Richard Corrigan will continue to run the restaurant on the 39th floor of 30 St Mary Axe in the City of London, following the purchase of the building by German property firm IVG Immobilien and UK investment house Evans Randall for £600m.
Norman Foster designed the building, nicknamed the Gherkin, to maximise natural light.
"The restaurant is extraordinarily successful, the new owners are incredibly happy," said Corrigan.
"They have signed for the whole five-year period."
Michael Lynch is currently the Head Chef at the 65-cover restaurant, which is only open to building occupants and their guests.
Although it is available for corporate hire for nonresidents, Corrigan said that here are no plans to open the restaurant to the wider public.
Former owner Swiss Re, the Zurich-based global insurance giant, which originally commissioned the £138m landmark creation in 2003, is expected to retain 50 per cent of office space until 2031.