It was designed by German-American architect Helmut Jahn and won the 2002 Silver Emporis Skyscraper Award.

The building is located at the river Rhine and in the center of the old parliament area of Bonn near the Deutsche Welle and has about 55,000 m2 office surface.

Construction phase was May 2000 to December 2002, 80,000 m³ of concrete and 16,000 tons of structural steel were used in the building shell.

Via a decentralized underground convector, the external air is sucked in from the space between the façades, then it is conditioned and fed back into the offices.

The benefits gained by the Post Tower in using up to 130 liters of groundwater per second to heat and cool the concrete core.