I think the approved height here is tied to the angular plane vis-à-vis Yonge Street.
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I wasn't sure what you were referring to here with the "angular plane", so I did a bit of research. Please correct me if I'm wrong, but is this the concept where any structure built along Yonge would have a first step back height of 80% of the ROW width, and then a 45 degree angle above that first step back? Would that apply to Yonge as well or am I understanding this incorrectly?
Directly east of the site is the Core Area of the Yonge Street Character Area to which an angular plane of 75 degrees taken at a height of 18 metres as measured from the Yonge Street property line also applies.