There is map to make it reflective in certain parts, it's the spec map, when you assign your attributes to make your reflection you use a specular to control your amount you want to reflect. If you use a texture on the specuar it will work, but I didn't do it that way, the windows are a separate peice. Each building took about five minutes to make (excluding the objects on the roof), and the ground level was made quickly, the main thing was making the buildings.
Also noump map was used on the buildings, If can't tell, save the picture and open it of in a veiwer, the picture is alot bigger then