The long standing home of the "Barons of Bay street". Before moving to the stock exchange to the Exchange Tower, this was ground zero of Canada's financial industry. Now it's a kind of museum/gallery devoted to design. They've left the exterior and pretty much built the TD tower around it.
I mostly like to visit this place to use the bathroom and check out the gift shop. You can sometimes find those "one of a kind" items for that hard-to-buy-for relative at Christmas time.
The main floor usually has an interesting free display.