The seven-storey, 5,400 square metre prime retail and office development includes lower ground, ground and first floor retail space with five storeys of office and event space above.

A complex three-storey basement provides retailers with a lower ground floor and two levels of basement beneath.

McLaren’s top-down construction programme will enable the site team to keep to programme in a busy area of Mayfair.

McLaren will cast the central section of the ground floor slab to enable the cores to be built at the same time as excavating down and casting the basement floor slabs and liner walls.

An extensive temporary works scheme includes 33m deep 1.2m diameter piles and 15m steel plunge columns to support the cores and ground floor slab, allowing the basement box and jump forming of cores to happen simultaneously.

McLaren has worked closely with the City of Westminster to develop a logistics strategy and traffic management plan to minimise impact on the local road network.

A large-scale temporary ramp allows deliveries down to site level from Grafton Street and gives access for the piling rig and crawler crane. Just in time deliveries preserve limited material storage space.

The Grade II-listed shopfront of Wartski jewellers at 14 Grafton Street has been dismantled and will be reassembled in Barlow Place during a later phase of the redevelopment. The final mixed-use redevelopment of the site between New Bond Street, Grafton Street and Bruton Street will feature new homes, a hotel, office and retail space, bars and restaurants.

McLaren Construction’s Managing Director London & South, Darren Gill, said: “There is a deep and complex basement to be constructed before this beautiful new building rises above Grafton Street.

“We know from considerable experience of working in the Oxford Street area that this technical feat will be pulled off in a tight site surrounded by a lot of activity. Occupiers and passers by will see a smart new addition to the West End without ever realising how precisely planned and engineered it needs to be.”