This is getting slightly off topic, but there are probably some really cool old basement vaults floating around somewhere downtown. Back in the early 20th-Century the basements of bigger buildings usually extended past the property line and continued underneath the City-owned sidewalks. It allowed for both more storage space and for them to be lit naturally through
prism glass embedded into the walkways. If you've ever explored around Vancouver's Downtown East Side they're a
pretty familiar sight.
They went out of vogue by the Depression and most of Edmonton’s prisms were torn out by the seventies, with the extending portions of the basements often walled-up and filled in with sand or gravel. I do know for a fact that the oldest commercial position of Jasper, between about 96th and 100th, was dominated by the things as evidenced by the amount of sidewalk glass visible in archive photos. While most of the lots along that portion were subsequently redeveloped, there may be some of the walled-in portions lying under the sidewalks. Or in areas that were once home to massive buildings that were demolished but never redeveloped, like the parking lot just west of the Convention Centre.
Apparently the McLeod Building’s basement, though walled in, persisted around until the ‘90s when it was completely removed, and there are rumours that the Gibson Block’s basement may still extend under the sidewalk. I’m sure some others along East Jasper, like the Goodridge Block, may have had them too.