Exhibit 1.1


                         SENIOR HOUSING PROPERTIES TRUST

                     $200,000,000 Aggregate Principal Amount

                          8 5/8% Senior Notes Due 2012

                             UNDERWRITING AGREEMENT


December 13, 2001



                             UNDERWRITING AGREEMENT
                                                          December 13, 2001

UBS Warburg LLC
Dresdner Kleinwort Wasserstein
        -- Grantchester, Inc.
First Union Securities, Inc.
BMO Nesbitt Burns Corp.
CIBC World Markets Corp.
PNC Capital Markets, Inc.
SG Cowen Securities Corporation

c/o UBS Warburg LLC
299 Park Avenue
New York, New York  10171-0026

Ladies and Gentlemen:

         Senior Housing Properties Trust, a real estate investment trust
organized under the laws of the State of Maryland (the "COMPANY"), proposes to
issue and sell to the underwriters named in SCHEDULE A annexed hereto (the
"UNDERWRITERS") $200,000,000 in aggregate principal amount of its 8 5/8% Senior
Notes Due 2012 (the "NOTES"). The Notes are to be issued pursuant to an
indenture to be dated as of December 20, 2001, between the Company and State
Street Bank and Trust Company, as trustee (the "TRUSTEE"), as supplemented by a
first supplemental indenture thereto to be dated as of December 20, 2001 (the
"Indenture"). Copies of the Indenture, in substantially final form, have been
delivered to each of the Underwriters.

         The Company has prepared and filed with the Securities and Exchange
Commission (the "COMMISSION") in accordance with the provisions of the
Securities Act of 1933, as amended, and the rules and regulations of the
Commission thereunder (collectively, the "ACT"), a registration statement (file
number 333-60392) on Form S-3 under the Act (the "REGISTRATION STATEMENT"),
including a prospectus relating to, among other things, common shares of
beneficial interest, preferred shares of beneficial interest, depository shares,
guarantees, debt securities and warrants for such securities of the Company, and
such amendments to such registration statement as may have been required prior
to the date hereof have been similarly prepared and have been filed with the
Commission. Such registration statement, as so amended, and any post-effective
amendments thereto, have been declared by the Commission to be effective under
the Act. Such registration statement, as amended at the date of this Agreement,
meets the requirements set forth in Rule 415(a)(1)(x) under the Act and complies
in all other material respects with said Rule. The Company will next file with
the Commission pursuant to Rule 424(b) under the Act a final prospectus
supplement to the basic prospectus included in such

                                       2


registration statement, as so amended, describing the Notes and the offering
thereof, in such form as has been provided to or discussed with, and approved,
by the Underwriters.

         The term "REGISTRATION STATEMENT" as used in this Agreement means the
registration statement, as amended at the time it became effective, as
supplemented or amended prior to the execution of this Agreement, including (i)
all financial schedules and exhibits thereto and (ii) all documents incorporated
by reference or deemed to be incorporated by reference therein. If it is
contemplated, at the time this Agreement is executed, that a post-effective
amendment to the registration statement will be filed and must be declared
effective before the offering of the Notes may commence, the term "Registration
Statement" as used in this Agreement means the registration statement as amended
by said post-effective amendment. If an abbreviated registration statement is
prepared and filed with the Commission in accordance with Rule 462(b) under the
Act (an "ABBREVIATED REGISTRATION STATEMENT"), the term "Registration Statement"
includes the Abbreviated Registration Statement. The term "BASIC PROSPECTUS" as
used in this Agreement means the base prospectus dated May 21, 2001, as filed
with the Commission pursuant to Rule 424(b) included in the Registration
Statement. The term "PREPRICING PROSPECTUS" as used in this Agreement means the
preliminary form of the Prospectus Supplement (as defined herein) subject to
completion, dated December 6, 2001, used in connection with the offering of the
Notes. The term "PROSPECTUS SUPPLEMENT" as used in this Agreement means any
final prospectus supplement specifically relating to the Notes, in the form
filed with, or transmitted for filing to, the Commission pursuant to Rule 424
under the Act. The term "PROSPECTUS" as used in this Agreement means the Basic
Prospectus together with the Prospectus Supplement, except that if such Basic
Prospectus is amended or supplemented on or prior to the date on which the
Prospectus Supplement was first filed pursuant to Rule 424, the term
"PROSPECTUS" shall refer to the Basic Prospectus as so amended or supplemented
and as supplemented by the Prospectus Supplement. Any reference in this
Agreement to the registration statement, the Registration Statement, the Basic
Prospectus, any Prepricing Prospectus, any Prospectus Supplement or the
Prospectus shall be deemed to refer to and include the documents incorporated by
reference therein pursuant to Item 12 of Form S-3 under the Act, as of the date
of the registration statement, the Registration Statement, the Basic Prospectus,
such Prepricing Prospectus, such Prospectus Supplement or the Prospectus, as the
case may be, and any reference to any amendment or supplement to the
registration statement, the Registration Statement, the Basic Prospectus, any
Prepricing Prospectus, any Prospectus Supplement or the Prospectus shall be
deemed to refer to and include any documents filed after such date under the
Securities Exchange Act of 1934, as amended (the "EXCHANGE ACT"), which, upon
filing, are incorporated by reference therein, as required by paragraph (b) of
Item 12 of Form S-3. As used herein, the term "INCORPORATED DOCUMENTS" means the
documents which are incorporated by reference in the registration statement, the
Registration Statement, the Basic Prospectus, any Prepricing Prospectus, any
Prospectus Supplement, the Prospectus, or any amendment or supplement thereto.

         The Company and the Underwriters agree as follows:

         1. SALE AND PURCHASE. On the basis of the representations and
warranties herein and subject to the terms and conditions herein set forth, the
Company agrees to issue and sell to each Underwriter and, upon the basis of the
representations, warranties and agreements of the Company herein contained and
subject to all the terms and conditions set forth herein, each

                                       3


Underwriter agrees, severally and not jointly, to purchase from the Company, at
a purchase price of 97.163% of the principal amount thereof (the "PURCHASE
PRICE"), the principal amount of Notes set forth opposite the name of such
Underwriter in SCHEDULE A annexed hereto (or such principal amount of Notes
increased as set forth in Section 8 hereof).

         The Company is advised by you that the Underwriters intend (i) to make
a public offering of the Notes as soon after the date hereof as in your judgment
is advisable and (ii) initially to offer the Notes upon the terms set forth in
the Prospectus.

         2. PAYMENT AND DELIVERY. Payment of the purchase price for the Notes
shall be made to the Company by Federal Funds wire transfer, against delivery of
the Notes to you through the facilities of the Depository Trust Company ("DTC")
for the respective accounts of the Underwriters. Such payment and delivery shall
be made at 10:00 A.M., New York City time, on December 20, 2001 (unless another
time shall be agreed to by you or unless postponed in accordance with the
provisions of Section 8 hereof). The time at which such payment and delivery are
actually made is hereinafter sometimes called the "TIME OF PURCHASE."

         3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company
represents and warrants to each of the Underwriters that:

         (a) No order preventing or suspending the use of the Basic Prospectus,
    any Prepricing Prospectus, the Prospectus Supplement or the Prospectus is in
    effect and no proceedings for such purpose are pending or, to the knowledge
    of the Company, threatened by the Commission or the securities authority of
    any state or other jurisdiction. The Registration Statement has become
    effective under the Act; no stop order suspending the effectiveness of the
    Registration Statement is in effect, and no proceedings for such purpose are
    pending before or, to the knowledge of the Company, threatened by the
    Commission or the securities authority of any state or other jurisdiction.

         (b) (i) The Company is eligible to use Form S-3 and the offering of
    the Notes complies with the requirements of Rule 415, (ii) each part of
    the Registration Statement, when such part became effective, and also any
    Abbreviated Registration Statement when it shall become effective,
    complied in all material respects with applicable requirements of the
    Act, the Exchange Act and the Trust Indenture Act of 1939 (the "1939
    ACT"), (iii) each part of the Registration Statement, when such part
    became effective, did not contain and each such part, as may be amended
    or supplemented, if applicable, will not contain any untrue statement of
    a material fact or omit to state a material fact required to be stated
    therein or necessary to make the statements therein not misleading, (iv)
    the Registration Statement, any Abbreviated Registration Statement, the
    Basic Prospectus, any Prepricing Prospectus, the Prospectus Supplement
    and the Prospectus comply and, as may be amended or supplemented, if
    applicable, will comply in all material respects with the Act, the
    Exchange Act and the 1939 Act and (v) the Prospectus does not contain
    and, as may be amended or supplemented, if applicable, will not contain
    any untrue statement of a material fact or omit to state a material fact
    necessary to make the statements therein, in the light of the
    circumstances under which they were made, not misleading, except that the
    representations and warranties set forth in this paragraph (b) do not
    apply to (x) statements or omissions in the Registration Statement, the
    Basic Prospectus, any

                                       4


    Prepricing Prospectus, the Prospectus Supplement or the Prospectus based
    upon information relating to any Underwriter furnished to the Company by
    such Underwriter through you expressly for use therein or (y) the
    Trustee's Statement of Eligibility and Qualification on Form T-1 (the
    "FORM T-1") under the 1939 Act.

         (c) The Incorporated Documents, when they were filed with the
    Commission, conformed in all material respects to the requirements of the
    Exchange Act, and none of such documents, when they were filed with the
    Commission, contained an untrue statement of a material fact or omitted to
    state a material fact necessary to make the statements therein not
    misleading; and any further documents so filed and incorporated by reference
    in the Registration Statement and/or the Prospectus, when such documents are
    filed with the Commission, will conform in all material respects to the
    requirements of the Exchange Act, as applicable, and will not contain an
    untrue statement of a material fact or omit to state a material fact
    necessary to make the statements therein, in the light of the circumstances
    in which they were made, not misleading.

         (d) The Indenture has been duly and validly authorized by the Company
    and, upon its execution and delivery by the Company and assuming due
    execution and delivery by the Trustee, will be a valid and binding agreement
    of the Company, enforceable in accordance with its terms, except as
    enforcement thereof may be limited by bankruptcy, insolvency or other
    similar laws affecting creditors' rights generally or general equitable
    principles; and the Indenture has been duly qualified under the 1939 Act and
    conforms in all material respects to the description thereof in the
    Registration Statement and the Prospectus.

