CENTURY 21 Gold Star is a real estate firm that deals in the buying and selling of single-family homes, condominiums, townhomes and commercial properties. The company provides relocation support services and online mortgage calculators. 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 services. 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.