Leviticus 25:29

"And if a man sell a dwelling-house in a walled city, then he may redeem it in a whole year after it is sold; for a full year shall he 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 that 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, may the Levites redeem at any time. And if one of the Levites redeem, 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 children of Israel. But the field of the suburbs of their cities may not be sold; for it is their perpetual possession."

Two exceptions are explained here. A different rule applied to dwellings in walled cities; and special rules applied to houses of the Levites. There is possibly an ambiguity in Leviticus 25:33. The marginal reading inserts the negative, making the verse refer to a Levite's house not redeemed. If this is not what is written, then the passage might refer to the case of a Levite who for himself redeemed a property from another Levite, but, in any case, it reverted to the original possessor in the Jubilee.