         (e) The Notes have been duly and validly authorized by the Company and,
    when executed by the Company and authenticated by the Trustee in accordance
    with the Indenture and delivered to the Underwriters against payment
    therefor in accordance with the terms hereof, will have been validly issued
    and delivered, and will constitute valid and binding obligations of the
    Company entitled to the benefits of the Indenture and enforceable in
    accordance with their terms, except as enforcement thereof may be limited by
    bankruptcy, insolvency or other similar laws affecting the enforcement of
    creditors' rights generally or by general equitable principles, and the
    Notes will conform in all material respects to the description thereof in
    the Prospectus.

         (f) As of the date of this Agreement, the Company has and will have an
    authorized capitalization as set forth in the Prospectus; all of the issued
    and outstanding Common Shares of the Company have been duly and validly
    authorized and issued and are fully paid and non-assessable, have been
    issued in compliance with all federal and state securities laws and were not
    issued in violation of any preemptive or similar right.

         (g) The Company has been duly formed and is existing as a real estate
    investment trust in good standing under the laws of the State of Maryland,
    with trust power to own, lease and operate its properties and conduct its
    business as described in the Registration Statement.

                                       5


         (h) The Company is duly qualified and is in good standing in each
    jurisdiction in which the ownership or leasing of its properties or the
    conduct of its business requires such qualification, except where the
    failure to so qualify in any such jurisdiction would not individually or in
    the aggregate have a material adverse effect on the business, prospects,
    properties, condition (financial or otherwise) or results of operations of
    the Company and the Subsidiaries (as defined herein), taken as a whole (a
    "MATERIAL ADVERSE EFFECT").

         (i) The Company has no subsidiaries (as defined in the Act) other than
    those identified in SCHEDULE B hereto (collectively, the "SUBSIDIARIES").
    Other than the Subsidiaries, the Company does not own, directly or
    indirectly, any shares of stock or any other equity or long-term debt of any
    other corporation or have any direct or indirect equity interest or
    ownership of long-term debt in any firm, partnership, joint venture, limited
    liability company, association or other entity except for the Company's
    ownership of 1,000,000 common shares of HRPT Properties Trust and 100 common
    shares of Marriott International, Inc. The Subsidiaries identified in
    SCHEDULE C hereto have no material assets, liabilities, operations or
    properties. Each Subsidiary has been duly incorporated or formed and is
    validly existing as a corporation or other entity, as the case may be, in
    good standing under the laws of the jurisdiction of its incorporation or
    organization, with the requisite corporate, trust, partnership or other
    power to acquire and own, lease and operate its properties and to conduct
    its business, as described in the Registration Statement and the Prospectus;
    and each Subsidiary is duly qualified and in good standing to do business in
    each jurisdiction in which the nature of its business or the ownership or
    leasing of the property requires such qualification, except where the
    failure to be so qualified would not have a Material Adverse Effect.

         (j) This Agreement has been duly authorized, executed and delivered by
    the Company.

         (k) Neither the Company nor any of the Subsidiaries is in breach or
    violation of, or in default under (and no event has occurred which with
    notice, lapse of time, or both would result in any breach or violation of,
    or constitute a default under), its Declaration of Trust, charter or by-laws
    or other organizational documents or in the performance or observance of any
    obligation, agreement, covenant or condition contained in any indenture,
    mortgage, deed of trust, loan agreement or other agreement or instrument to
    which the Company or any Subsidiary is subject or by which any of them or
    any of their properties is bound or affected, the effect of which would,
    individually or in the aggregate, have a Material Adverse Effect or decree,
    order or judgment applicable to the Company or any Subsidiary.

         (l) Except as would not individually or in the aggregate have a
    Material Adverse Effect, the issuance by the Company of the Notes, the
    compliance by the Company with all of the provisions of this Agreement, the
    execution, delivery and performance by the Company of this Agreement, and
    the consummation of the transactions contemplated herein will not conflict
    with or result in a breach or violation of any of the terms or provisions
    of, or constitute a default under, any indenture, mortgage, deed of trust,
    loan agreement or other agreement or instrument to which the Company or


                                       6



    any Subsidiary is a party or by which the Company or any Subsidiary is
    bound or to which any of the property or assets of the Company or any
    Subsidiary is subject. In addition, such action will not result in any
    violation of the provisions of the Declaration of Trust or the bylaws of
    the Company or

    any Subsidiary or any of the Company's or any Subsidiary's other
    organizational documents or applicable laws or any order, rule or regulation
    of any court or governmental agency or body having jurisdiction over the
    Company or any of its or its Subsidiaries' properties.

         (m) No approval, authorization, consent or order of or filing with any
    federal, state or local or foreign governmental or regulatory commission,
    board, body, authority or agency is required in connection with the issuance
    and sale of the Notes or the consummation by the Company of the transaction
    as contemplated hereby other than registration of the Notes under the Act,
    the qualification of the Indenture under the 1939 Act and any necessary
    qualification under the securities or blue sky laws of the various
    jurisdictions in which the Notes are being offered by the Underwriters.

         (n) Except as set forth in the Registration Statement and the
    Prospectus: (i) no person has the right, contractual or otherwise, to cause
    the Company to issue to it, or register pursuant to the Act, the Notes. No
    person has the right, contractual or otherwise, to cause the Company to
    register under the Act any securities of the Company as a result of the
    filing or effectiveness of the Registration Statement or the sale of Notes
    contemplated thereby, except for such rights as have been complied with or
    waived.

         (o) Ernst & Young LLP, whose report on the consolidated financial
    statements of the Company and the Subsidiaries was filed with the Commission
    as part of the Company's Annual Report on Form 10-K for the fiscal year
    ended December 31, 2000 and is incorporated by reference in the Registration
    Statement and Prospectus, are independent public accountants as required by
    the Act.

         (p) KPMG LLP, whose report on the financial statements with respect to
    42 nursing home facilities was filed with the Commission as part of the
    Company's Current Report on Form 8-K/A and is incorporated by reference in
    the Registration Statement and Prospectus, are independent public
    accountants as required by the Act.

         (q) Arthur Andersen LLP, whose report on the financial statements with
    respect to 31 facilities ("CRESTLINE FACILITIES") to be acquired by the
    Company pursuant to a Stock Purchase Agreement, dated August 9, 2001, among
    the Company, SNH/CSL Properties Trust, Crestline Capital Corporation and CSL
    Group, Inc. was filed with the Commission as part of the Company's Current
    Report on Form 8-K, dated September 21, 2001 (the "SEPTEMBER 21, 2001 8-K"),
    and is incorporated by reference in the Registration Statement and
    Prospectus, are independent public accountants as required by the Act.

         (r) All legal or governmental proceedings, contracts, leases or
    documents of a character required to be described in the Registration
    Statement or the Prospectus or any Incorporated Document, and all documents
    required to be filed as an exhibit to the

                                       7


    Registration Statement or any Incorporated Document, have been so described
    or filed or will be filed prior to the time of purchase as required.

         (s) Except as otherwise set forth in the Prospectus, there are no legal
    or governmental proceedings pending to which the Company or any of the
    Subsidiaries is a party or of which any of the Company's or any of the
    Subsidiaries' properties or assets is the subject, the result of which
    would, individually or in the aggregate, have a Material Adverse Effect,
    and, to the Company's knowledge, no such proceedings are threatened or
    contemplated, except as disclosed in the Prospectus, the result of which
    would, individually or in the aggregate, have a Material Adverse Effect. To
    the Company's knowledge, there are no legal or governmental proceedings
    pending to which any lessee, sublessee or operator of any property of the
    Company or any Subsidiary or portion thereof is a party, the result of which
    would, individually or in the aggregate, have a Material Adverse Effect, and
    no such proceedings are being threatened or contemplated, except as
    disclosed in the Prospectus and the result of which would, individually or
    in the aggregate, have a Material Adverse Effect. Neither the Company nor
    any of the Subsidiaries has received from any governmental authority notice
    of any violation of any local, state or federal law, rule or regulation
    including without limitation any such law, rule or regulation applicable to
    the health care industry ("HEALTH CARE LAWS") or relating to human health or
    safety or the environment or any hazardous or toxic substances or wastes,
    pollutants or contaminants ("ENVIRONMENTAL LAWS"), except as disclosed in
    the Prospectus, the result of which would, individually or in the aggregate,
    have a Material Adverse Effect, and to the Company's knowledge, there is no
    such violation, or any occurrence or circumstance that would give rise to a
    claim under or pursuant to any local, state or federal law, rule or
    regulation (including without limitation any Health Care Laws or
    Environmental Laws), which would, individually or in the aggregate, have a
    Material Adverse Effect. To the Company's knowledge, there is no violation
    of any local, state or federal law, rule or regulation (including without
    limitation Health Care Laws and Environmental Laws) by any person from whom
    the Company or any of the Subsidiaries acquired any of its properties (a
    "SELLER"), or any lessee, sublessee or operator of any of their respective
    properties or any part thereof, the result of which would, individually or
    in the aggregate, have a Material Adverse Effect, and to the Company's
    knowledge, there is no such violation, or any occurrence or circumstance
    that would give rise to a claim under or pursuant to any local, state or
    federal law, rule or regulation (including without limitation any Health
    Care Laws or Environmental Laws), which would, individually or in the
    aggregate, have a Material Adverse Effect, except as disclosed in the
    Prospectus. Neither the Company nor any of the Subsidiaries has received
    from any governmental authority any written notice of any condemnation of or
    zoning change affecting the properties or any part thereof of the Company or
    any of the Subsidiaries that individually or in the aggregate would have a
    Material Adverse Effect and the Company does not know of any such
    condemnation or zoning change which is threatened and which if consummated
    individually or in the aggregate would have a Material Adverse Effect.
    Nothing has come to the Company's attention that any seller, lessee,
    sublessee or operator of any property of the Company or any of the
    Subsidiaries, or portion thereof has, received from any governmental
    authority any written notice of any condemnation of or zoning change
    affecting the Properties or any part thereof of the

                                       8


    Company or any of the Subsidiaries that individually or in the aggregate
    would have a Material Adverse Effect.

