The former iconic Sears Tower and newly named Willis Tower is seen Friday, June 3, 2011 in Chicago. The owners of the Willis Tower are looking for investors _ or a buyer _ for North America's tallest ... more 
The former iconic Sears Tower and newly named Willis Tower is seen Friday, June 3, 2011 in Chicago. The owners of the Willis Tower are looking for investors _ or a buyer _ for North America's tallest building. The current owners paid $840 million for the 1,450-foot tower in 2004. They haven't said how much they'd ask for today. less 
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Associated Press | Photo By Robert Ray
Fri, Jun 3, 2011 10:04 PM EDT