Here's what it says:
"To those of you who disrespectfully leave your trash, broken glass and empty bottles on the roof, you are being monitored. Your cans clogged a drain which flooded the apartments next door during last week's rain. You are disgusting to let Jose and the other super clean up after your messes. Surrounding neighbors are complaining about you every week and are ready to comply with management and law enforcement and photograph you during your next rooftop excursion. Since you can not the enjoy the roof like respectable adults, we request that you stay off of it. Your skateboards are ruining the rooftop material, weakening it."
Stay off the roof or suffer consequences.
— Management, tenants.
Given the "fuck you all" written over the note, I'm guessing 440 hasn't seen the last of the rooftop skateboarding bashes.