In addition to individual loans made or insured under subsection (a) of this section the Secretary is authorized, upon such terms and conditions (substantially identical insofar as may be feasible with those specified in section
1485 of this title) as he may prescribe, to make or insure blanket loans to a borrower who shall certify to the Secretary, as a condition of obtaining such loan or insurance, that upon completion of the multifamily project the ownership of the project will be committed to a plan of family unit ownership under which