Declining supply of low and moderate income rental housing : hearing before the Subcommittee on Housing and Urban Affairs of the Committee on Banking, Housing, and Urban Affairs, United States Senate, One hundredth Congress, first session, on the decline in subsidized units expected during the late 1980's and 1990's assuming owners opt out of the section 8 or section 236 programs when their contractual obligations expire, June 5, 1987.