Wikipedia: "KölnTriangle (formerly also known as LVR-Turm) is a 103.2 metres (339 ft) tall building in Deutz, Cologne, and a prominent landmark in Cologne. The building was designed by Dörte Gatermann of Cologne-based architecture firm Gatermann + Schossig and completed in 2006. Its south facade consists of a double-facade, allowing natural ventilation even at high floors. Next to the high-rise structure, part of KölnTriangle is also a much larger 6-storey office block with a total gross floor area of 84.300 m².
KölnTriangle is headquarters of the European Aviation Safety Agency (EASA). The top floor and roof houses a publicly accessible observation deck with panorama views all over Cologne, in particular Cologne Cathedral, directly opposite the Rhine."