Exhibit 1.1

                      LIBERTY PROPERTY LIMITED PARTNERSHIP

                      (a Pennsylvania Limited Partnership)

                    $85,000,000 6.375% SENIOR NOTES DUE 2012

                             UNDERWRITING AGREEMENT

                                                                January 10, 2003

Credit Suisse First Boston Corporation
UBS Warburg LLC

c/o Credit Suisse First Boston Corporation
Eleven Madison Avenue
New York, New York 10010

Dear Sirs:

Liberty Property Trust, a Maryland real estate investment trust (the "Company"),
and Liberty Property Limited Partnership, a Pennsylvania limited partnership
(the "Operating Partnership" and, together with the Company, the "Transaction
Entities"), each wishes to confirm as follows its agreement with Credit Suisse
First Boston Corporation ("CSFB") and UBS Warburg LLC (the "Underwriters," which
term shall also include any underwriter substituted as hereinafter provided in
Section 9 of this Agreement), with respect to the sale by the Operating
Partnership and the purchase by the Underwriters, acting severally and not
jointly, of $85,000,000 aggregate principal amount of its 6.375% Senior Notes
due 2012 (the "Notes"), as further described on Schedule II hereto.

            Capitalized terms used but not otherwise defined herein shall have
the meanings given to those terms in the Prospectus (as herein defined).

            1. Representations, Warranties and Agreements of the Transaction
Entities. Each of the Transaction Entities, jointly and severally, represents,
warrants and agrees that, as of the date hereof:

                  (a) A registration statement on Form S-3 (No. 333-39282) (the
            "Registration Statement") and any amendments thereto, with respect
            to one or more series of debt securities of the Operating
            Partnership has (i) been prepared by the Company and the Operating
            Partnership in conformity with the requirements of the United States
            Securities Act of 1933, as amended (the "Securities Act") and the
            rules and regulations (the "Rules and Regulations") of the United
            States Securities and Exchange Commission (the "Commission")
            thereunder, (ii) been filed with the Commission under the Securities
            Act and (iii) become effective under the Securities Act; and the
            indenture, dated as of October 24, 1997 as supplemented to the date
            hereof (the "Indenture"), between the

            Operating Partnership and Bank One Trust Company, N.A. (as successor
            to The First National Bank of Chicago), as trustee (the "Trustee")
            has been qualified, and the Sixth Supplemental Indenture, dated as
            of August 22, 2002, between the Operating Partnership and the
            Trustee (the "Supplemental Indenture"), pursuant to which the Notes
            shall be issued, has been qualified, under the Trust Indenture Act
            of 1939 (the "Trust Indenture Act"). Copies of such registration
            statement and any amendments thereto have been delivered by the
            Company to you. As used in this Agreement, "Effective Time" means,
            for the Registration Statement, the date and the time as of which
            the Registration Statement, or the most recent post-effective
            amendment thereto, if any, was declared effective by the Commission;
            "Effective Date" means, for the Registration Statement, the date of
            the Effective Time; "Preliminary Prospectus" means any prospectus
            included in the Registration Statement, or amendments thereto,
            before it became effective under the Securities Act and any
            prospectus filed with the Commission by the Company with the consent
            of the Underwriters pursuant to Rule 424(a) of the Rules and
            Regulations; "Registration Statement" means the Registration
            Statement, as amended at the Effective Time, including any documents
            incorporated by reference therein at such time and all information
            contained in the final prospectus filed with the Commission pursuant
            to Rule 424(b) of the Rules and Regulations and deemed to be a part
            of such registration statement as of the respective Effective Time
            pursuant to paragraph (b) of Rule 430A of the Rules and Regulations,
            and shall include any registration statement filed pursuant to Rule
            462(b) of the Rules and Regulations; and "Prospectus" means such
            final prospectus, as first filed with the Commission pursuant to
            paragraph (1) or (4) of Rule 424(b) of the Rules and Regulations.
            Any reference herein to the Registration Statement, the Prospectus
            or a Preliminary Prospectus shall be deemed to include the documents
            incorporated or deemed to be incorporated by reference therein which
            were filed under the Securities and Exchange Act of 1934, as amended
            (the "Exchange Act"). For purposes of this Agreement, all references
            to the Registration Statement, any Preliminary Prospectus or the
            Prospectus or any amendment or supplement to any of the foregoing
            shall be deemed to include the copy filed with the Commission
            pursuant to its Electronic Data Gathering, Analysis and Retrieval
            system ("EDGAR").

                  (b) Each Preliminary Prospectus, if any, included as part of
            the Registration Statement as originally filed or as part of any
            amendment or supplement thereto, or filed pursuant to Rule 424 under
            the Rules and Regulations, complied when so filed in all material
            respects with the provisions of the Securities Act and the rules and
            regulations thereunder, and each Preliminary Prospectus, if any,
            delivered to the Underwriters for use in connection with this
            offering was identical to the electronically transmitted copies
            thereof filed with the Commission pursuant to EDGAR, except to the
            extent permitted by Regulation S-T.

                  (c) On its Effective Date and on the Effective Date of any
            amendment thereto, the Registration Statement conformed in all
            material

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            respects, and as of the date of this Agreement, the Registration
            Statement conforms in all material respects, and the Prospectus and
            any further amendments or supplements to the Registration Statement
            or the Prospectus will, when they become effective or are filed with
            the Commission, as the case may be, conform in all material respects
            to the requirements of the Securities Act, the Rules and Regulations
            and the Trust Indenture Act and the rules and regulations
            thereunder, and do not and will not, as of the applicable Effective
            Date (as to the Registration Statement and any amendment thereto)
            and as of the applicable filing date and at the Delivery Date (as
            defined below) (as to the Prospectus and any amendment or supplement
            thereto) 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 (with respect to the
            Prospectus, in light of the circumstances under which they were
            made); provided that no representation or warranty is made as to
            information contained in or omitted from the Registration Statement
            or the Prospectus in reliance upon and in conformity with written
            information furnished to the Company through the Underwriters by or
            on behalf of any Underwriter specifically for inclusion therein. The
            Indenture and the Supplemental Indenture conform, in all material
            respects to the requirements of the Trust Indenture Act and the
            rules and regulations thereunder; provided, however, that no
            representation or warranty is made as to information contained in or
            omitted from that part of the Registration Statement which shall
            constitute the Statement of Eligibility and Qualification on Form
            T-1 under the Trust Indenture Act of the Trustee under the
            Indenture. The Prospectus delivered to the Underwriters for use in
            connection with this offering was identical to the electronically
            transmitted copies thereof filed with the Commission pursuant to
            EDGAR, except to the extent permitted by Regulation S-T.

                  (d) The documents incorporated or deemed to be incorporated by
            reference in the Registration Statement as of the applicable
            Effective Date, the Prospectus as of its date or any Preliminary
            Prospectus as of its date, complied in all material respects with
            the Exchange Act and the rules and regulations thereunder, and none
            of such documents, at such dates, 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 the
            light of the circumstances under which they were made, not
            misleading.

                  (e) No stop order suspending the effectiveness of the
            Registration Statement or any part thereof has been issued and no
            proceeding for that purpose has been instituted or, to the knowledge
            of either of the Transaction Entities, threatened by the Commission
            or by the state securities authority of any jurisdiction. No order
            preventing or suspending the use of any Preliminary Prospectus or
            the Prospectus has been issued and no proceeding for that purpose
            has been instituted or, to the knowledge of either of the
            Transaction Entities, after due inquiry of the Commission,
            threatened by the Commission or by the state securities authority of
            any jurisdiction.

                  (f) The Company has been duly formed and is validly existing
            as a real estate investment trust in good standing under the laws of
            the State of

                                       3

            Maryland, is duly qualified to do business and is in good standing
            in each jurisdiction in which its ownership or lease of property or
            the conduct of its business requires such qualification, and has all
            power and authority necessary to own or hold its properties, to
            conduct the business in which it is engaged and to enter into and
            perform its obligations under this Agreement. None of the
            subsidiaries of the Company (other than the Operating Partnership)
            is a "significant subsidiary," as such term is defined in Rule 405
            of the Rules and Regulations. Except as described in the Prospectus
            and other than the Property Affiliates (as defined herein) and the
            Operating Partnership, Development Corp. and SP Trust, the Company
            owns no direct or indirect equity interest in any entity, except for
            such interests as, in the aggregate, are not material to the
            condition, financial or otherwise, or the earnings, assets, business
            affairs or business prospects of the Company and its subsidiaries
            considered as a single enterprise.

                  (g) All of the issued shares of beneficial interest of the
            Company have been duly and validly authorized and issued, are fully
            paid and non-assessable and conform to the description thereof
            contained in the Prospectus. Except as disclosed in the Prospectus
            and with respect to the Trust's Amended and Restated Share Incentive
            Plan (the "Share Incentive Plan"), the Company's Employee Stock
            Purchase Plan and the Company's Dividend Reinvestment and Share
            Purchase Plan, no shares of beneficial interest of the Company are
            reserved for any purpose and except for the equity interests in the
            Operating Partnership ("Units") and options to purchase shares of
            beneficial interest issued pursuant to the Share Incentive Plan,
            there are no outstanding securities convertible into or exchangeable
            for any shares of beneficial interest of the Company, and no
            outstanding options, rights (preemptive or otherwise) or warrants to
            purchase or subscribe for shares of beneficial interest or any other
            securities of the Company.

                  (h) The Operating Partnership has been duly formed and is
            validly existing as a limited partnership in good standing under the
            laws of the Commonwealth of Pennsylvania, is duly qualified to do
            business and is in good standing as a foreign limited partnership in
            each jurisdiction in which its ownership or lease of property or the
            conduct of its business requires such qualification (each such
            jurisdiction as provided in Schedule III), and has all partnership
            power and authority necessary to own or hold its properties, to
            conduct the business in which it is engaged and to enter into and
            perform its obligations under this Agreement. The Company is the
            sole general partner of the Operating Partnership. The limited
            partnership agreement of the Operating Partnership, as amended (the
            "Operating Partnership Agreement") is in full force and effect, and
            the aggregate percentage interests of the Company and the limited
            partners in the Operating Partnership are as set forth in the
            Prospectus. The owner's equity of the Operating Partnership is as
            described in the Prospectus. All of the Units have been duly and
            validly authorized and issued, are fully paid and, to the extent
            that such interests are owned by the Company, are owned by the
            Company free and clear of all liens, encumbrances, equities or
            claims.

                                       4

                  (i) Liberty Property Development Corp. ("Development Corp.")
            has been duly organized and is validly existing as a corporation in
            good standing under the laws of the Commonwealth of Pennsylvania, is
            duly qualified to do business and is in good standing in each
            jurisdiction in which its ownership or lease of property or the
            conduct of its business requires such qualification, and has all
            corporate power and authority necessary to own or hold its
            properties and to conduct the business in which it is engaged. All
            of the issued and outstanding capital stock of Development Corp. has
            been duly authorized and validly issued and is fully paid and
            non-assessable, has been offered and sold in compliance with all
            applicable laws (including, without limitation, federal or state
            securities laws) and all of the capital stock of Development Corp.
            owned by the Operating Partnership, as described in the Prospectus,
            is owned free and clear of any security interest, mortgage, pledge,
            lien, encumbrance, claim, restriction or equities. No shares of
            capital stock of Development Corp. are reserved for any purpose, and
            there are no outstanding securities convertible into or exchangeable
            for any capital stock of Development Corp., and no outstanding
            options, rights (preemptive or otherwise) or warrants to purchase or
            to subscribe for shares of such capital stock or any other
            securities of Development Corp.

