The Brighton- and London-based design studio won the project in limited competition against a list of international architects including Cesar Pelli, KPF and Kengo Kuma. It has been leading the project since 2004.
The scheme, located on the south-west edge of the city alongside the Tama River, comprises a total of 400,000m² of retail, office, leisure and residential building, as well as a new city park.
A promenade runs like ribbon throughout the site, unifying the landscape. The individual building designs respond to their specific location along the route, with a bolder use of colour adjacent to the railway station, becoming lighter and more delicate in detail towards the park.
The scheme's references to nature are expressed as stone strata, both as eroding planes within the base plateau and in the stepping form of the low rise buildings.
The project is the first in Japan to achieve LEED ND Gold Standard (Pre-Certified Plan) – equivalent to the UK BREEAM 'Excellent'.