What a property is worth depends on the person looking at it. Typically, an owner will feel a property is worth more than anybody else's evaluation, whether that's an appraiser, bank, casual observer, or potential buyer.
If we ask the opinion of your local real estate market, there will be many prices offered by potential buyers. The highest price offered will reflect the maximum value your property is worth to another person. Many real estate brokers will offer you comparable market analysis (CMA) to show you what similar properties suggest yours may be worth, but ultimately, only with real bids from buyers will you truly know what the market values your property.