There are more things that you can vow or dedicate to the Lord than people or animals. God now codifies the laws of redemption for houses and land. Just like with redeeming an unclean animal, if you want to redeem a house, you have to pay a fifth higher than market value for it. The priests could sell it and they should get their valuation, but if the person dedicating it buys it back, they are required to pay more. For land, the value is based on the amount of seed that would be typically sowed. Good open prepared fields would take much more seed to plant than where there was a mix of rocks and trees in addition to open land. The land was valued strictly on its ability to produce grain. This makes sense because God has given us dominion over the land, not so we can set it aside and have it be useless. Man has responsibility to make land useful and not subject it to futility. The land is valued based on its productivity until the next Year of Jubilee. If he does not chose to redeem the land, then at the Jubilee it becomes irredeemable. It permanently belongs to the priesthood. If you vow land that was land you bought, then it goes back in the Year of Jubilee, just like it would if you had not consecrated it.