Fire escapes shall not constitute any part of the required means of egress in new buildings.
Existing fire escapes shall continue to be accepted as a component in the means of egress in existing buildings only.
New fire escapes for existing buildings shall be permitted only where exterior stairways cannot be utilized due to lot lines limiting stairway size or due to the sidewalks, alleys or roads at grade level. New fire escapes shall not incorporate ladders or access by windows.
Fire escapes shall comply with this section and shall not constitute more than 50 percent of the required number of exits nor more than 50 percent of the required exit capacity.