A fire broke out Sunday night around 10 at the 6S Steakhouse at 6200 W. 21st Street North.
When crews arrived, they found smoke coming from the building.
Firefighters knocked down the blaze quickly, but the restaurant still suffered smoke and fire damage.
Fire officials said damage is estimated to be $70,000. Investigators said the fire started from a natural gas fire feature that ignited inside a wall.
One firefighter was taken to the hospital with a minor shoulder injury.