Sears Tower

In Chicago, the owners of the Willis Tower—formerly known as the Sears Tower—recently began seeking investors to buy all or a portion of the country's tallest skyscraper.

CME Group to Sell Chicago Building Jacob Bunge 2011

Formerly known as the Sears Tower, the 110-story building was acquired in 2004 for about $840 million by the ownership group, which also includes American Landmark Properties Ltd. of Skokie, Ill.

Willis Tower Goes on the Block Maura Webber Sadovi 2011

In Chicago, the owners of the Willis Tower—formerly known as the Sears Tower—recently began seeking investors to buy all or a portion of the country's tallest skyscraper.

CME Group to Sell Chicago Building Jacob Bunge 2011

In June the owners of the Willis Tower in Chicago said they were looking to recapitalize or sell North America's tallest building, formerly known as the Sears Tower.

Wrigley Eyes Sale of Signature Building Maura Webber Sadovi 2011

Formerly known as the Sears Tower, the 110-story building was acquired in 2004 for about $840 million by the ownership group, which also includes American Landmark Properties Ltd. of Skokie, Ill.

Willis Tower Goes on the Block Maura Webber Sadovi 2011

Formerly known as the Sears Tower, the tower is 83%-leased, according to CoStar, and secures $780 million in debt due in 2017, according to Trepp LLC, a real-estate research firm.

Time Out for a Willis Tower Sale Maura Webber Sadovi 2011

"People forget that the Sears Tower was a target -- a genuine target, and the mayor responded, and his people responded, brilliantly to the threats," Bush said.

WATCH: George W. Bush Praises Mayor Daley In Chicago Jen Sabella 2010

"People forget that the Sears Tower was a target -- a genuine target, and the mayor responded, and his people responded, brilliantly to the threats," Bush said.

George W. Bush In Chicago: Praises Mayor Daley's Leadership The Huffington Post News Team 2010

"People forget that the Sears Tower was a target -- a genuine target, and the mayor responded, and his people responded, brilliantly to the threats," Bush said.

George W. Bush In Chicago: Praises Mayor Daley's Leadership The Huffington Post News Team 2010

"People forget that the Sears Tower was a target -- a genuine target, and the mayor responded, and his people responded, brilliantly to the threats," Bush said.

WATCH: George W. Bush Praises Mayor Daley In Chicago Jen Sabella 2010