What is "diamanten"

Diamanten ("The Diamond") or Oksenøyveien 3 is an office building located at Fornebu in Bærum, Norway. It was built in 1985 as the head office of the airline Braathens SAFE, and later became the head office of SAS Braathens. As of April 1, 2010, it has been the head office of Norwegian Air Shuttle.