| Simon Property Group, Inc. (Simon Property) is a self-administered and self-managed real estate investment trust (REIT) company. The Company owns, develops and manages retail real estate properties, which consist primarily of regional malls, Premium Outlet centers, The Mills and community/lifestyle centers. As of December 31, 2009, the Company owned or held an interest in 321 income-producing properties in the United States, which consisted of 162 regional malls, 41 Premium Outlet centers, 67 community/lifestyle centers, 36 properties acquired in the 2007 acquisition of The Mills Corporation, or the Mills acquisition, and 15 other shopping centers or outlet centers in 41 states and Puerto Rico. On February 4, 2010, the Company and its partner entered into an agreement to sell all of the interests in Simon Ivanhoe S.Ã .r.l (Simon Ivanhoe), which owns seven shopping centers located in France and Poland. |