Rental Assistance , $4,000,000,000, to remain available until expended, and to be used under the same authority and conditions as the additional appropriations for fiscal year 2020 under this heading in title XII of division B of the CARES Act ( Public Law 116–136 ), except that any amounts provided for administrative expenses and other expenses of public housing agencies for their section 8 programs, including Mainstream vouchers, under this heading in the CARES Act ( Public Law 116–136 ) and under this heading in this Act shall also be available for Housing Assistance Payments under section 8(o) of the United States Housing Act of 1937 ( 42 U.S.C. 1437f(o) ): Provided , That amounts made available under this heading in this Act and under the same heading in title XII of division B of the CARES Act may be used to cover or reimburse allowable costs incurred to prevent, prepare for, and respond to coronavirus regardless of the date on which such costs were incurred: Provided further , That of the amounts made available under this heading in this Act, $500,000,000 shall be available for administrative expenses and other expenses of public housing agencies for their section 8 programs, including Mainstream vouchers: Provided further , That of the amounts made available under this heading in this Act, $2,500,000,000 shall be available for adjustments in the calendar year 2020 or 2021 section 8 renewal funding allocations, including Mainstream vouchers, for public housing agencies that experience a significant increase in voucher per-unit costs due to extraordinary circumstances or that, despite taking reasonable cost savings measures, as determined by the Secretary, would otherwise be required to terminate rental assistance for families as a result of insufficient funding: Provided further , That of the amounts made available under this heading in this Act, $1,000,000,000 shall be used for incremental rental voucher assistance under section 8(o) of the United States Housing Act of 1937 for use by individuals and