if you use comparable properties which are located within the same or neighborhoods with similar appeal as the subject property, then would be no need for any adjustment. Tread very carefully here, lest you be accused of redlining or worse. As far as citing police crime statistics, what good does that do? If you are making a location based adjustment for a comparable property from a different neighborhood, you extract the amount of the adjustment from difference in sales prices between that neighborhood and the subject's neighborhood, not from the differences (if any) in real or perceived crime rates. Remember, you are an appraiser, not a sociologist. Just report the facts as far as market values are concerned. If similar properties in comparable neighborhood 1 have a median sales price which is 10% more than similar properties in the subject neighborhood, just make a 10% adjustment and explain that property values are 10% higher in the competing neighborhood and how you made this determination. There is absolutely no need to get into differing crime rates, etc.
