DDR Corp. is a self-administered and self-managed real estate investment trust. It operates through two segments: shopping centers and loan investments. It is in the business of acquiring, owning, developing, redeveloping, expanding, leasing and managing shopping centers. As of December 31, 2016, it owned and managed approximately 106 million total square feet of gross leasable area (GLA). As of December 31, 2016, the portfolio properties included 319 shopping centers (including 152 centers owned through joint ventures). As of December 31, 2016, the portfolio properties also included over 650 acres of undeveloped land, including parcels located adjacent to certain of the shopping centers. As of December 31, 2016, the portfolio properties aggregated to 75.8 million square feet of Company-owned GLA located in 35 states, plus Puerto Rico. These centers are in the Southeast and Midwest, with significant concentrations in Florida, Georgia, Ohio and North Carolina, as well as Puerto Rico.