obligate any available unobligated balances made available under this heading in this, or any prior Act. Family self-sufficiency For the Family Self-Sufficiency program to support family self-sufficiency coordinators under section 23 of the United States Housing Act of 1937, to promote the development of local strategies to coordinate the use of assistance under sections 8(o) and 9 of such Act with public and private resources, and enable eligible families to achieve economic independence and self-sufficiency, $80,000,000, to remain available until September 30, 2020: Provided , That the Secretary may, by Federal Register notice, waive or specify alternative requirements under subsections b(3), b(4), b(5), or c(1) of section 23 of such Act in order to facilitate the operation of a unified self-sufficiency program for individuals receiving assistance under different provisions of the Act, as determined by the Secretary: Provided further , That owners of a privately owned multifamily property with a section 8 contract may voluntarily make a Family Self-Sufficiency program available to the assisted tenants of such property in accordance with procedures established by the Secretary: Provided further , That such procedures established pursuant to the previous proviso shall permit participating tenants to accrue escrow funds in accordance with section 23(d)(2) and shall allow owners to use funding from residual receipt accounts to hire coordinators for their own Family Self-Sufficiency program. Native american housing block grants (Including transfer of funds) For the Native American Housing Block Grants program, as authorized under title I of the Native American Housing Assistance and Self-Determination Act of 1996 (NAHASDA) ( 25 U.S.C. 4111 et seq.), $655,000,000, to remain available until September 30, 2023: Provided , That, notwithstanding NAHASDA, to determine the amount of the allocation under title I of such Act for each Indian tribe, the Secretary shall apply the formula under section 302 of such Act with the