There are no properties that we are aware of that exist in a universe by themselves. Many appraisers believe there is no relationship between the prices and values of homes that are not nearly identical, or "comparable" (without a definition) to one another and create artificial measures like style to assert a conclusion they have never tested. How could a 1950s ranch and a 1950s split-level of the same size and quality, similarly maintained and updated, and located beside one another, not be comparable to and competitive with one another? It is rather easy to test, and I do so routinely, and never find a defensible difference. Yet, every day, I see appraisers claiming they are not comparable, although I have never had anyone explain how they arrived at that conclusion. There could be a difference in value, but if that can be determined, then the difference can be adjusted for. But if you don't do the work, you are just assuming they are not comparable. That way, you don't have to explain to anyone that different styles don't matter and don't impact value, and don't have to actually know whether or not they are comparable and competitive with one another. The fact is that within a given geographic area, the prices and values of all properties are related to the prices and values of other properties in the same area. It is our job to measure how, and how that impacts values.