A. “Gross floor area” means the sum of the total horizontal areas of the several floors of all buildings on a lot, measured from the interior faces of exterior walls. The term gross floor area includes basements, elevator shafts and stairwells at each story, floor space used for mechanical equipment with structural head room, interior balconies, and mezzanines.

B. The gross floor area of structures devoted to bulk storage of materials including, but not limited to, grain elevators and petroleum storage tanks, shall be computed by counting each ten feet of height or fraction thereof, as being equal to one floor.

C. The term gross floor area shall not include cellars, or outside balconies that do not exceed a projection of six feet beyond the exterior walls of the building. Parking structures below grade and rooftop mechanical structures are excluded from gross floor area. (Ord. 871 §2 (part), 1989).