N.Y. MRE Law § 258

§ 258. Public halls. 1. Every public hall shall be everywhere at least\nthree feet in clear width.\n 2. Except as herein provided, every public hall shall be completely\nenclosed with fireproof floor, ceiling and walls, and separated from\nevery stair by fireproof partitions or walls, and all doors and their\nassemblies opening therefrom shall be fireproof, with the doors\nself-closing and without transoms. In a dwelling three stories or less\nin height occupied by not more than four families on each story, or in a\npermanently occupied dwelling or any section thereof two stories or less\nin height, any such hall which furnishes access to only one stair need\nnot be separated from such stair by any partition or door and the walls\nof a public hall may be fire-retarded and the floors may be provided\nwith three inches or more of incombustible materials between the beams.\n 3. Except in dwellings three stories or less in height and occupied by\ntwo families or less on every story, every public hall shall have at\nleast one window opening directly upon a street or upon a lawful yard or\ncourt. There shall be such a window at the end of such hall and at right\nangles to its length, with an additional window in each forty feet of\nhall or fraction thereof beyond the first sixty feet from such end\nwindow; or the hall shall have one window opening directly upon a\nstreet, yard or court, in every forty feet of the length of such hall or\nfraction thereof measured from one end of the hall. Any part of a public\nhall that is shut off from any other part of such hall by a door or\ndoors shall be deemed a separate hall.\n 4. The foregoing provisions of this section with regard to lighting\nand ventilation shall not apply to a vestibule or other public hall\nwhich serves as a means of access from one or more apartments opening\nthereon to a fire-stair meeting the requirements of section two hundred\ntwo if such vestibule or public hall is lighted and ventilated as\nrequired by sections one hundred nine and two hundred seven.\n