Mace had been working on the job under a pre-construction services agreement.
Main construction is now due to start on the site next month.
AlloyMtd Group Chief Executive Officer, Tee Kim Siew, said: “We look forward to working alongside Mace to realise our vision for this landmark scheme and see them forge ahead with construction for the new office podium and residential buildings, following the completion of the groundworks and hotel stabilisation.”
Gareth Lewis, Mace’s Chief Operating Officer for Construction, said: “The project’s unique design will make for a complex construction delivery; particularly the engineering behind the three-storey steel truss that supports the two towers.
“We look forward to working closely with AlloyMtd Group and our supply chain partners to overcome those challenges and deliver a project which will leave a lasting legacy for London.”
One Crown Place is situated on the edge of the City of London in the EC2 postcode. As well as the main building project, Mace will also restore the last remaining complete row of Georgian houses in the area, which fronts the scheme.
These will house a clubhouse for the residents, together with a boutique hotel – which will be operated by Bespoke Hotels.
Designed by architects Kohn Pedersen Fox, One Crown Place is scheduled to be completed by the end of 2020.