This is the Fourth Street Bridge, overpass, underpass or viaduct in downtown LA near the Los Angeles River. It has been modelled from a stock photo. I used this overpass bridge model in a hot rod car chase scene originally. It has a dirty, gritty, urban, inner-city or film noir look. The overpass was built in 1931. It exhibits a range of architectural styles, from Beaux Arts in its four concrete towers to Gothic Revival in its porticos, lighting standards and railings. The 3d model is 143,000 quad polys/faces so it’s fine for close up or 4k renders. Some of the bevelling could be taken off for a low-poly version.
The .3ds and .blend files have basic phong materials with texture maps attached, the .mb file has full v–ray materials. The .glb file has PBR materials applied.