Welcome to the Arizona Chapter of the Society of Industrial and Office Realtors (SIOR). Founded in 1970, the Arizona Chapter is the largest SIOR group in the Southwestern United States. SIOR is the leading professional commercial and industrial real estate association. With members in 630 cities in 34 countries, SIOR represents today’s most knowledgeable, experienced, and successful commercial real estate brokerage specialists. 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. The Arizona Chapter proudly has 52 active members that work within the Greater Arizona market.