The Mills Corporation was a publicly traded real estate investment trust headquartered in Chevy Chase, Maryland, United States, acquired on April 3, 2007, by an investment group composed of Simon Property Group and Farallon Capital Management.

The company started in 1967 as the Western Development Corporation, and its first mall was Potomac Mills in the Washington, D.C. metropolitan area in 1985.

In 1994 the company converted to Real Estate Investment Trust (REIT) status and changed its name to "The Mills Corporation".

After their last built mall was opened, Galleria at Pittsburgh Mills in July 2005, the company was investigated by the Securities & Exchange Commission for its financial problems.

Brookfield had the option to submit a counter offer, but on February 16, 2007, Simon Property Group and Farallon Capital agreed to acquire Mills for $25.25 per common share.