Diamanten was taken into use on 16 December 1985 and was officially opened in January 1986 by Minister of Transport and Communications Johan J. Jacobsen.
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Diamanten ("The Diamond") or Oksenøyveien 3 is an office building located at Fornebu in Bærum, Norway.
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It was built in 1985 as the head office of the airline Braathens SAFE, and later became the head office of SAS Braathens.
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After Scandinavian Airlines System and Braathens merged to create SAS Braathens, Diamanten became the new company's headquarters.
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On 24 February 2010, Norwegian Property announced that they had sold the building to HKB Invest, which is 84% owned by Bjørn Kjos, the largest owner and CEO of Norwegian Air Shuttle.