In the first three months, I had almost $10,000 in expenses due to a collapsed sewer line and damaged roof.

I use Schlage be365 deadbolts because they require physically turning them to throw the cylinder.

You may charge for damages caused by the animal, but since it is not a 'pet', a pet addendum doesn't apply.

And I’m talking $100k+ in damages

I know legally I can evict, take him to small claims for past rent, late fees, and damages to the property.

If it’s an upper level I’d do it now before I leaks in to a lower unit and does damage. 

You should be well in your rights to hold the tenant responsible for rent, damages, utilities, and penalties until you get a new renter in there.  

It can also get you kicked out and liable for any damages the airbnb people cause, not to mention I imagine it is against Airbnb TOS.

The main issue I see in the history of the house is a massive water damage in 2015 which ended up around 40k in costs.

See below for information directly from seller:"2 BR / 1 BAOn a Lease/Purchase Contract for $45,000Tenants paid a down payment of $1350, Leaving a balance of $43,650Contract is at 180 months at 10.6% on $43,650 = $485.22/moThe Buyers are paying $112/week and usually pay every two weeks at $224, deposited into my bank account.As of now, the balance of the contract is $35,300.If, the Buyers pay the remaining 117 months, the total remaining is $56,770.74The Buyers love the location and the house for it is next door to the wife's parents and want to stay and finish the purchase.There is however some damage to the house of $7800, Quoted by ******.