Architectural Pavilion Structure 7 sides 3D model is available on CGTrader for $22. Original author: modernarchstudio.
STL (Stereolithography, filesize: 150 MB), OBJ (OBJ, filesize: 408 MB), 3DS (3D Studio, filesize: 74.6 MB), DWG (AutoCAD, filesize: 74.9 MB)