More on the upstairs/downstairs neighbors, who share maintenance and the like. Including issues of when a tenant would move in with the landlord (or in place of him). What terms can be presumed to remain in place when issues crop up? Plus, a new mishnah about such a building collapsing and what happens when only the upper owner wants to rebuild. And Rabbi Yehudah's 3 examples of not taking advantage of another party's monetary goods.