarded as  Outstanding  if the pledgee
establishes to the

                                       6
<PAGE>

satisfaction  of the  Securities  Registrar the  pledgee's  right so to act with
respect to such Trust  Securities and that the pledgee is not the Sponsor or any
Affiliate of the Sponsor.

         "Owner" means each Person who is the  beneficial  owner of a Book-Entry
Preferred  Securities  Certificate  as  reflected in the records of the Clearing
Agency or, if a Clearing Agency  Participant is not the Owner, then as reflected
in the records of a Person  maintaining  an account  with such  Clearing  Agency
(directly or indirectly, in accordance with the rules of such Clearing Agency).

         "Parent" means Senior Housing  Properties Trust, a Maryland real estate
investment trust and its successors and assigns.

         "Paying  Agent"  means any paying agent or  co-paying  agent  appointed
pursuant to Section 5.9.

         "Payment  Account" means a segregated  non-interest  bearing  corporate
trust  account  maintained  by the  Property  Trustee with the Bank in its trust
department for the benefit of the  Securityholders  in which all amounts paid in
respect of the Debt Securities will be held and from which the Property  Trustee
shall make payments to the Securityholders in accordance with Section 4.1.

         "Person" means any individual, corporation, partnership, joint venture,
association,   joint  stock  company,   trust,   limited  liability  company  or
corporation,   unincorporated  organization  or  government  or  any  agency  or
political subdivision thereof.

         "Preferred  Securities  Certificate"  means  a  certificate  evidencing
ownership of Preferred Securities, substantially in the form attached as Exhibit
C.

         "Preferred  Security"  means an  undivided  beneficial  interest in the
assets of the Trust,  having a Liquidation  Amount with respect to the assets of
the Trust of $25.00  and  having  the  rights  provided  therefor  in this Trust
Agreement,  including  the  right to  receive  Distributions  and a  Liquidation
Distribution as provided herein.

         "Property   Trustee"  means  the  commercial   bank  or  trust  company
identified  as the  "Property  Trustee" in the preamble to this Trust  Agreement
solely  in its  capacity  as  Property  Trustee  of  the  Trust  and  not in its
individual  capacity,  or its  successor  in interest in such  capacity,  or any
successor property trustee appointed as herein provided.

         "Redemption  Date"  means,  with  respect to any Trust  Security  to be
redeemed, each Debt Security Redemption Date.

         "Redemption  Price" means,  with respect to any Trust Security,  $25.00
per Trust Security,  plus  accumulated and unpaid  Distributions  (including any
Additional Sums) to the date of redemption.

         "Regular  Trustee" means each individual  named as a Regular Trustee in
the  preamble to this Trust  Agreement,  each solely in his  capacity as Regular
Trustee  of the  Trust  and not in his  individual  capacity,  or  such  Regular
Trustee's  successor in interest in such capacity,  or any

                                       7
<PAGE>

successor  in  interest  in such  capacity,  or any  successor  Regular  Trustee
appointed as herein provided.

         "Relevant Trustee" has the meaning specified in Section 8.9.

         "Responsible  Officer" when used with respect to the Property  Trustee,
means the chairman or any vice-chairman of the board of directors,  the chairman
or any vice-chairman of the executive  committee of the board of directors,  the
chairman  of the  trust  committee,  the  president,  any  vice  president,  the
secretary,  any assistant secretary, the treasurer, any assistant treasurer, the
cashier,  any assistant  cashier,  any trust officer or assistant trust officer,
the controller or any assistant  controller or any other officer of the Property
Trustee  customarily  performing  functions similar to those performed by any of
the above  designated  officers  and also means,  with  respect to a  particular
corporate  trust  matter,  any other  officer  to whom such  matter is  referred
because of his knowledge of and familiarity with the particular subject.

         "Securities  Register" and  "Securities  Registrar" have the respective
meanings specified in Section 5.4.

         "Securityholder"  or  "Holder"  means a Person  in  whose  name a Trust
Security or Securities is registered in the Securities Register; any such Person
shall be deemed to be a  beneficial  owner  within the  meaning of the  Maryland
Business Trust Act.

         "Special Event" means a Tax Event or an Investment Company Event.

         "Sponsor"  has the  meaning  specified  in the  preamble  to this Trust
Agreement.

         "Sponsor Indemnified Person" has the meaning specified in Section 8.6.

         "Successor Property Trustee" has the meaning specified in Section 8.9.

         "Successor Securities" has the meaning specified in Section 9.5.

         "Super Majority" has the meaning specified in Section 8.2.

         "Tax Event" means the receipt by the Property Trustee, on behalf of the
Trust,  of an Opinion of Counsel,  rendered by a law firm having a national  tax
and securities  practice (which Opinion of Counsel shall not have been rescinded
by such law  firm),  to the effect  that,  as a result of any  amendment  to, or
change  (including  any  announced  prospective  change)  in,  the  laws (or any
regulations  thereunder)  of the United States or any political  subdivision  or
taxing authority  thereof or therein affecting  taxation,  or as a result of any
official  administrative  pronouncement  or judicial  decision  interpreting  or
applying  such laws or  regulations,  which  amendment or change is effective or
such  pronouncement or decision is announced on or after the date of issuance of
the Preferred  Securities under this Trust Agreement and does not pertain to the
use of the proceeds of the issuance of the Debt  Securities,  there is more than
an insubstantial risk in each case after the date thereof that (i) the Trust is,
or will be  within 90 days  after the date  thereof,  subject  to United  States
federal  income  tax with  respect  to income  received  or  accrued on the Debt
Securities,  (ii) interest  payable by the Parent on the Debt Securities is not,
or will not be, within 90 days after the date thereof,  deductible,  in whole or
in part, for United States federal

                                       8
<PAGE>

income tax  purposes  or (iii) the Trust is, or will be within 90 days after the
date  thereof,  subject to more than de minimus  amount of other taxes,  duties,
assessments or other governmental charges.

         "Trust"  means  the  Maryland   business  trust  continued  hereby  and
identified on the cover page of this Trust Agreement.

         "Trust  Agreement" means this Amended and Restated Trust Agreement,  as
the same  may be  modified,  amended  or  supplemented  in  accordance  with the
applicable provisions hereof, including all exhibits hereto,  including, for all
purposes  of this  Trust  Agreement  and any  such  modification,  amendment  or
supplement,  the  provisions of the Trust  Indenture Act that are deemed to be a
part of and govern this Trust Agreement and any such modification,  amendment or
supplement, respectively.

         "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force
at the date as of which this instrument was executed; provided, however, that in
the event the Trust  Indenture  Act of 1939 is amended  after such date,  "Trust
Indenture Act" means, to the extent  required by any such  amendment,  the Trust
Indenture Act of 1939 as so amended.

         "Trust Property" means (a) the Debt Securities, (b) any cash on deposit
in, or owing to, the Payment  Account and (c) all proceeds and rights in respect
of the  foregoing  to be held by the Property  Trustee  pursuant to the terms of
this Trust Agreement for the benefit of the Securityholders.

         "Trust  Security"  means  any  one  of  the  Common  Securities  or the
Preferred Securities.

         "Trust Securities  Certificate"  means any one of the Common Securities
Certificates,  the Global  Certificates or the Definitive  Preferred  Securities
Certificates.

         "Trustees"  means,  collectively,  the Property Trustee and the Regular
Trustees.

         "Underwriting Agreement" means the Underwriting Agreement,  dated as of
June 18, 2001, among the Parent,  the Sponsor and UBS Warburg LLC, Salomon Smith
Barney Inc., A.G. Edwards & Sons, Inc., First Union Securities, Inc., Prudential
Securities  Incorporated,  Credit  Suisse  First Boston  Corporation  and Tucker
Anthony Incorporated, as representatives of the several underwriters.

                                   ARTICLE 2
                           ESTABLISHMENT OF THE TRUST

         SECTION 2.1 Name.  The Trust  continued  hereby  shall be known as "SNH
Capital  Trust I, as such name may be modified  from time to time by the Regular
Trustees  following  written  notice to the Holders of Trust  Securities and the
other  Trustees,  in which name the  Trustees  may conduct  the  business of the
Trust,  make and execute  contracts and other instruments on behalf of the Trust
and sue and be sued.

         SECTION 2.2 Principal Place of Business; Registered Agent.

                                       9
<PAGE>

         (a) The  address  of the  principal  office of the Trust is c/o  Senior
Housing Properties Trust, 400 Centre Street, Newton, Massachusetts 02458 or such
other  address as the Regular  Trustees may  designate by written  notice to the
Sponsor.  The address of the Maryland  office of the Trust is c/o Ballard  Spahr
Andrews & Ingersoll, LLP, 300 East Lombard Street, Baltimore,  Maryland 21202 or
such other address as the Regular  Trustees may  designate by written  notice to
the Sponsor.

         (b) The  name of the  resident  agent  of the  Trust  in the  State  of
Maryland is James J. Hanks,  Jr., 300 East Lombard Street,  Baltimore,  Maryland
21202.  The resident agent is a citizen of and resides in the State of Maryland.
At any time, the Regular Trustees may designate by written notice to the Sponsor
another  resident agent who is a citizen of and resides in the State of Maryland
or which is a Maryland corporation.

         SECTION   2.3   Organizational   Expenses.   The   Sponsor   shall  pay
organizational expenses of the Trust as they arise or shall, upon request of any
Trustee,  promptly  reimburse  such Trustee for any such  expenses  paid by such
Trustee. The Sponsor shall make no claim upon the Trust Property for the payment
of such expenses.

         SECTION 2.4 Issuance of the Preferred Securities. On June 18, 2001, the
Sponsor  and the  Trust  executed  and  delivered  the  Underwriting  Agreement.
Contemporaneously  with the  execution and delivery of this Trust  Agreement,  a
Regular  Trustee,  on behalf of the  Trust,  shall  execute in  accordance  with
Section 5.2 and deliver to the Underwriters named in the Underwriting  Agreement
Preferred Securities Certificates, in an aggregate amount of 1,000,000 Preferred
Securities  having  an  aggregate  Liquidation  Amount of  $25,000,000,  against
receipt  of the  aggregate  purchase  price  of  such  Preferred  Securities  of
$25,000,000,  which amount the Regular Trustees shall promptly deliver, or cause
to be delivered,  to the Property  Trustee.  If the Underwriters  exercise their
over-allotment option granted pursuant to the Underwriting Agreement,  then upon
exercise  of the  over-allotment  option  in  accordance  with the  terms of the
Underwriting Agreement, a Regular Trustee, on behalf of the Trust, shall execute
in  accordance  with  Section 5.2 and deliver to the  Underwriters  named in the
Underwriting Agreement Preferred Securities Certificates, in an aggregate amount
of up to 150,000 additional Preferred Securities having an aggregate Liquidation
Amount of $3,750,000,  against  receipt of the aggregate  purchase price of such
Preferred  Securities  of up to  $3,750,000,  which amount the Regular  Trustees
shall promptly deliver, or cause to be delivered, to the Property Trustee

         SECTION 2.5 Subscription  and Purchase of Debt Securities;  Issuance of
the Common Securities. Contemporaneously with the execution and delivery of this
Trust Agreement,  the Regular Trustees,  on behalf of the Trust, shall subscribe
to and purchase from the Parent Debt  Securities,  registered in the name of the
Property  Trustee (in its  capacity as such) and having an  aggregate  principal
amount equal to $25,773,200, and, in satisfaction of the purchase price for such
Debt Securities,  the Property Trustee, on behalf of the Trust, shall deliver to
the  Parent  the sum of  $25,773,200.  Contemporaneously  therewith,  a  Regular
Trustee,  on behalf of the Trust,  shall execute in accordance  with Section 5.2
and deliver to the Sponsor Common Securities Certificates registered in the name
of the Sponsor,  in an aggregate  amount of 4,640  Common  Securities  having an
aggregate Liquidation Amount of $116,000 against receipt by the Property Trustee
of the aggregate  purchase price of such Common  Securities  from the Sponsor of
the sum of $116,000.  If the Underwriters  exercise their over-allotment  option
granted  pursuant  to the

                                       10
<PAGE>

Underwriting  Agreement,  then upon  exercise  of the  over-allotment  option in
accordance with the terms of the Underwriting  Agreement,  the Regular Trustees,
on behalf of the Trust,  shall  subscribe to and  purchase  from the Parent Debt
Securities,  registered in the name of the Property  Trustee (in its capacity as
such) and having an  aggregate  principal  amount of up to  $3,866,000  and,  in
satisfaction  of the  purchase  price for such  Debt  Securities,  the  Property
Trustee,  on behalf of the Trust,  shall  deliver to the Parent the sum of up to
$3,866,000.  Contemporaneously  therewith,  a Regular Trustee,  on behalf of the
Trust,  shall execute in accordance  with Section 5.2 and deliver to the Sponsor
Common  Securities  Certificates  registered  in the name of the Sponsor,  in an
aggregate amount of up to 4,640 additional Common Securities having an aggregate
Liquidation  Amount of up to $116,000 against receipt by the Property Trustee of
the aggregate  purchase price of such Common  Securities from the Sponsor of the
sum of up to $116,000.

         SECTION 2.6 Declaration of Trust. The exclusive  purposes and functions
of the Trust are (a) to issue and sell  Trust  Securities  and use the  proceeds
from such sale to acquire the Debt  Securities,  (b) to  distribute  the Trust's
income as provided in this Trust Agreement and (c) to engage in only those other
activities  necessary or incidental  thereto.  The Trust shall not borrow money,
issue debt or reinvest proceeds derived from investments, mortgage or pledge any
of its assets or otherwise  undertake (or permit to be undertaken)  any activity
that would cause the Trust not to be classified for United States federal income
tax purposes as a grantor  trust.  The Sponsor  hereby  appoints the Trustees as
trustees of the Trust,  to have all the rights,  powers and duties to the extent
set forth herein,  and the Trustees hereby accept such  appointment,  subject to
the terms and conditions  hereof.  The Property  Trustee hereby declares that it
will hold the Trust  Property  in trust upon and subject to the  conditions  set
forth herein for the benefit of the Trust and the  Securityholders.  The Regular
Trustees  shall have all  rights,  powers  and  duties  set forth  herein and in
accordance with applicable law with respect to accomplishing the purposes of the
Trust.

         SECTION 2.7 Authorization to Enter into Certain Transactions.

         (a) The Trustees  shall  conduct the affairs of the Trust in accordance
with the terms of this Trust Agreement.  Subject to the limitations set forth in
Section  2.6 and  paragraph  (b) of this  Section,  and in  accordance  with the
following  provisions (i) and (ii), the Trustees shall have the exclusive power,
duty and the authority to cause the Trust to engage in the following activities:

                  (i) As among the Trustees, each Regular Trustee shall have the
         exclusive  power and  authority  to act on  behalf  of the  Trust  with
         respect to the following matters:

                           (A) to issue and sell the Trust Securities, provided,
                  however,  that the Trust may issue no more than one  series of
                  Preferred  Securities  and no more  than one  series of Common
                  Securities,  and,  provided,  further,  that there shall be no
                  interests  in the Trust other than the Trust  Securities,  and
                  the  issuance  of  Trust   Securities   shall  be  limited  to
                  simultaneous  issuance of both Preferred Securities and Common
                  Securities  on the Closing  Date and any other date  Preferred
                  Securities  and Common  Securities  are sold  pursuant  to the
                  over-allotment option granted to the Underwriters named in the
                  Underwriting  Agreement,  subject  to the

                                       11
<PAGE>

                  issuance  of Trust  Securities  pursuant  to  Section  5.5 and
                  Successor Securities pursuant to Section 9.5;

                           (B) to cause the Trust to enter into, and to execute,
                  deliver  and  perform  on behalf of the Trust,  a  certificate
                  depository  agreement  and  such  other  agreements  as may be
                  necessary  or  incidental  to the purposes and function of the
                  Trust;

                           (C) to assist in the  registration  of the  Preferred
                  Securities  under the Securities Act of 1933, as amended,  and
                  under state securities or blue sky laws, and the qualification
                  of this Trust  Agreement as a trust  indenture under the Trust
                  Indenture Act;

                           (D)  to  assist  in  the  listing  of  the  Preferred
                  Securities upon such securities exchange or exchanges, if any,
                  as shall be determined by the Sponsor and the  registration of
                  the Preferred  Securities under the Securities Exchange Act of
                  1934,  as  amended,  and the  preparation  and  filing  of all
                  periodic and other reports and other documents pursuant to the
                  foregoing   (only  to  the   extent   that  such   listing  or
                  registration is requested by the Sponsor);

                           (E) to appoint a Paying Agent, a Securities Registrar
                  and an  authenticating  agent in  accordance  with this  Trust
                  Agreement;

                           (F) to the extent and in the manner  provided in this
                  Trust  Agreement,  to wind up the affairs of and liquidate the
                  Trust  and to  prepare,  execute  and  file a  certificate  of
                  cancellation  with the State  Department  of  Assessments  and
                  Taxation in  accordance  with the  provisions  of the Maryland
                  Business Trust Act;

                           (G)  unless   otherwise   required  by  the  Maryland
                  Business  Trust Act or the Trust  Indenture Act, to execute on
                  behalf of the Trust (either  acting alone or together with any
                  other  Regular   Trustees)  any  documents  that  the  Regular
                  Trustees  have the power to  execute  pursuant  to this  Trust
                  Agreement;

                           (H) to take any action incidental to the foregoing as
                  the Trustees  may from time to time  determine is necessary or
                  advisable to give effect to the terms of this Trust  Agreement
                  including, but not limited to:

                           (i)      causing  the Trust not to be deemed to be an
                                    investment company required to be registered
                                    under the 1940 Act;

                           (ii)     causing  the  Trust  to  be  classified  for
                                    United States federal income tax purposes as
                                    a grantor trust; and

                           (iii)    cooperating  with the Sponsor to ensure that
                                    the  Debt  Securities  will  be  treated  as
                                    indebtedness of the Parent for United States
                                    federal income tax purposes;

                  provided  that such  action does not  adversely  affect in any
                  material  respect the

                                       12
<PAGE>

                  interests of  Securityholders  except as otherwise provided in
                  Section 10.2(a); and

                           (I) to execute all documents or instruments,  perform
                  all duties and powers,  and do all things for and on behalf of
                  the  Trust  in all  matters  necessary  or  incidental  to the
                  foregoing.

                  (ii) As among the  Trustees,  the Property  Trustee shall have
         the  power,  duty and  authority  to act on behalf  of the  Trust  with
         respect to the following matters:

                           (A) the establishment of the Payment Account;

                           (B) the  receipt  of and  taking  title  to the  Debt
                  Securities;

                           (C) the  collection  of interest,  principal  and any
                  other  payments made in respect of the Debt  Securities in the
                  Payment Account;

                           (D) the  distribution  from  the  Trust  Property  of
                  amounts  owed to the  Securityholders  in respect of the Trust
                  Securities;

                           (E) the  exercise  of all of the  rights,  powers and
                  privileges of a holder of the Debt Securities;

                           (F) the sending of notices of default,  other notices
                  and other  information  regarding the Trust Securities and the
                  Debt Securities to the Securityholders in accordance with this
                  Trust Agreement;

                           (G)  the   distribution  of  the  Trust  Property  in
                  accordance with the terms of this Trust Agreement;

                           (H) to the extent  provided in this Trust  Agreement,
                  the winding up of the affairs of and liquidation of the Trust;

                           (I) after an Event of Default of which a  Responsible
                  Officer of the Property  Trustee has knowledge,  the taking of
                  any action incidental to the foregoing as the Property Trustee
                  may from time to time  determine  is necessary or advisable to
                  give effect to the terms of this Trust  Agreement  and protect
                  and  conserve  the  Trust  Property  for  the  benefit  of the
                  Securityholders  (without  consideration  of the effect of any
                  such action on any particular Securityholder);

                           (J) subject to this Section 2.7(a)(ii),  the Property
                  Trustee shall have none of the duties, liabilities,  powers or
                  the  authority  of the Regular  Trustees  set forth in Section
                  2.7(a)(i);

                           (K)  to  act  as  Paying  Agent   and/or   Securities
                  Registrar to the extent appointed as such hereunder; and

                           (L)  the  taking  and   holding  of  title  to  Trust
                  Property.

                                       13
<PAGE>

         (b) So long as this Trust  Agreement  remains in effect,  the Trust (or
the Trustees  acting on behalf of the Trust) shall not  undertake  any business,
activities or transaction  except as expressly  provided  herein or contemplated
hereby. In particular,  notwithstanding  anything in this Trust Agreement to the
contrary,  the Trust shall not, and the  Trustees  shall not and shall not cause
the Trust to

                  (i) invest any proceeds received by the Trust from holding the
         Debt  Securities  (rather,  the  Trustees  shall  distribute  all  such
         proceeds  to the  Securityholders  pursuant  to the terms of this Trust
         Agreement and the Trust Securities),  acquire any investments or engage
         in any activities not  authorized by this Trust  Agreement,  (ii) sell,
         assign,  transfer,  exchange,  mortgage,  pledge,  set-off or otherwise
         dispose of any of the Trust Property or interests therein, including to
         Securityholders,  except as expressly  provided herein,  (iii) take any
         action  that  would  cause the Trust to fail or cease to  qualify  as a
         "grantor  trust" for United States  federal  income tax purposes,  (iv)
         make any loans or incur any  indebtedness  for borrowed  money or issue
         any other debt,  (v) take or consent to any action that would result in
         the placement of a Lien on any of the Trust Property,  (vi) possess any
         power or otherwise act in such a way as to vary the Trust assets or the
         terms of the Trust Securities in any way whatsoever except as permitted
         by the terms of this Trust Agreement,  or (vii) issue any securities or
         other evidences of beneficial  ownership of, or beneficial interest in,
         the Trust other than the Trust  Securities.  The Regular Trustees shall
         defend all claims and demands of all Persons at any time  claiming  any
         Lien on any of the Trust Property  adverse to the interest of the Trust
         or the Securityholders in their capacity as Securityholders.

         (c) In connection with the issue and sale of the Preferred  Securities,
the  Sponsor  shall have the right and  responsibility  to assist the Trust with
respect to, or effect on behalf of the Trust,  the  following  actions  (and any
actions taken by the Sponsor in furtherance  of the following  prior to the date
of this Trust Agreement are hereby ratified and confirmed in all respects):

                  (i) to file by the Trust with the Commission and to execute on
         behalf of the Trust a registration statement on the appropriate form in
         relation to the Preferred Securities, including any amendments thereto;

                  (ii) to  determine  the states and  foreign  jurisdictions  in
         which to take appropriate  action to qualify or register for resale all
         or part of the  Preferred  Securities  and to do any and all such acts,
         other  than  actions  which must be taken by or on behalf of the Trust,
         and advise  the  Trustees  of  actions  they must take on behalf of the
         Trust,  and  prepare  for  execution  and  filing any  documents  to be
         executed  and  filed by the Trust or on  behalf  of the  Trust,  as the
         Sponsor  deems  necessary  or  advisable  in order to  comply  with the
         applicable laws of any such states and foreign jurisdictions;

                  (iii) to the extent  necessary,  to prepare  for filing by the
         Trust  with the  Commission  and to  execute  on  behalf of the Trust a
         registration  statement on Form 8-A relating to the registration of the
         Preferred  Securities  under Section  12(b) or 12(g) of the  Securities
         Exchange Act of 1934, as amended,  including any amendments thereto (it
         being understood that neither the Trust, the Sponsor nor the Parent has
         any obligation

                                       14
<PAGE>

         under the Indenture,  the Underwriting Agreement or the Trust Agreement
         to register any Trust Securities  under the Securities  Exchange Act of
         1934, as amended,  or to list any Trust  Securities  on any  securities
         exchange);

                  (iv) to  negotiate,  and to execute and deliver,  on behalf of
         the Trust, the Underwriting Agreement; and

                  (v) any other actions necessary or incidental to carry out any
         of the foregoing activities.

                  (vi)  Notwithstanding  anything  herein to the  contrary,  the
         Regular  Trustees are authorized and directed to conduct the affairs of
         the Trust and to operate the Trust so that the Trust will not be deemed
         to be an "investment  company" required to be registered under the 1940
         Act, or taxed as a  corporation  for United States  federal  income tax
         purposes  and  so  that  the  Debt   Securities   will  be  treated  as
         indebtedness  of the  Parent  for  United  States  federal  income  tax
         purposes. In this connection,  the Sponsor and the Regular Trustees are
         authorized to take any action,  not  inconsistent  with applicable law,
         the  Certificate  of Trust or this  Trust  Agreement,  that each of the
         Sponsor and the Regular  Trustees  determines in their discretion to be
         necessary or desirable for such  purposes,  so long as such action does
         not  adversely  affect in any  material  respect the  interests  of the
         Holders of the  Preferred  Securities  except as otherwise  provided in
         Section 10.2(a).

         SECTION 2.8 Assets of Trust.  The assets of the Trust shall  consist of
only the Trust Property.

         SECTION 2.9 Title to Trust Property.  Legal title to all Trust Property
shall be vested at all times in the  Property  Trustee (in its capacity as such)
and shall be held and  administered  by the Property  Trustee for the benefit of
the Trust and the  Securityholders in accordance with this Trust Agreement.  The
Securityholders  shall  not have  legal  title to any part of the  assets of the
Trust,  but shall have an  undivided  beneficial  interest  in the assets of the
Trust.

