New York Multiple Residence Law Section 30 - Cellar ceilings.

 30. Cellar ceilings. In every such dwelling three stories or more in
  height  the ceiling of the cellar, or of the lowest story if there be no
  cellar, shall be fire-retarded, or be equipped with a sprinkler  system,
  unless  such  ceiling  has already been plastered to the satisfaction of
  the department.

Last modified: February 3, 2019