At the last TCA York show, I purchased from Korber Models two new front wall kits. These are the newly acquired Pecos River tooling. What I like about these kits is that they are modular and you can build the kit to fit the area that it will end up at. Both were painted with Rustoleum textured paint in tan to give a rough concrete look and then lightly with flat black to dirty them up a bit.
The two kits were the Double A Plastics and Kendall Manufacturing.
Here they appear on the layout. The loading dock was scratched built. The windows had
frosted glass spray applied to them so the wall behind them would be less noticed.