Exhibit 10.17


                               MOORESTOWN MALL LLC
                              c/o PREIT-Rubin, Inc.
                                  The Bellevue
                             200 South Broad Street
                        Philadelphia, Pennsylvania 19102

June 3, 2003


Lehman Brothers Bank, FSB
399 Park Avenue
New York, New York 10022


Re:           $64,250,000.00 first mortgage loan made by Lehman Brothers Bank,
              FSB (together with its successors and assigns, "Lender") to
              Moorestown Mall LLC ("Borrower") secured by, among other things, a
              first mortgage and security agreement (the "Security Instrument")
              on the Moorestown Mall, Moorestown, New Jersey (the "Property")

Gentlemen:

Reference is made to the Security Instrument. All capitalized terms not defined
herein shall have the meanings ascribed to them in the Security Instrument.

The Property is subject to the following reciprocal easement and operating
agreements (each, an "ROA"):

            A.    Retail Center Agreement between Rouse-Moorestown, Inc.
                  ("Developer") and The May Department Stores Company ("May"),
                  dated as of January 25, 2000 but effective as of March 26,
                  1999 (the "RCA").

            B.    Developer-Lord & Taylor Supplemental Agreement between
                  Developer and May, dated as of January 25, 2000 but effective
                  as of March 26, 1999 (the "L&T Agreement").

            C.    Developer-Strawbridge's Supplemental Agreement between
                  Developer and May, dated as of January 25, 2000 but effective
                  as of March 26, 1999 (the "Strawbridge Agreement").

            D.    Opening Date Agreement dated as of June 15, 2000 between
                  Developer and May.

In order to induce Lender to make the Loan, Borrower hereby agrees as follows:

            1.    Borrower shall not amend, modify or supplement any ROA without
                  Lender's prior written consent, which consent shall not be
                  unreasonably withheld or delayed except for amendments,
                  modifications or supplements of May's obligations with respect
                  to the operation of its premises in which instances Lender may
                  withhold its consent in its sole and absolute discretion.
                  Borrower shall pay all charges and other sums be paid by









                  Borrower pursuant to the terms of each ROA as the same shall
                  become due and payable and prior to the expiration of any
                  applicable grace period therein provided and perform all
                  services as required thereunder. Borrower shall comply, in all
                  material respects, with all the terms, covenants and
                  conditions on Borrower's part to be complied with pursuant to
                  the terms of each ROA. Borrower shall take all actions and
                  cause each other party to each ROA to take all actions, as may
                  be necessary from time to time to preserve and maintain the
                  ROA in accordance with applicable laws, rules and regulations.
                  Borrower shall not, without the prior written consent of
                  Lender, take (and hereby assigns to Lender any right it may
                  have to take) any action to terminate, surrender or accept any
                  termination or surrender of, any ROA. Borrower will promptly
                  provide Lender with a copy of all notices of defaults given or
                  received by it under each ROA in accordance with the notice
                  provision set forth in the Security Instrument. Borrower shall
                  enforce the obligations to be performed by each other party to
                  each ROA (including, but not limited to, any obligation to
                  operate a store), and shall not waive any such obligation or
                  release any such party from liability resulting from their
                  failure to perform any such obligation without Lender's prior
                  written consent, which consent shall not be unreasonably
                  withheld or delayed, except for waivers or releases of May's
                  obligations with respect to the operation of its premises in
                  which instances Lender may withhold its consent in its consent
                  in its sole and absolute discretion. Borrower shall not
                  exercise any right it may have to grant consent (or withhold
                  its consent) to any material requests by any party to any ROA,
                  except where such consent is required to be given, without
                  Lender's prior written approval, which approval shall not be
                  unreasonably withheld or delayed so long as the matter for
                  which Lender's approval is sought shall not affect May's
                  obligations with respect to the operation of its premises or
                  any material monetary obligation of May. Borrower shall not
                  assign (other than to Lender) or encumber any ROA. Borrower
                  shall not exercise any right it may have to perform, or
                  consent to, any material additions or improvements to the
                  Property or other properties subject to any ROA, without
                  Lender's prior written approval, which approval shall not be
                  unreasonably withheld or delayed so long as the matter for
                  which Lender's approval is sought shall not affect May's
                  obligation to operate its premises and Borrower is otherwise
                  permitted to make or consent to such additions pursuant to the
                  Loan Documents. If Lender, its nominee, designee, successor or
                  assignee acquires title to the Property and/or Borrower's
                  rights under any ROA by reason of foreclosure of the Security
                  Instrument, deed-in-lieu of foreclosure or otherwise, such
                  party shall (x) succeed to all rights of and benefits accruing
                  to Borrower under such ROA and (y) be entitled to exercise all
                  of the rights and benefits accruing to Borrower under the ROA.
                  Borrower agrees to promptly execute and deliver to Lender such
                  documents as Lender and its counsel may reasonably require in
                  order to ensure that the provisions of this section shall be
                  validly and legally enforceable and in effect against Borrower
                  and all parties claiming by, through, under or against
                  Borrower.







