Check out Square Heliport 3D model on CGTrader for $79. High-quality mesh by flugaria: 704343 polys, 678902 vertices. Textured, UV Mapped.
C4D (Cinema 4D, filesize: 5.06 MB), OBJ (OBJ, filesize: 25.7 MB), FBX (Autodesk FBX, filesize: 8.68 MB), 3DS (3D Studio, filesize: 7.66 MB), STL (Stereolithography, filesize: 11.2 MB), TEXTURES (Textures, filesize: 654 KB)