Autostadt is cool, but completely impractical for the site we're talking about. Remember, they're building a condo building first, and a parking garage second - not the other way around.
Autostadt is also quintessentially German. Germans will spend tons of money to travel to the plant in which their car is being built and watch it roll off the assembly line. When you go to Autostadt, you're essentially identifying your car (kind of like a father finding his newborn baby in the maternity ward) and watching it travel down some elevator to await you. It's basically car buying as a quasi-religious experience, and, for better or for worse, Germans have this weird fixation with elevating things to bizarre rituals.
Anyway, the average Toronto driver is not going to stand for two minutes and watch his Chevy Equinox descend down a glass tube; we'll be lucky if the garage looks even remotely like the good stuff in the US that Canadian National posted.