                  (j) Liberty Property Development Corp-II ("Development-II")
            has been duly organized and is validly existing as a corporation in
            good standing under the laws of the Commonwealth of Pennsylvania, is
            duly qualified to do business and is in good standing in each
            jurisdiction in which its ownership or lease of property or the
            conduct of its business requires such qualification, and has all
            corporate power and authority necessary to own or hold its
            properties and to conduct the business in which it is engaged. All
            of the issued and outstanding capital stock of Development-II has
            been duly authorized and validly issued and is fully paid and
            non-assessable, has been offered and sold in compliance with all
            applicable laws (including, without limitation, federal or state
            securities laws) and all of the capital stock of Development-II
            owned by the Operating Partnership, as described in the Prospectus,
            is owned free and clear of any security interest, mortgage, pledge,
            lien, encumbrance, claim, restriction or equities. No shares of
            capital stock of Development-II are reserved for any purpose, and
            there are no outstanding securities convertible into or exchangeable
            for any capital stock of Development-II, and no outstanding options,
            rights (preemptive or otherwise) or warrants to purchase or to
            subscribe for shares of such capital stock or any other securities
            of Development-II.

                  (k) Liberty Property Special Trust ("SP Trust") has been duly
            organized and is validly existing as a business trust in good
            standing under the laws of the Commonwealth of Pennsylvania, is duly
            qualified to do business and is in good standing as a foreign
            corporation in each jurisdiction in which its ownership or lease of
            property or the conduct of its business requires such qualification,
            and has all corporate power and authority necessary to own or hold
            its properties and to conduct the business in which it is engaged.
            All of the issued and outstanding equity interests of SP Trust have
            been duly authorized and validly issued and are fully paid and
            non-assessable, has been offered and sold in

                                       5

            compliance with all applicable laws (including, without limitation,
            federal or state securities laws) and all of the equity interests of
            SP Trust are owned by the Company free and clear of any security
            interest, mortgage, pledge, lien, encumbrance, claim, restriction or
            equities. No shares of equity interests of SP Trust are reserved for
            any purpose, and there are no outstanding securities convertible
            into or exchangeable for any equity interests of SP Trust and no
            outstanding options, rights (preemptive or otherwise) or warrants to
            purchase or to subscribe for shares of such equity interests or any
            other securities of SP Trust

                  (l) Each of those certain partnerships, limited liability
            companies or other entities holding title to one or more of the
            Properties (the "Property Affiliates") are the only entities other
            than the Operating Partnership, SP Trust, Liberty Property
            Philadelphia Corp., a Pennsylvania corporation, Liberty Property
            Philadelphia Trust, a Pennsylvania trust, Liberty Property
            Philadelphia Corp-IV East, a Pennsylvania corporation, Liberty
            Property Philadelphia Corp-IV West, a Pennsylvania corporation, LP
            Malvern LLC, a Pennsylvania limited liability company, and Liberty
            UK Development Corp., a Pennsylvania corporation, through which the
            Company and the Operating Partnership own interests in the
            Properties. Each of the Property Affiliates has been duly organized
            and is validly existing as a limited partnership, limited liability
            company or other entity, is duly qualified to do business and is in
            good standing under the laws of the jurisdiction in which it was
            organized, is duly qualified to do business and is in good standing
            as a foreign entity in each jurisdiction in which its ownership or
            lease of property or the conduct of its business requires such
            qualification, and has all power and authority necessary to own or
            hold its properties and to conduct the business in which it is
            engaged. Except as set forth in the Prospectus, all of the ownership
            interests of each Property Affiliate have been duly and validly
            authorized and issued, are fully paid and non-assessable and all of
            the ownership interests owned directly or indirectly by the Company
            and the Operating Partnership, as described in the Prospectus, are
            owned free and clear of any security interest, mortgage, pledge,
            lien, encumbrance, claim, restriction or equities.

                  (m) The Notes have been duly and validly authorized and, when
            duly executed, authenticated, issued and delivered against payment
            therefor as provided herein and in the Indenture, will be duly and
            validly issued and outstanding, and shall constitute valid and
            binding obligations on the part of the Operating Partnership,
            entitled to the benefits of the Indenture, and enforceable against
            the Operating Partnership in accordance with their terms. Upon
            payment of the purchase price and delivery of the Notes in
            accordance herewith, each of the Underwriters will receive good,
            valid and marketable title to the Notes, free and clear of all
            security interests, mortgages, pledges, liens, encumbrances, claims,
            restrictions and equities.

                  (n) The Indenture has been duly and validly authorized,
            executed and delivered by the Operating Partnership and, assuming
            due authorization, execution and delivery by the Trustee,
            constitutes a valid and binding agreement of the Operating
            Partnership, enforceable against the Operating Partnership in

                                       6

            accordance with its terms; the Supplemental Indenture has been duly
            and validly authorized, executed and delivered by the Operating
            Partnership and, (assuming due execution and delivery by the
            Trustee), constitutes a valid and binding agreement of the Operating
            Partnership, enforceable against the Operating Partnership in
            accordance with its terms; the Notes, the Indenture and the
            Supplemental Indenture conform in all material respects to the
            descriptions thereof contained in the Prospectus.

                  (o) (A)This Agreement has been duly and validly authorized,
            executed and delivered by each of the Transaction Entities, and
            assuming due authorization, execution and delivery by the
            Underwriters, is a valid and binding agreement of each of the
            Transaction Entities, enforceable against the Transaction Entities
            in accordance with its terms; and (B) the Operating Partnership
            Agreement and the partnership agreement of each Property Affiliate
            have been duly and validly authorized, executed and delivered by the
            parties thereto and are valid and binding agreements of the parties
            thereto, enforceable against such parties in accordance with their
            terms.

                  (p) The execution, delivery and performance of this Agreement
            by each of the Transaction Entities, the execution, delivery and
            performance of the Indenture by the Operating Partnership and the
            consummation of the transactions contemplated hereby and thereby
            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 either of the Transaction Entities
            is a party or by which either of the Transaction Entities is bound
            or to which any of the Properties or other assets of either of the
            Transaction Entities is subject, nor will such actions result in any
            violation of the provisions of the charter, by-laws, certificate of
            limited partnership or agreement of limited partnership of either of
            the Transaction Entities, or any statute or any order, rule or
            regulation of any court or governmental agency or body having
            jurisdiction over either of the Transaction Entities or any of their
            properties or assets; and except for the registration of the Notes
            under the Securities Act and the qualification of the Indenture
            under the Trust Indenture Act and such consents, approvals,
            authorizations, registrations or qualifications as may be required
            under the Exchange Act and applicable state securities laws in
            connection with the purchase and distribution of the Notes by the
            Underwriters, no consent, approval, authorization or order of, or
            filing or registration with, any such court or governmental agency
            or body is required for the execution, delivery and performance of
            this Agreement by the Transaction Entities or the Indenture by the
            Operating Partnership, the consummation of the transactions
            contemplated hereby and thereby, and the issuance and delivery of
            the Notes.

                  (q) No event has occurred and is continuing that, had the
            Notes been issued, would (whether or not with the giving of notice
            and/or the passage of time and/or the fulfillment of any other
            requirement) constitute an Event of Default (as defined in the
            Indenture) under the Indenture.

                                       7

                  (r) Other than as described in the Prospectus, as disclosed to
            representatives of the Underwriters and other than rights of certain
            persons who have contributed Properties to the Partnership in
            exchange for Units and persons whose securities are already
            registered under the Securities Act, and except with respect to
            certain persons who may acquire preferred shares of the Company in
            exchange for preferred units of partnership interest in the
            Operating Partnership, there are no contracts, agreements or
            understandings between the Transaction Entities and any person
            granting such person the right to require the Company to file a
            registration statement under the Securities Act with respect to any
            securities of either of the Transaction Entities owned or to be
            owned by such person or to require either of the Transaction
            Entities to include such securities in the securities registered
            pursuant to the Registration Statement or in any securities being
            registered pursuant to any other registration statement filed by the
            Transaction Entities under the Securities Act.

                  (s) Except as described or contemplated in the Prospectus or
            pursuant to the Share Incentive Plan, and except for the issuance of
            common shares in exchange for Units, neither Transaction Entity has
            sold or issued any securities during the six-month period preceding
            the date of the Prospectus, including any sales pursuant to Rule
            144A or Regulations D or S under, the Securities Act.

                  (t) Neither of the Transaction Entities nor any of the
            Properties has sustained, since the date of the latest audited
            financial statements included in the Prospectus, any material loss
            or interference with its business 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,
            other than as set forth or contemplated in the Prospectus; and,
            since such date, there has not been any material change in the
            capital stock or long-term debt of either of the Transaction
            Entities or any material adverse change, or any development
            involving a prospective material adverse change, in or affecting the
            Properties or the general affairs, management, financial position,
            shareholders' equity or results of operations of either of the
            Transaction Entities, other than as set forth or contemplated in the
            Prospectus.

                  (u) The financial statements (including the related notes and
            supporting schedules thereto) filed as part of, or incorporated by
            reference in, the Registration Statement and the Prospectus present
            fairly the financial condition and results of operations of the
            entities purported to be shown thereby, at the dates and for the
            periods indicated, and have been prepared in conformity with
            generally accepted accounting principles applied on a consistent
            basis throughout the periods involved. The Company's ratios of
            earnings to fixed charges (actual and, if any, pro forma) included
            in the Prospectus under the captions "Certain Ratios" and in Exhibit
            12.1 to the Registration Statement have been calculated in
            compliance with Item 503(d) of Regulation S-K of the Commission. Pro
            forma financial information included in or incorporated by reference
            in the Registration Statement and the Prospectus has been prepared
            in accordance with the applicable requirements of the Securities
            Act, the Rules and Regulations and AICPA

                                       8

            guidelines with respect to pro forma financial information and
            includes all adjustments necessary to present fairly the pro forma
            financial position of the respective entity or entities presented
            therein at the respective dates indicated and the results of
            operations for the respective periods specified.

                  (v) Ernst & Young LLP, who have certified certain financial
            statements of the Operating Partnership, whose reports appear in the
            Prospectus or are incorporated by reference therein and who have
            delivered the initial letter referred to in Section 7(f) hereof, are
            independent public accountants as required by the Securities Act and
            the Rules and Regulations.

                  (w) (A) The Operating Partnership and the Property Affiliates
            have good and marketable title to each of the Properties, free and
            clear of all liens, encumbrances, claims, security interests and
            defects, other than those referred to in the Prospectus, those
            relating to certain intra-company debt with respect to Development
            and Development-II or those which are not material in amount or
            those which would not have a material adverse effect on the
            business, operations, use or value of any of the Properties; (B) all
            liens, charges, encumbrances, claims or restrictions on or affecting
            any of the Properties and the assets of any Transaction Entity which
            are required to be disclosed in the Prospectus are disclosed
            therein; (C) except as otherwise described in the Prospectus,
            neither Transaction Entity and, to the knowledge of the Transaction
            Entities, no tenant of any of the Properties is in default under (i)
            any space leases (as lessor or lessee, as the case may be) relating
            to the Properties, or (ii) any of the mortgages or other security
            documents or other agreements encumbering or otherwise recorded
            against the Properties, in each case which default would have a
            material adverse effect on the applicable Property, and neither
            Transaction Entity knows of any event which, but for the passage of
            time or the giving of notice, or both, would constitute such a
            default under any of such documents or agreements; (D) each of the
            Properties complies with all applicable codes, laws and regulations
            (including, without limitation, building and zoning codes, laws and
            regulations and laws relating to access to the Properties), except
            for such failures to comply that would not have a material adverse
            effect on the business operations, use or value of such Property;
            and (E) neither Transaction Entity has knowledge of any pending or
            threatened condemnation proceedings, zoning change or other
            proceeding or action that will in any material manner adversely
            affect the size of, use of, improvements on, construction on or
            access to the Properties.

                  (x) The mortgages and deeds of trust which encumber the
            Properties are not convertible into equity securities of the entity
            owning such Property and said mortgages and deeds of trust are not
            cross-defaulted or cross-collateralized with any property other than
            other Properties.

