CENTURY 21 Diamond Realty is a real estate firm with a presence in Izoro and Topsey, Texas. The company deals in the buying and selling of commercial and residential properties. With a presence in Copperas Cove, Texas, it is a part of Century 21 Real Estate, which is the franchisor of one of the world s largest residential real estate sales organizations. The parent company provides training, management, administrative and marketing support. It comprises more than 8,300 independently owned and operated franchised broker offices in over 50 countries and territories worldwide. Century 21 Real Estate is a subsidiary of Realogy Corporation, which is a global provider of real estate and relocation services.