; (4) $686,000,000 shall be available for the renewal of tenant-based assistance contracts under section 811 of the Cranston-Gonzalez National Affordable Housing Act ( 42 U.S.C. 8013 ), including necessary administrative expenses: Provided, That administrative and other expenses of public housing agencies in administering the special purpose vouchers in this paragraph shall be funded under the same terms and be subject to the same pro rata reduction as the percent decrease for administrative and other expenses to public housing agencies under paragraph (3) of this heading: Provided further, That up to $10,000,000 shall be available only— (A) for adjustments in the allocation for public housing agencies, after applications for an adjustment by a public housing agency that experienced a significant increase, as determined by the Secretary, in Mainstream renewal costs resulting from unforeseen circumstances; and (B) for public housing agencies that despite taking reasonable cost savings measures, as determined by the Secretary, would otherwise be required to terminate the rental assistance for Mainstream families as a result of insufficient funding: Provided further, That the Secretary shall allocate amounts under the preceding proviso based on need, as determined by the Secretary: Provided further, That upon turnover, section 811 special purpose vouchers funded under this heading in this or prior Acts, or under any other heading in prior Acts, shall be provided to non-elderly persons with disabilities