Civil engineering specialist McArdle is preparing the site for work to start on another tower at The Goodmans Field site.
The McArdle team is breaking up the old foundations of the former RBS cheque centre site which formerly occupied the site.
Berkeley will build four residential towers of up to 23-storeys on the site alongside a 251-room hotel, nearly 9,000 square metres of leisure and commercial space and a 17,778 square metre basement car park.
The scheme has sparked intense competition for work from the industry’s largest concrete frame companies.
Mitchellson started on site late last year on a £3.6m job to build the substructure podium for two of the towers.