Check out Low Poly Wooden Watch Tower 3D model on CGTrader for $6. High-quality mesh by PhilipStorm: 1140 polys, 1518 vertices.
STL (Stereolithography, filesize: 121 KB), OBJ (OBJ, filesize: 172 KB), UNITYPACKAGE (Unity 3D, filesize: 87.3 KB), BLEND (Blender, filesize: 1.13 MB), DAE (Collada, filesize: 272 KB), FBX (Autodesk FBX, filesize: 72.7 KB), GLTF (glTF, filesize: 162 KB), ABC (Alembic, filesize: 147 KB), C4D (Cinema 4D, filesize: 328 KB)