In computing the rental for this purpose of selecting tenants, there shall be included in the rental the average annual cost, as determined by the housing authority, to occupants of heat, water, electricity, gas, a cooking range and other necessary services or facilities, whether or not the charge for such services and facilities is in fact included in the rental; provided, that an authority may agree to conditions as to tenant eligibility or preference required by the federal government pursuant to federal law in any contract for financial assistance with the authority.
Ala. Code § 24-1-6 (1975)