Duke Realty is royalty in the realm of US commercial real estate. The self-managed and self-administered real estate investment trust (REIT) owns and develops office and industrial properties primarily in major cities in the Midwest and East. In addition to about 750 properties totaling more than 135 million sq. ft. of rentable space, the company owns some 4,800 acres of undeveloped land with options to acquire more. The REIT is also building its holdings of industrial and medical office properties, which account for about three-quarters of its portfolio. Duke's service operations include construction and development, asset and property management, and leasing. The company was founded in 1972.