Section 27-2059. Lighting and ventilation of living rooms in converted dwellings

a. Required windows. Except as  provided  in  subdivision  c,  every living room in a converted dwelling shall have at least one window
  opening on:
    (1) A street,
    (2)  A  yard  or  outer  court  which  complies with the provisions of
  section one hundred seventy-two of the multiple dwelling law, or
    (3) An inner court or shaft with minimum  dimensions  of  three  feet,
  nine inches in width and eight feet in length.
    For  a  room  located  on  the top story, a skylight of the dimensions
  required in subdivision b may be substituted for a window.
    b. Size of windows. (1) The total area of  all  windows  in  the  room
  shall be at least one-tenth the floor area of such room.
    (2)  Every required window or skylight shall be at least twelve square
  feet, except that if the total area of windows in the room is one-eighth
  of the floor area this requirement shall not apply.
    (3) At least one-half of every required window shall open. One-half of
  the skylight shall have ventilating openings, unless (a) the skylight is
  equipped with a minimum of one hundred and forty-four square  inches  of
  ventilation,  and  (b) there is at least one window in the room, and (c)
  the combined glazed  area  of  the  skylight  and  window  is  at  least
  one-eighth of the floor area.
    (4)  The  top  of  every  required window shall be at least seven feet
  above the floor, except that on the top story it shall be a  minimum  of
  six feet above the floor.
    c.  Noncomplying  rooms.  (1)  A  room  which is noncomplying with the
  minimum room size requirements of subdivision b of  section  27-2074  of
  article four of this subchapter or with the requirements of subdivisions
  a  and  b  of this section may not be occupied unless it has a single or
  unbroken opening of not less than thirty-two and  one-half  square  feet
  into  an  immediately  adjoining  room. Such adjoining room shall have a
  window on a street or a yard  which  complies  with  the  provisions  of
  section  one  hundred  seventy-two  of the multiple dwelling law, except
  that if the dwelling is two stories or less in  height,  the  window  of
  such  adjoining room may open on an outer court or a court not less than
  four feet in width extending from street to yard.
    (2) No room may be subdivided in any  manner  unless  each  subdivided
  portion  meets the requirements of paragraph one of this subdivision, or
  of subdivision a of this section.