The total enclosed area of a floor or building measured to the inside surface of the permanent exterior walls of the building or structure or to a predetermined surface, or plane as in the case of overhangs and projections to the outside surface of the building. Gross Area may include areas above, below, or outside boundaries of the building in the case of central plants, parking structures and other structures separated from the main building that are used by the main building. This area may include areas as penthouse mechanical rooms, basement services, exterior corridors, tunnels, balconies, overhangs, central plants, mechanical within the parking structure, or other buildings separated from the main building but used by the main building.
Generic term, usually to mean the total of all enclosed floor areas of a building, including basements, measured to the outside face of enclosing walls.
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