A series of stepped volumes create 10,000 ft² (930 m²) of private outdoor roof terraces that enjoy views of Swiss Re and the City skyline. Use of the rooftop gardens is extended by a light and open, ETFE-clad structure.
Environmentally, wall-to-wall depths are optimized to achieve excellent daylight penetration. South facing balconies are cantilevered to protect the interior from solar gain overlooking the new plaza below. The new building is highly efficient at many levels. For instance, it reuses and adapts the existing below ground structure, some 50% of the existing building – an approach that has been successful on other Fletcher Priest projects. The spare structural capacity and the embodied energy of the existing structure are not wasted, resulting in savings with reduced risks and less disturbance during ground works.
Recycled glass facades with its distinctive green tint contrasts with the clear transparency of the low iron windows. This exceeds current energy saving requirements by 40% and links architecturally to the faience and proportions of Holland House.