I would have also said Union Station (ala, Apple Store Grand Central), but it's less realistic - and I can't think of a suitable spot for one. The one in Grand Central is... odd. It doesn't even feel like an Apple Store proper, and to me it's more along the lines of a pop-up store that so happens to be in Grand Central, but it's such a unique experience nonetheless.
Perhaps a location in the Dominion Public Building facing Yonge and Front when the future revitalization occurs? Also, I feel like the foot traffic around Yonge-Eglinton could support another store, the podium at E Condos is a grand space, but... reserved for another TD
![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- maybe something on the other two corners in the future
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
... All this being said, Apple has their grounds pretty well covered as far as retail locations are concerned around the city. I think two locations for downtown is sufficient in their minds.