The tech giant, which already rents around 40% of the Renzo Piano-designed building near Oxford Street, has agreed a deal to buy the development from Legal & General Group and Mitsubishi Estate.
A new UK headquarters building for Google is currently under construction at Kings Cross.
The 11-storey block, designed by Heatherwick Studio and Bjarke Ingels Group (BIG), will provide one million square feet of office space, of which around two-thirds will be taken by Google.
The investment is part of a wider strategy to boost Google’s UK workforce capacity to 10,000 employees. The firm currently has 6,400 staff in the UK.