                  (y) The Operating Partnership and the Property Affiliates have
            obtained title insurance on the fee or leasehold interests in each
            of the Properties, in an amount at least equal to the greater of (A)
            the mortgage indebtedness of

                                       9

            each such Property or (B) the purchase price (exclusive of
            improvements) of each such Property.

                  (z) Except as disclosed in the Prospectus and except such as
            in each case would not have a material adverse effect on any
            Property, Property Affiliate, or Transaction Entity or any of their
            subsidiaries, taken together as a whole; (A) to the knowledge of the
            Transaction Entities, after due inquiry, (i) the operations of the
            Company, the Operating Partnership, Development Corp., Development
            II and SP Trust, and (ii) the Properties are in compliance with all
            Environmental Laws (as defined below) and all requirements of
            applicable permits, licenses, approvals and other authorizations
            issued pursuant to Environmental Laws; (B) to the knowledge of the
            Transaction Entities, after due inquiry, none of the Transaction
            Entities, the Property Affiliates or any Property has caused or
            suffered to occur any Release (as defined below) of any Hazardous
            Substance (as defined below) into the Environment (as defined below)
            on, in, under or from any Property, and no condition exists on, in,
            under or adjacent to any Property that could result in the
            incurrence of liabilities under, or any violations of, any
            Environmental Law or give rise to the imposition of any Lien (as
            defined below), under any Environmental Law; (C) none of the
            Transaction Entities or Property Affiliates has received any written
            notice of a claim under or pursuant to any Environmental Law or
            under common law pertaining to Hazardous Substances on, in, under or
            originating from any Property; (D) neither of the Transaction
            Entities has actual knowledge of, or received any written notice
            from any Governmental Authority (as defined below) claiming, any
            violation of any Environmental Law or a determination to undertake
            and/or request the investigation, remediation, clean-up or removal
            of any Hazardous Substance released into the Environment on, in,
            under or from any Property; and (E) no Property is included or, to
            the knowledge of the Transaction Entities, after due inquiry,
            proposed for inclusion on the National Priorities List issued
            pursuant to CERCLA (as defined below) by the United States
            Environmental Protection Agency (the "EPA") or on the Comprehensive
            Environmental Response, Compensation, and Liability Information
            System database maintained by the EPA, and neither of the
            Transaction Entities has actual knowledge that any Property has
            otherwise been identified in a published writing by the EPA as a
            potential CERCLA removal, remedial or response site or, to the
            knowledge of the Transaction Entities, is included on any similar
            list of potentially contaminated sites pursuant to any other
            Environmental Law.

            As used herein, "Hazardous Substance" shall include any hazardous
            substance, hazardous waste, toxic substance, pollutant or hazardous
            material, including, without limitation, oil, petroleum or any
            petroleum-derived substance or waste, asbestos or
            asbestos-containing materials, PCBs, pesticides, explosives,
            radioactive materials, dioxins, urea formaldehyde insulation or any
            constituent of any such substance, pollutant or waste which is
            subject to regulation under any Environmental Law (including,
            without limitation, materials listed in the United States Department
            of Transportation Optional Hazardous Material Table, 49 C.F.R.
            Section 172.101, or in the EPA's List of Hazardous Substances and
            Reportable

                                       10

            Quantities, 40 C.F.R. Part 302); "Environment" shall mean any
            surface water, drinking water, ground water, land surface,
            subsurface strata, river sediment, buildings, structures, and
            ambient, workplace and indoor and outdoor air; "Environmental Law"
            shall mean the Comprehensive Environmental Response, Compensation
            and Liability Act of 1980, as amended (42 U.S.C. Section 9601 et
            seq.) ("CERCLA"), the Resource Conservation and Recovery Act of
            1976, as amended (42 U.S.C. Section 6901, et seq.), the Clean Air
            Act, as amended (42 U.S.C. Section 7401, et seq.), the Clean Water
            Act, as amended (33 U.S.C. Section 1251, et seq.), the Toxic
            Substances Control Act, as amended (15 U.S.C. Section 2601, et
            seq.), the Occupational Safety and Health Act of 1970, as amended
            (29 U.S.C. Section 651, et seq.), the Hazardous Materials
            Transportation Act, as amended (49 U.S.C. Section 1801, et seq.),
            and all other federal, state and local laws, ordinances,
            regulations, rules and orders relating to the protection of the
            Environment or of human health from environmental effects;
            "Governmental Authority" shall mean any federal, state or local
            governmental office, agency or authority having the duty or
            authority to promulgate, implement or enforce any Environmental Law;
            "Lien" shall mean, with respect to any Property, any lien,
            encumbrance, penalty, fine, charge, assessment, judgment or other
            liability in, on or affecting such Property; and "Release" shall
            mean any spilling, leaking, pumping, pouring, emitting, emptying,
            discharging, injecting, escaping, leaching, dumping, emanating or
            disposing of any Hazardous Substance into the Environment,
            including, without limitation, the abandonment or discard of
            barrels, containers, tanks (including, without limitation,
            underground storage tanks) or other receptacles containing or
            previously containing any Hazardous Substance.

                  (aa) Each Transaction Entity and each of their subsidiaries
            carries, or is covered by, insurance in such amounts and covering
            such risks as is adequate for the conduct of its business and as is
            customary for companies engaged in similar businesses in similar
            industries; and each Property carries, or is covered by, insurance
            covering the value of such Property.

                  (bb) Each Transaction Entity owns or possesses adequate rights
            to use all material patents, patent applications, trademarks,
            service marks, trade names, trademark registrations, service mark
            registrations, copyrights and licenses necessary for the conduct of
            its business and has no reason to believe that the conduct of its
            business will conflict with, and has not received any notice of any
            claim of conflict with, any such rights of others.

                  (cc) Except as described in the Prospectus, there are no legal
            or governmental proceedings pending to which either Transaction
            Entity or their subsidiaries is a party or of which any property or
            assets of either Transaction Entity or their subsidiaries is the
            subject which, if determined adversely to such Transaction Entity or
            subsidiary, could reasonably be expected to have a material adverse
            effect on the consolidated financial position, shareholders' equity,
            results of operations, business or prospects of the Company; and to
            the knowledge of the Transaction Entities, no such proceedings are
            threatened or contemplated by governmental authorities or threatened
            by others.

                                       11

                  (dd) There are no contracts or other documents which are
            required to be described in the Prospectus or filed as exhibits to
            the Registration Statement by the Securities Act or by the Rules and
            Regulations which have not been described in the Prospectus or filed
            as exhibits to the Registration Statement or incorporated therein by
            reference as permitted by the Rules and Regulations.

                  (ee) No relationship, direct or indirect, exists between or
            among either of the Transaction Entities on the one hand, and the
            trustees, officers, shareholders, customers or suppliers of the
            Transaction Entities on the other hand, that is required to be
            described in the Prospectus that is not so described.

                  (ff) No labor disturbance by the employees of either
            Transaction Entity exists or, to the knowledge of the Transaction
            Entities, is imminent which might be expected to have a material
            adverse effect on the consolidated financial position, shareholders'
            equity, results of operations, business or prospects of such
            Transaction Entity.

                  (gg) Each "pension plan" for which either Transaction Entity
            would have any liability that is intended to be qualified under
            section 401(a) of the Code is (i) so qualified in all material
            respects and nothing has occurred, whether by action or by failure
            to act, which would cause the loss of such qualification and (ii) in
            compliance in all material respects with all presently applicable
            provisions of the Employee Retirement Income Security Act of 1974,
            as amended, including the regulations and published interpretations
            thereunder ("ERISA"); to the knowledge of the Transaction Entities,
            after due inquiry, no "reportable event" (as defined in ERISA) has
            occurred with respect to any "pension plan" (as defined in ERISA)
            for which either Transaction Entity would have any liability;
            neither Transaction Entity has incurred or expects to incur
            liability under (i) Title IV of ERISA with respect to termination
            of, or withdrawal from, any "pension plan" or (ii) sections 412 or
            4971 of the Internal Revenue Code of 1986, as amended, including the
            regulations and published interpretations thereunder (the "Code");
            and.

                  (hh) Each Transaction Entity and their subsidiaries has filed
            all federal, state and local income and franchise tax returns
            required to be filed through the date hereof and has paid all taxes
            due thereon, and no material tax deficiency has been determined
            adversely to either Transaction Entity or their subsidiaries which
            has had (nor does either Transaction Entity have any knowledge of
            any tax deficiency which, if determined adversely to it might have)
            a material adverse effect on the financial position, shareholders'
            equity, results of operations, business or prospects of such
            Transaction Entity or subsidiary.

                  (ii) At all times since June 16, 1994, the Company, the
            Operating Partnership, Development Corp., Development II and SP
            Trust have been, and upon the sale of the Notes will continue to be,
            organized and operated in conformity with the requirements for
            qualification and taxation of the Company as a real estate
            investment trust under the Code and the proposed method of

                                       12

            operation of the Company, the Operating Partnership, Development
            Corp., Development II and SP Trust will enable the Company to
            continue to meet the requirements for qualification and taxation as
            a real estate investment trust under the Code.

                  (jj) Since the date as of which information is given in the
            Prospectus through the date hereof, and except as may otherwise be
            disclosed or contemplated in the Prospectus, neither Transaction
            Entity has (i) issued or granted any securities, (ii) incurred any
            liability or obligation, direct or contingent, other than
            liabilities and obligations which were incurred in the ordinary
            course of business, (iii) entered into any transaction not in the
            ordinary course of business nor (iv) declared or paid any dividend
            on its capital stock (other than regular quarterly dividends).

                  (kk) Each Transaction Entity and each of their subsidiaries
            (i) makes and keeps accurate books and records and (ii) maintains
            internal accounting controls which provide reasonable assurance that
            (A) transactions are executed in accordance with management's
            authorization, (B) transactions are recorded as necessary to permit
            preparation of its financial statements and to maintain
            accountability for its assets, (C) access to its assets is permitted
            only in accordance with management's authorization and (D) the
            reported accountability for its assets is compared with existing
            assets at reasonable intervals.

                  (ll) No Transaction Entity or any of their subsidiaries (i) is
            in violation of its charter, by-laws, certificate of limited
            partnership, agreement of limited partnership or other similar
            organizational document, (ii) is in default in any material respect,
            and no event has occurred which, with notice or lapse of time or
            both, would constitute such a default, in the due performance or
            observance of any term, covenant or condition contained in any
            material indenture, mortgage, deed of trust, loan agreement or other
            agreement or instrument to which it is a party or by which it is
            bound or to which any of the Properties or any of its other
            properties or assets is subject or (iii) is in violation in any
            material respect of any law, ordinance, governmental rule,
            regulation or court decree to which it or the Properties or any of
            its other properties or assets may be subject or has failed to
            obtain any material license, permit, certificate, franchise or other
            governmental authorization or permit necessary to the ownership of
            the Properties or any of its other properties or assets or to the
            conduct of its business.

                  (mm) Neither Transaction Entity, nor any trustee, officer,
            agent, employee or other person associated with or acting on behalf
            of either Transaction Entity, has used any corporate funds for any
            unlawful contribution, gift, entertainment or other unlawful expense
            relating to political activity; made any direct or indirect unlawful
            payment to any foreign or domestic government official or employee
            from corporate funds; violated or is in violation of any provision
            of the Foreign Corrupt Practices Act of 1977; or made any bribe,
            rebate, payoff, influence payment, kickback or other unlawful
            payment.

                                       13

                  (nn) Neither Transaction Entity nor any of their subsidiaries
            is an "investment company" within the meaning of such term under the
            Investment Company Act of 1940 and the rules and regulations of the
            Commission thereunder.

                  (oo) Other than this Agreement and as set forth in the
            Prospectus under the heading "Underwriting," there are no contracts,
            agreements or understandings between either Transaction Entity and
            any person that would give rise to a valid claim against either
            Transaction Entity or any Underwriter for a brokerage commission,
            finder's fee or other like payment with respect to the consummation
            of the transactions contemplated by this Agreement.

