Thematic Bible: When alienable, and when inalienable

If thy brother becomes poor, and sells some of his possession, then his kinsman who is next to him shall come, and shall redeem that which his brother has sold. And if a man has no one to redeem it, and he becomes rich and finds sufficient to redeem it, then let him reckon the years of the sale of it, and restore the excess to the man to whom he sold it, and he shall return to his possession. read more.
But if he is not able to get it back for himself, then that which he has sold shall remain in the hand of him who has bought it until the year of jubilee. And in the jubilee it shall go out, and he shall return to his possession. And if a man sells a dwelling-house in a walled city, then he may redeem it within a whole year after it is sold. For a full year he shall have the right of redemption. 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 who bought it, throughout his generations. It shall not go out in the jubilee. But the houses of the villages which have no wall round about them shall be reckoned with the fields of the country. They may be redeemed, and they shall go out in the jubilee. Nevertheless the cities of the Levites, the houses of the cities of their possession, the Levites may redeem at any time. And if a man purchases from the Levites, then the house that was sold, and 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 sons of Israel. But the field of the suburbs of their cities may not be sold, for it is their perpetual possession.