Really?? Please tell me, out of the last 50 reports that you did, how many of them contained the data and analysis supporting your GLA adjustment?
This is not an AMC issue - it is an industry/appraiser issue.
That may very well be, if they are looking for some standard of great detail of how each and every adjustment ( including living area ) was arrived at. I frankly don't know what that universal standard is supposed to be. I know for my work I explain how I arrived at GLA sf contributory value and the way it functions after all other adjustments are made in narrowing the value range, the comps on the grid show it in action, it has a relation to cost approach as well.
But I don't run regression or statisticians to support it. So far none of my clients have asked for that . If they wanted that I'd have to feel confident I could use those programs well enough to understand what they are when used.
Imo this detailed support for adjustment is over rated at times, if other issues are weak in the report. For example, I was given the "other appraisal" in a refinance, done by a cert gen, we both had appraised at different times a very high end property. On and on they went with detailed support for an adjustments that was very militarism to mine for Sf. That appraisers exhibit of support for adjustment was superior to mine. BUT and this is a big one - they LIED, flat out lied about the subject and the comps being in the same subdivision ( they clearly were not, due to nature of this unique area the comps were in gated country club community and subject 1.5 miles away and subject was out side it )
so which report overall is more credible and reliable, one based on a lie with detailed "support" for a Sf adjustment or one based on the truth, with similar sf adjustment but a less detailed explain for the adjustment?
Of course the best would be an appraisal based on truth with detailed adjustment explanation...how many clients want to pay good fees, allow ample time, AND hire honest appraisers ? ...agree it is an industry problem