Mortgage. The mortgage or deed of trust insured or held by the Commissioner or a State or State agency under parts 221 or 236 of this title or the purchase money mortgage taken back by the Commissioner in connection with the sale of a HUD-owned project and held by the Commissioner, where such mortgage, deed or trust or purchase money mortgage is secured by eligible low income housing.
24 CFR § 248.101
Acquisition Loan. A loan or advance of credit made to a qualified purchaser of eligible low income housing and insured by the Commissioner under part 241, subpart E of this chapter.