LIBERTY PROPERTY TRUST
8-K, EX-1.1, 2000-08-03
REAL ESTATE INVESTMENT TRUSTS
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                                                                     EXHIBIT 1.1

                      LIBERTY PROPERTY LIMITED PARTNERSHIP

                      (a Pennsylvania Limited Partnership)

                   $200,000,000 8 -1/2% SENIOR NOTES DUE 2010

                             UNDERWRITING AGREEMENT

                                                                   July 26, 2000

Lehman Brothers Inc.,
Banc One Capital Markets, Inc.
Donaldson, Lufkin & Jenrette Securities Corporation
Goldman, Sachs & Co.
Salomon Smith Barney Inc.

c/o Lehman Brothers Inc.
Three World Financial Center
New York, New York 10285

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 Lehman Brothers
Inc., Banc One Capital Markets, Inc., Donaldson, Lufkin & Jenrette Securities
Corporation, Goldman, Sachs & Co., and Salomon Smith Barney Inc. (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 $200,000,000 aggregate principal amount of its
8-1/2% Senior Notes due 2010 (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) Registration statements on Form S-3 (Nos.
                  333-43267 (the "1998 Registration Statement") and 333-39282
                  (the "2000 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


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<PAGE>   2

                  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 Fourth
                  Supplemental Indenture, to be dated as of July 31, 2000,
                  between the Operating Partnership and the Trustee (the
                  "Supplemental Indenture"), pursuant to which the Notes shall
                  be issued, will be qualified, under the Trust Indenture Act of
                  1939 (the "Trust Indenture Act"). Copies of such registration
                  statements and any amendments thereto have been delivered by
                  the Company to you. As used in this Agreement, "Effective
                  Time" means, for either registration statement, the date and
                  the time as of which either registration statement, or the
                  most recent post-effective amendment thereto, if any, was
                  declared effective by the Commission; "Effective Date" means,
                  for either registration statement, the date of the Effective
                  Time; "Preliminary Prospectus" means any prospectus included
                  in either 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 both the
                  1998 Registration Statement and the 2000 Registration
                  Statement, together, each as amended at the respective
                  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


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<PAGE>   3

                  the Commission pursuant to EDGAR, except to the extent
                  permitted by Regulation S-T.

                           (c) 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
                  conforms, and the Supplemental Indenture will 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


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                  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 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, Liberty Property Development Corp. ("Development
                  Corp."), Liberty Property Development Corp.-II
                  ("Development-II"), Liberty Property Development Corp.- III
                  ("Development- III") and Liberty Special Purpose Trust ("SP
                  Trust")) 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"), no shares of beneficial interest of the
                  Company are reserved for any purpose and except for the equity
                  interests in the Operating Partnership ("Units"), the
                  Operating Partnership's Exchangeable Subordinated Debentures
                  due 2001 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, 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


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                  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.

                           (i) 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) 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) Development-III has been duly organized and is
                  validly existing as a corporation in good standing under the
                  laws of the Commonwealth of


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                  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-III 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-III 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-III are reserved for any purpose, and there are no
                  outstanding securities convertible into or exchangeable for
                  any capital stock of Development-III, 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-III.

                           (l) 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
                  compliance with all applicable laws (including, without
                  limitation, federal or state securities laws) and all of the
                  equity interests of SP Trust is 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

                           (m) 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 and Liberty Property Philadelphia Trust, a
                  Pennsylvania trust, 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, as the case may be, is duly qualified to do
                  business and is in good standing under the laws of the
                  jurisdiction in which it was organized, and as the case may
                  be, 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


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<PAGE>   7

                  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.

                           (n) 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.

                           (o) The Indenture has been, and the Supplemental
                  Indenture will be, duly authorized, and when duly executed and
                  delivered by the Operating Partnership (assuming due execution
                  and delivery by the Trustee), shall constitute a valid and
                  binding agreement on the part 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.

                           (p) (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, has been duly and validly
                  authorized, executed and delivered by the parties thereto and
                  is a valid and binding agreement of the parties thereto,
                  enforceable against such parties in accordance with its terms.

