system
A chat on subreddit /r/PoliticalCompassMemes
human
Way easier said than done, ESPECIALLY after the landlord pissed them off. If they do it correctly, it will be a long drawn out process that will hurt the 60k offer
gpt
This entirely depends on the jurisdiction. Some states are super easy, some are super hard. 

Either way, I'd start eviction if they didn't want to leave.