         (t) Each of the Company and the Subsidiaries have good and marketable
    title in fee simple or ground leases to the properties disclosed in the
    Prospectus as being owned by them (the "PROPERTIES"), free and clear of all
    liens, encumbrances, claims, mortgages, deeds of trust, restrictions,
    security interests and defects ("PROPERTY ENCUMBRANCES"), except for: (x)
    the leasehold interests of lessees in the Company's and the Subsidiaries'
    properties held under lease (the "LEASES") and (y) any other Property
    Encumbrances that would not, individually or in the aggregate, have a
    Material Adverse Effect. All Property Encumbrances on or affecting the
    properties of the Company or any of the Subsidiaries which are required to
    be disclosed in the Prospectus are disclosed therein. Each of the Leases
    pertaining to the properties of the Company or any of the Subsidiaries has
    been duly authorized by the Company or one of the Subsidiaries, as
    applicable, and is a valid and binding agreement of the Company or one of
    the Subsidiaries, as applicable, and, to the Company's knowledge, each other
    party thereto, enforceable in accordance with its terms, except as
    enforcement thereof may be limited by bankruptcy, insolvency, moratorium,
    fraudulent conveyance or other similar laws affecting the enforcement of
    creditors' rights generally and by general equitable principles. To the
    Company's knowledge, no lessee of any portion of any of the properties of
    the Company or any of the Subsidiaries is in default under its respective
    lease and there is no event which, but for the passage of time or the giving
    of notice or both, would constitute a default under any such lease, except
    such defaults that would not, individually or in the aggregate, have a
    Material Adverse Effect.

         (u) The Company and each of the Subsidiaries and, to the Company's
    knowledge, each of the operators, lessees or sublessees of any property or
    portion thereof of the Company or any of the Subsidiaries have such permits,
    licenses, approvals, certificates, franchises and authorizations of
    governmental or regulatory authorities ("PERMITS"), including, without
    limitation, under any Health Care Laws or Environmental Laws, as are
    necessary in the case of each such party to acquire and own, lease or
    operate its properties and to conduct its business, all as described in the
    Prospectus, except where the failure to obtain such permits would not
    individually or in the aggregate have a Material Adverse Effect; except as
    described in the Prospectus, the Company and each of the Subsidiaries and,
    to the Company's knowledge, each of the lessees, sublessees or operators of
    any property or portion thereof of the Company or any of the Subsidiaries
    have fulfilled and performed all of their obligations with respect to such
    permits and, except as disclosed in the Prospectus, no event has occurred
    which allows, or after notice or lapse of time would allow, revocation or
    termination thereof or result in any other impairment of the rights of the
    holder of any such permit, except where the failure to fulfill or perform,
    or the resulting termination or impairment, would not, individually or in
    the aggregate, have a Material Adverse Effect; and, except as described in
    the Prospectus, such permits contain no restrictions that are burdensome to
    the Company and the Subsidiaries, taken as a whole and that would,
    individually or in the aggregate, have a Material Adverse Effect.

                                       9


         (v) The financial statements, together with the related schedules and
    notes, forming a part of the Registration Statement and the Prospectus
    present fairly the consolidated financial position of the Company and the
    Subsidiaries as of the dates indicated and the consolidated results of
    operations and cash flows of the Company and the Subsidiaries for the
    periods specified. Such financial statements have been prepared in
    conformity with generally accepted accounting principles applied on a
    consistent basis during the periods involved. The pro forma financial
    statements and other pro forma financial data included or incorporated by
    reference in the Registration Statement and the Prospectus comply as to form
    in all material respects with the applicable accounting requirements of
    Regulation S-X of the Act, and the pro forma adjustments have been properly
    applied to the historical amounts in the compilation of those statements.
    The other financial and statistical data set forth in the Registration
    Statement and the Prospectus are accurately presented and prepared on a
    basis consistent with such financial statements and books and records of the
    Company. There are no financial statements (historical or pro forma) that
    are required to be included in the Registration Statement and the Prospectus
    that are not included as required.

         (w) Subsequent to the respective dates as of which information is given
    in the Registration Statement and the Prospectus, there has not been (i) any
    material adverse change, or any prospective material adverse change, in the
    business, properties, condition (financial or otherwise) or results of
    operations of the Company and the Subsidiaries taken as a whole, (ii) any
    transaction which is material to the Company or the Subsidiaries, (iii) any
    obligation, direct or contingent, which is material to the Company and the
    Subsidiaries taken as a whole, incurred by the Company or the Subsidiaries,
    (iv) any material change in the outstanding shares of beneficial interest or
    material increase in the outstanding indebtedness of the Company or the
    Subsidiaries, (v) any dividend or distribution of any kind declared, paid or
    made on the shares of beneficial interest of the Company other than (A)
    regular quarterly dividends, declared, paid or made or a dividend
    distribution of any kind on any class of its shares of beneficial interest
    (other than dividends or distributions from wholly-owned subsidiaries of the
    Company) and (B) the issuance of common shares of beneficial interest to the
    trustees and officers pursuant to the Company's Incentive Share Award Plan,
    or (vi) to the Company's knowledge, any material adverse change, or any
    prospective material adverse change, in the business, properties, condition
    (financial or otherwise) or results of operations of the business of the
    Crestline Facilities, as described in the Company's September 21, 2001
    Current Report on Form 8-K, taken as a whole. None of the Company nor the
    Subsidiaries has any material contingent obligation which is not disclosed
    in the Registration Statement.

         (x) Each of the Company and the Subsidiaries are insured by insurers of
    recognized financial responsibility against such losses and risks and in
    such amount as are customary in the business in which they are engaged,
    except as described in the Prospectus. Except as would not, individually or
    in the aggregate, have a Material Adverse Effect, all policies of insurance
    insuring the Company and the Subsidiaries or any of their businesses,
    assets, employees, officers, directors and trustees are in full force and
    effect, and the Company and the Subsidiaries are in compliance with the
    terms of such policies in all material respects. Except as would not,
    individually or in the aggregate, have a Material Adverse Effect, there are
    no claims by the Company or any of

                                       10


    the Subsidiaries under any such policy or instrument as to which any
    insurance company is denying liability or defending under a reservation of
    rights clause.

         (y) Except as disclosed in the Registration Statement, neither the
    Company nor any of the Subsidiaries has either sent or received any
    communication regarding termination of, or intent not to renew, any of the
    contracts or agreements referred to or described in, or filed as an exhibit
    to, the Registration Statement or any Incorporated Document, and no such
    termination or non-renewal has been threatened by the Company or any of the
    Subsidiaries or any other party to any such contract or agreement.

         (z) Neither the Company nor any of the Subsidiaries or any of their
    respective affiliates has taken, directly or indirectly, any action designed
    to or which has constituted or which might reasonably be expected to cause
    or result, under the Exchange Act or otherwise, in stabilization or
    manipulation of the price of any security of the Company to facilitate the
    sale or resale of the Notes.

         (aa) The Company and the Subsidiaries have not sustained since the date
    of the latest audited financial statements included in the Prospectus any
    loss or interference with their businesses from fire, explosion, flood or
    other calamity, whether or not covered by insurance, or from any labor
    dispute or court or governmental action, order or decree, otherwise than as
    disclosed in the Prospectus or other than any loss or interference, which
    would individually or in the aggregate not have a Material Adverse Effect.

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

         (cc) The Company and the Subsidiaries have filed all federal, state,
    local and foreign tax returns and tax forms required to be filed. Such
    returns and forms are complete and correct in all material respects, and all
    taxes shown by such returns or otherwise assessed that are due or payable
    have been paid, except such taxes as are being contested in good faith and
    as to which adequate reserves have been provided. All payroll withholdings
    required to be made by the Company and the Subsidiaries with respect to
    employees have been made except where the failure to fulfill or perform,
    would not, individually or in the aggregate, have a Material Adverse Effect.
    The charges, accruals and reserves on the books of the Company and the
    Subsidiaries in respect of any tax liability for any year not finally
    determined are adequate to meet any assessments or reassessments for
    additional taxes. There have been no tax deficiencies asserted and, to the
    Company's knowledge, no tax deficiency might be reasonably asserted or
    threatened against the Company and/or the Subsidiaries that would
    individually or in the aggregate have a Material Adverse Effect.

                                       11


         (dd) The Company meets the requirements for qualification and taxation
    as a real estate investment trust ("REIT") under the Internal Revenue Code
    of 1986, as amended (the "CODE").

         (ee) The Company is not and, after giving effect to the offering and
    sale of the Notes, will not be an "investment company" or an entity
    "controlled" by an "investment company," as such terms are defined in the
    Investment Company Act of 1940, as amended (the "INVESTMENT COMPANY ACT").

         4. CERTAIN COVENANTS. The Company hereby agrees:

         (a) to furnish such information as may be required and otherwise to
    cooperate in qualifying the Notes for offering and sale under the securities
    or blue sky laws of such states as you may designate and to maintain such
    qualifications in effect so long as required for the distribution of the
    Notes; PROVIDED that the Company shall not be required to qualify as a
    foreign corporation or to consent to the service of process under the laws
    of any such state (except service of process with respect to the offering
    and sale of the Notes); and to promptly advise you of the receipt by the
    Company of any notification with respect to the suspension of the
    qualification of the Notes for sale in any jurisdiction or the initiation or
    threatening of any proceeding for such purpose;

         (b) to make available to the Underwriters in New York City as many
    copies of the Prospectus (or of the Prospectus as amended or supplemented if
    the Company shall have made any amendments or supplements thereto) as the
    Underwriters may reasonably request for the purposes contemplated by the
    Act; in case any Underwriter is required to deliver a prospectus beyond the
    nine-month period referred to in Section 10(a)(3) of the Act in connection
    with the sale of the Notes, the Company will prepare promptly upon request,
    but at its expense, such amendment or amendments to the Registration
    Statement and such prospectuses as may be necessary to permit compliance
    with the requirements of Section 10(a)(3) of the Act;

         (c) to advise you promptly, confirming such advice in writing, of any
    request by the Commission for amendments or supplements to the Registration
    Statement or Prospectus or for additional information with respect thereto,
    or of notice of institution of proceedings for, or the entry of a stop order
    suspending the effectiveness of the Registration Statement and, if the
    Commission should enter a stop order suspending the effectiveness of the
    Registration Statement, to make every reasonable effort to obtain the
    lifting or removal of such order as soon as possible; to advise you promptly
    of any proposal to amend or supplement the Registration Statement or
    Prospectus, including by filing any documents that would be incorporated
    therein by reference and to file no such amendment or supplement to which
    you shall object in writing;

         (d) to file promptly all reports and any definitive proxy or
    information statement required to be filed by the Company with the
    Commission in order to comply with the Exchange Act subsequent to the date
    of the Prospectus and for so long as the delivery of a prospectus is
    required in connection with the offering or sale of the Notes, and to
    promptly notify you of such filing;

                                       12


         (e) if, at the time this Agreement is executed and delivered, it is
    necessary for the registration statement or a post-effective amendment
    thereto or any Abbreviated Registration Statement to be declared effective
    before the offering of the Notes may commence, the Company will endeavor to
    cause the registration statement or such post-effective amendment to become
    effective as soon as possible and will advise you promptly and, if requested
    by you, will confirm such advice in writing, when the registration statement
    or such post-effective amendment has become effective;

