Any realtor can pull up comps for your area. I would be happy to do so. Jeffrey's answer below is very good but there is an alternative to going to court with the appraisal district: binding arbitration. There is a form online that allows you to request arbitration through the State Comptroller's Office. You need comps, pictures, investor/owner information in your area, and $500 to register for arbitration. If you win, you get your value changed to what the arbitrator determines to be the market value based on the evidence produced by each side. Good luck!
Keller Williams Realty