(a) Notwithstanding any other provision of the general statutes, in the case of any school building project for which the total cost is less than one million dollars, the state shall not require permanent local financing prior to the payment of an interest subsidy grant under sections 10-292c to 10-292n, inclusive. In any such case, the school district may pay off its debt on any such project over a period not to exceed four years if the school district promptly applies all interest subsidy grant payments toward interest costs on such debt as the same becomes due and payable and provides for the payment of such debt in equal annual installments commencing no later than one year from the date of issue. The interest subsidy grant percentage on such debt of the district shall be the same as if permanent financing had been used.

(b) Interest subsidy grants shall be available for bonds issued after July 1, 1971, for the local share of the cost of a school building project eligible for assistance under § 10-287a. The State Comptroller is authorized and directed to draw an order on the State Treasurer upon certification of the Commissioner of Education to pay any regional school district, town, consolidated town and city, and consolidated town and borough an interest subsidy grant on such bonds issued after July 1, 1971, for the local share of the cost of such school building project but not in excess of the amount certified as such share by the Commissioner of Education for such project. The local share of the cost of such project shall be the total cost of such project, as determined by the Commissioner of Education to be eligible for assistance under § 10-287a, less the total grant payments made by the state. Such interest subsidy shall be the difference between four per cent per annum and the lower of six per cent per annum or the net interest cost on such bonds. Such payments may be made on a reimbursement basis in the event the bonds were issued prior to the date of certification from the commissioner to the State Comptroller in accordance with sections 10-292c to 10-292n, inclusive.