Really great! One thing I might suggest is that while your structure has a sense of disorder/variety within it both as to space, utility layout and material/people conveyors, the very formal stacked pipes in the foreground and the trusses atop bother me. If it were me, I'd take one or two pipes and place them haphazardly on the ground or one placed on the other much akin to the stacked cmu's. Also, as to lighting, rather than one large spot from the foreground, how about a dozen bare utility, caged bulbes in random areas of the building, as well as a couple of floods here and there. Finally, how about some excavation at center, exposed utilities, construction signs, and piles of fill. manowar