         (f) to furnish to you and, upon request, to each of the other
    Underwriters for a period of three years from the date of this Agreement (i)
    copies of any reports or other communications which the Company shall send
    to its shareholders or shall from time to time publish or publicly
    disseminate, (ii) copies of all annual, quarterly and current reports filed
    with the Commission on Forms 10-K, 10-Q and 8-K, or such other similar form
    as may be designated by the Commission, (iii) copies of documents or reports
    filed with any national securities exchange on which any class of securities
    of the Company is listed, and (iv) such other information as you may
    reasonably request regarding the Company or the Subsidiaries, in each case
    as soon as such communications, documents or information becomes available;
    PROVIDED, HOWEVER, that in no case shall the Company be required to furnish
    materials pursuant to this paragraph which are filed and publicly accessible
    via EDGAR;

         (g) to advise the Underwriters promptly of the happening of any event
    known to the Company within the time during which a Prospectus relating to
    the Notes is required to be delivered under the Act which, in the judgment
    of the Company, would require the making of any change in the Prospectus
    then being used, or in the information incorporated therein by reference, so
    that the Prospectus would not include an untrue statement of material fact
    or omit to state a material fact necessary to make the statements therein,
    in the light of the circumstances under which they are made, not misleading,
    and, during such time, to prepare and furnish, at the Company's expense, to
    the Underwriters promptly such amendments or supplements to such Prospectus
    as may be necessary to reflect any such change and to furnish you a copy of
    such proposed amendment or supplement before filing any such amendment or
    supplement with the Commission;

         (h) to make generally available to its security holders, and to deliver
    to you, an earnings statement of the Company (which will satisfy the
    provisions of Section 11(a) of the Act) covering a period of twelve months
    beginning after the effective date of the Registration Statement (as defined
    in Rule 158(c) of the Act) as soon as is reasonably practicable after the
    termination of such twelve-month period;

         (i) to furnish to its shareholders as soon as practicable after the end
    of each fiscal year an annual report (including a balance sheet and
    statements of income, shareholders' equity and of cash flow of the Company)
    for such fiscal year, accompanied by a copy of the certificate or report
    thereon of nationally recognized independent certified public accountants;

                                       13


         (j) to furnish to you one conformed copy of the Registration Statement,
    as initially filed with the Commission, and of all amendments thereto
    (including all exhibits thereto and documents incorporated by reference
    therein) and sufficient conformed copies of the foregoing (other than
    exhibits) for distribution of a copy to each of the other Underwriters;

         (k) to furnish to you as early as practicable prior to the time of
    purchase but not later than two business days prior thereto, a copy of the
    latest available unaudited interim consolidated financial statements, if
    any, of the Company and the Subsidiaries which have been read by the
    Company's independent certified public accountants, as stated in their
    letter to be furnished pursuant to Section 6(d) hereof;

         (l) to apply the net proceeds from the sale of the Notes in the manner
    set forth under the caption "Use of proceeds" in the Prospectus;

         (m) to pay all expenses, fees and taxes in connection with (i) the
    preparation and filing of the Registration Statement, each Preliminary
    Prospectus, the Prospectus, and any amendments or supplements thereto, and
    the printing and furnishing of copies of each thereof to the Underwriters
    and to dealers (including costs of mailing and shipment), (ii) the issuance,
    sale and delivery of the Notes by the Company, (iii) the word processing
    and/or printing of this Agreement, any Agreement Among Underwriters, any
    dealer agreements and the Indenture and the reproduction and/or printing and
    furnishing of copies of each thereof to the Underwriters and to dealers
    (including costs of mailing and shipment), (iv) the qualification of the
    Notes for offering and sale under state laws and the determination of their
    eligibility for investment under state law as aforesaid (including the legal
    fees and filing fees and other disbursements of counsel to the Underwriters)
    and the printing and furnishing of copies of any blue sky surveys or legal
    investment surveys to the Underwriters and to dealers and (v) the filing for
    review of the public offering of the Notes by the NASDR (including the legal
    fees and filing fees and other disbursements of counsel to the Underwriters
    with respect thereto), (vi) any listing of the Notes on any securities
    exchange and any registration thereof under the Exchange Act, (vii) the fees
    and expenses of the Trustee and its counsel, (viii) the approval of the
    Notes by DTC for "book entry" transfer, (ix) the rating of the Notes by
    rating agencies and (x) the performance of the Company's other obligations
    under this Agreement;

         (n) to furnish to you, before filing with the Commission subsequent to
    the effective date of the Registration Statement and during the period
    referred to in paragraph (a)(vii) above, a copy of any document proposed to
    be filed pursuant to Section 13, 14 or 15(d) of the Exchange Act; and

         (o) to not, without the prior written consent of UBS Warburg LLC,
    offer, sell, contract to sell, pledge, or otherwise dispose of, (or enter
    into any transaction which is designed to, or might reasonably be expected
    to, result in the disposition (whether by actual disposition or effective
    economic disposition due to cash settlement or otherwise) by the Company or
    any affiliate of the Company or any person in privity with the Company or
    any affiliate of the Company) directly or indirectly, including the filing
    (or participation in the filing) of a registration statement with the
    Commission in respect of,

                                       14


    or establish or increase a put equivalent position or liquidate or decrease
    a call equivalent position within the meaning of Section 16 of the Exchange
    Act, any debt securities issued or guaranteed by the Company (other than the
    Notes) or publicly announce an intention to effect any such transaction,
    during the period from the date hereof through and including December 31,
    2001; and

         (p) to use its best efforts to continue to qualify as a REIT under
    Sections 856 through 860 of the Code.

         5. REIMBURSEMENT OF UNDERWRITERS' EXPENSES. If the Notes are not
delivered for any reason other than the termination of this Agreement
pursuant to clause (ii), (iii) or (iv) of the second paragraph of Section 7
hereof or pursuant to the last paragraph of Section 8 hereof or the default
by one or more of the Underwriters in its or their respective obligations
hereunder, the Company shall, in addition to paying the amounts described in
Section 4 hereof, reimburse the Underwriters for all of their out-of-pocket
expenses, including the reasonable fees and disbursements of their counsel.

         6. CONDITIONS OF UNDERWRITERS' OBLIGATIONS. The several obligations of
the Underwriters hereunder are subject to the accuracy of the representations
and warranties on the part of the Company on the date hereof and at the time of
purchase the performance by the Company of its obligations hereunder and to the
following additional conditions precedent:

         (a) The Company shall furnish to you at the time of purchase an opinion
    of Sullivan & Worcester LLP, counsel for the Company, addressed to the
    Underwriters, and dated the time of purchase with reproduced copies for each
    of the other Underwriters and in form satisfactory to Dewey Ballantine LLP,
    counsel for the Underwriters, stating that:

                  (i) the Company has been duly formed, is existing as a real
         estate investment trust and is in good standing under the laws of the
         State of Maryland, with trust power to own, lease and operate its
         properties and conduct its business in all material respects as
         described in the Registration Statement and the Prospectus, to execute
         and deliver this Agreement and to issue, sell and deliver the Notes as
         herein contemplated;

                  (ii) the Company is duly qualified to transact business and is
         in good standing in each other jurisdiction in which it owns or leases
         properties, or conducts any business, so as to require such
         qualification, other than those jurisdictions as to which the failure
         to be so qualified or in good standing could not, individually or in
         the aggregate, reasonably be expected to have a Material Adverse
         Effect;

                  (iii) each Subsidiary of the Company identified in SCHEDULE D
         attached hereto (each a "MATERIAL SUBSIDIARY") is a corporation or
         other legal entity duly formed, existing and in good standing under the
         laws of its jurisdiction of organization, and is duly qualified as a
         foreign corporation or other legal entity and is in good standing in
         each jurisdiction in which such qualification is required by law, other
         than those jurisdictions as to which the

                                       15


         failure to be so qualified or in good standing could not, individually
         or in the aggregate, reasonably be expected to have a Material Adverse
         Effect. Each Material Subsidiary has the corporate, trust, partnership
         or other power to own or hold under lease the properties it purports to
         own or hold under lease and to transact the business it transacts and
         proposes to transact. All of the issued and outstanding shares of
         beneficial ownership of, or other ownership interests in, of each
         Material Subsidiary has been duly authorized and validly issued, is
         fully paid and except as to Material Subsidiaries that are
         partnerships, non-assessable, and except for SPTMRT Properties Trust,
         is owned by the Company, directly or through subsidiaries, free and
         clear of any security interest, mortgage, pledge, lien or encumbrance;

                  (iv) this Agreement has been duly authorized, executed and
         delivered by the Company, and is a legal, valid and binding agreement
         of the Company, enforceable in accordance with its terms, except as
         enforcement of the same may be limited by bankruptcy, insolvency,
         moratorium, fraudulent conveyance or other similar laws affecting the
         enforcement of creditors' rights generally and by general equitable
         principles and except as to those provisions relating to indemnities
         for liabilities arising under the Act as to which no opinion need be
         expressed;

                  (v) the Indenture has been duly authorized, executed and
         delivered by the Company and, assuming due authorization, execution and
         delivery by the Trustee, is a legal, valid and binding agreement of the
         Company, enforceable in accordance with its terms, except as
         enforceability of the same may be limited by bankruptcy, insolvency,
         moratorium, fraudulent conveyance or other similar laws affecting
         creditors' rights generally and by general equitable principles. The
         Indenture has been duly qualified under the 1939 Act;

                  (vi) The Notes conform to the description thereof in the
         Prospectus. The Indenture conforms to the description thereof on the
         Prospectus;

                  (vii) the Notes are in a form contemplated by the Indenture,
         and have been duly authorized by all necessary corporate action and
         when the Notes have been duly authenticated by the Trustee as specified
         in the Indenture and delivered against payment therefor in accordance
         with the Agreement, the Notes will be valid and binding obligations of
         the Company enforceable in accordance with its terms (except as
         enforcement thereof may be limited by bankruptcy, insolvency,
         moratorium, fraudulent conveyance and other similar laws relating to or
         affecting creditors' rights generally and by general equitable
         principles), and entitled to the benefits of the Indenture;

                  (viii) the Company has authorized and outstanding shares of
         beneficial interest as set forth or incorporated by reference in the
         Registration Statement and the Prospectus; the outstanding shares of
         beneficial interest of the Company have been duly and validly
         authorized and issued and are fully

