Hello everyone! I am selling my Father's home in Arizona and it has both above and below grade living spaces. It was built as a split level home with the same finishes in both areas. It is served by the same AC/heat unit with installed duct work and has large (3'x6') windows in each room and a door leading to the outside from the basement level. The water table in Tucson is at 180 feet. We understand that the ANSI requirements regarding below/above grade in Arizona require the below grade space to be rated differently. There is 1220 feet upstairs and 1227 in the basement area, so we are not talking about a small space. My question is, is there a formula or standard that is applied to the appraisal of the below grade portion? Our below grade space is appraised at 17% of our above grade space and that seems ridiculously low. Can anyone shed some light on this for me? The sale of our home is in jeopardy over this issue and I am trying everything I can to make it work. Thanks for any input that would be helpful.