Four fire engines and around 25 firefighters were called to a fire at a derelict office building on Station Road in New Barnet.
Part of the ground floor of the seven-storey building was damaged by fire. There were no reports of any injuries.
The Brigade was called at 2019 and the fire was under control by 2116. Fire crews from Barnet, Southgate and Finchley fire stations attended the scene.