Swiss Re's disappearing natural ventilation

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Here's a cautionary and probably typical tale for post-occupation. Swiss Re was dubbed "London's first ecological building" when it was completed back in 2003, which would lead to up to 50% less energy use than a traditional office. This was partly down to its natural ventilation system. Martin Spring's revisit in today's Building offers the reality - Richard Stead, the current property services director says such savings are "a bit over-ambitious" as now that the building is multi-lease only one occupant (Swiss Re itself) is using natural ventilation. Why so - maximum comfort, tenants that want confidentiality who put up partitions and a lack of financial incentive in energy savings for firms that are paying top dollar rents for grade-a space.