Century 21 Fine Homes and Estates is a full-service real estate firm with a presence in Greenport, N.Y. The company deals in the sales and purchases of residential properties, farms, commercial buildings and vineyards. 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.