It sat out in the middle of nowhere. Empty, abandoned, it was representative of the whole town. Few people remained, but what was left of this little strip mall still got quite a bit of attention.
Graffiti artists plied their trade without fear of legal trouble. No one cared. The building had been covered, painted over, repainted so many times that there was no way of knowing how it had looked originally.
Messages in code were left. The occasional foul language was quickly painted over. Sometimes, artists worked together to create murals.
There was no harm done.