It’s been a while since I rented from a sole-proprietor, but we shouldn’t be allowing corporate ownership of single-family housing at all.
Yeah, landlords generally suck, but the guy with six units is a hell of a lot more responsive than whatever out-of-state corporate office that bans calling the leasing office for maintenance.
A friend of mine owns two rental properties, and he’s rarely available on weekends because he’s fixing a deck or replacing a water heater.
With the increasing concentration/divide of wealth, this is only going to get worse without regulation. It’s frustratingly easy to solve, yet places suffering from this problem seem to be hesitant to solve it in the simplest of ways possible - add a flat tax to anyone who owns more than one property or is not a resident.