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gsw headquarters building, Berlin

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The brief was for a £73 million extension to a 1950s headquarters tower block for gsw, a social housing group. Sauerbruch Hutton's extension provides 30,000m2 of offices, shops and public areas and wraps the existing building in three sculptural forms: a fin, an oval cylinder and a rectilinear block. The low-energy concept is founded on six basic characteristics of the building which have been generated through the form and orientation of the plan, in combination with the west facade which has been designed as a solar flue. The scheme will be finished next year.

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