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
Bodies of the European Union It has 344 members, organised in political groups, appointed every four years by the Council. The European Investment Bank is the European Union's long-term lending institution. The EIB supports the EU's priority objectives, especially boosting sustainable growth and job creation. There are also three inter-institutional bodies: the Publications Office, the oldest one, which publishes and distributes official publications from the European Union bodies; and the two relatively new: the European Personnel Selection Office (EPSO), a recruitment body which organises competitions for posts within Union institutions; and the European Administrative School, which provides specific training for the staff of Union institutions.