Always encourage the reporting tenant to call the police (they can remain anonymous) 

That is the anonymity of the interweb.Additionally on this forum you are dealing with a lot of people that have developed leather tough skin from repeatedly having to deal with a hole tenants.

All properties need to be in trust to provide anonymity and transfer ability without re titleing asset.

Anonymity does have it's benefits, though, if you can achieve it.

Trusts, other corps and LLCs cannot be shareholders, so people who are trying to gain anonymity are unable to do so as at least one natural person shareholder needs to be registered with the Secretary of State (in most states).There are several additional reasons, but honestly you could write a book about it.  

I would call the police and report anonymously if you don't want to be involved.

I am still learning about trusts, but from what i have read, you can use a trust name to be anonymous.

Alex, it is probably a contract issue you might look at with the pm if you want that in your agreement, and it may not be a great practice for the pm to do this , especially if you use a pm to avoid this very issue and have anonymity.

When I post ads on craigslist, I have 4 or 5 questions at the bottom that need answered and I only use the anonymous e-mail at first.  

He basically admitted to owning all these homes under anonymous LLC's and talked about being down in the hood every day keeping up on things.