Equity Residential is a real estate investment trust. The Company is focused on the acquisition, development, and management of residential properties located in and around cities. The Company’s primary business is the acquisition, development, and management of multifamily residential properties, which includes the generation of rental and other related income through the leasing of apartment units to residents. The Company owns and operates rental apartment properties, with a presence in Boston, New York, Washington, D.C., Southern California (including Los Angeles, Orange County and San Diego), San Francisco and Seattle, and an expanding presence in Denver, Atlanta, Dallas/Ft. Worth and Austin. The Company owns investments in approximately 311 properties located in 10 states consisting of over 84,249 apartment units. ERP Operating Limited Partnership (ERPOP) conducts the multifamily residential property business of Equity Residential.