After approving a plan of action from an owner of eligible low-income housing that includes the owner’s plan to extend the low-income affordability restrictions of the housing, the Secretary shall, subject to the availability of appropriations for such purpose, enter into such agreements as are necessary to enable the owner to receive (for each year after the approval of the plan of action) the annual authorized return for the housing determined under section
4104
(a) of this title, pay debt service on the federally-assisted mortgage covering the housing, pay debt service on any loan for rehabilitation of the housing, and meet project operating expenses and establish adequate reserves. The Secretary shall take into account the Federal cost limits under section
4105
(a) of this title for the housing when providing incentives under subsections (b)(2) and (3) of this section. The Secretary shall take such actions as are necessary to ensure that owners receive the annual authorized return for the housing determined under section
4104
(a) of this title during the period in which rent increases are phased in as provided in section
4112
(a)(2)(E) of this title, including (in order of preference)