mortgage
(2) For the purposes of this subchapter, the terms “owner” and “mortgage” shall be deemed to include, respectively, the lessee of, and other security interest in, any leasehold interest which the Secretary determines has an unexpired term (A) in the case of a loan, for a period sufficiently beyond the repayment period of the loan to provide adequate security and a reasonable probability of accomplishing the objectives for which the loan is made, and (B) in the case of a grant for a period sufficient to accomplish the objectives for which the grant is made.