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
Institutions of the European Union of seats in the parliament were also changed to a formula system. The High Representative merged with the European Commissioner for External Relations and joined the Commission. The appointment of the Commission President became dependent upon the last EU elections. The Council of Ministers adopted more qualified majority voting and the European Council was made a distinct institution with a permanent president. The Court of Justice had some minor renaming and adjustments. In addition, the central bank became a full institution. There are three political institutions which hold the executive and legislative power of the Union. The Council of the