                                   ARTICLE 3
                                 PAYMENT ACCOUNT

         SECTION 3.1 Payment Account.

         (a) On or  prior  to the  Closing  Date,  the  Property  Trustee  shall
establish  the  Payment  Account.  The  Property  Trustee  and any  agent of the
Property Trustee shall have exclusive  control and sole right of withdrawal with
respect  to the  Payment  Account  for the  purpose  of making  deposits  in and
withdrawals  from the Payment Account in accordance  with this Trust  Agreement.
All monies and other property deposited or held from time to time in the Payment
Account  shall be held by the  Property  Trustee in the Payment  Account for the
exclusive  benefit  of  the  Securityholders  and  for  distribution  as  herein
provided,  including  (and  subject to) any  priority of payments  provided  for
herein.

         (b) The Property Trustee shall deposit in the Payment Account, promptly
upon  receipt,  all  payments  of  principal  of or  interest  on, and any other
payments or proceeds with

                                       15
<PAGE>

respect to, the Debt  Securities.  Amounts held in the
Payment  Account  shall  not  be  invested  by  the  Property   Trustee  pending
distribution thereof.

                                   ARTICLE 4
                       DISTRIBUTIONS; REDEMPTION; EXCHANGE

         SECTION 4.1 Distributions.

         (a)  Distributions  on the Trust  Securities  shall be cumulative,  and
shall accrue from the date of original issuance, or the most recent Distribution
Date (as defined herein) and, except in the event that the Parent  exercises its
right to defer the payment of interest  on the Debt  Securities  pursuant to the
Indenture,  shall be payable  quarterly  in  arrears on each March 15,  June 15,
September 15 and  December 15 of each year,  commencing  on  September  15, 2001
(which dates correspond to the interest  payment dates on the Debt  Securities),
when,  as and if  available  for  payment by the  Property  Trustee,  as further
described  in  paragraph  (c)  of  this  Section  4.1.  If  any  date  on  which
Distributions  are otherwise  payable on the Trust  Securities is not a Business
Day, then the payment of such Distributions shall be made on the next succeeding
day which is a Business  Day (and no interest  shall  accrue for the period from
and after such date until the next succeeding  Business Day) with the same force
and effect as if made on such date (each date on which Distributions are payable
in accordance with this Section 4.1(a), a "Distribution Date").

         (b) The Trust Securities  represent undivided  beneficial  interests in
the Trust  Property,  and the  Distributions  on the Trust  Securities  shall be
payable at a rate of 10.125%  per annum of the  Liquidation  Amount of the Trust
Securities,  such rate being the rate of interest payable on the Debt Securities
to be held by the Property Trustee. The amount of Distributions  payable for any
period shall be computed on the basis of a 360-day year of twelve 30-day months.
For periods less than a full month, Distributions shall reflect interest on Debt
Securities  computed  on the basis of the  number  of  elapsed  days  based on a
360-day year of twelve 30-day months.  The amount of  Distributions  payable for
any period shall include the Additional Amounts, if any.

         (c) Distributions on the Trust Securities shall be made by the Property
Trustee from the Payment Account and shall be payable on each  Distribution Date
only to the extent  that the Trust has funds then on hand and  available  in the
Payment Account for the payment of such Distributions.

         (d)   Distributions   on  the  Trust   Securities  with  respect  to  a
Distribution  Date shall be payable to the Holders thereof as they appear on the
Securities  Register for the Trust Securities on the relevant record date, which
shall be the date which is one Business Day before such Distribution Date if the
Preferred  Securities  are in the  form  of a  Global  Certificate,  unless  the
Preferred Securities are no longer in the form of a Global Certificate, in which
case the relevant  record date with respect to a Distribution  Date shall be the
date which is 15 days before such  Distribution  Date (whether or not a Business
Day).

         SECTION 4.2 Redemption.

                                       16
<PAGE>

         (a) Upon an optional redemption (as set forth in the Indenture) of Debt
Securities,  the proceeds from such redemption  shall be applied to redeem Trust
Securities  having  an  aggregate  Liquidation  Amount  equal  to the  aggregate
principal  amount of the Debt  Securities  so redeemed by the Parent,  including
pursuant to Section 4.4, at the Optional  Redemption Price, and upon a mandatory
redemption (as set forth in the Indenture) of Debt Securities, the proceeds from
such redemption shall be applied to redeem Trust Securities, having an aggregate
Liquidation  Amount  equal  to  the  aggregate  principal  amount  of  the  Debt
Securities so redeemed by the Parent, at the Redemption Price. The Trust may not
redeem fewer than all the Outstanding  Trust  Securities  unless all accrued and
unpaid  Distributions  have been paid on all Trust  Securities for all quarterly
Distribution periods terminating on or prior to the date of redemption.

         (b) Notice of redemption  (which notice will be  irrevocable)  shall be
given by the Property Trustee by first-class mail,  postage prepaid,  mailed not
less than 30 nor more than 60 days prior to the  Redemption  Date to the Sponsor
and each Holder of Trust Securities to be redeemed,  at such Holder's address as
it appears in the Securities Register. All notices of redemption shall state:

                  (i) the Redemption Date;

                  (ii) the Redemption Price or the Optional Redemption Price, as
         the case may be;

                  (iii)  the  record  date  for  the  determination  of  Holders
         entitled  to  receive  payment  of the  Redemption  Price  or  Optional
         Redemption Price, as the case may be, as provided in Section 4.2(d);

                  (iv) the CUSIP number;

                  (v) if less than all of the Outstanding  Trust  Securities are
         to be redeemed, the identification and the aggregate Liquidation Amount
         of the particular Trust Securities to be redeemed; and

                  (vi) that on the Redemption  Date, the Redemption Price or the
         Optional  Redemption  Price,  as the case may be,  will  become due and
         payable  upon  each  such  Trust  Security  to  be  redeemed  and  that
         Distributions  thereon will cease to accrue on and after said date; and
         the place or places where such Trust  Securities  are to be surrendered
         for payment of the Redemption Price or the Optional  Redemption  Price,
         as the case may be.

         (c) The Trust  Securities  redeemed  on each  Redemption  Date shall be
redeemed at the Redemption Price or the Optional  Redemption  Price, as the case
may  be,  with  the  proceeds  from  the  contemporaneous   redemption  of  Debt
Securities. Redemptions of the Trust Securities shall be made and the Redemption
Price or the Optional  Redemption Price, as the case may be, shall be payable on
each  Redemption  Date only to the extent  that the Trust has funds then on hand
and available in the Payment Account for the payment of such Redemption Price or
the Optional Redemption Price, as the case may be.

                                       17
<PAGE>

         (d) If the Property  Trustee gives a notice of redemption in respect of
any  Preferred  Securities,  then,  by 12:00  noon,  New York City time,  on the
Redemption Date,  subject to Section 4.2(c),  the Property Trustee will, so long
as and to the extent  the  Preferred  Securities  are in  book-entry-only  form,
irrevocably deposit with the Clearing Agency for the Preferred  Securities funds
sufficient to pay the applicable  Redemption Price. If the Preferred  Securities
are no longer in book-entry only form, the Property Trustee,  subject to Section
4.2(c),  will irrevocably  deposit with the Paying Agent funds sufficient to pay
the applicable  Redemption Price or Optional  Redemption  Price, as the case may
be, on such Preferred  Securities  held in  certificated  form and will give the
Paying Agent irrevocable  instructions and authority to pay the Redemption Price
or the Optional  Redemption  Price,  as the case may be, to the Holders  thereof
upon surrender of their Preferred Securities  Certificates.  Notwithstanding the
foregoing,  Distributions  payable  on or prior to the  Redemption  Date for any
Trust  Securities  called for redemption shall be payable to the Holders of such
Trust  Securities  as they  appear  on the  Securities  Register  for the  Trust
Securities on the relevant record dates for the related  Distribution  Dates. If
notice of  redemption  shall have been given and funds  deposited  as  required,
then, upon the date of such deposit, all rights of Securityholders holding Trust
Securities  so  called  for  redemption  will  cease,  except  the right of such
Securityholders  to receive  the  Redemption  Price or the  Optional  Redemption
Price, as the case may be, but without interest;  and such Trust Securities will
cease to be  Outstanding.  In the event  that any date on which  any  Redemption
Price or the Optional  Redemption Price, as the case may be, is payable is not a
Business Day, then payment of the  Redemption  Price or the Optional  Redemption
Price,  as the  case  may be,  payable  on such  date  will be made on the  next
succeeding  day which is a  Business  Day (and  without  any  interest  or other
payment  in respect of any such  delay),  in each case,  with the same force and
effect as if made on such date.  Payment of the Redemption Price or the Optional
Redemption Price, as the case may be, shall be made to the Holders of such Trust
Securities as they appear on the Securities Register for the Trust Securities on
the relevant record date, which for so long as the Preferred  Securities  remain
in book-entry  form only shall be the date which is one Business Day before such
Redemption  Date. If the Preferred  Securities are no longer in book-entry  form
only, the relevant record date shall be the fifteenth day before such Redemption
Date (whether or not a Business Day).

         (e) If  less  than  all  the  Outstanding  Trust  Securities  are to be
redeemed on a Redemption  Date, then the aggregate  Liquidation  Amount of Trust
Securities  to be  redeemed  shall be  allocated  on a pro rata basis  (based on
Liquidation  Amounts) among the Common  Securities and the Preferred  Securities
that are to be redeemed.  The  particular  Preferred  Securities  to be redeemed
shall be  selected  not more than 60 days  prior to the  Redemption  Date by the
Property Trustee from the Outstanding Preferred Securities not previously called
for  redemption,  by lot or by such other method as the Property  Trustee  shall
deem fair and appropriate and which may provide for the selection for redemption
of  portions  (equal  to  $25.00  or an  integral  multiple  of $25.00 in excess
thereof) of the  Liquidation  Amount of the Preferred  Securities.  The Property
Trustee  shall  promptly  notify  the  Securities  Registrar  in  writing of the
Preferred  Securities  selected for redemption and, in the case of any Preferred
Securities selected for partial redemption, the Liquidation Amount thereof to be
redeemed;  it  being  understood  that,  in the  case  of  Preferred  Securities
registered  in the name of and held of record  by the  Clearing  Agency  (or any
successor) or any nominee,  the  distribution of the proceeds of such redemption
will be made in accordance  with the  procedures  of the Clearing  Agency or its
nominee. For all purposes of this Trust Agreement,  unless the context otherwise
requires,  all  provisions  relating to

                                       18
<PAGE>

the  redemption  of  Preferred  Securities  shall  relate,  in the  case  of any
Preferred  Securities redeemed or to be redeemed only in part, to the portion of
the  Liquidation  Amount  of  Preferred  Securities  which  has been or is to be
redeemed.  In the  event of any  redemption  in part,  the  Trust  shall  not be
required to (i) issue,  register  the  transfer of or exchange of any  Preferred
Security during a period beginning at the opening of business 15 days before any
selection  for  redemption  of Preferred  Securities  and ending at the close of
business on the earliest  date in which the  relevant  notice of  redemption  is
deemed  to have been  given to all  Holders  of  Preferred  Securities  to be so
redeemed  or  (ii)  register  the  transfer  of or  exchange  of  any  Preferred
Securities  so  selected  for  redemption,  in whole or in part,  except for the
unredeemed portion of any Preferred Securities being redeemed in part.

         (f) In the event of any redemption,  the Trust shall not be required to
issue,  register  the  transfer of or  register  the  exchange of any  Preferred
Security during a period beginning at the opening of business 15 days before any
Redemption Date and ending at the close of business on such Redemption Date.

         SECTION 4.3 Intentionally Omitted.

         SECTION 4.4 Special Event Exchange or Redemption.

         (a) If a Special  Event shall  occur and be  continuing,  the  Property
Trustee  shall  direct the  Exchange  Agent to exchange  all  Outstanding  Trust
Securities for Debt Securities  having a principal amount equal to the aggregate
Liquidation  Amount of the Trust  Securities  to be  exchanged  and with accrued
interest in an amount equal to any unpaid Distribution (including any Additional
Amounts) on the Trust Securities;  provided, however, that, in the case of a Tax
Event,  the  Sponsor  shall have the right to (i) direct  that less than all, or
none, as appropriate, of the Trust Securities be so exchanged if and for so long
as the Parent shall have elected to pay any Additional Sums such that the amount
received  by  Holders  of  Trust  Securities  not so  exchanged  in  respect  of
Distributions  and other  distributions  are not reduced as a result of such Tax
Event,  and  shall not have  revoked  any such  election  or failed to make such
payments  or (ii) cause the Trust  Securities  to be  redeemed in the manner set
forth below. If a Tax Event shall occur and be continuing, the Parent shall have
the right,  upon not less than 30 nor more than 60 days'  notice,  to redeem the
Debt  Securities,  in whole but not in part,  for cash within 180 days following
the  occurrence  and  continuation  of such Tax Event.  Promptly  following such
redemption,  Trust Securities with an aggregate  Liquidation Amount equal to the
aggregate  principal  amount of the Debt Securities so redeemed will be redeemed
by the Trust at the  Redemption  Price  applicable  in the event of a redemption
upon the occurrence of a Tax Event on a pro rata basis.

         (b) Notice of any exchange  pursuant to this Section 4.4 (an  "Exchange
Notice") of the Trust  Securities,  which Exchange  Notice shall be irrevocable,
will be given by the Property  Trustee by first-class mail to the Sponsor and to
each record  Holder of Trust  Securities  to be exchanged  not fewer than 30 nor
more than 60 days prior to the date fixed for exchange thereof.  For purposes of
the calculation of the date of exchange and the dates on which notices are given
pursuant to this paragraph  (b), an Exchange  Notice shall be deemed to be given
on the day such notice is first mailed by first-class mail, postage prepaid,  to
each  Holder.  Each  Exchange  Notice shall be addressed to each Holder of Trust
Securities at the address of such Holder  appearing in the Securities  Register.
Each  Exchange  Notice shall state:  (A) the exchange

                                       19
<PAGE>

date;  (B)  the  aggregate  Liquidation  Amount  and  any  unpaid  Distributions
(including any Additional  Amounts) on the Trust  Securities to be exchanged and
the aggregate  principal  amount and any accrued interest on the Debt Securities
to be exchanged therefor;  (C) that on the exchange date the Trust Securities to
be so exchanged shall be exchanged for Debt Securities and that Distributions on
the Trust  Securities  so exchanged  will cease to  accumulate on and after said
date; (D) the record date for the  determination  of Holders of Trust Securities
to be  exchanged  as provided  in Section  4.4(g);  and (E) the  identity of the
Exchange Agent, if any, and the place or places where each Trust  Certificate to
be exchanged is to be surrendered in exchange for Debt Securities.  No defect in
the Exchange Notice or in the mailing thereof with respect to any Trust Security
shall  affect the  validity  of the  exchange  proceedings  for any other  Trust
Security.

         (c)  In the  event  that  fewer  than  all  the  Outstanding  Preferred
Securities  are to be exchanged,  then, on the exchange  date, (i) if all of the
Outstanding   Preferred  Securities  are  represented  by  Definitive  Preferred
Securities  Certificates,  the particular  Preferred  Securities to be exchanged
will  be  selected  by the  Property  Trustee  from  the  Outstanding  Preferred
Securities not previously called for redemption or exchange on a pro rata basis,
and (ii) if all of the  Outstanding  Preferred  Securities  are  represented  by
Book-Entry Preferred Securities Certificates, the Property Trustee shall provide
for  the  selection  for  exchange  of  a  portion  of  the  Global  Certificate
representing  the Book-Entry  Preferred  Securities  Certificates  on a pro rata
basis.  In the case of clause (ii) above,  the particular  Book-Entry  Preferred
Securities Certificates to be exchanged shall be selected in accordance with the
applicable  rules and procedures for the Clearing Agency in whose name, or whose
nominee's name, such Global  Certificate is then held. Any Preferred  Securities
Certificate  that is to be exchanged only in part shall be surrendered  with due
endorsement or by a written  instrument of transfer fully executed by the Holder
thereof (or its attorney duly authorized in writing) and the Trust shall prepare
and deliver to such Holder,  without service charge, a new Preferred  Securities
Certificate or Certificates in aggregate stated Liquidation Amount equal to, and
in exchange for, the unredeemed portion of the Preferred Securities  Certificate
so surrendered. The Common Securities shall be exchanged in a similar manner.

         (d) In the event of an exchange  pursuant to this  Section  4.4, on the
date  fixed  for  any  such  exchange,  (i)  if  the  Preferred  Securities  are
represented by Book-Entry Preferred Securities Certificates, the Clearing Agency
or its nominee, as the record Holder of the Preferred Securities,  will exchange
through the Exchange  Agent the Global  Certificate  representing  the Preferred
Securities to be exchanged for a registered  Global  Certificate or certificates
representing the Debt Securities to be delivered upon such exchange, (ii) if the
Preferred   Securities  are  represented  by  Definitive   Preferred  Securities
Certificates,  the certificates  representing the Preferred  Securities to be so
exchanged will be deemed to represent Debt Securities  having a principal amount
equal to the aggregate stated  Liquidation  Amount of such Preferred  Securities
until such  certificates  are  presented to the Exchange  Agent for exchange for
definitive certificates representing Debt Securities and (iii) all rights of the
Holders of the  Preferred  Securities  so exchanged  will cease,  except for the
right of such Holders to receive Debt Securities. The Common Securities shall be
exchanged in a similar manner.

         (e) Each Holder,  by becoming a party to this Trust Agreement  pursuant
to Section  10.11 of this Trust  Agreement,  will be deemed to have agreed to be
bound by these

                                       20
<PAGE>

exchange  provisions  in regard to the  exchange  of Trust  Securities  for Debt
Securities pursuant to the terms described above.

         (f)  Nothing in this  Section 4.4 shall  limit the  requirement  of the
Trust to withhold taxes pursuant to the terms of the Trust  Securities or as set
forth in this Trust Agreement or otherwise  require the Property  Trustee or the
Trust to pay any amounts on account of such withholdings.

         (g) An exchange of Trust  Securities  for Debt  Securities  pursuant to
this Section 4.4 shall be made to Holders of Trust  Securities as they appear on
the Securities  Register for Trust Securities on the relevant record date, which
for so long as the Preferred  Securities remain in book-entry form only shall be
the date which is one Business Day before the exchange  date.  If the  Preferred
Securities are no longer in book-entry form only, the relevant record date shall
be the fifteenth day before the exchange date (whether or not a Business Day).

         (h) If a Special Event shall occur and be  continuing,  the Trust shall
maintain an office or agency (the "Exchange  Agent") for the purposes  specified
in this Section 4.4. The Regular  Trustees may remove any Exchange Agent if such
Trustees  determine  in their sole  discretion  that the Paying Agent shall have
failed to perform its  obligations  under this Trust  Agreement  in any material
respect.  The Exchange Agent shall initially be the Property Trustee. Any Person
acting as Exchange  Agent shall be permitted to resign as Exchange Agent upon 30
days' written notice to the Property Trustee and the Sponsor; provided, however,
that no such  resignation  of the  Exchange  Agent  shall be  effective  until a
successor Exchange Agent has been appointed and has accepted such appointment by
instrument executed by such successor Exchange Agent and delivered to the Trust,
the Sponsor and the  resigning  Exchange  Agent.  In the event that the Property
Trustee  shall no longer be the  Exchange  Agent or a successor  Exchange  Agent
shall resign or its  authority  to act be revoked,  the Regular  Trustees  shall
appoint a successor  that is acceptable to the Property  Trustee and the Sponsor
to act as Exchange  Agent.  The  provisions  of Sections  8.1, 8.3 and 8.6 shall
apply to the Property Trustee also in its role as Exchange Agent, for so long as
the Property Trustee shall act as Exchange Agent and, to the extent  applicable,
to any other exchange agent appointed hereunder.

         SECTION   4.5   Subordination   of  Common   Securities.   Payment   of
Distributions   (including  Additional  Amounts,  if  applicable)  on,  and  the
Redemption Price of, the Trust Securities, as applicable, shall be made pro rata
based on the Liquidation Amount of the Trust Securities; provided, however, that
if on any  Distribution  Date or Redemption  Date an Event of Default shall have
occurred and be continuing, no payment of any Distribution (including Additional
Amounts, if applicable) on, or the Redemption Price of, any Common Security, and
no other payment on account of the redemption,  liquidation or other acquisition
of  Common  Securities,  shall  be made  unless  payment  in full in cash of all
accumulated  and  unpaid   Distributions   (including   Additional  Amounts,  if
applicable) on all Outstanding Preferred Securities for all Distribution periods
terminating  on or prior  thereto,  or in the case of payment of the  Redemption
Price the full  amount of such  Redemption  Price on all  Outstanding  Preferred
Securities  to be redeemed,  shall have been made or provided for, and all funds
immediately  available  to the  Property  Trustee  shall first be applied to the
payment in full in cash of all Distributions  (including  Additional Amounts, if
applicable) on, or the Redemption  Price of,  Preferred  Securities then due and
payable.

                                       21
<PAGE>

         SECTION 4.6 Payment  Procedures.  Payments in respect of the  Preferred
Securities  shall be made by check mailed to the address of the Person  entitled
thereto as such  address  shall  appear on the  Securities  Register  or, if the
Preferred  Securities are held by a Clearing Agency, such Distributions shall be
made to the Clearing Agency in immediately  available  funds, in accordance with
the applicable certificate  depositary agreement on the applicable  Distribution
Dates. Payments in respect of the Common Securities shall be made in such manner
as shall be mutually  agreed between the Property  Trustee and the Holder of the
Common Securities.

         SECTION 4.7 Tax Returns and Reports. The Regular Trustees shall prepare
(or cause to be prepared),  at the Sponsor's expense, and file all United States
federal,  state and local tax and information returns and reports required to be
filed by or in respect of the Trust. In this regard,  the Regular Trustees shall
(a)  prepare  and file (or  cause to be  prepared  or  filed)  Form  1041 or the
appropriate Internal Revenue Service form required to be filed in respect of the
Trust in each taxable year of the Trust and (b) prepare and furnish (or cause to
be prepared and furnished) to each Securityholder a Form 1099 or the appropriate
Internal Revenue Service form required to be furnished to such Securityholder or
the information required to be provided on such form. The Regular Trustees shall
provide  the Sponsor  with a copy of all such  returns,  reports  and  schedules
promptly after such filing or furnishing.  The Trustees shall comply with United
States  federal  withholding  and backup  withholding  tax laws and  information
reporting requirements with respect to any payments to Securityholders under the
Trust Securities.

         SECTION 4.8 Payment of Taxes,  Duties, Etc., of the Trust. Upon receipt
under the Debt Securities of Additional Sums, the Property Trustee, upon receipt
of written notice from the Sponsor or the Regular  Trustees,  shall promptly pay
from  such  Additional  Sums  any  taxes,  duties  or  governmental  charges  of
whatsoever  nature (other than  withholding  taxes)  imposed on the Trust by the
United States or any other taxing authority.

         SECTION 4.9 Payments under Indenture.  Any amount payable  hereunder to
any  Holder  of  Preferred  Securities  shall be  reduced  by the  amount of any
corresponding  payment  such  Holder (or any Owner  with  respect  thereto)  has
directly  received  pursuant to Section 503 of the Indenture in accordance  with
the terms of Section 6.8 hereof.

                                   ARTICLE 5
                          TRUST SECURITIES CERTIFICATES

         SECTION 5.1 Initial Ownership. Upon the creation of the Trust and until
the  issuance of the Trust  Securities,  and at any time  during  which no Trust
Securities are  Outstanding,  the Sponsor shall be the sole beneficial  owner of
the Trust.

         SECTION 5.2 The Trust Securities Certificates. The Preferred Securities
Certificates  shall be issued in  minimum  denominations  of $25.00  Liquidation
Amount  and  integral  multiples  of $25.00 in excess  thereof,  and the  Common
Securities  Certificates  shall be issued in denominations of $25.00 Liquidation
Amount and integral multiples thereof.  The consideration  received by the Trust
for the issuance of the Trust  Securities shall constitute a contribution to the
capital of the Trust and shall not  constitute  a loan to the  Trust.  The Trust
Securities  Certificates  shall be  executed on behalf of the Trust by manual or
facsimile  signature of at least one Regular  Trustee and  authenticated  by the
Property Trustee.  Preferred  Securities initially will be

                                       22
<PAGE>

represented by one or more  certificates in registered  global form (the "Global
Certificates").  Trust Securities  Certificates  bearing the manual or facsimile
signatures of individuals who were, at the time when such signatures  shall have
been affixed, authorized to sign on behalf of the Trust, shall be validly issued
and entitled to the benefit of this Trust Agreement,  notwithstanding  that such
individuals  or any of them shall have ceased to be so  authorized  prior to the
delivery of such Trust  Securities  Certificates or did not hold such offices at
the date of delivery of such Trust  Securities  Certificates.  A transferee of a
Trust  Securities  Certificate  shall  become  a  Securityholder,  and  shall be
entitled  to the  rights  and  subject to the  obligations  of a  Securityholder
hereunder,  upon due registration of such Trust  Securities  Certificate in such
transferee's  name  pursuant  to  Section  5.4.  By  acceptance  of a  Preferred
Security, each Securityholder covenants for federal income tax purposes to treat
the Debt  Securities  as  indebtedness  of the Parent and to treat the Preferred
Securities as evidence of a beneficial ownership interest in the Debt Securities
through a grantor trust.

