The group has closed its restaurants in Hammersmith’s Broadway Shopping Centre, and on Cowcross street in Farringdon.
Quick-service brand Chopstix is to open in the Hammersmith site, while Japanese concept Buy & Bite has taken the Farringdon location for its second London restaurant.
It leaves Barburrito with only one remaining London site, in Paddington station.
Barburrito partnered with The Restaurant Group's TRG Concessions in January 2018 to expand in to airports.
It has since opened sites in Bristol, Edinburgh, Glasgow and Gatwick airports, and will launch at Manchester Airport next year following a £1bn revamp of the terminal.
Danielle Agami and Gabriella Sether, surveyors at Restaurant Property, both acted for Barburrito and said: “It was a pleasure working with Barburrito and helping them to refocus their business model with two new airport concessions opening at Gatwick and Manchester.
“We were able to find two strong buyers for Hammersmith and Farringdon, that acted quickly, without even having to go to market.”
Barburrito launched in Manchester’s Piccadilly Gardens in 2005 and operates 21 UK restaurants in cities including Leeds, Cardiff and Edinburgh.