In 1967, building additions increased capacity at Conant from 1,700 to 2,600 students and Palatine's capacity from 1,000 to 1,800 students. In 1969, an addition to Fremd expanded its capacity from 1,600 to 2,700 students. Schaumburg High School opened in September, 1970. This structure, except for the gymnasium and parking site, was constructed by the Illinois Building Commission, a method of financing made necessary by the district's lack of sufficient bonding power in the late 1960s. Hoffman Estates High School, built to house an enrollment of 2,500 students, opened in 1973 as a freshman-sophomore school in Schaumburg Township.
On October 19, 1974, district residents approved a $22 million referendum which provided funds for a sixth high school; an addition to Schaumburg High School which increased its capacity to 3,000 students; the addition of auditoriums and pools at Conant, Schaumburg, and Fremd High Schools; a pool at Hoffman Estates High School; and a district warehouse.
In 1976, the Board of Education decided that the building housing Palatine High School was unsuitable for future use as a four-year high school. Insufficient land to expand the building for future growth and the cost of needed repairs necessitated that decision. The building was closed in June, 1977.
The sixth high school, located near the intersection of Rohlwing and Cunningham Roads, opened in September, 1977, and was named Palatine High School. The newest building can accommodate 2,500 students.
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