Document:

<PAGE>   1

                                                                   EXHIBIT 10.90

                       ASSIGNMENT OF PARTNERSHIP INTEREST

         THIS ASSIGNMENT OF PARTNERSHIP INTEREST (this "Assignment") is made and
entered into as of, although not necessarily on, the 1st day of October, 2000
(the "Effective Date"), by and between Capital Senior Living Properties, Inc., a
Texas corporation, (hereinafter called "Assignor") and Triad Senior Living III,
L.P., a Texas limited partnership, (hereinafter called "Assignee");

                                   WITNESSETH:

         WHEREAS, Assignee is desirous of redeeming eighteen percent (18%) of
the nineteen percent (19%) limited partnership interest in Triad Senior Living
III, L.P. (hereinafter the "Partnership") owned by Assignor (hereinafter the
redeemed amount is called the "Partnership Interest"); and

         WHEREAS, Assignor is agreeable to transfer the Partnership Interest to
Assignee and thereby retain a one percent (1%) limited partnership interest in
the Partnership; and

         WHEREAS, the partners are in agreement regarding said redemption;

         NOW, THEREFORE, for and in consideration of One Hundred Thirty-Five
Thousand Seventy-Five and No/100 Dollars ($135,075.00) and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto do hereby agree as follows:

         1.       ASSIGNMENT OF PARTNERSHIP INTEREST. Assignor hereby assigns to
                  Assignee, and Assignee hereby accepts from Assignor, the
                  Partnership Interest, including but not limited to all right,
                  title and interest represented by the Partnership Interest in
                  and to the properties (real and personal), capital, cash flow
                  distributions, profits and losses of the Partnership. Assignor
                  hereby represents and warrants to Assignee that it has not
                  heretofore sold, assigned, pledged or otherwise disposed of
                  the Partnership Interest. Assignor further represents and
                  warrants that it has good and valid legal title to the
                  Partnership Interest. After the Assignment, the effective
                  Partnership Interests shall be: Triad Partners III, Inc. - GP
                  - 1.2%, Triad Partners III, Inc. - LP - 97.6%, and Capital
                  Senior Living Properties, Inc. - LP - 1.2%.

         2.       EFFECTIVE DATE. From and after the Effective Date, that
                  portion of the net profits or net losses and cash flow
                  (including all cash flow to which Assignee may be entitled on
                  the Effective Date) of the Partnership allocable to the
                  Partnership Interest shall be credited, charged or
                  distributed, as the case may be, to Assignee and not to
                  Assignor.

         3.       FUTURE COOPERATION ON SUBSEQUENT DOCUMENTS. Assignor and
                  Assignee mutually agree to cooperate at all times from and
                  after the date hereof with respect to the supplying of any
                  information requested by the other regarding any of the
                  matters described in this Assignment, and each agrees to
                  execute such further deeds, bills of sale, assignments,
                  amendments to the partnership agreement of the Partnership, or
                  other such documents as may be reasonably requested and
                  appropriate for the purpose of giving effect to, evidencing or
                  giving notice of the transactions undertaken hereby.

         4.       SUCCESSORS AND ASSIGNS. This Assignment shall be binding upon,
                  and shall inure to the benefit of, the parties hereto and
                  their heirs, legal representatives, successors and assigns.

         5.       SURVIVAL OF REPRESENTATIONS. The representations, warranties,
                  covenants and agreements of the parties contained in the
                  Assignment shall survive the consummation of the transactions
                  contemplated hereby.

         6.       MODIFICATION AND WAIVER. No supplement, modification, waiver
                  or termination of this Assignment or any provisions hereof
                  shall be binding unless executed in

                                       1

<PAGE>   2

                  writing by the parties to be bound thereby. No waiver of any
                  of the provisions of this Assignment shall constitute a waiver
                  of any other provision (whether or not similar), nor shall
                  such waiver constitute a continuing waiver unless otherwise
                  expressly provided.

         7.       GOVERNING LAW. This Assignment is being executed and is
                  intended to be performed in the State of Texas and shall be
                  construed and enforced in accordance with the laws of the
                  State of Texas.

         8.       COUNTERPARTS. This Assignment may be executed by the parties
                  hereto individually or in any combination, in one or more
                  counterparts, each of which shall be original and all of which
                  shall together constitute one and the same agreement.

IN WITNESS WHEREOF, this Assignment is executed as of the day and year first
above written.

