Professional Registration: Licensed Real Estate Salesman - 1974 Licensed Real Estate Broker - 1978 Professional SIOR - Society of Industrial and Office Realtors CCIM - Certified Commercial Investment Member. Mr. Hartung has been active in real estate in Tallahassee since 1974. He began his professional real estate career in 1974 as a real estate salesman. In 1979, he formed his own company, Hartung and Associates, which became a Coldwell Banker affiliate in 1981. During this period of time, he distinguished himself and his office by consistently being recognized as one of the leading real estate companies in the Tallahassee area.