Halakhah zu Wajikra 25:33

And from the content of the commandment is that which they, may their memory be blessed, also said (Bava Metzia 108a) that if one purchased a field of holding and planted trees on it and thereby enhanced [the field]; when it returns, we evaluate the enhancement that is in it for the buyer. As it is stated (Leviticus 25:33), "the sale of the house shall go out," - and the traditional received explanation comes about it [that] the house goes back, but the enhancement does not go back. And that which they, may their memory be blessed, also said (Arakhin 29b) that if one sells his field - whether it is a field of holding or another field - he is not permitted to redeem it in less than two years, even with the permission of the buyer. As Scripture commands that the sale stay intact for two years regardless, from that which it is written (Leviticus 25:15), "for the number of years of harvests shall he sell it to you" - that is the warning to the seller; the warning to the buyer is from that which it is written, "In the number of years shall you buy"; and the minimum of [what can be referred to as] "years" is two. It seems that the matter is so that no one will sell his land without difficulty, and he should not think that he will return and buy it from the hand of the buyer tomorrow. Rather he should know that he will not be able to eat from its produce in any way for two full years from the time of the sale. And they, may their memory be blessed, also said (Arakhin 29b) that the buyer must consume two harvests during those two years, as it is stated, "years of harvests." Therefore, if one of these two years is a year of blight or plant-disease, or a [sabbatical year], it does not count in the tally. [But they, may their memory be blessed, said that a fallow year is counted.] If he sold it in the Jubilee year itself, the sale is not a sale, and the money is returned to its owner. If he sold just the trees, they may [also] not be redeemed in less than two years. But if they are not redeemed during the Jubilee [cycle], they do not return in the Jubilee - as it is stated (Leviticus 27:25), "and return to his holding," but not to the trees. If he sold it to the first one and the first one [sold it] to the second one and the second one to the third one - and even if there were one hundred or more [buyers] - the field returns to the [original] owner at the Jubilee, as it is stated (Leviticus 27:24), "to he who has a holding of the land." And the rest of its details are at the end of Arakhin (see Mishneh Torah, Laws of Sabbatical Year and the Jubilee 10).

From the laws of the commandment is that which, they, may their memory be blessed, said (Makkot 12a) [that] beyond these three thousand ells that we said above that is of open space, fields and vineyards, we give to each city a cemetery, as it is stated (Numbers 35:3), "and their open spaces shall be for their beasts and their property and all their animals (chayatam)" - and the explanation came about this, that it was was given for the living (chayim), and not for burial. And that which they also said (Arakhin 33b) [about] priests or Levites that sold one of their fields or a house even in a walled city, [it can] always be redeemed, even from the hand of what is consecrated, as it is stated (Leviticus 25:33), "a perpetual redemption shall there be for the Levites." And [in the case of] an Israelite who inherits [property] from his mother's father who was a Levite, behold he may redeem like the Levites. And the rest of its details are elucidated at the end of Arakhin.