I'd call up the police precinct that serves that particular neighborhood and get their impression.

The police will not assist in any way as they consider landlord/tenant issues a civil matter.

Than the fact that the friend told you upfront what was going on is another plus.I would write down any concerns you have- neighbors, noise, damage, etc. and state that you will allow it if these added rules are followed or the friend has to go- ie- any police calls etc. 

@Cole Schlack  I just can't agree with your train of thought when the city council levies fine its a code enforcement action that will be a lien on the property if not paid.. just like you see in many bigger cities were code enforcement tags houses for waste and wrecked cars etc. its a huge issue in most cities I know our city of PDX for sure.And my daughters mother in law is a code endorsement officer in San Jose they have police powers. 

Can anyone provide information relative to the policing of activity in a SDIRA/LLC arrangement?

If it did not happen online, I would contact your local police department to see what they recommend. 

My grandpa was NY police officer for 37 years.

I can go on with other problems they are causing but im looking for a solution.I went to the police but they can only do so much according to them.

No progress had been made with repairs because the police department has not come out to file the police report.After the police came out 4 weeks after the burglary, renovations began again.

I had to call the police and he told them he wanted to die and wanted to kill himself.