to this subparagraph shall be extended to all owners of projects described in clause (i) not later than 24 months before the maturation of the loan (except in the case of loans maturing after the date that is 24 months before the date of enactment of this subparagraph). (iii) Terms Each contract for assistance payments pursuant to this subparagraph shall— (I) have a term of 20 years and be subject to availability of amounts provided in annual appropriations Acts