LEGO Architecture 21000 Willis Tower

21000 Sears Tower was a 69 piece Architecture set released in 2008. In the United States the set was released in 2008 as 21000 Sears Tower. However, in the UK, the set was released as 21000 Willis Tower in 2011. The Sears Tower changed it's name to the Willis Tower in 2009 when Sears Roebuck and Company sold the tower the Willis Group Holdings.

It was retired in October 2011 with a lifespan of 35 months.