Exhibit 10.66

ARBITRATION AND NOTICE OF FINAL AGREEMENT

405 State Highway 121 Bypass

Building A, Suite 250

Lewisville, Texas 75067

(collectively, whether one or more, “ Borrower ”)

As of the effective date of this Notice, Borrower and THE FROST NATIONAL BANK, a national banking association (“ Lender ”) have consummated a transaction pursuant to which Lender has agreed to renew and extend an existing loan or loans to Borrower in the principal amounts of $2,000,000.00 and $999,999.90 and/or to otherwise extend credit or make financial accommodations to or for the benefit of Borrower (collectively, whether one or more, the “ Loan ”).

ARBITRATION

Upon written request of either Lender or Borrower, any controversy or claim between or among the parties hereto including but not limited to those arising out of or relating to the Loan, any of the loan documents or any related agreements or instruments executed in connection with the Loan (the “ Loan Documents ”), including any claim based on or arising from an alleged tort, shall be determined by binding arbitration in accordance with the Federal Arbitration Act (or if not applicable, the applicable state law), the Commercial Arbitration Rules of the American Arbitration Association, and the “Special Rules” set forth below unless both Lender and Borrower, in their respective sole discretion, agree in writing to mediate the dispute prior to submitting to binding arbitration. In the event of any inconsistency, the Special Rules shall control. Judgment upon any arbitration award may be entered in any court having jurisdiction. Any party to this Agreement may bring an action, including a summary or expedited proceeding, to compel arbitration of any controversy or claim to which this agreement applies in any court having jurisdiction over such action. The party that requests arbitration has the burden to initiate the arbitration proceedings pursuant to and by complying with the Commercial Arbitration Rules of the American Arbitration Association and shall pay all associated administrative and filing fees.

The arbitration shall be conducted in the City of San Antonio, Bexar County, Texas and administered by the American Arbitration Association. All arbitration hearings will be commenced within sixty (60) days of the written request for arbitration, and if the arbitration hearing is not commenced within the sixty (60) days, the party that requested arbitration shall have waived its election to arbitrate. Nothing in this Agreement shall be deemed to (i) limit the applicability of any otherwise applicable statutes of limitation