Check out Outpost Model with Underground Base Low-poly 3D model on CGTrader for $12. High-quality Polygon mesh mesh by CraftedIn3D: 224466 polys, 112498 vertices. PBR, Textured.
SKP (Sketchup, filesize: 76.3 MB), BLEND (Blender, filesize: 87.7 MB), OBJ (OBJ, filesize: 24.9 MB), FBX (Autodesk FBX, filesize: 70.3 MB), GLTF (glTF, filesize: 72.3 MB), TEXTURES (Textures, filesize: 51.7 MB), JPG (JPG, filesize: 51.7 MB), PNG (PNG, filesize: 51.7 MB), DAE (Collada, filesize: 28.6 MB), STL (Stereolithography, filesize: 42.3 MB)