No housing allowance payments shall be made after July 1, 1985. After January 1, 1975, the Secretary shall not enter into contracts under the United States Housing Act of 1937 [42 U.S.C. 1437 et seq.] to carry out the purposes of this section. The Secretary may contract with public or private agencies for the performance of administrative functions in connection with the programs authorized by this section.

Notwithstanding the provisions of paragraph (1), the Secretary shall, to the extent approved in appropriation Acts, extend the annual contributions contracts for the experimental housing allowance supply program through September 30, 1989, on the same terms and conditions as the original contracts, for the sole purpose of providing assistance for homeowners participating in such program on June 1, 1983. In extending such contracts, the Secretary may, to the extent approved in appropriation Acts, use authority available under section 5(c) of the United States Housing Act of 1937 [42 U.S.C. 1437c(c)].