The Eurotheum is a 31-storey, 110 m (360 ft) skyscraper in the city center of Frankfurt, Germany. The building was constructed in 1999 to coincide with the adjacent Main Tower, and is one of a few such in Frankfurt that offers office and residential space. Each floor of the tower has 17,000 m2 (180,000 sq ft) of office space, which was occupied mostly by the European Central Bank as an extension of their former headquarters at Eurotower, Willy-Brandt-Platz until 2015.