Silverstone's owner, the British Racing Drivers' Club, is to expand its hunt for investors as it bids to realise its ambitious plans for the future.
With the circuit having secured a long-term deal for the British Grand Prix, the BRDC now wants to ramp up development of its 760-acre site to turn it into a leisure and business complex.
An exclusive agreement reached with one potential group of investors, believed to be from Qatar, is due to come to an end soon without a deal having been concluded yet - and the BRDC has made it clear that it will soon be open to beginning talks with other interested parties.
BRDC chairman Stuart Rolt said: "The commercial potential of Silverstone and the estate is significant and we are seeking external investment, from third parties who share our vision, to help us realise that potential more quickly.
"While progress has, and is, being made with our original preferred partner, negotiations have not yet developed into an agreement. As the period of exclusivity has come to a close we are now speaking to other potential investors."
Rolt added that even if Silverstone was unsuccessful in attracting investors, the BRDC still had the resources available to keep improving the venue.
"If we cannot find a suitable partner, we shall continue with the development ourselves, albeit at a slower pace," he explained.