The practice is expected to make a full application within months for its extraordinary proposals for London's Marble Arch.
It is currently awaiting the go-ahead - expected imminently - to work up a detailed design of the scheme that will massively increase the public realm on the site and possibly move Marble Arch itself.
The project, a masterplan for one of the West End's principle gateways, is intended to redress the balance between pedestrians and surface-level transport at the site.
According to the architect, the pedestrian environment is to be significantly improved by making movement more generous at street level and by reconnecting the arch and Speaker's Corner to the adjacent public realm.
The architect has been working on the project since March.