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                                                                  Exhibit 10.123

                          ASSIGNMENT AND ASSUMPTION OF
                         AGREEMENT FOR PURCHASE AND SALE

     THIS ASSIGNMENT AND ASSUMPTION OF AGREEMENT FOR PURCHASE AND SALE (this
"Assignment") is made and entered into as of this 28th day of April, 2004, by
and between INLAND REAL ESTATE ACQUISITIONS, INC., an Illinois corporation, as
Assignor ("Assignor"), and INLAND WESTERN SAN ANTONIO MILITARY DRIVE LIMITED
PARTNERSHIP, an Illinois limited partnership, as Assignee ("Assignee").

                                    RECITALS:

     A.   Assignor previously has executed and entered into that certain
Purchase and Sale Agreement dated as of February 19, 2004, with XXL One, Ltd.
(as amended, the "Agreement").

     B.   Assignor desires to assign all of its right, title and interest in, to
and under the Agreement to Assignee, and Assignee desires to accept such
assignment and assumes all of Assignor's duties and obligations under the
Agreement that arise and accrue from and after the date of this Assignment, all
upon and subject to the terms and provisions of this Assignment.

                                   AGREEMENT:

     NOW, THEREFORE, in consideration of the foregoing Recitals, the mutual
agreement of the parties hereto and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
hereby agree as follows:

     1.   INCORPORATION OF RECITALS. The foregoing Recitals are, by this
reference, incorporated into the body of this Assignment as if the same had been
set forth in the body of this Assignment in their entirety.

     2.   ASSIGNMENT. Assignor hereby assigns, conveys, transfers and sets over
to Assignee all of Assignor's right, title and interest in, to and under the
Agreement.

     3.   ACCEPTANCE OF ASSIGNMENT AND ASSUMPTION. Assignee hereby accepts the
foregoing assignment and hereby assumes, and agrees to perform, all of
Assignor's duties and obligations under the Agreement that arise and accrue from
and after the date of this Assignment.

     4.   SEVERABILITY. If any provision of this Assignment or the application
thereof to any person or circumstance is or shall be deemed illegal, invalid or
unenforceable, the remaining provisions of this Assignment shall remain in full
force and effect and this Assignment shall be interpreted as if such illegal,
invalid or unenforceable provision did not exist.

     5.   BINDING EFFECT. Each provision of this Assignment shall extend to and
shall bind and inure to the benefit of Assignor and Assignee and their
respective heirs, legal representatives, successors and assigns.

     6.   TIME OF ESSENCE. Time is of the essence of this Assignment and each
provision hereof.

     7.   ENTIRE AGREEMENT. This Assignment contains the entire agreement of
Assignor and Assignee with respect to subject matter hereof. No prior agreements
or understandings with respect to the subject matter hereof shall be valid or of
any force or effect.

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     8.   GOVERNING LAW. This Assignment shall be governed by, and construed in
accordance with, the laws of the State of Illinois.

     9.   COUNTERPARTS. This Assignment may be executed in separate
counterparts, each of which shall constitute an original copy hereof, but all of
which shall constitute but one and the same agreement.

     IN WITNESS WHEREOF, Assignor and Assignee have executed and delivered this
Assignment as of the date and year first written above.

                                     ASSIGNOR:

                                     INLAND REAL ESTATE ACQUISITIONS, INC.,
                                     an Illinois corporation

                                     By:  /s/ Jason A. Lazarus
                                        ----------------------------------------
                                          Jason A. Lazarus
                                          Authorized Signatory

                                     ASSIGNEE:

                                     INLAND WESTERN SAN ANTONIO
                                     MILITARY DRIVE LIMITED PARTNERSHIP,
                                     an Illinois limited partnership

                                     By:  INLAND WESTERN SAN ANTONIO MILITARY
                                          DRIVE GP, L.L.C., its General Partner

                                          By:  INLAND WESTERN RETAIL REAL ESTATE
                                               TRUST, INC., its Sole Member