                  (pp) Each Transaction Entity has complied with all applicable
            provisions of Florida Statutes Section 517.075, relating to issuers
            doing business with Cuba.

            2. Purchase of the Notes by the Underwriters. On the basis of the
representations and warranties contained in, and subject to the terms and
conditions of, this Agreement, the Operating Partnership agrees to sell to the
several Underwriters, and each of the Underwriters, severally and not jointly,
agrees to purchase from the Operating Partnership, the respective principal
amount of Notes set forth opposite that Underwriter's name in Schedule I hereto
at the purchase price set forth in Schedule II hereto plus accrued interest, if
any, from the date specified in Schedule II hereto to the date of payment and
delivery.

            The obligation of the Underwriters to purchase and pay for the Notes
may be satisfied by CSFB by delivering to the Operating Partnership in exchange
for the Notes (x) $75,000,000 aggregate principal amount of the Operating
Partnership's 6.375% Putable/Callable Medium-Term Notes due January 15, 2013,
Putable/Callable January 15, 2003 (the "Exchange Notes") (or such lesser amount
of the Exchange Notes as CSFB actually holds or as is equal to the purchase
price of the Notes as set forth in Schedule II), in accordance with arrangements
established between the Operating Partnership and the Underwriters, and (y) a
cash payment in accordance with Section 4 equal to the excess, if any, of the
purchase price of the Notes as set forth in Schedule II hereto over $82,752,414.
The Exchange Notes will be delivered on the Closing Date through the facilities
of The Depository Trust Company to Bank One, National Association, as Trustee,
for the account of the Operating Partnership. Delivery of the Exchange Notes
will be deemed to have occurred when the Operating Partnership receives notice
from the Trustee that the Trustee's (or its nominee's) account with The
Depository Trust Company has been credited with the Exchange Notes. Each
Underwriter has authorized CSFB (for such Underwriter's account) to make payment
of the purchase price for the Notes as set forth in Schedule II in accordance
with the procedures set forth in this paragraph.

            3. Offering of Notes by the Underwriters. The several Underwriters
propose to offer the Notes for sale upon the terms and conditions set forth in
the Prospectus.

            4. Delivery of and Payment for the Notes. Delivery of and payment
for the Notes shall be made at the office of Clifford Chance US LLP, 200 Park
Avenue, New York, New York 10166, at 10:00 A.M., New York City time, on the
third full business day following the

                                       14

date of this Agreement or on the fourth full business day if this Agreement is
executed after the daily closing time of the New York Stock Exchange (unless
postponed in accordance with the provisions of Section 9 hereof), or at such
other date or place as shall be determined by agreement between the Underwriters
and the Operating Partnership. This date and time are sometimes referred to as
the "Delivery Date." On the Delivery Date, the Operating Partnership shall
deliver or cause to be delivered the Notes to the Underwriters for the account
of each Underwriter against payment to or upon the order of the Operating
Partnership of the purchase price by delivery of the Exchange Notes as described
in Section 2 and, with respect to any additional purchase price as provided in
Section 2, by certified or official bank check or checks payable in same day
funds or, at the discretion of the Operating Partnership, by wire transfer in
same day funds to an account at a bank acceptable to the Underwriters. Time
shall be of the essence, and delivery at the time and place specified pursuant
to this Agreement is a further condition of the obligation of each Underwriter
hereunder. Upon delivery, the Notes shall be registered in such names and in
such denominations as the Underwriters shall request in writing not less than
two full business days prior to the Delivery Date. For the purpose of expediting
the checking and packaging of the Notes, the Operating Partnership shall make
the Notes available for inspection by the Underwriters in New York, New York,
not later than 2:00 P.M., New York City time, on the business day prior to the
Delivery Date.

            5. Further Agreements of the Transaction Entities. Each of the
Transaction Entities jointly and severally agrees:

                  (a) To prepare the Prospectus in a form approved by the
            Underwriters and to file such Prospectus pursuant to Rule 424(b)
            under the Securities Act not later than the Commission's close of
            business on the second business day following the execution and
            delivery of this Agreement or, if applicable, such earlier time as
            may be required by Rule 430A(a)(3) under the Securities Act; to make
            no further amendment or any supplement to the Registration Statement
            or to the Prospectus except in accordance with Section 5(e) hereof
            and except for the Form 8-K; to advise the Underwriters, promptly
            after it receives notice thereof, of the time when any amendment to
            the Registration Statement has been filed or becomes effective or
            any supplement to the Prospectus or any amended Prospectus has been
            filed and to furnish the Underwriters with copies thereof; to advise
            the Underwriters, promptly after it receives notice thereof, of the
            issuance by the Commission of any stop order or of any order
            preventing or suspending the use of any Preliminary Prospectus or
            the Prospectus, of the suspension of the qualification of the Notes
            for offering or sale in any jurisdiction, of the initiation or
            threatening of any proceeding for any such purpose, or of any
            request by the Commission for the amending or supplementing of the
            Registration Statement or the Prospectus or for additional
            information; and, in the event of the issuance of any stop order or
            of any order preventing or suspending the use of any Preliminary
            Prospectus or the Prospectus or suspending any such qualification,
            to use promptly its best efforts to obtain its withdrawal;

                  (b) To furnish promptly to the Underwriters and to counsel for
            the Underwriters such number of conformed copies as the Underwriters
            shall reasonably request of the Registration Statement as originally
            filed with the Commission, and each amendment thereto filed with the

                                       15

            Commission, including all consents and exhibits filed therewith or
            incorporated by reference therein and all documents incorporated by
            reference therein;

                  (c) To deliver promptly to the Underwriters such number of the
            following documents as the Underwriters shall reasonably request:
            (i) conformed copies of the Registration Statement as originally
            filed with the Commission and each amendment thereto (in each case
            excluding exhibits other than this Agreement) and (ii) each
            Preliminary Prospectus, the Prospectus and any amended or
            supplemented Prospectus; and, if the delivery of a prospectus is
            required at any time after the applicable Effective Time in
            connection with the offering or sale of the Notes or any other
            securities relating thereto and if at such time any events shall
            have occurred as a result of which the Prospectus as then amended or
            supplemented would include an untrue statement of a material fact or
            omit to state any material fact necessary in order to make the
            statements therein, in the light of the circumstances under which
            they were made when such Prospectus is delivered, not misleading,
            or, if for any other reason it shall be necessary to amend or
            supplement the Prospectus in order to comply with the Securities Act
            or the Exchange Act, to notify the Underwriters and, upon their
            request, to file such document and to prepare and furnish without
            charge to each Underwriter and to any dealer in securities as many
            copies as the Underwriters may from time to time reasonably request
            of an amended or supplemented Prospectus which will correct such
            statement or omission or effect such compliance. The aforementioned
            documents furnished to the Underwriters will be identical to the
            electronically transmitted copies thereof filed with the Commission
            pursuant to EDGAR, except to the extent permitted by Regulation S-T.

                  (d) To file promptly with the Commission any amendment to the
            Registration Statement or the Prospectus or any supplement to the
            Prospectus that may, in the judgment of the Company or counsel for
            the Underwriters, be required by the Securities Act or requested by
            the Commission;

                  (e) Prior to filing with the Commission any amendment to the
            Registration Statement or supplement to the Prospectus or any
            Prospectus pursuant to Rule 424 of the Rules and Regulations, to
            furnish a copy thereof to the Underwriters and counsel for the
            Underwriters within a reasonable period of time prior to the filing
            thereof, and that filing thereof shall not occur if the Underwriters
            shall have objected in good faith thereto;

                  (f) The Operating Partnership will make generally available to
            its security holders as soon as practicable but no later than 60
            days after the close of the period covered thereby an earnings
            statement (in form complying with the provisions of Section 11(a) of
            the Securities Act and Rule 158 of the Rules and Regulations), which
            need not be certified by independent certified public accountants
            unless required by the Securities Act or the Rules and Regulations,

                                       16

            covering a twelve-month period commencing after the "effective date"
            (as defined in said Rule 158) of the Registration Statement;

                  (g) The Company and the Operating Partnership will file any
            reports required to be furnished to the Commission pursuant to the
            Exchange Act or any rule or regulation of the Commission thereunder
            on EDGAR to the extent required to be filed via EDGAR;

                  (h) Promptly from time to time to take such action as the
            Underwriters may reasonably request to qualify the Notes for
            offering and sale under the securities or real estate syndication of
            such jurisdictions as the Underwriters may request and to comply
            with such laws so as to permit the continuance of sales and dealings
            therein in such jurisdictions for as long as may be necessary to
            complete the distribution of the Notes, except that the Operating
            Partnership shall not be required in connection therewith to qualify
            as a foreign corporation or to execute a consent to service of
            process in any jurisdiction;

                  (i) Until the Delivery Date, neither the Operating Partnership
            nor the Company will, directly or indirectly, offer for sale,
            contract to sell, sell or otherwise dispose of, or register for sale
            under the Securities Act, any debt securities, or sell or grant
            options, rights or warrants with respect to any debt securities,
            without the prior written consent of the Underwriters;

                  (j) To apply the net proceeds from the sale of the Notes in
            accordance with the description set forth in the Prospectus under
            the caption "Use of Proceeds";

                  (k) To take such steps as shall be necessary to ensure that
            none of the Company, the Operating Partnership or any of their
            subsidiaries shall become an "investment company" within the meaning
            of such term under the Investment Company Act of 1940 and the rules
            and regulations of the Commission thereunder;

                  (l) Except as stated in this Agreement and in the Preliminary
            Prospectus, if any, and Prospectus, neither Transaction Entity has
            taken, nor will take, directly or indirectly, any action designed to
            or that might reasonably be expected to cause or result in
            stabilization or manipulation of the price of the Notes to
            facilitate the sale or resale of the Notes;

                  (m) The Company will use its best efforts to continue to meet
            the requirements to qualify as a "real estate investment trust"
            under the Code; and

                  (n) If this Agreement shall be terminated by the Underwriters
            because of any failure or refusal on the part of the Transaction
            Entities to comply with the terms or fulfill any of the conditions
            of this Agreement, the Transaction Entities jointly and severally
            agree to reimburse the Underwriters for all reasonable out-of-pocket
            expenses (including fees and expenses of counsel for the
            Underwriters) incurred by the Underwriters in connection herewith.

                                       17

            6. Expenses. The Transaction Entities jointly and severally agree to
pay (a) the costs incident to the authorization, issuance, sale and delivery of
the Notes and any taxes payable in connection therewith; (b) the costs incident
to the preparation, printing and filing under the Securities Act of the
Registration Statement and any amendments and exhibits thereto; (c) the costs of
distributing the Registration Statement as originally filed and each amendment
thereto and any post-effective amendments thereof (including, in each case,
exhibits), any Preliminary Prospectus, the Prospectus and any amendment or
supplement to the Prospectus, all as provided in this Agreement; (d) the costs
of producing and distributing this Agreement and any other related documents in
connection with the offering, purchase, sale and delivery of the Notes; (e) the
filing fees incident to securing any required review by the National Association
of Securities Dealers, Inc. of the terms of sale of the Notes; (f) any
applicable listing or other fees; (g) the fees and expenses of qualifying the
Notes under the securities laws of the several jurisdictions as provided in
Section 5(h) and of preparing, printing and distributing a Blue Sky Memorandum
(including related fees and expenses of counsel to the Underwriters); (h) the
fees paid to rating agencies in connection with the rating of the Notes; and (i)
all other costs and expenses incident to the performance of the obligations of
the Transaction Entities under this Agreement; provided that, except as provided
in this Section 6 and in Section 12, the Underwriters shall pay their own costs
and expenses, including the costs and expenses of their counsel, any transfer
taxes on the Notes which they may sell and the expenses of advertising any
offering of the Notes made by the Underwriters.