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            2.    Notwithstanding anything contained herein to the contrary, in
                  the event an Affiliate of Borrower, Federated Department
                  Stores Inc., Nordstrom, Inc., Saks Incorporated or Neiman
                  Marcus Group, Inc. (each a "Permitted Transferee") shall
                  acquire the current Lord & Taylor store property (block 3000
                  lot 3.02) (the "Lord & Taylor Property"), Borrower and such
                  Permitted Transferee may consent to the termination of the
                  covenant by May to continuously operate a Lord & Taylor store
                  pursuant to the L&T Agreement, so long as (1) if the acquiring
                  party is Borrower's Affiliate, Borrower's Affiliate shall have
                  entered into a bona fide space lease with a tenant acceptable
                  to Lender having a term at least equal to the unexpired term
                  of the Lord & Taylor operating covenant and Lender shall be
                  satisfied that Permitted Transferee will be able to meet all
                  of its obligations under the new store lease or (2) if the
                  Acquiring Party is another Permitted Transferee, such
                  Permitted Transferee shall have agreed (pursuant to a recorded
                  instrument benefiting Borrower, Lender and their respective
                  successors and assigns) to continuously operate a store under
                  the name of such Permitted Transferee for a period at least
                  equal to the unexpired term of the Lord & Taylor operating
                  covenant and Lender shall be satisfied that all pre-conditions
                  to such Permitted Transferee opening and operating its store
                  shall be met. It is acknowledged and agreed that Federated
                  Department Stores Inc., Nordstrom, Inc., Saks Incorporated and
                  Neiman Marcus Group, Inc. shall each be a tenant acceptable to
                  Lender for the foregoing purposes. In connection with the
                  acquisition by a Permitted Transferee of the Lord & Taylor
                  Property and termination of the Lord & Taylor operating
                  covenant, the Permitted Transferee shall have the right to (1)
                  expand the store building on the Lord & Taylor Property, (2)
                  encumber the cross-hatched portion of the Property shown on
                  the drawing attached hereto as Exhibit A with an easement
                  reasonably acceptable to Lender, which determination shall not
                  be unreasonably delayed, for the purpose of constructing and
                  maintaining a portion of such enlarged store building or such
                  portion of the Property and (3) have the lien of the Security
                  Instrument subordinated to such easement, so long as (a) the
                  total square footage of the expanded building does not exceed
                  225,000 square feet and (b) as reasonably determined by
                  Lender, which determination shall not be unreasonably delayed,
                  the expanded store building will not (I) encompass any
                  currently improved portions of the Property, (II) adversely
                  affect the use, cash flow, value, visibility or access to the
                  Property, (III) cause Borrower to be in default of any leases,
                  easements or encumbrances upon the Property (after
                  consideration of all consents and waivers obtained from all
                  other parties thereto) or in violation of any applicable
                  zoning, and use or building code restrictions and (IV) expose
                  Borrower to any present or future increased liability under
                  leases, easements, or encumbrances upon the Property
                  (including, but not limited to, with respect to having to
                  construct additional parking pursuant to the ROA in connection
                  with a Strawbridge's expansion or pursuant to any lease to
                  maintain required parking ratios) or, if Borrower is exposed
                  to present or future increased liability under leases,
                  easements or encumbrances upon the Property, Borrower shall
                  have deposited with Lender cash or a Letter of Credit
                  (hereinafter defined) in an amount reasonably estimated by







