Skanska will start work on the City of London’s next skyscraper – dubbed the ‘Scalpel’ – this month.
The contractor was chosen to build the Lime Street Tower, as it is officially known, in July 2013.
It has now formally signed the construction contract, valued at £198M, with client WRBC Development UK.
The building at 52 Lime Street will be 190 metres high, 10m taller than the neighbouring Gherkin building at 30 St Mary Axe.
Architect is Kohn Pederson Fox, while Arup is the engineer.
The scheme will provide 37,000m² of office accommodation over 35 storeys.
Lime Street Tower will be the European headquarters of US insurance company WR Berkley Corporation, which will occupy about 20% of the building.
The project includes a new public space, the re-establishment of Lime Street Square, which was destroyed in the blitz in 1941.
Planning permission for the scheme was granted early last year.
Skanska will deliver the construction and building services.
Construction work is scheduled to finish in 2017.