Quote:
Originally Posted by OldDartmouthMark
Your diagram raises a new question, though... why was the Nova Centre exempted from the view plane rule? It clearly blocks VP6 and I can say it pretty much blocks most views of anything from behind it. Curious if it was made a special case for political reasons, or if I just don't understand the view plane requirements.
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So the viewplanes also have a vertical component to them (which obviously doesn't show up on a 2D image from above). They're basically a sloped plane measured from 6' (human eye) above the ground at certain points on Citadel Hill, down to a different elevation at other points of interest (George's Island, harbour mouth, etc.). Since Citadel Hill is a high point, and most of the end points are at sea level or close to it, there is space underneath the view planes.
On the Nova Centre you can see this in the location of the convention centre (under the viewplane) and the angle of the south-east tower. That same viewplane goes down over the Metropark building, which is basically built up as high as it can be underneath that viewplane.
Google Maps doesn't allow you to get to the exact vantage point, but you can basically see the effect here:
EDIT: To your other question, there are maximum heights set within the Downtown Halifax Plan (and basically every other planning document). They are set for a variety of rationales: shadowing, desired built form, economics, etc. I don't know what the rationale was for the the Sackville-South Park block. It is worth noting though that the Pavillion + Curve site originally had a lower maximum height, but they got Council to amend that height based on the inclusion of the YMCA as an "exceptional public benefit".