                                       16


         paid, nonassessable and free of any preemptive rights, resale rights,
         rights of first refusal and similar rights under any contract,
         agreement or instrument to which the Company is a party described in or
         filed as an exhibit to the Registration Statement or otherwise known to
         such counsel;

                  (ix) the Registration Statement and the Prospectus (except as
         to the financial statements and schedules and other financial and
         statistical data contained therein, as to which such counsel need
         express no opinion) comply as to form in all material respects with the
         requirements of the Act;

                  (x) the Registration Statement has become effective under the
         Act and, to such counsel's knowledge, no stop order proceedings with
         respect thereto are pending or threatened under the Act and any
         required filing of the Prospectus, and any supplement thereto, pursuant
         to Rule 424 under the Act, has been made in the manner and within the
         time period required by such Rule 424;

                  (xi) the issue and sale of the Notes and the compliance by the
         Company with the provisions of the Indenture and this Agreement by the
         Company and the transactions contemplated hereby and thereby do not and
         will not conflict with, or result in any breach of, or constitute a
         violation under (nor constitute any event which with notice, lapse of
         time, or both, would result in any breach of, or constitute a default
         under) (A) any provisions of the Declaration of Trust, charter, by-laws
         or other organizational documents of the Company or any of the Material
         Subsidiaries, (B) any provision of any material agreement or other
         instrument to which the Company or any of the Material Subsidiaries is
         a party or by which their respective properties may be bound or
         affected, that is described in the Prospectus or filed as an exhibit to
         the Registration Statement or any Incorporated Document or is otherwise
         known to such counsel or (C) any federal, state, local or foreign law,
         regulation or rule, or any decree, to which the Company or the Material
         Subsidiaries may be subject;

                  (xii) to such counsel's knowledge, there are no contracts,
         licenses, agreements, leases or documents of a character which are
         required to be filed as exhibits to the Registration Statement or to be
         described in the Prospectus which have not been so filed or described;

                  (xiii) to such counsel's knowledge, except as described in the
         Prospectus or as would not, individually or in the aggregate, have a
         Material Adverse Effect, there are no private or governmental actions,
         suits, claims, investigations or proceedings pending, threatened or
         contemplated to which the Company or any of the Subsidiaries or any of
         their officers is subject or of which any of their properties is
         subject, whether at law, in equity or before or by any federal, state,
         local or foreign governmental or regulatory commission, board, body,
         authority or agency;

                                       17


                  (xiv) to such counsel's knowledge, no person has the right,
         pursuant to the terms of any contract, agreement or other instrument
         described in or filed as an exhibit to the Registration Statement or
         any Incorporated Document, to cause the Company to register under the
         Act any debt securities of the Company as a result of the filing or
         effectiveness of the Registration Statement or the sale of the Notes as
         contemplated hereby, except for such rights as have been complied with
         or waived; and to the knowledge of such counsel, except as described in
         the Registration Statement and Prospectus, no person is entitled to
         registration rights with respect to securities of the Company;

                  (xv) the Company is not, and after the offering and sale of
         the Notes, will not be, an "investment company," or an entity
         controlled by an "investment company," as such terms are defined in the
         Investment Company Act; and

                  (xvi) to such counsel's knowledge the statements in (i) the
         Registration Statement and the Prospectus under the captions
         "Description of notes", "Our tenants and property operations",
         "Description of other indebtedness", "Description of debt securities"
         and "Material federal income tax consequences"; (ii) in the Company's
         Annual Report on Form 10-K for the fiscal year ended December 31, 2000
         under the captions "Business--Financing Policies" (with respect to the
         first paragraph only), "Business--Regulation and Reimbursement",
         "Business--Government Regulations and Rate Setting" and "Federal Income
         Tax Considerations"; and (iii) in the September 21, 2001 8-K under the
         captions "B. Crestline Transaction" and "C. Supplementary Federal
         Income Tax Considerations" in each case insofar as such statements
         purport to summarize matters arising under Maryland, Massachusetts or
         New York law or the federal law of the United States, or provisions of
         documents as to which the Company is a party specifically referred to
         therein, are accurate in all material respects.

         In addition, such counsel shall state that, in the opinion of such
counsel, and subject to the restrictions and limitations set forth in such
counsel's tax opinion filed as an exhibit to the Registration Statement and
reasonably acceptable to you, (a) the Company has qualified to be taxed as a
REIT under the Code for each of its fiscal years and (b) the proposed method of
operation described in the Prospectus and as represented to such counsel by the
Company will enable the Company to continue to satisfy the requirements for such
qualification for subsequent fiscal years under the Code. Such counsel may state
that actual qualification as a REIT, however, will depend upon the Company's
continued ability to meet, and its meeting, through actual annual operating
results and distributions, the various qualifying tests under the Code.

         Also, such counsel shall state that it has participated in conferences
with officers and other representatives of the Company, representatives of the
independent public accountants of the Company and representatives of the
Underwriters at which the contents of the Registration Statement and Prospectus
were discussed and, although such counsel is not passing upon and does not
assume responsibility for the accuracy, completeness or fairness of the
statements

                                       18


contained in the Registration Statement or Prospectus (except as and to the
extent stated in subparagraphs (vi), (ix) and (xvi) above), on the basis of the
foregoing nothing has come to the attention of such counsel that causes them to
believe that the Registration Statement or any amendment thereto at the time
such Registration Statement or amendment became effective contained an untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary to make the statements therein not misleading, or
that the Prospectus or any supplement thereto at the date of the Prospectus
Supplement or such other supplement, and at all times up to and including the
time of purchase contained an untrue statement of a material fact or omitted to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading (it being understood that such counsel need express no opinion
with respect to the financial statements and schedules and other financial and
statistical data and exhibits included or incorporated by reference in the
Registration Statement or Prospectus or as to the Form T-1).

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

                  (b) The Company shall furnish to you at the time of purchase
         an opinion of Ballard Spahr Andrews & Ingersoll, LLP, special Maryland
         counsel of the Company, addressed to the Underwriters, and dated the
         time of purchase with reproduced copies for each of the other
         Underwriters and in form satisfactory to Dewey Ballantine LLP, counsel
         for the Underwriters, stating that:

                           (i) the Company has been duly formed, is existing as
                  a real estate investment trust and is in good standing under
                  the laws of the State of Maryland, with trust power to own,
                  lease and operate its properties and conduct its business in
                  all material respects as described in the Registration
                  Statement and the Prospectus, to execute and deliver this
                  Agreement and to issue, sell and deliver the Notes as herein
                  contemplated;

                           (ii) each Subsidiary of the Company identified in
                  SCHEDULE E attached hereto (each a "MARYLAND SUBSIDIARY") is a
                  corporation or other legal entity duly formed, existing and in
                  good standing under the laws of its jurisdiction of
                  organization. Each Maryland Subsidiary has the trust power to
                  own or hold under lease the properties it purports to own or
                  hold under lease and to transact the business it transacts and
                  proposes to transact. All of the issued and outstanding shares
                  of beneficial interest of each Maryland Subsidiary have been
                  duly authorized and validly issued, is fully paid and
                  non-assessable and is owned by the Company, directly or
                  through

                                       19


                  subsidiaries, and to such counsel's knowledge, except for
                  SPTMRT Properties Trust, free and clear of any security
                  interest, mortgage, pledge, lien, encumbrance, claim or
                  equity;

                           (iii) the execution, delivery and performance of this
                  agreement by the Company and the transactions contemplated
                  hereby and by the Registration Statement do not and will not
                  conflict with, or result in any breach of, or constitute a
                  default under (nor constitute any event which with notice,
                  lapse of time, or both, would result in any breach of, or
                  constitute a default under) (A) any provisions of the
                  Declaration of Trust, charter or by-laws or other
                  organizational documents of the Company or any of the Maryland
                  Subsidiaries or (B) any local or state Maryland law or
                  administrative regulation applicable to the Company and the
                  Maryland Subsidiaries;

                           (iv) the Company has authorized and outstanding
                  shares of beneficial interest as set forth or incorporated by
                  reference in the Registration Statement and the Prospectus;
                  the outstanding shares of beneficial interest of the Company
                  have been duly and validly authorized and issued by all
                  necessary trust action and are fully paid, nonassessable and
                  free of any preemptive rights, resale rights, rights of first
                  refusal and similar rights under the Maryland REIT Law;

                           (v) no approval, authorization, consent or order of
                  or filing with any Maryland governmental or regulatory
                  commission, board, body, authority or agency having
                  jurisdiction over the Company is required in connection with
                  the execution, delivery and performance of this Agreement, the
                  issuance and sale of the Notes being delivered at the time of
                  purchase or and the consummation of the transactions
                  contemplated hereby and by the Prospectus (In rendering the
                  opinion expressed in this paragraph (v), such counsel need
                  express no opinion concerning the securities laws of the State
                  of Maryland.);

                           (vi) to such counsel's knowledge the statements in
                  (i) the Registration Statement and the Prospectus under the
                  caption "Description of certain provisions of Maryland law and
                  of our declaration of trust and bylaws" and in each case
                  insofar as such statements purport to summarize matters
                  arising under Maryland law are accurate in all material
                  respects;

                           (vii) to such counsel's knowledge, neither the
                  Company nor any of the Maryland Subsidiaries is in violation
                  of its Declaration of Trust, charter or by-laws or other
                  organizational documents or in violation of any local or state
                  Maryland law or administrative regulation applicable to the
                  Company and the Maryland Subsidiaries; and

                           (viii) except as described in the Registration
                  Statement and the Prospectus, all of the outstanding shares of
                  capital stock of each of the

                                       20


                  Maryland Subsidiaries that is a REIT have been duly authorized
                  and validly issued, are fully paid and non-assessable, are
                  owned by the Company.

                  (c) You shall have received at the time of purchase an opinion
         of Dewey Ballantine LLP, counsel for the Underwriters, dated the time
         of purchase with respect to the issuance and sale of the Notes by the
         Company, the Registration Statement, the Prospectus and such other
         related matters as the Underwriters may require. In addition, Dewey
         Ballantine LLP may rely on the opinion of Ballard Spahr Andrews &
         Ingersoll, LLP as to all matters of Maryland law.

                  (d) You shall have received from Ernst & Young LLP, a letter
         dated, respectively, the date of this Agreement and the time of
         purchase and addressed to the Underwriters (with reproduced copies for
         each of the Underwriters) in the forms approved by Dewey Ballantine
         LLP, counsel for the Underwriters.

                  (e) You shall have received from KPMG LLP, a letter dated,
         respectively, the date of this Agreement and addressed to the
         Underwriters (with reproduced copies for each of the Underwriters) in
         the form approved by Dewey Ballantine LLP, counsel for the
         Underwriters.

