N.Y. Multiple Residence Law § 259: Cellar and basement stairs

§ 259. Cellar and basement stairs. A cellar or basement stair located

inside the dwelling shall be entirely enclosed with fireproof walls and

be provided, at all openings, with fireproof doors and assemblies, with

the doors self-closing, except that in any dwelling three stories or

less in height, such stair may be enclosed with walls or partitions

constructed of fire-resistive materials.