Finger and Toe Models have released a 28mm paper terrain Warehouse kit.
From their announcement:
Finger and Toe Models announces the release of the 28mm card stock Warehouse in four colors with a removable roof, loading dock, and office shed. Every town has a run-down district where the police are cautious and tourists discouraged. Build an entire warehouse district for a pittance for your 28mm tactical skirmishes, whether gangs, SWAT, special ops, or repelling the alien invaders who clearly took a wrong turn.
Remember, every Finger and Toe model comes with smoosh assurance: if ya’ll smoosh your Warehouse, a new set waits your summons from hard drive and printer.