Check out Zhangjiakou Hebei China 50km Low-poly 3D model on CGTrader for $49. High-quality mesh by CityArt. Textured.
C4D (Cinema 4D, filesize: 160 MB), OBJ (OBJ, filesize: 14.3 MB), FBX (Autodesk FBX, filesize: 11.3 MB), 3DM (Rhinoceros 3D, filesize: 7.91 MB), 3DS (3D Studio, filesize: 3.39 MB), STL (Stereolithography, filesize: 9.72 MB), DXF (DXF, filesize: 10.6 MB)