Duke Realty Corporation is one of the largest vertically integrated office and industrial real estate companies in the United States, operating as a real estate investment trust. Founded in 1972, the company specializes in the ownership, construction, development, leasing and management of office, industrial, medical office and retail real estate. Duke s properties encompass more than 110 million rentable square feet that are leased by over 3,500 tenants. It also provides real estate services, such as property and asset management to third party owners. The firm in a joint venture with Bremner Healthcare serves the real estate needs of health care providers. Duke Realty Corporation is headquartered in Indianapolis.