Document:

<PAGE>   1

                                                                    EXHIBIT 10.1

                                JOINDER AGREEMENT

     JOINDER AGREEMENT dated as of September 13, 2000, by the undersigned, (the
"Additional Subsidiary Guarantor"), in favor of The Chase Manhattan Bank, as
administrative agent for the Lenders party to the Credit Agreement referred to
below (in such capacity, together with its successors in such capacity, the
"Administrative Agent").

     Lamar Media Corp. (formerly Lamar Advertising Company), a Delaware
corporation (the "Borrower"), and certain of its subsidiaries (collectively, the
"Existing Subsidiary Guarantors" and, together with the Borrower, the "Securing
Parties") are parties to a Credit Agreement dated August 13, 1999 (as modified
and supplemented and in effect from time to time, the "Credit Agreement",
providing, subject to the terms and conditions thereof, for extensions of credit
(by means of loans and letters of credit) to be made by the lenders therein
(collectively, together with any entity that becomes a "Lender" party to the
Credit Agreement after the date hereof as provided therein, the "Lenders" and,
together with Administrative Agent and any successors or assigns of any of the
foregoing, the "Secured Parties") to the Borrower in an aggregate principal or
face amount not exceeding $1,000,000,000 (which, in the circumstances
contemplated by Section 2.01(d) thereof, may be increased to $1,400,000,000). In
addition, the Borrower may from time to time be obligated to one or more of the
Lenders under the Credit Agreement in respect of Hedging Agreements under and as
defined in the Credit Agreement (collectively, the "Hedging Agreements").

     In connection with the Credit Agreement, the Borrower, the Existing
Subsidiary Guarantors and the Administrative Agent are parties to the Pledge
Agreement dated September 15, 1999 (the "Pledge Agreement") pursuant to which
the Securing Parties have, inter alia, granted a security interest in the
Collateral (as defined in the Pledge Agreement) as collateral security for the
Secured Obligations (as so defined). Terms defined in the Pledge Agreement are
used herein as defined therein.

     To induce the Secured Parties to enter into the Credit Agreement, and to
extend credit thereunder and to extend credit to the Borrower under Hedging
Agreements, and for other good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, the Additional Subsidiary
Guarantor has agreed to become a party to the Credit Agreement and the Pledge
Agreement as a "Subsidiary Guarantor" thereunder, and to pledge and grant a
security interest in the Collateral (as defined in the Pledge Agreement).

     Accordingly, the parties hereto agree as follows:

     Section 1. Definitions. Terms defined in the Credit Agreement are used
herein as defined therein.

     Section 2. Joinder to Agreements. Effective upon the execution and delivery
hereof, the Additional Subsidiary Guarantor hereby agrees that it shall become
"Subsidiary Guarantor" under and for all purposes of the Credit Agreement and
the Pledge Agreement with all the rights and obligations of a Subsidiary
Guarantor thereunder. Without limiting the generality of the foregoing, the
Additional Subsidiary Guarantor hereby:

<PAGE>   2

          (i) jointly and severally with the other Subsidiary Guarantors party
     to the Credit Agreement guarantees to each Secured Party and their
     respective successors and assigns the prompt payment in full when due
     (whether at stated maturity, by acceleration or otherwise) of all
     Guaranteed Obligations in the same manner and to the same extent as is
     provided in Article III of the Credit Agreement;

          (ii) pledges and grants the security interests in all right, title and
     interest of the Additional Subsidiary Guarantor in all Collateral (as
     defined in the Pledge Agreement) now owned or hereafter acquired by the
     Additional Subsidiary Guarantor and whether now existing or hereafter
     coming into existence provided for by Article III of the Pledge Agreement
     as collateral security for the Secured Obligations and agrees that Annex 1
     thereof shall be supplemented as provided in Appendix A hereto;

          (iii) makes the representations and warranties set forth in Article IV
     of the Credit Agreement and in Article II of the Pledge Agreement, to the
     extent relating to the Additional Subsidiary Guarantor or to the Pledged
     Equity evidenced by the certificates, if any, identified in Appendix A
     hereto; and

          (iv) submits to the jurisdiction of the courts, and waives jury trial,
     as provided in Sections 10.09 and 10.10 of the Credit Agreement.

