Check out Carved Stair 06 Black Low-poly 3D model on CGTrader for $15. High-quality mesh by shabnam3dart: 209616 polys, 223758 vertices.
MAX (Autodesk 3ds Max, filesize: 24.2 MB), OBJ (OBJ, filesize: 19.8 MB), FBX (Autodesk FBX, filesize: 10.5 MB), STL (Stereolithography, filesize: 29.8 MB)