Lock doors for totally separate living--perfect for renting out one side and living in the other. 6-4-1-A (left) is a little outdated; it hasn't had any serious renovation work since the 70's. 6-4-1-B (right) is a lot more modern and spacious! Both have lots of outdoor/terrace space. I built this #duplex for siblings from my main game--my student lives on one side; my musician lon the other. Uses #basegame and two packs! #nocc #playtested and #functional but use "bb.moveobjects on" first. Enjoy!