Special rules
For purposes of applying this section with respect to expenditures which are treated as a separate building by reason of this subsection—
(A) such expenditures shall be treated as placed in service at the close of the 24-month period referred to in paragraph (3)(A), and
(B) the applicable fraction under subsection (c)(1) shall be the applicable fraction for the building (without regard to paragraph (1)) with respect to which the expenditures were incurred.
Nothing in subsection (d)(2) shall prevent a credit from being allowed by reason of this subsection.