You have to generate jobs to get population growth beyond just having more a few more babies than people who die. 2) I tried to cover some of the business issues in my first post.

I guess I see my tenants as my kids.One of the properties I bought came with a 1 year home warranty, and on two occasions the tenants had to 9 days without hot water, and another time a week without a clothes dryer while repairs got approved.

Dave Ramsey goes through all of this in his 7 Baby Step program.

I found an as-is property that looks to be about 30% undervalued, but it has clothes, furniture and other belongings left behind as well as a kitchen (gross floor, no cabinet doors) and bathroom that needs major work.

If you stumble across someone still living there and they get angry, tell them you thought you heard an abandoned baby crying or something.If you're not comfortable, post a notice on the door that you suspect it's abandoned and will be back in 24 hours to inspect. 

@Ben Einspahr "Baby action steps" - This exactly. 

No significant food, medicines or clothing.

So they go to friends/family members' homes to wash clothes. 

We want to think realistically and take baby steps if possible.

This gives you a comparison to the level of mold spores that are naturally occurring and are "tracked into" the house on people's clothing, pets, etc.