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                  Lender to cover any such increased exposure, which cash or
                  Letter of Credit shall be held by Lender as security for the
                  Debt until such time as the potential liability shall be
                  removed (for example, by the construction of any possible
                  additional parking), at which time, provided no Event of
                  Default shall exist, such cash or Letter of Credit shall be
                  returned to Borrower. If, instead of a Permitted Transferee
                  acquiring the Lord & Taylor Property and terminating the Lord
                  & Taylor operating covenants, Borrower and May wish to allow
                  for expansion of the existing Lord & Taylor store, Borrower
                  and May may do so and receive the benefit of the easement and
                  subordination referred to in the preceding sentence, provided
                  (i) Lord & Taylor's existing operating covenant shall remain
                  in effect with respect to the expanded store, (ii) Borrower
                  shall not have any obligation with respect to such expansion,
                  (iii) Lender shall be satisfied that all obligations to be
                  fulfilled by any party other than May with respect to such
                  expansion shall be met, and (iv) the conditions set forth in
                  (a) and (b) of the preceding sentence shall have been met.
                  Lender shall be entitled to reimbursement for all
                  out-of-pocket costs and expenses (including, but not limited
                  to, reasonable attorneys' fees and expenses) and to assess a
                  reasonable administrative fee in connection with any request
                  for approval made by Borrower under this Section 2.

                  Borrower shall not be required to maintain on deposit with
                  Lender cash or a Letter of Credit in accordance with clause
                  (b)(iv) above during periods in which (1) PREIT Associates,
                  L.P. shall have guaranteed payment and performance when due of
                  the related increased liabilities of Borrower in a manner
                  acceptable to Lender and (2) the long term unsecured debt of
                  Pennsylvania Real Estate Investment Trust ("PREIT") shall be
                  rated at least investment grade by S&P (hereinafter defined)
                  and Moody's (hereinafter defined) and PREIT shall be the
                  general partner of PREIT Associates, L.P.

            3.    Borrower shall have the right to terminate the current leases
                  with United Artists Theatre Circuit, Inc. ("UA"), Van's, Inc.
                  ("Vans") and/or Venitor Group Specialty, Inc. ("Foot Locker")
                  (each, an "Existing Lease") so long as (i) a new lease or new
                  leases (each, a "New Leases") shall have been entered into
                  with replacement tenants of the same or better credit for the
                  entire space covered by the Existing Lease (each, an "Existing
                  Lease") in accordance with the Security Instrument, (ii)
                  Lender shall be satisfied that the debt service coverage ratio
                  for the Loan will not be less than 1.25x once the tenants
                  under the New Leases are open and paying rent, (iii) Borrower
                  shall have deposited cash or a Letter of Credit (hereinafter
                  defined) with Lender in an amount equal to the estimated costs
                  of all landlord obligations under the New Leases, as
                  reasonably determined by Lender, and (iv) at all times that
                  the Rent Differential (hereinafter defined) shall be greater
                  than zero, Borrower shall have deposited with Lender cash or a
                  Letter of Credit in an amount equal to twelve times the Rent
                  Differential. The amount deposited under clause (iv) will be








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                  returned to Borrower once the aggregate base rent paid by all
                  tenants of the Property with unexpired terms of at least one
                  year ("Aggregate Base Rent") is at or above $6,855,286 and
                  shall not be required if the Aggregate Base Rent as of the
                  date of the satisfaction of the conditions in (i)-(iii) above
                  is at or above $6,855,286. As used herein, term "Rent
                  Differential" shall mean, as of any date of determination, an
                  amount equal to the aggregate base rent payable under each
                  Existing Lease that has been terminated at the time of its
                  termination minus the base rent payable under each New Lease.