     The Additional Subsidiary Guarantor hereby instructs its counsel to deliver
the opinions referred to in Section 6.10(a)(iii) of the Credit Agreement to the
Secured Parties.

                                       2

<PAGE>   3

     IN WITNESS WHEREOF, the Additional Subsidiary Guarantor has caused this
Joinder Agreement to be duly executed and delivered as of the day and year first
above written.

                                       Lamar Ohio Outdoor Corporation
                                       an Ohio Corporation

                                       By: /s/ Keith A. Istre
                                           ----------------------------
                                           Keith A. Istre
                                           Vice President - Finance and
                                           Chief Financial Officer

                                       Outdoor West, Inc. of Tennessee,
                                       a Georgia corporation

                                       By: /s/ Keith A. Istre
                                           ----------------------------
                                           Keith A. Istre
                                           Vice President - Finance and
                                           Chief Financial Officer

Attested:

By: /s/ James R. McIlwain
    ----------------------------
    James R. McIlwain, Secretary

Accepted and agreed:

THE CHASE MANHATTAN BANK,
as Administrative Agent

By: /s/ William E. Rottino
    ----------------------------
Title: Vice President

                                       3

<PAGE>   4

The undersigned hereby respectively pledges and grants a security interest in
the Pledged Equity and evidenced by the certificate listed in Appendix A hereto
and agrees that Annex 1 of the above-referenced Pledge Agreement is hereby
supplemented by adding thereto the information listed on Appendix A.

The Lamar Company, LLC, Issuee of Stock

By:

By: /s/ Keith A. Istre
    -------------------------
    Keith A. Istre
Title: Vice President-Finance

                                       4

<PAGE>   5

SUPPLEMENT TO ANNEX 1

                                                 APPENDIX A TO JOINDER AGREEMENT

<TABLE>
<CAPTION>
PLEDGOR OWNERSHIP              ISSUER                  NO. SHARES      CERT. NO.     %
-----------------              ---------------         ----------      ---------    ---
<S>                            <C>                       <C>              <C>       <C>
The Lamar Company, L.L.C.      Lamar Ohio                1,000            35        100
                               Outdoor Holding
                               Corp.

</TABLE>

                                       5

<PAGE>   6

                  SCHEDULE OF ADDITIONAL SUBSIDIARY GUARANTORS

<TABLE>
<CAPTION>
GUARANTOR*                                       DATE OF JOINDER AGREEMENT
----------                                       -------------------------
<S>                                              <C>
Lamar KYO, Inc.                                  September 18, 2000

Lamar Oklahoma Holding Company, Inc.             August 30, 2000

Lamar I040 West, Inc.                            August 30, 2000

Lamar Berches, Inc.                              August 30, 2000

Lamar Advertising of Oklahoma, Inc.              August 30, 2000

LC Billboard, L.L.C.                             September 25, 2000

Lamar Wright Poster Corp.                        October 13, 2000

Missouri Logos, LLC                              October 13, 2000

Kentucky Logos, LLC                              October 13, 2000

Lamar Aztec, Inc.                                August 30, 2000
</TABLE>

*The supplements to Annex 1/Appendix A to the Joinder Agreements of each
additional guarantor are set forth below in their entirety.

                                       6

<PAGE>   7

                 SUPPLEMENT TO LAMAR KYO, INC. JOINDER AGREEMENT

SUPPLEMENT TO ANNEX 1

                                                 APPENDIX A TO JOINDER AGREEMENT

<TABLE>
<CAPTION>
PLEDGOR OWNERSHIP              ISSUER        NO. SHARES      CERT. NO.      %
-----------------              ------        ----------      ---------     ---
<S>                            <C>             <C>           <C>           <C>
The Lamar Company, L.L.C.      Lamar KYO     100 Class A     5             100
</TABLE>

                                       7

<PAGE>   8

                        SUPPLEMENT TO JOINDER AGREEMENT

SUPPLEMENT TO ANNEX 1

                                                 APPENDIX A TO JOINDER AGREEMENT

<TABLE>
<CAPTION>
PLEDGOR OWNERSHIP                      ISSUER                  NO. SHARES    CERT. NO.      %
-----------------                      ------                  ----------    ---------     ---
<S>                              <C>                           <C>           <C>           <C>

