Key to the new headquarters’ ecological concept is the glass roof which curves around the floor plates to create the atriums in the V-shaped “gaps` of the building wings. The landscaped winter gardens on the valley side are unheated and act as climate buffers. In contrast, the atriums on the boulevard side serve as circulation spaces; hence temperatures have to be kept at a comfortable level. Both winter gardens and “warm` atriums are naturally ventilated through openable flaps in the shell to draw fresh air into the building and to reduce heat gain especially in the summer months. The entire office space benefits from natural light and outside views. Mechanical systems such as lighting, sun shading, heating, cooling and ventilation can be controlled individually. Excessively wasteful behaviour is still being avoided as individual settings are reset to the most efficient levels several times a day by the central control unit. Staff members can open their windows to the atriums and winter gardens or to the outside at almost all times. The architects and the client place great importance on the green performance of the building. Therefore, having the new headquarters environmentally certified seemed a logical conclusion.