King James Version
And if a man purchase of the Levites, then the house that was sold, and the city of his possession, shall go out in the year of jubile: for the houses of the cities of the Levites are their possession among the children of Israel.English Standard Version
And if one of the Levites exercises his right of redemption, then the house that was sold in a city they possess shall be released in the jubilee. For the houses in the cities of the Levites are their possession among the people of Israel.New International Version
So the property of the Levites is redeemable-that is, a house sold in any town they hold-and is to be returned in the Jubilee, because the houses in the towns of the Levites are their property among the Israelites.