interior wall thickness
The median distance between the two opposite finished sides of a wall dividing the interior of a building.
The interior wall thickness of a building is the median distance between the two opposite finished surfaces of a wall that divides the interior of a building. Included in the thickness is any structural framework, non-load-bearing wall framework, interior wall coating, plumbing, wiring, or mechanical ducts.
The thickness of a perimeter wall should be listed as the exterior wall thickness.
The value is a median across the whole object and not a figure taken from one place. A tower normally has thicker walls low down than high up, so a number read off a single detail drawing answers a different question than this field asks.
Where a building has two clearly different constructions, such as a podium and a tower, each is described on its own record rather than averaged into one value.