Leviticus 25:31-33

31But houses in settlements that have no walls around them are to be classified as open fields. The right to redeem such houses stays in effect, and they are to be released at the Jubilee.

32“Concerning the Levitical cities, the Levites always have the right to redeem houses in the cities they possess.

33Whatever property one of the Levites can redeem  — a house sold in a city they possess — is to be released at the Jubilee, because the houses in the Levitical cities are their possession among the Israelites.