The Ubiquitous Chip, one of the city’s best known restaurants, has been run by the Clydesdale family since 1971.
The three venues will be operated by Greene King’s Metropolitan Pub Company subsidiary, which operates 71 pubs in and around London.
Michael Horan, managing director of Metropolitan Pub Company, said: “We are really excited to welcome these iconic sites to the Metropolitan estate, and continuing the legacy that the Clydesdale family has built over the last 50 years.
“We are looking forward to working with the 145 team members to continue providing the world class hospitality to the people of Glasgow.”
Colin Clydesdale, who ran the business with wife Carol, said: “After much consideration, we decided to sell the business that has been in family ownership since 1971.
“I truly believe the business and people will be in safe hands with Michael and the team, who will continue the legacy that we have built. We look forward to visiting as customers for many years to come.”