You also have landlords that hold a large number of units (often times a corporate entity, with management outsourced), then you have individuals who are rentin

You also have landlords that hold a large number of units (often times a corporate entity, with management outsourced), then you have individuals who are renting out their old house after they moved (either because they can't sell for what they owe, or other reasons). And often times the people renting behave pretty bad (not intentionally, but there is often more than the "normal" wear and tear).