of amount (A) In general The term rental reduction credit amount means, with respect to any qualified building, the dollar amount which is allocated to such building (and to eligible senior units within such building) under this subsection. Such dollar amount shall be allocated to months in the credit period with respect to such building (and units) on the basis of reasonable estimates of rents, family incomes, and vacancies in accordance with procedures established by the State as part of its State rental reduction allocation plan. (B) Allocation on project basis In the case of a project which includes (or will include) more than 1 building, the rental reduction credit amount shall be the dollar amount which is allocated to such project for all buildings included in such project. Such amount shall be allocated among such buildings in the manner specified by the taxpayer unless the qualified rental reduction agreement with respect to such project provides for such allocation. (2) State allocation Each rental reduction credit agency of a State shall each calendar year allocate its portion of the State rental reduction credit ceiling to buildings (and to eligible senior units within such building) in accordance with the State rental reduction allocation plan. (3) Allocated credit amount to apply to all taxable years ending during or after credit allocation year Any rental reduction credit amount allocated to any building out of the State rental reduction credit ceiling for any calendar year— (A) shall apply to such building for months in the credit period ending during or after such calendar year, and (B) shall reduce the portion of such ceiling of the allocating agency only for such calendar year. (4) State rental reduction credit ceiling (A) In general The State rental reduction credit ceiling applicable to any State for any calendar year shall be an amount equal to the sum of— (i) the greater of— (I) the per capita amount multiplied by the State population, or (II) the minimum ceiling amount, plus (ii) the