Section 27-2044. Fire protection in certain old law tenements

a. In every
  old law tenement which is less than four stories in height:
    (1) Every door opening into any entrance hall or stair,  or  into  any
  public  hall  connected  therewith,  shall be self-closing; every glazed
  opening or glazed panel in such a door shall be glazed with wire  glass,
  and every transom opening upon any public hall shall be glazed with wire
  glass firmly secured in a closed position; and
    (2) Every interior sash, or opening other than a door, in the walls or
  partitions  of  any  such  hall,  and  every window in any such hall not
  opening to the outer air, shall be removed and the  openings  closed  up
  and fire-retarded; and
    (3)  The  ceiling  of  the  cellar,  or  if there is no cellar, of the
  basement or other lowest  story,  shall  be  fire-retarded  unless  such
  ceiling  already  has been plastered or covered in a manner satisfactory
  to the department with plasterboard or  gypsumboard  at  least  one-half
  inch in thickness.
    b. In every old law tenement which is four stories or more in height:
    (1) On all stories above the third story, every apartment door opening
  into  any stair or into any public hall connected therewith, unless such
  stair or public hall is protected by an approved sprinkler system  shall
  have a fire resistance rating of at least one hour. Existing door frames
  in good condition may be retained. All such doors shall comply with this
  requirement,   not   later   than   November  second,  nineteen  hundred
  seventy-three.
    (2) For all stories below the fourth story,  any  application  for  an
  alteration  permit  for alterations to be made in an apartment below the
  fourth story shall  include  the  provision  that  every  door  of  such
  apartment  opening into any entrance hall, stair or into any public hall
  connected therewith, unless such entrance hall, stair or public hall  is
  protected  by an approved sprinkler system, shall have a fire resistance
  rating of at least one hour. Existing door frames in good condition  may
  be retained.
    (3)  Where apartment doors having a fire resistance rating of at least
  one hour are required, every transom opening  upon  any  entrance  hall,
  stair   or   public   hall  connected  therewith  shall  be  sealed  and
  fire-retarded. All other transoms opening upon any entrance hall,  stair
  or  public  hall connected therewith shall be glazed with wire glass and
  permanently sealed in a closed position.
    (4) All doors opening into any entrance hall, stair or into any public
  hall connected therewith shall be self-closing; every glazed opening  or
  glazed panel in such a door shall be glazed with wire glass.