22 Bishopsgate Architecture
The architects for the initial Pinnacle tower were Kohn Pedersen Fox and the developer was Union Investment a fund management company. The height was planned to be 307 metres (1,007 ft), but this was reduced to 288 metres (945 ft) after concerns from the Civil Aviation Authority. Originally known as the 'The Bishopsgate Tower', its name changed to 'The Helter Skelter' in response to the organic spiraling nature of the design.