St. Mary's Catholic High School is a private, Roman Catholic high school in Phoenix, Arizona, United States. It is located in the Roman Catholic Diocese of Phoenix. History Saint Mary's High School was the first Catholic high school in Arizona, and has been part of the Greater Phoenix Metropolitan area since 1917. St. Mary's was founded by the Sisters of the Precious Blood. The founders set aside classroom space for four boys and ten girls at St. Anthony's Elementary school. This was the beginning of the Saint Mary's community. In 1920, Saint Mary's moved into its first, one-story home located on East Monroe Street. In 1928, all male students were transferred to Brophy College Preparatory School on North Central Avenue, leaving Saint Mary's school an all-girls facility. The Great Depression caused financial problems, leading to the closure of Brophy in 1936. The boys were temporarily without a Catholic high school. Male students moved back to St. Mary's, but this time into a new building. During the 1930s, one city block, bordered from Polk to Taylor and Second to Third Streets, had been purchased for $24,000. With this new land, a second Saint Mary's was built by the Franciscans whose goal was to educate those boys displaced by the closure of Brophy High School. The separation of boys' and girls' schools lasted until 1958. By the end of 1958, the girls' school was condemned to make way for the Civic Plaza. Both schools were combined, making it mixed-gender once again. As a result of boys and girls attending the same facility, it became necessary to add classrooms. On March 20, 1961, Reverend Francis J. Green, O.D., Bishop of Tucson, performed the dedication ceremony for the new seven-room addition to the school, including a ramada and a library. The Polk Street campus, built on , had a total of twenty-four classrooms and a gymnasium. There was a maximum of six hundred students, from very diverse backgrounds. The student body was approximately 90% Hispanic, 0% Anglo and 10% African American. The ravages of time and the rapid development of downtown Phoenix caused Saint Mary's to halt its growth on their inner-city campus. In 1988, Saint Mary's was razed to make room for the Arizona Center. The school moved to its present location at Third Street and Sheridan, renovated existing buildings, and constructed a multi-purpose building to house administration, classrooms, and a cafeteria. In