If he's so low that he's stealing signs, he could be dangerous.

In other words, it's very small, but I don't think it's in danger of disappearing.

Fast forward a year and a half later, and now I seem to have hit a "quarter life crisis" where I'm having difficulty accepting office jobs that appear to have no life and no substance to them.

He is a danger to your entire building and should be removed from the property in accordance with local laws.

If you were me, would you be afraid of putting your family in danger?

I also realized they are gone, have no money, have no character, usually have a substance problem and are not worth a lot of anger or fretting.  

Please advise me on the dangers of this.

In DFW there are a number of larger wholesalers who can be helpful if you really know how to rehab and know your numbers cold - can be dangerous if you don't. 

It's very dangerous, but they do it anyway.Maybe you should hire a professional inspector to look at this place.Good Luck!  

For example: if you owned a dry cleaning business and a rental property under one LLC, a suit against either would put both in danger.