Definitions for "Gross building area"
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.