Neighboring building is rotting

The building adjacent to mine is clearly exhibiting signs of decay: the siding is slowly peeling and falling onto my property, there is a giant hole near the ground where the siding had rotted away and wooden beams inside the house are clearly decomposing. This is also a probable rat entrance into their house. The building is a 4 story co-op with 6-8 units, I think. They cannot see the wall which I described, since it only faces my property, and they cannot access it unless they go through my house.
So my questing is: Am I required to alert them to the fact that their building is is need of urgent repair?
Also, I’d like to have them repair this wall because it is becoming quite an eye sore. Can I legally press them to take care of it?

By Sputnik13 |