Sears, Roebuck and Co.’s announcement that it would build the world’s tallest building in downtown Chicago ... to the Willis Tower in 2009) later, former Tribune photographer Charles Osgood ...

Left photo: Sears Tower became the tallest building in Chicago, surpassing the John Hancock Center, seen in the background, when construction continued in November 1972. (Charles Osgood/Chicago ...

But in 1974, the company moved to the Sears Tower and ... Homan Square area in Chicago, some buildings still remained empty and are considered historical landmarks. Local photographer Martin ...

Left photo from @LWilz/Twitter ... last Sunday caused a building-wide power outage at Chicago's iconic 1,450 ft.-tall Willis Tower (aka Sears Tower), which has since loomed ominously over the ...

Getty Images has this crazy photo of lightning hitting the Willis Tower (formerly known as the Sears Tower) during a storm in Chicago on Wednesday. Read next Jump to ...

Just like in this scene from the 80s masterpiece Ferris Bueller's Day Off (Warning: Strong language), The Willis Tower (formerly The Sears Tower ... view of downtown Chicago's Loop.

Just like in this scene from the 80s masterpiece Ferris Bueller's Day Off (Warning: Strong language), The Willis Tower (formerly The Sears Tower ... view of downtown Chicago's Loop.