Levítico 25:30

30 If it is not redeemed before a full year has passed, the house in the walled city shall belong permanently to the buyer and the buyer's descendants. It is not to be returned in the Jubilee.

30 And if it be not redeemed within the space of a full year, then the house that is in the walled city shall be made sure in perpetuity to him that bought it, throughout his generations: it shall not go out in the jubilee.