This is definitely an imposing structure proposed for the SW corner of Spadina and Adelaide. But what makes it interesting is the underlying concept, described in their "Planning Rationale" document found via the link on our sidebar. I have extracted here four pages from that document that demonstrate the architectural approach being taken to preserve not just the facades but the two existing heritage buildings intact.
Another interesting aspect of the proposal is the accomodation for pedestrian movement. Back in June 2017, the GDNA was invited to a pre-application consultation meeting at which this point was raised by local residents. Given these plans, the Spadina/Brant/Adelaide/King block promises to be very porous.