Starting with the 2003-2004 academic year, the nearby middle school (Crone Middle School) was converted to house the freshman class in an effort to alleviate overcrowding. From that point on, the freshmen attended class at the Freshman Center, and the Main Campus housed only the sophomore, junior, and senior classes. A third building that was completed around 2007, the Frontier Campus, allowed seniors to receive dual credit for classes from the College of DuPage. These students attended class in block sessions with no classes on Friday. It allowed for independence and freedom. Seniors from Waubonsie Valley High School also participated in the program. The Frontier Campus option was closed in 2012.