Dude, try doing a 50-year-old house on 27 acres with 5 outbuildings and an arena. You can do the lot size and GLA adjustments, but just try to support the adjustments for a 1800 sf workshop, 3000 sf barn, 1800 sf barn, 33000 sf arena. There isn't any regression model with enough data to tell you the adjustments on each and every outbuilding. For that matter, the lot size adjustment. And, in today's underwriting world they will ask for the support for those adjustments. They are going to make it impossible to do complex rural assignments no matter what the fee. They don't want to hear the "market reaction" they want to see support for that market reaction.