N.Y. Multiple Dwelling Law § 190

§ 190. Cellar stairs. 1. Except as provided in paragraph g of\nsubdivision three of section one hundred seventy-one, and except as\notherwise provided in subdivision two hereof, every stair leading from a\ncellar to the floor above shall be constructed of incombustible\nmaterials, shall have closed risers, shall be completely enclosed with\npartitions of incombustible materials and shall be equipped at the\nbottom with a fireproof door and assembly with the door self-closing.\n 2. Every existing stair leading from a cellar to the floor above in a\nconverted dwelling accepted or approved by the department on or before\nJuly first, nineteen hundred sixty shall be deemed in compliance with\nthis section.\n