The Cathedral school building, which was built in 1920, houses the diocesan Office of Hispanic Ministry, parish religious education and many of the services of Catholic Charities, including the Help Center (providing food, case management and financial counseling to the poor), Community Counseling Services (providing adoption services, pregnancy counseling, marriage enrichment and family support across the Diocese), the Foster Grandparent Program (mentoring children and enriching the lives of senior citizens) and Immigration Services (providing interpreter services, immigration paperwork and consultation).

The Cathedral gymnasium was added to the school in 1922. The gym along with its adjoining kitchen, conference rooms and classrooms are used by parish and diocesan groups seven days a week for faith formation, meetings, luncheons and social functions.

The building that houses parish offices and rectory was built in 1923 and at one time served as the Chancery offices of the Bishop. This building is a priests' residence and office space. It houses some historic artifacts owned by the Diocese and often provides the only space for wedding parties to prepare for ceremonies.