SITE Centers began in 1965 as Developers Diversified Realty, founded by Bert Wolstein. The company is a self-administered and self-managed real estate investment trust focused on owning, leasing, redeveloping, and managing shopping centers. Its portfolio is composed of open-air properties located in the United States, and its business centers on active management of retail real estate. The company has also operated under the DDR Corp. name, reflecting a longer history in retail property ownership and management.