Institutional seats of the European Union are based in Luxembourg City along with the European Investment Bank. The Economic and Social Committee and the Committee of the Regions are entirely based in Brussels while the European Central Bank is based in Frankfurt and Europol is the only agency to have its seat fixed by the treaties, in The Hague. Separately, the Treaty of Nice establishes Brussels as the venue for all formal summits of the European Council after 2004. However some extraordinary sessions are sometimes held outside the city. The European Council's seat is however fixed by a declaration rather than a protocol, meaning it is
European Free Trade Association Belgium (the same location as the headquarters of the European Commission), while the EFTA Court has its headquarters in Luxembourg City (the same location as the headquarters of the European Court of Justice). Except for Switzerland, the EFTA members are also members of the European Economic Area (EEA). The EEA comprises three member states of the European Free Trade Association (EFTA) and 28 member states of the European Union (EU), including Croatia which is provisionally applying the agreement pending its ratification by all EEA countries. It was established on 1 January 1994 following an agreement with the European Community (which