; and in addition such sums as may be necessary, as authorized by section 521(c) of the Act, to liquidate debt incurred prior to fiscal year 1992 to carry out the rental assistance program under section 521(a)(2) of the Act: Provided , That of the amounts made available under this heading, $1,410,000,000 shall be available for renewal of rental assistance agreements: Provided further , That rental assistance agreements entered into or renewed during the current fiscal year shall be funded for a one-year period: Provided further , That upon request by an owner of a project financed by an existing loan under section 514 or 515 of the Act, the Secretary may renew the rental assistance agreement for a period of 20 years or until the term of such loan has expired, subject to annual appropriations: Provided further , That any unexpended balances remaining at the end of such one-year agreements may be transferred and used for purposes of any debt reduction, maintenance, repair, or rehabilitation of any existing projects; preservation