They all have the same important characteristic in common.  

But using them for a workshop is very common.  

I also have no other complaints of slamming the common door aside from this tenant A complaining about tenant B. 

If those are the annual figures, wish the current owner the best of luck, but no one can profitably help.But it seems more likely from the language that @Keith Agnello used in the first post (and some common financial sense) that those are the current balance figures (meaning the owner is delinquent), and that represents something more than the annual figures plus some late fees, interest, etc.

Any common telltale signs to look out for?

This was a common problem in Charlotte. 

Hey guys I know Im not going to get every poor soul I talk to ready to jump on a lease option ,,I just want to respond in the most logical intelligent manner when I get these 2 common objections,,,,Any help appreciatedDave DoyleLos Angeles

That's a common scam.  

Personal guarantee is common.

I would never pay trash and utilities in a SFH unless it was very common in the area.