SIOR stands for Society of Industrial and Office Realtors. Like CCIM, this is a designation representing an advance course of study available to Realtors. SIOR is an invitation only society with strict educational and experience requirements. SIOR is a global network of more than 3,000 industry leaders that stay at the forefront of innovation in commercial real estate via dedicated experience, ongoing education, a consistent focus on emerging trends, and real life experiences shared between members. SIORs value the power that comes with building relationships and sharing ideas that are on the leading edge of the industry.