The second largest part went to Sony, who erected their new European headquarters on a triangular site immediately to the north of Daimler-Benz and separated from it by the re-routed Potsdamer Straße. This new Sony Centre, designed by Helmut Jahn, is an eye-catching monolith of glass and steel featuring an enormous tent-like conical roof, its shape reportedly inspired by Mount Fuji in Japan, covering an elliptical central public space up to 102 metres across, and thus differing substantially from Hilmer & Sattler's original plan for the site. Its 26-storey, 103-metre-high Bahn Tower is so named because it houses the corporate headquarters of Deutsche Bahn AG, the German state railway system.