Document:

<PAGE>   1
                                                                 EXHIBIT 10k
December 2, 1999

Mr. Brent Buck
Murray Income Properties
299 South 9th Street
Suite 203
Oxford, MS  38655

RE:      Tower Place Festival
         Management Contract Renewal

Dear Brent:

Our current management agreement, dated December 12, 1994 and renewed each year
in letter agreements between Murray Income Properties and CK Retail Charlotte
Overhead Limited Partnership is in the process of expiring. It is our desire to
renew this management contract upon the same terms and conditions as the
previous management, dated December 12, 1994, with the exception that the term
shall now expire on December 31, 2000. I have attached as Exhibit "A", a copy of
the December 12, 1994 management agreement and would like you to indicate your
approval of the renewal and the new expiration date by signing this renewal
agreement in the appropriate space below.

It has been a pleasure to be the property manager/leasing agent at Tower Place
Festival and we look forward to continuing our relationship as your management
agent in the future.

RENEWAL AGREEMENT ACCEPTED:

<TABLE>
<S>                                         <C>
CK Charlotte Overhead Limited Partnership   Tower Place Joint Venture
a North Carolina Limited Partnership        By: Murray Income Properties I, LTD.
By:  Childress Klein Retail-Charlotte           a Texas Ltd. Partnership, Joint Venturer
     #2, Inc., Its General Partner          By: Murray Realty Investors VIII, Inc.
                                                a Texas Corp., General Partner

BY:  /s/ David Haggart                      By: /s/ Brent Buck
     ------------------------------             -----------------------------------------
     David Haggart, Vice President              Brent Buck, Executive Vice President

Attest/Witness:                             Witness:

   /s/ Wendy Roy                            /s/ Joni Armstrong
-----------------------------------         ------------------

Title:  Secretary                           Name:  Joni Armstrong

(Corporate Seal)
</TABLE><PAGE>   1
                                                                 EXHIBIT 10L
STATE OF TENNESSEE
COUNTY OF SHELBY

                      MODIFICATION TO MANAGEMENT AGREEMENT

         This Modification to management Agreement is made and entered into this
15th day of December, 1999, by and between Murray Income Properties, II, LTD, a
Texas Limited Partnership ("Owner") and TC Tennessee, Inc., a Delaware
Corporation ("Operator").

                                   WITNESSETH:

         Whereas, Owner and Operator entered into that certain Management
Agreement for the managing and operating of certain improved real property,
("Project") commonly known as Germantown Collection, dated August 8, 1990 and
extended December 30, 1993.

         Whereas, the Owner and Operator desire to modify and amend the
Management Agreement;

         Now, therefore, for and in consideration of the Modification to
Management Agreement, the sum of One and 00/100 Dollars ($1.00) in hand paid by
Owner to Operator, the mutual agreements herein contained and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto do agree as follows:

         1.    Owner and Operator acknowledge and agree the management Agreement
               shall be extended to expire on December 31, 2000.

         2.    All other terms and conditions of the Management Agreement not
               specifically amended by this Modification to Management
               Agreement, are hereby deemed to remain in full force and effect.

         IN WITNESS WHEREOF, the parties have executed the foregoing
Modification as of the day and year written above.

Owner:                                        Operator:

Murray Income Properties, II, LTD             TC Tennessee, Inc., a Delaware
                                              corporation
BY:    Murray Realty Investors, IX, Inc.

BY:    /s/ Brent Buck                         BY:    /s/ Vince Dunavant
       -----------------------------------           --------------------------
       Brent Buck                                    Vince Dunavant

Title: Executive Vice President               Title: Senior Vice-President
       -----------------------------------           --------------------------<PAGE>   1
                                                                     EXHIBIT 10M

                   EXTENSION OF PROPERTY MANAGEMENT AGREEMENT

     The Extension of Property Management Agreement entered into this 15th day
     of December, 1999 by and between Murray Income Properties II, Ltd., a Texas
     limited partnership (hereinafter called the "Owner") and Brookside
     Properties, Inc., (hereinafter called the "Agent").

                                    RECITALS:

1.        Owner and Agent are parties to that certain Property Management
          Agreement dated March 1, 1991 covering the Paddock Place Shopping
          Center, located at the Southwest corner of White Bridge Road and
          Brookwood Terrace, Nashville, Tennessee.

