I don't know if you're aware of the Five Pointz project. Five Pointz was a legitimate forum for street artists from around to world to display their work. The owner of the building destroyed the work, without notice. He was sued and was just ordered to pay a $6.7 million judgment for damages. https://ny.curbed.com/2018/2/12/17005324/5-pointz-lawsuit-graffiti-artist-settlement.