N.Y.C. Admin. Code § 27-2056.1: § 27-2056.1 Terminology.

For the purposes of this article, the term "multiple dwelling" includes a private dwelling where at least one dwelling unit within such dwelling is occupied by persons other than the owner of such dwelling or a member of such owner's family, provided, however, that the provisions of this article, other than section 27-2056.14, shall not apply to a dwelling unit that is occupied by such owner or a member of such owner's family.