                                               By:  /s/ Valerie Medina
                                                  ------------------------------
                                                    Name:  Valerie Medina
                                                         -----------------------
                                                    Its:  Asst. Secretary
                                                        ------------------------<Page>

                                                                  Exhibit 10.124

                             POST CLOSING AGREEMENT

     THIS POST CLOSING AGREEMENT (this Agreement@) is made and entered into as
of the 28th day of April, 2004, by and between INLAND WESTERN SAN ANTONIO
MILITARY DRIVE LIMITED PARTNERSHIP, an Illinois limited partnership
("Purchaser"), and XXL ONE, LTD., a Texas limited partnership ("Seller"), in
connection with the acquisition by Purchaser of that certain property commonly
known as Alison's Corner Shopping Center, San Antonio, Texas (the AProperty@).

     WHEREAS, Purchaser is acquiring the Property from Seller (the
"Transaction").

     WHEREAS, in order to proceed with and consummate such acquisition and as a
condition to closing the Transaction, Purchaser requires that Seller agree to
the obligations set forth below, which are to be performed after such closing.

     NOW, THEREFORE, for good and valuable consideration including the mutual
promises contained herein, the parties hereto agree as follows:

     1.   WARRANTIES. Seller's right, title and interest in, to and under the
warranties set forth on Exhibit A attached hereto and made a part hereof
(individually, a "Warranty", and collectively, the "Warranties") were not
assigned to Purchaser at the closing of the Transaction because such Warranties
may not be assigned or transferred without the prior consent of the Warranty
issuer. From and after the date of this Agreement, Seller shall use its best
efforts to obtain the aforementioned consents (upon the receipt of which Seller
shall assign such Warranty to Purchaser) or have the Warranties reissued in the
name of Purchaser. Seller shall be responsible for the payment of any and all
fees and costs in connection with obtaining any such consents or the reissuance
of any of the Warranties. Seller shall, until the first to occur of (i) the
expiration of an applicable Warranty and (ii) the date that the applicable
Warranty is assigned to Purchaser (with any and all required consents) or
reissued in the name of Purchaser, cooperate with Purchaser, at no cost to
Seller, with respect to the enforcement of the terms and provisions of, and any
and all claims under, any Warranty.

     2.   FURTHER ASSURANCES. Seller and Purchaser agree to cooperate with each
other following the closing to confirm any matter and execute any document
reasonably required by the other party in furthering of the closing.

     3.   MISCELLANEOUS. This Agreement shall be interpreted and enforced in
accordance with the internal laws of the State of Texas. The invalidity or
unenforceability of any provision of this Agreement shall not affect, modify or
impair the validity and enforceability of all other provisions of this
Agreement. This Agreement shall be binding on and shall inure to the benefit of
the parties hereto and their representatives, heirs, legatees, successors, and
assigns; provided, however, that Seller shall have no right whatsoever to assign
its interest under this Agreement and any such attempted assignment shall
automatically be null and void and of no force and effect, and shall be deemed a
breach by Seller of its obligations hereunder. No failure or delay by Purchaser
in exercising any right, power or privilege under this Agreement shall operate
as a

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waiver thereof, nor shall any single or partial exercise thereof preclude any
other or further exercise thereof or the exercise of any right, power or
privilege hereunder. No change, amendment or modification of this Agreement
shall be binding or enforceable unless in writing and executed by the party to
be bound thereby. The covenants, agreements and indemnification provisions
contained in this Agreement shall be enforceable notwithstanding the closing of
the Transaction. In the event of litigation with respect to any portions of this
Agreement, the prevailing party will be entitled to collect all reasonable legal
fees incurred in connection with such litigation from the non-prevailing party.
Purchaser shall have all remedies available at law and in equity on account of a
default by Seller under this Agreement. Time is of the essence of this Agreement
and the terms hereof. This Agreement may be signed in counterparts.

                         [SIGNATURES ON FOLLOWING PAGE]

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     IN WITNESS WHEREOF, the parties have executed this Post Closing and
Indemnity Agreement effective as of the first date written above.

