24 C.F.R. § 906.25
Ownership interests that may be conveyed to a purchaser
A homeownership program may provide for sale to the purchasing family of any ownership interest that the PHA considers appropriate under the homeownership program, including but not limited to:
(a) Ownership in fee simple;
(b) A condominium interest;
(c) An interest in a limited dividend cooperative;
(d) A shared appreciation interest with a PHA providing financing; or
(e) A leasehold under a bona fide lease-purchase arrangement.