David Chipperfield Architects’ redevelopment of the former US embassy in Grosvenor Square has taken a significant step forward with the appointment of a main contractor.

Multiplex has won what is being described as one of the biggest London building jobs to be awarded this year, according to Building Design’s sister magazine Building.

It revealed that the firm is now preferred bidder for Qatari Diar’s £400m scheme to turn Eero Saarinen’s former embassy on the west side of Grosvenor Square in Mayfair into a luxury hotel, having beaten remaining rival Balfour Beatty.

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