                           SELLER:

                           XXL ONE, LTD., a Texas limited partnership

                           By:  DEVELOPMENT STRATEGIES TEXAS, INC. its General
                                Partner

                                By:  /s/ David W. Monnich
                                   ------------------------------------
                                     David W. Monnich
                                     President

                           PURCHASER:

                           INLAND WESTERN SAN ANTONIO MILITARY
                           DRIVE LIMITED PARTNERSHIP, an Illinois limited
                           partnership

                           By:  INLAND WESTERN SAN ANTONIO MILITARY DRIVE GP,
                                L.L.C., its General Partner

                                By:  INLAND WESTERN RETAIL REAL ESTATE TRUST,
                                     INC., its Sole Member

                                    By:
                                       --------------------------------
                                         Name:
                                              -------------------------
                                         Its:
                                             --------------------------

                                            3
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     IN WITNESS WHEREOF, the parties have executed this Post Closing and
Indemnity Agreement effective as of the first date written above.

                           SELLER:

                           XXL ONE, LTD., a Texas limited partnership

                           By:  DEVELOPMENT STRATEGIES TEXAS, INC., its General
                                Partner

                                By:
                                   ------------------------------------
                                     David W. Monnich
                                     President

                           PURCHASER:

                           INLAND WESTERN SAN ANTONIO MILITARY
                           DRIVE LIMITED PARTNERSHIP, an Illinois limited
                           partnership

                           By:  INLAND WESTERN SAN ANTONIO MILITARY DRIVE GP,
                                L.L.C., its General Partner

                                By:  INLAND WESTERN RETAIL REAL ESTATE TRUST,
                                     INC., its Sole Member

                                    By:  /s/ Valerie Medina
                                       --------------------------------
                                         Name:  Valerie Medina
                                              -------------------------
                                         Its:  Asst Secretary
                                             --------------------------

                                        3

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                                    EXHIBIT A

                                   WARRANTIES

<Table>
<Caption>
WARRANTY                              PROVIDER                 CONSENT         EXPIRATION
--------------------------    ------------------------    -----------------    ----------
<S>                           <C>                         <C>                   <C>
ROOF (595 SQS)                American Roofing & Metal    NEED CONSENT          6/9/05
                              Co., Inc.

ROOF (59,500 sq.ft.)          OMNOVA Solutions, Inc.      NEED CONSENT          5/28/2018

Unit Model No. LGA180HL2G,    Lennox                      NEED CONSENT FOR      Varies
Serial No. 5603D05436                                     ASSIGNMENT OF THE
                                                          EXTENDED WARRANTY

Unit Model No. LGC156HL1G,    Lennox                      NEED CONSENT FOR      Varies
Serial No. 5603D05461                                     ASSIGNMENT OF THE
                                                          EXTENDED WARRANTY

Unit Model No. LGA210HL2G,    Lennox                      NEED CONSENT FOR      Varies
Serial No. 5603D05465                                     ASSIGNMENT OF THE
                                                          EXTENDED WARRANTY

Unit Model No. LGA102HS3G,    Lennox                      NEED CONSENT FOR      Varies
Serial No. 5603C04950                                     ASSIGNMENT OF THE
                                                          EXTENDED WARRANTY

Unit Model No. LGA120HS2G,    Lennox                      NEED CONSENT FOR      Varies
Serial No. 5603D05639                                     ASSIGNMENT OF THE
                                                          EXTENDED WARRANTY

Unit Model No. LGA042HS2G,    Lennox                      NEED CONSENT FOR      Varies
Serial No. 5603D05848                                     ASSIGNMENT OF THE
                                                          EXTENDED WARRANTY

Unit Model No. LGA060HS2G,    Lennox                      NEED CONSENT FOR      Varies
Serial No. 5603D05822                                     ASSIGNMENT OF THE
                                                          EXTENDED WARRANTY
</Table>

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