Real estate valuation for single family homes is typically done by using comparable sales. With income properties this just doesn’t work well. Imagine if you are looking at a 24-unit building. It would be difficult to find similar ones nearby that have recently sold.

It’s also not ideal to use replacement costs for income property appraisal. How do you figure replacement cost if there is no land for sale nearby with proper zoning? This is used as a secondary method, though, and can tell you if maybe you should be building instead of buying.

Real Estate Valuation By Cap Rate

Income properties are bought for the income. Income, then, is what is used to determine value. The rate of return investors in a given area expect gives you the capitalization rate, or “cap rate” for the area. This is what you use to accurately appraise an income property. Below is a somewhat simplified explanation.
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