without digging too deep

Dig deep. In many jurisdictions, investigations are on a by-complaint basis.

If one person "lives" there, that means they have residence, which means they can't be made to leave unless they're evicted. I doubt a company is going to trust any ordinary employee to be in that position.

They may also be in violation of noise ordinances. Some jurisdictions also have ordinances against parking in the grass, which they may also be in violation of.