Tonkin Liu has submitted plans to transform London’s Grosvenor Square into a carbon neutral urban garden with a biodiversity net gain of 15.5%.

The architect worked with horticulturalists Nigel Dunnett and Gary Grant to come up with a design that it said would increase the number of plant species in the West End by 500%.

Property group Grosvenor Britain & Ireland, which manages the square as part of the Duke of Westminster’s multi-billion-pound property empire, has submitted the plans to Westminster council hoping the Mayfair square’s redesign will be completed in time for its 300^th anniversary in 2025.

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