In a few words, he is a 50-something single man with what looks like a somewhat unstable mental condition (bipolar maybe?

If they aren't completely disordered they'll find themselves a new place.

We have 59 units and (mostly untreated) mental illness and personality disorders have (likely) been the underlying causes behind the aberrant behaviors that have prompted every single non-renewal and eviction that we've had in the last 5 years (expect for the drug dealers- who we also non-renew but they are easier to work with).

She has suffered with PTSD, anxiety, and trauma induced bipolar since her mother’s murder suicide a couple years ago.

She has suffered with PTSD, anxiety, and trauma induced bipolar since her mother’s murder suicide a couple years ago.

It's set to a loud volume because he claims he has sleep apnea (sleeping disorder) and can show a doctor's letter to prove it. 

Disorder in front of most the units on the property when I snooped around last week.

@Bailey Kramer Learn about cluster "B" personality disorders.

I don't have experience as a landlord, but I have one as a housemate and one as a friend to someone with Section 8 assistance:In the last apt. that I rented briefly before we moved into our "forever home" the downstairs neighbor was a beautiful young woman with a tragic psychotic disorder.  

Well I was cleaning out his stuff and came to a drawer that was filled with about 500 bipolar pills that he had not taken.