sentences:  They also designed Östermalmshallen (1889), the indoor market at Östermalmstorg in Stockholm.His largest commission was the Nordic Museum on Djurgården, in North European Renaissance style, which he began in collaboration with architect Magnus Isæus (1841-1890) but continued alone after Isaeus's death in 1890.The building was partly finished for the Stockholm Exhibition in 1897, and completed a few years later.