In practice the BPP line is where a commercial claim is won or lost. A building is measured by a contractor against a scope; contents are measured only by someone who counted them. On a manufacturing loss that means CNC machines, presses and tooling; in retail it is saleable stock, refrigeration and point-of-sale hardware; in a restaurant it is the cook line, walk-in contents and the smallwares nobody counts from memory.
Policies insure BPP separately from the structure and frequently apply sub-limits to particular categories, so what is recorded and how it is described changes the recovery. See BPP inventory and on-site inspections.