                  (f) You shall have received from Arthur Andersen LLP, a letter
         dated, respectively, the date of this Agreement and the time of
         purchase and addressed to the Underwriters (with reproduced copies for
         each of the Underwriters) in the forms approved by Dewey Ballantine
         LLP, counsel for the Underwriters.

                  (g) No amendment or supplement to the Registration Statement
         or Prospectus, including documents deemed to be incorporated by
         reference therein, shall have been to which you have objected in
         writing.

                  (h) Prior to the time of purchase (i) no stop order with
         respect to the effectiveness of the Registration Statement shall have
         been issued under the Act or proceedings initiated under Section 8(d)
         or 8(e) of the Act; (ii) the Registration Statement and all amendments
         thereto, or modifications thereof, if any, shall not contain an untrue
         statement of a material fact or omit to state a material fact required
         to be stated therein or necessary to make the statements therein not
         misleading; and (iii) the Prospectus and all amendments or supplements
         thereto, or modifications thereof, if any, shall not contain an untrue
         statement of a material fact or omit to state a material fact required
         to be stated therein or necessary to make the statements therein, in
         the light of the circumstances under which they are made, not
         misleading.

                  (i) Between the time of execution of this Agreement and the
         time of purchase (i) no material and unfavorable change, financial or
         otherwise (other than as referred to in the Registration Statement and
         Prospectus), in the business, prospects, properties, condition of the
         Company and the Subsidiaries taken as a whole shall occur or become
         known and (ii) no transaction which is material and unfavorable to the
         Company and the Subsidiaries taken as a whole shall have been entered
         into by the Company or any of the Subsidiaries.

                                       21


                  (j) Between the time of execution of this Agreement and the
         time of purchase there shall not have occurred any downgrading, nor
         shall any notice or announcement have been given or made of (i) any
         intended or potential downgrading or (ii) any review or possible change
         that does not indicate an improvement, in the rating accorded any
         securities of or guaranteed by the Company by any "nationally
         recognized statistical rating organization," as that term is defined in
         Rule 436(g)(2) under the Act.

                  (k) The Company will at the time of purchase deliver to you a
         certificate of two of its executive officers to the effect that the
         representations and warranties of the Company as set forth in this
         Agreement are true and correct as of such date, that the Company has
         performed such of its obligations under this Agreement as are to be
         performed at or before the time of purchase and the conditions set
         forth in paragraphs (g), (h), (i) and (j) of this Section 6 have been
         met.

                  (l) The Company will, at the time of purchase deliver to you a
         certificate signed by the President of the Company substantially in
         such form approved by you and counsel to the Underwriters, respecting
         the Company's compliance, both prior to and after giving effect to the
         transactions contemplated hereby, with the financial covenants set
         forth in the Company's credit agreement and certain other agreements
         and instruments respecting outstanding indebtedness of the Company and
         the Subsidiaries.

                  (m) The Company shall have furnished to you such other
         documents and certificates as to the accuracy and completeness of any
         statement in the Registration Statement and the Prospectus as of the
         time of purchase as you may reasonably request.

         7. EFFECTIVE DATE OF AGREEMENT; TERMINATION. This Agreement shall
become effective: (i) upon the execution and delivery hereof by the parties
hereto; or (ii) if, at the time this Agreement is executed and delivered, it is
necessary for the registration statement or a post-effective amendment thereto
or an Abbreviated Registration Statement to be declared or become effective
before the offering of the Notes may commence, when notification of the
effectiveness of the registration statement or such post-effective amendment has
been released by the Commission or such Abbreviated Registration Statement has,
pursuant to the provisions of Rule 462 under the Act, become effective. Until
such time as this Agreement shall have become effective, it may be terminated by
the Company, by notifying you, or by you, as Underwriters, by notifying the
Company.

         The obligations of the several Underwriters hereunder shall be subject
to termination in the absolute discretion of you or any group of Underwriters
(which may include you) which has agreed to purchase in the aggregate at least
50% of the aggregate principal amount of the Notes (i) if, since the time of
execution of this Agreement or the respective dates as of which information is
given in the Registration Statement and Prospectus, (y) there has been any
material adverse and unfavorable change, financial or otherwise (other than as
referred to in the Registration Statement and Prospectus), in the business,
prospects, properties, condition (financial or otherwise) or results of
operations of the Company and the Subsidiaries taken as a whole, which would, in
your judgment or in the judgment of such group of Underwriters, make it
impracticable to market the Notes, or (z) there shall have occurred any
downgrading, or any notice shall have been given of (a) any intended or
potential downgrading or (b) any review or

                                       22


possible change that does not indicate an improvement, in the rating accorded
any securities of or guaranteed by the Company or any of the Subsidiaries by any
"nationally recognized statistical rating organization", as that term is defined
in Rule 436(g)(2) under the Act or (ii) if, at any time prior to the time of
purchase trading in securities on the NYSE, the American Stock Exchange or the
Nasdaq Stock Market Inc. ("Nasdaq") shall have been suspended or limitations or
minimum prices shall have been established on the NYSE, the American Stock
Exchange or the Nasdaq or (iii) if, at any time prior to the time of purchase a
banking moratorium shall have been declared either by the United States or New
York State authorities, or (iv) if, at any time prior to the time of purchase
the United States shall have declared war in accordance with its constitutional
processes or there shall have occurred any material outbreak or escalation of
hostilities or other national or international calamity or crisis of such
magnitude in its effect on the financial markets of the United States as, in
your judgment or in the judgment of such group of Underwriters, to make it
impracticable to market the Notes.

         If you or any group of Underwriters elects to terminate this Agreement
as provided in this Section 7, the Company and each other Underwriter shall be
notified promptly by letter, telegram or telecopy.

         If the sale to the Underwriters of the Notes, as contemplated by this
Agreement, is not carried out by the Underwriters for any reason permitted under
this Agreement or if such sale is not carried out because the Company shall be
unable to comply with any of the terms of this Agreement, the Company shall not
be under any obligation or liability under this Agreement (except to the extent
provided in Sections 4, 5 and 9 hereof), and the Underwriters shall be under no
obligation or liability to the Company under this Agreement (except to the
extent provided in Section 9 hereof) or to one another hereunder.

         8. INCREASE IN UNDERWRITERS' COMMITMENTS. Subject to Sections 6 and 7,
if any Underwriter shall default in its obligation to take up and pay for the
Notes to be purchased by it hereunder (otherwise than for reasons sufficient to
justify the termination of this Agreement under the provisions of Section 7
hereof) and if the principal amount of the Notes which all Underwriters so
defaulting shall have agreed but failed to take up and pay for does not exceed
10% of the total aggregate principal amount of the Notes, the non-defaulting
Underwriters shall take up and pay for (in addition to the principal amount of
the Notes they are obligated to purchase pursuant to Section 1 hereof) the
principal amount of the Notes agreed to be purchased by all such defaulting
Underwriters, as hereinafter provided. Such Notes shall be taken up and paid for
by such non-defaulting Underwriter or Underwriters in such numbers as you may
designate with the consent of each Underwriter so designated or, in the event no
such designation is made, such Notes shall be taken up and paid for by all
non-defaulting Underwriters pro rata in proportion to the aggregate principal
amount of the Notes set opposite the names of such non-defaulting Underwriters
in SCHEDULE A.

         If a new Underwriter or Underwriters are substituted by the
Underwriters or by the Company for a defaulting Underwriter or Underwriters in
accordance with the foregoing provision, the Company or you shall have the right
to postpone the time of purchase for a period not exceeding five business days
in order that any necessary changes in the Prospectus and other documents may be
effected.

                                       23


         The term Underwriter as used in this agreement shall refer to and
include any Underwriter substituted under this Section 8 with like effect as if
such substituted Underwriter had originally been named in SCHEDULE A.

         If the aggregate principal amount of the Notes which the defaulting
Underwriter or Underwriters agreed to purchase exceeds 10% of the total
aggregate principal amount of the Notes which all Underwriters agreed to
purchase hereunder, and if neither the non-defaulting Underwriters nor the
Company shall make arrangements within the five business day period stated above
for the purchase of all the principal amount of the Notes which the defaulting
Underwriter or Underwriters agreed to purchase hereunder, this Agreement shall
be terminated without further act or deed and without any liability on the part
of the Company to any non-defaulting Underwriter and without any liability on
the part of any non-defaulting Underwriter to the Company. Nothing in this
paragraph, and no action taken hereunder, shall relieve any defaulting
Underwriter from liability in respect of any default of such Underwriter under
this Agreement.

         9. INDEMNITY AND CONTRIBUTION.

         (a) The Company agrees to indemnify, defend and hold harmless each
Underwriter, its partners, directors, officers, employees and agents and any
person who controls any Underwriter within the meaning of Section 15 of the Act
or Section 20 of the Exchange Act, and the successors and assigns of all of the
foregoing persons, from and against any loss, damage, expense, liability or
claim (including the reasonable cost of investigation) which, jointly or
severally, any such Underwriter or any such person may incur under the Act, the
Exchange Act, the common law or otherwise, insofar as such loss, damage,
expense, liability or claim arises out of or is based upon (i) any untrue
statement or alleged untrue statement of a material fact contained in the
Registration Statement, the Basic Prospectus, any Prepricing Prospectus, any
Prospectus Supplement or in the Prospectus (or in any of the foregoing as the
same may at any time be amended or supplemented), or arises out of or is based
upon any omission or alleged omission to state a material fact required to be
stated in the Registration Statement, the Basic Prospectus, any Prepricing
Prospectus, any Prospectus Supplement or the Prospectus (or in any of the
foregoing as the same may at any time be amended or supplemented) or necessary
to make the statements made therein not misleading, except insofar as any such
loss, damage, expense, liability or claim arises out of or is based upon any
untrue statement or alleged untrue statement of a material fact contained in and
in conformity with information furnished by or on behalf of any Underwriter
through you to the Company expressly for use with reference to such Underwriter
in the Registration Statement, the Basic Prospectus, any Prepricing Prospectus,
any Prospectus Supplement or the Prospectus (or in any of the foregoing as the
same may at any time be amended or supplemented) or arises out of or is based
upon any omission or alleged omission to state a material fact in connection
with such information required to be stated in the Registration Statement, the
Basic Prospectus, any Prepricing Prospectus, any Prospectus Supplement or the
Prospectus (or in any of the foregoing as the same may at any time be amended or
supplemented) or necessary to make such information not misleading or (ii) any
untrue statement or alleged untrue statement made by the Company in Section 3 of
this Agreement or the failure by the Company to perform when and as required any
agreement or covenant contained herein or (iii) any untrue statement or alleged
untrue statement of any material fact contained in any audio or visual materials
provided by the Company or based upon

                                       24


written information furnished by or, with the approval of the Company, on behalf
of the Company including, without limitation, slides, videos, films, tape
recordings, used in connection with the marketing of the Notes; PROVIDED,
however, that, solely with regard to clause (i), the foregoing indemnity
agreement with respect to any Basic Prospectus or Prepricing Prospectus shall
not inure to the benefit of any Underwriter from whom the person asserting such
losses, claims, damages or liabilities purchased Securities, or any person
controlling the Underwriter, if sufficient copies of the Prospectus were timely
delivered to such Underwriter pursuant to Section 4 hereof and a copy of the
Prospectus (as then amended or supplemented if the Company shall have furnished
any amendments or supplements thereto) was not given or sent to such person, if
required by law to have been delivered, at or prior to the written confirmation
of the sale of the Securities to such person, and if the Prospectus (as so
amended or supplemented) would have cured the defect giving rise to such losses,
claims, damages or liabilities.

