OAKLAND -- Four residents were displaced from a residential hotel Monday evening after a fire broke out on the fifth floor of the building, fire officials said.

Fire crews responded to the one-alarm fire on the 1400 block of Harrison Avenue about 3:35 p.m., Battalion Chief Emon Usher said. Firefighters were able to knock down the flames within the hour.

All residents managed to escape the burning building, Usher said. One resident was taken to the hospital with a case of hypothermia, likely caused when the sprinkler system went off inside. The water was likely quite cold, Usher said.

The cause of the fire is under investigation, though officials did say it appeared to have started on the fifth floor, Usher said. Estimated cost of damage is about $50,000.

Contact Erin Ivie at eivie@bayareanewsgroup.com. Follow her at Twitter.com/erin_ivie.