                           (q) 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


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                  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.

                           (r) 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.

                           (s) Other than as described in the Prospectus, as
                  disclosed to Lehman Brothers Inc. 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, 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.

                           (t) Except as described or contemplated in the
                  Prospectus or pursuant to the Share Incentive Plan, 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.

                           (u) 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


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<PAGE>   9

                  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.

                           (v) 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 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.

                           (w) 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.

                           (x) (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, Development-II and
                  Development III 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


                                       13
<PAGE>   10

                  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.

                           (y) 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.

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

                           (aa) 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,
                  the operations of the Company, the Operating Partnership,
                  Development Corp., Development II, Development III, SP Trust,
                  and 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


                                       14
<PAGE>   11

                  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 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.

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


                                       15
<PAGE>   12

                           (cc) 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.

                           (dd) 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.

                           (ee) 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.

                           (ff) 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.

                           (gg) 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.

                           (hh) Each Transaction Entity is 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"); 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 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
                  so qualified in all


                                       16
<PAGE>   13

                  material respects and nothing has occurred, whether by action
                  or by failure to act, which would cause the loss of such
                  qualification.

                           (ii) 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.

                           (jj) At all times since June 16, 1994, the Company,
                  the Operating Partnership, Development Corp., Development II,
                  Development III 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 of the
                  Company as a real estate investment trust under the Code and
                  the proposed method of operation of the Company, the Operating
                  Partnership, Development Corp., Development II, Development
                  III 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.

                           (kk) 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).

                           (ll) Each Transaction Entity and 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.

                           (mm) 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


                                       17
<PAGE>   14

                  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.

                           (nn) 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.

                           (oo) Neither Transaction Entity or 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.

                           (pp) 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.

                           (qq) 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.

                  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 Rogers &
Wells LLP, 200 Park Avenue, New York, New York 10166, at 10:00 A.M., New York
City time, on the third full business day


                                       18
<PAGE>   15

following the 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 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. 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
                  Commission, including


                                       19
<PAGE>   16

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


                                       20
<PAGE>   17

                           (g) For a period of five years following the
                  applicable Effective Date, to furnish to the Underwriters
                  copies of all materials furnished by the Operating Partnership
                  to its shareholders and all public reports and all reports and
                  financial statements furnished by the Operating Partnership to
                  the Commission pursuant to the Exchange Act or any rule or
                  regulation of the Commission thereunder;

                           (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, real estate
                  syndication or Blue Sky laws 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 Lehman Brothers Inc.;

                           (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 neither the Company, the Operating Partnership nor
                  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.


                                       21
<PAGE>   18

                  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


                                       22
<PAGE>   19

                  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
                           Delaware, Florida, Kansas, Maryland, Michigan,
                           Minnesota, New Jersey, North Carolina, South
                           Carolina, Tennessee, 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. 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 extent that such interests


                                       23
<PAGE>   20

                           are owned by the Company, are owned by the Company
                           free and clear of all liens, encumbrances, equities
                           or claims.

                                    (iii) Development Corp. 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 as a foreign
                           corporation in Delaware, 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. 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.

                                    (iv) Development-II 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 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. 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.

                                    (v) Development-III is validly existing as a
                           corporation in good standing under the laws of the
                           Commonwealth of Pennsylvania 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. All of the issued and outstanding
                           capital stock of Development-III 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-III 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.


                                       24
<PAGE>   21

                                    (vi) SP Trust is validly existing as a
                           business trust in good standing 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. 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,
                           are owned by the Company free and clear of any
                           security interest, mortgage, pledge, lien,
                           encumbrance, claim, restriction or equities and have
                           been offered and sold in compliance with all
                           applicable laws (including, without limitation,
                           federal or state securities laws).

                                    (vii) Each of the Property Affiliates is
                           validly existing as a limited partnership, limited
                           liability company or other entity in good standing
                           under the laws of the jurisdiction in which it was
                           organized, 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 partnership interests,
                           membership interests or other equity interests, as
                           the case may be, of each Property Affiliate have been
                           duly and validly authorized and issued, are fully
                           paid and non-assessable and all such 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.

