David Milberg, an attorney with the Schiff Hardin law firm located in the Willis Tower in Chicago, stands by a window at the firm's 66th floor offices. At Willis Tower, like other skyscrapers around ... more 
David Milberg, an attorney with the Schiff Hardin law firm located in the Willis Tower in Chicago, stands by a window at the firm's 66th floor offices. At Willis Tower, like other skyscrapers around the country, much has changed since two hijacked jets slammed into the twin towers of New York’s World Trade Center a decade ago. Many high rises are tougher to get into. At Willis Tower, for example, in the immediate aftermath of the attack, airport style security was installed, complete with metal detectors and security officers going through bags. (AP Photo/M. Spencer Green) less 
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Associated Press | Photo By M. Spencer Green
Tue, Aug 23, 2011 5:17 PM EDT