The City of Calgary Inventory of Potential Historic Sites is available at the link below. It is a searchable pdf. The list changes and the pdf is updated every few months.
http://www.calgary.ca/DocGallery/bu/pla ... ventor.pdf
Below is a map and list of Calgary's historic sites which have been 'designated' by the city, province or federal authorities.
http://www.calgary.ca/portal/server.pt/ ... +Sites.htm
See the City of Calgary heritage page for information on how buildings are evaluated and added to the heritage list: www.calgary.ca/heritage