All enclosed floor areas, as measured along a building's outside perimeter.
The total floor area in an office building measured in square feet or square meters that is associated with that building's use as office building. The area extends to the outer surface of exterior walls and windows and includes office area, retail area, and other rentable areas such as vending machine space and storage area, but excludes parking and roof space.
The total floor area of a building, including below-grade space but excluding unenclosed areas, measured from the exterior of the walls.
A term used by federal agencies to measure multi-family properties. Also used in reference to industrial buildings. Similar to Gross Area.
The total square footage of every floor of a building, starting with the outside edge of exterior walls. Basements and mezzanines are included; balconies are normally excluded.
The total floor area of the building measuring from the outer surface of exterior walls and windows and including all vertical penetrations (e.g. elevator shafts, etc.) and basement space.
The sum of areas at each floor level, including basements, mezzanines, and penthouses included within the principal outside faces of the exterior walls and neglecting architectural setbacks or projections. (Institute of Real Estate Management)