Make sure you have an adequate amount of data. If you don't have an adequate amount of reliable comparable sales, you cannot perform the sales comparison approach.
If you feel that your comparable sales are a little shaky, you may need to investigate and process more sales. Maybe you will have to analyze four, five, or more sales. If you don't think the three primary sales provide adequate support for your value conclusion, seek refuge in a wider sampling of the market.
Explain in the report that you couldn't find sales of properties that were very similar to the subject in all aspects, because of its unusual style, size, age, lot size, or whatever. However, you were able to find one sale that was very similar in style, another that was the same size and another that was about the same age, etc., and you are confident that you have utilized the most similar sales that were available.
Do you have enough land sales to accurately estimate the site value?
