01-15-2011, 03:52 PM
Those buildings are concrete tilt up type. If you are modeling unpainted versions they should be about the same color as your concrete street pavement without any "grease" spots. Often companies will paint a stripe or band of color somewhere on tilt up buildings to give it a little character. They will often have the company name or logo on the side of the building as well, but most likely the decorations and logo will be on the side facing the street rather than the side facing the tracks.