wtf is going on with the top of that cornwell building?
Also you have a horrible mismatch of styles going on there. Bricks, cinderblocks, concrete, wood, blue metal, red metal, all going on within the same field of view. It's visual yuck.
But anyway, on to the question you asked:
The metal panels light from one side only, because they're a single sheet of polygons and not actual doublesided. So you need to change "Ignore surface normal for computing vertex lighting" to "yes" in the keyvalues. Also, "Disable Self-Shadowing with vertex lighting" might be necessary, but I am less certain about that.
Oh, neither of those will do
anything if you're not compiling with vertex lighting. So if you're not doing that, you should be (for at very minimum, your final compiles) If for quick testing you don't use vertex lighting, don't worry about the incorrect shadowing.
Learn you some stuff