The Feast of Jubilee: Sale of Property Calculated From
Source: TTT
Leviticus 25:15, 16
You are to buy from your neighbor according to the number of years since the last Jubilee; he is to sell to you according to the number of harvest years remaining. / You shall increase the price in proportion to a greater number of years, or decrease it in proportion to a lesser number of years; for he is selling you a given number of harvests.