Lamar Media Corp.                Lamar Oklahoma
                                   Holding Company, Inc.           100           3         100

Lamar Oklahoma                   Lamar Advertising of
  Holding Company, Inc.            Oklahoma, Inc.                  100           6         100

Lamar Oklahoma
  Holding Company, Inc.          Lamar I-40 West, Inc.             100           2         100

Lamar Advertising of
  Oklahoma, Inc.                 Lamar Benches, Inc.               100           2         100
</TABLE>

                                        8

<PAGE>   9

              SUPPLEMENT TO LC BILLBOARD, L.L.C. JOINDER AGREEMENT

SUPPLEMENT TO ANNEX 1

                                                 APPENDIX A TO JOINDER AGREEMENT

<TABLE>
<CAPTION>
PLEDGOR OWNERSHIP                ISSUER                       NO. SHARES      CERT. NO.      %
-----------------                ------                       ----------      ---------     ---
<S>                              <C>                          <C>             <C>           <C>
The Lamar Company, L.L.C.        LC Billboard, L.L.C.         1000            1             100
</TABLE>

<PAGE>   10

            SUPPLEMENT TO LAMAR WRIGHT POSTER CORP. JOINDER AGREEMENT

SUPPLEMENT TO ANNEX 1

                                                 APPENDIX A TO JOINDER AGREEMENT

<TABLE>
<CAPTION>
PLEDGOR OWNERSHIP                ISSUER                         NO. SHARES      CERT. NO.      %
-----------------                ------                         ----------      ---------     ---
<S>                              <C>                            <C>             <C>           <C>
Lamar Outdoor Corporation        Lamar Wright Poster Corp.      1,000           5             100
</TABLE>

                                       10

<PAGE>   11

   SUPPLEMENT TO MISSOURI LOGOS LLC AND KENTUCKY LOGOS, LLC JOINDER AGREEMENT

SUPPLEMENT TO ANNEX 1

                                                 APPENDIX A TO JOINDER AGREEMENT

<TABLE>
<CAPTION>
PLEDGOR OWNERSHIP                    ISSUER                            NO. SHARES      CERT. NO.      %
-----------------                    ------                            ----------      ---------     ---

<S>                                  <C>                               <C>             <C>           <C>
Interstate Logos, Inc.               Missouri Logos, LLC               1,000           1             100
Interstate Logos, Inc.               Kentucky Logos, LLC               1,000           1             100
</TABLE>

                                       11

<PAGE>   12

                SUPPLEMENT TO LAMAR AZTEC, INC. JOINDER AGREEMENT

SUPPLEMENT TO ANNEX 1

                                                 APPENDIX A TO JOINDER AGREEMENT

<TABLE>
<CAPTION>
PLEDGOR OWNERSHIP                    ISSUER                            NO. SHARES      CERT. NO.      %
-----------------                    ------                            ----------      ---------     ---

<S>                                  <C>                               <C>             <C>           <C>
Lamar OCI North Corporation          Lamar Aztec, Inc.                 100             22            100
</TABLE>

                                       12<PAGE>   1
                                                                  EXHIBIT 10.110

                         TERMINATION OF LEASE AGREEMENT

         THIS TERMINATION OF LEASE AGREEMENT (the "Agreement") is made and
entered into by and between COI HOTEL GROUP, INC. ("Lessee"), a Delaware
corporation, and CRESCENT REAL ESTATE FUNDING IX, L.P. ("Lessor"), a Delaware
limited partnership, successor-in-interest to Crescent Real Estate Equities
Limited Partnership, a Delaware limited partnership ("CREELP").

