You mentioned financing and that can be done with nonrecourse loans (UDFI applies), but there is also an option to coinvest with someone that is not a disqualified person (lineal descendants).  

Have you requested the police report and is the son a resident at the property? 

Of course this comes with it's own share of problems, but the city of Pittsburgh police have added more presence there.

There are no executory contract police.

I am not giving you legal advice.The police and emergency services will be involved. 

Try calling your local police.  

The vhr permit has a 300$/yr fee, and is actively policed.  

The next calls will be all his workers and subs, do not pick up any blocked numbers.Make a police report, IF they will take it, they probably won't do it by phone.

Did they file a police report?

Yes this is definitely something I need to not only police myself on now, but continue to enforce on myself down the line.