Pinewood Group's two biggest shareholders have tentatively agreed to sell the famous film and television studios to a property investor.
The deal depends on Aermont, which runs property investment funds, securing financing in the next four weeks.
Pinewood's 007 stage is one of the world's largest and was used to film parts of Spectre and Skyfall.
Some of Star Wars: The Force Awakens was also filmed at Pinewood in Buckinghamshire. However, Harrison Ford, the actor who plays Han Solo, was injured when the door of the Millennium Falcon closed on him and broke his leg.
Goodweather Investment Management, which is owned by property investors Peel Holdings, and Warren James Holdings, owner of the eponymous jewellery chain, together control 65% of Pinewood Group and have agreed to the cash sale providing the buyer secures financing.
The prospective new owner intends to keep the existing management in place, led by chief executive Ivan Dunleavy.  The company has film and TV studios all over the world including in the US, Canada, Malaysia and the Dominican Republic.
Earlier this year, Pinewood Group retained investment bank Rothschild to examine its strategic options. In the past, it had been constrained from raising additional funding for investment via the stock exchange.
Shares in Pinewood were down 4.8% at 552.1p in afternoon trading.

Nicholas Woods, 41, and Tim Clark, 50, both of Lincoln Close, Erith, were also charged with false imprisonment and actual bodily harm.
They will appear in custody at Bromley Magistrates' Court on Monday.
Police found a second man at the scene with head injuries, who remains in hospital in a stable condition.

Omar Gonzalez, 42, was carrying a knife when stopped by Secret Service officers just inside the building.
On Monday officials said he was also arrested in July with two rifles and a map marking the White House.
The Secret Service says it has stepped up security and launched a comprehensive review of procedures.
Mr Gonzalez, a US military veteran who was decorated for his service in the Iraq war, faces charges of unlawfully entering a restricted building carrying a "deadly or dangerous weapon".
During his court hearing on Monday, federal prosecutors also said Mr Gonzalez was stopped but not arrested in August after he walked past the White House with a hatchet.
Assistant US Attorney David Mudd said that the accused intruder was a danger to the president, and a judge agreed to hold him in jail until a hearing in October.
Video footage showed Mr Gonzalez running across a White House lawn after scaling a fence on Friday.
Mr Gonzalez was only stopped after entering the North Portico doors, the Secret Service said. He was later found to be carrying a 9cm (3.5in) folding knife.
The president and his daughters had just left the White House by helicopter before Mr Gonzalez entered, but White House press secretary Josh Earnest said Mr Obama was "obviously concerned" about what happened.
Immediately after Friday evening's incident the Secret Service increased foot patrols along the perimeter fence, deployed additional surveillance resources, and changed the procedures for ensuring the entrance to the building is secure, Mr Earnest said.
"The president is confident the changes will be properly implemented," he said.
The review of security was initiated by Secret Service director Julia Pierson, who also ordered "the immediate enhancement of officer patrols and surveillance capabilities" around the White House.
In July, police found two powerful rifles, four handguns and other firearms and ammunition in Mr Gonzalez's vehicle along with a White House map when he was stopped in south-west Virginia, a local prosecutor told the Associated Press news agency.
He served in the military from 1997 until his discharge in 2003, and again from 2005 to December 2012, when he retired due to disability, the AP reported.
Family and friends told the Washington Post Mr Gonzalez was suffering from post-traumatic stress disorder after serving as a sniper in Iraq.
An apparently unrelated incident on Saturday saw a man drive up to a vehicle gate in the complex and refuse to leave.
Secret Service agents shut down nearby streets and searched the vehicle for explosives.
Officials said Saturday's incident was an "everyday occurrence".

Blair Alston slotted in following Lee Miller's through ball to give the Bairns the lead but James Craigen quickly fired Rovers level.
Falkirk were ahead again through David McCracken's first-half header.
But the visitors equalised again when Mark Stewart struck against his former club, and though Raith had Kyle Benedictus dismissed they held firm.
Pinewood film studios - home to the James Bond movies - are set to be sold for £323.3m.
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Two men have been charged with murder after a 34-year-old man was stabbed to death in south-east London on Tuesday.
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The man who broke into the White House on Friday evening had 800 rounds of ammunition, a machete and two hatchets in his car, authorities have said.
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Raith Rovers twice pegged back their hosts to secure a Scottish Championship draw at the Falkirk Stadium.