Primarily used in real estate and construction to refer to the total floor area of a building, often measured in tsubo. The gloss 'esp. Of the ground floor only' is a usage note; in practice, it can refer to total floor area, but context may specify ground floor.
延べ坪 refers to the total floor area of all floors combined, while 建坪 often emphasizes the building's footprint or ground floor area, though usage can overlap.
