Gary P. Nussbaum

Society of Industrial & Office REALTORS (SIOR) is a commercial real estate association that represents the world's top producing brokers. The non-profit company is based in the United States and has subsidiaries worldwide. SIOR offers categories and an application process for membership, collaborating with industry leaders through its industry partner programs. SIOR membership signifies that you are among the most knowledgeable, experienced, and successful commercial real estate brokerage specialists. Robert Thornburgh has been the CEO of the American company since 2021.

NAIOP, Inc. operates as a commercial real estate development association for developers, owners, and investors of office, industrial, retail, and mixed-use real estate. It offers advocacy, educational programs, and business and networking opportunities. The company was founded in 1967 and is headquartered in Herndon, VA.

Cushman & Wakefield, Inc. provides commercial real estate services. Its services include agency leasing, asset services, capital markets, facility services, global occupier services, investment and asset management, project and development, tenant representation, and valuation and advisory. The company was founded by J. Clydesdale Cushman and Bernard Wakefield on October 31, 1917 and is headquartered in New York, NY.

Transwestern Commercial Services LLC provides real estate brokerage services. Its services include sustainability services, capital markets, research, management services, tenant advisory, and agency leasing. The firm also provides financial and advisory services to institutional investors. The company was founded by Robert D. Duncan in 1978 and is headquartered in Houston, TX.