This 3D model was originally created with Sketchup 8 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 I guess I will make some more of them. Here it is, the billboard I will use for my city of the dream. Pretty detailed, has windows, not a component (except right after download directly into SketchUp), has a default billboard design. You can delete the Your add here thing and put your idea there, so you can delete the corners also. The easiest billboard on the warehouse I guess :).
STL (Stereolithography, filesize: 23.9 KB), OBJ (OBJ, filesize: 14.6 KB), 3DS (3D Studio, filesize: 17.4 KB), DAE (Collada, filesize: 34.2 KB), FBX (Autodesk FBX, filesize: 26 KB), IGE (IGES, filesize: 299 Bytes), MAX (Autodesk 3ds Max, filesize: 41.5 KB), SKP (Sketchup, filesize: 17.1 KB), OTHER (Other, filesize: 13.4 KB)