The three underground 'ghost' station sites – the first of a proposed 26 throughout London – are Camden Tunnels, 206 Brompton Road and Down Street.
The sites will be open as tourist attractions during the day and available for private hire in the evening for drinks receptions and parties. Until now, only a few small groups a year see the tunnels on TFL-led tours.
During the Second World War, Down Street, which lies on the Piccadilly line between Green Park and Hyde Park Corner, served as an underground bunker for Winston Churchill and his war cabinet.
The enterprise is the creation of Ajit Chambers, founder of The Old London Underground Company, following four years of planning to establish a consortium to acquire a lease for the sites.
Chambers said: "We have been approached by Sony, Microsoft, Land Rover and Harvey Nichols. Big corporate brands are interested in branding the space. We will run tours for architect and construction students during the construction and development stage, which could take nine months."