The Society of Industrial and Office Realtors (SIOR) is an international professional commercial and industrial real estate association based in Washington, D.C. It offers a professional designation (SIOR) to commercial brokers and other industry professionals. Its membership is composed of around 3,000 individuals and organizations in more than 630 cities in 32 countries. SIOR designees can hold the following specialty designations: industrial, office, sales manager, executive manager, or advisory service. SIOR also includes associate members, who are corporate executives, developers, educators, and other involved in the commercial real estate industry. NAREB. National Association of Real Estate Brokers is NOT the predecessor of NAR. NAREB still exists and is the minority RE brokers trade association founded in 1947 when minorities were NOT allowed. Also, minorities were NOT allowed to join NAR for MANY years. See www.NAREB.com