Here's the thing: If you are appraising a car wash for a bank for the purpose of a loan, refinance or whatever, you have to seriously consider valuing ONLY the real estate. You can use sales of operating similar car washes (self-service, express, etc.) to give you a value that includes the "going concern" value. I have seen car wash properties that were non-operational sell for anywhere from 30% to 70% less than a similar car wash that was operating when sold. So the cost approach is, in my opinion, the most reliable indicator of real estate value. It's pretty easy to find the cost for the car wash equipment and a good inspection will give you a good idea of the amount of physical depreciation (Building and Equipment). And if your sales comps are all of operating car washes, you have a value that is inclusive of going concern. As for the income approach, first it's rather difficult to get reliable information from owners of other car washes as to how much income the facility produces. So, it's hard to apply a GIM that is proven from your group of comparable sales. If you try to include the business income and put too much weight on that approach, you could end up overvaluing it. Should the car wash close one year after the loan, approved based on the appraisal, perhaps due to a newer car wash facility coming on line nearby, or bad management decisions, the bank will end up with the real property, not the operating business. And as I said earlier, closed car washes never sale anywhere close to one that is operating. It's up to the bank to decide if the "business" is viable, and it's up to the appraiser to offer a value opinion for the real estate only. That's why I typically put almost all weight into the cost approach and sales comparison approach and little into the income approach. A car wash is a special use property, and there is little that can be done to the improvements other than use as a car wash. Unlike a retail or office building that has gone dark, and would most likely sell just below or at market value, a car wash property that is closed would sell well below market value compared to an operating car wash.