The maximum payments imposed by section 2 do not prohibit payments made in accordance with applicable regulations for federal reimbursement which payments are hereby authorized, provided such payments are at least equal to payments under section 2. If payment is made in accordance with applicable federal regulation, payment shall not also be made pursuant to section 2. In no event shall more than 1 payment be made to the same occupant for the same occupancy. After the occupant has vacated the property, no payment may thereafter be paid to any party with respect to the subsequent occupancy of the same property.