The file is created in Blender; inside, you will find furniture, lighting items, and accessories.
Native Formats: BLEND (Blender, filesize: 48.7 MB)
Exchange Formats: OBJ (OBJ, filesize: 43.9 MB), FBX (Autodesk FBX, filesize: 59.6 MB), STL (Stereolithography, filesize: 48 MB)