New York City Graffiti Laws
No person shall write, paint or draw any inscription, figure or mark of any type on any public or private building or other structure or any other real or personal property owned, operated or maintained by a public benefit corporation, the city of New York or any agency or instrumentality thereof or by any person, firm, or corporation, or any personal property maintained on a city street or other city-owned property pursuant to a franchise, concession or revocable consent granted by the city, unless the express permission of the owner or operator of the property has been obtained.