I wanted to have fun with this one and spend a bit extra time detailing and rendering to make sure it was at a good quality.
This is a Dome Structure with multiple openings and second floor level with stairs acces and balconies.
This was exported in various formats.
Organized in layers for easy update
STL (Stereolithography, filesize: 2.09 GB), OBJ (OBJ, filesize: 571 Bytes), 3DM (Rhinoceros 3D, filesize: 18.5 MB), 3DS (3D Studio, filesize: 1.22 GB), DAE (Collada, filesize: 25.1 MB), FBX (Autodesk FBX, filesize: 548 MB), DXF (DXF, filesize: 12.4 MB), DWG (AutoCAD, filesize: 1.89 MB)