N.Y. Multiple Dwelling Law § 215

§ 215. Alcoves. No part of any room shall be enclosed or subdivided,\nwholly or in part, by a curtain, portiere, fixed or movable partition or\nother contrivance or device unless each such enclosure or subdivision\nshall contain a separate window conforming to the provisions of section\nthirty for rooms in multiple dwellings erected after April eighteenth,\nnineteen hundred twenty-nine, and have a clear floor area of at least\nseventy square feet.\n