Floor space in a building allocated to corridors may be exempted from floor area pursuant to the provisions of paragraphs (a) or (b) of this Section. Such provisions may be applied individually or in combination.

1. Corridors Termination
   
   Fifty percent of the floor space of a corridor may be exempted from the definition of floor area where one of the following criteria are met: 
   1. the corridor provides direct access to outdoor space on a balcony or terrace on the same story that is accessible to residents of the story;
   2. the corridor has daylighting through windows with a glazed area of at least 20 square feet, and such windows are located:
      1. directly within the corridor;
      2. in the enclosing walls of a stairwell along such corridor, and access to such stairwell from the corridor is provided through an entry door assembly with a minimum glazed area of at least 16 square feet; or 
      3. within common space along such corridor that accessible to residents of the story; or
   3. the corridor terminates with a dwelling unit that contains at least three bedrooms.
2. Length of Corridor
   
   Fifty percent of the floor space of a corridor may be exempted from the definition of floor area, where the length of the corridor, as measured from the elevator core to the door of the furthest dwelling unit on the story, does not exceed 100 linear feet.