N.Y. MDW Law § 140

§ 140. Application of article five. The provisions of this article\nshall apply to non-fireproof multiple dwellings erected after April\neighteenth, nineteen hundred twenty-nine, and to such dwellings only.\nThey shall apply to all such non-fireproof dwellings unless their\napplication is expressly limited to dwellings of a particular class.\nThey shall apply in addition to, and not in substitution for, the\nprovisions of article three. However the provisions of this article\nshall not apply to a multiple dwelling three stories or less in height\nto be occupied by not more than three families in all, with a maximum\noccupancy of two families on each floor in a two story building and one\nfamily on each floor in a three story building, provided however that\nall the provisions of article six are complied with, including section\none hundred seventy-a of said article.\n