With more than 3,000 members in 580 cities in 26 countries, SIOR represents today's most knowledgeable, experienced, and successful commercial real estate brokerage specialists. Extrapolated data shows that in 2008 the average SIOR member estimated that he or she leased or sold an average of 1.4 million square feet of space for a total dollar volume of $25.6 million in 32 transactions. As a group, SIOR designees sold or leased more than 3.3 billion square feet of space in 83,500 transactions. SIOR has certified more than 2,700 of its members with the prestigious SIOR designation, a professional symbol of the highest level of knowledge, production, and ethics in the real estate industry. Real estate professionals who have earned the SIOR designation are recognized by corporate real estate executives, commercial real estate brokers, agents, lenders, and other real estate professionals as the most capable and experienced brokerage practitioners in any market. SIOR designees can hold the following specialty designations: industrial, office, sales manager, executive manager, or advisory service. SIOR also includes associate members who include corporate executives, developers, educators, and other involved in the commercial real estate industry. The professional designation stands unchallenged for excellence in performance and is universally recognized as the prerequisite in the selection of a commercial real estate service provider.