The City has on several occasions encouraged a developer to buy adjacent properties if they want a particular GFA or massing. King Blue is an example of where that happened, and the developer followed through by purchasing one more (non heritage) building to the east of the original assemblage on King. Sometimes the requests from the City have more to do with preserving a hoped-for tower separation than it does density on the lot itself. One of the sites up on Broadway or Erskine (I forget which) had a corner lot holding out, and for the sake of aesthetics and general good planning, the City urged that developer to pay a little more and get that lot too. They did. (
@someMidTowner, do you remember which one that was without me having to search?)
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