On June 27, 1886, the school's cornerstone was laid and a bell was placed in the tower of the new St. Mary's School at 10th and Buffalo Streets. On November 2, 1886, the 80 students moved into their new classroom, which included a high school department. Enrollment continued to grow from 250 students taught by six sisters to 440 including the high school by 1896. Many of the students remained for only one, two or three years and then left high school to go to work. However, in June 1894 two students completed four years of study, thus becoming the first graduates of St. Mary's High School.