Henderson’s Greater Vancouver City Directory, 1913, Part 1, page 399 (3616 West Fifth Avenue)
Donald J Gunn was a confectioner at 1974 Georgia Street in 1913.
He lived at 3616 West 5th Avenue in 1913, along with D.G. Gunn, who was an agent for the Canadian Pacific Railway.
There was also a Donald James Gunn (1876-1965) who was an agent for the Canadian Pacific Railway. However, it is not clear if he is connected to the confectioner at 1974 Georgia Street.
No further information is available at this time.
“British Columbia Death Registrations, 1872-1986; 1992-1993”, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FLTP-B6B : accessed 1 December 2015), Donald James Gunn, 1965.