In 1852, The Old Stone School opened as Oswego's first permanent school building, at the corner of Tyler and Monroe Streets. The Old Stone School served all grade levels, ultimately operating as Oswego's first dedicated elementary, middle, and high school. In 1885, The Old Stone School was gutted by fire, and classes were moved to the former Kendall County Courthouse (Which operated as the county courthouse from 1848-1864), where some high school classes had been taking place since 1867. Between 1885 and 1886, the former courthouse was demolished to make way for a new school building. In the fall of 1886, a new building opened as The Red Brick School, which also served all grades.