When appraising a 2-4 unit residential property, an appraiser would measure and use gross building area.
The whole enclosed area of a floor or building, measured to a fixed surface or plane, or, in the case of overhangs and projects to the exterior surface of the building, to the outside surface of the building or structure's permanent exterior walls.
Gross construction areas can be found above, inside, or outside the building's boundaries. The core plant for the building, parking structures, and other buildings that are separate from the main building but are used by the main building may be situated in this area.
Among other features, this area might have mechanical rooms in the penthouses, subterranean facilities, open passages, tunnels, balconies, and overhangs. Unless a tenant is renting out the entire building.
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