The Town shall be entitled to audit the books and records of a contractor or any subcontractor under any negotiated contract or subcontract other than a firm fixed price contract to the extent that such books and records relate to the performance of such contract or subcontract. Such books and records shall be maintained by the contractor for a period of three (3) years from the date of final payment under the prime contract and by the subcontractor for a period of three (3) years from the date of final payment under the subcontract, unless a shorter period is otherwise authorized in writing. (Prior code 17.03.190)