I think you all provide great points. But here is the reality of our jobs... you can spend days on an appraisal trying to dig up every fact. We are under time constraints and getting paid less. I believe in giving quality, but really how much time can you invest on an appraisal your getting paid $175 to complete in California from an AMC? Please don't bother replying with reasons why we need to keep our fees high. The truth is that appraisers are starving and the next guy will phase you out if you don't compete on fee. I use a data service, such as
www.dqnews.com, that lists decline rates by zip code over a 1 year period. It's not perfect, but it's something you can point to and pass liability. I go one step further than a monthly decline. I take the decline rate over 12 months and divide it by 365 to get a "per day" decline. Then I multiply this rate by the number of days from contract to effective date. Then I multiply that number by the sales price. It usually works decently. I'm guessing that some of the guys who are suggesting a complex analysis of the market are not "backing" into the cost approach either.