The Orange County Property Appraiser is responsible for identifying, locating, and fairly valuing all property, both real and personal, within the county for tax purposes. The "Market" value of real property is based on the current real estate market. Finding the "market" value of your property means discovering the price most people would pay for your property in its current condition. Determining a fair and equitable value is the only role of this office in the taxing process.nWhat is important to remember is that the property appraiser does not create the value. People make the value by buying and selling real estate in the market place. The property appraiser has the legal responsibility to study those transactions and appraise your property accordingly.