Siemens City Vienna includes the Siemens Tower, the Nordspange , and the Communication Line. The highlight of this urban design is the 55-meter Siemens Tower. The architectural form of the 12-story building is based on an inviting, open design towards the main entrance at Siemensstraße. A reduction of 1000 tons of CO2 emissions are achieved through energy efficiency measures. In recognition of these accomplishments, Siemens City was awarded the Green Building Certificate of the European Commission and the LEED-Gold certificate of the U.S. Green Building Council.