Try to find out from your appraisal district why the change in 2021 from listing separate values as shown in 2020 to showing a house value of 0 in 2021. If you believe the separate values shown in 2020 are reasonable and that the land and house appreciated about equally from the time you bought the property. use the percentages of total value for the land and the house to proportion the original purchase price for the land and the house.