         SECTION 5.3 Delivery of Trust Securities  Certificates.  On the Closing
Date, the Regular  Trustees  shall cause Trust  Securities  Certificates,  in an
aggregate Liquidation Amount as provided in Sections 2.4 and 2.5, to be executed
on  behalf  of the  Trust  and  delivered  to or upon the  written  order of the
Sponsor,  signed by one of its trustees or any duly authorized  officer, if any,
without further trust action by the Sponsor, in authorized denominations.

         A Trust Security  Certificate shall not be valid until authenticated by
the manual  signature of an authorized  signatory of the Property  Trustee.  The
signature shall be conclusive  evidence that the Trust Security  Certificate has
been authenticated under this Trust Agreement. Upon a written order of the Trust
signed by one Regular Trustee, the Property Trustee shall authenticate the Trust
Security Certificates for original issue.

         The Property Trustee may appoint an authenticating  agent acceptable to
the  Regular   Trustees  to  authenticate   Trust  Security   Certificates.   An
authenticating agent may authenticate Trust Security  Certificates  whenever the
Property  Trustee  may  do  so.  Each  reference  in  this  Trust  Agreement  to
authentication by the Property Trustee includes authentication by such agent. An
authenticating  agent has the same rights as the  Property  Trustee to deal with
the  Sponsor  or an  Affiliate  with  respect  to the  authentication  of  Trust
Securities.

         SECTION  5.4   Registration  of  Transfer  and  Exchange  of  Preferred
Securities;  Restrictions on Transfer. The securities registrar (the "Securities
Registrar")  shall keep or cause to be kept, at the office or agency  maintained
pursuant to Section  5.8, a securities  register (a  "Securities  Register")  in
which,  subject  to  such  reasonable  regulations  as  it  may  prescribe,  the
Securities  Registrar shall provide for the registration of Preferred Securities
Certificates and Common Securities  Certificates (subject to Section 5.10 in the
case of the Common  Securities  Certificates)  and registration of transfers and
exchanges of Preferred Securities  Certificates as herein provided. The Property
Trustee shall be the initial Securities Registrar.

         Upon surrender for  registration of transfer of any Preferred  Security
at an office  or  agency of the  Securities  Registrar  designated  pursuant  to
Section 5.8 for such purpose,  a Regular  Trustee shall execute on behalf of the
Trust  by  manual  or  facsimile  signature,  and  the  Property  Trustee  shall
authenticate  and  deliver,  in  the  name  of  the  designated   transferee  or
transferees,   one

                                       23
<PAGE>

or more new Preferred  Securities of any authorized  denominations and of a like
aggregate Liquidation Amount.

         At the option of the  Holder,  and subject to the other  provisions  of
this Section 5.4,  Preferred  Securities  may be exchanged  for other  Preferred
Securities of any authorized denomination and of a like Liquidation Amount, upon
surrender  of the  Preferred  Securities  to be  exchanged at any such office or
agency.  Whenever any Preferred  Securities are so surrendered  for exchange,  a
Regular  Trustee  shall  execute  on behalf of the Trust by manual or  facsimile
signature,  and  the  Property  Trustee  shall  authenticate  and  deliver,  the
Preferred  Securities  which the  Holder  making the  exchange  is  entitled  to
receive.

         All Preferred  Securities  issued upon any  registration of transfer or
exchange of Preferred  Securities  shall be entitled to the same benefits  under
this  Trust  Agreement  as  the  Preferred  Securities   surrendered  upon  such
registration of transfer or exchange.

         Every Preferred  Security  presented or surrendered for registration of
transfer or for exchange shall (if so requested by the Sponsor or the Securities
Registrar)  be duly  endorsed,  or be  accompanied  by a written  instrument  of
transfer in form  satisfactory to the Sponsor and the Securities  Registrar duly
executed, by the Holder thereof or his attorney duly authorized in writing.

         No service  charge  shall be made for any  registration  of transfer or
exchange of Preferred Securities Certificates,  but the Securities Registrar may
require payment of a sum sufficient to cover any tax or governmental charge that
may be  imposed  in  connection  with any  transfer  or  exchange  of  Preferred
Securities Certificates.

         SECTION  5.5  Mutilated,  Destroyed,  Lost or Stolen  Trust  Securities
Certificates.  If (a)  any  mutilated  Trust  Securities  Certificate  shall  be
surrendered to the Securities  Registrar,  or if the Securities  Registrar shall
receive evidence to its  satisfaction of the  destruction,  loss or theft of any
Trust Securities  Certificate and (b) there shall be delivered to the Securities
Registrar and the Regular Trustees such security or indemnity as may be required
by them to save each of them  harmless,  then in the absence of notice that such
Trust Securities  Certificate shall have been acquired by a bona fide purchaser,
the Regular  Trustees,  or any one of them, on behalf of the Trust shall execute
and make available for authentication  and delivery,  in exchange for or in lieu
of any such mutilated, destroyed, lost or stolen Trust Securities Certificate, a
new Trust Securities  Certificate of like  denomination.  In connection with the
issuance  of any new  Trust  Securities  Certificate  under  this  Section,  the
Securities  Registrar  may require the payment of a sum  sufficient to cover any
tax or other  governmental  charge that may be imposed in connection  therewith.
Any duplicative  Trust  Securities  Certificate  issued pursuant to this Section
shall constitute  conclusive evidence of an undivided beneficial interest in the
assets of the Trust, as if originally issued, whether or not the lost, stolen or
destroyed Trust Securities Certificate shall be found at any time.

         SECTION  5.6  Persons  Deemed  Securityholders.  Each  Trustee  and the
Securities  Registrar shall treat the Person in whose name any Trust  Securities
Certificate shall be registered in the Securities  Register as the owner of such
Trust Securities Certificate for the purpose of

                                       24
<PAGE>

receiving  Distributions and for all other purposes whatsoever,  and none of the
Trustees  nor the  Securities  Registrar  shall be bound  by any  notice  to the
contrary.

         SECTION 5.7 Access to List of Securityholders' Names and Addresses. The
Regular  Trustees or the Sponsor shall furnish or cause to be furnished  (unless
the Property Trustee is acting as Securities Registrar with respect to the Trust
Securities  under  the Trust  Agreement)  a list,  in such form as the  Property
Trustee  may   reasonably   require,   of  the  names  and   addresses   of  the
Securityholders  as of the most recent record date (a) to the Property  Trustee,
quarterly at least five Business Days before each Distribution  Date, and (b) to
the Property Trustee, promptly after receipt by the Sponsor of a written request
therefor  from the Property  Trustee in order to enable the Property  Trustee to
discharge its obligations under this Trust Agreement, in each case to the extent
such  information is in the possession or control of the Regular Trustees or the
Sponsor and is not identical to a previously  supplied list or has not otherwise
been received by the Property  Trustee in its capacity as Securities  Registrar.
The rights of  Securityholders  to communicate with other  Securityholders  with
respect  to  their  rights  under  this  Trust  Agreement  or  under  the  Trust
Securities,  and the corresponding rights of the Trustee shall be as provided in
the  Trust  Indenture  Act.  Each  Holder,  by  receiving  and  holding  a Trust
Securities  Certificate,  and each Owner  shall be deemed to have  agreed not to
hold the Sponsor,  the Property Trustee or the Regular  Trustees  accountable by
reason of the disclosure of its name and address,  regardless of the source from
which such information was derived.

         SECTION 5.8 Maintenance of Office or Agency.  The Securities  Registrar
shall  maintain  in The City of New York an  office  or  offices  or  agency  or
agencies  where  Preferred  Securities   Certificates  may  be  surrendered  for
registration  of transfer,  exchange or conversion and where notices and demands
to or upon the Trustees in respect of the Trust  Securities  Certificates may be
served.  The Securities  Registrar  initially  designates  State Street Bank and
Trust  Company,  N.A.,  61  Broadway,  15th  Floor,  New York,  New York  10006,
Attention:  Corporate Trust Department,  as its principal corporate trust office
for such purposes.  The Securities Registrar shall give prompt written notice to
the  Sponsor  and to the  Securityholders  of any change in the  location of the
Securities Register or any such office or agency.

         SECTION  5.9  Appointment  of  Paying  Agent.  In the  event  that  the
Preferred  Securities are not in book-entry  form only, the Trust shall maintain
in the Borough of Manhattan,  City of New York, an office or agency (the "Paying
Agent") where the Preferred  Securities may be presented for payment. The Paying
Agent shall make Distributions to  Securityholders  from the Payment Account and
shall report the amounts of such  Distributions  to the Property Trustee and the
Regular  Trustees.  Any Paying Agent shall have the revocable  power to withdraw
funds from the  Payment  Account  for the  purpose  of making the  Distributions
referred  to above.  The Regular  Trustees  may revoke such power and remove the
Paying Agent if such Trustees determine in their sole discretion that the Paying
Agent shall have failed to perform its obligations under this Trust Agreement in
any material respect.  The Paying Agent shall initially be the Property Trustee,
and any  co-paying  agent chosen by the Property  Trustee and  acceptable to the
Regular  Trustees  and the Sponsor.  Any Person  acting as Paying Agent shall be
permitted to resign as Paying Agent upon 30 days' written notice to the Property
Trustee and the Sponsor;  provided,  however,  that no such  resignation  of the
Paying  Agent  shall  be  effective  until a  successor  Paying  Agent  has been
appointed  and has accepted  such  appointment  by  instrument  executed by such
successor Paying Agent and delivered to the Trust, the Sponsor and the resigning
Paying  Agent.

                                       25
<PAGE>

In the event that the Property  Trustee shall no longer be the Paying Agent or a
successor  Paying  Agent shall resign or its  authority  to act be revoked,  the
Regular  Trustees  shall appoint a successor  that is acceptable to the Property
Trustee and the Sponsor to act as Paying  Agent  (which shall be a bank or trust
company). Each successor Paying Agent or any additional Paying Agent shall agree
with the  Trustees  that,  as  Paying  Agent,  such  successor  Paying  Agent or
additional  Paying Agent will hold all sums,  if any,  held by it for payment to
the  Securityholders  in trust for the benefit of the  Securityholders  entitled
thereto until such sums shall be paid to each  Securityholder.  The Paying Agent
shall return all unclaimed  funds to the Property  Trustee and upon removal of a
Paying Agent such Paying Agent shall also return all funds in its  possession to
the Property Trustee. The provisions of Sections 8.1, 8.3 and 8.6 shall apply to
the  Property  Trustee  also in its  role as  Paying  Agent,  for so long as the
Property Trustee shall act as Paying Agent and, to the extent applicable, to any
other paying agent appointed  hereunder.  Any reference in this Agreement to the
Paying  Agent shall  include any  co-paying  agent  unless the context  requires
otherwise.

         SECTION  5.10  Ownership  of Common  Securities  by  Sponsor.  Upon the
issuance of Common  Securities as provided for in Section 2.5, the Sponsor shall
acquire beneficial and record ownership of the Common Securities. The Parent has
covenanted in the Guarantee to maintain directly or indirectly 100% ownership of
the Common  Securities;  provided  that any  successor  of the Parent  under the
Indenture may succeed to the Parent's ownership of the Common Securities. To the
fullest extent permitted by law, any attempted transfer of the Common Securities
in violation of that covenant  shall be void.  The Regular  Trustees shall cause
each  Common  Securities   Certificate  to  contain  a  legend  stating,   "THIS
CERTIFICATE  IS NOT  TRANSFERABLE  EXCEPT  TO AN ENTITY  WHOLLY  OWNED BY SENIOR
HOUSING  PROPERTIES TRUST OR TO CERTAIN  SUCCESSORS OF SENIOR HOUSING PROPERTIES
TRUST."

         SECTION  5.11  Global   Securities;   Non-Global   Securities;   Common
Securities Certificate.

         (a) Each Global  Certificate  authenticated  under this Trust Agreement
shall be registered in the name of the Clearing Agency designated by the Sponsor
for such Global  Certificate or a nominee thereof and delivered to such Clearing
Agency  or a  nominee  thereof  or  custodian  therefor,  and each  such  Global
Certificate shall constitute a Preferred Security for all purposes of this Trust
Agreement.

         (b) If a Global Certificate is to be exchanged for Definitive Preferred
Securities  Certificates  or canceled in whole, it shall be surrendered by or on
behalf of the Clearing Agency, its nominee or custodian to the Property Trustee,
as  Securities  Registrar,  for  exchange  or  cancellation  as provided in this
Article 5. If any Global Certificate is to be exchanged for Definitive Preferred
Securities  Certificates or cancelled in part, or if another Preferred  Security
is to be exchanged  in whole or in part for a beneficial  interest in any Global
Certificate,  in each case,  as  provided in Section  5.4,  then either (i) such
Global  Certificate  shall be so  surrendered  for exchange or  cancellation  as
provided in this Article 5 or (ii) the Liquidation  Amount thereof (or number of
Preferred  Securities  represented  thereby) shall be reduced or increased by an
amount equal to the portion,  thereof to be so exchanged or cancelled,  or equal
to the  Liquidation  Amount of (or  number of  securities  represented  by) such
Definitive  Preferred

                                       26
<PAGE>

Security  Certificates to be so exchanged for a beneficial  interest therein, as
the case may be, by means of an  appropriate  adjustment  made on the records of
the Property Trustee, as Securities  Registrar,  whereupon the Property Trustee,
in accordance with the Applicable Procedures, shall instruct the Clearing Agency
or its  authorized  representative  to make a  corresponding  adjustment  to its
records.  Upon any such  surrender  or  adjustment  of a Global  Certificate,  a
Regular  Trustee  shall  execute  on behalf of the Trust by manual or  facsimile
signature,  and the  Property  Trustee  shall,  subject  to  Section  5.4 and as
otherwise  provided in this Article 5,  authenticate  and deliver any  Preferred
Securities  issuable in exchange  for such  Global  Certificate  (or any portion
thereof) to or upon the written order of, and registered in such names as may be
directed  by, the Clearing  Agency or its  authorized  representative.  Upon the
request of the Property  Trustee in connection with the occurrence of any of the
events specified in this paragraph, the Sponsor shall promptly make available to
the Property Trustee a reasonable supply of Preferred Securities that are not in
the form of Global  Certificates.  The  Property  Trustee  shall be  entitled to
conclusively rely upon any order, direction or request of the Clearing Agency or
its authorized  representative which is given or made pursuant to this Article 5
if such  order,  direction  or request is given or made in  accordance  with the
Applicable Procedures.

         (c)  Every  Preferred   Security   authenticated   and  delivered  upon
registration  of  transfer  of,  or in  exchange  for or in lieu  of,  a  Global
Certificate  or any  portion  thereof,  whether  pursuant  to this  Article 5 or
otherwise,  shall be authenticated and delivered in the form of, and shall be, a
Global Certificate,  unless such Preferred Security is registered in the name of
a Person other than the Clearing Agency for such Global Certificate or a nominee
thereof.

         (d) The Clearing Agency or its nominee, as registered owner of a Global
Certificate,  shall be the Holder of such Global  Certificate  for all  purposes
under  this  Trust  Agreement  and  the  Preferred  Securities,  and  owners  of
beneficial  interests in a Global Certificate shall hold such interests pursuant
to the Applicable Procedures.  Accordingly, any such Owner's beneficial interest
in a Global Certificate will be shown only on, and the transfer of such interest
shall be effected only through, records maintained by the Clearing Agency or its
nominee or its participants and such owners of beneficial  interests in a Global
Certificate  will  not be  considered  the  owners  or  Holders  of such  Global
Certificate for any purpose of this Trust Agreement or the Preferred Securities.

         (e) A single  Common  Securities  Certificate  representing  the Common
Securities  shall initially be issued to the Sponsor in the form of a definitive
Common Securities Certificate.

         SECTION 5.12 Notices to Clearing Agency. To the extent that a notice or
other communication to the Owners is required under this Trust Agreement, unless
and until Definitive Preferred Securities Certificates shall have been issued to
Owners  pursuant to Section 5.13,  the Trustees  shall give all such notices and
communications  specified  herein to be given to Owners to the Clearing  Agency,
and shall have no obligations to provide notices directly to the Owners.

         SECTION   5.13   Definitive    Preferred    Securities    Certificates.
Notwithstanding  any  other  provision  in  this  Trust  Agreement,   no  Global
Certificate  may be  exchanged  in  whole or in part  for  Preferred  Securities
registered,  and no transfer of a Global  Certificate in whole or in part may be
registered,  in the name of any Person other than the  Clearing  Agency for such
Global

                                       27
<PAGE>

Certificate  or a  nominee  thereof  unless  (i) such  Clearing  Agency  (A) has
notified the Trust and the Sponsor that it is unwilling or unable to continue as
Clearing  Agency for such Global  Certificate or (B) has ceased to be a clearing
agency registered as such under the Securities Exchange Act of 1934, as amended,
and in  either  case the  Trust  and the  Sponsor  thereupon  fail to  appoint a
successor  Clearing  Agency,  (ii) the Trust and the Sponsor,  at their  option,
notify the  Property  Trustee in writing that it elects to cause the issuance of
the Preferred Securities in certificated form or (iii) there shall have occurred
and be  continuing  an Event of Default or any event which after notice or lapse
of time or both would be an Event of Default. In all cases, Definitive Preferred
Securities  Certificates  delivered  in exchange for any Global  Certificate  or
beneficial  interests therein will be registered in the names, and issued in any
approved  denominations,  requested by or on behalf of the  Clearing  Agency (in
accordance with its customary procedures).

         SECTION  5.14 Rights of  Securityholders.  The legal title to the Trust
Property is vested exclusively in the Property Trustee (in its capacity as such)
in accordance with Section 2.9, and the Securityholders shall not have any right
or title therein other than the undivided  beneficial  interest in the assets of
the Trust  conferred by their Trust  Securities  and they shall have no right to
call for any  partition or division of property,  profits or rights of the Trust
except as  described  below.  The Trust  Securities  shall be personal  property
giving  only  the  rights  specifically  set  forth  therein  and in this  Trust
Agreement.  The Trust Securities shall have no preemptive or similar rights and,
when issued and  delivered to  Securityholders  against  payment of the purchase
price  therefor,  will be fully  paid  and  nonassessable  undivided  beneficial
interests in the assets of the Trust.  The Holders of the Trust  Securities,  in
their  capacities as such,  shall be entitled to the same limitation of personal
liability extended to stockholders of private  corporations for profit organized
under Title 2 of the Maryland General  Corporation Law; provided,  however,  the
Holders of Trust  Securities  may be  obligated,  pursuant  to the terms of this
Trust Agreement, to (i) provide indemnity and/or security in connection with and
pay taxes or governmental charges arising from transfers of Trust Securities and
(ii)  provide  security  and  indemnity  in  connection  with the requests of or
directions  to the Property  Trustee to exercise its rights and powers under the
Trust Agreement.

                                   ARTICLE 6
                    ACT OF SECURITYHOLDERS; MEETINGS; VOTING

         SECTION 6.1 Limitations on Voting Rights.

         (a) Except as provided in this Section,  in Section 8.2 and 10.2 and in
the  Indenture  and as  otherwise  required  by  law,  no  Holder  of  Preferred
Securities shall have any right to vote or in any manner  otherwise  control the
administration,  operation and management of the Trust or the obligations of the
parties  hereto,  nor shall anything herein set forth, or contained in the terms
of the Trust  Securities  Certificates,  be  construed so as to  constitute  the
Securityholders from time to time as partners or members of an association.

         (b) Subject to Section 8.2 hereof,  if an Event of Default with respect
to the Preferred  Securities has occurred and been subsequently cured, waived or
otherwise  eliminated,  the provisions of Section 6.1(b)(ii) hereof shall apply.
During (x) the period  commencing  on the date of the  occurrence of an Event of
Default with  respect to the  Preferred  Securities  and ending

                                       28
<PAGE>

on the date when such Event of Default is cured, waived or otherwise eliminated,
or (y) any  period  not  described  in  either  the  preceding  sentence  or the
preceding clause (x), the provisions of Section 6.1(b)(i) shall apply.

                  (i) The Holders of a majority in aggregate  Liquidation Amount
         of the  Preferred  Securities  will have the right to direct  the time,
         method and place of conducting any proceeding for any remedy  available
         to the  Property  Trustee or to exercise  any trust or power  conferred
         upon the Property  Trustee  under this Trust  Agreement,  including the
         right to direct the Property Trustee to exercise the remedies available
         to it as a holder of the Debt  Securities  but  excluding  the right to
         direct the Property Trustee to consent to an amendment, modification or
         termination  of the Indenture  (which shall be as provided  below).  So
         long as any Debt  Securities  are  held by the  Property  Trustee,  the
         Trustees shall not (A) direct the time,  method and place of conducting
         any proceeding for any remedy  available to the Indenture  Trustee,  or
         executing any trust or power  conferred on the  Indenture  Trustee with
         respect to such Debt  Securities,  (B) waive any past default  which is
         waivable under Section 513 of the Indenture,  (C) exercise any right to
         rescind  or  annul a  declaration  that the  principal  of all the Debt
         Securities  shall be due and payable or (D)  consent to any  amendment,
         modification  or termination  of the Indenture or the Debt  Securities,
         where such consent shall be required,  without, in each case, obtaining
         the  prior   approval  of  the  Holders  of  a  majority  in  aggregate
         Liquidation Amount of all Outstanding  Preferred  Securities (except in
         the case of clause (D),  which  consent,  in the event that no Event of
         Default  shall  occur and be  continuing,  shall be of the Holders of a
         majority  in  aggregate  Liquidation  Amount of all  Trust  Securities,
         voting  together as a single class);  provided,  however,  that where a
         consent under the Indenture would require the consent of each holder of
         Debt Securities affected thereby, no such consent shall be given by the
         Property  Trustee  without the prior written  consent of each Holder of
         Preferred  Securities.   The  Trustees  shall  not  revoke  any  action
         previously  authorized  or  approved  by a vote of the  Holders  of the
         Preferred Securities, except by a subsequent vote of the Holders of the
         Preferred Securities.  The Property Trustee shall notify all Holders of
         record of the Preferred  Securities  of any notice of default  received
         from the  Indenture  Trustee  with respect to the Debt  Securities.  In
         addition to  obtaining  the  foregoing  approvals of the Holders of the
         Preferred Securities, prior to taking any of the foregoing actions, the
         Trustees  shall,  at the expense of the  Sponsor,  obtain an Opinion of
         Counsel  experienced  in such matters to the effect that the Trust will
         not  be  classified  as an  association  taxable  as a  corporation  or
         partnership for United States federal income tax purposes on account of
         such action.

                  (ii) Subject to Section 8.2 of this Trust  Agreement  and only
         after the Event of Default with respect to the Preferred Securities has
         been cured, waived, or otherwise eliminated,  the Holders of a majority
         in aggregate  Liquidation Amount of the Common Securities will have the
         right to direct the time, method and place of conducting any proceeding
         for any remedy  available  to the  Property  Trustee or to exercise any
         trust or power  conferred  upon the Property  Trustee  under this Trust
         Agreement,  including  the  right to direct  the  Property  Trustee  to
         exercise  the  remedies  available  to  it  as a  holder  of  the  Debt
         Securities  but excluding  the right to direct the Property  Trustee to
         consent to an amendment,  modification  or termination of the Indenture
         (which shall be as provided below).  So long as any Debt Securities are
         held by the Property  Trustee,  the  Trustees

                                       29
<PAGE>

         shall not (A)  direct  the time,  method  and place of  conducting  any
         proceeding  for any  remedy  available  to the  Indenture  Trustee,  or
         executing any trust or power  conferred on the  Indenture  Trustee with
         respect to such Debt  Securities,  (B) waive any past default  which is
         waivable under Section 513 of the Indenture,  (C) exercise any right to
         rescind  or  annul a  declaration  that the  principal  of all the Debt
         Securities  shall be due and payable or (D)  consent to any  amendment,
         modification  or termination  of the Indenture or the Debt  Securities,
         where such consent shall be required,  without, in each case, obtaining
         the  prior   approval  of  the  Holders  of  a  majority  in  aggregate
         Liquidation  Amount of all  Common  Securities  (except  in the case of
         clause (D), which consent,  in the event that no Event of Default shall
         occur and be  continuing,  shall be of the  Holders  of a  majority  in
         aggregate  Liquidation Amount of all Trust Securities,  voting together
         as a single class);  provided,  however, that where a consent under the
         Indenture  would require the consent of each holder of Debt  Securities
         affected  thereby,  no such  consent  shall be  given  by the  Property
         Trustee  without  the prior  written  consent of each  Holder of Common
         Securities.  The  Trustees  shall  not  revoke  any  action  previously
         authorized  or  approved  by a  vote  of  the  Holders  of  the  Common
         Securities,  except by a  subsequent  vote of the Holders of the Common
         Securities.  The Property Trustee shall notify all Holders of record of
         the  Common  Securities  of any  notice of  default  received  from the
         Indenture  Trustee with respect to the Debt Securities.  In addition to
         obtaining  the  foregoing  approvals  of  the  Holders  of  the  Common
         Securities,  prior to taking any of the foregoing actions, the Trustees
         shall,  at the  expense  of the  Sponsor,  obtain an Opinion of Counsel
         experienced  in such  matters to the effect  that the Trust will not be
         classified as an  association  taxable as a corporation  or partnership
         for  United  States  federal  income  tax  purposes  on account of such
         action.

