Built-up area plus a share of the building's common areas, such as the lobby, lifts and stairs. Also called super area; the largest of the three.
Guide
Three numbers describe the same flat and only one of them is floor you can stand on. How they differ, and which to ask for first.
A shared lobby or clubhouse is real, but you do not live in it. Divide the price by the carpet area to see what you pay for each usable square foot.