Ground-floor level (local y).
Footprint centroid.
District.
Main door.
Storeys.
Ground-floor outline of the main volume (frame-local).
Wall height above the base, metres.
Building id.
Lot id.
Wall material.
Estimated residents.
Main roof shape.
Style.
Landmark (church, town hall, water tower) or farm building (farmhouse, barn, silo, machine shed), or null.
A building as plain data.