Main Contractor: Mace
Client: Great Portland Estates
Architect: Lifschutz Davidson Sandlands
Structural Engineer: WSP Group
Contract Value: £15m
Location: Mayfair

The basement box is a two level concrete structure that picks up the foundations to the Brook St and New Bond St structure. Brook St building is a six storey concrete frame. New Bond St building is a seven-storey hybrid structure, with the majority being steel frame supported by concrete cores and in-situ concrete slabs. There is a specific construction sequence required for this building due to the load constraints on the Crossrail box, the Over Site building is a nine storey steel frame structure with a concrete core that is to be constructed ahead of the steel frame.