There is a curtain object in the file. (Walls, ceilings, floors, etc. are for preview only)
Done unwrap and retopology
render: vray, coronaexport: fbx-vray, fbx-corona , objpolys: 66758verts: 68352
OBJ (OBJ, filesize: 1.37 MB), TEXTURES (Textures, filesize: 19.2 MB), MAX (Autodesk 3ds Max, filesize: 4.67 MB), FBX (Autodesk FBX, filesize: 4.62 MB)