The Curzon auction included the cinema group’s distribution arm, Artificial Eye, as well as its home streaming service.
Mr Cohen’s US cinema group, Landmark Theaters, has also been put up for auction, while he has already lost control of an office tower in New York’s Midtown.
But the legal dispute has escalated in recent weeks after Fortress accused Mr Cohen of trying to shield his assets from the court order.
In a filing in the New York Supreme Court, Fortress alleged that Mr Cohen transferred $70m worth of assets to new owners. This included moving a $20m mansion in Greenwich, New York, into his wife’s name, and transferring ownership of at least four luxury yachts worth $50m.
Mr Cohen is appealing the judge’s ruling and for the $187m liability to be reversed in full. Cohen Media Group has been contacted for comment.
Mr Cohen bought Curzon in 2019, a year after buying Landmark Theaters in the US. The cinema chains were used as collateral on the Fortress loan, alongside the Manhattan tower, a design centre and a Florida hotel.
The acquisitions came shortly before lockdown forced widespread cinema closures and pushed the sector into crisis. Cinemas are also struggling with the shift to streaming, as attendance continues to fall short of pre-Covid levels.
Curzon was set up in 1934 by Harold Wingate, who opened his first cinema in Mayfair. It became known for introducing audiences to international cinema by importing and screening some of the first foreign language films in the UK.
Artificial Eye, which was founded in 1976, has been behind major hits including 2019 South Korean blockbuster Parasite. Curzon was also ahead of the curve on streaming, launching its home cinema streaming service in 2010.
In recent years, the chain has opened new cinemas in locations including Hoxton, Camden, Kingston upon Thames and Canterbury.
Fortress, which also owns Punch Pubs, said its acquisition secured the jobs of more than 350 employees.
Allison Swayze, managing director at Fortress, said: “Curzon is an iconic film company, with global recognition for its long legacy of releasing and connecting independent and critically acclaimed films to UK audiences.
“We’re pleased to acquire Curzon, and bring our support to the company’s dedicated team. Curzon has exciting near-term plans which include expanding its cinema footprint, and delivering awards and release plans for an exciting slate of films.”