            4.    Borrower agrees that (i) it shall not assert any claim, and
                  that it shall not permit, allow or suffer the pursuit of any
                  claim by any other Person, against UA for past due "Center
                  Expenses" (as defined in UA's Lease) or current or future
                  Center Expenses of the type objected to by UA in its letter to
                  The Rouse Company dated as of February 28, 2003 (the "February
                  28 Letter") or for any other past due rents or charges under
                  UA's Lease that could form the basis for a claim by UA that it
                  has the right to reject its Lease on the grounds alleged in
                  the February 28 Letter, (ii) that it shall expressly waive any
                  such claims in connection with any attempt by UA to reject its
                  Lease and (iii) that, if obligated under UA's Lease, it shall
                  promptly perform at its sole expense the roof repair referred
                  to in the February 28 Letter. Borrower shall enforce all
                  obligations of UA under UA's Lease (except for the matters
                  that Borrower has agreed not to pursue in accordance with the
                  preceding sentence) including, but not limited to, by using
                  its best efforts to contest, beyond any applicable appeal, any
                  attempt by UA to reject UA's Lease pursuant to its Bankruptcy
                  Case entitled "In re: United Artists Theatre Company, et.
                  al.", Case No. 00-3514, United States Bankruptcy Court for the
                  District of Delaware and/or on the factors enumerated in the
                  February 28 Letter. Borrower's obligations under the preceding
                  sentence shall terminate upon the earlier to occur of (i) such
                  time that the Aggregate Base Rent (exclusive of any rent
                  payable by UA) shall be at or above $6,855,286 and (ii) UA's
                  rejection of UA's Lease in any future bankruptcy case
                  involving UA as debtor.

            5.    All cash deposited and Letters of Credit delivered under this
                  Agreement shall be security for the payment of the Debt.
                  Lender shall have the right, at its option, to draw on any
                  Letter of Credit and to apply all or any part of the proceeds
                  thereof to the payment of the Debt in such order, proportion
                  or priority as Lender may determine. In addition to any other
                  right Lender may have to draw upon a Letter of Credit pursuant
                  to the terms and conditions of this agreement, Lender shall
                  have the additional rights to draw in full any Letter of
                  Credit: (a) with respect to any evergreen Letter of Credit, if
                  Lender has received a notice from the issuing bank that the
                  Letter of Credit will not be renewed and a substitute Letter
                  of Credit is not provided at least thirty (30) days prior to
                  the date on which the outstanding Letter of Credit is
                  scheduled to expire; (b) with respect to any Letter of Credit
                  with a stated expiration date, if Lender has not received a
                  notice from the issuing bank that it has renewed the Letter of
                  Credit at least thirty (30) days prior to the date on which
                  such Letter of Credit is scheduled to expire and a substitute








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                  Letter of Credit is not provided at least thirty (30) days
                  prior to the date on which the outstanding Letter of Credit is
                  scheduled to expire; (c) upon receipt of notice from the
                  issuing bank that the Letter of Credit will be terminated
                  (except if the termination of such Letter of Credit is
                  permitted pursuant to the terms and conditions of this
                  Agreement or a substitute Letter of Credit is provided); or
                  (d) if Lender has received notice that the bank issuing the
                  Letter of Credit shall cease to be an Eligible Institution and
                  Borrower has not, within thirty (30) days after notice
                  thereof, either (A) obtained a new Letter of Credit with an
                  Eligible Institution or (B) if after a Securitization,
                  delivered to Lender a letter from each Rating Agency in form
                  acceptable to Lender (a "Rating Agency Confirmation") stating
                  that the credit rating of the Securities will not be
                  qualified, downgraded or withdrawn if such Letter of Credit is
                  not replaced with a Letter of Credit issued by an Eligible
                  Institution. Lender shall hold the proceeds of such Letter of
                  Credit for the same purpose for which the Letter of Credit was
                  obtained by Borrower. Notwithstanding anything to the contrary
                  contained in the above, Lender is not obligated to draw any
                  Letter of Credit and shall not be liable for any losses
                  sustained by Borrower due to the insolvency of the bank
                  issuing the Letter of Credit if Lender has not drawn the
                  Letter of Credit, and Borrower acknowledges and agrees that an
                  Event of Default shall occur if Lender is not at any time in
                  possession of cash or an unexpired Letter of Credit in the
                  amounts required by clauses (iii) and (iv) of Section 3
                  hereof.

