§ 25-141 Measuring Floor Area of Public Halls, Stairs, Fire-Stairs and Fire-Towers in Multiple Dwellings to Determine Lighting Requirements.
RCNY § 25-141
(a)To compute the square feet of floor area of public halls in multiple dwellings having an unenclosed stair, the floor area of the public hall and the horizontal area of the stair opening shall be added. At the lowest story, where there is an ascending flight of stairs but no descending flight of stairs, only the area of the actual flight of stairs shall be added to the floor area of such lowest story.
(b)To compute the square feet of floor area of a fire-stair or a fire-tower in a multiple dwelling, one-half of the horizontal area of such fire-stair or fire-tower, measured from the wall of the stair landing on one level to the wall of the stair landing on the next level, shall be deemed to be the floor area at each such level.
(c)Where the light from the fixture at the highest story provides adequate illumination, in the opinion of the department, no lighting fixture shall be required at the roof level of the stair bulkhead.
