Leviticus 25:29

And if a man sell a dwelling-house, in a town surrounded by a wall, it may have redemption until the completing of the year from its sale: from time to time shall be its redemption.

a walled city surrounded by a wall.

one year [literally: days] The word denotes a year — until the days go through the cycle from cold to warm, summer and winter, returning to the way they were originally (with the sun in approximately the same location). We require the tradition [⊂ Arakhin 31a] to define a complete year — whether it is a solar year, or a lunar year, or a lunar leap year.

AND IF A MAN SELL A DWELLING-HOUSE IN A WALLED CITY. Since a man finds it very difficult to sell his house, and be disconcerted at the time of the sale, therefore the Torah wanted that he [have the right to] redeem it within the first year [after the sale]. And because man is servant to the field, and the bread of his sustenance comes from it, the Torah wanted [that if the seller did not redeem it before the Jubilee], it should go back [to him] in the Jubilee. But with regard to a house [in a walled city], after [the seller] has given up hope [of regaining it], by changing his residence and staying for a year in another house, it can no longer cause him harm [if he cannot redeem it after a year], since his [source of] livelihood will not be diminished if it will be forfeited [to the purchaser]. And the houses of the villages [which have no wall round about them] are made for the purpose of protecting the fields, and to serve as dwelling-places for those who cultivate the earth; therefore their law [of redemption] is similar to that of the fields of the country [i.e., they may be redeemed at any time until the Jubilee, and in the Jubilee they go back without compensation].

ואיש כי ימכור בית מושב עיר חומה, “and if a man had to sell a house (his) in a walled city, etc.” the “man” described here as a “man,” is none other than the Lord. He had been described as such in Exodus 15,3: ה' איש מלחמה, “The Lord is a man of war.” The expression is a euphemism for “Master, overlord.” We find the expression also used in Ruth 1,3, where the husband of Naomi, Elimelech, is described as איש נעמי, as opposed to בעל נעמי, to show the reader that if Naomi agreed to leave the land of Israel it was because her husband was her overlord, and she had no other choice. In our verse the expression בית-מושב, the house of his residence, is the same as if the Torah had written: מושב ביתו, his residence, i.e. his house. He sold it to gentiles. The addition of the word מושב is to alert the reader to Psalms 132,13: כי בחר ה' בציון אוה למושב לו, “for the Lord has chosen Zion; He has desired it as His residence.” [His people being exiled, is equivalent to His being exiled from Earth. Ed.] The previous owner of such a house has only one year during which he can redeem it and it becomes the permanent property of the person who had bought it. [Houses are not considered ancestral properties, which revert back to the original owner or his heirs in the Jubilee year. Ed.] G–d had promised to redeem His land after 70 years, (compare Jeremiah 29,10, [at which time the Babylonian Empire was replaced by the Persian Empire. Ed.]