EL CAJON (CBS 8) - Fire crews extinguished a residential structure fire in the 300 block of West Park Avenue in El Cajon, according to Heartland Fire & Rescue.

Two of the four units were destroyed by the fire, a third was partially damaged. Damage has been estimated at $300,000, this includes structure andcontents.

Four families have been displaced by this fire and the American Red Cross will be assisting them with temporary shelter.

There are no reports of injuries.

Crews were able to put out the fire in 40 minutes.