The sales comparison approach — sometimes called the market approach — values a commercial property by analyzing recent arm's length sales of comparable properties and adjusting for differences in size, location, condition, market timing, and lease terms. It's the most direct way to estimate value because it relies on actual transactions in the same market, rather than projected income or replacement cost.
The approach works best when the property type is common, transactions are frequent, and the market is reasonably efficient — multifamily, single-tenant retail, suburban industrial. It works less well for unique trophy assets, specialty properties, or thin markets where there simply aren't enough comparable sales to draw conclusions. In those cases, appraisers fall back on the income approach or the cost approach as the primary indicator of value.
The challenge of sales comparison is finding genuinely comparable sales and making defensible adjustments. Two industrial buildings of identical size in the same submarket might still differ in clear height, dock loading ratio, age, fire protection, power supply, and dozens of other characteristics that affect value. Each adjustment is a judgment call, and appraisers must explain their reasoning in enough detail that a reviewer can verify the math and the logic.
Sales comparison is also the foundation of property tax appeals. Owners challenging an assessment typically present comparable sales data showing that similar properties sold for less than the assessed value. The success of an appeal often comes down to the quality of the comparable selection and the defensibility of the adjustments — not the appraiser's conclusion about the subject property in isolation.
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