2006 New York Code - Alcoves.

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