                  (iii) The provisions of this Section 6.1(b) and Section 6.1(a)
         of this Trust Agreement shall be in lieu of Section 316(a)(1)(A) of the
         Trust Indenture Act, and such Section  316(a)(1)(A) is hereby expressly
         excluded from this Trust  Agreement and the  Preferred  Securities,  as
         permitted by the Trust Indenture Act.

         (c) If any proposed  amendment to this Trust Agreement provides for, or
the  Trustees  otherwise  propose  to effect,  the  dissolution,  winding-up  or
termination  of the  Trust,  other  than  pursuant  to the  terms of this  Trust
Agreement,  then the Holders of Outstanding Preferred Securities as a class will
be entitled to vote on such amendment or proposal and such amendment or proposal
shall not be effective  except with the approval of the Holders of a majority in
aggregate Liquidation Amount of the Outstanding Preferred Securities.

         SECTION 6.2 Notice of  Meetings.  Notice of all meetings of the Holders
of the Preferred Securities, stating the time, place and purpose of the meeting,
shall  be  given  by the  Property  Trustee  pursuant  to  Section  10.8 to each
Preferred  Securityholder of record, at its registered address, at least 15 days
and not more than 90 days before the meeting. At any such meeting,  any business
properly  before the meeting may be so  considered  whether or not stated in the
notice of the meeting.  Any adjourned  meeting may be held as adjourned  without
further notice.

         SECTION 6.3 Meetings of Preferred Securityholders. No annual meeting of
Securityholders  is required to be held. The Regular  Trustees,  however,  shall
call a meeting of

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<PAGE>

Securityholders  to vote on any matter upon the written request of the Preferred
Securityholders  of record of 25% of the Preferred  Securities (based upon their
Liquidation  Amount),  and the Regular  Trustees or the Property Trustee may, at
any time in  their  discretion,  call a  meeting  of the  Holders  of  Preferred
Securities to vote on any matters as to which such Holders are entitled to vote.

         Holders of record of a majority of the Preferred Securities (based upon
their  Liquidation  Amount),  present in person or by proxy,  shall constitute a
quorum at any meeting of Securityholders.

         If a quorum is present at a meeting, an affirmative vote by the Holders
of record of  Preferred  Securities  present,  in person or by proxy,  holding a
majority of the Preferred  Securities (based upon their Liquidation Amount) held
by Holders of record of  Preferred  Securities  present,  either in person or by
proxy,  at such  meeting  shall  constitute  the action of the  Securityholders,
unless this Trust Agreement requires a greater number of affirmative votes.

         SECTION  6.4 Voting  Rights.  Securityholders  shall be entitled to one
vote for each $25.00 of Liquidation Amount represented by their Trust Securities
in respect of any matter as to which such  Securityholders are entitled to vote.
Notwithstanding  that  Holders of Preferred  Securities  are entitled to vote or
consent under any of the  circumstances  described  above,  any of the Preferred
Securities  that are  owned at such time by the  Sponsor,  the  Trustees  or any
affiliate of any Trustee shall, for purposes of such vote or consent, be treated
as if such Preferred Securities were not outstanding.

         SECTION  6.5  Proxies,  Etc.  At any  meeting of  Securityholders,  any
Securityholders  entitled to vote  thereat may vote by proxy,  provided  that no
proxy  shall be voted at any  meeting  unless it shall have been  placed on file
with the Regular  Trustees,  or with such other officer or agent of the Trust as
the Regular  Trustees may direct,  for  verification  prior to the time at which
such vote shall be taken.  Pursuant to a  resolution  of the  Property  Trustee,
proxies  may be  solicited  in the name of the  Property  Trustee or one or more
officers  of the  Property  Trustee.  Only  Securityholders  of record  shall be
entitled to vote. When Trust Securities are held jointly by several Persons, any
one of them may vote at any meeting in person or represented by proxy in respect
of such Trust Securities,  but if more than one of them shall be present at such
meeting in person or by proxy, and such joint owners or their proxies so present
disagree  as to any vote to be cast,  such vote shall not be received in respect
of such Trust Securities. A proxy purporting to be executed by or on behalf of a
Securityholder  shall  be  deemed  valid  unless  challenged  at or prior to its
exercise, and the burden of proving invalidity shall rest on the challenger.  No
proxy shall be valid more than three years after its date of execution.

         SECTION 6.6 Securityholder  Action by Written Consent. Any action which
may be taken by  Securityholders  at a meeting may be taken without a meeting if
Securityholders  holding a majority of all Outstanding  Trust Securities  (based
upon their  Liquidation  Amount)  entitled to vote in respect of such action (or
such larger proportion  thereof as shall be required by any express provision of
this Trust Agreement) shall consent to the action in writing.

         SECTION 6.7 Record Date for Voting and Other Purposes. For the purposes
of determining the  Securityholders who are entitled to notice of and to vote at
any meeting or by

                                       31
<PAGE>

written  consent,  or to participate in any Distribution on the Trust Securities
in respect of which a record date is not  otherwise  provided  for in this Trust
Agreement, or for the purpose of any other action, the Regular Trustees may from
time to time fix a date,  not more than 90 days prior to the date of any meeting
of  Securityholders or the payment of Distributions or other action, as the case
may  be,  as a  record  date  for  the  determination  of  the  identity  of the
Securityholders of record for such purposes.

         SECTION   6.8   Acts   of   Securityholders.   Any   request,   demand,
authorization,  direction,  notice,  consent, waiver or other action provided or
permitted by this Trust Agreement to be given, made or taken by  Securityholders
or  Owners  may be  embodied  in and  evidenced  by one or more  instruments  of
substantially  similar tenor signed by such  Securityholders or Owners in person
or by an agent duly  appointed in writing;  and,  except as otherwise  expressly
provided  herein,  such action shall become  effective  when such  instrument or
instruments are delivered to a Regular  Trustee.  Such instrument or instruments
(and the action  embodied  therein and evidenced  thereby) are herein  sometimes
referred  to as  the  "Act"  of  the  Securityholders  or  Owners  signing  such
instrument  or  instruments.  Proof of execution of any such  instrument or of a
writing  appointing  any such agent shall be sufficient  for any purpose of this
Trust  Agreement  and  (subject  to  Section  8.1)  conclusive  in  favor of the
Trustees, if made in the manner provided in this Section.

         The fact and date of the execution by any Person of any such instrument
or writing may be proved by the affidavit of a witness of such execution or by a
certificate  of a notary  public  or  other  officer  authorized  by law to take
acknowledgments of deeds, certifying that the individual signing such instrument
or writing acknowledged to him the execution thereof. Where such execution is by
a  signer  acting  in a  capacity  other  than  his  individual  capacity,  such
certificate  or  affidavit  shall  also  constitute   sufficient  proof  of  his
authority. The fact and date of the execution of any such instrument or writing,
or the  authority of the Person  executing  the same,  may also be proved in any
other manner which any Trustee receiving the same deems sufficient.

         The ownership of Preferred Securities shall be proved by the Securities
Register.

         Any request, demand, authorization,  direction, notice, consent, waiver
or other Act of the Securityholder of any Trust Security shall bind every future
Securityholder of the same Trust Security and the  Securityholder of every Trust
Security  issued  upon the  registration  of  transfer  thereof  or in  exchange
therefor or in lieu thereof in respect of anything done,  omitted or suffered to
be done by the  Trustees  or the  Trust  in  reliance  thereon,  whether  or not
notation of such action is made upon such Trust Security.

         Without limiting the foregoing, a Securityholder  entitled hereunder to
take any action hereunder with regard to any particular Trust Security may do so
with regard to all or any part of the Liquidation  Amount of such Trust Security
or by one or more duly appointed agents each of which may do so pursuant to such
appointment with regard to all or any part of such Liquidation Amount.

         If any dispute shall arise between the  Securityholders and the Regular
Trustees or among such  Securityholders  or Regular Trustees with respect to the
authenticity,  validity or binding nature of any request, demand, authorization,
direction,  consent, waiver or other Act of such

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<PAGE>

Securityholder  or Trustee under this Article 6, then the  determination of such
matter by the Property Trustee shall be conclusive with respect to such matter.

         Upon the  occurrence  and  continuation  of an Event  of  Default,  the
Holders of Preferred  Securities  shall rely on the  enforcement by the Property
Trustee of its rights as holder of the Debt  Securities  against the Parent.  If
the  Property  Trustee  fails  to  enforce  its  rights  as  holder  of the Debt
Securities  after a request therefor by a Holder of Preferred  Securities,  such
holder  may  proceed  to enforce  such  rights  directly  against  the  Sponsor.
Notwithstanding  the  foregoing,  if an Event of  Default  has  occurred  and is
continuing  and such event is  attributable  to the failure of the Parent to pay
interest  or  principal  on the Debt  Securities  on the date such  interest  or
principal is otherwise payable (or in the case of redemption,  on the Redemption
Date), then a Holder of Preferred Securities shall have the right to institute a
proceeding  directly  against the  Parent,  for  enforcement  of payment to such
holder  of the  principal  amount of or  interest  on Debt  Securities  having a
principal  amount equal to the  aggregate  Liquidation  Amount of the  Preferred
Securities of such Holder after the  respective  due date  specified in the Debt
Securities (a "Direct Action").  In connection with any such Direct Action,  the
rights of the  Parent  will be  subrogated  to the  rights of any  Holder of the
Preferred  Securities  to the extent of any  payment  made by the Parent to such
Holder of Preferred Securities as a result of such Direct Action.

         SECTION 6.9 Inspection of Records. Upon reasonable demand and notice to
the Regular Trustees and the Property Trustee, any Securityholder shall have the
right,  at its expense,  to inspect  during usual  business  hours the following
records  of  the  Trust,   solely  for  purposes   reasonably  related  to  such
Securityholder's interest as a holder of Trust Securities:

         (a) a copy of this Trust  Agreement and the Certificate of Trust of the
Trust and all amendments thereto,  together with copies of any written powers of
attorney under which this Trust Agreement, such Certificate of Trust or any such
amendment have been executed;

         (b) if and to the extent  disclosure  thereof  is at the time  required
under the  provisions of the Maryland  Business Trust Act, a current list of the
name and last known business or mailing address of each Securityholder; and

         (c) the separate  annual  financial  statements  of the Trust,  if such
financial statements are prepared.

Any such  demand and notice  shall be in writing  and shall state the purpose of
the demand.

                                   ARTICLE 7
                         REPRESENTATIONS AND WARRANTIES

         SECTION 7.1 Representations and Warranties of the Property Trustee. The
Property  Trustee hereby  represents and warrants for the benefit of the Sponsor
and the Securityholders that:

         (a) the Property  Trustee is a trust  company duly  organized,  validly
existing  and  in  good  standing  under  the  laws  of  the   Commonwealth   of
Massachusetts;

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<PAGE>

         (b) the Property Trustee has full corporate power,  authority and legal
right to execute, deliver and perform its obligations under this Trust Agreement
and has taken all  necessary  action to authorize  the  execution,  delivery and
performance by it of this Trust Agreement;

         (c)  this  Trust  Agreement  has been  duly  authorized,  executed  and
delivered by the Property  Trustee and constitutes the valid and legally binding
agreement of the Property Trustee  enforceable against it in accordance with its
terms, subject to bankruptcy,  insolvency, fraudulent transfer,  reorganization,
moratorium  and similar laws of general  applicability  relating to or affecting
creditors' rights and to general equity principles; and

         (d) the execution,  delivery and performance by the Property Trustee of
this Trust  Agreement  have been duly  authorized by all necessary  corporate or
other action on the part of the Property Trustee and do not require any approval
of  stockholders  of the  Property  Trustee  and such  execution,  delivery  and
performance  will not violate the Property  Trustee's  charter or by-laws or (b)
violate any law,  governmental  rule or  regulation  of the United States or the
Commonwealth  of  Massachusetts,  as the case  may be,  governing  the  banking,
corporate,  or trust powers of the Property Trustee,  or any order,  judgment or
decree applicable to the Property Trustee.

         SECTION 7.2  Representations  and  Warranties  of Sponsor.  The Sponsor
hereby  represents and warrants for the benefit of the Property  Trustee and the
Securityholders that:

         (a) the Trust  Securities  Certificates  issued on the Closing  Date on
behalf  of the  Trust  have  been  duly  authorized  and will have been duly and
validly executed, issued and delivered by the Trustees pursuant to the terms and
provisions of, and in accordance with the  requirements of, this Trust Agreement
and the  Securityholders  will be, as of such date,  entitled to the benefits of
this Trust Agreement; and

         (b) there are no taxes, fees or other  governmental  charges payable by
the Trust (or the  Trustees on behalf of the Trust)  under the laws of the State
of  Maryland  or any  political  subdivision  thereof  in  connection  with  the
execution,  delivery  and  performance  by the  Property  Trustee  of this Trust
Agreement.

                                   ARTICLE 8
                                  THE TRUSTEES

         SECTION 8.1 Certain Duties and Responsibilities.

         (a)  The  duties  and  responsibilities  of the  Trustees  shall  be as
provided by this Trust  Agreement and, in the case of the Property  Trustee,  by
the Trust  Indenture  Act. The Property  Trustee,  before the  occurrence of any
Event of Default  and after the curing or waiving of all Events of Default  that
may have occurred,  shall  undertake to perform only such duties and obligations
as are  specifically  set forth in this Trust  Agreement and the Trust Indenture
Act and no implied covenants shall be read into this Trust Agreement against the
Property  Trustee.  In case an Event of Default has occurred  (that has not been
cured or waived  pursuant to Section 8.2) of which a Responsible  Officer of the
Property Trustee has actual knowledge,  the Property

                                       34
<PAGE>

Trustee  shall  exercise  such  rights  and  powers  vested in it by this  Trust
Agreement and the Trust Indenture Act, and use the same degree of care and skill
in its  exercise,  as a  prudent  individual  would  exercise  or use  under the
circumstances in the conduct of his or her own affairs.

         Notwithstanding  the  foregoing,  no provision of this Trust  Agreement
shall require the Trustees to expend or risk their own funds or otherwise  incur
any financial liability in the performance of any of their duties hereunder,  or
in the exercise of any of their rights or powers,  if they shall have reasonable
grounds for believing that repayment of such funds or adequate indemnity against
such risk or liability is not  reasonably  assured to it. Whether or not therein
expressly so provided,  every provision of this Trust Agreement  relating to the
conduct or affecting  the  liability of or affording  protection to the Trustees
shall be  subject  to the  provisions  of this  Section.  Nothing  in this Trust
Agreement shall be construed to release the Regular  Trustees from liability for
their own grossly negligent action,  their own grossly negligent failure to act,
or their own willful misconduct.

         To the extent that, at law or in equity,  a Regular  Trustee has duties
(including fiduciary duties) and liabilities relating thereto to the Trust or to
the Securityholders, such Regular Trustee shall not be liable to the Trust or to
any  Securityholder  to the maximum extent that Maryland law in effect from time
to time  permits  limitation  of the  liability  of trustees  and  officers of a
business trust. The provisions of this Trust Agreement,  to the extent that they
restrict the duties and liabilities of the Regular Trustees  otherwise  existing
at law or in  equity,  are  agreed by the  Sponsor  and the  Securityholders  to
replace such other duties and liabilities of the Regular Trustees.

         (b) All  payments  made by the  Property  Trustee or a Paying  Agent in
respect of the Trust Securities shall be made only from the revenue and proceeds
from the Trust  Property  and only to the extent that there shall be  sufficient
revenue or proceeds from the Trust Property to enable the Property  Trustee or a
Paying  Agent to make  payments  in  accordance  with  the  terms  hereof.  Each
Securityholder,  by its acceptance of a Trust Security, agrees that it will look
solely to the revenue and proceeds from the Trust Property to the extent legally
available for  distribution  to it as herein  provided and that the Trustees are
not personally liable to it for any amount distributable in respect of any Trust
Security  or for any other  liability  in  respect of any Trust  Security.  This
Section 8.1(b) does not limit the liability of the Trustees  expressly set forth
elsewhere in this Trust  Agreement or, in the case of the Property  Trustee,  in
the Trust Indenture Act.

         (c) No provision of this Trust  Agreement shall be construed to relieve
the Property  Trustee  from  liability  for its own  negligent  action,  its own
negligent failure to act, or its own willful misconduct, except that:

                  (i) the Property  Trustee shall not be liable for any error of
         judgment  made in good faith by an  authorized  officer of the Property
         Trustee,  unless  it shall be  proved  that the  Property  Trustee  was
         negligent in ascertaining the pertinent facts;

                  (ii) the Property  Trustee shall not be liable with respect to
         any  action  taken  or  omitted  to be  taken  by it in good  faith  in
         accordance with the direction of the Holders of a majority in aggregate
         Liquidation Amount of the Trust Securities relating to the time,

                                       35
<PAGE>

         method and place of conducting any proceeding for any remedy  available
         to the Property  Trustee,  or exercising  any trust or power  conferred
         upon the Property Trustee under this Trust Agreement;

                  (iii) the  Property  Trustee's  sole duty with  respect to the
         custody,  safekeeping and physical  preservation of the Debt Securities
         and  the  Payment  Account  shall  be to deal  with  such  property  as
         fiduciary  assets,  subject  to  the  protections  and  limitations  on
         liability  afforded to the Property  Trustee under this Trust Agreement
         and the Trust Indenture Act;

                  (iv) the Property Trustee shall not be liable for any interest
         on any  money  received  by it  except as it may  otherwise  agree,  in
         writing,  with the Sponsor and money held by the Property  Trustee need
         not be segregated from other funds held by it except in relation to the
         Payment Account  maintained by the Property Trustee pursuant to Section
         3.1 and except to the extent otherwise required by law;

                  (v)  the  Property   Trustee  shall  not  be  responsible  for
         monitoring the  compliance by the Regular  Trustees or the Sponsor with
         their  respective  duties  under  this Trust  Agreement,  nor shall the
         Property Trustee be liable for the default or misconduct of the Regular
         Trustees or the Sponsor;

                  (vi) the Property Trustee shall have no duty or liability with
         respect to the value, genuineness, existence or sufficiency of the Debt
         Securities  or the  payment of any taxes or  assessments  thereon or in
         connection therewith;

                  (vii) the duties and obligations of the Property Trustee shall
         be determined solely by the express  provisions of this Trust Agreement
         and in the  Preferred  Securities  and the  Common  Securities  and the
         Property Trustee shall not be liable except for the performance of such
         duties  and  obligations  as are  specifically  set forth in this Trust
         Agreement and in the Preferred  Securities  and the Common  Securities,
         and no implied  covenants or obligations  shall be read into this Trust
         Agreement against the Property Trustee; and

                  (viii) no provision of this Trust  Agreement shall require the
         Property  Trustee  to expend or risk its own funds or  otherwise  incur
         personal financial liability in the performance of any of its duties or
         in the  exercise  of any of its  rights  or  powers,  if it shall  have
         reasonable  grounds for  believing  that the repayment of such funds or
         liability is not reasonably assured to it under the terms of this Trust
         Agreement or indemnity reasonably  satisfactory to the Property Trustee
         against such risk or liability is not reasonably assured to it.

         SECTION 8.2 Notice of Defaults.

         (a)  Within  ten days  after the  occurrence  of any  Event of  Default
actually known to a Responsible  Officer of the Property  Trustee,  the Property
Trustee  shall  transmit,  in the manner and to the extent  provided  in Section
10.8,  notice of such Event of Default to the Holders of  Preferred  Securities,
the Regular  Trustees and the Sponsor,  unless such Event of

                                       36
<PAGE>

Default shall have been cured or waived,  provided that, except for a default in
the payment of principal of (or premium,  if any) or interest on any of the Debt
Securities,  the Property  Trustee shall be fully protected in withholding  such
notice if and so long as the Board of Trustees,  the executive  committee,  or a
trust committee of directors and/or Responsible Officers of the Property Trustee
in good faith determines that the withholding of such notice is in the interests
of the Holders of the Preferred Securities.

         (b)  Within  ten days  after the  receipt  of  notice  of the  Parent's
exercise  of its  right to  extend  the  interest  payment  period  for the Debt
Securities  pursuant to the Indenture,  the Property Trustee shall transmit,  in
the manner and to the extent  provided in Section 10.8,  notice of such exercise
to the Securityholders, unless such exercise shall have been revoked.

         (c) The  Holders  of a  majority  in  Liquidation  Amount of  Preferred
Securities  may,  by vote,  on behalf  of the  Holders  of all of the  Preferred
Securities,  waive  any past  Event  of  Default  in  respect  of the  Preferred
Securities and its  consequences,  provided  that, if the  underlying  Indenture
Event of Default:

                  (i) is not waivable under the Indenture,  the Event of Default
         under this Trust Agreement shall also not be waivable; or

                  (ii)  requires  the consent or vote of greater than a majority
         in principal  amount of the holders of the Debt  Securities,  including
         the consent or vote of all such  holders,  (a "Super  Majority")  to be
         waived  under the  Indenture,  the Event of  Default  under  this Trust
         Agreement  may only be  waived by the vote of the  Holders  of the same
         proportion in Liquidation  Amount of the Preferred  Securities that the
         relevant Super Majority represents of the aggregate principal amount of
         the Debt Securities outstanding.

         The  provisions of Section  6.1(b) and this Section  8.2(c) shall be in
lieu of  Section  316(a)(1)(B)  of the  Trust  Indenture  Act and  such  Section
316(a)(1)(B) of the Trust Indenture Act is hereby  expressly  excluded from this
Trust  Agreement  and  the  Preferred  Securities,  as  permitted  by the  Trust
Indenture Act. Upon such waiver,  any such default shall cease to exist, and any
Event of Default  with respect to the  Preferred  Securities  arising  therefrom
shall be deemed to have been cured,  for every purpose of this Trust  Agreement,
but no such waiver shall extend to any  subsequent  or other default or an Event
of  Default  with  respect  to the  Preferred  Securities  or  impair  any right
consequent thereon.  Any waiver by the Holders of the Preferred Securities of an
Event of Default with respect to the Preferred  Securities  shall also be deemed
to constitute a waiver by the Holders of the Common Securities of any such Event
of Default with respect to the Common  Securities for all purposes of this Trust
Agreement without any further act, vote, or consent of the Holders of the Common
Securities.

         (d) The  Holders  of a  majority  in  Liquidation  Amount of the Common
Securities  may,  by  vote,  on  behalf  of the  Holders  of  all of the  Common
Securities,  waive  any  past  Event  of  Default  with  respect  to the  Common
Securities and its  consequences,  provided  that, if the  underlying  Indenture
Event of Default:

                  (i) is not  waivable  under the  Indenture,  except  where the
         Holders of the Common  Securities  are deemed to have waived such Event
         of Default under the Trust

                                       37
<PAGE>

         Agreement  as  provided  below in this  Section  8.2(d),  the  Event of
         Default under this Trust Agreement shall also not be waivable; or

                  (ii)  requires  the consent or vote of a Super  Majority to be
         waived, except where the Holders of the Common Securities are deemed to
         have  waived  such Event of  Default  under  this  Trust  Agreement  as
         provided below in this Section 8.2(d),  the Event of Default under this
         Trust  Agreement  may only be waived by the vote of the  Holders of the
         same proportion in Liquidation Amount of the Common Securities that the
         relevant Super Majority represents of the aggregate principal amount of
         the Debt Securities outstanding;  provided further, that each Holder of
         Common  Securities  will be deemed  to have  waived  any such  Event of
         Default and all Events of Default with respect to the Common Securities
         and its  consequences  until all Events of Default  with respect to the
         Preferred  Securities have been cured, waived or otherwise  eliminated,
         and  until  such  Events  of  Default  have  been so  cured,  waived or
         otherwise eliminated,  the Property Trustee will be deemed to be acting
         solely on behalf of the Holders of the  Preferred  Securities  and only
         the Holders of the Preferred  Securities  will have the right to direct
         the Property  Trustee in accordance  with the terms of the  Securities.
         The  provisions of Section  6.1(b) and this Section  8.2(d) shall be in
         lieu of  Section  316(a)(1)(B)  of the  Trust  Indenture  Act and  such
         Section  316(a)(1)(B)  of the Trust  Indenture Act is hereby  expressly
         excluded from this Trust  Agreement and the  Preferred  Securities,  as
         permitted  by  the  Trust  Indenture  Act.  Subject  to  the  foregoing
         provisions of this Section 8.2(d),  upon such waiver,  any such default
         shall  cease to exist  and any Event of  Default  with  respect  to the
         Common Securities  arising therefrom shall be deemed to have been cured
         for every  purpose of this Trust  Agreement,  but no such waiver  shall
         extend to any  subsequent  or other  default or Event of  Default  with
         respect  to the  Common  Securities  or  impair  any  right  consequent
         thereon.

