The project will see Willmott Dixon demolish a six storey building behind a retained façade at 5-7 Giltspur Street before starting on a .
steel-frame seven-storey replacement.
Work will complete in October next year and will provide 47,000 sq ft of new office space behind the frontage.
It will bring back to life a vacant property that was previously a mixed development comprising of a public house, apartments and offices.
In central London, Willmott Dixon is also fitting-out new retail space over four floors for leading fashion brand McQ in Dover Street and creating a new spa for the Mandarin Oriental Hotel in Knightsbridge.
Other Willmott Dixon projects in the capital include the £86m Woolwich Central for Tesco develop Spen Hill and new estate regenerations in Bermondsey and Tottenham.