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Gross Area
The total floor area of the structure within the outside faces of the exterior walls.
Net Assignable Area
The sum of all areas on all floors of a building assigned to, or available for assignment to, an occupant or use, excluding spaces defined as building service, circulation, mechanical, and structural areas. This is also referred to as NASF.
Net Usable Area
The sum of all areas on all floors of a building either assigned to, or available for assignment to, an occupant or specific use, or necessary for the general operation of a building.