What is "silberturm"

Silberturm , formerly known as Dresdner-Bank-Hochhaus and Jürgen-Ponto-Hochhaus, is a 32- storey, skyscraper in the Bahnhofsviertel district of Frankfurt, Germany. It was the tallest building in Germany from 1978 until 1990. Until 2009 it was part of the headquarters of Dresdner Bank, one of Germany's largest banks until its merger with Commerzbank in 2009. As of 2012 the main tenant is Deutsche Bahn.