from my post above # 12 -"A cap for the threshold of where buyers stop paying for size is supposed to come from the market."
I did not limit the market to simply looking at what closed within the last year or two..
That said, it is up to appraiser from research, talking to agents etc to decide how expanded a market is relevant to what a buyer for subject would consider. How far away do we look, if a buyer for subject is never going to consider such a far off location? How far back do we look- 3 years, 4 years, 5 years?. An appraiser is supposed to know the et area and from driving around can see what is being built/what exists. I certainly expand my search including competing communities, in these cases, often going back 3-4 years or X miles for competing/similar location/community. The point of an over improvement is when the research determined that virtually no, demand exists in the relevant area exist for such a large house, and what people buy/ build and eventually sell will reveal that. Like it or not, a mortgage lending appraisal is based on the SCA on a 1004 form. If someone is doing different work and client accepts a cost approach for a 20,000 sf house, go for it. ..
Webbed seems to imply that an over improvement does not exist. At least that is what I get from his posts. Otherwise I don't know what point he is trying to make