Apartment Building, Residential Rockford, IL – Electrical fire at apartment complex limited by sprinkler system July 26, 2015 viking210 An electrical fire damaged a Northwest Rockford apartment complex. It started shortly after 4pm Thursday afternoon at the Riverside Apartments in the 3700 block of Trilling Avenue. Investigators say that an electrical problem sparked a mattress that set fire in a lower level unit. According to the District Chief the apartment had a working sprinkler system that kept the fire from spreading. No one was hurt but one person has been displaced.