; (ii) at a monthly rent amount that does not exceed 30 percent of the monthly adjusted income of the tenant low-income family; and (iii) maintains affordability for residents who are low-income families for a period of not less than 30 years; (9) the term relevant agency head means, with respect to funds made available pursuant to any section of this Act, the head of the Federal agency responsible for administering the program under which those funds are to be expended; and (10) the term Secretary means the Secretary of Housing and Urban Development. 4. Public Housing Capital Fund (a) Authorization of appropriations (1) In general There is authorized to be appropriated for the Capital Fund under section 9(d) of the United States Housing Act of 1937 ( 42 U.S.C. 1437g(d) ) $70,000,000,000. (2) Availability of funds Any amounts appropriated pursuant to this subsection shall remain available until the date that is 5 years after the date of the appropriation. (b) Requirements The Secretary shall— (1) distribute not less than 35 percent and not more than 75 percent of any amounts appropriated pursuant to subsection (a) under the same formula used for amounts made available for the Capital Fund for fiscal year 2019, except that the Secretary may determine not to allocate funding to public housing agencies that are designated as troubled at the time of such determination or to public housing agencies that elect not to accept such funding, or both; and (2) make available all remaining amounts by competition for priority investments, including investments that address lead hazards, other urgent health and safety concerns, and such other priorities as the Secretary may identify. (c) Timing The Secretary shall obligate amounts— (1) made available under subsection (b)(1) within 30 days of enactment of the Act appropriating such funds