It wasn't specifically mentioned in this article, but in another article, it indicated that the posters had been posted on the wall of a private property building either by the owner of that property or by permission of the property owner. Tearing down someone else's property on a private building is still criminal, as far as I know.
And it also said where these IMBECILIC kids are from and it's NOT Gramercy Park nor the neighborhood around it!
For those who do not know, Gramercy Park is just four blocks, north, south, east and west that surround a beautiful gated PRIVATE park, which is kept locked and ONLY those who pay a yearly fee, for a key, and their guest are allowed to use it! It is a mix of co-ops, apartment rental buildings, private brownstones, the famous hotel and restaurant AND the PRIVATE club for people connected to the theatre, known as THE PLAYERS CLUB,that Edwin Booth founded in 1888. That's it...that's the extent of Gramercy Park!
I don't know what it's like now, but it was a lovely place to live, when we lived there.
Margaret Hamilton lived across the street from me ( she was a lovely lady! ), and Helen Hays and Mildred Natwick filmed outdoor scenes, in the T.V. series THE SNOOP SISTERS, on the West side of the block, where the AMAZING Victorian Brownstones were located.