102 STAT. 3232 PUBLIC LAW 100-628—NOV. 7, 1988 "(D) the assistance will not supplant funding for preexist- ing homelessness prevention activities from other sources. Activities under this paragraph shall be treated as 'essential services' for the purpose of paragraph (2XB).". 42 USC11374 (b) HEPORTING REQUIREMENT.—The Comptroller General of the note. United States shall conduct a study and report to the Congress not later than 1 year after the date of the enactment of this Act on various programs to prevent homelessness implemented by grantees, with particular focus on the different methods employed by grantees to determine eligibility for homelessness prevention assistance and restrictions or limitations, if any, imposed under such programs. Such report shall include— (1) an examination of other homelessness prevention pro- grams, including other Federal programs and State and local programs; and (2) recommendations for such legislation as the Comptroller General determines appropriate, including recommendations on how to prevent homelessness as a result of mortgage foreclosures. SEC. 424. REQUIRED USE OF BUILDING AS SHELTER. Section 415(cXD of the Stewart B. McKinney Homeless Assistance Act (42 U.S.C. 11375(cXl)) is amended to read as follows: "(1) it will— "(A) in the case of assistance involving major rehabilita- tion or conversion, maintain any building for which assist- ance is used under this subtitle as a shelter for homeless individuals and families for not less than a 10-year period; "(B) in the case of assistance involving rehabilitation (other than major rehabilitation or conversion), maintain any building for which assistance is used under this subtitle as a shelter for homeless individuals and families for not less than a 3-year period; or "(C) in the case of assistance involving solely activities described in paragraphs (2) and (3) of section 414(a), provide services or shelter to homeless individuals and families for the period during which such assistance is provided, with- out regard to a particular site or structure as long as the same general population is served.". SEC. 425. AUTHORIZATION OF APPROPRIATIONS. Section 417 of the Stewart B. McKinney Homeless Assistance Act (42 U.S.C. 11377) is amended to read as follows: "•SEC. 417. AUTHORIZATION OF APPROPRIATIONS. "There are authorized to be appropriated to carry out this subtitle $120,000,000 for fiscal year 1989 and $125,000,000 for fiscal year j.y«/u- . Subtitle C—Supportive Housing SEC. 441. AVAILABILITY OF OPERATING AND TECHNICAL ASSISTANCE FOR NEW STRUCTURES. (a) DEFINITION OF PROJECT.—Section 422(7) of the Stewart B. McKinney Homeless Assistance Act (42 U.S.C. 11382(7)) is amended by inserting before the period at the end the following: "or with