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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Being able to make any lot a rental lot would also allow players to switch back and forth between playing in a house and playing in an apartment without having to move each time. So players would get more out of their packs than the would just playing either or for extended periods.
