According to San Francisco fire Lt. Robert Lopez, the blaze was reported around 9:50 a.m. near the intersection of Clarendon Avenue and Laguna Honda Boulevard. That's next to Laguna Honda Hospital.
Lopez says firefighters attacked the flames and were able to contain the fire around 10:50 a.m.
Crews will remain on scene to check for smoldering spots.
No structures or vehicles were damaged in the fire. One firefighter sustained minor injuries.
The cause of the blaze has not been determined.
(ABC7 News contributed to this report)