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KfW Westarkade in Frankfurt, Germany. (Spiegelneuronen / Flickr)
The Chicago-based Council on Tall Buildings and Urban Habitat (CTBUH) sought out a deep understanding of sustainability and contextualization in selecting the Best Tall Building of 2011. This year’s worldwide winner, while hardly as tall as last year’s winning Burj Khalifa, went to the KfW Westarkade tower in Frankfurt Germany. The 184-foot-tall tower is projected to use half as much energy as a typical European office building and only a third the energy of a standard U.S. building. The 10th-annual awards ceremony took place November 3 at a distinctly horizontal building in Chicago, Mies van der Rohe’s Crown Hall.