Thinking that most changes make no sense is the heart of the problem - it has led to inaction that then leads to overreach.  

Inaction will amplify it.  

As the winter season approaches, the housing market typically sees a decrease in activity.

You will learn a lot from taking action and lose a lot from inaction. 

Call the police and make it clear that their continued inaction is unacceptable. 

There are so many unknowns here that carry big dollar amounts (rehab needed) and aggravation (evicting tenants that have probably been living rent free while the foreclosure process has been in action).My guess, is you're going to "get what you paid for"....and then have to pay a lot more. 

But at the same time there aren't many active comparable rental properties nearby, which makes determining the market rent of a property difficult.I found that using rental listings that are inactive but were recently active provides me with a lot more data for determining market rent.To do this I go to the Zillow rent estimator tool and enter my property's address as well as a (very) rough estimate of the rent.

I see gross incompetence or a confirmation bias in action.

I think is not needed, and I think is also fair for the landlord not to loose interest and compensation from such actions (or inactions) of the tenants. 

I used to work under Walzelproperties.com since she charges a reasonable fee and understands investments.I have my license inactive for now and today I received an invitation to joinwww.5thstream.com, it looks like this broker is also an investor.They may work for you.Good luck.