N.Y. Multiple Dwelling Law § 13: Application of chapter to existing dwellings

§ 13. Application of chapter to existing dwellings. Any building

erected and occupied on or before April eighteenth, nineteen hundred

twenty-nine, or thereafter, as a tenement, which is not recorded as such

in the department, shall be required to comply with all the provisions

governing dwellings of like class or kind erected after such date.

Except as otherwise expressly required in this section and in sections

nine and twenty-five, subdivision six of section thirty-one, and

sections thirty-three, sixty-six and sixty-seven and in articles six and

seven, nothing in this chapter shall be construed to require any change

in the construction, use or occupancy of any multiple dwelling lawfully

occupied as such on April eighteenth, nineteen hundred twenty-nine,

under the provisions of all local laws, ordinances, rules and

regulations applicable thereto on such date; but should the occupancy of

any such dwelling be changed to any other kind or class after such date,

such dwelling shall be required to comply with the provisions of section

nine.