Agreed, although that isn't really Old Montreal. By themselves, none of those buildings are particularly significant, but within the context of the location they add to the post industrial lofty feel of the hood. That pile of dreck adds nothing.
I know it isn't that simple but there are heaps of vacant parking further up between William and St-Maurice. I'd love to see that developed without whacking out existing structures.
Makes you wonder why they didn't simply extend this building right out to Wellington. Probably some asshole holdout who refused to sell so they just said "Fine, fuck you."