Check the rents and stop by the Police department and share the address, so they can tell you about crime in the area.

Try reaching out to your local building department and ask them if there is a process or procedure for this. 

Your city's planning department will have a form to fill out or other method to communicate with AT&T's Engineering Department.

Starting a conversation up with the local Planning Department about your intended uses is a good place to start that can fill you in on the process or let you know where what you want to do might be acceptable.

If you observe  issues you can talk to your local police department for advice.

At the same time, if I dont buy an alternative, then I will never be able to depart with my expensive house that is a bad rental...

I then visited the local police substation and fire department.  

Hopefully you don't work for same employer or same department. 

If the initial attempt to reason and create rapport with the neighbor through neighborly conversation is unsuccessful, I'd consider sending a certified letter next so that it's on record, start the clock ticking on that if it does end up being an attorney situation, and make friends with the local code enforcement department officers. 

Make sure the bank has a commercial department and develop that relationship.