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KölnTriangle is a 103.2 metres (338.6 ft) tall building in Deutz, Cologne, and a prominent landmark in Cologne
Cologne is Germany's fourth-largest city , and is the largest city both in the Germany Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area, one of the major European metropolitan areas with more than ten million inhabitants.Cologne is located on both sides of the...

. The building was designed by Cologne-based architecture firm Gatermann + Schossig and completed in 2006. It's 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
European Aviation Safety Agency
The European Aviation Safety Agency is an agency of the European Union with offices in Cologne, Germany, which has been given regulatory and executive tasks in the field of civilian aviation safety. It was created on 15 July 2002, and it reached full functionality in 2008, taking over functions...

 (EASA). The top floor and roof houses a publicly accessible observation deck
Observation deck
__FORCETOC__ An observation deck, observation platform or viewing platform is an elevated sightseeing platform usually situated upon a tall architectural structure such as a skyscraper or observation tower...

 with panorama views all over Cologne, in particular Cologne Cathedral
Cologne Cathedral
Cologne Cathedral is a Roman Catholic church in Cologne, Germany. It is the seat of the Archbishop of Cologne and the administration of the Archdiocese of Cologne. It is renowned monument of German Catholicism and Gothic architecture and is a World Heritage Site...

, directly opposite the Rhine.

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