The ability to make any lot a rental lot.
If we could make any lot as a rental lot then we could use any world as a vacation spot. You build your house in the world you like best and then go spend a week or two in another world.
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I like this. They could have the vacation worlds have all rental lots by default and the regular worlds all residental lots by default (apart from public lots of course) and the player has the option to change the lot types individually as they wish.