                                    (viii)(A) 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, and assuming
                           due authorization, execution and delivery by the
                           Underwriters and due authorization by the Company, is
                           a valid and binding agreement of the Operating
                           Partnership; and (B) the Operating Partnership
                           Agreement and the partnership agreement, limited
                           liability company agreement or similar such document
                           of each Property Affiliate, have been duly and
                           validly authorized, executed and delivered by each
                           Transaction Entity party thereto and are valid and
                           binding agreements of the parties thereto,
                           enforceable against such parties in accordance with
                           their terms.

                                    (ix) The 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; the Indenture conforms in all material
                           respects to the descriptions thereof contained in the
                           Prospectus.

                                    (x) The Notes have been duly authorized,
                           executed, issued and delivered by the Operating
                           Partnership, and constitute valid and binding
                           obligations of the Operating Partnership entitled to
                           the benefits of the


                                       25
<PAGE>   22

                           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, which to such counsel's
                           knowledge, after due inquiry, are free and clear of
                           all security interests, mortgages, pledges, liens,
                           encumbrances, claims, restrictions and equities. The
                           terms of the Notes conform to all statements and
                           descriptions related thereto contained in the
                           Prospectus. The Notes rank and will rank on a parity
                           with all unsecured indebtedness (other than
                           subordinated indebtedness of the Operating
                           Partnership that is outstanding on the date thereof
                           or that may be incurred thereafter), and senior to
                           all subordinated indebtedness of the Operating
                           Partnership that is outstanding on the date thereof
                           or that may be incurred thereafter, except that the
                           Notes will be effectively subordinated to the prior
                           claims of each secured mortgage lender to any
                           specific Property which secures such lender's
                           mortgage.

                                    (xi) 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 to which either of the Transaction
                           Entities or their subsidiaries is a party or by which
                           either of the Transaction Entities or their
                           subsidiaries is bound 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;
                           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 or the Indenture by the
                           Transaction Entities and the consummation of the
                           transactions contemplated hereby and thereby, and the
                           issuance and delivery of the Notes.

                                    (xii) The issuance and delivery of the Notes
                           by the Operating Partnership and the compliance by
                           the Operating Partnership with all of the provisions
                           of this Agreement, and the consummation of the
                           transactions contemplated hereby, have been duly
                           authorized by all necessary partnership action. The
                           execution, delivery and performance of this Agreement
                           by each of the Transaction Entities and the
                           consummation


                                       26
<PAGE>   23

                           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.

                                    (xiii) 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.

                                    (xiv) To the knowledge of such counsel,
                           other than as set forth in the Prospectus and other
                           than certain persons who have contributed Properties
                           to the Partnership in exchange for Units and rights
                           of persons whose securities are already registered
                           under the Securities Act, 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, 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.

                                    (xv) 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 which are not disclosed in the Prospectus
                           and which, if determined adversely to such
                           Transaction Entity or subsidiary, 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 knowledge of such counsel
                           no such proceedings are threatened or contemplated by
                           governmental authorities or threatened by others.

                                    (xvi) 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.


                                       27
<PAGE>   24

                                    (xvii) To the knowledge of such counsel, 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, which is required to be described in
                           the Prospectus which is not so described.

                                    (xviii) To the knowledge of such counsel,
                           each Transaction Entity is in compliance in all
                           material respects with all presently applicable
                           provisions of ERISA; to the knowledge of such
                           counsel, 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; to the knowledge of such
                           counsel, 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) section 412 or 4971
                           of the Code; and, to the knowledge of such counsel,
                           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 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.

                                    (xix) To the knowledge of such counsel, no
                           Transaction Entity or Property Affiliate is in
                           violation of its charter, by-laws, certificate of
                           limited partnership, agreement of limited
                           partnership, or other similar organizational
                           document, nor, to the knowledge of such counsel, has
                           a default been asserted in any respect, and it has
                           not been asserted that any 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 material 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.

