Design company Reef Group has unveiled plans to expand an area of Cavendish Square in central London with an investment of £100 million.

First landscaped in 1729, Cavendish Square is one of London’s original Georgian squares.

The development aims to expand the footprint of the Harley Street medical area and deliver specialist facilities for London’s growing independent healthcare market.

The area is currently an underground car park but is expected to be redeveloped to create a mix of retail, medical, wellness and leisure accommodation.

The plans will see the creation of 280,000 square feet of space across four storeys below ground level.

Plans for the scheme, named Cavendish Square London, have been submitted to Westminster City Council and are subject to planning approval, with a planned start date of 2020 and an estimated completion date of 2022.

Reef Group says it is in discussions with a range of potential occupiers.

Stewart Deering, joint chief executive of Reef Group, said: “The historic Georgian square will be restored to its former glory, becoming more accessible to the public than ever before with improved public realm. Cavendish Square will become an oasis in the heart of London and as well as providing an interesting mix of occupiers, we hope the plans will encourage more public events to take place within the square.”