The fire was in the 10500 block of Irma Drive in Northglenn.
According to officials, the first call of the fire came in at 8:55 a.m. and the second alarm went off around 9:30 a.m. Fire departments from North Metro Fire Rescue District, Thornton and Westminster responded with multiple engines to try and extinguish the fire.
The building was evacuated once fire officials got on the scene.
The Red Cross and victims advocates were on the scene helping victims.
The cause of the fire is unknown at this time.