                                    (xx) 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, real estate syndication or Blue Sky laws
                           governing the purchase and distribution of the Notes)
                           for the valid issuance and sale of the Notes to the
                           Underwriters as contemplated by this Agreement.

                                    (xxi) Neither Transaction Entity or 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.


                                       28
<PAGE>   25

                                    (xxii) 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 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.

                                    (xxiii) 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, 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 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.

                                    (xxiv) 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,
                           the Rules and Regulations and the Trust Indenture Act
                           and the rules and regulations thereunder, and the
                           Indenture conforms in all material respects to the
                           requirements of the Trust Indenture Act and the rules
                           and regulations thereunder.

                                    (xxv) The Operating Partnership is
                           classified as a partnership (and is not taxed as a
                           corporation) for federal income tax purposes.

                                    (xxvi) The statements contained in the
                           Prospectus under the captions "Risk Factors,"
                           "Description of Debt Securities," "Description of
                           Preferred Shares," "Description of Warrants,"
                           "Description of Notes," and "Federal Income Tax
                           Considerations with Respect to the Trust and the
                           Operating Partnership" together with "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
                           constitute a fair summary thereof.

                  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


                                       29
<PAGE>   26

                  the opinion of Saul, Ewing, Remick & Saul LLP; (iii) state
                  that its opinion does not address (A) Federal Reserve Board
                  margin regulations; (B) Federal or state antitrust and unfair
                  competition laws and regulations; (C) Local Laws (as defined
                  in The Legal Opinion Accord of the ABA Section of Business Law
                  (1991); (D) compliance with fiduciary duty requirements; (E)
                  Federal and state racketeering laws and regulations; (F)
                  Federal and state health and safety laws and regulations; and
                  (G) Federal and state laws, regulations and policies
                  concerning (x) national and local emergency, (y) possible
                  judicial deference to acts of foreign states, and (z) criminal
                  and civil forfeiture laws; and (iv) in giving the opinion
                  referred to in subclause (B) in Section 7(d)(A)(vii)(A), 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, Remick & Saul 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, is in good standing with the State
                           Department of Assessments and Taxation of Maryland
                           and as a foreign trust or corporation in those
                           jurisdictions listed in such opinion, 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


                                       30
<PAGE>   27

                           Registration Statement and the Prospectus, and to
                           enter into and perform its obligations under this
                           Agreement.

                                    (ii) 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 in all material respects
                           to the description thereof contained in the
                           Prospectus.

                                    (iii) 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.

                                     (iv) 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.

                                    (v) 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.

                                    (vi) 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 Rogers & Wells
                  LLP, counsel for the Underwriters, may rely on its opinion.

                           (e) The Underwriters shall have received from
                  Clifford Chance Rogers & Wells 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.


                                       31
<PAGE>   28

                           (f) 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.

                           (g) 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 Operating Partnership shall have
                  furnished to the Underwriters a letter (the "bring-down
                  letter") of such accountants, 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.

                           (h) 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:

                                    (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 applicable 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


                                       32
<PAGE>   29

                           not misleading (with respect to the Prospectus, in
                           light of the circumstances in which they were made),
                           and (B) since the applicable Effective Date no event
                           has occurred which should have been set forth in a
                           supplement or amendment to the Registration Statement
                           or the Prospectus.

                           (i) (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.

                           (j) 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, (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 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.

                           (k) 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


                                       33
<PAGE>   30

                  negative implications, its rating of any of the Operating
                  Partnership's debt securities.

                           (l) 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.

                           (m) 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.

