[If] a ground floor and an upper story belonging to two [people] collapsed, [and] the owner of the upper story demanded of the owner of the ground floor that he rebuild, but he refuses —- the owner of the upper story may rebuild the ground floor, and live in it until he reimburses him. R’ Yehudah says: Even this one [who] lives in his neighbor’s property must pay him rent. Rather, the owner of the upper story rebuilds [both] the ground floor and the upper story, and puts a roof on the up-per story, and lives in the ground floor until he reimburses him.

Similarly, [if] an olive press, which was built in a rock with a garden above it, partially caved in, the owner of the garden may go down and sow [his seeds] below until [the other] makes a dome for his olive press.  [If] a wall or a tree fell into a public domain and damaged, he is exempt from paying. [If] they gave him time to cut down the tree or to demolish the wall, and they fell within the time, he is exempt; after the time, he is liable.