A Revit site element that carves a flat, level area into a toposurface for a building's foundation to sit on. A Building Pad carves a flat, level excavation into a Toposurface at a defined elevation, giving a building's foundation a proper level base to sit on instead of the surrounding terrain's natural slope - the site-modeling counterpart to a structural foundation, needed before the toposurface can be trusted for accurate cut/fill quantities.