Mount Holyoke College graduate Sarah Chapin, the last principal of girls at Williston Seminary, became the town's first high school principal in 1864. Chapin designed the initial curriculum, and served as principal until ill health in 1891. She retired with the class of 1901 and died that summer. In 1864, Williston Seminary decided to stop offering classes for girls. The town constructed a two-story school for use as the town's first high school. In 1912, the school district constructed a new high school and enlarged this building (then called Park Primary School) using brick salvaged from the Center Union School. It was used as an elementary school until 1939 and again from the 1950s to the 1970s. This building, now called the Memorial Building, is currently being used as municipal offices.