                                  WITNESSETH:

         WHEREAS, Crescent Real Estate Equities Limited Partnership, as the
owner of those certain tracts or parcels of land situated in Harris County,
Texas, which are more particularly described in Exhibit " A " attached hereto
and made a part hereof for all purposes (collectively, the "Land"), together
with certain improvements located thereon known as The Four Seasons Hotel
Houston (the Land together with the improvements located thereon shall be
referred to herein as the "Hotel"), entered into that certain Lease Agreement
dated effective as of September 22, 1997 (herein called the "Lease Agreement")
in favor of Lessee covering the Hotel and other properties therein described;
and

         WHEREAS, CREELP, in its capacity as "Owner", entered into that certain
Amended and Restated Houston Center Hotel and Residential Management Agreement
dated as of September 22, 1997, with Four Seasons Hotel Limited ("Four
Seasons"), a corporation incorporated under the laws of the Province of Ontario,
in its capacity as "Operator", to operate and manage the Hotel, as amended
pursuant to (1) two side letter agreements, each dated September 22, 1997, and
(2) First Amendment to Amended and Restated Houston Center Hotel and Residential
Management Agreement dated June 1, 2000 (as amended, the "Management
Agreement"); and WHEREAS, Lessor has succeeded to all of the rights, titles and
interests of CREELP in and to the Hotel as well as all of the rights and
interests of CREELP under the Lease Agreement and under the Management
Agreement; and

         WHEREAS, the Lease Agreement was amended by First Amendment to Lease
Agreement dated December 31, 1998, between Lessor and Lessee (the Lease
Agreement as amended by the First Amendment to Lease Agreement shall be herein
referred to as the "Lease"); and

         WHEREAS, Article XXXVII of the Lease grants to Assignor the option to
terminate the Lease in connection with the sale of the Hotel and in
consideration for the payment of certain sums provided for therein; and

         WHEREAS Lessee has agreed to the termination of the Lease on the terms
hereinafter set forth.

         NOW, THEREFORE, for TEN and NO/100 DOLLARS and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Lessor and Lessee do hereby agree as follows:

<PAGE>   2

1.       As of the "Effective Time" hereinafter set forth, the Lease shall
         terminate and be of no further force and effect except as to all
         obligations of the parties thereunder which are existing as of the
         Effective Time and survive termination of the Lease, including but not
         limited to Lessee's obligations under Sections 7.4, 7.5, 7.7 and 7.10,
         and Lessee's and Lessor's obligations under Sections 20.1 and 38.1 of
         the Lease. All of Lessee's obligations with respect to payment of Base
         Rent, Percentage Rent and Impositions, as such terms are defined in
         this Lease, shall be prorated between the Lessee and Lessor as of the
         Effective Time.

2.       Following the Effective Time, Lessor and Lessee agree that they shall
         cooperate in a good faith effort to reach an agreement as to the amount
         of a termination fee to be paid by Lessor to Lessee as a result of
         termination of the Lease. If Lessor and Lessee are not able to agree
         within six months from and after the Effective Time as to the amount of
         a termination fee to be paid to Lessee, then Lessor and Lessee agree
         that the amount of termination fee shall be determined pursuant to the
         provisions of Section 37.1 of the Lease. Although the parties
         acknowledge that the compensation required to be paid by Lessor to
         Lessee shall be payable in the future in accordance with the foregoing
         terms, such deferral of payment of such compensation shall not in any
         way or to any extent whatsoever qualify, condition, or impair the
         termination of the Lease as of the Effective Time.

3.       As of the Effective Time, all of the rights, titles and interests of
         Lessee in all of the items referenced in Section 2.1 of the Lease as
         the Leased Property, whether existing at the commencement of the Lease
         or acquired during the term of the Lease, as well as those items listed
         in subparagraphs (aa) through subparagraph (hh), inclusive, in Section
         32.1 of the Lease, whether existing at the commencement of the Lease or
         acquired during the term of the Lease ( collectively the
         "Intangibles"), are hereby transferred, assigned and released by Lessee
         to Lessor pursuant to said Section 2.1 of the Lease, including but not
         limited to all of Lessee's rights, titles and interests in the
         Management Agreement, in all other leases, contracts, concession
         agreements and other agreements in effect with respect to the Hotel,
         and in all other properties, assets and interests relating to the
         Hotel; save and except those properties, assets and interests to which,
         by the provisions of the Lease Agreement, Lessee is entitled following
         termination of the Lease. As of the Effective Time, Lessor shall assume
         and agree to keep, fulfill, observe, perform and discharge each and
         every duty and obligation that shall accrue and become performable, due
         or owing by Lessee under or with respect to any of the Intangibles,
         including, but not limited to the duties and obligations of Lessee, in
         its capacity as Owner under the terms and provisions of the Management
         Agreement. Lessee agrees that upon request of Lessor (and at Lessor's
         expense) it shall execute such other documents as shall be reasonably
         necessary to transfer to Lessor any of the Licenses, leases, contracts
         and other properties referred to and described in Section 38.1 of the
         Lease.

