PPSF reduction of 2 story to 1 story appears to be about 20%...

[Corbett Brasington]

I have a home I am considering where there are a lot of recently sold 1 stories but no 2 stories sold in the last 6 months. So I needed a way to estimate ARV given that I don't have any exact comps. So I pulled all sales of 4bed / 2 bath homes in that zip code for the last 2 years and found that the PPSF reduction from a one story home to a two story home around 20%. I did this for each year (median, and mean) and then I also did it for the entire data set using upper quartiles, and lower quartiles too. It was consistently a reduction of 20% +/- 3%

I am curious if this has been true for anyone else in their markets and if not what is it for you?