                  As used herein, the term "Letter of Credit" shall mean an
                  irrevocable, unconditional, transferable, clean sight draft
                  letter of credit acceptable to Lender (which shall have a term
                  of one (1) year, be an evergreen letter of credit or shall not
                  expire until at least thirty (30) Business Days after the
                  Maturity Date) in favor of Lender and entitling Lender to draw
                  thereon in New York, New York, issued by a domestic Eligible
                  Institution or the U.S. agency or branch of a foreign Eligible
                  Institution. If at any time the bank issuing any such Letter
                  of Credit shall cease to be an Eligible Institution, Lender
                  shall send notice of same to Borrower and Borrower shall have
                  thirty (30) days within which to either (i) obtain a new
                  Letter of Credit with an Eligible Institution (unless, if such
                  event occurs prior to a Securitization, Lender waives such
                  obligation or (ii) if such event occurs after a
                  Securitization, deliver to Lender a Rating Agency Confirmation
                  stating that the credit rating of the Securities will not be
                  qualified, downgraded or withdrawn if such Letter of Credit is
                  not replaced with a Letter of Credit issued by an Eligible
                  Institution. If a Rating Agency Confirmation or a new Letter
                  of Credit issued by an Eligible Institution has not been
                  delivered to Lender within such thirty (30) day period, or if
                  any Letter of Credit has not been renewed or extended at least
                  thirty (30) days prior to its expiration date, then Lender
                  shall have the right immediately to draw down the same in full
                  and hold the proceeds of such draw in accordance with the
                  applicable provisions hereof, and, upon the receipt by Lender
                  of 100% of the proceeds of such draw, Borrower's obligation to
                  obtain such new Letter of Credit with an Eligible Institution
                  or a Rating Agency Confirmation shall be deemed satisfied.
                  Under no circumstances shall Borrower have any reimbursement
                  or other obligation with respect to any Letter of Credit.








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                  As used herein, the term "Eligible Institution" shall mean a
                  depository institution or trust company, insured by the
                  Federal Deposit Insurance Corporation, (a) the short term
                  unsecured debt obligations or commercial paper of which are
                  rated at least A 1+ by Standard & Poor's Ratings Services, a
                  division of McGraw Hill, Inc. ("S&P"), P 1 by Moody's
                  Investors Service, Inc. ("Moody's") and F 1+ by Fitch, Inc.
                  ("Fitch") in the case of accounts in which funds are held for
                  thirty (30) days or less, or (b) the long term unsecured debt
                  obligations of which are rated at least "AA" by Fitch and S&P
                  and "Aa2" by Moody's in the case of accounts in which funds
                  are held for more than thirty (30) days.


                  [Remainder of Page Intentionally Left Blank]




























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            6.    The terms and conditions of this side letter agreement shall
                  be deemed to be terms and conditions of the Security
                  Instrument as if such terms and conditions were more fully set
                  forth therein.



                               Sincerely,

                               MOORESTOWN MALL LLC,
                               a Delaware limited liability company

                               By: PR MOORESTOWN LIMITED PARTNERSHIP,
                                   its sole member

                                   By: PR MOORESTOWN LLC,
                                       its general partner

                                       By: PREIT ASSOCIATES, L.P.,
                                           its sole member

                                           By: PENNSYLVANIA REAL ESTATE
                                               INVESTMENT TRUST,
                                               its general partner

                                               By: Bruce Goldman
                                                   -----------------------------
                                                   Name:  Bruce Goldman
                                                   Title: Executive Vice
                                                          President and General
                                                          Counsel