The reason development along Parliament in Harbour Landing is a mixed-bag is because those parcels fall within the NEF (Noise Exposure Forecast) overlay due to proximity to the airport. This constrains residential uses but where other commercial or industrial uses are still permitted. It's not surprising how it developed out and in fact was always expected if you go back to the original site plan.
https://www.regina.ca/export/sites/R...st-Overlay.pdf