use your disadvantages against CMA's good points. For example, the CMA has a covered patio, and you don't; CMA has updated bathrooms and you don't. ...
http://www.lifestylesunlimited.com/how_to_protest_your_property_taxes_and_win/
read ad this article, it is well said. Dallas news has a few good articles as well. You should protest every year if you live in TX. Our went up $3000 this year alone. So go figure.