{"building":{"gross_floor_m2":28.0,"name":"BIM.HOUSE Sample Building","ridge_height_m":3.2,"roof":"flat","stories":1,"structure":"wood (CLT-ready)"},"project":{"generated_at":"2026-05-09T00:00:00Z","generator":"Enabler / BIM.HOUSE","id":"bim-house-sample","name":"BIM.HOUSE Sample"},"schema":"IFC4_Add2","site":{"lat_dms":[35,40,0],"lon_dms":[139,46,0],"name":"Sample Site (Tokyo)"},"storey":{"elevation_m":0.0,"name":"GF"},"units":{"area":"SQUARE_METRE","length":"MILLI_METRE","volume":"CUBIC_METRE"},"validation":{"ifc4_compliant":true,"ifc_validator":"passes geometry-less Project+Site+Building hierarchy","tested_with":["FreeCAD 1.0","IfcOpenShell 0.7.0","Solibri Anywhere"]}}