Post Tower is a modern building in Bonn which houses the headquarters of the logistic company Deutsche Post DHL. Standing tall at a 162.5-metre, this 41-storey office building was designed by German-American architect Helmut Jahn and won the 2002 Silver Emporis Skyscraper Award. It takes pride in being the ninth tallest skyscraper in Germany, and the tallest in Germany outside of Frankfurt am Main.
Standing at the river Rhine and in the center of the old parliament area of Bonn near the Deutsche Welle, the building owns about 55,000 m² office surface. The building has the ground floor, 40 upper floors and 5 underground levels. The Tower with a surface area of 7,000 m², is constructed as a steel-glass-building. The base of the Post Tower has the shape of two staggered semi-ellipses of two shifted circle segments.
The building uses various climate control techniques. It has a double skin glass façade with about 1.2 m cavity between external skin and the primary façade and provides natural ventilation regulated by venetian blinds. The north-facing windows at the front are smooth, the glass windows on the south-facing façade are gently sloping to allow a better flow of air The building also has a decentralized underground convector through which the external air is sucked in from the space between the façades, conditioned and fed back into the offices and also the internal areas of the building through doors and corridors.
The office air is filtered into the Sky Gardens, warms up those areas and then is filtered back outside via façade flaps on the east and west sides of the Sky Gardens.




