Definitions

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• Gross floor area definition

  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 of six feet, six inches or more; penthouses, attic space, whether or not a floor has actually been laid, providing structural head room of six feet, six inches or more; interior balconies; and mezzanines. 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. The term gross floor area does not include cellars or outside balconies which do not exceed a projection of six feet beyond the exterior walls of the building. Parking structures below or above grade and roof top mechanical structures are excluded from gross floor area.

• Net floor area definition

  Net 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 and from the centerline of walls separating two or more buildings. The term net floor area shall include outdoor display areas for the sale, rental and display of recreational vehicles, boats and boating equipment, trailers, horticultural items, farm or garden equipment and other similar products, but shall exclude areas designed for permanent uses such as toilets, utility closets, malls enclosed or not, truck tunnels, enclosed parking areas, meters, roof top mechanical structures, mechanical and equipment rooms, public and fire corridors, stairwells, elevators, escalators and areas under a sloping ceiling where the head room in 50 percent of such area is less than six feet, six inches.