I'll try to add more decals to the concrete, maybe some different concrete textures or security posters (to follow the industrial theme) instead of more stains, I don't want everything in the scene to be covered in dirt.
Agree with the above comment. Really solid, but lighting could be more dramatic and defined to really make the level look great. Some of the bare concrete such as the roof beams could also use a little more variation. Perhaps other props or decals.