Construction began on the main building in 1949. Two cornerstones flanking the base of the front stairwell, one reading "AD" and the other "1949" attest to this fact (the cornerstone contains a sealed copper box including financial records and newspaper clippings from the period of the school's construction). The 1951 graduating class from the former Burlington High School graduated on the stage of the Williams High School Auditorium in the spring of 1951, some three months before the new school officially opened.