That's just the monetary value, the networking and knowledge is invaluable IMO

Just call pest control and have the moles removed and fill in the mole holes.

Minor Foundation work and minor water damage from a patched hole in the roof).

However, I got to thinking that if I allowed these tenants to do this, they would probably stay longer than just one year, allowing me to avoid unnecessary vacancy and more quickly dig myself out of the hole I have on this property.

I have been playing the game of blocking the holes with rocks, rebar, wire mesh, etc but the groundhog's patience is endless.... just digs a new hole right next to the blocked one. 

You'll have to cut the wall from both sides, probably, so you'll want to hammer drill a small hole all the way through at the beginning and end of each planned cut, and then snap a line between those holes.  

We got one quote for $1800 which seems really expensive to assemble and put up 7 cabinets, a backsplash, mount a microwave, and cover up a hole. 

It's possible leaves or dirt dabbers have partially blocked the hole.

My tenant didn't take out his clothes from the dryer so I took them out and set them on the furnished bed I provided him.I notice a cut and small hole going into the center of the mattress that was not there on the walkthrough.

And they may take the toilet up and run the snake right through the hole where the stinky stuff goes in the floor.