The Pinnacle, located at Bishopsgate and Crosby Square, forms the apex of the emerging cluster of tall buildings in the City of London. The building spirals from its base to a height of 288 metres. Its geometry is composed of simple sheared cones filleting to tapered planes. The proposal makes a substantial contribution to the public realm, by opening the ground level to pedestrians and linking a number of important urban spaces along Bishopsgate and St. Mary Axe. The Canopy is formed by pulling the snakeskin glazing away from the building, marking the passage entrance from Bishopsgate and grounding the tall form, relating in scale to the smaller buildings opposite. Its shape was extensively tested and reconfigured to mitigate wind for pedestrian comfort. Sustainable systems are integral to the architectural design. The aerodynamic shape improves the performance of the naturally ventilating fa?ade with its snakeskin design. The outer layer of glass protects the sun-shading which reduces heat gain. The glass fa?ade allows ample natural light, reducing the amount of artificial light required. Photovoltaic cells along the spiral collar further reduces energy consumption. A BREEAM prediction assessment indicates that The Pinnacle will achieve an ?Excellent? rating.