Century 21 Blackwell & Co. Realty is real estate firm with a presence in Spartanburg, S.C. The company deals in the buying and selling of commercial and residential properties. It provides a range of mortgage lending assistance and relocation support services. Century 21 Blackwell & Co. Realty 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.