4.       Lessee hereby represents and warrants to Lessor that Lessee has the
         full right and

                                       2
<PAGE>   3

         authority to enter into this Agreement and that Lessee has not
         previously assigned any of Lessee's rights, titles or interests under
         the Lease Agreement or the related properties to any other person or
         entity.

5.       Lessor hereby represents to Lessee that Lessor has the full right and
         authority to execute and enter into this Agreement.

6.       This Agreement shall be governed by and construed in accordance with
         the laws of the State of Texas.

7.       This Agreement may be executed in a separate identical counterpart
         which taken together shall constitute one and the same instrument.

8.       This Agreement and the terms hereof will be binding upon and inure to
         the benefit of Lessor and Lessee and their respective successors and
         assigns.

9.       The Effective Time, as herein defined, shall be one minute before the
         dated of the transfer of the Management Agreement from Lessor to HEF
         Houston LP .

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       3
<PAGE>   4

         EXECUTED to be effective as of the Effective Time.

                                   ASSIGNOR:

                                   COI HOTEL GROUP, INC., a Delaware
                                   corporation

                                   By:
                                      -----------------------------------------
                                   Name:
                                        ---------------------------------------
                                   Title:
                                         --------------------------------------

                                   ASSIGNEE:

                                   CRESCENT REAL ESTATE FUNDING IX, a
                                   Delaware limited partnership

                                   By: CRE Management IX, LLC, a Delaware
                                       limited liability company, its general
                                       partner

                                       By: Crescent Real Estate Equities,
                                           Ltd., a Delaware corporation, its
                                           manager

                                           By:
                                              ---------------------------------
                                           Name:
                                                -------------------------------
                                           Title:
                                                 ------------------------------

                                       4
<PAGE>   5

                                    EXHIBIT A
                                LEGAL DESCRIPTION
                               FOUR SEASONS HOTEL

ITEM ONE:

All of Block 252, S.S.B.B., City of Houston, Harris County, Texas, being that
property bounded by the center lines of Caroline and Austin Streets and Lamar
and Dallas Avenues in the City of Houston, Harris County, Texas, together with
all improvements thereon, including (a) the Four Seasons Hotel-Houston Center;
(b) the skyway connecting Blocks 252 and 131 to the center line of Lamar Avenue;
and ( c) the skyway connecting Blocks 252 and 253 to the center line of Caroline
Street.

ITEM TWO:

All those air rights, as hereinafter defined, in the property described in Item
One, being a portion of those rights conveyed by the City of Houston to Houston
Center Corporation by one or both of the following two Quitclaim Deeds, the
first dated August 26, 1971, recorded under Harris County Clerk's File No.
D404337 and Film Code No. 133-27- 0968; and the second dated December 18, 1973,
recorded under Harris County Clerk's File No. El18604 and Film Code
No.###-##-####, both such deeds being authorized by City of Houston Ordinance
No.70-1881 passed on October 28, 1970, the air rights conveyed by said Quitclaim
Deeds being the City of Houston easement rights between a plane 20 feet above
the crowns of the existing streets and a plane 500 feet above such street
crowns, including those surrounding Item One, there, however, being excepted
from this Item Two such air rights to the extent that the same relate to the
Northerly half of Dallas Avenue from the center line of Caroline Street to the
center line of Austin Street.

ITEM THREE:

A strip of land 4.98 feet wide by 50 feet in length being the City of Houston
easement rights and interests described in and conveyed by that certain
Quitclaim Deed dated August 27, 1956, from the City of Houston, Texas, to M. J.
Salley, recorded in Volume 3216, Page 2, of the Deed Records of Harris County,
Texas.

ITEM FOUR:

A strip of land 4.98 feet wide described in City of Houston Ordinance No.2984,
passed as of August 22, 1956, recorded in Volume 3216, Page 5, of the Deed
Records of Harris County, Texas, establishing a building line 4.98 feet east of
the original building line along Austin Street.

                                   Exhibit A-i

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