text: Installation in Brussels and early development
  Brussels missed out in its bid for a single seat due to a weak campaign from the Belgian Government in negotiations. The government eventually pushed its campaign and started large-scale construction, renting office space in the east of the city for use by the institutions. On 11 February 1958, the six member states' 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 the /, offices moved to 51–53, Rue Belliard/Belliardstraat on 1 April 1958 (later exclusively used by the Euratom Commission), though with the numbers of European civil servants rapidly expanding, services were set up in buildings on the /, the /, the Avenue de Tervueren/Tervurenlaan, the /, the /, the Rue de la Loi/Wetstraat and the /. The Belgian Government further provided newly built offices on the Mont des Arts/Kunstberg (22, /) for the Council of Ministers' Secretariat and European Investment Bank.