 On 11 February 1958, the six governments concluded an unofficial agreement on the setting-up of community offices.On the principle that it would take two years after a final agreement to prepare the appropriate office space, full services were set up in Brussels in expectation of a report from the Committee of Experts looking into the matter of a final seat.While waiting for the completion of the building on Avenue de la Joyeuse Entrée/Blijde Inkomstlaan, offices moved to 51–53 Rue Belliard (Belliardstraat) on 1 April 1958 (later exclusively used by the Euratom Commission), though with the numbers of civil servants rapidly expanding, services were set up in buildings on Rue de Marais/Broekstraat, Avenue de Broquevillelaan, Avenue de Tervuerenlaan, Rue d'Arlon/Aarlenstraat, Rue Joseph II/Jozef II-straat, Rue de la Loi/Wetstraat and Avenue de Kortenberglaan.