                            ASSIGNOR:

                            CAPITAL SENIOR LIVING PROPERTIES,
                            INC., A TEXAS CORPORATION

                            By: /s/ LAWRENCE A. COHEN
                               ------------------------------------------------
                               Lawrence A. Cohen, Chief Executive Officer

                            ASSIGNEE:

                            TRIAD SENIOR LIVING III, L.P., A TEXAS
                            LIMITED PARTNERSHIP

                            By:  Triad Partners III, Inc., Its General Partner

                            By: /s/ BLAKE N. FAIL
                               ------------------------------------------------
                               Blake N. Fail, President

                                       2<PAGE>   1

                                                                   EXHIBIT 10.91

                       ASSIGNMENT OF PARTNERSHIP INTEREST

         THIS ASSIGNMENT OF PARTNERSHIP INTEREST (this "Assignment") is made and
entered into as of, although not necessarily on, the 1st day of October, 2000
(the "Effective Date"), by and between Capital Senior Living Properties, Inc., a
Texas corporation, (hereinafter called "Assignor") and Triad Senior Living V,
L.P., a Texas limited partnership, (hereinafter called "Assignee");

                                   WITNESSETH:

         WHEREAS, Assignee is desirous of redeeming nine percent (9%) of the ten
percent (10%) limited partnership interest in Triad Senior Living V, L.P.
(hereinafter the "Partnership") owned by Assignor (hereinafter the redeemed
amount is called the "Partnership Interest"); and

         WHEREAS, Assignor is agreeable to transfer the Partnership Interest to
Assignee and thereby retain a one percent (1%) limited partnership interest in
the Partnership; and

         WHEREAS, the partners are in agreement regarding said redemption;

         NOW, THEREFORE, for and in consideration of One Thousand and No/100
Dollars ($1,000.00) and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto do hereby agree
as follows:

         1.       ASSIGNMENT OF PARTNERSHIP INTEREST. Assignor hereby assigns to
                  Assignee, and Assignee hereby accepts from Assignor, the
                  Partnership Interest, including but not limited to all right,
                  title and interest represented by the Partnership Interest in
                  and to the properties (real and personal), capital, cash flow
                  distributions, profits and losses of the Partnership. Assignor
                  hereby represents and warrants to Assignee that it has not
                  heretofore sold, assigned, pledged or otherwise disposed of
                  the Partnership Interest. Assignor further represents and
                  warrants that it has good and valid legal title to the
                  Partnership Interest. After the Assignment, the effective
                  Partnership Interests shall be: Triad Partners V, L.L.C. - GP
                  - 1.1%, Triad Partners V, L.L.C. - LP - 97.8%, and Capital
                  Senior Living Properties, Inc. - LP - 1.1%.

         2.       EFFECTIVE DATE. From and after the Effective Date, that
                  portion of the net profits or net losses and cash flow
                  (including all cash flow to which Assignee may be entitled on
                  the Effective Date) of the Partnership allocable to the
                  Partnership Interest shall be credited, charged or
                  distributed, as the case may be, to Assignee and not to
                  Assignor.

         3.       FUTURE COOPERATION ON SUBSEQUENT DOCUMENTS. Assignor and
                  Assignee mutually agree to cooperate at all times from and
                  after the date hereof with respect to the supplying of any
                  information requested by the other regarding any of the
                  matters described in this Assignment, and each agrees to
                  execute such further deeds, bills of sale, assignments,
                  amendments to the partnership agreement of the Partnership, or
                  other such documents as may be reasonably requested and
                  appropriate for the purpose of giving effect to, evidencing or
                  giving notice of the transactions undertaken hereby.

         4.       SUCCESSORS AND ASSIGNS. This Assignment shall be binding upon,
                  and shall inure to the benefit of, the parties hereto and
                  their heirs, legal representatives, successors and assigns.

         5.       SURVIVAL OF REPRESENTATIONS. The representations, warranties,
                  covenants and agreements of the parties contained in the
                  Assignment shall survive the consummation of the transactions
                  contemplated hereby.

         6.       MODIFICATION AND WAIVER. No supplement, modification, waiver
                  or termination of this Assignment or any provisions hereof
                  shall be binding unless executed in writing by the parties to
                  be bound thereby. No waiver of any of the provisions of

                                       1

<PAGE>   2

                  this Assignment shall constitute a waiver of any other
                  provision (whether or not similar), nor shall such waiver
                  constitute a continuing waiver unless otherwise expressly
                  provided.

         7.       GOVERNING LAW. This Assignment is being executed and is
                  intended to be performed in the State of Texas and shall be
                  construed and enforced in accordance with the laws of the
                  State of Texas.

         8.       COUNTERPARTS. This Assignment may be executed by the parties
                  hereto individually or in any combination, in one or more
                  counterparts, each of which shall be original and all of which
                  shall together constitute one and the same agreement.

IN WITNESS WHEREOF, this Assignment is executed as of the day and year first
above written.

                              ASSIGNOR:

                              CAPITAL SENIOR LIVING PROPERTIES,
                              INC., A TEXAS CORPORATION

                              By: /s/ LAWRENCE A. COHEN
                                  ---------------------------------------------
                                  Lawrence A. Cohen, Chief Executive Officer

                              ASSIGNEE:

                              TRIAD SENIOR LIVING V, L.P., A TEXAS
                              LIMITED PARTNERSHIP

                              By:  Triad Partners V, L.L.C., Its General Partner

                              By: /s/ BLAKE N. FAIL
                                  ---------------------------------------------
                                  Blake N. Fail, President

                                       2

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00021-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00021-of-00352.parquet"}]]