Bankenviertel

Bankenviertel is the name of the central business district in Frankfurt, Germany where many banks, insurance companies, and other financial institutions are located. It is the most important German financial hub, if not one of the largest in Europe along with La Défense in the Paris aire urbaine and London's City and Canary Wharf.

Having no official or strict borders, it is commonly defined as the western part of the Innenstadt, the southern part of the Westend and the eastern part of the Bahnhofsviertel. Its most central square is the Opernplatz.

Source: Wikipedia