Keep the cool arched arcade structure, but gut the core and slip a mid century tower in.
... Or ...
just demo it and put up a random rectangle spandrel mess like everyone else.
Too bad they didn't consider the sun position when placing those chairs and umbrellas. They run north-south with the head at the south end. Enjoy your feet in shade and the top of your head burned.
This is Calgary though. The exterior will be 99.99999% complete but the sidewalk will remain closed for 8 more months because the building still needs a single piece of trim.