Chopper7 was over the scene in the 7800-block of Woodward Avenue just before 7 a.m.
Firefighters appeared to have controlled the fire, but the roof of one of the buildings in the complex was completely destroyed.
Drivers are urged to avoid the area. As of 7 a.m., Woodward Avenue was blocked south of 75th Street.
Darien-Woodridge Fire Chief Steven Gorsky said no one was injured. It's not clear how many residents have been displaced.
Woodridge police said the fire began just after 3 a.m.
This is a breaking news story. Check back for updates.