Requirement
Except as provided in subsection (b) and notwithstanding any other provision of this chapter, no mortgage covering new or rehabilitated multifamily housing or a property or project described in subchapter IX–B shall be insured under this chapter unless the mortgagor has agreed (A) to certify, upon completion of the physical improvements on the mortgaged property or project and prior to final endorsement of the mortgage, either (i) that the approved percentage of actual cost (as those terms are herein defined) equaled or exceeded the proceeds of the mortgage loan or (ii) the amount by which the proceeds of the mortgage loan exceeded such approved percentage of actual cost, as the case may be, and (B) to pay forthwith to the mortgagee, for application to the reduction of the principal obligation of such mortgage, the amount, if any, certified to be in excess of such approved percentage of actual cost. Upon the Secretary’s approval of the mortgagor’s certification as required hereunder, such certification shall be final and incontestable, except for fraud or material misrepresentation on the part of the mortgagor.