Swiss Re United Kingdom. In Asia, the group has offices in the following countries: Australia, China, Hong Kong, India, Japan, Malaysia, Singapore, South Korea. There are also offices in the Americas: Barbados, Brazil, Canada, Mexico and the United States. Swiss Re is headquartered in Zurich where the parent company’s main premises has stood on the shores of Lake Zurich since 1864. Its London office is located in the award-winning 30 St Mary Axe tower, which opened on 25 May 2004. 30 St Mary Axe is London's first environmentally sustainable tall building. Among the building's most distinctive features are its windows, which open
30 St Mary Axe of the building during the summer and warm the building in the winter using passive solar heating. The shafts also allow sunlight to pass through the building, making the work environment more pleasing, and keeping the lighting costs down. The primary methods for controlling wind-excited sways are to increase the stiffness, or increase damping with tuned/active mass dampers. To a design by Arup, its fully triangulated perimeter structure makes the building rigid enough without any extra reinforcements. Despite its overall curved glass shape, there is only one piece of curved glass on the building, the lens-shaped cap at the apex.