As the Chamber’s activities expanded and as a result of a growing team, architect Mr Niven proposed that the Chamber should have a building of its own, a symbol for its growing importance. He produced a plan for a building facing Trinity Square on Tower Hill. Thanks to a number of generous donors, e.g. the Gothenburg ship owner Herbert Metcalfe, A. R. Bildt of Stockholm, Dan Broström, Gunnar Carlsson, I. Kreuger of the Swedish Match Company and Members of the Council, it was possible to start the building project. The foundation stone was laid in June 1920 by Count Wrangel in the presence of Hjalmar Branting, the Swedish Prime Minister. A year later the building was completed and formally opened by His Royal Highness the Crown Prince of Sweden, later King Gustav VI Adolf.