         If any action, suit or proceeding (together, a "PROCEEDING") is brought
against an Underwriter or any such person in respect of which indemnity may be
sought against the Company pursuant to the foregoing paragraph, such Underwriter
or such person shall promptly notify the Company in writing of the institution
of such Proceeding and the Company shall assume the defense of such Proceeding,
including the employment of counsel reasonably satisfactory to such indemnified
party and payment of all fees and expenses related thereto; PROVIDED, HOWEVER,
that the omission to so notify the Company shall not relieve the Company from
any liability which the Company may have to any Underwriter or any such person
or otherwise. Such Underwriter or such person shall have the right to employ its
or their own counsel in any such case, but the fees and expenses of such counsel
shall be at the expense of such Underwriter or of such person unless the
employment of such counsel shall have been authorized in writing by the Company
in connection with the defense of such Proceeding or the Company shall not have,
within a reasonable period of time in light of the circumstances, employed
counsel to have charge of the defense of such Proceeding or such indemnified
party or parties shall have reasonably concluded that there may be defenses
available to it or them which are different from, additional to or in conflict
with those available to the Company (in which case the Company shall not have
the right to direct the defense of such Proceeding on behalf of the indemnified
party or parties), in any of which events such fees and expenses shall be borne
by the Company and paid as incurred (it being understood, however, that the
Company shall not be liable for the expenses of more than one separate counsel
(in addition to any local counsel) in any one Proceeding or series of related
Proceedings in the same jurisdiction representing the indemnified parties who
are parties to such Proceeding). The Company shall not be liable for any
settlement of any such Proceeding effected without its prior written consent but
if settled with the prior written consent of the Company, the Company agrees to
indemnify and hold harmless any Underwriter and any such person from and against
any loss or liability by reason of such settlement. Notwithstanding the
foregoing sentence, if at any time an indemnified party shall have requested an
indemnifying party to reimburse the indemnified party for fees and expenses of
counsel as contemplated by the second sentence of this paragraph, then the
indemnifying party agrees that it shall be liable for any settlement of any
Proceeding effected without its written consent if (i) such settlement is
entered into more than 60 business days after receipt by such indemnifying party
of the aforesaid request, (ii) such indemnifying party shall not have reimbursed
the indemnified party in accordance with such request prior to the date of such
settlement and (iii) such indemnified party shall have given the indemnifying
party at least 30 days' prior notice of its intention to settle. No indemnifying
party shall, without the prior

                                       25


written consent of the indemnified party, effect any settlement of any pending
or threatened Proceeding in respect of which any indemnified party is or could
have been a party and indemnity could have been sought hereunder by such
indemnified party, unless such settlement includes an unconditional release of
such indemnified party from all liability on claims that are the subject matter
of such Proceeding and does not include an admission of fault, culpability or a
failure to act, by or on behalf of such indemnified party.

         (b) Each Underwriter severally agrees to indemnify, defend and hold
harmless the Company, its trustees, officers, employees and agents, and any
person who controls the Company within the meaning of Section 15 of the Act, or
Section 20 of the Exchange Act, from and against any loss, damage, expense,
liability or claim (including the reasonable cost of investigation) which,
jointly or severally, the Company or any such person may incur under the Act,
the Exchange Act, or common law or otherwise, insofar as such loss, damage,
expense, liability or claim arises out of or is based upon any untrue statement
or alleged untrue statement of a material fact contained in and in conformity
with information furnished by or on behalf of such Underwriter through you to
the Company expressly for use with reference to such Underwriter in the
Registration Statement, the Basic Prospectus, any Prepricing Prospectus, the
Prospectus Supplement or in the Prospectus (or in any of the foregoing as such
document may at any time be amended or supplemented) or arises out of or is
based upon any omission or alleged omission to state a material fact in
connection with such information required to be stated in the Registration
Statement, the Basic Prospectus, any Prepricing Prospectus, the Prospectus
Supplement or the Prospectus (or in any of the foregoing as such document may at
any time be amended or supplemented) or necessary to make such information not
misleading.

         If any Proceeding is brought against the Company or any such person in
respect of which indemnity may be sought against any Underwriter pursuant to the
foregoing paragraph, the Company or such person shall promptly notify such
Underwriter in writing of the institution of such Proceeding and such
Underwriter shall assume the defense of such Proceeding, including the
employment of counsel reasonably satisfactory to such indemnified party and
payment of all fees and expenses, PROVIDED, HOWEVER, that the omission to so
notify such Underwriter shall not relieve such Underwriter from any liability
which such Underwriter may have to the Company or any such person or otherwise.
The Company or such person shall have the right to employ its own counsel in any
such case, but the fees and expenses of such counsel shall be at the expense of
the Company or such person unless the employment of such counsel shall have been
authorized in writing by such Underwriter in connection with the defense of such
Proceeding or such Underwriter shall not have employed counsel to have charge of
the defense of such Proceeding or such indemnified party or parties shall have
reasonably concluded that there may be defenses available to it or them which
are different from or additional to or in conflict with those available to such
Underwriter (in which case such Underwriter shall not have the right to direct
the defense of such Proceeding on behalf of the indemnified party or parties,
but such Underwriter may employ counsel and participate in the defense thereof
but the fees and expenses of such counsel shall be at the expense of such
Underwriter), in any of which events such fees and expenses shall be borne by
such Underwriter and paid as incurred (it being understood, however, that such
Underwriter shall not be liable for the expenses of more than one separate
counsel (in addition to any local counsel) in any one Proceeding or series of
related Proceedings in the same jurisdiction representing the indemnified
parties who are parties to such Proceeding). No Underwriter shall be liable for
any settlement of any such Proceeding effected without the

                                       26


written consent of such Underwriter but if settled with the written consent of
such Underwriter, such Underwriter agrees to indemnify and hold harmless the
Company and any such person from and against any loss or liability by reason of
such settlement. Notwithstanding the foregoing sentence, if at any time an
indemnified party shall have requested an indemnifying party to reimburse the
indemnified party for fees and expenses of counsel as contemplated by the second
sentence of this paragraph, then the indemnifying party agrees that it shall be
liable for any settlement of any Proceeding effected without its written consent
if (i) such settlement is entered into more than 60 business days after receipt
by such indemnifying party of the aforesaid request, (ii) such indemnifying
party shall not have reimbursed the indemnified party in accordance with such
request prior to the date of such settlement and (iii) such indemnified party
shall have given the indemnifying party at least 30 days' prior notice of its
intention to settle. No indemnifying party shall, without the prior written
consent of the indemnified party, effect any settlement of any pending or
threatened Proceeding in respect of which any indemnified party is or could have
been a party and indemnity could have been sought hereunder by such indemnified
party, unless such settlement includes an unconditional release of such
indemnified party from all liability on claims that are the subject matter of
such Proceeding.

         (c) If the indemnification provided for in this Section 9 is
unavailable to an indemnified party under subsections (a) and (b) of this
Section 9 in respect of any losses, damage, expenses, liabilities or claims
referred to therein, then each applicable indemnifying party, in lieu of
indemnifying such indemnified party, shall contribute to the amount paid or
payable by such indemnified party as a result of such losses, damages, expenses,
liabilities or claims (i) in such proportion as is appropriate to reflect the
relative benefits received by the Company on the one hand and the Underwriters
on the other hand from the offering of the Notes or (ii) if the allocation
provided by clause (i) above is not permitted by applicable law, in such
proportion as is appropriate to reflect not only the relative benefits referred
to in clause (i) above but also the relative fault of the Company on the one
hand and of the Underwriters on the other in connection with the statements or
omissions which resulted in such losses, damages, expenses, liabilities or
claims, as well as any other relevant equitable considerations. The relative
benefits received by the Company on the one hand and the Underwriters on the
other shall be deemed to be in the same respective proportion as the total
proceeds from the offering (net of underwriting discounts and commissions but
before deducting expenses) received by the Company and the total underwriting
discounts and commissions received by the Underwriters, bear to the aggregate
public offering price of the Notes. The relative fault of the Company on the one
hand and of the Underwriters on the other shall be determined by reference to,
among other things, whether the untrue statement or alleged untrue statement of
a material fact or omission or alleged omission relates to information supplied
by the Company or by the Underwriters and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
statement or omission. The amount paid or payable by a party as a result of the
losses, damages, expenses, liabilities and claims referred to in this subsection
shall be deemed to include any legal or other fees or expenses reasonably
incurred by such party in connection with investigating, preparing to defend or
defending any claim or Proceeding.

         (d) The Company and the Underwriters agree that it would not be just
and equitable if contribution pursuant to this Section 9 were determined by pro
rata allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation that does not take account of the
equitable considerations referred to in subsection (c)

                                       27


above. Notwithstanding the provisions of this Section 9, no Underwriter shall be
required to contribute any amount in excess of the amount by which the total
price at which the Notes underwritten by such Underwriter and distributed to the
public were offered to the public exceeds the amount of any damage which such
Underwriter has otherwise been required to pay by reason of such untrue
statement or alleged untrue statement or omission or alleged omission. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Act) shall be entitled to contribution from any person who was not guilty of
such fraudulent misrepresentation. The Underwriters' obligations to contribute
pursuant to this Section 9 are several in proportion to their respective
underwriting commitments and not joint.

