 The ECB previously resided in the Eurotower and, due to lack of office space there, in three other high-rise buildings (Eurotheum, Japan Center and Neue Mainzer Straße 32–36) in the city centre of Frankfurt.The newly built main office building consists of two towers that are joined by an atrium with four interchange platforms.The North tower has 45 storeys and a roof height of , whereas the South tower has 43 storeys and a roof height of .