TOD isn't economically feasible in Calgary if it isn't 4-6 storey wood-frame buildings. Even townhouses would make more sense. This is largely because the cost of new condos and rentals downtown aren't commanding a high enough $/psf in comparison to new build suburban counterparts if its concrete construction. If downtown land was more filled in and more scarce, and downtown condos commanded higher $/psf compared to what a concrete new build on a TOD site cost, it would make sense to develop in larger numbers.
Basically, Calgary modelled TOD after Vancouver, which has very different market conditions. $/psf on condos downtown Vancouver became prohibitively expensive so people started building in Metrotown, Coquitlam, Surrey Central, New West, etc. because the $/psf was lower than downtown and a market was there when factoring in the cost of constructing concrete highrises.
Calgary's prices aren't high enough downtown for it to make sense to do TOD development in concrete. If we want TOD we should consider densities that support wood-frame development, as price points might be reasonable enough to be cost competitive at that point.
TLDR; Calgary isn't Vancouver and should do low-rise TOD like in American cities to make it cost competitive with downtown $/psf.