            7. Conditions of Underwriters' Obligations. The respective
obligations of the Underwriters hereunder are subject to the accuracy, when made
and on the Delivery Date, of the representations and warranties of the
Transaction Entities contained herein, to the performance by each Transaction
Entity of its obligations hereunder, and to each of the following additional
terms and conditions:

                  (a) If, at the time this Agreement is executed and delivered,
            it is necessary for the Registration Statement or a post-effective
            amendment thereto to be declared effective before the offering of
            the Notes may commence, the Registration Statement or such
            post-effective amendment shall have become effective not later than
            5:30 P.M., New York City time, on the date hereof, or at such later
            date and time as shall be consented to in writing by you, and all
            filings, if any, required to have been made by such time by Rules
            424 and 430A under the Rules and Regulations shall have been timely
            made; no stop order suspending the effectiveness of the Registration
            Statement shall have been issued and no proceeding for that purpose
            shall have been instituted or, to the knowledge of the Transaction
            Entities or any Underwriter, threatened by the Commission, and any
            request of the Commission for additional information (to be included
            in the Registration Statement or the Prospectus or otherwise) shall
            have been complied with to the satisfaction of the Underwriters.

                  (b) Subsequent to the effective date of this Agreement, there
            shall not have occurred (i) any change, or any development involving
            a prospective change, in or affecting the condition, financial or
            otherwise, business, properties, net worth, or results of operations
            of either Transaction Entity or any of their subsidiaries or any
            Property not contemplated by the Prospectus, which in the

                                       18

            reasonable opinion of the Underwriters, would materially adversely
            affect the market for the Notes, or (ii) any event or development
            relating to or involving either Transaction Entity, or any partner,
            officer, director or trustee of either Transaction Entity, which
            makes any statement of a material fact made in the Prospectus untrue
            or which, in the reasonable opinion of the Company and its counsel
            or the Underwriters and their counsel, requires the making of any
            addition to or change in the Prospectus in order to state a material
            fact required by the Securities Act or any other law to be stated
            therein or necessary in order to make the statements therein not
            misleading, if amending or supplementing the Prospectus to reflect
            such event or development would, in the reasonable opinion of the
            Underwriters or their counsel, materially adversely affect the
            market for the Notes.

                  (c) All corporate and partnership proceedings and other legal
            matters incident to the authorization, form and validity of this
            Agreement, the Indenture, the Notes, the Registration Statement and
            the Prospectus, and all other legal matters relating to this
            Agreement, the Indenture, the Notes, the Registration Statement and
            the Prospectus and the transactions contemplated hereby and thereby
            shall be reasonably satisfactory in all material respects to counsel
            for the Underwriters, and the Transaction Entities shall have
            furnished to such counsel all documents and information that they
            may reasonably request to enable them to pass upon such matters.

                  (d) (A) Morgan Lewis & Bockius LLP shall have furnished to the
            Underwriters its written opinion, as counsel to the Transaction
            Entities, addressed to the Underwriters and dated the Delivery Date,
            in form and substance reasonably satisfactory to the Underwriters,
            to the effect that:

                        (i) The Company is in good standing as a foreign trust
                  or corporation in those jurisdictions listed in such opinion.

                        (ii) The Operating Partnership is validly existing as a
                  limited partnership under the laws of the Commonwealth of
                  Pennsylvania, is duly qualified to do business as a foreign
                  limited partnership in Florida, Kansas, Maryland, Michigan,
                  Minnesota, New Jersey, North Carolina, South Carolina, Texas,
                  Virginia and Wisconsin, and has all partnership power and
                  authority necessary to own or hold its properties, to conduct
                  the business in which it is engaged as described in the
                  Registration Statement and the Prospectus, and to enter into
                  and perform its obligations under this Agreement. The Company
                  is the sole general partner of the Operating Partnership. To
                  the knowledge of such counsel, the Operating Partnership
                  Agreement is in full force and effect, and the aggregate
                  percentage interests of the Company and the limited partners
                  in the Operating Partnership are as set forth in the
                  Prospectus. All of the partnership interests of the Operating
                  Partnership have been duly and validly authorized and issued,
                  are fully paid and, to the knowledge of such counsel, to the
                  extent that such interests are owned by the Company, are

                                       19

                  owned by the Company free and clear of any adverse claims as
                  defined in Section 8-302 of the Uniform Commercial Code.

                        (iii) Development Corp. is duly incorporated and
                  subsisting under the laws of the Commonwealth of Pennsylvania,
                  is duly qualified to do business and is in good standing as a
                  foreign corporation in Florida, Maryland, Michigan, Minnesota,
                  New Jersey, North Carolina, Virginia and Wisconsin, and has
                  all corporate power and authority necessary to own or hold its
                  properties and to conduct the business in which it is engaged
                  as described in the Registration Statement and the Prospectus.

                        (iv) Development-II is duly incorporated and subsisting
                  under the laws of the Commonwealth of Pennsylvania, is duly
                  qualified to do business and is in good standing as a foreign
                  corporation in Florida and Texas, and has all corporate power
                  and authority necessary to own or hold its properties and to
                  conduct the business in which it is engaged as described in
                  the Registration Statement and the Prospectus.

                        (v) SP Trust is validly existing as a business trust and
                  subsisting under the laws of the Commonwealth of Pennsylvania
                  and has all trust power and authority necessary to own or hold
                  its properties and to conduct the business in which it is
                  engaged as described in the Registration Statement and the
                  Prospectus.

                        (vi) This Agreement has been duly and validly
                  authorized, executed and delivered by the Operating
                  Partnership, and has been duly and validly executed and
                  delivered by the Company.

                        (vii) Each of the Indenture and the Supplemental
                  Indenture has been duly authorized, executed and delivered by
                  the Operating Partnership and (assuming due execution and
                  delivery by the Trustee) constitutes a valid and binding
                  agreement on the part of the Operating Partnership,
                  enforceable against the Operating Partnership in accordance
                  with its terms; each of the Indenture and the Supplemental
                  Indenture conforms in all material respects to the
                  descriptions thereof contained in the Prospectus.

                        (viii) The Notes have been duly authorized, executed and
                  delivered by the Operating Partnership and, assuming due
                  authorization, execution and delivery of the Indenture and the
                  authentication of the Notes by the Trustee and payment for the
                  Notes by the Underwriters in accordance with the terms of the
                  Underwriting Agreement, will constitute valid and binding
                  obligations of the Operating Partnership in accordance with
                  their terms. The terms of the Notes conform in all material
                  respects to the description thereof in the Prospectus.

                                       20

                        (ix) To the knowledge of such counsel, the execution,
                  delivery and performance of this Agreement by each of the
                  Transaction Entities and the consummation of the transactions
                  contemplated hereby will not (i) 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 that is
                  filed as an exhibit to the Registration Statement or to any
                  document incorporated by reference in the Prospectus and as to
                  which either of the Transaction Entities or their subsidiaries
                  is a party or to which any of the Properties or other assets
                  of either of the Transaction Entities or their subsidiaries is
                  subject, or (ii) conflict with or result in any violation of
                  the provisions of any statute or any order, rule or regulation
                  of any court or governmental agency or body having
                  jurisdiction over either of the Transaction Entities or their
                  subsidiaries or any of their properties or assets, except with
                  respect to (ii), where such conflict or violation would not
                  have a material adverse effect on the Transaction Entities or
                  their subsidiaries taken as a whole; and except for the
                  registration of the Notes under the Securities Act and the
                  qualification of the Indenture under the Trust Indenture Act
                  and such consents, approvals, authorizations, registrations or
                  qualifications as may be required under the Exchange Act and
                  applicable state securities laws in connection with the
                  purchase and distribution of the Notes by the Underwriters, no
                  consent, approval, authorization or order of, or filing or
                  registration with, any such court or governmental agency or
                  body is required for the execution, delivery and performance
                  of this Agreement, the Indenture or the Supplemental Indenture
                  by the Transaction Entities and the consummation of the
                  transactions contemplated hereby and thereby, and the issuance
                  and delivery of the Notes.

                        (x) The execution, delivery and performance of this
                  Agreement by each of the Transaction Entities and the
                  consummation of the transactions contemplated hereby will not
                  conflict with or result in any violation of the provisions of
                  the charter, by-laws, certificate of limited partnership or
                  agreement of limited partnership of either of the Transaction
                  Entities or their subsidiaries.

                        (xi) Except as set forth in the Prospectus, to the
                  knowledge of such counsel, there are no preemptive or other
                  rights to subscribe for or to purchase, nor any restriction
                  upon the transfer of the Notes pursuant to the Operating
                  Partnership's certificate of limited partnership, its
                  agreement of limited partnership, as amended to the date
                  hereof, or any agreement or other instrument to which the
                  Operating Partnership is a party.

                        (xii) To the knowledge of such counsel, other than as
                  set forth in the Prospectus and other than in respect of (i)
                  certain persons who have contributed Properties to the
                  Partnership in exchange for Units, (ii) persons whose
                  securities are already registered under the Securities Act,
                  and (iii) persons who may acquire preferred shares of the
                  Company in

                                       21

                  exchange for preferred units of partnership interest in the
                  Operating Partnership, there are no contracts, agreements or
                  understandings between the Company and/or the Operating
                  Partnership, on the one hand, and any person, on the other
                  hand, granting such person the right to require the Company or
                  the Operating Partnership to file a registration statement
                  under the Securities Act with respect to any securities of the
                  Company or the Operating Partnership owned or to be owned by
                  such person or to require the Company or the Operating
                  Partnership to include such securities in the securities
                  registered pursuant to the Registration Statement or in any
                  securities being registered pursuant to any other registration
                  statement filed by the Company or the Operating Partnership
                  under the Securities Act.

                        (xiii) To the knowledge of such counsel, there are no
                  legal or governmental proceedings pending to which either
                  Transaction Entity or their subsidiaries is a party or of
                  which any property or assets of either Transaction Entity or
                  their subsidiaries is the subject, that are required to be
                  described in the Prospectus which have not been described as
                  required. To the knowledge of such counsel, no such
                  proceedings are threatened or contemplated by governmental
                  authorities or threatened by others.

                        (xiv) To the knowledge of such counsel, there are no
                  contracts or other documents which are required to be
                  described in the Prospectus or filed as exhibits to the
                  Registration Statement by the Securities Act or by the Rules
                  and Regulations which have not been described in the
                  Prospectus or filed as exhibits to the Registration Statement
                  or incorporated therein by reference as permitted by the Rules
                  and Regulations.

                        (xv) To the knowledge of such counsel, no consent,
                  approval, authorization or other order of, or registration or
                  filing with, any court, regulatory body, administrative agency
                  or other governmental body, agency, or official is required on
                  the part of the Company (except as have been obtained under
                  the Securities Act and the Exchange Act or such as may be
                  required under state securities or real estate syndication)
                  for the valid issuance and sale of the Notes to the
                  Underwriters as contemplated by this Agreement.

                        (xvi) Neither Transaction Entity nor any of their
                  subsidiaries is an "investment company" within the meaning of
                  such term under the Investment Company Act of 1940 and the
                  rules and regulations of the Commission thereunder.

                        (xvii) The documents incorporated or deemed to be
                  incorporated by reference in the Prospectus pursuant to Item
                  12 of Form S-3 under the Securities Act (other than the
                  financial statements and related schedules and financial
                  information and data included therein, as to which no

                                       22

                  opinion need be rendered), at the time they were filed with
                  the Commission, complied and will comply as to form in all
                  material respects with the requirements of the Exchange Act
                  and the rules and regulations thereunder.

                        (xviii) Based solely upon the oral advice of a member of
                  the staff of the Securities and Exchange Commission and, to
                  the knowledge of such counsel, no stop order suspending the
                  effectiveness of the Registration Statement has been issued
                  and, to the knowledge of such counsel, no proceeding for that
                  purpose is pending or threatened by the Commission. The
                  Registration Statement was declared effective under the
                  Securities Act and the Indenture was duly qualified under the
                  Trust Indenture Act as of the date and time specified in such
                  opinion.

