I also did some more cross section profiles of suburban arterial roads, seeing how much space where was left over, and remembering what I knew about fietsstraaten from the Netherlands and the dimensions of the kind of stores that StrongTowns suggests, about 16-25 metres per side and multiple levels if possible directly affronting the sidewalk, it made me wonder. Could we actually put those buildings in without acquiring land?
As it turns out, yes. Most of the arterial roads in Edmonton except quite old ones are between 32 and 55 metres wide, which is actually just enough to put down the design I like. Here is a sample design, based on a 35 metre wide profile: