Partners who agreed to the partition of a courtyard build the wall in the middle. Wherever they are accustomed to build [with] untrimmed stones, [or] hewn stones, [or] half-bricks, [or] bricks, they build; all in accordance with the custom of the province. For untrimmed stones, each one provides three handbreadths; for hewn stones, each one provides two and a half hand-breadths; for half-bricks, each one provides two handbreadths; for bricks, each one provides one and a half handbreadths. Therefore, if the wall fell, the place and the stones belong to both of them.

Similarly, a garden [is treated generally as] a place where they were accustomed to fence off, [and] we obligate him [to do so]. However, a valley [is treated generally as] a place where they were accustomed not to fence off, [and] we do not obligated him [to do so]. Rather, if he desires, he should withdraw into his own [field], build [a fence], and make a mark on the outside. Therefore, if the wall fell, the space and the stones belong to him. If they made [it] by common consent, they build the wall in the middle and make marks on both sides. Therefore, if the wall fell, the place and the stones belong to both of them.

[If] someone surrounds his neighbor on three sides, and he fences off the first, second, and third [sides], we do not obligate him. R' Yose says: If he stood up and fenced off the fourth [side], we devolve [the obligation for] all of it upon him. 4. [If] the wall of a courtyard fell, we obligate him to rebuild it to [a height of] four cubits. [Each is] presumed to have contrib-uted until [the other] brings proof that he did not contribute. From four cubits and upward, we do not obligate him. [If] he build another wall near it, even though he did not [yet] place a roof upon it, we [nevertheless] devolve [the obligation for] all of it upon him. [He is] presumed not to have contributed until he brings proof that he did contribute.

[If] the wall of a courtyard fell, we obligate him to rebuild it to [a height of] four cubits. [Each is] presumed to have contributed until [the other] brings proof that he did not contribute. From four cubits and upward, we do not obligate him. [If] he build another wall near it, even though he did not [yet] place a roof upon it, we [nevertheless] devolve [the obligation for] all of it upon him. [He is] presumed not to have contributed until he brings proof that he did contribute.