(13) PHA project-based assistance (A) In general A public housing agency may use amounts provided under an annual contributions contract under this subsection to enter into a housing assistance payment contract with respect to an existing, newly constructed, or rehabilitated structure, that is attached to the structure, subject to the limitations and requirements of this paragraph. (B) Percentage limitation Not more than 20 percent of the funding available for tenant-based assistance under this section that is administered by the agency may be attached to structures pursuant to this paragraph. (C) Consistency with PHA plan and other goals A public housing agency may approve a housing assistance payment contract pursuant to this paragraph only if the contract is consistent with— (i) the public housing agency plan for the agency approved under section 1437c–1 of this title ; and (ii) the goal of deconcentrating poverty and expanding housing and economic opportunities. (D) Income mixing requirement (i) In general Not more than 25 percent of the dwelling units in any project may be assisted under a housing assistance payment contract for project-based assistance pursuant to this paragraph. For purposes of this subparagraph, the term “project” means a single building, multiple contiguous buildings, or multiple buildings on contiguous parcels of land. (ii) Exceptions The limitation under clause (i) shall not apply in the case of assistance under a contract for housing consisting of single family properties or for dwelling units that are specifically made available for households comprised of elderly families, disabled families, and families receiving supportive services. (E) Resident choice requirement A housing assistance payment contract pursuant to this paragraph shall provide as follows: (i) Mobility Each low-income family occupying a dwelling unit assisted under the contract may move from the housing at any time after the family has occupied the dwelling unit for 12 months. (ii) Continued assistance Upon such a move, the public housing agency shall provide the low-income family with tenant-based rental assistance under this section or such other tenant-based rental assistance that is subject to comparable income, assistance, rent contribution, affordability, and other requirements, as the Secretary shall provide by regulation. If such rental assistance is not immediately available to fulfill the requirement under the preceding sentence with respect to a low-income family, such requirement may be met by providing the family priority to receive the next voucher or other tenant-based rental assistance amounts that become available under the program used to fulfill such requirement. (F) Contract term A housing assistance payment contract pursuant to this paragraph between a public housing agency and the owner of a structure may have a term of up to 15 years, subject to the availability of sufficient appropriated funds for the purpose of renewing expiring contracts for assistance payments, as provided in appropriations Acts and in the agency’s annual contributions contract with the Secretary, and to annual compliance with the inspection requirements under paragraph (8), except that the agency shall not be required to make annual inspections of each assisted unit in the development. The contract may specify additional conditions for its continuation. If the units covered by the contract are owned by the agency, the term of the contract shall be agreed upon by the agency and the unit of general local government or other entity approved by the Secretary in the manner provided under paragraph (11). (G) Extension of contract term A public housing agency may enter into a contract with the owner of a structure assisted under a housing assistance payment contract pursuant to this paragraph to extend the term of the underlying housing assistance payment contract for such period as the agency determines to be appropriate to achieve long-term affordability of the housing or to expand housing opportunities. Such contract may, at the election of the public housing agency and the owner of the structure, specify that such contract shall be extended for renewal terms of up to 15 years each, if the agency makes the determination required by this subparagraph and the owner is in compliance with the terms of the contract. Such a contract shall provide that the extension of such term shall be contingent upon the future availability of appropriated funds for the purpose of renewing expiring contracts for assistance payments, as provided in appropriations Acts, and may obligate the owner to have such extensions of the underlying housing assistance payment contract accepted by the owner and the successors in interest of the owner. A public housing agency may agree to enter into such a contract at the time it enters into the initial agreement for a housing assistance payment contract or at any time thereafter that is before the expiration of the housing assistance payment contract. (H) Rent calculation A housing assistance payment contract pursuant to this paragraph shall establish rents for each unit assisted in an amount that does not exceed 110 percent of the applicable fair market rental (or any exception payment standard approved by the Secretary pursuant to paragraph (1)(D)), except that if a contract covers a dwelling unit that has been allocated low-income housing tax credits pursuant to section 42 of title 26 and is not located in