The fire started about 9 p.m. in a second-floor fireplace and was quickly extinguished, leaving damage only to the walls and ceiling, according to the Chicago Fire Department.
A tweet from the fire department said no one was injured and that patrons were evacuated safely.
Spokesmen for the police and fire departments would not clarify whether the Gold Coast restaurant was seating outdoor or indoor diners. Statewide Tier 3 coronavirus restrictions and the local stay-at-home order — recently extended to Jan. 22 — ban indoor seating.
The Business Affairs and Consumer Protection is investigating any possible coronavirus restriction violations, according to agency spokesman Isaac Reichman.
However, the agency had already investigated Gibson’s less than a week before the fire and found them in compliance with COVID-19 regulations, Reichman said in an email.
He noted that, while indoor dining is prohibited, indoor tables are allowed if they were within 8 feet of a wall that is 50% open to the outdoors.
A Gibson’s spokesperson did not immediately respond to a request for comment Thursday afternoon.