However, it is important to note that the IRS has strict rules and regulations in place to prevent abuse of the depreciation tax benefits.

It’s probably legal to prevent them from having a guest in a common area.

The reason for this is to prevent people from getting a good deal, immediately refinancing, pulling all of their cash out, and having no "skin in the game".

However the property I ended up with has an odd black/brown countertop pattern with an 80s style oak cabinet stain, along with brown floors and a beige backsplash, so it's brown on brown on brown.

If they are trying to put a lis pendens in place to prevent you from being able to sell to anyone else, a quick letter from your lawyer will usually clean that up. 

I feel the topic of preventative exterior maintenance is rarely talked about.

If you file a complaint, they may suspend his license preventing him from working for any other companies or being able to pull permits anywhere. 3.

This helps prevent any fair housing issues and most cities do have laws around the number of unrelated people allowed to live together... and, typically, this number is shockingly low. 

You probably aren’t going to do enough to prevent a lawyer from piercing the corporate veil and making you liable anyway. 

Would you share some thought on the prevention measure on some of the items you mentioned?