Go to Small Claims, (you will automatically win)...then take the Judgement and get it recorded.

@Ethen Royal you can't report the eviction to the credit bureaus.Companies doing background screenings pull evictions from public court records.You will need to get a money judgment through the courts, which should automatically be added to their credit record via a similar process.

In Oregon (not just in Portland) you can't preemptively issue a no-cause eviction due to a property sale unless you have an accepted offer.If you are going to make an offer to the tenants to move out early or prior to your property going up for sale that offer can't be for less than what they would be eligible to automatically receive via Rental Relocation Assistance.

Less friction if I collect their bank info at the beginning and set up automatic charges. 

Automatic late fees3.

I'm not a lawyer, no legal advice, but my understanding just as a real estate agent is that if the wholesaler ratified a contract with someone else outside of your own contract parameters, that default should not be on you unless it's already written in your contract with them that you would automatically extend if they have a ratified contract that closes outside your expiration date (so would be in your contract parameters). 

It’s like the automatic debit method that some bill companies do.

When that time comes, the TV automatically logs off all accounts. 

Contact an investor asking for purchasing criteria and then immediately put the investor on a mailing list where they are inundated with automatic emails and recieve every new listing in the target neighborhooods, purchase price range etc.2.

While it’s not full proof, some potentially “bad guests” would weed themselves out automatically for not wanting to answer those basics.