“Net floor area” means the gross floor area as defined in Section 19.08.203, less the following: toilets, building service and equipment rooms, storage rooms, parking and garage areas, unoccupiable roof penthouses used for equipment, service or exits, exterior unoccupiable areas, building circulation (stairs, elevators, lobbies, and permanently enclosed corridors that are not occupiable). (Ord. 89-1 § 1, 1989.)