; and (B) not less than 1 story of residential units above the establishments described in subparagraph (A). (8) Quadplex The term quadplex means a residential building divided into 4 units, each of which has a separate entrance. (9) Secretary The term Secretary means the Secretary of Housing and Urban Development. (10) Triplex The term triplex means a residential building divided into 3 units, each of which has a separate entrance. (11) Multifamily housing The term multifamily housing — (A) means housing accommodations that— (i) are designed principally for residential use; (ii) conform to standards satisfactory to the Secretary; and (iii) consist of not less than 5 rental units on a site