>> I'm more concerned about mortgage payments or other landlords...he doesn't own everything as a fiefdom or something. <<

Well, not yet. ;)

>> It's also possible that higher rent will keep people jammed in living together instead of moving out (if they want to). <<

That's a big problem in L-America. In T-America, minimum wage is higher, housing is more affordable, people have better interpersonal skills, and more housing is designed for communal living. So it's less of an issue there, but still something to keep an eye out for.