Thanks, Lukasz! The light set up is fairly simple. I have one sun lamp set to a mild yellow/white color with an energy level of 1.0. Then I have 8 standard lamps in a circle around the model all set to a mild blue color with an energy level of 0.3 each. Have only the sun lamp cast shadows.
Thanks, Slèpnyrl! You are correct and I have spent more time creating textures than using blender.
I have been using a vector based program to create a gray scale bump map based on the uv layout. I like to start with vectors so I do not have to worry about final image resolution. I export the bump map as a high res (4096x4096) image. Using the bump map as a guide in phototshop, I select and fill in the brick, concrete, and metal in the appropriate areas saving the image as a color map. I use the bump map as a guide to create alpha and reflection maps as well. I make reduced copies of all maps for use in blender.
Yes, the windows are reflecting the evironment and have a slight alpha to them. Right now there is little to reflect but a blue sky and a gray ground plane. The windows will look better with an improved environment.