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Thursday, 6th November 2014 Chicago, USA. Helmut Jahn, CEO, JAHN, speaks at the 13th Annual Best Tall Building Symposium – Session 2 in a presentation entitled " Of Split Volumes and Double Skins: The Post Tower, Bonn,” where he provides an overview of the historic project, which was the winner of the CTBUH 2014 Tall Building 10 Year Award.