Investigators on Tuesday night were searching for the cause of a fire at a controversial apartment building in Englewood. Flames tore through the roof of the top-floor apartment of the building on Perry Avenue near Marquette Road. The building was evacuated and no one was hurt. CBS 2 Political Investigator Dana Kozlov exposed last month that the building is home to 60 registered sex offenders. That is about 40 more sex offenders living in the building than originally thought when CBS 2’s Jermont Terry first investigated in March. They include men like Cayce Williams – who assaulted and murdered a toddler in the 1990s, and who isn’t from Chicago. Englewood activist Andrea Drane said last month that it is unacceptable.