2006 New York Code - Size Of Rooms.

 
    §  214.  Size  of  rooms.  1.  In  every  tenement erected after April
  twelfth, nineteen hundred one, the sizes of living rooms shall meet  the
  following requirements:
    a.  In  each  apartment  there  shall  be  at  least  one  living room
  containing at least one hundred twenty square feet of clear floor  area,
  and  every  other  living  room  except a kitchen shall contain at least
  seventy square feet of clear floor area.
    b. Every living room which contains less than eighty  square  feet  of
  clear  floor area or which is located in the cellar or basement shall be
  at least nine feet high, and every other living room at least eight feet
  high; these measurements to be taken from  finished  floor  to  finished
  ceiling.
    c.  Every  living  room  shall have a least horizontal dimension of at
  least six feet and, if the tenement was erected after April  eighteenth,
  nineteen hundred twelve, of at least seven feet; except that the minimum
  horizontal  dimension  of  any  kitchen  and  of  a  maid's or servant's
  sleeping room in a fire-proof tenement in which one  or  more  passenger
  elevators are operated, shall be six feet.
    2. In any tenement, apartments containing three or more rooms may have
  dining  bays,  which  shall  not  exceed fifty-five square feet in floor
  surface area and shall not be deemed separate rooms or  subject  to  the
  requirements  for separate rooms or alcoves. Every such dining bay shall
  be equipped with such appropriate permanent fittings as may be  required
  by  the  department  and shall also be provided with at least one window
  opening directly upon a street or upon a yard or court which was  lawful
  on  April  eighteenth,  nineteen hundred twenty-nine.   The area of such
  window shall be one-eighth at least of the floor surface  area  of  such
  dining bay. No dining bay shall be permitted in any apartment containing
  less than three rooms.