house with more than 1 story / storied building / floor / CL:層|层[ceng2],座[zuo4],棟|栋[dong4]
楼
=
娄
+
木
:
In the outhouse's kitchen (ou2), Sir Lancelot (l) set up a Christmas tree (木) next to his lunar mansion (娄). Lancelot made himself a Christmas present by adding another floor on top of his lunar mansion. His lunar mansion now is a big, storied building (楼).