a qualified census tract (as such term is defined in subsection (d) of such section 42), the rent for such unit may be established at any level that does not exceed the rent charged for comparable units in the building that also receive the low-income housing tax credit but do not have additional rental assistance, except that in the case of a contract unit that has been allocated low-income housing tax credits and for which the rent limitation pursuant to such section 42 is less than the amount that would otherwise be permitted under this subparagraph, the rent for such unit may, in the sole discretion of a public housing agency, be established at the higher section 8 [ 42 U.S.C. 1437f ] rent, subject only to paragraph (10)(A). The rents established by housing assistance payment contracts pursuant to this paragraph may vary from the payment standards established by the public housing agency pursuant to paragraph (1)(B), but shall be subject to paragraph (10)(A). (I) Rent adjustments A housing assistance payments contract pursuant to this paragraph shall provide for rent adjustments, except that— (i) the adjusted rent for any unit assisted shall be reasonable in comparison with rents charged for comparable dwelling units in the private, unassisted, local market and may not exceed the maximum rent permitted under subparagraph (H), except that the contract may provide that the maximum rent permitted for a dwelling unit shall not be less than the initial rent for the dwelling unit under the initial housing assistance payments contract covering the unit; and (ii) the provisions of subsection (c)(2)(C) shall not apply. (J) Tenant selection A public housing agency shall select families to receive project-based assistance pursuant to this paragraph from its waiting list for assistance under this subsection. Eligibility for such project-based assistance shall be subject to the provisions of section 1437n(b) of this title that apply to tenant-based assistance. The agency may establish preferences or criteria for selection for a unit assisted under this paragraph that are consistent with the public housing agency plan for the agency approved under section 1437c–1 of this title . Any family that rejects an offer of project-based assistance under this paragraph or that is rejected for admission to a structure by the owner or manager of a structure assisted under this paragraph shall retain its place on the waiting list as if the offer had not been made. The owner or manager of a structure assisted under this paragraph shall not admit any family to a dwelling unit assisted under a contract pursuant to this paragraph other than a family referred by the public housing agency from its waiting list. Subject to its waiting list policies and selection preferences, a public housing agency may place on its waiting list a family referred by the owner or manager of a structure and may maintain a separate waiting list for assistance under this paragraph, but only if all families on the agency’s waiting list for assistance under this subsection are permitted to place their names on the separate list. (K) Vacated units Notwithstanding paragraph (9), a housing assistance payment contract pursuant to this paragraph may provide as follows: (i) Payment for vacant units That the public housing agency may, in its discretion, continue to provide assistance under the contract, for a reasonable period not exceeding 60 days, for a dwelling unit that becomes vacant, but only: (I) if the vacancy was not the fault of the owner of the dwelling unit; and (II) the agency and the owner take every reasonable action to minimize the likelihood and extent of any such vacancy. Rental assistance may not be provided for a vacant unit after the expiration of such period. (ii) Reduction of contract That, if despite reasonable efforts of the agency and the owner to fill a vacant unit, no eligible family has agreed to rent the unit within 120 days after the owner has notified the agency of the vacancy, the agency may reduce its housing assistance payments contract with the owner by the amount equivalent to the remaining months of subsidy attributable to the vacant unit. Amounts deobligated pursuant to such a contract provision shall be available to the agency to provide assistance under this subsection. Eligible applicants for assistance under this subsection may enforce provisions authorized by this subparagraph. (L) Use in cooperative housing and elevator buildings A public housing agency may enter into a housing assistance payments contract under this paragraph with respect to— (i) dwelling units in cooperative housing; and (ii) notwithstanding subsection (c), dwelling units in a high-rise elevator project, including such a project that is occupied by families with children, without review and approval of the contract by the Secretary. (M) Reviews (i) Subsidy layering A subsidy layering review in accordance with section 3545(d) of this title shall not be required for assistance under this paragraph in the case of a housing assistance payments contract for an existing structure, or if a subsidy layering review has been conducted by the applicable State or local agency. (ii) Environmental review A public housing agency shall not be required to undertake any environmental review before entering into a housing assistance payments contract under this paragraph for an existing structure, except to the extent such a review is otherwise required by law or regulation.