{"design":{"construction_jpy":38000000,"floors":2,"gross_floor_m2":200.0,"rooms":"1F LDK 60㎡ + 暖炉 + マッドルーム + ゲスト寝室、2F メイン寝室 + 書斎×2 + ロフト + 屋上テラス","structure":"SIPs (壁 200mm) + 杉 CLT 床 (90mm) + 籾殻断熱 200mm + 三層 Low-E 木製サッシ / UA 0.14 (HEAT20 G3+)","title":"SOLUNA BUILD L — 200㎡ リトリート","total_jpy":38000000},"files":{"ifc":"/api/showcase/soluna-build-l/bim.ifc","image":"/api/showcase/soluna-build-l/image","json":"/api/showcase/soluna-build-l/bim.json"},"schema":"BIM.HOUSE Real Listing v1","site":{"address":"北海道川上郡弟子屈町美留和 周辺 (拡張プラン)","land_area_m2":2000.0,"land_price_jpy":0,"lot_d_m":50.0,"lot_w_m":40.0,"zoning":"都市計画区域外"},"source":{"fetched_at":"2026-05-10","type":"SUUMO public listing","url":"https://solun.art/build"},"validation":{"geometry_includes":["Project + Site + Building hierarchy","2 storeys with slab + 4 walls each","1 entrance door (south wall, ground floor)","IfcRelContainedInSpatialStructure links per storey"],"ifc4_compliant":true,"tested_with":["FreeCAD 1.0","IfcOpenShell 0.7.0"]}}