PASADENA ( — Firefighters Monday battled a two-alarm electrical fire at a Pasadena apartment building.

The blaze was reported around 11 a.m. in the 600 block of South Pasadena Avenue, across from Huntington Memorial Hospital, officials said.

READ MORE: Grandmother, 4 Children Shot And Killed In Lancaster Home; Father Germarcus David Arrested

The blaze, which took approximately 20 minutes to extinguish, gutted the apartment complex and badly damaged another detached unit. It caused $1.5 million worth of damage to the structure and $300,000 to the contents.

READ MORE: Kim Fields Hopes 'Adventures In Christmasing' Inspires People To Come Out Of Their Comfort Zone

“All these units are uninhabitable,” said Pasadena Fire Department spokeswoman Lisa Derderian.

Four families were displaced, and a 7-year-old black Labrador retriever was resuscitated after suffering from smoke inhalation.

MORE NEWS: Super Lotto Ticket Worth $38 Million Sold At Santa Clarita Gas Station

One person was treated at the scene.