St. Mary’s Cathedral complex is exceptionally valuable for its continuous nearly 150-year use and ownership by the Roman Catholic church and since 1913, as the primary religious institution for the Diocese of Calgary (Institutional Value – City Wide Significance).
The Cathedral complex is significant for the outstanding Modern and Gothic Revival design of St. Mary’s Cathedral, built 1955-57 (Style Value – City Wide Significance).
The Cathedral complex has activity value as the epicenter of collective religious experiences of the Francophone settlers and later general Catholic community in Calgary (Activity Value – City Wide Significance).
The Cathedral complex has significant landmark value for its prominent siting with unimpeded sightlines of the church from 1 Street SW, its spectacular Gothic-inspired architecture with Modern styling, and its strong continuous ties to the Roman Catholic congregation in Calgary (Landmark Value – City Wide Significance).