         (e) A waiver of a Indenture Event of Default by the Property Trustee at
the direction of the Holders of the Preferred  Securities,  constitutes a waiver
of the corresponding Event of Default under this Trust Agreement.  The foregoing
provisions of this Section  8.2(e) shall be in lieu of Section  316(a)(1)(B)  of
the Trust Indenture Act and such Section 316(a)(1)(B) of the Trust Indenture Act
is  hereby  expressly  excluded  from this  Trust  Agreement  and the  Preferred
Securities, as permitted by the Trust Indenture Act.

         SECTION  8.3  Certain  Rights  of  Property  Trustee.  Subject  to  the
provisions of Section 8.1:

         (a) the  Property  Trustee  may  conclusively  rely and  shall be fully
protected in acting or refraining from acting in good faith upon any resolution,
Opinion  of  Counsel,  certificate,   written  representation  of  a  Holder  or
transferee  such as of a  certificate  presented for  transfer,  certificate  of
auditors  or any other  certificate,  statement,  instrument,  opinion,  report,
notice,  request,  consent,  order,  appraisal,  bond,  debenture,  note,  other
evidence of indebtedness or other paper or document believed by it to be genuine
and to have been signed or presented by the proper party or parties;

         (b) if no Event of Default has occurred and is  continuing  and, (i) in
performing  its duties  under  this  Trust  Agreement  the  Property  Trustee is
required to decide

                                       38
<PAGE>

between  alternative  courses  of  action  or  (ii)  in  construing  any  of the
provisions in this Trust Agreement the Property Trustee finds the same ambiguous
or inconsistent with any other provisions contained herein or (iii) the Property
Trustee is unsure of the  application of any provision of this Trust  Agreement,
then,  except as to any matter as to which the Holders of  Preferred  Securities
are  entitled  to vote under the terms of this  Trust  Agreement,  the  Property
Trustee shall deliver a notice to the Sponsor requesting written instructions of
the  Sponsor  as to the  course of action to be taken and the  Property  Trustee
shall take such  action,  or refrain  from taking such  action,  as the Property
Trustee shall be  instructed  in writing to take, or to refrain from taking,  by
the Sponsor;  provided,  however,  that if the Property Trustee does not receive
such instructions of the Sponsor within ten Business Days after it has delivered
such notice, or such reasonably  shorter period of time set forth in such notice
(which to the extent  practicable  shall not be less than two Business Days), it
may,  but shall be under no duty to, take or refrain from taking such action not
inconsistent  with this Trust  Agreement as it shall deem  advisable  and in the
best interests of the Securityholders, in which event the Property Trustee shall
have  no  liability  except  for  its  own  bad  faith,  negligence  or  willful
misconduct;

         (c)  any  direction  or act  of the  Sponsor  or the  Regular  Trustees
contemplated  by this Trust  Agreement  shall be  sufficiently  evidenced  by an
Officers' Certificate;

         (d)  whenever  in the  administration  of  this  Trust  Agreement,  the
Property  Trustee shall deem it desirable  that a matter be  established  before
undertaking,  suffering or omitting any action  hereunder,  the Property Trustee
(unless other evidence is herein specifically prescribed) may, in the absence of
bad  faith  on its  part,  request  and  conclusively  rely  upon  an  Officers'
Certificate and an Opinion of Counsel which, upon receipt of such request, shall
be promptly  delivered by the Sponsor or the Regular Trustees;  (e) the Property
Trustee shall have no duty to accomplish any recording,  filing or  registration
of any  instrument  (including  any financing or  continuation  statement or any
filing  under  tax  or  securities  laws)  or  any   rerecording,   refiling  or
reregistration thereof;

         (f) the  Property  Trustee may consult  with  counsel at the  Sponsor's
expense (which  counsel may be counsel to the Sponsor or any of its  Affiliates,
and may  include  any of its  employees)  and the advice of such  counsel or any
Opinion of Counsel shall be full and complete  authorization  and  protection in
respect of any action  taken,  suffered or omitted by it hereunder in good faith
and in reliance  thereon and in  accordance  with such advice;  and the Property
Trustee  shall have the right at any time to seek  instructions  concerning  the
administration of this Trust Agreement from any court of competent jurisdiction;

         (g) the Property  Trustee  shall be under no obligation to exercise any
of the rights or powers  vested in it by this Trust  Agreement at the request or
direction of any of the Securityholders pursuant to this Trust Agreement, unless
such  Securityholders  shall have  offered to the  Property  Trustee  reasonable
security or indemnity  satisfactory to it against the costs, expenses (including
attorneys' fees and expenses and the expenses of the Property  Trustee's agents,
custodians  or  nominees)  and  liabilities  which  might be  incurred  by it in
compliance with such request or direction;

                                       39
<PAGE>

         (h) the Property  Trustee shall not be bound to make any  investigation
into the facts or matters  stated in any  resolutions,  certificate,  statement,
instrument,  opinion,  report, notice, request,  consent, order, approval, bond,
debenture,  note or other evidence of  indebtedness  or other paper or document,
but the Property  Trustee may make such further  inquiry or  investigation  into
such facts or custodian or nominee matters as it may see fit;

         (i) the  Property  Trustee  may  execute  any of the  trusts  or powers
hereunder or perform any duties  hereunder  either directly or by or through its
agents,  custodians or nominees,  attorneys or an  Affiliate,  provided that the
Property  Trustee shall not be responsible for the negligence or recklessness on
the part of any agent,  attorney,  custodian or nominee appointed by it with due
care hereunder;

         (j) whenever in the administration of this Trust Agreement the Property
Trustee  shall  deem it  desirable  to  receive  instructions  with  respect  to
enforcing any remedy or right or taking any other action hereunder, the Property
Trustee (i) may request  instructions  from the Holders of the Trust Securities,
which  instructions  may only be given by the Holders of the same  proportion in
Liquidation  Amount of the Trust  Securities  as would be entitled to direct the
Property  Trustee  under the terms of the Trust  Securities  in  respect of such
remedy, right or action, (ii) may refrain from enforcing such remedy or right or
taking such other action until such  instructions are received,  and (iii) shall
be fully protected in conclusively  relying on or acting in accordance with such
instructions;

         (k) except as otherwise expressly provided by this Trust Agreement, the
Property  Trustee  shall not be under any  obligation to take any action that is
discretionary under the provisions of this Trust Agreement;

         (l) to the maximum extent that Maryland law in effect from time to time
permits the  limitation  of the liability of trustees and officers of a business
trust, the Property Trustee shall not be liable for any action taken,  suffered,
or omitted to be taken by it in connection with this Trust Agreement; and

         (m) in the event that the  Property  Trustee is also acting as a Paying
Agent,  Exchange Agent and/or  Securities  Registrar  hereunder,  the rights and
protections  afforded to the Property  Trustee  pursuant to this Article 8 shall
also  be  afforded  to such  Paying  Agent,  Exchange  Agent  and/or  Securities
Registrar.

         No provision of this Trust Agreement shall be deemed to impose any duty
or obligation on the Property Trustee to perform any act or acts or exercise any
right, power, duty or obligation conferred or imposed on it, in any jurisdiction
in which it  shall  be  illegal,  or in  which  the  Property  Trustee  shall be
unqualified  or incompetent in accordance  with  applicable  law, to perform any
such act or acts, or to exercise any such right,  power, duty or obligation.  No
permissive  power  or  authority  available  to the  Property  Trustee  shall be
construed to be a duty.

         SECTION 8.4 Not Responsible for Recitals or Issuance of Securities. The
recitals contained herein and in the Trust Securities  Certificates shall not be
taken as the  statements  of the  Trustees,  and the  Trustees do not assume any
responsibility for their correctness.  The

                                       40
<PAGE>

Trustees shall not be  accountable  for the use or application by the Sponsor of
the proceeds of the Debt Securities.

         SECTION 8.5 May Hold  Securities.  Except as provided in the definition
of the term  "Outstanding"  in Article 1, any  Trustee or any other agent of any
Trustee or the Trust,  in its individual or any other  capacity,  may become the
owner or pledgee of Trust  Securities and,  subject to Section 8.8 and 8.12, may
otherwise  deal with the Trust with the same rights it would have if it were not
a Trustee or such other agent.

         SECTION 8.6 Compensation; Indemnity; Fees.

         The Sponsor agrees:

         (a) to pay the Trustees from time to time reasonable  compensation  for
all services rendered by them hereunder (which compensation shall not be limited
by any provision of law in regard to the compensation of a trustee of an express
trust);

         (b) except as otherwise  expressly  provided  herein and subject to the
applicable  limitations  set forth in subsection (c) or (d) below,  to reimburse
each  Trustee,  or  advance  expenses  to each  Trustee,  upon  request  for all
reasonable expenses, disbursements and advances incurred or made by such Trustee
in  accordance  with  any  provision  of this  Trust  Agreement  (including  the
reasonable  compensation  and the expenses and  disbursements  of its agents and
counsel);

         (c) to the fullest extent permitted by applicable law, to indemnify and
hold  harmless  (i) each  Regular  Trustee,  (ii) any  Affiliate  of any Regular
Trustee, (iii) any officer, director, shareholder,  employee,  representative or
agent of any Regular Trustee, and (iv) any employee or agent of the Trust or its
Affiliates  (referred  to herein as an "Sponsor  Indemnified  Person")  from and
against any loss, damage,  liability, tax, penalty, expense or claim of any kind
or nature whatsoever  incurred by such Sponsor  Indemnified  Person by reason of
the  creation,  operation,  dissolution  or  termination  of  the  Trust  or  in
connection with the administration of the Trust or any act or omission performed
or omitted by such  Sponsor  Indemnified  Person on behalf of the Trust,  except
that no Sponsor  Indemnified  Person  shall be  entitled  to be  indemnified  in
respect of any loss, damage or claim incurred by such Sponsor Indemnified Person
if it has been  established  that  such  expense,  disbursement  or  advance  is
attributable to such Sponsor Indemnified  Person's own grossly negligent action,
grossly negligent failure to act, or willful misconduct;

         (d) to the fullest extent permitted by applicable law, to indemnify and
hold  harmless the Property  Trustee for, and to hold it harmless  against,  any
loss, liability or expense incurred without negligence or bad faith on its part,
arising out of or in connection  with the  acceptance or  administration  of the
trust or trusts hereunder,  including the costs and expenses of defending itself
against any claim or liability in connection with the exercise or performance of
any of its powers or duties hereunder; and

         (e) no Trustee may claim any lien or charge on any Trust  Property as a
result of any amount due pursuant to this Section 8.6.

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<PAGE>

         SECTION 8.7 Property Trustee Required; Eligibility of Trustees.

         (a)  There  shall at all times be a  Property  Trustee  hereunder  with
respect to the Trust Securities.  The Property Trustee shall be a Person that is
eligible  pursuant to the Trust  Indenture Act to act as such and has a combined
capital  and  surplus  of at least  $50,000,000.  If any such  Person  publishes
reports of condition at least annually,  pursuant to law or to the  requirements
of its  supervising  or  examining  authority,  then  for the  purposes  of this
Section,  the combined  capital and surplus of such Person shall be deemed to be
its  combined  capital  and  surplus as set forth in its most  recent  report of
condition so published.  If at any time the Property Trustee with respect to the
Trust Securities shall cease to be eligible in accordance with the provisions of
this  Section,  it shall  resign  immediately  in the manner and with the effect
hereinafter specified in this Article.

         (b) There shall at all times be one or more Regular Trustees  hereunder
with respect to the Trust  Securities.  Each Regular  Trustee  shall be either a
natural  person who is at least 21 years of age or a legal entity that shall act
through one or more persons authorized to bind that entity.

         SECTION 8.8 Conflicting Interests. If the Property Trustee has or shall
acquire a conflicting  interest  within the meaning of the Trust  Indenture Act,
the Property  Trustee shall either  eliminate  such  interest or resign,  to the
extent and in the manner  provided  by, and  subject to the  provisions  of, the
Trust Indenture Act and this Trust Agreement.

         SECTION 8.9 Resignation and Removal; Appointment of Successor.

         (a) Subject to Sections 8.9(b),  Trustees (the "Relevant  Trustee") may
be appointed or removed without cause at any time:

                  (i) until the  issuance  of any Trust  Securities,  by written
         instrument executed by the Sponsor; and

                  (ii)  after the  issuance  of any  Securities,  by vote of the
         Holders of a majority in  Liquidation  Amount of the Common  Securities
         voting as a class.

         (b) The Trustee that acts as Property  Trustee  shall not be removed in
accordance with Section 8.9(a) until a successor  possessing the  qualifications
to act as a Property Trustee under Section 8.7 (a "Successor  Property Trustee")
has been appointed and has accepted such  appointment by instrument  executed by
such Successor  Property Trustee and delivered to the Trust, the Sponsor and the
removed Property Trustee.

         (c) A Trustee  appointed  to office shall hold office until his, her or
its successor shall have been appointed or until his, her or its death, removal,
resignation,  dissolution  or  liquidation.  Any  Trustee may resign from office
(without  need for prior or subsequent  accounting)  by an instrument in writing
signed  by the  Trustee  and  delivered  to the  Sponsor  and the  Trust,  which
resignation  shall take effect upon such  delivery or upon such later date as is
specified therein; provided, however, that:

                                       42
<PAGE>

                  (i) No  such  resignation  of the  Trustee  that  acts  as the
         Property Trustee shall be effective:

                           (A)  until a  Successor  Property  Trustee  has  been
                  appointed  and has accepted  such  appointment  by  instrument
                  executed by such Successor  Property  Trustee and delivered to
                  the Trust, the Sponsor and the resigning Property Trustee; or

                           (B)  until  the   assets  of  the  Trust   have  been
                  completely  liquidated and the proceeds thereof distributed to
                  the Holders of the Securities;

                  (ii) no appointment of a successor  Property  Trustee shall be
         effective  until  all  fees,  charges,  and  expenses  of the  retiring
         Property Trustee have been paid.

         (d) The Holders of the Common  Securities  shall use their best efforts
to  promptly  appoint a  Successor  Property  Trustee  if the  Property  Trustee
delivers an instrument of resignation in accordance with Section 8.9(c).

         (e) If no Successor  Property  Trustee  shall have been  appointed  and
accepted  appointment  as  provided  in this  Section  8.9  within 60 days after
delivery  pursuant  to this  Section  8.9 of an  instrument  of  resignation  or
removal,  the Property Trustee resigning or being removed may petition any court
of competent  jurisdiction for appointment of a Successor Property Trustee. Such
court may  thereupon,  after  prescribing  such  notice,  if any, as it may deem
proper and prescribe, appoint a Successor Property Trustee.

         (f) No Property  Trustee  shall be liable for the acts or  omissions to
act of any Successor Property Trustee.

         (g) The Property Trustee shall give notice of each resignation and each
removal  of a  Trustee  and  each  appointment  of a  successor  Trustee  to all
Securityholders  in the manner provided in Section 10.8 and shall give notice to
the  Sponsor.  Each  notice  shall  include the name of the  successor  Relevant
Trustee  and the address of its  Corporate  Trust  Office if it is the  Property
Trustee.

         (h)  Notwithstanding the foregoing or any other provision of this Trust
Agreement,  in the event any  Regular  Trustee  who is a natural  person dies or
becomes,  in the  opinion of the  Sponsor,  incompetent  or  incapacitated,  the
vacancy  created by such death,  incompetence or incapacity may be filled by (a)
the unanimous act of the remaining Regular Trustees if there are at least two of
them or (b)  otherwise by the Sponsor  (with the  successor in each case being a
Person who satisfies the eligibility  requirement for Regular Trustees set forth
in Section 8.7).

         The indemnity provided to a Trustee under Section 8.6 shall survive any
Trustee's resignation or removal or termination of this Trust Agreement.

         SECTION 8.10  Acceptance of  Appointment  by Successor.  In case of the
appointment  hereunder of a successor  Relevant  Trustee,  the retiring Relevant
Trustee  and each  successor  Relevant  Trustee  shall  execute  and  deliver an
amendment  hereto  wherein each  successor

                                       43
<PAGE>

Relevant  Trustee shall accept such appointment and which (a) shall contain such
provisions as shall be necessary or desirable to transfer and confirm to, and to
vest in, each  successor  Relevant  Trustee all the rights,  powers,  trusts and
duties of the  retiring  Relevant  Trustee and (b) shall add to or change any of
the  provisions of this Trust  Agreement as shall be necessary to provide for or
facilitate the  administration of the trusts hereunder by more than one Relevant
Trustee,  it being  understood  that nothing herein or in such  amendment  shall
constitute  such  Relevant  Trustees as  co-trustees  and upon the execution and
delivery of such amendment the  resignation or removal of the retiring  Relevant
Trustee  shall  become  effective to the extent  provided  therein and each such
successor Relevant Trustee,  without any further act, deed or conveyance,  shall
become  vested with all the rights,  powers,  trusts and duties of the  retiring
Relevant  Trustee;  but,  on  request  of the  Trust or any  successor  Relevant
Trustee, such retiring Relevant Trustee shall duly assign,  transfer and deliver
to such successor Relevant Trustee all Trust Property,  all proceeds thereof and
money held by such retiring Relevant Trustee hereunder.

         Upon request of any such successor  Relevant  Trustee,  the Trust shall
execute  any and all  instruments  for more fully and  certainly  vesting in and
confirming to such successor Relevant Trustee all such rights, powers and trusts
referred to in the first or second preceding paragraph, as the case may be.

         No successor  Relevant  Trustee shall accept its appointment  unless at
the time of such acceptance such successor  Relevant  Trustee shall be qualified
and eligible under this Article.

         SECTION  8.11  Merger,  Conversion,   Consolidation  or  Succession  to
Business. Any Person into which the Property Trustee or any Regular Trustee that
is not a  natural  person  may be merged or  converted  or with  which it may be
consolidated,   or  any  Person   resulting  from  any  merger,   conversion  or
consolidation  to  which  such  Relevant  Trustee  shall  be  a  party,  or  any
corporation  succeeding to all or substantially all the corporate trust business
of such  Relevant  Trustee,  shall be the  successor  of such  Relevant  Trustee
hereunder,  provided such Person shall be otherwise qualified and eligible under
this Article, without the execution or filing of any paper or any further act on
the part of any of the parties hereto.

         SECTION  8.12  Preferential  Collection  of Claims  Against  Sponsor or
Trust.  If and when the  Property  Trustee  shall be or become a creditor of the
Sponsor or the Trust (or any other obligor upon the Debt Securities or the Trust
Securities), the Property Trustee shall be subject to and shall take all actions
necessary  in order to comply with the  provisions  of the Trust  Indenture  Act
regarding  the  collection  of claims  against the Sponsor or Trust (or any such
other obligor).

         SECTION 8.13 Reports by Property  Trustee.  Within 60 days after May 15
of each year,  commencing  with the first May 15,  after the first  issuance  of
Preferred  Securities,  the Property Trustee shall provide to the Holders of the
Preferred  Securities  such  reports as are required by Section 313 of the Trust
Indenture Act, if any, in the form and in the manner  provided by Section 313 of
the Trust  Indenture  Act.  The  Property  Trustee  shall also  comply  with the
requirements of Section 313(d) of the Trust Indenture Act.

         SECTION  8.14  Reports to the  Property  Trustee.  The  Sponsor and the
Regular  Trustees on behalf of the Trust shall  provide to the Property  Trustee
such  documents,  reports and  information as are required by Section 314 of the
Trust Indenture Act (if any) and the

                                       44
<PAGE>

compliance  certificate required by Section 314(a) of the Trust Indenture Act in
the form,  in the manner and at the times  required  by Section 314 of the Trust
Indenture Act.

         SECTION 8.15 Evidence of Compliance with Conditions Precedent.  Each of
the Sponsor and the Regular Trustees on behalf of the Trust shall provide to the
Property Trustee such evidence of compliance with any conditions  precedent,  if
any,  provided for in this Trust Agreement that relate to any of the matters set
forth in Section 314(c) of the Trust  Indenture Act. Any  certificate or opinion
required to be given by an officer  pursuant to Section  314(c)(1)  of the Trust
Indenture Act shall be given in the form of an Officers' Certificate.

         SECTION 8.16 Number of Trustees.

         (a) The number of Trustees shall be three,  provided that the Holder of
all of the Common Securities by written  instrument may increase or decrease the
number of Regular Trustees.

         (b) If a Trustee ceases to hold office for any reason and the number of
Regular Trustees is not reduced pursuant to Section 8.16(a), or if the number of
Trustees is increased pursuant to Section 8.16(a), a vacancy shall occur.

         (c)  The   death,   resignation,   retirement,   removal,   bankruptcy,
incompetence  or incapacity to perform the duties of a Trustee shall not operate
to dissolve,  terminate or annul the Trust.  Whenever a vacancy in the number of
Regular Trustees shall occur, until such vacancy is filled by the appointment of
a Regular  Trustee in  accordance  with  Section  8.9,  the Regular  Trustees in
office,  regardless of their number (and  notwithstanding any other provision of
this  Agreement),  shall have all the powers granted to the Regular Trustees and
shall  discharge all the duties imposed upon the Regular  Trustees by this Trust
Agreement.

         SECTION 8.17 Delegation of Power.

         (a) Any  Regular  Trustee  may, by power of  attorney  consistent  with
applicable  law,  delegate to any other natural person over the age of 21 his or
her power for the purpose of executing  any  documents  contemplated  in Section
2.7(a), including any registration statement or amendment thereof filed with the
Commission, or making any other governmental filing.

         (b) The Regular Trustees shall have power to delegate from time to time
to such of their  number  or to the  Sponsor  the doing of such  things  and the
execution  of such  instruments  either in the name of the Trust or the names of
the Regular Trustees or otherwise as the Regular Trustees may deem expedient, to
the extent such  delegation is not  prohibited by applicable  law or contrary to
the provisions of the Trust, as set forth herein.

                                   ARTICLE 9
                       DISSOLUTION, LIQUIDATION AND MERGER

         SECTION 9.1 Dissolution upon Expiration Date. Unless earlier dissolved,
the Trust shall dissolve on June 15, 2041 (the "Expiration  Date") or as soon as
possible thereafter.

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<PAGE>

         SECTION  9.2  Early  Dissolution.  The  first  to  occur  of any of the
following events is an "Early Dissolution Event":

         (a)  the  occurrence  of a  Bankruptcy  Event  in  respect  of,  or the
dissolution or liquidation  (other than a deemed  liquidation  for tax purposes)
of, the Parent or the Sponsor;

         (b) the occurrence of a Special Event except in the case of a Tax Event
following  which the  Parent  has  elected  (i) to pay any  Additional  Sums (in
accordance  with  Section  4.4) such that the net amount  received by Holders of
Preferred  Securities in respect of Distributions are not reduced as a result of
such Tax Event and the Parent has not  revoked  any such  election  or failed to
make such payments or (ii) to redeem all or some of the Debt Securities pursuant
to Section 4.4(a);

         (c)  the  redemption,  conversion  or  exchange  of all  of  the  Trust
Securities;

         (d) an order for  dissolution of the Trust shall have been entered by a
court of competent jurisdiction; and

         (e) receipt by the Property  Trustee of written  notice from the Parent
or the Sponsor at any time (which  direction is optional  and wholly  within the
discretion  of the Parent and the Sponsor,  as the case may be) of its intention
to dissolve the Trust and  distribute  the Debt  Securities  in exchange for the
Preferred Securities.

         SECTION   9.3    Dissolution.    The   respective    obligations    and
responsibilities  of the Trustees  and the Trust  created and  continued  hereby
shall terminate upon the latest to occur of the following:  (a) the distribution
by the Property  Trustee to  Securityholders  upon the  liquidation of the Trust
pursuant to Section 9.4, or upon the  redemption of all of the Trust  Securities
pursuant to Section  4.2, of all amounts  required to be  distributed  hereunder
upon the final payment of the Trust Securities;  (b) the payment of all expenses
owed by the Trust;  and (c) the  discharge of all  administrative  duties of the
Regular  Trustees,  including the  performance of any tax reporting  obligations
with respect to the Trust or the Securityholders.

         SECTION 9.4 Liquidation.

         (a) If an Early  Dissolution Event specified in clause (a), (b), (d) or
(e) of  Section  9.2  occurs or upon the  Expiration  Date,  the Trust  shall be
liquidated  by the Trustees as  expeditiously  as the  Trustees  determine to be
possible by distributing,  after satisfaction of liabilities to creditors of the
Trust as  provided  by  applicable  law,  to each  Securityholder  an  aggregate
principal amount of Debt Securities equal to the aggregate Liquidation Amount of
Trust  Securities  held by such  Holder,  subject to Section  9.4(d).  Notice of
liquidation shall be given by the Property Trustee by first-class mail,  postage
prepaid, mailed not later than 30 nor more than 60 days prior to the Liquidation
Date to each Holder of Trust  Securities at such Holder's  address as it appears
in the Securities Register.  All notices of liquidation shall be prepared by the
Regular Trustees and shall:

                  (i) state the Liquidation Date;

                                       46
<PAGE>

                  (ii) state  that,  from and after the  Liquidation  Date,  the
         Trust  Securities  will no longer be deemed to be  Outstanding  and any
         Trust  Securities  Certificates  not  surrendered  for exchange will be
         deemed to represent an aggregate  principal  amount of Debt  Securities
         equal to the aggregate  Liquidation Amount of Preferred Securities held
         by such Holder; and

                  (iii) provide such  information  with respect to the mechanics
         by which Holders may exchange Trust  Securities  Certificates  for Debt
         Securities,  or, if  Section  9.4(d)  applies,  receive  a  Liquidation
         Distribution,  as the Regular  Trustees or the Property  Trustee  shall
         deem appropriate.