                        (xix) The Prospectus was filed with the Commission
                  pursuant to the subparagraph of Rule 424(b) of the Rules and
                  Regulations specified in such opinion on the date specified
                  therein.

                        (xx) The Registration Statement and the Prospectus and
                  any further amendments or supplements thereto made by the
                  Company prior to the Delivery Date (other than the financial
                  statements and related schedules and other financial
                  information and data included therein, as to which such
                  counsel need express no opinion) comply as to form in all
                  material respects with the requirements of the Securities Act
                  and the Trust Indenture Act and the Indenture conforms in all
                  material respects to the requirements of the Trust Indenture
                  Act.

                        (xxi) The statements contained in the Prospectus under
                  the captions "Risk Factors," "Description of Debt Securities,"
                  "Description of Preferred Shares," "Description of Warrants,"
                  and "Description of Notes," insofar as those statements are
                  descriptions of contracts, agreements or other legal
                  documents, or they describe federal statutes, rules and
                  regulations, and except to the extent such statements are
                  statistics or calculations constitute a fair summary thereof.

                        (xxii) The statements contained in the prospectus
                  supplement to the Prospectus dated January 10, 2003 under the
                  caption "Certain Federal Income Tax Considerations," insofar
                  as those statements are descriptions of contracts, agreements
                  or other legal documents, or they describe federal statutes,
                  rules and regulations, and except to the extent such
                  statements are statistics or calculations are correct in all
                  material respects. Notwithstanding any references set forth in
                  the prospectus supplement in the discussion under the caption
                  "Certain Federal Income Tax Considerations" to the discussion
                  in the Prospectus under the caption "Federal Income Tax
                  Considerations with Respect to the Company and the Operating
                  Partnership", in rendering the opinion required by this
                  paragraph, Morgan, Lewis & Bockius LLP shall not be expressing
                  any

                                       23

                  opinion regarding the discussion or statements contained in
                  the Prospectus under the caption "Federal Income Tax
                  Considerations with Respect to the Company and the Operating
                  Partnership".

            In rendering such opinion, such counsel may (i) state that its
            opinion is limited to matters governed by the Federal laws of the
            United States of America, the laws of the Commonwealth of
            Pennsylvania and the laws of the State of Maryland; (ii) as to
            matters of Maryland law, state that its opinion is given solely in
            reliance upon the opinion of Saul Ewing LLP; and (iii) in giving the
            opinions referred to in subclause (vii) and (viii), state that such
            opinion with respect to the enforceability of such documents may be
            limited by bankruptcy, fraudulent conveyance, insolvency,
            reorganization, moratorium, and other laws relating to or affecting
            creditors' rights generally and by general equitable principles.
            Such counsel shall also have furnished to the Underwriters a written
            statement, addressed to the Underwriters and dated the Delivery
            Date, in form and substance satisfactory to the Underwriters, to the
            effect that (x) such counsel has acted as counsel to the Company in
            connection with the preparation of the Registration Statement and
            the Prospectus, and (y) based on the foregoing, no facts have come
            to the attention of such counsel which lead it to believe that the
            Registration Statement, as of the Effective Date, contained any
            untrue statement of a material fact or omitted to state a material
            fact required to be stated therein or necessary in order to make the
            statements therein not misleading, or that the Prospectus contains
            any untrue statement of a material fact or omits to state a material
            fact required to be stated therein or necessary in order to make the
            statements therein, in light of the circumstances under which they
            were made, not misleading. The foregoing opinion and statement may
            be qualified by a statement to the effect that such counsel does not
            assume any responsibility for the accuracy, completeness or fairness
            of the statements contained in the Registration Statement or the
            Prospectus except to the extent of the opinion contained in Section
            7(d)(A)(xxii), and may state that such counsel expresses no belief
            with respect to the financial statements and notes thereto and other
            financial information and data included or incorporated by reference
            in, or omitted from, the Registration Statement or the Prospectus or
            the Statement of Eligibility on Form T-1 of the Trustee.

                  (B) Saul Ewing LLP shall have furnished to the Underwriters
            its written opinion, as Maryland counsel to the Company, addressed
            to the Underwriters and dated the Delivery Date, in form and
            substance reasonably satisfactory to the Underwriters, to the effect
            that:

                        (i) The Company has been duly formed and is validly
                  existing as a real estate investment trust in good standing
                  under and by virtue of the laws of the State of Maryland, and
                  has all trust power and authority necessary to own or hold its
                  properties and to conduct the business in which it is engaged
                  as described in the Registration Statement and the Prospectus,
                  and to enter into and perform its obligations under this
                  Agreement.

                                       24

                        (ii) This Agreement has been duly and validly
                  authorized, executed and delivered by the Company, and
                  assuming due authorization, execution and delivery by the
                  Underwriters and the Operating Partnership, is a valid and
                  binding agreement of the Company except as limited by (a)
                  bankruptcy, insolvency, reorganization, moratorium, fraudulent
                  conveyance or other laws relating to or affecting the
                  enforcement of creditors' rights or (b) general equitable
                  principles.

                        (iii) To the knowledge of such counsel, the execution,
                  delivery and performance of this Agreement by the Company and
                  the consummation of the transactions contemplated hereby will
                  not conflict with or result in any violation of the provisions
                  of any statute or any order, rule or regulation of any court
                  or governmental agency or body of the State of Maryland that
                  has jurisdiction over the Company or any of its properties or
                  assets.

                        (iv) The execution, delivery and performance of this
                  Agreement by the Company and the consummation of the
                  transactions contemplated hereby will not conflict with or
                  result in any violation of the provisions of the Declaration
                  of Trust or by-laws of the Company.

                        (v) To the knowledge of such counsel, there are no legal
                  or governmental proceedings pending to which the Company is a
                  party or of which any property or assets of the Company is the
                  subject which are not disclosed in the Prospectus and which,
                  if determined adversely to the Company, might reasonably be
                  expected to have a material adverse effect on the consolidated
                  financial position, shareholders' equity, results of
                  operations, business or prospects of the Company; and to the
                  best knowledge of such counsel no such proceedings are
                  threatened or contemplated by governmental authorities or
                  threatened by others.

            Such counsel shall state that Clifford Chance US LLP, counsel for
            the Underwriters, may rely on its opinion.

                  (e) (i) Wolf, Block, Schorr and Solis-Cohen LLP shall have
            furnished to the Underwriters its written opinion, dated the
            Delivery Date, with respect to such tax matters, including without
            limitation the qualification of the Company as a real estate
            investment trust and the classification of the Operating Partnership
            as a partnership (and not as a corporation) for federal income tax
            purposes, as the Underwriters may reasonably require.

                        (ii) The statements contained in the Prospectus under
                  the caption "Federal Income Tax Considerations with Respect to
                  the Trust and Operating Partnership," insofar as those
                  statements are descriptions of contracts, agreements or other
                  legal documents, or they describe federal statutes, rules and
                  regulations, and except to the extent such statements are
                  statistics or calculations are correct in all material
                  respects. In rendering the opinion required by this paragraph,
                  Wolf, Block, Schorr and Solis-Cohen LLP shall not be
                  expressing any opinion regarding the discussion

                                       25

                  or statements contained in the prospectus supplement dated
                  January 10, 2003 to the Prospectus under the caption "Certain
                  Federal Income Tax Considerations."

                  (f) The Underwriters shall have received from Clifford Chance
            US LLP, counsel for the Underwriters, such opinion or opinions,
            dated the Delivery Date, with respect to the issuance and sale of
            the Notes, the Registration Statement, the Prospectus and other
            related matters as the Underwriters may reasonably require, and the
            Company shall have furnished to such counsel such documents as they
            reasonably request for the purpose of enabling them to pass upon
            such matters.

                  (g) At the time of execution of this Agreement, the
            Underwriters shall have received from Ernst & Young LLP a letter, in
            form and substance satisfactory to the Underwriters, addressed to
            the Underwriters and dated the date hereof (i) confirming that they
            are independent public accountants within the meaning of the
            Securities Act and are in compliance with the applicable
            requirements relating to the qualification of accountants under Rule
            2-01 of Regulation S-X of the Commission, and (ii) stating, as of
            the date hereof (or, with respect to matters involving changes or
            developments since the respective dates as of which specified
            financial information is given in, or incorporated by reference in,
            the Prospectus, as of a date not more than five days prior to the
            date hereof), the conclusions and findings of such firm with respect
            to the financial information and other matters ordinarily covered by
            accountants' "comfort letters" to underwriters in connection with
            registered public offerings.

                  (h) With respect to the letter of Ernst & Young LLP referred
            to in the preceding paragraph and delivered to the Underwriters
            concurrently with the execution of this Agreement (the "initial
            letter"), the Underwriters shall have received from Ernst & Young a
            letter (the "bring-down letter"), addressed to the Underwriters and
            dated the Delivery Date (i) confirming that they are independent
            public accountants within the meaning of the Securities Act and are
            in compliance with the applicable requirements relating to the
            qualification of accountants under Rule 2-01 of Regulation S-X of
            the Commission, (ii) stating, as of the date of the bring-down
            letter (or, with respect to matters involving changes or
            developments since the respective dates as of which specified
            financial information is given in the Prospectus, as of a date not
            more than five days prior to the date of the bring-down letter), the
            conclusions and findings of such firm with respect to the financial
            information and other matters covered by the initial letter and
            (iii) confirming in all material respects the conclusions and
            findings set forth in the initial letter.

                  (i) The Transaction Entities shall have furnished to the
            Underwriters a certificate, dated the Delivery Date, of the Chairman
            of the Board, Chief Executive Officer, President or a Vice President
            of the Company and the chief financial officer of the Company (in
            each case, for the Company and for the Company as general partner of
            the Operating Partnership) stating that:

                                       26

                        (i) The representations, warranties and agreements of
                  the Transaction Entities in Section 1 are true and correct as
                  of the Delivery Date; the Transaction Entities complied with
                  all of their agreements contained herein; and the conditions
                  set forth in Sections 7(a) and 7(i) have been fulfilled; and

                        (ii) They have carefully examined the Registration
                  Statement and the Prospectus and, in their opinion (A) as of
                  the Effective Date, the Registration Statement and Prospectus
                  did not include any untrue statement of a material fact and
                  did not omit to state a material fact required to be stated
                  therein or necessary to make the statements therein not
                  misleading (with respect to the Prospectus, in light of the
                  circumstances in which they were made), and (B) since the
                  Effective Date no event has occurred which should have been
                  set forth in a supplement or amendment to the Registration
                  Statement or the Prospectus.

                  (j) (i) None of the Transaction Entities or their subsidiaries
            or any Property shall have sustained since the date of the latest
            audited financial statements included in the Prospectus any loss or
            interference with its business 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 set forth or contemplated in the Prospectus or (ii) since
            such date there shall not have been any change in the capital stock
            or long-term debt of either Transaction Entity or any change, or any
            development involving a prospective change, in or affecting any
            Property Affiliate or Property or the general affairs, management,
            financial position, shareholders' equity or results of operations of
            either Transaction Entity, otherwise than as set forth or
            contemplated in the Prospectus, the effect of which, in any such
            case described in clause (i) or (ii), is, in the judgment of the
            Underwriters, so material and adverse as to make it impracticable or
            inadvisable to proceed with the public offering or the delivery of
            the Notes being delivered on the Delivery Date on the terms and in
            the manner contemplated in the Prospectus.

