SEC-718 -- RECIPROCITY IN APPROVAL OF HOUSING SUBDIVISIONS AMONG FEDERAL AGENCIES. (a) Extension of Authority.-Section 535 of the Housing Act of 1949 (42 U.S.C. 1490o) is amended in subsection (b), by striking "6-month period" and inserting "18-month period". (b) Retroactivity.-Any administrative approval of any housing subdivision made after the expiration of the 6-month period beginning on the date of the enactment of the Department of Housing and Urban Development Reform Act of 1989 and before the date of the enactment of this Act is hereby approved and shall be considered to have been lawfully made, but only if otherwise made in accordance with the provisions of section 535(b) of the Housing Act of 1949.