         (b) Except where Section 9.2(c) or 9.4(d)  applies,  in order to effect
the  liquidation  of the  Trust  and  distribution  of the  Debt  Securities  to
Securityholders,  the Property  Trustee  shall  establish a record date for such
distribution (which date shall be not more than 45 days prior to the Liquidation
Date and, unless the Property  Trustee  determines  otherwise,  (i) shall be the
date which,  for so long as the Preferred  Securities  remain in book-entry form
only, is one Business Day before the Liquidation  Date, or (ii) if the Preferred
Securities  are no longer in  book-entry  form only,  shall be the fifteenth day
before the Liquidation  Date (whether or not a Business Day)) and, either itself
acting as  exchange  agent or through  the  appointment  of a separate  exchange
agent,  shall establish such  procedures as it shall deem  appropriate to effect
the  distribution  of Debt  Securities  in exchange  for the  Outstanding  Trust
Securities Certificates.

         (c)  Except  where  Section  9.2(c)  or  9.4(d)   applies,   after  the
Liquidation  Date,  (i) the  Trust  Securities  will no  longer  be deemed to be
Outstanding,  (ii) the Clearing  Agency or its nominee,  as the record holder of
such  Trust  Securities,   will  receive  a  registered  global  certificate  or
certificates  representing  the  Debt  Securities  to  be  delivered  upon  such
distribution  and  (iii)  any  Trust  Securities  Certificates  not  held by the
Clearing  Agency will be deemed to represent an  aggregate  principal  amount of
Debt  Securities  equal  to  the  aggregate   Liquidation  Amount  of  Preferred
Securities  held by such Holders,  and bearing accrued and unpaid interest in an
amount equal to the accrued and unpaid  Distributions  on such Trust  Securities
until such  certificates  are presented to the Property  Trustee for transfer or
reissuance.

         (d) In the event that,  notwithstanding  the other  provisions  of this
Section 9.4,  whether because of an order for dissolution  entered by a court of
competent jurisdiction or otherwise,  distribution of the Debt Securities in the
manner  provided  herein  is  determined  by  the  Property  Trustee  not  to be
practicable,  the Trust  Property  shall be  liquidated,  and the Trust shall be
wound-up or terminated,  by the Property  Trustee in such manner as the Property
Trustee  determines,  and a majority  of the  Regular  Trustees  shall  prepare,
execute and file the  certificate of cancellation  with the State  Department of
Assessments  and Taxation of Maryland.  In such event,  Securityholders  will be
entitled to receive out of the assets of the Trust available for distribution to
Securityholders,  after satisfaction of liabilities to creditors of the Trust as
provided by applicable law, an amount equal to the Liquidation  Amount per Trust
Security  plus accrued and unpaid  Distributions  thereon to the date of payment
(such amount being the "Liquidation Distribution"). If, upon any such winding-up
or termination,  the Liquidation  Distribution  can be paid only in part because
the  Trust  has  insufficient  assets  available  to pay in full  the  aggregate
Liquidation  Distribution,  then, subject to the next succeeding  sentence,  the
amounts payable by the Trust on the Trust Securities shall be paid on a pro rata
basis (based upon Liquidation

                                       47
<PAGE>

Amounts).  The  Holder of the  Common  Securities  will be  entitled  to receive
Liquidation  Distributions  upon any such  winding-up  or  termination  pro rata
(determined as aforesaid) with Holders of Preferred Securities,  except that, if
a Indenture  Event of Default has  occurred  and is  continuing,  the  Preferred
Securities shall have a priority over the Common Securities.

         SECTION 9.5 Mergers,  Consolidations  or Replacements of the Trust. The
Trust may not merge with or into,  consolidate,  or be  replaced  by, or convey,
transfer or lease its properties and assets  substantially as an entirety to any
Person,  except  pursuant to this  Section 9.5 or Section 9.4. At the request of
the Sponsor, with the consent of the Regular Trustees and without the consent of
the Property Trustee or the Holders of the Preferred  Securities,  the Trust may
merge with or into, consolidate, be replaced by or convey, transfer or lease its
properties and assets  substantially as an entirety to a trust organized as such
under the laws of any state; provided, that (i) such successor entity either (a)
expressly  assumes  all of the  obligations  of the Trust  with  respect  to the
Preferred  Securities  or (b)  substitutes  for the Preferred  Securities  other
securities having  substantially the same terms as the Preferred Securities (the
"Successor Securities") so long as the Successor Securities rank the same as the
Preferred Securities rank in priority with respect to Distributions and payments
upon liquidation,  redemption and otherwise, (ii) the Sponsor expressly appoints
a trustee of such successor entity  possessing the same powers and duties as the
Property  Trustee  as the  holder of the Debt  Securities,  (iii) the  Successor
Securities  are  listed,  or  any  Successor  Securities  will  be  listed  upon
notification  of  issuance,   on  any  national  securities  exchange  or  other
organization  on which the Preferred  Securities  are then listed,  if any, (iv)
such merger, consolidation,  replacement, conveyance, transfer or lease does not
cause the  Preferred  Securities  (including  any  Successor  Securities)  to be
downgraded by any nationally  recognized  statistical rating  organization,  (v)
such merger, consolidation,  replacement, conveyance, transfer or lease does not
adversely  affect the rights,  preferences  and privileges of the Holders of the
Preferred  Securities  (including  any  Successor  Securities)  in any  material
respect (other than with respect to any dilution of the Holder's interest in the
new entity), (vi) such successor entity has a purpose substantially identical to
that of the  Trust,  (vii)  prior to such  merger,  consolidation,  replacement,
conveyance,  transfer or lease the Sponsor has received an Opinion of Counsel to
the  effect  that  (a)  such  merger,  consolidation,  replacement,  conveyance,
transfer  or  lease  does not  adversely  affect  the  rights,  preferences  and
privileges of the Holders of the Preferred  Securities  (including any Successor
Securities) in any material  respect (other than with respect to any dilution of
the  Holder's   interest  in  the  new  entity),   (b)  following  such  merger,
consolidation,  replacement, conveyance, transfer or lease neither the Trust nor
such  successor  entity will be required  to register as an  investment  company
under the 1940 Act, and (c) following such merger,  consolidation,  replacement,
the Trust or such successor entity will be treated as a grantor trust for United
States  federal  income tax  purposes  and (viii) the  Sponsor or any  permitted
successor or assignee owns, directly or indirectly, all of the common securities
of such successor entity and guarantees the obligations of such successor entity
under the Successor Securities at least to the extent provided by the Guarantee.
Notwithstanding  the foregoing,  the Trust shall not, except with the consent of
Holders of 100% in aggregate  Liquidation  Amount of the  Preferred  Securities,
consolidate, merge with or into, be replaced by or convey, transfer or lease its
properties and assets substantially as an entirety to any other entity or permit
any other  entity to  consolidate,  merge  with or into,  or  replace it if such
consolidation,  merger, replacement,  conveyance,  transfer or lease would cause
the Trust or the successor entity to be classified as other than a grantor trust
for United States federal income tax purposes.

                                       48
<PAGE>

                                   ARTICLE 10
                            MISCELLANEOUS PROVISIONS

SECTION 10.1 Limitation of Rights of Securityholders. Other than as set forth in
Section 9.1, the death,  incapacity,  dissolution,  bankruptcy or termination of
any Person  having an interest,  beneficial or  otherwise,  in Trust  Securities
shall not operate to dissolve the Trust or terminate this Trust  Agreement,  nor
entitle the legal  representatives or heirs of such Person or any Securityholder
for such Person to claim an accounting,  take any action or bring any proceeding
in any court for a partition  or  winding-up  of the  arrangements  contemplated
hereby,  nor otherwise  affect the rights,  obligations  and  liabilities of the
parties hereto or any of them.

         SECTION 10.2 Amendment.

         (a)  This  Trust  Agreement  may be  amended  from  time to time by the
Trustees and the  Sponsor,  without the consent of any  Securityholders,  (i) to
cure any  ambiguity,  correct or supplement  any  provision  herein which may be
inconsistent  with any other provision  herein,  or to make any other provisions
with respect to matters or questions  arising under this Trust Agreement,  which
shall not be  inconsistent  with the other  provisions of this Trust  Agreement,
(ii) to modify,  eliminate or add to any  provisions of this Trust  Agreement to
such extent as shall be  necessary  to ensure that the Trust will be  classified
for United  States  federal  income tax purposes as a grantor trust at all times
that any Trust  Securities are  Outstanding or to ensure that the Trust will not
be required to register  as an  "investment  company"  under the 1940 Act, or be
classified as other than a grantor trust for United  States  federal  income tax
purposes, or (iii) to comply with the requirements of the Commission in order to
effect or maintain the  qualification  of this Trust  Agreement  under the Trust
Indenture Act;  provided,  however,  that in the case of clause (i), such action
shall  not  adversely  affect  in any  material  respect  the  interests  of any
Securityholder,  and any such  amendments of this Trust  Agreement  shall become
effective when notice thereof is given to the Securityholders.

         (b) Except as provided in Section 10.2(c) hereof, any provision of this
Trust  Agreement  may be amended by the  Trustees  and the Sponsor  with (i) the
consent of Holders representing not less than a majority (based upon Liquidation
Amounts) of the Trust Securities then Outstanding, acting as a single class, and
(ii)  receipt by the  Trustees  of an Opinion of Counsel to the effect that such
amendment  or the exercise of any power  granted to the  Trustees in  accordance
with such  amendment  will not affect the Trust's  status as a grantor trust for
United  States  federal  income tax purposes or the Trust's  exemption  from the
status of an "investment company" under the 1940 Act, provided,  however, if any
amendment or proposal that would  adversely  affect the powers,  preferences  or
special  rights  of  the  Trust  Securities,  whether  by way  of  amendment  or
otherwise,  would  adversely  affect only the  Preferred  Securities or only the
Common Securities, then only the affected class will be entitled to vote on such
amendment  or proposal  and such  amendment  or proposal  shall not be effective
except with the  approval of a majority in  Liquidation  Amount of such class of
Trust Securities.

         (c) In  addition to and  notwithstanding  any other  provision  in this
Trust  Agreement,  without the  consent of each  affected  Securityholder  (such
consent being obtained in accordance with Section 6.3 or 6.6 hereof), this Trust
Agreement  may  not be  amended  to (i)  change  the  amount  or  timing  of any
Distribution on the Trust Securities or otherwise adversely

                                       49
<PAGE>

affect  the  amount of any  Distribution  required  to be made in respect of the
Trust  Securities  as of a  specified  date  or (ii)  restrict  the  right  of a
Securityholder  to institute suit for the  enforcement of any such payment on or
after  such  date;  notwithstanding  any other  provision  herein,  without  the
unanimous  consent  of the  Securityholders  (such  consent  being  obtained  in
accordance  with Section 6.3 or 6.6 hereof),  this paragraph (c) of this Section
10.2 may not be amended.

         (d)  Notwithstanding  any other provisions of this Trust Agreement,  no
Trustee  shall enter into or consent to any  amendment  to this Trust  Agreement
which would cause the Trust to fail or cease to qualify for the  exemption  from
the status of an  "investment  company"  under the 1940 Act or be  classified as
other than a grantor trust for United States federal income tax purposes.

         (e)  Notwithstanding  anything in this Trust Agreement to the contrary,
without the consent of the Sponsor, this Trust Agreement may not be amended in a
manner which imposes any additional obligation on the Sponsor.

         (f) In the event that any  amendment  to this Trust  Agreement is made,
the  Regular  Trustees  shall  promptly  provide  to the  Sponsor a copy of such
amendment.

         (g) The  Property  Trustee  shall  not be  required  to enter  into any
amendment  to this Trust  Agreement  which  affects  its own  rights,  duties or
immunities under this Trust Agreement. The Property Trustee shall be entitled to
receive an Opinion of Counsel  and an  Officers'  Certificate  stating  that any
amendment to this Trust Agreement is in compliance with this Trust Agreement and
that all conditions precedent,  if any, in this Trust Agreement to the execution
and delivery of such amendment have been satisfied.

         SECTION  10.3  Separability.  In  case  any  provision  in  this  Trust
Agreement or in the Trust Securities  Certificates shall be invalid,  illegal or
unenforceable,  the  validity,  legality  and  enforceability  of the  remaining
provisions shall not in any way be affected or impaired thereby.

         SECTION 10.4 Governing Law. EXCEPT AS PROVIDED IN SECTION 10.10 HEREOF,
THIS  TRUST   AGREEMENT  AND  THE  RIGHTS  AND   OBLIGATIONS   OF  EACH  OF  THE
SECURITYHOLDERS, THE TRUST AND TRUSTEES WITH RESPECT TO THIS TRUST AGREEMENT AND
THE TRUST  SECURITIES  SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE
LAWS OF THE STATE OF MARYLAND WITHOUT REGARD TO ITS CONFLICT OF LAWS PRINCIPLES.

         SECTION 10.5  Payments Due on  Non-Business  Day. If the date fixed for
any payment on any Trust  Security  shall be a day which is not a Business  Day,
then  such  payment  need  not be made on such  date but may be made on the next
succeeding  day which is a Business Day except as otherwise  provided in Section
4.1(a) and Section 4.2(d),  with the same force and effect as though made on the
date fixed for such payment, and no interest shall accrue thereon for the period
after such date.

         SECTION 10.6 Successors. This Trust Agreement shall be binding upon and
shall inure to the benefit of any  successor  to the  Sponsor,  the Trust or the
Relevant  Trustee,  including  any  successor  by  operation  of law.  Except in
connection with a transaction that is permitted under

                                       50
<PAGE>

Article 8 of the Indenture and pursuant to which the assignee  agrees in writing
to perform the Sponsor's obligations hereunder, the Sponsor shall not assign its
obligations hereunder.

         SECTION  10.7  Headings.  The  Article  and  Section  headings  are for
convenience only and shall not affect the construction of this Trust Agreement.

         SECTION 10.8 Reports,  Notices and Demands. Any report,  notice, demand
or other  communication  which  by any  provision  of this  Trust  Agreement  is
required or permitted to be given or served to or upon any Securityholder or the
Sponsor  may be given or served  in  writing  by  deposit  thereof,  first-class
postage  prepaid,  in  the  United  States  mail,  hand  delivery  or  facsimile
transmission,  in each case, addressed, (a) in the case of a Holder of Preferred
Securities,  to such Holder as such  Holder's name and address may appear on the
Securities Register; and (b) in the case of the Holder of the Common Securities,
to SNH Capital Trust Holdings,  c/o Senior Housing  Properties Trust, 400 Centre
Street, Newton, Massachusetts 02458.

         Any notice,  demand or other  communication  which by any  provision of
this Trust  Agreement  is required or permitted to be given or served to or upon
the Trust,  the  Property  Trustee  or the  Regular  Trustees  shall be given in
writing  addressed (until another address is published by the Trust) as follows:
(a) with  respect  to the  Property  Trustee,  to State  Street  Bank and  Trust
Company, 2 Avenue de Lafayette, Boston, Massachusetts,  02111 Attention: Paul D.
Allen,  Corporate Trust Department and (b) with respect to the Regular Trustees,
to them at the address for notices to the Sponsor, marked "Attention:  Gerard M.
Martin and Barry M. Portnoy.  Such notice,  demand or other  communication to or
upon the Trust or the Property Trustee shall be deemed to have been sufficiently
given or made  only  upon  actual  receipt  of the  writing  by the Trust or the
Property Trustee.

         SECTION 10.9  Agreement  Not to Petition.  Each of the Trustees and the
Sponsor agrees for the benefit of the  Securityholders  that, until at least one
year and one day after the Trust has been  dissolved in accordance  with Article
9, it shall not file,  or join in the filing of, a  petition  against  the Trust
under any Bankruptcy Law or otherwise join in the commencement of any proceeding
against the Trust  under any  Bankruptcy  Law.  In the event the  Sponsor  takes
action in violation of this Section 10.9, the Property  Trustee agrees,  for the
benefit of  Securityholders,  that, at the expense of the Sponsor, it shall file
an answer with the bankruptcy court or otherwise  properly contest the filing of
such  petition by the  Sponsor  against  the Trust or the  commencement  of such
action and raise the defense  that the Sponsor has agreed in writing not to take
such  action  and  should be  stopped  and  precluded  therefrom  and such other
defenses,  if any,  as  counsel  for the  Trustee or the Trust may  assert.  The
provisions  of this Section  10.9 shall  survive the  dissolution  of this Trust
Agreement.

         SECTION 10.10 Trust Indenture Act; Conflict with Trust Indenture Act.

         (a) This Trust  Agreement  is subject  to the  provisions  of the Trust
Indenture Act that are required to be part of this Trust Agreement and shall, to
the extent applicable, be governed by such provisions.

         (b) The Property Trustee shall be the only Trustee which is the trustee
for the purposes of the Trust Indenture Act.

                                       51
<PAGE>

         (c) If any provision hereof limits, qualifies or conflicts with another
provision hereof which is required to be included in this Trust Agreement by any
of the  provisions of the Trust  Indenture  Act, such required  provision  shall
control.  If any  provision  of this Trust  Agreement  modifies or excludes  any
provision of the Trust  Indenture Act which may be so modified or excluded,  the
latter provision shall be deemed to apply to this Trust Agreement as so modified
or to be excluded, as the case may be.

         (d) The  application of the Trust Indenture Act to this Trust Agreement
shall  not  affect  the  nature  of the Trust  Securities  as equity  securities
representing undivided beneficial interests in the assets of the Trust.

         SECTION  10.11  Acceptance of Terms of Trust  Agreement,  Guarantee and
Indenture.  THE  RECEIPT AND  ACCEPTANCE  OF A TRUST  SECURITY  OR ANY  INTEREST
THEREIN BY OR ON BEHALF OF A  SECURITYHOLDER  OR BENEFICIAL  OWNER,  WITHOUT ANY
SIGNATURE OR FURTHER MANIFESTATION OF ASSENT, SHALL CONSTITUTE THE UNCONDITIONAL
ACCEPTANCE BY THE SECURITYHOLDER AND ALL OTHERS HAVING A BENEFICIAL  INTEREST IN
SUCH TRUST SECURITY OF ALL THE TERMS AND PROVISIONS OF THIS TRUST  AGREEMENT AND
AGREEMENT TO  SUBORDINATION  PROVISIONS AND OTHER TERMS OF THE GUARANTEE AND THE
INDENTURE,  AND SHALL CONSTITUTE THE AGREEMENT OF THE TRUST, SUCH SECURITYHOLDER
AND SUCH OTHERS THAT THE TERMS AND PROVISIONS OF THIS TRUST  AGREEMENT  SHALL BE
BINDING,  OPERATIVE  AND  EFFECTIVE  AS THE  AGREEMENT  OF THE  TRUST  AND  SUCH
SECURITYHOLDER AND SUCH OTHERS.

         SECTION 10.12 Counterparts.  This Trust Agreement may contain more than
one  counterpart of the signature page and this Trust  Agreement may be executed
by the  affixing  of the  signature  of  each  of the  Trustees  to one of  such
counterpart  signature pages.  All of such counterpart  signature pages shall be
read as though one,  and they shall have the same force and effect as though all
of the signers had signed a single signature page.

         IN WITNESS WHEREOF, the parties hereto have caused this Trust Agreement
to be duly executed as of the day and year first above written.

                              SNH CAPITAL TRUST HOLDINGS, as Sponsor

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

                                       52
<PAGE>

                              STATE STREET BANK AND TRUST COMPANY, as Property
                              Trustee

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

                              Gerard M. Martin, as Regular Trustee and not
                              individually

                              Barry M. Portnoy, as Regular Trustee and not
                              individually

                                       53
<PAGE>
                                                                       EXHBIIT A

                               SNH CAPITAL TRUST I

                              CERTIFICATE OF TRUST

         THIS IS TO CERTIFY THAT:

         FIRST:  The undersigned  trustees hereby form a business trust pursuant
to the laws of the State of Maryland.

         SECOND:  The name of the business trust (the "Trust") is:

                               SNH Capital Trust I

         THIRD:  The  address of the  Trust's  principal  office in the State of
Maryland is c/o Ballard Spahr Andrews & Ingersoll, LLP, 300 East Lombard Street,
Baltimore, Maryland 21202, Attention: James J. Hanks, Jr.

         FOURTH: The name and business address of the Trust's resident agent are
James J. Hanks,  Jr.,  c/o Ballard  Spahr  Andrews &  Ingersoll,  LLP,  300 East
Lombard Street, Baltimore, Maryland 21202.

         The  undersigned,  being all of the trustees of the Trust,  acknowledge
under the penalties of perjury,  that to the best of their knowledge and belief,
the facts stated herein are true.

         IN WITNESS WHEREOF,  each of the undersigned  trustees have signed this
Certificate of Trust this 4th day of May, 2001.

                              _____________________________
                              Gerard M. Martin

                              _____________________________
                              Barry M. Portnoy

                                      A-1
<PAGE>
                                                                      EXHIBIT B

                Form of Common Securities of SNH Capital Trust I

THIS CERTIFICATE IS NOT TRANSFERABLE  EXCEPT TO AN ENTITY WHOLLY OWNED BY SENIOR
HOUSING  PROPERTIES TRUST OR TO CERTAIN  SUCCESSORS OF SENIOR HOUSING PROPERTIES
TRUST.

              Certificate Number 1 Number of Common Securities ___
                    Certificate Evidencing Common Securities
                                       of
                               SNH Capital Trust I

                            10.125% Common Securities
                 (Liquidation Amount $25.00 per Common Security)

         SNH Capital  Trust I, a business  trust  created  under the laws of the
State of  Maryland  (the  "Trust"),  hereby  certifies  that SNH  Capital  Trust
Holdings,  a business trust created under the laws of the State of Maryland (the
"Holder"),  is the registered  owner of ________ common  securities of the Trust
representing  undivided  beneficial  interests  in the  assets of the Trust (the
"Common Securities"). Except as set forth in Section 5.10 of the Trust Agreement
(as defined below), the Common Securities are not transferable and any attempted
transfer   hereof  shall  be  void.  The   designations,   rights,   privileges,
restrictions,   preferences  and  other  terms  and  provisions  of  the  Common
Securities  are set forth in, and this  certificate  and the  Common  Securities
represented  hereby are issued and shall in all respects be subject to the terms
and provisions  of, the Amended and Restated Trust  Agreement of the Trust dated
as of June 21,  2001,  as the same may be amended  from time to time (the "Trust
Agreement")  including the designation of the terms of the Common  Securities as
set forth therein.  The Trust will furnish a copy of the Trust Agreement and the
Guarantee to the Holder without charge upon written  request to the Trust at its
principal place of business or registered office.

         Upon  receipt  of this  certificate,  the  Holder is bound by the Trust
Agreement and is entitled to the benefits thereunder.

         IN  WITNESS  WHEREOF,  one of the  Regular  Trustees  of the  Trust has
executed this certificate.

Dated:  June __, 2001         SNH CAPITAL TRUST I

                              By: ______________________________________
                              Name:  Barry M. Portnoy
                                     As Regular Trustee and not individually
<PAGE>

                PROPERTY TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This   is  one   of  the   Common   Securities   referred   to  in  the
within-mentioned Trust Agreement.

                              STATE STREET BANK AND TRUST
                                COMPANY, as Property Trustee

                              By:_____________________________________
                                 Name:
                                 Title:

                                      B-2

<PAGE>
                                                                       EXHIBIT C

               Form of Preferred Securities of SNH Capital Trust I

         This   Preferred   Security  is  a  Book-Entry   Preferred   Securities
Certificate  within the meaning of the Trust Agreement  hereinafter  referred to
and is  registered  in the name of The  Depository  Trust  Company  ("DTC") or a
nominee of DTC. This Preferred Security is exchangeable for Preferred Securities
registered  in the name of a person  other than DTC or its  nominee  only in the
limited  circumstances  described in the Trust Agreement and no transfer of this
Preferred  Security (other than a transfer of this Preferred Security as a whole
by DTC to a nominee of DTC or by a nominee  of DTC to DTC or another  nominee of
DTC) may be registered except in limited circumstances.

         Unless this certificate is presented by an authorized representative of
The Depository Trust Company, a New York corporation  ("DTC"),  to Issuer or its
agent for  registration  of transfer,  exchange or payment,  and any certificate
issued  is  registered  in the name of Cede & Co.  or in such  other  name as is
requested  by an  authorized  representative  of DTC (and any payment is made to
Cede  &  Co.  or  to  such  other  entity  as  is  requested  by  an  authorized
representative  of DTC),  ANY TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE  BY OR TO ANY PERSON IS  WRONGFUL  inasmuch  as the  registered  owner
hereof, Cede & Co., has an interest herein.

