Excerpts from abc7chicago.com:

A fire broke out early Saturday morning at the Arden of Oak Brook apartment complex on Royce Boulevard off of Butterfield Road. The fire started after the building was struck by lightning during the overnight storms, according to a letter sent to residents by the leasing administrator.

Crews could be seen using a drone to assess the wide extent of the damage. A large portion of the building was completely destroyed leaving many resident displaced.