                  (k) Subsequent to the execution and delivery of this Agreement
            there shall not have occurred any of the following: (i) trading in
            securities generally on the New York Stock Exchange or the American
            Stock Exchange or in the over-the-counter market, or trading in any
            securities of the Company on any exchange or in the over-the-counter
            market, shall have been suspended or minimum prices shall have been
            established on any such exchange or such market by the Commission,
            by such exchange or by any other regulatory body or governmental
            authority having jurisdiction, (ii) a banking moratorium shall have
            been declared by Federal or state authorities or there shall have
            occurred a material disruption in commercial banking or securities
            settlement or clearance services in the United States, (iii) the
            United States shall have become engaged in hostilities, there shall
            have been an escalation in hostilities involving the United States
            or there shall have been a declaration of a national emergency or
            war by the United States or (iv) there shall have occurred any other
            calamity or crisis in the United States or

                                       27

            elsewhere resulting in a material disruption in the financial
            markets in the United States or there shall have occurred such a
            material adverse change in general economic, political or financial
            conditions (or the effect of international conditions on the
            financial markets in the United States shall be such) as to make it,
            in the judgment of a majority in interest of the several
            Underwriters, impracticable or inadvisable to proceed with the
            public offering or delivery of the Notes being delivered on the
            Delivery Date on the terms and in the manner contemplated in the
            Prospectus.

                  (l) Subsequent to the execution and delivery of this Agreement
            (i) no downgrading shall have occurred in the rating accorded the
            Operating Partnership's debt securities by any "nationally
            recognized statistical rating organization," as that term is defined
            by the Commission for purposes of Rule 436(g)(2) of the Rules and
            Regulations and (ii) no such organization shall have publicly
            announced that it has under surveillance or review, with possible
            negative implications, its rating of any of the Operating
            Partnership's debt securities.

                  (m) The Transaction Entities shall not have failed at or prior
            to the Delivery Date to have performed or complied with any of their
            agreements herein contained and required to be performed or complied
            with by them hereunder at or prior to the Delivery Date.

                  (n) On the Delivery Date, counsel for the Underwriters shall
            have been furnished with such documents and opinions as they may
            require for the purpose of enabling them to pass upon the issuance
            and sale of the Notes as herein contemplated and related
            proceedings, or in order to evidence the accuracy of any of the
            representations or warranties, or the fulfillment of any of the
            conditions, herein contained; and all proceedings taken by the
            Transaction Entities in connection with the issuance and sale of the
            Notes as herein contemplated shall be satisfactory in form and
            substance to the Underwriters and counsel for the Underwriters.

                  (o) The Operating Partnership shall have furnished or caused
            to be furnished to the Underwriters such further certificates and
            documents as the Underwriters shall have reasonably requested.

            All opinions, letters, evidence and certificates mentioned above or
elsewhere in this Agreement shall be deemed to be in compliance with the
provisions hereof only if they are in form and substance reasonably satisfactory
to counsel for the Underwriters.

            Any certificate or document signed by any officer of the Transaction
Entities and delivered to the Underwriters, or to counsel for the Underwriters,
shall be deemed a representation and warranty by the Transaction Entities to
each Underwriter as to the statements made therein.

            8. Effective Date of Agreement. This Agreement shall become
effective: (i) upon the execution hereof by the parties hereto; or (ii) if, at
the time this Agreement is executed

                                       28

and delivered, it is necessary for the Registration Statement or a
post-effective amendment thereto to be declared 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.

            9. Default by One or More of the Underwriters. If, on the Delivery
Date, any Underwriter defaults in the performance of its obligations under this
Agreement, the remaining non-defaulting Underwriters shall be obligated to
purchase the Notes which the defaulting Underwriter agreed but failed to
purchase on the Delivery Date in the respective proportions which the principal
amount of Notes set forth opposite the name of each remaining non-defaulting
Underwriter in Schedule I hereto bears to the total aggregate principal amount
of Notes set forth opposite the names of all the remaining non-defaulting
Underwriters in Schedule I hereto; provided, however, that the remaining
non-defaulting Underwriters shall not be obligated to purchase any of the Notes
on the Delivery Date if the total aggregate principal amount of Notes which the
defaulting Underwriter or Underwriters agreed but failed to purchase on such
date exceeds 9.09% of the total aggregate principal amount of Notes to be
purchased on the Delivery Date, and any remaining non-defaulting Underwriter
shall not be obligated to purchase more than 110% of the aggregate principal
amount of Notes which it agreed to purchase on the Delivery Date pursuant to the
terms of Section 2. If the foregoing maximums are exceeded, the remaining
non-defaulting Underwriters, or those other underwriters satisfactory to the
Underwriters who so agree, shall have the right, but shall not be obligated, to
purchase, in such proportion as may be agreed upon among them, all the Notes to
be purchased on the Delivery Date. If the remaining Underwriters or other
underwriters satisfactory to the Underwriters do not elect to purchase the Notes
which the defaulting Underwriter or Underwriters agreed but failed to purchase
on the Delivery Date, this Agreement shall terminate without liability on the
part of any non-defaulting Underwriter or the Transaction Entities, except that
the Transaction Entities will continue to be liable for the payment of expenses
to the extent set forth in Sections 6 and 12. As used in this Agreement, the
term "Underwriter" includes, for all purposes of this Agreement unless the
context requires otherwise, any party not listed in Schedule I hereto who,
pursuant to this Section 9, purchases Notes which a defaulting Underwriter
agreed but failed to purchase.

            Nothing contained herein shall relieve a defaulting Underwriter of
any liability it may have to the Transaction Entities for damages caused by its
default. If other underwriters are obligated or agree to purchase the Notes of a
defaulting or withdrawing Underwriter, either the Underwriters or the Company
may postpone the Delivery Date for up to seven full business days in order to
effect any changes that in the opinion of counsel for the Operating Partnership
or counsel for the Underwriters may be necessary in the Registration Statement,
the Prospectus or in any other document or arrangement.

            10. Indemnification and Contribution.

                  (a) The Transaction Entities jointly and severally, shall
            indemnify and hold harmless each Underwriter, its officers and
            employees and each person, if any, who controls any Underwriter
            within the meaning of the Securities Act, from and against any loss,
            claim, damage or liability, joint or several, or any action in
            respect thereof (including, but not limited to, any loss, claim,
            damage, liability or

                                       29

            action relating to purchases and sales of Notes), to which that
            Underwriter, officer, employee or controlling person may become
            subject, under the Securities Act or otherwise, insofar as such
            loss, claim, damage, liability or action arises out of, or is based
            upon, (i) any untrue statement or alleged untrue statement of a
            material fact contained in any Preliminary Prospectus, the
            Registration Statement or the Prospectus or in any amendment or
            supplement thereto, (ii) the omission or alleged omission to state
            in any Preliminary Prospectus, the Registration Statement or the
            Prospectus, or in any amendment or supplement thereto, any material
            fact required to be stated therein or necessary to make the
            statements therein not misleading (with respect to the Prospectus,
            in light of the circumstances under which they were made), or (iii)
            any act or failure to act or any alleged act or failure to act by
            any Underwriter in connection with, or relating in any manner to,
            the Notes or the offering contemplated hereby, and which is included
            as part of or referred to in any loss, claim, damage, liability or
            action arising out of or based upon matters covered by clause (i) or
            (ii) above (provided that the Transaction Entities shall not be
            liable under this clause (iii) to the extent that it is determined
            in a final judgment by a court of competent jurisdiction that such
            loss, claim, damage, liability or action resulted directly from any
            such acts or failures to act undertaken or omitted to be taken by
            such Underwriter through its gross negligence or willful
            misconduct), and shall reimburse each Underwriter and each such
            officer, employee or controlling person for any legal or other
            expenses reasonably incurred by that Underwriter, officer, employee
            or controlling person in connection with investigating or defending
            or preparing to defend against any such loss, claim, damage,
            liability or action as such expenses are incurred; provided,
            however, that the Transaction Entities shall not be liable in any
            such case to the extent that any such loss, claim, damage, liability
            or action arises out of, or is based upon, any untrue statement or
            alleged untrue statement or omission or alleged omission made in any
            Preliminary Prospectus, the Registration Statement or the
            Prospectus, or in any such amendment or supplement, in reliance upon
            and in conformity with written information concerning such
            Underwriter furnished to the Transaction Entities through the
            Underwriters by or on behalf of any Underwriter specifically for
            inclusion therein; provided further, that the Transaction Entities
            shall not be liable in any such case to the extent that any such
            loss, claim, damage, liability or action to or by any person arises
            out of, or is based upon, any untrue statement or omission of
            material fact made in any prospectus, to the extent that any such
            loss, claim, damage or liability or action to or by such person
            results from the fact that (i) the Company had previously furnished
            copies of the Prospectus to the Underwriters, (ii) delivery of the
            Prospectus was required by the Securities Act to be made to such
            person, (iii) the untrue statement or omission of a material fact
            contained in the prospectus was corrected in the Prospectus, (iv)
            there was not sent or given to such person, at or prior to the
            written confirmation of the sale of such securities to such person,
            a copy of the Prospectus and (v) such correction would have cured
            the defect giving rise to such loss, damage or liability. The
            foregoing indemnity agreement is in addition to any liability which
            the Transaction Entities may

                                       30

            otherwise have to any Underwriter or to any officer, employee or
            controlling person of that Underwriter.

                  (b) Each Underwriter, severally and not jointly, shall
            indemnify and hold harmless each Transaction Entity, its officers
            and employees, each of its trustees, and each person, if any, who
            controls each Transaction Entity within the meaning of the
            Securities Act, from and against any loss, claim, damage or
            liability, joint or several, or any action in respect thereof, to
            which each Transaction Entity or any such trustee, officer or
            controlling person may become subject, under the Securities Act or
            otherwise, insofar as such loss, claim, damage, liability or action
            arises out of, or is based upon, (i) any untrue statement or alleged
            untrue statement of a material fact contained in any Preliminary
            Prospectus, the Registration Statement or the Prospectus or in any
            amendment or supplement thereto, or (ii) the omission or alleged
            omission to state in any Preliminary Prospectus, the Registration
            Statement or the Prospectus, or in any amendment or supplement
            thereto any material fact required to be stated therein or necessary
            to make the statements therein not misleading, but in each case only
            to the extent that the untrue statement or alleged untrue statement
            or omission or alleged omission was made in reliance upon and in
            conformity with written information concerning such Underwriter
            furnished to the Transaction Entities through the Underwriters by or
            on behalf of that Underwriter specifically for inclusion therein,
            and shall reimburse each Transaction Entity and any such trustee,
            officer or controlling person for any legal or other expenses
            reasonably incurred by each Transaction Entity or any such trustee,
            officer or controlling person in connection with investigating or
            defending or preparing to defend against any such loss, claim,
            damage, liability or action as such expenses are incurred. The
            foregoing indemnity agreement is in addition to any liability which
            any Underwriter may otherwise have to each Transaction Entity or any
            such trustee, officer, employee or controlling person.

                  (c) Promptly after receipt by an indemnified party under this
            Section 10 of notice of any claim or the commencement of any action,
            the indemnified party shall, if a claim in respect thereof is to be
            made against the indemnifying party under this Section 10, notify
            the indemnifying party in writing of the claim or the commencement
            of that action; provided, however, that the failure to notify the
            indemnifying party shall not relieve it from any liability which it
            may have under this Section 10 except to the extent it has been
            materially prejudiced by such failure and, provided further, that
            the failure to notify the indemnifying party shall not relieve it
            from any liability which it may have to an indemnified party
            otherwise than under this Section 10. If any such claim or action
            shall be brought against an indemnified party, and it shall notify
            the indemnifying party thereof, the indemnifying party shall be
            entitled to participate therein and, to the extent that it wishes,
            jointly with any other similarly notified indemnifying party, to
            assume the defense thereof with counsel reasonably satisfactory to
            the indemnified party. After notice from the indemnifying party to
            the indemnified party of its election to assume the defense of such
            claim or action, the indemnifying party shall not be liable to the
            indemnified party under this Section

                                       31

            10 for any legal or other expenses subsequently incurred by the
            indemnified party in connection with the defense thereof other than
            reasonable costs of investigation; provided, however, that the
            indemnified party shall have the right to employ its own counsel,
            with such counsel, in the case of the Underwriters, to represent
            jointly the Underwriters and their respective officers, employees
            and controlling persons who may be subject to liability arising out
            of any claim in respect of which indemnity may be sought by the
            Underwriters against the Transaction Entities under this Section 10
            if, in the reasonable judgment of the Underwriters, it is advisable
            for the Underwriters and those officers, employees and controlling
            persons to be jointly represented by separate counsel, and in that
            event the fees and expenses of such separate counsel shall be paid
            by the Transaction Entities. No indemnifying party shall (i) without
            the prior written consent of the indemnified parties (which consent
            shall not be unreasonably withheld), settle or compromise or consent
            to the entry of any judgment with respect to any pending or
            threatened claim, action, suit or proceeding in respect of which
            indemnification or contribution may be sought hereunder (whether or
            not the indemnified parties are actual or potential parties to such
            claim or action) unless such settlement, compromise or consent
            includes an unconditional release of each indemnified party from all
            liability arising out of such claim, action, suit or proceeding, or
            (ii) be liable for any settlement of any such action effected
            without its written consent (which consent shall not be unreasonably
            withheld), but if settled with the consent of the indemnifying party
            or if there be a final judgment of the plaintiff in any such action,
            the indemnifying party agrees to indemnify and hold harmless any
            indemnified party from and against any loss or liability by reason
            of such settlement or judgment.

