The striking, monochromatic US Embassy in Oslo, which opened in 1959, was one of only three buildings in Europe by Finnish American architect Eero Saarinen. [...] After moving the embassy out, the US government sold the building in 2017 to Norwegian real estate developer Fredensborg, and it was immediately placed under stringent historic preservation orders. [...] 'We studied old drawings and photos to recreate the architectural quality and atmosphere the building used to have and all the new additions were made to fit in with the old. Almost 80 per cent of the interiors are new but reconstructed from old photos or historic references from that period.'