2.        The term of the aforesaid Property Management Agreement expired on
          February 28, 1994, was extended with an expiration date of February
          28, 1995, was extended with an expiration date of February 29, 1996,
          was extended with an expiration date of February 28, 1997, was
          extended with an expiration date of February 28, 1998, was extended
          with an expiration date of December 31, 1998, and was extended with an
          expiration date of December 31, 1999. The parties thereto are mutually
          desirous of extending the term of the Property Management Agreement.

NOW, THEREFORE, it is hereby agreed as follows:

1.        The expiration date of the Property Management Agreement shall be
          midnight, December 31, 2000

2.        All other terms and conditions of the Property Management Agreement
          shall remain unchanged and in full force and effect.

IN WITNESS WHEREOF, the parties hereto have executed this document the day and
year first above written.

WITNESS                             BROOKSIDE PROPERTIES, INC.

   /s/ Charles H. Warfield, Jr.     /s/ W. Miles Warfield
-------------------------------     -------------------------------------
Charles H. Warfield, Jr.            W. Miles Warfield

                                    MURRAY INCOME PROPERTIES II, LTD
                                    a Texas Limited Partnership by
                                    Murray Realty Investors IX, Inc. a
                                    Texas Corporation, its General Partners
                                     (Owners)

                                    /s/ Brent Buck
-------------------------------     -------------------------------------
                                    By: Brent Buck, Executive Vice President<PAGE>   1
                                                                Exhibit 10.15(a)

                                               January 11, 2000

Mr. Edward A. Brennan
400 North Michigan Avenue
Suite 400
Chicago IL   60611

Dear Ed:

         For calendar year 2000, you've elected to defer the retainers and fees
that would otherwise be paid for your service on the Board of Directors (and
related Committees) of AMR Corporation.

         In accordance with our discussion of this date, you have elected to
continue the deferral arrangement currently in effect (see the attached
agreement).

         Please sign this letter below evidencing your intent to continue the
current deferral arrangement and return one original (two originals are
enclosed) to me.

         Thank you for your cooperation and if there are questions please let me
know.

                                               Very truly yours,

                                               Charles D. MarLett
                                               Corporate Secretary

DEFERRAL OF 2000 FEES AND RETAINERS TO BE IN ACCORDANCE WITH JUNE 2, 1998
LETTER:

AGREED:
       ------------------------------
       EDWARD A. BRENNAN

Attachment<PAGE>   1
                                                                   Exhibit 10.20

                                                  January 12, 2000

Mr. Armando M. Codina
Chairman
Codina Group, Inc.
Two Alhambra Plaza, PH2
Coral Gables, FL 33134

Dear Armando:

                  This will confirm the following agreement relating to the
deferral of, and payment of, your directors' fees in 2000:

                  1. All directors' fees and retainers ("Fees") payable to you
in connection with your service on the boards of directors (including committees
of such boards) of AMR Corporation and American Airlines, Inc. for the period
January 1, 2000, through December 31, 2000, will be deferred and paid to you in
accordance with the following:

                  2. Fees will be converted to Stock Equivalent Units in
accordance with the Directors' Stock Equivalent Purchase Plan, a copy of which
is attached hereto as Exhibit A.

                  3. On or before January 31, 2010, all the Stock Equivalent
Units will be converted to cash and paid to you by multiplying the number of
Stock Equivalent Units as of December 31, 2009, by the arithmetic mean of the
high and low of AMR stock ("fair market value") during December 2009.

                  4. AMR's obligation to make payments pursuant to paragraph 3
hereof will not be released or modified by reason of your death. In such event,
the number of Stock Equivalent Units as of your date of death will be multiplied
by the fair market value of AMR stock during the calendar month immediately
preceding your death, and the amount paid to Margarita Codina.

<PAGE>   2

                  If the foregoing is satisfactory to you, please indicate by
signing one of the originals (two are enclosed) and returning it to me.

                                                 Very truly yours,

                                                 Charles D. MarLett
                                                 Corporate Secretary

Accepted and agreed:

-----------------------------------------
Armando M. Codina

-----------------------------------------
Date

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