5. Assistant directors are authorized to sign(1) construction contracts, concession contracts, contracts for services, supply contracts and contracts for the alienation of movable property, where the amount is less than $25,000;
(2) leases where the annual rent is less than $25,000 and riders where the amount is less than $25,000; and
(3) customer program changes, orders for changes and riders to construction contracts, concession contracts, contracts for services and supply contracts, where the amount is less than $2,500.