Firefighters respond to the 300 block of Lake Street in Crystal Lake for a structure fire call at an apartment building Thursday evening. | Photo: Alex Vucha / Lake and McHenry County Scanner

All four units of an apartment building in Crystal Lake were deemed uninhabitable after a fire Thursday evening, officials said.

The Crystal Lake Fire Rescue Department responded around 6:17 p.m. Thursday to the 300 block of Lake Street in Crystal Lake for a report of a structure fire.

Crystal Lake Fire Chief Paul DeRaedt said a resident of one of the apartments was alerted by her smoke detector that activated.

She saw smoke in the hallway upon investigating and called 911.

The occupant of the apartment where the fire started was able to exit the apartment safely. The building was not equipped with a fire sprinkler system.

Firefighters respond to the 300 block of Lake Street in Crystal Lake for a structure fire call at an apartment building Thursday evening. | Photo: Alex Vucha / Lake and McHenry County Scanner

Firefighters arrived on the scene within five minutes and found flames coming from one of the apartments on the second floor of the two-story building.

Fire crews entered the apartment and found heavy smoke conditions and a fire in a bedroom. The fire was declared under control at 6:38 p.m.

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The bedroom sustained heavy fire damage and the remainder of the apartment sustained smoke and water damage, DeRaedt said.

Adjacent apartments also received smoke and water damage.

Firefighters respond to the 300 block of Lake Street in Crystal Lake for a structure fire call at an apartment building Thursday evening. | Photo: Alex Vucha / Lake and McHenry County Scanner

The entire four-unit apartment building was deemed uninhabitable until cleaning and repairs can be made.

The American Red Cross is assisting the residents with temporary shelter. The cause of the fire is under investigation, DeRaedt said.

Damage to the apartment is estimated at $100,000. There were no injuries to any firefighters or residents.

The Crystal Lake Fire Rescue Department was assisted by several area fire departments along with the Crystal Lake Police Department.

Fire investigators from the Algonquin-Lake in the Hills Fire Protection District are assisting Crystal Lake with the investigation.