Русско-англо-русский юридический словарь

“Construction in progress” is an accounting term that refers to a company asset or assets that are not usable or sellable because they are in the process of being built or assembled. (smallbusiness.chron.com)

Net internal area (NIA) (or usable floor area UFA) - The NIA is the GIA less the floor areas taken up by lobbies, enclosed machinery rooms on the roof, stairs and escalators, mechanical and electrical services, lifts, columns, toilet areas (other than in domestic property), ducts, and risers. (Wikipedia)

Habitable floor means any floor usable for living purposes, which includes working, sleeping, eating, cooking or recreation, or a combination thereof. A floor used only for storage purposes is not a "habitable floor." (Law Insider)

Gross Area. The sum of all areas on a floor of a building included within the outside faces of its exterior walls, including all vertical penetration areas, for circulation and shaft areas that connect one floor to another. Gross Area = Net Usable Area + Structural Space. (Glossary of Terms In Administrative Data and Reports)