The fire, which was reported just before 5 p.m., reached two alarms as firefighters worked to control it. Smoke could be seen from I-280.
Fire officials say the fire appears to have started at 167 Maynard in the kitchen and spread quickly to two adjacent homes.
The fire has been contained and there have been no injuries reported.
@abc7newsBayArea Congdon St is blocked off and traffic is a mess around there— Mark Glaser (@mediatwit) April 29, 2015
2 houses on fire on the Excelsior, Maynard at at Congdon. 4 engines so far. pic.twitter.com/EMBFMyfnwj— Rhiannon Charisse (@rhiannononon) April 29, 2015
We're working to confirm more details.
Stay with abc7news.com for updates on this developing story.