Six fire engines and around 40 firefighters were called to a fire at a derelict building on Streatham High Road.
Part of the lower-ground floor was damaged by fire. There were no reports of any injuries.
The Brigade's 999 Control Officers used 999Eye to live stream the blaze from a smart phone to screens in the Control Room, allowing for greater visibility of the incident.
When a 999 call is received by the Brigade, the caller may be asked if they would like to provide a live video stream of the scene using their smartphone. The Control Officer will send a text message with a secure, one-time-use link that opens a live stream direct from the phone to the Control Room. 999Eye provides better situational awareness and allows us to offer the best advice based on live footage.
The Brigade was called at 1639 and the fire was under control by 1828. Fire crews from Tooting, West Norwood, Norbury, Brixton and surrounding fire stations attended the scene.
The cause of the fire is under investigation.