; (2) the supportive housing for the elderly program under section 202 of the Housing Act of 1959 ( 12 U.S.C. 1701q ); or (3) the supportive housing for persons with disabilities program under section 811(d)(2) of the Cranston-Gonzalez National Affordable Housing Act ( 42 U.S.C. 8013(d)(2) ). (b) Requirements (1) Payments contingent on savings (A) In general The Secretary shall provide to an entity a payment under an agreement under this section only during applicable years for which an energy or water cost savings is achieved with respect to the applicable multifamily portfolio of properties, as determined by the Secretary, in accordance with subparagraph (B). (B) Payment methodology (i) In general Each agreement under this section shall include a pay-for-success provision— (I) that will serve as a payment threshold for the term of the agreement; and (II) pursuant to which the Department of Housing and Urban Development shall share a percentage of the savings at a level determined by the Secretary that is sufficient to cover the administrative costs of carrying out this section. (ii) Limitations A payment made by the Secretary under an agreement under this section shall— (I) be contingent on documented utility savings; and (II) not exceed the utility savings achieved by the date of the payment, and not previously paid, as a result of the improvements made under the agreement. (C) Third party verification Savings payments made by the Secretary under this section shall be based on a measurement and verification protocol that includes at least— (i) establishment of a weather-normalized and occupancy-normalized utility consumption baseline established preretrofit; (ii) annual third party confirmation of actual utility consumption and cost for owner-paid utilities; (iii) annual third party validation of the tenant utility allowances in effect during the applicable year and vacancy rates for each unit type