ยง 274. Fire-escapes erected before October first, nineteen hundred and
  thirteen.   All  outside  fire-escapes  erected  before  October  first,
  nineteen hundred and thirteen, and serving as required exits  under  the
  provisions  of  section two hundred and seventy-one shall conform to the
  following requirements:
1. There shall be balconies on each floor of  the  building  connected
  with stairways placed at an angle of not more than sixty degrees.
2.  A  stairway  shall  lead  from  the top floor balcony to the roof,
  except when the fire-escapes are erected on the front of the building.
3. A stairway not less than twenty-two inches wide shall lead from the
  lowest balcony to a safe landing place  beneath,  which  stairway  shall
  remain  down  permanently  or  swing  up  and  down  by counterbalancing
  weights.
4. A safe and unobstructed exit shall be provided to the  street  from
  the foot of such fire-escapes as required in subdivision nine of section
  two hundred and seventy-three.
5.  Steps  shall  connect  the  sill  of  every opening leading to the
  fire-escapes with the floor wherever such sill is more than  three  feet
  above the floor level.
6.  All  openings  leading  to the fire-escapes shall be provided with
  fireproof windows or fire doors.
7. All windows opening upon the course of  the  fire-escape  shall  be
  fireproof windows.
Structure New York Laws
260 - Incombustible, Fireproof and Fire-Resisting or Fire-Resistive Material.
262 - Fireproof Window or Fire Window.
263 - Fireproof Partition or Fire Partition.
266 - Exterior Enclosed Fireproof Stairway.
268 - Exterior Screened Stairway.
269 - Application of Provisions.
270 - Construction of Buildings Erected After October First, Nineteen Hundred and Thirteen.
271 - Requirements for Buildings Erected Before October First, Nineteen Hundred and Thirteen.
272 - Additional Requirements for All Buildings.
274 - Fire-Escapes Erected Before October First, Nineteen Hundred and Thirteen.
275 - Special Laws and Local Ordinances.
276 - Inspection of Buildings and Approval of Plans.
277 - Notice of Issue of Local Construction Permit.
278 - Limitation of Number of Occupants.
279 - Fire Alarm Signal Systems and Fire Drills.
280 - Automatic Fire Extinguishing Systems.