We compel him to build a gatehouse and a door for the courtyard. Rabban Shimon ben Gamliel says: Not all courtyards require a gatehouse.  [We] compel him to build for the town a wall, double doors, and a crossbar. Rabban Shimon ben Gamliel says: Not all towns require a wall. How long must one be in the town to be [treated] like [one of] the citizens of the town? Twelve months. [However, if] he bought a house there, he is immediately [treated] like [one of] the citizens of the town.