Excerpts from the DailyHerald.com:

Des Plaines firefighters were called at 11:13 a.m. to an activated fire alarm at a six-story condo building on the 1300 block of Brown Street. The fire was well-advanced within a top-floor unit and smoke was spreading down the hallway. 

Crews launched an attack on the blaze, extinguishing it within 20 minutes. Sprinklers helped keep the fire under control and limited the damage to other units.

Residents safely evacuated the building and no injuries were reported. Most residents were able to return to their condos in the afternoon. Beyond the unit where the fire started, some other units experienced water and smoke damage. The cause is still under investigation.

From a reader:
It was a good fire, 1 line was stretched, 1 unit was totaled with fire and smoke damage. Five units sustained water damage below the fire unit.