This could be a useful tool for a lot of folks.Two, so when the police did show up and informed these (ahem) rat bastard that they were trespassing how did that go down? 

I would not try to go down the road of policing their internal squabble.  

Obviously it is deceptive but better that than having the PC police down your back. 

I thanked her for informing me and called the police.

They are most assuredly policing the str's much harder than we expected!!

Police avoid the neighborhoods, no reasonable person would want to live there. 

I'm still awaiting the police reports.

Police won't get involved, it's a housing court matter. 

Call the police and report the theft.If you are able to take the tenant to court (small claims if under the limit in the jurisdiction) and obtain a judgement, then you can seek a garnishment of wages.

I am looking at a park that is pretty awful, which too me is exciting because I see lots of potential to take this poorly maintained commercial property and polish it up for some killer profit.