N.Y. Multiple Dwelling Law § 106: Cellar and basement stairs

§ 106. Cellar and basement stairs. A cellar or basement stair may be

located inside the dwelling, but shall not be located underneath a stair

leading to the upper stories unless it is a basement stair leading

upward from a basement which is the main entrance story of the dwelling,

or unless it is a stair leading downward from the entrance story which

is separated by a fireproof arch from the stair leading upward from the

entrance story. Except as otherwise provided in subdivision five of

section fifty-two, all inside cellar or basement stairs shall be

entirely enclosed with fireproof walls and be provided with fireproof

doors and assemblies, with the doors self-closing, at all openings.