Check out Medieval Building 55 Ruins Low-poly 3D model on CGTrader for $7. High-quality mesh by cg-duck: 5181 polys, 2810 vertices. Textured, UV Mapped.
FBX (Autodesk FBX, filesize: 53.7 MB), OTHER (Other, filesize: 53.7 MB), UNITYPACKAGE (Unity 3D, filesize: 54 MB)