Original photo from Ross Dunn. Original photographer unknown.

The original shot was taken from a location that is no longer accessible. These shots were taken from about 23 feet above street level. The camera was mounted on top of an eleven foot monopod held above the head from the 5 foot ledge next to the driveway.

Ottawa Past & Present: Rideau Canal and the old post office

Lost Ottawa – Tearing down the old Central Post Office, 1930s

Montreal Gazette, June 24, 1938 Old Post Office Razed After Service of 62 Years

Wikipedia: Confederation Square