Cosmopolitan Twarda 2/4

The architect Helmut Jahn designed the Cosmopolitan Twarda 2/4 Tower, a very slender office building in the centre of Poland’s capital Warsaw. The tower reaches a total height of 160 m and comprises 44 storeys. The building also houses 252 52 m² to 350 m² flats. A special feature of the tower is the cantilever on its south side, where the top 37 floors of the building project out by about 9 m. The resulting cantilever is a major challenge.

Slim Office Tower with Cantilevers

The resulting loads are transferred by diagonal supports to the continuous main supports inside the building. The diagonal columns are located behind the façade and extend over 11 storeys each. On the east and west sides of the building there are three such diagonal supports arranged one above the other. In the transverse direction, the building is also stabilised by outriggers, which are also arranged on several levels.

Werner Sobek was responsible for the structural engineering of the project.

Jahn Architecture Inc., Chicago/USA

Planning time
2008 − 2010

Construction time
2010 − 2012

Services by Werner Sobek
Structural engineering

53,000 m²

Epstein sp. z o.o., Warsaw/Poland

Rainer Viertlböck, Gauting/Germany

Nomination for The International Highrise Award 2016

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