Redwood City firefighters and Red Cross personnel responded to a second alarm fire at 522 Roosevelt Avenue early Thursday morning.
The fire, which is still under investigation, "completely destroyed" one unit and extended into the attic, according to Deputy Fire Chief Greg DaCunha, who said that as many as 29 other residents were displaced. Firefighters were called to the scene just before 4 a.m. and were able to contain the blaze in a little over an hour.
No civilians or firefighters were injured in the incident.
The Redwood City Police Department issued a news release at 4:47 a.m. urging the public to avoid Roosevelt Avenue early Thursday west of El Camino Real between Clinton and Fulton streets. The police advised the public that the situation could last for an extended period of time.
Roads were opened just before 10 a.m. Thursday morning.
Bay City News contributed to this report.