The terraced roof on the eight-hectare 11-storey building, designed by Thomas Heatherwick Studios and Bjarke Ingels Group (BIG), features areas described as fields and gardens, planted with strawberries, gooseberries and sage. A 200m-long running track and relaxing "pause areas" with meadow and woodland plants are also planned.
The building will house 4,500 Google employees in the first, wholly owned and designed Google building outside the United States.
Other staff-friendly features include a fitness centre with a 25-metre swimming pool, gym, exercise studio and 32m-long sports hall.
Google director of real estate and construction Joe Borrett said: "We are excited to be able to bring our London Googlers together in one campus, with a new purpose-built building that we’ve developed from the ground up. Our offices and facilities play a key part in shaping the Google culture, which is one of the reasons we are known for being amongst the best places to work in the industry."
Construction is due to commence in 2018.