Leviticus 25:30-33

30But if it be not redeemed until a whole year is complete, then the house that is in the walled city shall be established for ever to him that bought it, throughout his generations: it shall not go out in the jubilee.

31But the houses in villages that have no wall round about them shall be reckoned as the fields of the country: they may be redeemed, and they shall go out in the jubilee.

32But as to the cities of the Levites, the houses in the cities of their possession, the Levites shall have a perpetual right of redemption.

33And if any one redeem from one of the Levites, then the house that was sold, in the city of his possession, shall go out in the jubilee; for the houses of the cities of the Levites are their possession among the children of Israel.