           Certificate Number ____ Number of Preferred Securities ____
                              CUSIP NO. 78460V 20 9

                   CERTIFICATE EVIDENCING PREFERRED SECURITIES
                                       OF
                               SNH CAPITAL TRUST I

                       10.125% Trust Preferred Securities
               (Liquidation Amount $25.00 per Preferred Security)

         SNH Capital  Trust I, a business  trust  created  under the laws of the
State of  Maryland  (the  "Trust"),  hereby  certifies  that  Cede & Co.  or its
registered assigns (the "Holder") is the registered owner of ___________________
(_______) preferred securities of the Trust representing an undivided beneficial
interest  in the  assets of the Trust and  designated  the SNH  Capital  Trust I
10.125%  Trust  Preferred  Securities  (Liquidation  Amount $25.00 per Preferred
Security) (the  "Preferred  Securities").  Except to the extent set forth in the
Trust Agreement (as defined below), the Preferred Securities are transferable on
the books and records of the Trust, in person or by a duly authorized  attorney,
upon surrender of this certificate duly endorsed and in proper form for transfer
as provided  in Section  5.4 of the Trust  Agreement  (as  defined  below).  The
designations, rights, privileges, restrictions,  preferences and other terms and
provisions of the Preferred  Securities  are set forth in, and this  certificate
and the  Preferred  Securities  represented  hereby  are issued and shall in all
respects be subject to the terms and  provisions  of, the  Amended and  Restated
Trust  Agreement  of the  Trust  dated  as of June  21,  2001 as the same may be
amended from time to time (the "Trust  Agreement")  including the designation of
the terms of Preferred  Securities as set forth therein.  The Holder is entitled
to the  benefits  of the  Guarantee  Agreement  entered  into by Senior  Housing
Properties Trust, a Maryland real estate
<PAGE>

investment trust, and State Street Bank and Trust Company, as Guarantee Trustee,
dated as of June 21, 2001 (the "Guarantee"), to the extent provided therein. The
Trust will furnish a copy of the Trust Agreement and the Guarantee to the Holder
without  charge  upon  written  request to the Trust at its  principal  place of
business or registered office.

         Upon  receipt  of this  certificate,  the  Holder is bound by the Trust
Agreement and is entitled to the benefits thereunder.

         IN  WITNESS  WHEREOF,  one of the  Regular  Trustees  of the  Trust has
executed this certificate.

Dated:  June __, 2001         SNH CAPITAL TRUST I

                              By: ______________________________
                              Name: Barry M. Portnoy
                                    As Regular Trustee and not individually

                                      C-2

<PAGE>

                PROPERTY TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This  is  one  of  the   Preferred   Securities   referred  to  in  the
within-mentioned Trust Agreement.

                              STATE STREET BANK AND TRUST
                                COMPANY, as Property Trustee

                              By:  ______________________________
                                   Name:
                                   Title:

                                      C-3
<PAGE>

                                   ASSIGNMENT

         FOR  VALUE  RECEIVED,   the  undersigned  assigns  and  transfers  this
Preferred Security to:

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________
(Insert assignee's social security or tax identification number)

______________________________________________________________________________

______________________________________________________________________________
(Insert address and zip code of assignee)

and irrevocably appoints

______________________________________________________________________________

______________________________________________________________________________
agent to transfer  this  Preferred  Securities  Certificate  on the books of the
Trust. The agent may substitute another to act for him or her.

Date:  __________________________

Signature:  ______________________

(Sign  exactly  as your  name  appears  on the  other  side  of  this  Preferred
Securities Certificate)

                                      C-4
<PAGE>

                     [TO BE ATTACHED TO GLOBAL CERTIFICATE]

                                   SCHEDULE A

         The  initial  Liquidation  Amount of this Global  Certificate  shall be
$25,000,000.  The following  increases or decreases in the Liquidation Amount of
this Global Certificate have been made:
<TABLE>
<CAPTION>

                          Amount of Increase
                          in Liquidation
                          Amount of This                                 Liquidation Amount
                          Global Certificate     Amount of Decrease in   of this Global         Signature of
                          Including Upon         Liquidation Amount of   Certificate            Authorized Officer
                          Exercise of            this Global             Following such         of Trustee or
Date Made                 Over-Allotment Option  Certificate             Decrease or Increase   Securities Custodian
---------------------------------------------------------------------------------------------------------------------
<S>                      <C>                      <C>                     <C>                     <C>

</TABLE>

                                      C-5EXHBIIT 4.19

                                    FORM OF

                               GUARANTEE AGREEMENT

                                     between

                         SENIOR HOUSING PROPERTIES TRUST

                                       and

                       STREET STATE BANK AND TRUST COMPANY

                     Relating to the Preferred Securities of
                               SNH CAPITAL TRUST I

                            Dated as of June 21, 2001

<PAGE>

    Certain Sections of this Agreement relating to Sections 310 through 318,
                 inclusive, of the Trust Indenture Act of 1939:

Trust Indenture
  Act Section                                                  Agreement Section

ss.310(a)(1)................................................................4.1
      (a)(2)................................................................4.1
      (a)(3).....................................................Not Applicable
      (a)(4).....................................................Not Applicable
      (a)(5)................................................................4.1
      (b)..............................................................2.8, 4.1
      (c)........................................................Not Applicable
ss.311(a)...................................................................2.2
      (b)...................................................................2.2
      (c)........................................................Not Applicable
ss.312......................................................................2.2
ss.313......................................................................2.3
ss.314(a)...................................................................2.4
      (b)........................................................Not Applicable
      (c)...................................................................2.5
      (d)........................................................Not Applicable
      (e)...................................................................1.1
ss.315(a)..............................................................3.1, 3.2
      (b)...................................................................2.7
      (c)...................................................................3.1
      (d)...................................................................3.2
ss.316(a)(1)(A).............................................................5.4
      (a)(1)(B).............................................................2.6
      (a)(2).....................................................Not Applicable
      (b)...................................................................5.4
      (c)........................................................Not Applicable
ss.317......................................................................2.1
ss.318......................................................................2.1

----------------------
         NOTE: This reconciliation and tie shall not, for any purpose, be deemed
to be part of the Agreement.

<PAGE>

                               GUARANTEE AGREEMENT

This GUARANTEE  AGREEMENT,  dated as of June 21, 2001, is executed and delivered
by SENIOR HOUSING PROPERTIES TRUST, a Maryland real estate investment trust (the
"Guarantor")  and STATE STREET BANK AND TRUST  COMPANY,  a  Massachusetts  trust
company,  as trustee (the "Guarantee  Trustee"),  for the benefit of the Holders
(as defined  herein) from time to time of the Preferred  Securities  (as defined
herein)  of SNH  Capital  Trust I, a  Maryland  statutory  business  trust  (the
"Issuer").

         WHEREAS,  pursuant  to an Amended and  Restated  Trust  Agreement  (the
"Trust Agreement"), dated as of June 21, 2001, among the Trustees named therein,
the  Guarantor,  as  Depositor,  and the Holders  from time to time of undivided
beneficial  interests  in the assets of the Issuer,  the Issuer is issuing up to
$28,750,000 of its 10.125% Trust Preferred Securities (liquidation amount $25.00
per preferred  security) (the  "Preferred  Securities")  representing  preferred
undivided  beneficial interests in the assets of the Issuer and having the terms
set forth in the Trust Agreement;

         WHEREAS,  the Preferred Securities will be issued by the Issuer and the
proceeds  thereof,  together with the proceeds from the issuance of the Issuer's
Common  Securities  (as  defined  below),  will  be used to  purchase  the  Debt
Securities  (as defined in the Trust  Agreement) of the Guarantor  which will be
deposited  with State Street Bank and Trust Company,  as Property  Trustee under
the Trust Agreement, as trust assets; and

         WHEREAS, as incentive for the Holders to purchase Preferred Securities,
the Guarantor desires  irrevocably and  unconditionally  to agree, to the extent
set  forth  herein,  to pay to the  Holders  of  the  Preferred  Securities  the
Guarantee Payments (as defined herein) and to make certain other payments on the
terms and conditions set forth herein;

         NOW,  THEREFORE,  in  consideration  of the  purchase by each Holder of
Preferred  Securities,  which purchase the Guarantor hereby agrees shall benefit
the Guarantor,  the Guarantor executes and delivers this Guarantee Agreement for
the benefit of the Holders from time to time of the Preferred Securities.

                                   ARTICLE I

                                   DEFINITIONS

         SECTION 1.1 Definitions. As used in this Guarantee Agreement, the terms
set forth below shall, unless the context otherwise requires, have the following
meanings.  Capitalized or otherwise defined terms used but not otherwise defined
herein shall have the meanings  assigned to such terms in the Trust Agreement as
in effect on the date hereof.

         "Additional Sums" means such additional  amounts as may be necessary in
order  that the  amount of  distributions  due and  payable by the Issuer on the
Preferred  Securities and Common Securities that at any time remain  outstanding
in  accordance  with the terms  thereof  shall not be reduced as a result of any
additional taxes, duties, assessments and other governmental charges of whatever
nature,  imposed by the United States  government or any other taxing  authority
(but
<PAGE>

not including  withholding taxes imposed on holders of such Preferred Securities
and Common Securities).

         "Affiliate" of any specified  Person means any other Person directly or
indirectly controlling or controlled by or under direct common control with such
specified Person;  provided,  however,  that an Affiliate of the Guarantor shall
not be deemed to  include  the  Issuer.  For the  purposes  of this  definition,
"control"  when used with  respect to any  specified  Person  means the power to
direct the  management  and  policies of such  Person,  directly or  indirectly,
whether  through the ownership of voting  securities,  by contract or otherwise;
and the terms  "controlling" and "controlled"  have meanings  correlative to the
foregoing.

         "Common Securities" means the securities representing common beneficial
interests in the assets of the Issuer.

         "Debentures" means up to $29,639,200 of the 10.125% Junior Subordinated
Debentures  due  June  15,  2041  of  the  Guarantor  issuable  pursuant  to the
Indenture.

         "Event of  Default"  means a  default  by the  Guarantor  on any of its
payment or other obligations under this Guarantee Agreement;  provided, however,
that, except with respect to a default in payment of any Guarantee Payments,  no
Event of Default shall be deemed to have occurred under this Guarantee Agreement
unless and until the  Guarantor  shall have received  written  notice of default
from the Guarantee  Trustee and shall not have cured such default within 60 days
after receipt of such notice.

         "Guarantee  Payments"  means the following  payments or  distributions,
without duplication, with respect to the Preferred Securities, to the extent not
paid or made by or on behalf  of the  Issuer:  (i) any  accumulated  and  unpaid
Distributions  (as  defined in the Trust  Agreement)  required to be paid on the
Preferred Securities,  to the extent the Issuer shall have funds on hand legally
available  therefor  at such time,  (ii) the  redemption  price set forth in the
Trust Agreement, including premium, if any, all accrued and unpaid Distributions
to the  date  of  redemption  (the  "Redemption  Price"),  with  respect  to the
Preferred  Securities  called  for  redemption  by the  Issuer to the extent the
Issuer shall have funds on hand  legally  available  therefor,  and (iii) upon a
voluntary or involuntary  dissolution,  winding-up or liquidation of the Issuer,
other than in connection with the distribution of Debt Securities to the Holders
or the redemption of all Preferred  Securities issued by the Issuer,  the lesser
of (a) the aggregate of the liquidation  amount of $25.00 per Preferred Security
plus accrued and unpaid Distributions on the Preferred Securities to the date of
payment to the extent the Issuer shall have funds on hand  legally  available to
make such payment and (b) the amount of assets of the Issuer remaining available
for  distribution  to Holders in  liquidation of the Issuer (in either case, the
"Liquidation Distribution").

         "Guarantee Trustee" means State Street Bank and Trust Company,  until a
Successor Guarantee Trustee has been appointed and has accepted such appointment
pursuant to the terms of this Guarantee Agreement and thereafter means each such
Successor Guarantee Trustee.

         "Holder"  means any holder,  as  registered on the books and records of
the Issuer, of any Preferred Securities;  provided, however, that in determining
whether the holders of the  requisite

                                      -2-
<PAGE>

percentage of Preferred  Securities have given any request,  notice,  consent or
waiver  hereunder,  "Holder"  shall not include  the  Guarantor,  the  Guarantee
Trustee or any Affiliate of the Guarantor or the Guarantee Trustee.

         "Indenture"  means the Junior  Subordinated  Indenture dated as of June
21, 2001 with respect to the Debt  Securities,  between the  Guarantor and State
Street Bank and Trust Company,  as trustee,  as the same may be supplemented and
amended from time to time.

         "List of Holders" has the meaning specified in Section 2.2(a).

         "Majority in Liquidation  Amount of the  Securities"  means,  except as
provided by the Trust Indenture Act, a vote by the Holder(s),  voting separately
as a class,  of more  than 50% of the  aggregate  liquidation  amount of all the
outstanding Preferred Securities issued by the Issuer.

         "Officers'   Certificate"   means,   with  respect  to  any  Person,  a
certificate  signed by (i) the  Chairman  of the Board,  a Vice  Chairman of the
Board, the Chief Executive Officer,  the Chief Operating Officer,  the President
or a Vice President,  and (ii) the Chief Financial  Officer,  the Treasurer,  an
Assistant Treasurer, the Controller,  the Secretary or an Assistant Secretary of
such Person,  delivered to the  Guarantee  Trustee.  Any  Officer's  Certificate
delivered with respect to compliance  with a condition or covenant  provided for
in this Guarantee Agreement shall include:

         (a) a statement that each officer signing the Officers' Certificate has
read the covenant or condition and the definitions relating thereto;

         (b) a brief  statement  of the nature and scope of the  examination  or
investigation undertaken by each officer in rendering the Officers' Certificate;

         (c) a statement  that each such  officer has made such  examination  or
investigation as, in such officer's opinion, is necessary to enable such officer
to express an informed  opinion as to whether or not such  covenant or condition
has been complied with; and

         (d) a  statement  as to whether,  in the opinion of each such  officer,
such condition or covenant has been complied with.

         "Person" means a legal person,  including any individual,  corporation,
estate, partnership,  joint venture,  association,  joint stock company, limited
liability  company,  trust,  unincorporated  association,  or  government or any
agency or political subdivision thereof, or any other entity of whatever nature.

         "Property  Trustee" means State Street Bank and Trust Company,  serving
as property trustee under the Indenture.

         "Responsible Officer", when used with respect to the Guarantee Trustee,
means the chairman or any vice-chairman of the board of directors,  the chairman
or any vice-chairman of the executive  committee of the board of directors,  the
chairman  of the  trust  committee,  the  president,  any  vice  president,  the
secretary,  any assistant secretary, the treasurer, any assistant treasurer, the
cashier,  any assistant  cashier,  any trust officer or assistant trust officer,
the controller or any assistant controller or any other officer of the Guarantee
Trustee  customarily

                                      -3-
<PAGE>

performing  functions  similar to those performed by any of the above designated
officers and also means,  with respect to a particular  corporate  trust matter,
any other  officer to whom such matter is referred  because of his  knowledge of
and familiarity with the particular subject.

         "Senior  Indebtedness of the Guarantor"  means (i) any  indebtedness of
the  Guarantor  for borrowed or  purchased  money,  whether or not  evidenced by
bonds, debentures,  notes or other written instruments,  (ii) obligations of the
Guarantor  for  reimbursement  under  letters of credit,  banker's  acceptances,
security purchase facilities or similar facilities issued for the account of the
Guarantor,  (iii) any  indebtedness  or other  obligations of the Guarantor with
respect to commodity  contracts  (including  but not limited to contracts in the
spot,  forward and markets,  options,  and contracts for differences),  interest
rate commodity and currency swap agreements,  cap, floor and collar  agreements,
currency  spot  and  forward   contracts,   and  other  similar   agreements  or
arrangements  designed to protect  against  fluctuations  in  commodity  prices,
currency  exchange  or interest  rates,  and (iv) any  guarantees,  endorsements
(other than by  endorsement  of  negotiable  instruments  for  collection in the
ordinary course of business) or other similar contingent  obligations in respect
of  obligations  of  others of a type  described  in (i),  (ii) or (iii)  above,
whether or not such  obligation  is classified as a liability on a balance sheet
prepared in accordance with generally accepted  accounting  principles,  in each
case listed in (i), (ii),  (iii) and (iv) above whether  outstanding on the date
of execution of this Indenture or thereafter  incurred,  other than  obligations
ranking  on a parity  with the  Guarantee  Payments  or  ranking  junior  to the
Guarantee  Payments;   provided,  however,  that  "Senior  Indebtedness  of  the
Guarantor" does not include obligations to trade creditors.

         "Subsidiary"  means any  corporation (or the equivalent type of entity)
more than 50% of the outstanding  voting securities of which is owned,  directly
or indirectly, by the Guarantor or by one or more other Subsidiaries,  or by the
Guarantor  and  one or  more  other  Subsidiaries.  For  the  purposes  of  this
definition,  "voting  securities"  means securities which ordinarily have voting
power for the election of directors or trustees, whether at all times or only so
long as no senior  class of  securities  has such voting  power by reason of any
contingency.

         "Successor  Guarantee  Trustee"  means a  successor  Guarantee  Trustee
possessing the qualifications to act as Guarantee Trustee under Section 4.1.

         "Trust  Indenture  Act"  means  the  Trust  Indenture  Act of 1939,  as
amended.

                                   ARTICLE II

                               TRUST INDENTURE ACT

         SECTION  2.1  Trust  Indenture  Act;  Application.  (a) This  Guarantee
Agreement  is  subject to the  provisions  of the Trust  Indenture  Act that are
required  to be  part of this  Guarantee  Agreement  and  shall,  to the  extent
applicable, be governed by such provisions.

         (b) If and to the extent that any provision of this Guarantee Agreement
limits,  qualifies or conflicts  with the duties imposed by Sections 310 to 317,
inclusive, of the Trust Indenture Act, such imposed duties shall control.

                                      -4-
<PAGE>

         SECTION 2.2 List of Holders.  (a) The Guarantor  shall furnish or cause
to be furnished to the Guarantee Trustee (unless the Guarantee Trustee is acting
as Security  Registrar with respect to the Debt Securities  under the Indenture)
(i)  semi-annually,  not later than January 15 and July 15 in each year, a list,
in such form as the Guarantee  Trustee may  reasonably  require of the names and
addresses of the Holders ("List of Holders") as of the preceding  December 31 or
June 30,  as the case may be,  and  (ii) at such  other  times as the  Guarantee
Trustee  may  request  in  writing,  within  30 days  after the  receipt  by the
Guarantor of any such  request,  a List of Holders as of a date not more than 15
days prior to the time such list is  furnished,  in each case to the extent such
information  is in  the  possession  or  control  of  the  Guarantor  and is not
identical to a previously  supplied  list of Holders or has not  otherwise  been
received by the Guarantee Trustee.  Notwithstanding the foregoing, the Guarantor
shall not be obligated to provide such List of Holders at any time the Preferred
Securities are  represented by one or more Global  Securities (as defined in the
Indenture).  The  Guarantee  Trustee may destroy any List of Holders  previously
given to it on receipt of a new List of Holders.

         (b) The  Guarantee  Trustee  shall  comply with its  obligations  under
Section 311(a), Section 311(b) and Section 312(b) of the Trust Indenture Act.

         SECTION 2.3 Reports by the Guarantee Trustee.  Within 60 days of May 15
of each calendar year,  the Guarantee  Trustee shall provide to the Holders such
reports as are  required by Section 313 of the Trust  Indenture  Act, if any, in
the form and in the manner  provided by Section 313 of the Trust  Indenture Act.
The Guarantee  Trustee shall also comply with the requirements of Section 313(d)
of the Trust Indenture Act.

         SECTION 2.4 Periodic Reports to Guarantee Trustee.  The Guarantor shall
provide to the Guarantee Trustee, the Securities and Exchange Commission and the
Holders such documents,  reports and information, if any, as required by Section
314 of the  Trust  Indenture  Act and the  compliance  certificate  required  by
Section  314 of the Trust  Indenture  Act in the form,  in the manner and at the
times required by Section 314 of the Trust Indenture Act.

         SECTION 2.5  Evidence of  Compliance  with  Conditions  Precedent.  The
Guarantor  shall  provide to the  Guarantee  Trustee such evidence of compliance
with such conditions precedent, if any, provided for in this Guarantee Agreement
that  relate  to any of the  matters  set forth in  Section  314(c) of the Trust
Indenture  Act. Any  certificate  or opinion  required to be given by an officer
pursuant  to  Section  314(c)(1)  may be  given  in  the  form  of an  Officers'
Certificate.

         SECTION  2.6 Events of  Default;  Waiver.  The Holders of a Majority in
Liquidation  Amount of the  Securities  may, by vote,  on behalf of the Holders,
waive any past  default  or Event of  Default  and its  consequences.  Upon such
waiver,  any such  default or Event of  Default  shall  cease to exist,  and any
default  or Event of  Default  arising  therefrom  shall be  deemed to have been
cured, for every purpose of this Guarantee  Agreement,  but no such waiver shall
extend to any  subsequent  or other  default  or Event of  Default or impair any
right consequent therefrom.

         SECTION 2.7 Event of Default;  Notice. (a) The Guarantee Trustee shall,
within 90 days after the  occurrence  of an Event of Default,  transmit by mail,
first class postage  prepaid,  to the Holders,  notices of all Events of Default
known to the Guarantee Trustee,  unless such defaults have been cured before the
giving of such notice;  provided,  that,  except in the case of a

                                      -5-
<PAGE>

default in the payment of a Guarantee  Payment,  the Guarantee  Trustee shall be
protected in  withholding  such notice if and so long as the Board of Directors,
the executive  committee or a trust  committee of directors  and/or  Responsible
Officers of the Guarantee  Trustee in good faith determines that the withholding
of such notice is in the interests of the Holders.

         (b) The Guarantee  Trustee shall not be deemed to have knowledge of any
Event of Default  unless the  Guarantee  Trustee  shall  have  received  written
notice,  or a Responsible  Officer charged with the  administration of the Trust
Agreement shall have obtained written notice, of such Event of Default.

         SECTION  2.8  Conflicting  Interests.   The  Trust  Agreement  and  the
Indenture  shall  be  deemed  to be  specifically  described  in this  Guarantee
Agreement  for the  purposes  of clause (i) of the first  proviso  contained  in
Section 310(b) of the Trust Indenture Act.

                                  ARTICLE III

               POWERS, DUTIES AND RIGHTS OF THE GUARANTEE TRUSTEE

         SECTION  3.1  Powers  and  Duties of the  Guarantee  Trustee.  (a) This
Guarantee  Agreement  shall be held by the Guarantee  Trustee for the benefit of
the  Holders,  and the  Guarantee  Trustee  shall not  transfer  this  Guarantee
Agreement to any Person except a Holder exercising his or her rights pursuant to
Section  5.4(iv)  or to a  Successor  Guarantee  Trustee on  acceptance  by such
Successor  Guarantee  Trustee of its  appointment to act as Successor  Guarantee
Trustee.   The  right,  title  and  interest  of  the  Guarantee  Trustee  shall
automatically vest in any Successor  Guarantee Trustee,  upon acceptance by such
Successor Guarantee Trustee of its appointment  hereunder,  and such vesting and
cessation of title shall be effective whether or not conveyancing documents have
been  executed  and  delivered  pursuant to the  appointment  of such  Successor
Guarantee Trustee.

         (b) If an Event of Default actually known to the Responsible Officer of
the Guarantee  Trustee has occurred and is  continuing,  the  Guarantee  Trustee
shall enforce this Guarantee Agreement for the benefit of the Holders.

         (c) The  Guarantee  Trustee,  before  the  occurrence  of any  Event of
Default  and after the curing of all Events of Default  that may have  occurred,
shall  undertake  to perform only such duties as are  specifically  set forth in
this  Guarantee  Agreement,  and no  implied  covenants  shall be read into this
Guarantee  Agreement against the Guarantee Trustee.  In case an Event of Default
has occurred (that has not been cured or waived  pursuant to Section 2.6) and is
actually  known  to the  Responsible  Officer  of  the  Guarantee  Trustee,  the
Guarantee  Trustee shall  exercise such of the rights and powers vested in it by
this  Guarantee  Agreement,  and use the same  degree  of care and  skill in its
exercise  thereof,  as  a  prudent  person  would  exercise  or  use  under  the
circumstances in the conduct of his or her own affairs.

