After the establishment of the Diocese of Orange in 1976, the school served students from that diocese. By the 1994-1995 class, enrollment was down to 150 students and the campus was being shared with nearby Alemany High School, whose campus had been damaged in the Northridge earthquake. Due to the decline in enrollment, the lack of students advancing to the priesthood, and the increasing financial pressure on the archdiocese, the decision was made to close the campus, effective July 1, 1995. Due to its mission style architecture and manicured grounds, OLQA and the adjacent San Fernando Mission were popular locations in several television and movie productions: