Check out Washington DC USA - city and urban 3D model on CGTrader for $3. High-quality mesh by JindaArch.
BLEND (Blender, filesize: 146 MB), OBJ (OBJ, filesize: 159 MB), FBX (Autodesk FBX, filesize: 74.7 MB), MAX (Autodesk 3ds Max, filesize: 270 MB), DAE (Collada, filesize: 260 MB), DXF (DXF, filesize: 568 MB), STL (Stereolithography, filesize: 92.9 MB)