@Michael ReilmanKohler and American Standard both make great toilets, but Kohler toilets have unique parts that you can't replace at Home Depot or Lowe's.

Once they are in the property, you run the risk of them squatting the place.

Do you think he is going to hold over or squat?

I’m GUESSING it’s a toilet or underground leak, call it 90%. 

I need to install LVP throughout, replace bathroom vanity, toilet, and fixtures, install a new dishwasher, and finish a 300 sqft ADU with drywall, paint, and LVP that can be used as an office, rec room, etc. 

They are almost certainly responsible for issues caused by abnormal use or abuse, such as a kid sinking his battleship into the toilet.

A few days ago, one of the units experienced a toilet backup.

Today, for example, I had to leave work to run a toilet to my plumber because when he took off the old one, someone had done a hack job on the remodel plumbing and damaged the flange and we actually needed a smaller toilet than was on it (10" instead of a 12").

The first thing the technician did was take a toilet tank cover off and run his hand across the bottom.

The last event was a vape stuck in the s-trap of the toilet that required toilet to be replaced.