Oh, and back to Hearn: I hate to say this because it'll make hawc gloat from the cyber-afterlife, but if it were all about aesthetics, I'm not all that hot on Hearn's smokestack--mostly because, when push comes to shove, it's a pretty utilitarian concrete 70s thing. It's got no Giles Gilbert Scott to it--or, if we want to consider contemporaries, it doesn't have the neo-CN-Tower refinement of the thing on Elizabeth next to Sick Kids. Oddly enough, even if it's technically the most "visible" element of Hearn, it's got less "presence" than the plant itself.
However, it remains a critical, punctuating part of the ensemble--and besides, utilitarian aesthetics be darned, it'd involve an awful lot of expense to get that thing down, particularly if simple implosion is out of the question. So, there's a "green economic" argument for retention, too...