@Don Konipol we solved it by learning from the Intentional Living Community (the OG's of independent adults living together). 

Draining an entire pool in to a kitchen sink sounds like something my 8 year old would think of- an adult who owns their own contracting business? 

My thoughts are if looking to rent on a bedroom basis, it is most likely going to be to single adults, whom I would like opt to live as close to downtown St.

While working on the house last week, a woman and her adult son stopped by to ask if we would be renting soon.

Open to group home, adult day care, senior living etc.

Put up a light with motion sensors, but honestly if one of the adults is sneaking out the back in the middle of the night-that is silly-why not walk out door like a normal person. 

Also, make sure that you pick a contractor that is licensed, insured and an adult about running his business, meaning he shows up on time, works professionally and keeps the site clean, as well as communicates well with you. 

adults=1&am...

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

Living rent free (again not assuming that is your situation, but guessing many parents with adult children at home don't charge them rent), it can be easy to spend that money and then when you are on your own, having problems budgeting.