         (d) No  provision  of this  Guarantee  Agreement  shall be construed to
relieve the Guarantee Trustee from liability for its own negligent  action,  its
own negligent failure to act or its own willful misconduct, except that:

                                      -6-
<PAGE>

                  (i) prior to the  occurrence of any Event of Default and after
         the  curing or  waiving  of all such  Events of  Default  that may have
         occurred;

                           (A)  the  duties  and  obligations  of the  Guarantee
                  Trustee shall be determined  solely by the express  provisions
                  of this Guarantee  Agreement,  and the Guarantee Trustee shall
                  not be liable  except for the  performance  of such duties and
                  obligations  as are  specifically  set forth in this Guarantee
                  Agreement; and

                           (B) in the  absence  of bad  faith on the part of the
                  Guarantee  Trustee,  the  Guarantee  Trustee may  conclusively
                  rely, as to the truth of the statements and the correctness of
                  the  opinions  expressed  therein,  upon any  certificates  or
                  opinions  furnished to the Guarantee Trustee and conforming to
                  the requirements of this Guarantee Agreement;  but in the case
                  of any such  certificates  or opinions  that by any  provision
                  hereof or of the Trust Indenture Act are specifically required
                  to be  furnished  to  the  Guarantee  Trustee,  the  Guarantee
                  Trustee shall be under a duty to examine the same to determine
                  whether  or not  they  conform  to the  requirements  of  this
                  Guarantee Agreement;

                  (ii) the  Guarantee  Trustee shall not be liable for any error
         of  judgment  made  in  good  faith  by a  Responsible  Officer  of the
         Guarantee Trustee, unless it shall be proved that the Guarantee Trustee
         was  negligent  in  ascertaining  the  pertinent  facts upon which such
         judgment was made;

                  (iii) the  Guarantee  Trustee shall not be liable with respect
         to any  action  taken or  omitted  to be  taken by it in good  faith in
         accordance  with  the  direction  of the  Holders  of not  less  than a
         Majority in Liquidation Amount of the Securities  relating to the time,
         method and place of conducting any proceeding for any remedy  available
         to the Guarantee  Trustee,  or exercising any trust or power  conferred
         upon the Guarantee Trustee under this Guarantee Agreement; and

                  (iv) no provision of this  Guarantee  Agreement  shall require
         the  Guarantee  Trustee  to expend  or risk its own funds or  otherwise
         incur  personal  financial  liability in the  performance of any of its
         duties  or in the  exercise  of any of its  rights  or  powers,  if the
         Guarantee Trustee shall have reasonable  grounds for believing that the
         repayment of such funds or liability  is not  reasonably  assured to it
         under the  terms of this  Guarantee  Agreement  or  adequate  indemnity
         against such risk or liability is not reasonably assured to it.

         SECTION 3.2 Certain  Rights of  Guarantee  Trustee.  (a) Subject to the
provisions of Section 3.1:

                  (i)  The  Guarantee  Trustee  may  rely  and  shall  be  fully
         protected  in acting or  refraining  from acting  upon any  resolution,
         certificate,  statement,  proxy,  instrument,  opinion, report, notice,
         request,  direction,  consent,  order,  bond,  debenture,  note,  other
         evidence of indebtedness  or other paper or document  believed by it to
         be genuine and to have been  signed,  sent or  presented  by the proper
         party or parties.

                                      -7-
<PAGE>

                  (ii) Any  direction or act of the  Guarantor  contemplated  by
         this  Guarantee  Agreement  shall  be  sufficiently   evidenced  by  an
         Officers' Certificate unless otherwise prescribed herein.

                  (iii)  Whenever,  in  the  administration  of  this  Guarantee
         Agreement,  the Guarantee Trustee shall deem it desirable that a matter
         be proved or established  before taking,  suffering or omitting to take
         any action  hereunder,  the Guarantee Trustee (unless other evidence is
         herein specifically prescribed) may, in the absence of bad faith on its
         part,  request  and rely  upon an  Officers'  Certificate  which,  upon
         receipt of such request from the Guarantee  Trustee,  shall be promptly
         delivered by the Guarantor.

                  (iv) The Guarantee Trustee may consult with legal counsel, and
         the written  advice or opinion of such legal  counsel  with  respect to
         legal matters shall be full and complete  authorization  and protection
         in respect of any action  taken,  suffered or omitted to be taken by it
         hereunder in good faith and in accordance  with such advice or opinion.
         Such legal  counsel may be legal counsel to the Guarantor or any of its
         Affiliates and may be one of its employees. The Guarantee Trustee shall
         have  the  right  at any  time  to  seek  instructions  concerning  the
         administration of this Guarantee  Agreement from any court of competent
         jurisdiction.

                  (v) The  Guarantee  Trustee  shall be under no  obligation  to
         exercise  any of the  rights or powers  vested in it by this  Guarantee
         Agreement at the request or direction of any Holder, unless such Holder
         shall have provided to the Guarantee Trustee such adequate security and
         indemnity as would  satisfy a reasonable  person in the position of the
         Guarantee Trustee,  against the costs,  expenses (including  attorneys'
         fees and  expenses)  and  liabilities  that might be  incurred by it in
         complying  with such request or direction,  including  such  reasonable
         advances as may be requested by the  Guarantee  Trustee;  provided that
         nothing  contained in this Section  3.2(a)(v) shall be taken to relieve
         the Guarantee Trustee,  upon the occurrence of an Event of Default,  of
         its  obligation  to exercise the rights and powers vested in it by this
         Guarantee  Agreement  and use the same  degree of care and skill in the
         exercise  thereof as a prudent  person would  exercise or use under the
         circumstances in the conduct of his or her own affairs.

                  (vi)  The  Guarantee  Trustee  shall  not be bound to make any
         investigation  into the  facts or  matters  stated  in any  resolution,
         certificate,  statement,  instrument, opinion, report, notice, request,
         direction,  consent,  order, bond,  debenture,  note, other evidence of
         indebtedness or other paper or document,  but the Guarantee Trustee, in
         its  discretion,  may make such further inquiry or  investigation  into
         such facts or matters as it may see fit.

                  (vii) The  Guarantee  Trustee may execute any of the trusts or
         powers  hereunder or perform any duties hereunder either directly or by
         or through its agents or attorneys or any Affiliate,  and the Guarantee
         Trustee shall not be

                                      -8-
<PAGE>

         responsible  for any  misconduct  or negligence on the part of any such
         agent or attorney appointed with due care by it hereunder.

                  (viii)  Whenever  in  the  administration  of  this  Guarantee
         Agreement  the  Guarantee  Trustee  shall deem it  desirable to receive
         instructions  with respect to  enforcing  any remedy or right or taking
         any other  action  hereunder,  the  Guarantee  Trustee  (A) may request
         instructions  from the Holders of a Majority in  Liquidation  Amount of
         the Securities,  (B) may refrain from enforcing such remedy or right or
         taking such other action until such instructions are received,  and (C)
         shall be protected in acting in accordance with such instructions.

                  (ix) Any action taken by the  Guarantee  Trustee or its agents
         hereunder  shall bind the Holders,  and the  signature of the Guarantee
         Trustee  or its agents  alone  shall be  sufficient  and  effective  to
         perform any such action. No third party shall be required to inquire as
         to  the  authority  of  the  Guarantee  Trustee  to so act or as to its
         compliance  with any of the  terms  and  provisions  of this  Guarantee
         Agreement  both  of  which  shall  be  conclusively  evidenced  by  the
         Guarantee Trustee's or its agent's taking such action.

         (b) No provision of this Guarantee  Agreement shall be deemed to impose
any duty or obligation  on the  Guarantee  Trustee to perform any act or acts or
exercise any right, power, duty or obligation  conferred or imposed on it in any
jurisdiction  in which it shall be illegal,  or in which the  Guarantee  Trustee
shall be  unqualified  or  incompetent  in accordance  with  applicable  law, to
perform  any such act or acts or to  exercise  any such  right,  power,  duty or
obligation.  No permissive power or authority available to the Guarantee Trustee
shall  be  construed  to be a duty to act in  accordance  with  such  power  and
authority.

         SECTION 3.3 Indemnity.  The Guarantor agrees to indemnify the Guarantee
Trustee for,  and to hold it harmless  against,  any loss,  liability or expense
incurred without  negligence or bad faith on the part of the Guarantee  Trustee,
arising out of or in connection  with the acceptance or  administration  of this
Guarantee  Agreement,  including the reasonable  costs and expenses of defending
itself  against  any claim or  liability  in  connection  with the  exercise  or
performance of any of its powers or duties hereunder. The Guarantee Trustee will
not claim or exact any lien or charge on any  Guarantee  Payment  as a result of
any amount due to it under this Guarantee Agreement.

                                   ARTICLE IV

                                GUARANTEE TRUSTEE

         SECTION  4.1  Guarantee  Trustee;  Eligibility.  (a) There shall at all
times be a Guarantee Trustee which shall:

                  (i) not be an Affiliate of the Guarantor; and

                  (ii)  be a  Person  that is  eligible  pursuant  to the  Trust
         Indenture Act to act as such and has a combined  capital and surplus of
         at  least  $50,000,000,   and

                                      -9-
<PAGE>

         shall be a corporation  meeting the  requirements  of Section 310(a) of
         the Trust  Indenture  Act.  If such  corporation  publishes  reports of
         condition at least annually,  pursuant to law or to the requirements of
         the supervising or examining authority,  then, for the purposes of this
         Section and to the extent  permitted  by the Trust  Indenture  Act, the
         combined capital and surplus of such corporation  shall be deemed to be
         its combined capital and surplus as set forth in its most recent report
         of condition so published.

         (b) If at any time the Guarantee  Trustee shall cease to be eligible to
so act under Section 4.1(a),  the Guarantee Trustee shall immediately  resign in
the manner and with the effect set out in Section 4.2(c).

         (c) If the  Guarantee  Trustee has or shall  acquire  any  "conflicting
interest"  within the meaning of Section 310(b) of the Trust  Indenture Act, the
Guarantee Trustee and Guarantor shall in all respects comply with the provisions
of  Section  310(b) of the Trust  Indenture  Act.  The Trust  Agreement  and the
Indenture  shall  not be  deemed  to  constitute  conflicting  interests  of the
Guarantee Trustee.

         SECTION 4.2  Appointment,  Removal  and  Resignation  of the  Guarantee
Trustee. (a) Subject to Section 4.2(b) the Guarantee Trustee may be appointed or
removed without cause at any time by the Guarantor.

         (b) The  Guarantee  Trustee  shall not be  removed in  accordance  with
Section  4.2(a) until a Successor  Guarantee  Trustee has been appointed and has
accepted  such  appointment  by written  instrument  executed by such  Successor
Guarantee Trustee and delivered to the Guarantor.

         (c) The  Guarantee  Trustee  appointed to office  hereunder  shall hold
office until a Successor  Guarantee  Trustee shall have been  appointed or until
its  removal or  resignation.  The  Guarantee  Trustee  may resign  from  office
(without  need for prior or subsequent  accounting)  by an instrument in writing
executed  by  the  Guarantee  Trustee  and  delivered  to the  Guarantor,  which
resignation  shall not take effect until a Successor  Guarantee Trustee has been
appointed and has accepted such appointment by an instrument in writing executed
by such  Successor  Guarantee  Trustee and  delivered to the  Guarantor  and the
resigning Guarantee Trustee.

         (d) If no Successor  Guarantee  Trustee  shall have been  appointed and
accepted  appointment  as  provided  in this  Section  4.2  within 60 days after
delivery  to the  Guarantor  of an  instrument  of  resignation,  the  resigning
Guarantee  Trustee may petition,  at the expense of the Guarantor,  any court of
competent  jurisdiction for appointment of a Successor  Guarantee Trustee.  Such
court may  thereupon,  after  prescribing  such  notice,  if any, as it may deem
proper, appoint a Successor Guarantee Trustee.

                                      -10-
<PAGE>

                                   ARTICLE V

                                    GUARANTEE

         SECTION 5.1 Guarantee.  The Guarantor  irrevocably and  unconditionally
agrees,  subject to Section 5.8 and Article 8, to pay in full to the Holders the
Guarantee  Payments  (without  duplication of amounts  theretofore paid by or on
behalf of the Issuer),  as and when due,  regardless  of any  defense,  right of
set-off or  counter  claim  which the  Issuer may have or assert  other than the
defense of payment.  The Guarantor's  obligation to make a Guarantee Payment may
be satisfied by direct  payment of the required  amounts by the Guarantor to the
Holders  or by  causing  the  Issuer to pay such  amounts  to the  Holders.  The
Guarantor's  obligations  to make  Guarantee  Payments are not guaranteed by the
Guarantor's Subsidiaries.

         SECTION 5.2 Waiver of Notice and Demand.  The  Guarantor  hereby waives
notice of acceptance of the Guarantee Agreement and of any liability to which it
applies or may apply,  presentment,  demand for payment,  any right to require a
proceeding  first  against the  Guarantee  Trustee,  Issuer or any other  Person
before proceeding against the Guarantor,  protest, notice of nonpayment,  notice
of dishonor, notice of redemption and all other notices and demands.

         SECTION 5.3  Obligations  Not  Affected.  The  obligations,  covenants,
agreements and duties of the Guarantor  under this Guarantee  Agreement shall in
no way be affected or impaired by reason of the  happening  from time to time of
any of the following:

         (a) the release or waiver,  by  operation of law or  otherwise,  of the
performance  or  observance  by the Issuer of any express or implied  agreement,
covenant, term or condition relating to the Preferred Securities to be performed
or observed by the Issuer;

         (b) the  extension  of time for the payment by the Issuer of all or any
portion of the Distributions,  Redemption Price, Liquidation Distribution or any
other sums payable under the terms of the Preferred  Securities or the extension
of time for the performance of any other obligation under, arising out of, or in
connection with, the Preferred  Securities  (other than an extension of time for
payment of Distributions that results from the extension of any interest payment
period on the Debt Securities as so provided in the Indenture);

         (c) any  failure,  omission,  delay or lack of diligence on the part of
the Holders to enforce, assert or exercise any right, privilege, power or remedy
conferred on the Holders pursuant to the terms of the Preferred  Securities,  or
any action on the part of the Issuer  granting  indulgence  or  extension of any
kind;

         (d) the voluntary or involuntary liquidation,  dissolution, sale of any
collateral, receivership,  insolvency, bankruptcy, assignment for the benefit of
creditors, reorganization,  arrangement, composition or readjustment of debt of,
or other similar proceedings  affecting,  the Issuer or any of the assets of the
Issuer;

         (e) any  invalidity  of, or  defect or  deficiency  in,  the  Preferred
Securities;

         (f) the settlement or compromise of any obligation guaranteed hereby or
hereby incurred; or

                                      -11-
<PAGE>

         (g) any other circumstance whatsoever that might otherwise constitute a
legal or equitable  discharge or defense of a guarantor,  it being the intent of
this  Section  5.3 that the  obligations  of the  Guarantor  hereunder  shall be
absolute and unconditional under any and all circumstances.

         There shall be no obligation of the Holders or the Guarantee Trustee to
give  notice to, or obtain the  consent of, the  Guarantor  with  respect to the
happening of any of the foregoing.

         SECTION 5.4 Rights of Holders.  The  Guarantor  expressly  acknowledges
that: (i) this Guarantee  Agreement will be deposited with the Guarantee Trustee
to be held for the benefit of the Holders;  (ii) the  Guarantee  Trustee has the
right to enforce this  Guarantee  Agreement on behalf of the Holders;  (iii) the
Holders of a Majority in Liquidation  Amount of the Securities have the right to
direct the time,  method and place of conducting  any  proceeding for any remedy
available to the Guarantee Trustee in respect of this Guarantee  Agreement or to
direct the exercise of any trust or power  conferred upon the Guarantee  Trustee
under this Guarantee Agreement; (iv) any Holder may institute a legal proceeding
directly  against  the  Guarantor  to enforce  its rights  under this  Guarantee
Agreement,  without first  instituting a legal proceeding  against the Guarantee
Trustee,  the Issuer or any other  Person;  and (v) if an Event of Default  with
respect to the Debt  Securities  constituting  the  failure to pay  interest  or
principal  on the Debt  Securities  on the date such  interest or  principal  is
otherwise payable has occurred and is continuing, then any Holder shall have the
right,  which is absolute and  unconditional,  to proceed  directly  against the
Guarantor to obtain Guarantee Payments without first waiting to determine if the
Guarantee  Trustee has enforced this Guarantee  Agreement or instituting a legal
proceeding against the Issuer, the Guarantee Trustee or any other Person.

         SECTION 5.5 Guarantee of Payment.  This Guarantee  Agreement  creates a
guarantee of payment and not of collection. This Guarantee Agreement will not be
discharged  except  by  payment  of the  Guarantee  Payments  in  full  (without
duplication of amounts  theretofore paid by the Issuer) or upon  distribution of
Debt Securities to Holders as provided in the Trust Agreement.

         SECTION 5.6  Subrogation.  The Guarantor shall be subrogated to all (if
any) rights of the Holders  against the Issuer in respect of any amounts paid to
the Holders by the Guarantor  under this Guarantee  Agreement and shall have the
right to waive payment by the Issuer pursuant to Section 5.1; provided, however,
that the  Guarantor  shall not  (except  to the  extent  required  by  mandatory
provisions  of law) be entitled to enforce or exercise  any rights  which it may
acquire  by  way  of  subrogation  or  any  indemnity,  reimbursement  or  other
agreement,  in all cases as a result of payment under this Guarantee  Agreement,
if, at the time of any such  payment,  any amounts are due and unpaid under this
Guarantee  Agreement.  If any amount shall be paid to the Guarantor in violation
of the preceding sentence, the Guarantor agrees to hold such amount in trust for
the Holders and to pay over such amount to the Guarantor Trustee for the benefit
of the Holders.

         SECTION 5.7 Independent  Obligations.  The Guarantor  acknowledges that
its obligations  hereunder are independent of the obligations of the Issuer with
respect to the Preferred  Securities  and that the Guarantor  shall be liable as
principal and debtor hereunder to make Guarantee  Payments pursuant to the terms
of this Guarantee Agreement notwithstanding

                                      -12-
<PAGE>

the  occurrence  of any  event  referred  to in  subsections  (a)  through  (g),
inclusive, of Section 5.3 hereof.

         SECTION 5.8 Subordination.  The Guarantee  Agreement will constitute an
unsecured  obligation  of the Guarantor and will rank junior in right of payment
to the Senior  Indebtedness  of the Guarantor in the same manner and to the same
extent  as set  forth in  Article  Fourteen  of the  Indenture.  Each  Holder of
Preferred  Securities,  by its acceptance  thereof,  agrees to the subordination
provisions and other terms of this Guarantee Agreement.

         If an "Event of Default" (as defined in the Indenture) has occurred and
is continuing,  the rights of holders of Common  Securities to receive Guarantee
Payments under the Common Securities  Guarantee Agreement are subordinate to the
rights of the Holders of  Preferred  Securities  to receive  Guarantee  Payments
under this Guarantee Agreement.

                                   ARTICLE VI

                                    COVENANTS

         (a) Certain Covenants of the Guarantor. (a) The Guarantor covenants and
agrees (i) to  maintain  directly or  indirectly  100%  ownership  of the Common
Securities;  provided that any successors or assigns of the Guarantor  permitted
by  the  Indenture  may  succeed  to the  Guarantor's  ownership  of the  Common
Securities,  (ii) not to voluntarily terminate,  wind-up or liquidate the Issuer
except (A) in connection with a distribution of the Debentures to the holders of
the Preferred  Securities in liquidation of the Issuer or (B) in connection with
any merger,  consolidation  or amalgamation  permitted by the Trust Agreement of
the Issuer, and (iii) to use its reasonable  efforts,  consistent with the terms
and  provisions  of the Trust  Agreement  of the Issuer,  to cause the Issuer to
remain  classified  as a grantor  trust for  United  States  Federal  income tax
purposes.

         (b) The  Guarantor  covenants and agrees that if and so long as (i) the
Property Trustee is the Holder of all the Debentures on behalf of the Issuer and
(ii) the  Guarantor  has  elected,  and has not revoked  such  election,  to pay
Additional  Sums, the Guarantor  shall pay to the Issuer the Additional  Sums in
respect of the Preferred Securities and Common Securities.

                                  ARTICLE VII

                                   TERMINATION

         SECTION 7.1 Termination. This Guarantee Agreement shall terminate as to
each Holder with respect to the Preferred  Securities of the Issuer and be of no
further force and effect upon the earliest of (i) full payment of the redemption
price of all Preferred  Securities,  (ii) distribution of the Debt Securities of
the  Guarantor  held by the Issuer to the  Holders or (iii) full  payment of the
amounts payable in accordance  with the Trust Agreement upon  liquidation of the
Issuer. Notwithstanding the foregoing, this Guarantee Agreement will continue to
be  effective  or will be  reinstated,  as the case  may be,  if at any time any
Holder must restore payment of any

                                      -13-
<PAGE>

sums paid under such Preferred Securities or this Guarantee Agreement.

                                  ARTICLE VIII

                                  MISCELLANEOUS

         SECTION 8.1  Successors  and Assigns.  All  guarantees  and  agreements
contained  in this  Guarantee  Agreement  shall  bind the  successors,  assigns,
receivers,  trustees and representatives of the Guarantor and shall inure to the
benefit of the Holders of the Preferred  Securities then outstanding.  Except in
connection with a consolidation,  merger or sale involving the Guarantor that is
permitted  under  Article 8 of the  Indenture and pursuant to which the assignee
agrees  in  writing  to  perform  the  Guarantor's  obligations  hereunder,  the
Guarantor shall not assign its obligations hereunder.

         SECTION 8.2 Amendments. Except with respect to any changes which do not
adversely  affect the rights of the  Holders in any  material  respect (in which
case no consent of the Holders will be required),  this Guarantee  Agreement may
only be  amended  with the  prior  approval  of the  Holders  of not less than a
Majority in Liquidation Amount of the Securities. The provisions of Article 6 of
the Trust Agreement concerning meetings of the Holders shall apply to the giving
of such  approval.  The Guarantor  shall  furnish the Guarantee  Trustee with an
Officers' Certificate and an Opinion of Counsel to the effect that any amendment
of this Agreement is authorized and permitted and that all conditions precedent,
if any, in this  Guarantee  Agreement,  to the  execution  and  delivery of such
amendment have been satisfied.

         SECTION  8.3  Notices.  Any  notice,  request  or  other  communication
required or permitted to be given hereunder shall be in writing,  duly signed by
the party giving such notice, and delivered, telecopied or mailed by first class
mail as follows:

         (a) if given to the  Guarantor,  to the address set forth below or such
other address as the Guarantor may give notice of to the Holders:

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

         (b) if given to the Issuer,  in care of the Guarantee  Trustee,  at the
Issuer's  (and the  Guarantee  Trustee's)  address set forth below or such other
address as the  Guarantee  Trustee on behalf of the Issuer may give notice of to
the Holders:

                  SNH Capital Trust I
                  c/o Senior Housing Properties Trust
                  400 Centre Street
                  Newton, Massachusetts 02458
                  Attention:  Treasurer

                                      -14-
<PAGE>

with a copy to:

                  State Street Bank and Trust Company
                  2 Avenue de Lafayette
                  Boston, Massachusetts 02111
                  Attention:  Paul D. Allen, Corporate Trust Department

         (c) if given to any  Holder,  at the address set forth on the books and
records of the Issuer.

         All notices  hereunder shall be deemed to have been given when received
in person,  telecopied  with receipt  confirmed,  or mailed by first class mail,
postage  prepaid,  except that if a notice or other document is refused delivery
or cannot be  delivered  because  of a changed  address  of which no notice  was
given,  such notice or other  document shall be deemed to have been delivered on
the date of such refusal or inability to deliver.

         SECTION 8.4 Benefit. This Guarantee Agreement is solely for the benefit
of the Holders and is not separately transferable from the Preferred Securities.

         SECTION 8.5  Interpretation.  In this Guarantee  Agreement,  unless the
context otherwise requires:

         (a) capitalized terms used in this Guarantee  Agreement but not defined
in the preamble hereto have the
respective meanings assigned to them in Section 1.1;

         (b) a term defined  anywhere in this  Guarantee  Agreement has the same
meaning throughout;

         (c) all  references to "the  Guarantee  Agreement"  or "this  Guarantee
Agreement" are to this Guarantee Agreement as modified,  supplemented or amended
from time to time;

         (d) all references in this Guarantee Agreement to Articles and Sections
are to  Articles  and  Sections of this  Guarantee  Agreement  unless  otherwise
specified;

         (e) a term defined in the Trust Indenture Act has the same meaning when
used in this  Guarantee  Agreement  unless  otherwise  defined in this Guarantee
Agreement or unless the context otherwise requires;

         (f) a reference to the singular includes the plural and vice versa; and

         (g) the masculine, feminine or neuter genders used herein shall include
the masculine, feminine and neuter genders.

         SECTION 8.6 Governing Law. THIS GUARANTEE  AGREEMENT  SHALL BE GOVERNED
BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW
YORK WITHOUT REGARD TO THE CONFLICTS OF LAW PRINCIPLES THEREOF.

                                      -15-
<PAGE>

         This instrument may be executed in any number of counterparts,  each of
which so executed shall be deemed to be an original,  but all such  counterparts
shall together constitute but one and the same instrument.

         THIS GUARANTEE AGREEMENT is executed as of the day and year first above
written.

                               SENIOR HOUSING PROPERTIES TRUST

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

                               STATE STREET BANK AND TRUST COMPANY

                               -----------------------------------,
                               as Guarantee Trustee

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

                                      -16-

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