Commerzbank Headquarters by Foster + Partners 

Commerzbank Headquarters
Frankfurt, Germany 1991 - 1997
The Commerzbank was the world’s first ecological high-rise tower. Natural ventilation prediction was 65% of the year. Actual use of natural ventilation is 85% of the year with air conditioning switched off. Winter gardens linked to a central atrium spiral up the tower to become the visual and social focus for the clusters of offices.
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