         (e) The indemnity and contribution agreements contained in this Section
9 and the covenants, warranties and representations of the Company contained in
this Agreement shall remain in full force and effect regardless of any
investigation made by or on behalf of any Underwriter, its partners, directors,
officers, employees or agents or any person (including each partner, officer,
director, employee or agent of such person) who controls any Underwriter within
the meaning of Section 15 of the Act or Section 20 of the Exchange Act, or by or
on behalf of the Company, its trustees, officers, employees or agents or any
person who controls the Company within the meaning of Section 15 of the Act or
Section 20 of the Exchange Act, and shall survive any termination of this
Agreement or the issuance and delivery of the Notes. The Company and each
Underwriter agree promptly to notify each other of the commencement of any
Proceeding against it and, in the case of the Company, against any of the
Company's officers, trustees, employees or agents in connection with the
issuance and sale of the Notes, or in connection with the Registration Statement
or Prospectus.

         10. NOTICES. Except as otherwise herein provided, all statements,
requests, notices and agreements shall be in writing or by telegram and, if to
the Underwriters, shall be sufficient in all respects if delivered or sent to
UBS Warburg LLC, 299 Park Avenue, New York, New York 10171, Attention: Syndicate
Department, with a copy to Dewey Ballantine LLP, 1301 Avenue of the Americas,
New York, New York 10019, Attention: Frederick W. Kanner, and if to the Company,
shall be sufficient in all respects if delivered or sent to the Company at the
offices of the Company at 400 Centre Street, Newton, Massachusetts 02458,
Attention: David J. Hegarty, President and Chief Operating Officer, with a copy
to Sullivan & Worcester LLP, One Post Office Square, Boston, Massachusetts
02109, Attention: Alexander A. Notopoulos, Jr., Esq.

         11. GOVERNING LAW; CONSTRUCTION. This Agreement and any claim,
counterclaim or dispute of any kind or nature whatsoever arising out of or in
any way relating to this Agreement (a "CLAIM"), directly or indirectly, shall be
governed by, and construed in accordance with, the laws of the State of New
York. The Section headings in this Agreement have been inserted as a matter of
convenience of reference and are not a part of this Agreement.

         12. SUBMISSION TO JURISDICTION. Except as set forth below, no Claim may
be commenced, prosecuted or continued in any court other than the courts of the
State of New York located in the City and County of New York or in the United
States District Court for the Southern District of New York, which courts shall
have jurisdiction over the adjudication of such matters, and the Company
consents to the jurisdiction of such courts and personal service with respect
thereto. The Company hereby consents to personal jurisdiction, service and venue
in any court in which any Claim arising out of or in any way relating to this
Agreement is brought by

                                       28


any third party against an Underwriter or any indemnified party. Each
Underwriter and the Company (on its behalf and, to the extent permitted by
applicable law, on behalf of its stockholders and affiliates) waives all right
to trial by jury in any action, proceeding or counterclaim (whether based upon
contract, tort or otherwise) in any way arising out of or relating to this
Agreement. The Company agrees that a final judgment in any such action,
proceeding or counterclaim brought in any such court shall be conclusive and
binding upon the Company and may be enforced in any other courts in the
jurisdiction of which the Company is or may be subject, by suit upon such
judgment.

         13. PARTIES AT INTEREST. The Agreement herein set forth has been and is
made solely for the benefit of the Underwriters, the Company and to the extent
provided in Section 9 hereof the controlling persons, directors and officers
and, if applicable, trustees referred to in such Section, and their respective
successors, assigns, heirs, personal representatives and executors and
administrators. No other person, partnership, association or corporation
(including a purchaser, as such purchaser, from any of the Underwriters) shall
acquire or have any right under or by virtue of this Agreement.

         14. INFORMATION FURNISHED BY THE UNDERWRITERS. The statements set forth
in the pertinent sentence on the last paragraph on the cover page of the
Prospectus Supplement and the statements set forth in the third and seventh
paragraphs under the caption "Underwriting" in the Prospectus Supplement
constitute the only information furnished by or on behalf of the Underwriters as
such information is referred to in Sections 3 and 9 hereof.

         15. COUNTERPARTS. This Agreement may be signed by the parties in one or
more counterparts that together shall constitute one and the same agreement
among the parties.

         16. SUCCESSORS AND ASSIGNS. This Agreement shall be binding upon the
Underwriters, the Company and their respective successors and assigns and any
successor or assign of any substantial portion of the Company's and any of the
Underwriters' respective businesses and/or assets.

         17. MISCELLANEOUS. Each of the Underwriters is not a bank. Each of the
Underwriters is a separate entity from its lending and other affiliates and is
solely responsible for its own contractual obligations and commitments,
including obligations with respect to sales and purchases of securities.
Securities sold, offered or recommended by any of the Underwriters are not
deposits, are not insured by the Federal Deposit Insurance Corporation, are not
guaranteed by a branch or agency, and are not otherwise an obligation or
responsibility of a branch or agency.

         Lending affiliates of each of the Underwriters may have lending
relationships with issuers of securities underwritten or privately placed by one
or more of the Underwriters. To the extent required under the securities laws,
the Prospectus will disclose the existence of any such lending relationships and
whether the proceeds of the issue will be used to repay debts owed to affiliates
of any of the Underwriters.

         THE ARTICLES OF AMENDMENT AND RESTATEMENT ESTABLISHING SENIOR HOUSING
PROPERTIES TRUST, DATED SEPTEMBER 2, 1999, A COPY OF WHICH, TOGETHER WITH ALL
AMENDMENTS THERETO, IS

                                       29


DULY FILED IN THE OFFICE OF THE DEPARTMENT OF ASSESSMENTS AND TAXATION OF THE
STATE OF MARYLAND, PROVIDES THAT THE NAME "SENIOR HOUSING PROPERTIES TRUST"
REFERS TO THE TRUSTEES UNDER THE DECLARATION OF TRUST, BUT NOT INDIVIDUALLY OR
PERSONALLY, AND THAT NO TRUSTEE, OFFICER, SHAREHOLDER, EMPLOYEE OR AGENT OF
SENIOR HOUSING PROPERTIES TRUST SHALL BE HELD TO ANY PERSONAL LIABILITY, FOR ANY
OBLIGATION OF, OR CLAIM AGAINST, SENIOR HOUSING PROPERTIES TRUST. ALL PERSONS
DEALING WITH SENIOR HOUSING PROPERTIES TRUST, SHALL LOOK ONLY TO THE ASSETS OF
SENIOR HOUSING PROPERTIES TRUST FOR THE PAYMENT OF ANY SUM OR THE PERFORMANCE OF
ANY OBLIGATION.



                                       30


         If the foregoing correctly sets forth the understanding between the
Company and the Underwriters, please so indicate in the space provided below for
the purpose, whereupon this letter and your acceptance shall constitute a
binding agreement between the Company and the Underwriters severally.

                                   Very truly yours,

                                   SENIOR HOUSING PROPERTIES TRUST

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

Accepted and agreed to
as of the date first above written:

UBS WARBURG LLC
DRESDNER KLEINWORT WASSERSTEIN
         --GRANTCHESTER, INC.
FIRST UNION SECURITIES, INC.
BMO NESBITT BURNS CORP.
CIBC WORLD MARKETS CORP.
PNC CAPITAL MARKETS, INC.
SG COWEN SECURITIES CORPORATION

By: UBS WARBURG LLC

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

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


                                       31


                                   SCHEDULE A



                                                                                                  PRINCIPAL AMOUNT
UNDERWRITER                                                                                               OF NOTES
                                                                                               
UBS Warburg LLC...............................................................................         120,000,000
Dresdner Kleinwort Wasserstein
- --Grantchester, Inc...........................................................................          20,000,000
First Union Securities, Inc...................................................................          20,000,000
BMO Nesbitt Burns Corp........................................................................          10,000,000
CIBC World Markets Corp.......................................................................          10,000,000
PNC Capital Markets, Inc......................................................................          10,000,000
SG Cowen Securities Corporation...............................................................          10,000,000
                                                                                                  ----------------
                                            Total.............................................        $200,000,000
                                                                                                  ================


                                  Schedule A-1



                                   SCHEDULE B

SUBSIDIARY NAME

Five Star Quality Care Holding Co., Inc.
Five Star Quality Care Trust
Five Star Quality Care, Inc.
Five Star Quality Care-AZ, LLC
Five Star Quality Care-CA, Inc.
Five Star Quality Care-CA, LLC
Five Star Quality Care-Colorado, LLC
Five Star Quality Care-CT, LLC
Five Star Quality Care-GA, LLC
Five Star Quality Care-IA, Inc.
Five Star Quality Care-IA, LLC
Five Star Quality Care-KS, LLC
Five Star Quality Care-MI, Inc.
Five Star Quality Care-MI, LLC
Five Star Quality Care-MO, LLC
Five Star Quality Care-NE, Inc.
Five Star Quality Care-NE, LLC
Five Star Quality Care-WI, LLC
Five Star Quality Care-WY, LLC
FS Lafayette Tenant Trust
FS Lexington Tenant Trust
FS Tenant Pool I Trust
FS Tenant Pool III Trust
FS Tenant Pool IV Trust
FSQ Acquisition, Inc.
HRES1 Properties Trust
HRES2 Properties Trust
SHOPCO-SD, LLC
SNH Capital Trust Holdings
SNH Capital Trust I
SNH Capital Trust II
SNH Capital Trust III
SNH/CSL Properties Trust
SPTGEN Properties Trust
SPTIHS Properties Trust
SPTMISC Properties Trust
SPTMNR Properties Trust
SPTMRT Properties Trust
SPTSUN II Properties Trust
SPTSUN Properties Trust

                                  Schedule B-1



                                   SCHEDULE C

Five Star Quality Care Trust
FS Lafayette Tenant Trust
FS Lexington Tenant Trust
FS Tenant Pool I Trust
FS Tenant Pool III Trust
FS Tenant Pool IV Trust










                                  Schedule C-1



                                   SCHEDULE D

MATERIAL SUBSIDIARIES

HRES1 Properties Trust
SPTMRT Properties Trust












                                  Schedule D-1



                                   SCHEDULE E

MARYLAND SUBSIDIARIES

Five Star Quality Care, Inc.
HRES1 Properties Trust
HRES2 Properties Trust
SNH Capital Trust Holdings
SNH Capital Trust I
SNH Capital Trust II
SNH Capital Trust III
SNH/CSL Properties Trust
SPTGEN Properties Trust
SPTIHS Properties Trust
SPTMISC Properties Trust
SPTMNR Properties Trust
SPTMRT Properties Trust
SPTSUN Properties Trust
SPTSUN II Properties Trust








                                  Schedule E-1