Check out low poly prison building 3 Low-poly 3D model on CGTrader for $12. High-quality mesh by lukass12: 2600 polys, 2800 vertices. Textured, UV Mapped.
OBJ (OBJ, filesize: 74 MB), 3DS (3D Studio, filesize: 37 MB), BLEND (Blender, filesize: 93.9 MB), DAE (Collada, filesize: 37 MB), FBX (Autodesk FBX, filesize: 37.1 MB)