The "boiler plate" at the top of the Summary of Sales Comparison Approach which is followed by a line by line item explanation of the individual adjustments:
Adjustments made to the comparables are based on analysis of historic sales data of thousands of properties over an extensive time period. Through the use of paired sales when available within a particular sub market, the use of sensitivity analysis when appropriate, interviews with RE agents, potential buyers and sellers, RE investors and other market participants the appraiser has developed adjustments within local market sub markets (size, lot size, price range etc) that are reflective of typical market participants reaction to the various differences in amenities, condition, quality etc. Adjustments are not necessarily "derived or developed" for each individual appraisal report in a vacuum, but are derived and developed over a long period of time of analyzing similar properties in a particular market sub segment repetitively.