Comment by Nemi

Another thing that I read about on this topic was that once a land lord has gotten into a groove of extend and pretend they lower their costs and cut out the overhead of property management. This means that if they took on one tenant they would have to ramp up property management costs (and potentially refurb/improvement costs) and they are not willing to do that, so you end up with the situation where you can't rent a property even if you want to.