The 21st century real estate (century 21) is a globally known real estate brand created in 1971 in california, united states, by united states real estate agents william butler and joseph fisher. Based on the concession model, the brand provides real estate intermediation services globally. The business model for real estate in the twenty-first century is based on franchising, aiming at creating a real and visible brand image and building brand value in the eyes of consumers by absorbing customers, retaining customers and continuing growth. The brand's concession strategy is aimed at creating collaborative networks and group power, leading to greater market shares. The system of real estate in the twenty-first century has more than 7,700 licensed union stores in 72 countries and territories worldwide, as well as 121,000 brokers in gold* uniforms. Together, these union stores and brokers constitute one of the world's leading integrated real estate service providers, providing professional integrated real estate services to consumers, including branding and licensing, second-hand house trading and leasing, real estate financial services, commercial real estate and new building agency and sales, and overseas construction. Since its entry into china in 2000, real property 21 has established 25 regional branches in mainland china, covering 37 major cities throughout the country. The brand, which has more than 1341 shops in china, dominated by union stores, and more than 16,453 brokers, provides consumers with one-stop shopping services。