Four fire engines attended a fire at a hospital office building on Glenburnie Road in Tooting, this morning.
A small area of the building was damaged by fire and there were no reports of any injuries.
Around 20 firefighters from Tooting, Wimbledon and Clapham fire stations attended the incident.
The Brigade was called at 0530 and the fire was under control at 0622. The cause of the fire is under investigation.