It looks like someone drew a whole lot of non-existing houses in this area:
Should anything be done about it besides deleting the houses?

Agree, they look too small to be real.
Please contact this user asking to not do such things in the future.
Also, I’d suggest to review his other commits.

Amazing how bored some people are.
Please don’t contact him (let’s assume it’s not a her). The best way to kill a troll is to ignore it - there’s no way he doesn’t know he’s causing damage and complaining would only encourage him, if not under this username, under another.
Delete the houses and keep an eye on the user to see no other damage is done.