Hi Dimus. Thank you for your assistance and recommendation. I value your input.
You're right, it definitely needs more attention to detail to be more realistic. Your email helped me out quite a bit as you see, otherwise I would still be seeing a black building!
....I haven't yet messed with the windows due to finishing other missing areas. Hand rails for the stair case, and a few other goodies inside. I might even model up some hanging shop lights. Although recessed lights are more practical. I know nothing about night textures,but, night lighting also comes to mind, along with the shadowing you mention.