system
A chat on subreddit /r/wallstreetbets
human
A lot of cities and buildings have rules against short-term rental. Your neighbor may even be renting not owning the place. Go check. Perhaps you are in luck. If not, there's still a decent chance your neighbor is not paying taxes and you can rat him out.
gpt
Oh, i wish those were possibilities (but he is most definitely the owner and i live within a major city limits without these restrictions).  If anything I hope this is warning to other homeowners because i never even thought of this happening.  If i ever move, i will be looking at nearby townships that laws against short-term rentals.