If not, having an agreement with the tenant to voluntarily vacate by X date to avoid eviction, then recouping as much as possible from security deposits is often the cheapest and fastest solution.  

The police once checked my mom out to see if she had a pot grow going on because she came up on a list of excessive utility users between the pool for the water and her violet plants. 

Explain the situation and see if one of them is voluntarily willing to leave.

Other "damage" that we've had to use funds from this account to pay for were small things like a new coffee pot (when the lid was melted in the dishwasher), a new set of sheets that were damaged by a wet bathing suit bleeding red dye, and a new twin mattress when a special needs child accidentally wet the bed.As for security deposits on AirbnbI learned recently that if you use OwnerRez PMS software you can charge an Airbnb guest a security deposit.

You need really good margins to voluntarily take in that non payment risk (though it’s certainly manageable through thorough tenant screening).  

And some tenants just pay the extra amount "voluntarily" because they know what the contract  says.  

You can't force them to sign a new lease if they don't want to because you are buying the existing lease, but I have not had a problem with them voluntarily signing my lease.

You could also sweeten the pot by giving him a 50% match on the additional $300 a month so he would have $10,800 for the down payment at the end of the lease.  

The legalization of pot in other states will drive people away.

The fewer hands reaching into the pot, the better.Oren