Keystone ApPraisal company wasorporated October 19, 1908; the company has been a leading real estate for more than a century. The company holds a heritage of Providing client focused apPraisal and consulting services. Some of our serviceslude: environmental contamination like stigma damage, financing, condemnation, acquisition/deposition estate planning among others. They apPraise, office building, industrial land, and among others.