                  (d) If the indemnification provided for in this Section 10
            shall for any reason be unavailable to or insufficient to hold
            harmless an indemnified party under Section 10(a) or 10(c) in
            respect of any loss, claim, damage or liability, or any action in
            respect thereof, referred to therein, then each indemnifying party
            shall, in lieu of indemnifying such indemnified party, contribute to
            the amount paid or payable by such indemnified party as a result of
            such loss, claim, damage or liability, or action in respect thereof,
            (i) in such proportion as shall be appropriate to reflect the
            relative benefits received by the Transaction Entities on the one
            hand and the Underwriters on the other 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 Transaction Entities, on
            the one hand, and the Underwriters, on the other hand, with respect
            to the statements or omissions which resulted in such loss, claim,
            damage or liability, or action in respect thereof, as well as any
            other relevant equitable considerations. The relative benefits
            received by the Transaction Entities, on the one hand, and the
            Underwriters, on the other hand, with respect to such offering shall
            be deemed to be in the same proportion as the total net proceeds
            from the offering of the Notes purchased under this Agreement
            (before deducting expenses) received by the Transaction Entities, on
            the one hand, and the total underwriting discounts and commissions
            received by the Underwriters with

                                       32

            respect to the Notes purchased under this Agreement, on the other
            hand, bear to the total gross proceeds from the offering of the
            Notes under this Agreement, in each case as set forth in the table
            on the cover page of the Prospectus. The relative fault shall be
            determined by reference to whether the untrue or alleged untrue
            statement of a material fact or omission or alleged omission to
            state a material fact relates to information supplied by the
            Transaction Entities or the Underwriters, the intent of the parties
            and their relative knowledge, access to information and opportunity
            to correct or prevent such statement or omission. The Transaction
            Entities and the Underwriters agree that it would not be just and
            equitable if contributions pursuant to this Section were to be
            determined by pro rata allocation (even if the Underwriters were
            treated as one entity for such purpose) or by any other method of
            allocation which does not take into account the equitable
            considerations referred to herein. The amount paid or payable by an
            indemnified party as a result of the loss, claim, damage or
            liability, or action in respect thereof, referred to above in this
            Section shall be deemed to include, for purposes of this Section
            10(d), any legal or other expenses reasonably incurred by such
            indemnified party in connection with investigating or defending any
            such action or claim. Notwithstanding the provisions of this Section
            10(d), 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 it and distributed to the public was offered to the
            public exceeds the amount of any damages which such Underwriter has
            otherwise paid or become liable to pay by reason of any untrue or
            alleged untrue statement or omission or alleged omission. No person
            guilty of fraudulent misrepresentation (within the meaning of
            section 11(f) of the Securities Act) shall be entitled to
            contribution from any person who was not guilty of such fraudulent
            misrepresentation. The Underwriters' obligations to contribute as
            provided in this Section 10(d) are several in proportion to their
            respective underwriting obligations and not joint.

                  (e) The Underwriters severally confirm that the statements on
            pages S-15 and S-16 of the prospectus supplement to the Prospectus
            dated January 10, 2003: (i) with respect to the concession and
            reallowance figures in the fourth paragraph and (ii) in the seventh,
            eighth and ninth paragraphs, are correct and each Transaction Entity
            acknowledges that these statements constitute, except as provided in
            the following sentence, the only information concerning such
            Underwriters furnished in writing to the Transaction Entities by or
            on behalf of the Underwriters specifically for inclusion in the
            Registration Statement, the Preliminary Prospectus, if any, and the
            Prospectus. CSFB confirms that the statements on page S-16 of the
            prospectus supplement to the Prospectus dated January 10, 2003 in
            the twelfth paragraph are correct.

            11. Termination. The obligations of the Underwriters hereunder may
be terminated by the Underwriters by notice given to and received by the
Operating Partnership prior to delivery of and payment for the Notes if, prior
to that time, any of the events described in Sections 7(i), 7(j), 7(k), 7(l) or
7(m), shall have occurred or if the Underwriters shall decline to purchase the
Notes for any reason permitted under this Agreement.

                                       33

            12. Reimbursement of Underwriters' Expenses. If the Operating
Partnership shall fail to tender the Notes for delivery to the Underwriters by
reason of any failure, refusal or inability on the part of the Transaction
Entities to perform any agreement on their part to be performed, or because any
other condition of the Underwriters' obligations hereunder required to be
fulfilled by the Transaction Entities is not fulfilled, the Transaction Entities
will reimburse the Underwriters for all reasonable out-of-pocket expenses
(including fees and disbursements of counsel) incurred by the Underwriters in
connection with this Agreement and the proposed purchase of the Notes, and upon
demand the Transaction Entities shall pay the full amount thereof to the
Underwriters. If this Agreement is terminated pursuant to Section 9 by reason of
the default of one or more Underwriters, the Transaction Entities shall not be
obligated to reimburse any defaulting Underwriter on account of those expenses.

            13. Representation of CSFB. CSFB represents to the Operating
Partnership that, on the Delivery Date, CSFB will deliver the Exchange Notes to
the Operating Partnership free and clear of any pledge, lien, security interest,
encumbrance or claim that CSFB created, permitted or imposed on the Exchange
Notes; and to the knowledge of CSFB, the Exchange Notes to be delivered by CSFB
pursuant to this Agreement were at the time acquired by CSFB free of any
pledges, liens, security interests, encumbrances or claims; and CSFB has full
power and authority to effect the delivery of the Exchange Notes as contemplated
by this Agreement. CSFB has not acted and is not acting as agent for the
Operating Partnership in its acquisition of the Exchange Notes.

            14. Notices, etc. All statements, requests, notices and agreements
hereunder shall be in writing, and:

                  (a) if to the Underwriters, shall be delivered or sent by
            mail, telex or facsimile transmission to Credit Suisse First Boston
            Corporation, Eleven Madison Avenue, New York, New York 10010,
            Attention: Transactions Advisory Group;

                  (b) if to the Transaction Entities shall be delivered or sent
            by mail, telex or facsimile transmission to the Company, 65 Valley
            Stream Parkway, Malvern, PA 19355, Attention: General Counsel (Fax:
            610-644-2175);

provided, however, that any notice to an Underwriter pursuant to Section 10(c)
shall be delivered or sent by mail, telex or facsimile transmission to such
Underwriter at its address set forth in its acceptance telex to the
Underwriters, which address will be supplied to any other party hereto by the
Underwriters upon request. Any such statements, requests, notices or agreements
shall take effect at the time of receipt thereof.

            15. Persons Entitled to Benefit of Agreement. This Agreement shall
inure to the benefit of and be binding upon the Underwriters, the Transaction
Entities and their respective personal representatives and successors. This
Agreement and the terms and provisions hereof are for the sole benefit of only
those persons, except that (A) the representations, warranties, indemnities and
agreements of the Transaction Entities contained in this Agreement shall also be
deemed to be for the benefit of the person or persons, if any, who control any
Underwriter within the meaning of Section 15 of the Securities Act and (B) the
indemnity agreement of the Underwriters contained in Section 10(b) of this
Agreement shall be deemed to be for the benefit of trustees of the Company,
officers of the Company who have signed the Registration Statement

                                       34

and any person controlling the Transaction Entities within the meaning of
section 15 of the Securities Act. Nothing in this Agreement is intended or shall
be construed to give any person, other than the persons referred to in this
Section 15, any legal or equitable right, remedy or claim under or in respect of
this Agreement or any provision contained herein.

            16. Survival. The respective indemnities, representations,
warranties and agreements of the Transaction Entities and the Underwriters
contained in this Agreement or made by or on behalf on them, respectively,
pursuant to this Agreement, shall survive the delivery of and payment for the
Notes and shall remain in full force and effect, regardless of any investigation
made by or on behalf of any of them or any person controlling any of them.

            17. Definition of the Terms "Business Day" and "Subsidiary". For
purposes of this Agreement, (a) "business day" means any day on which the New
York Stock Exchange, Inc. is open for trading and (b) "subsidiary" has the
meaning set forth in Rule 405 of the Rules and Regulations.

            18. Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of New York.

            19. Counterparts. This Agreement may be executed in one or more
counterparts and, if executed in more than one counterpart, the executed
counterparts shall each be deemed to be an original but all such counterparts
shall together constitute one and the same instrument.

            20. Headings. The headings herein are inserted for convenience of
reference only and are not intended to be part of, or to affect the meaning or
interpretation of, this Agreement.

                                       35

            If the foregoing correctly sets forth the agreement between the
Company and the Underwriters, please indicate your acceptance in the space
provided for that purpose below.

                                  Very truly yours,

                                  LIBERTY PROPERTY TRUST


                                  By  /s/ George J. Alburger, Jr.
                                      Name:  George J. Alburger, Jr.
                                      Title: Executive Vice President and Chief
                                             Financial Officer


                                  LIBERTY PROPERTY LIMITED PARTNERSHIP

                                      By:  Liberty Property Trust, its general
                                           partner


                                             By:  /s/ George J. Alburger, Jr.
                                             Name:  George J. Alburger, Jr.
                                             Title: Executive Vice President and
                                                    Chief Financial Officer



Accepted:

CREDIT SUISSE FIRST BOSTON CORPORATION

By:  /s/ Greg Ivancich
     Name: Greg Ivancich
     Title: Director


UBS WARBURG LLC

By:  /s/ Edward Arden
     Name: Edward Arden
     Title: Executive Director

By:  /s/ Ryan Donovan
     Name: Ryan Donovan
     Title: Associate Director

                                       36

                                   SCHEDULE I



                     UNDERWRITERS                      PRINCIPAL AMOUNT OF NOTES
                     ------------                      -------------------------
                                                    
Credit Suisse First Boston Corporation                       $42,500,000
UBS Warburg LLC                                              $42,500,000
                                                             -----------
                                                             $85,000,000
                                                             ===========


                                       37

                                   SCHEDULE II


Senior Notes Due 2012

Principal Amount        $85,000,000
Coupon:                 6.375%
Settlement Date:        January 15, 2003

Price to Public:        102.829%
Price to Public:        $87,404,650

Underwriting Discount:  0.650%
Underwriting Discount:  $552,500

Price to Company:                          102.179%
Proceeds to the Company (before expenses)  $86,852,150, such Purchase Price to
be paid by the Underwriters as set forth in Sections 2 and 4 of this Agreement

Maturity Date: August 15, 2012

Reopened Series: $150,000,000 of the Operating Partnership's Senior Notes 2012
were issued on August 22, 2002.

                                       38

                                  SCHEDULE III

Florida, Kansas, Maryland, Michigan, Minnesota, New Jersey, North Carolina,
South Carolina, Texas, Virginia and Wisconsin.

                                       39