; compliance evaluation The Secretary of Housing and Urban Development shall— (1) issue such regulations as may be necessary to carry out this section; (2) evaluate the compliance by servicers and owners with the requirements of this section; and (3) enforce the requirements of this section. (h) Definitions For purposes of this section: (1) Eligible mortgagor The term eligible mortgagor means a mortgagor under an eligible mortgage. (2) Eligible mortgage The term eligible mortgage means a first or subordinate mortgage on a property that— (A) is a single family property; and (B) is currently being used as the principal residence of the eligible mortgagor. (3) Single family property The term single family property means— (A) a structure consisting of 1 to 4 dwelling units; (B) a dwelling unit in a multi-unit condominium property together with an undivided interest in the common areas and facilities serving the property; (C) a dwelling unit in a multi-unit project for which purchase of stock or a membership interest entitles the purchaser to permanent occupancy of that unit; or (D) a manufactured housing unit.