                           (n) 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 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


                                       34
<PAGE>   31

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 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 (A) in
any Preliminary Prospectus, the Registration Statement or the Prospectus or in
any amendment or supplement thereto or (B) in any blue sky application or other
document prepared or executed by the Operating Partnership (or based upon any
written information furnished by the Operating Partnership) specifically for the
purpose of qualifying any or all of the Notes under the securities laws of any
state or other jurisdiction (any such application, document or information being
hereinafter called a "Blue Sky Application"), (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, or in any Blue Sky
Application 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,


                                       35
<PAGE>   32

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, or in any Blue Sky Application, 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 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 (A) in any Preliminary Prospectus, the Registration Statement or the
Prospectus or in any amendment or supplement thereto, or (B) in any Blue Sky
Application 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, or in any Blue Sky Application 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


                                       36
<PAGE>   33

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 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


                                       37
<PAGE>   34

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 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 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 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 and each Transaction
Entity acknowledges that the statements with respect to the public offering of
the Notes by the Underwriters set forth on the cover page of, the concession and
reallowance figures appearing under the caption "Underwriting" and, pursuant to
Item 508 of Regulation S-K of the Securities Act, paragraph 3 and the last six
paragraphs of the section captioned "Plan of Distribution" in, the Preliminary
Prospectus, if any, and the comparable material in the Prospectus are correct
and constitute the only information concerning such Underwriters furnished in
writing to the


                                       38
<PAGE>   35

Transaction Entities by or on behalf of the Underwriters specifically for
inclusion in the Registration Statement, the Preliminary Prospectus, if any, and
the Prospectus.

                  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) or 7(l), shall
have occurred or if the Underwriters shall decline to purchase the Notes for any
reason permitted under this Agreement.

                  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. 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 Lehman
                  Brothers Inc., Three World Financial Center, New York, New
                  York 10285, Attention: Syndicate Department (Fax:
                  212-526-6588), with a copy, in the case of any notice pursuant
                  to Section 10(c), to the Director of Litigation, Office of the
                  General Counsel, Lehman Brothers Inc., 3 World Financial
                  Center, 10th Floor, New York, NY 10285;

                           (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. The Transaction Entities shall
be entitled to act and rely upon any request, consent, notice or agreement given
or made on behalf of the Underwriters by Lehman Brothers Inc.

                  14. 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,


                                       39
<PAGE>   36

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 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 14, any legal or equitable right, remedy or
claim under or in respect of this Agreement or any provision contained herein.

                  15. 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.

                  16. 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.

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

                  18. 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.

                  19. 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.


                                       40
<PAGE>   37

                  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/ Willard G. Rouse III
                                              ---------------------------------
                                              Name:   Willard G. Rouse III
                                              Title:  Chairman of the Board,
                                                      President and Chief
                                                      Executive Officer



                                          LIBERTY PROPERTY LIMITED PARTNERSHIP

                                          By:  Liberty Property Trust, its
                                               general partner


                                          By:  /s/ Willard G. Rouse III
                                               --------------------------------
                                               Name:    Willard G. Rouse III
                                               Title:   Chairman of the Board,
                                                        President and Chief
                                                        Executive Officer



Accepted:


LEHMAN BROTHERS INC.


By: /s/ Allen Cutler
    --------------------------
    Authorized Representative

For itself and on behalf of
the Underwriters


                                       41
<PAGE>   38

                                   SCHEDULE I


<TABLE>
<CAPTION>
                             UNDERWRITERS                        PRINCIPAL AMOUNT OF NOTES
                             ------------                        -------------------------
<S>                                                              <C>
Lehman Brothers Inc.                                                    $140,000,000
Banc One Capital Markets, Inc.                                            15,000,000
Donaldson, Lufkin & Jenrette Securities Corporation                       15,000,000
Goldman, Sachs & Co.                                                      15,000,000
Salomon Smith Barney Inc.                                                 15,000,000
                                                                        ------------
                                                                        $200,000,000
                                                                        ============
</TABLE>


                                       42
<PAGE>   39

                                   SCHEDULE II



Senior Notes Due 2010

Principal Amount  $200,000,000.00
Coupon:  8-1/2%
Settlement Date:  July 31, 2000

Price to Public:  99.344%
Price to Public:  $198,688,000

Underwriting Discount:     0.650%
Underwriting Discount:     $1,300,000

Price to Company:    98.694%
Proceeds to the Company (before expenses)   $197,388,000

Maturity Date:    August 1, 2010


                                       43


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