No. Here, during the gogo years of Covid, home prices were inflating by as much as 2% per month while site prices were mostly flat (except acreage tracts outside of towns). That is why, without land sales, the cost approach tends to be useless. Thirty years ago, most towns in eastern Montana had housing stock that was mostly 30 to 100 years old and many had not had a new home constructed in decades. I was regularly estimating external obsolescence in the 25% to 40% range...if you built a new home on land you owned, you could expect to lose up to half your investment by the time you moved in. Rates of depreciation are affected by the market and are not simply a product of age and/or pronouncements of entirely subjective "effective age."