construction area
The total amount of built floor space occupied by solid structural elements like columns, walls, and doors.
The construction area of a built object is the amount of its built surface area, added cumulatively over all floor levels, which it taken up by fixed structural elements such as columns, walls, doors, fixed partitions, pipes, etc. The figure is a component of gross floor area but is NOT included in usable floor area.
An area is only comparable alongside the standard it was measured to. National measuring codes differ over balconies, atrium voids and shafts, so two published figures for one building can both be correct.
A figure that covers a complex rather than a single building is a different measurement again. Where a tower shares a podium, the record has to say whether the podium is inside the figure.