Most property owners understand that tenants can occasionally go through a rough patch with jobs, health, etc.  

Tell them you are afraid that there is mold in the unit and that the occupant is at health risk. 

@Daniel PitnerTo me, $4k/month isn’t enough once you factor in health insurance, etc. and retirement at 35 just seems odd to me unless you have tons of money to travel and do great things.

My business partner and I are both married to mental health counselors who we called on to help with handling our difficult tenants like yours.

What would be the collective effect on the health of the community as a whole.

@Michael Temple I use the same techniques as in my day job working in mental health. 1.

U will have the following answers  4k a month to 100k a month.. with the overwhelming majority settling on 10k a month that seems to be the magic number for many many investors If I can just get to 10k a month.Myself back in the late 70s I thought if I could just make 5k a month I would have more money than I knew what to do with.But then reality hits  kids  self employment tax  having to buy your own health insurance..  

Before I started studying real estate management I worked in the IT-business as an QA-engineer with developing the health care in countries in Africa (Uganda and Zambia mostly) and before that I studied electricity and energy for three years and worked as an electrician for about a year. 

just minute amounts for short exposure may not lead to health problems.I have contracted asbestoes pneumonia beofre sanding linoleum backing,,,unknowingly,,,before I had it tested. 

Did you have any health or family issues that you had to overcome?