SP!RE
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The side of the heritage facade has to be a solid surface - otherwise it would destabilize the appearance of the facade - it would look like it is freestanding at the sidewalk - making the facadism even more apparent.
Exactly. Well put.
Such an idea could work well but using solid filler makes the "heritage facade" seem more stand-alone. Pedestrians won't be as tuned in to how it is part of the tower and even if they are, it will look more cohesive to them.