In no particular order, here are the next batch of changes SE should make to the housing system:
  1. Restrict Large houses to FC only.
  2. Restrict housing NPCs to FC only.
  3. Increase garden spaces on all houses to the large house capacity.
  4. Add five wards to all neighborhoods with every major patch (4.3, 4.4, 5.0) until the issue is resolved.
  5. Forcibly release houses are are in violation to the ownership terms defined in 4.2 and provide the owners at least a month of warning prior to the patch this goes live to make arrangements so the automated rules don't do it for them.
It's time to slay this problem and end the slum lords for good.

Otherwise we're going to keep seeing videos like https://www.youtube.com/watch?v=znbBHGzjSB0 appear because the housing system is fundamentally flawed.