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The laws governing the tax appraisal process Washington State are based upon the same principles and procedures that are used throughout the appraisal profession. There are three basic approaches to the valuation of real property:

MARKET APPROACH involves comparison of a property with the characteristics of similar properties that have recently been sold.
COST APPROACH involves estimating the replacement cost of a structure, and adjusting that estimate to account for depreciation.
INCOME APPROACH is an analysis of a property's value based on its capacity to generate revenue for the owner. The appraiser may use all approaches that apply to a particular property.