N.Y. Multiple Residence Law § 52: Public halls and stairs

§ 52. Public halls and stairs. The walls and ceiling of every entrance

hall, stair hall or other public hall, every hall or passage not within

an apartment or suite of rooms, every dumbwaiter, elevator, and, every

other shaft, including stairs, connecting more than two successive

stories, shall be sealed off from every other portion of the dwelling

with fire-retarded materials, or, in lieu thereof, except in the case of

elevator shafts, shall be equipped with an automatic sprinkler system.

Except as provided in subdivision five of section fifty-five, nothing

contained in this article shall be deemed to exempt an interior required

means of egress from the enclosure requirements or the equipment

provided for in this section. A fire-detecting system shall not be

acceptable for any of the requirements of this section.