Apart from zoning, I'd like to see relaxed policies around floorplates and angular planes.
Density is one thing, but as we all know, most units in modern buildings are not very livable from a size and layout perspective.
More flexibility in how these towers are built, including larger floorplates, would help with layouts and must definitely be on the menu.
I agree, in theory; the problem we always encounter is precedent. Once an idea is permitted somewhere, for very good reasons, someone else will claim that right elsewhere w/o those same good reasons.
Example. Floor plate limitations, are in part, a function of shadowing and skyview considerations. I view both of these as quite important. But they vary in importance based on other building elements.
If you increase separation distance between tall buildings, from say 25M to 50M the floor plate is potentially less of an issue. It's also less of an issue at lower heights, which is already reflected in midrise guidelines, but not that well, and less well in tall building guidelines. Meaning, the taller a building gets the more advantage there is the smaller floorplate and the greater separation distance; meaning if you play with tiering and setbacks, one might argue for allowing larger floor plates at lower elevations in exchange for small floor plates (or greater separation) at higher elevations.
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Likewise, the angular plane makes sense in different ways in terms of insuring good levels of main street sunlight, and reasonable setbacks that limit privacy/overlook and transition to lower rise areas.
But one can find other ways to achieve these effects. For instance, a building with a courtyard design, where any balconies face inwards, significantly reduces overlook issues, Transitioning when overlook is not a factor can be less progressive (larger, less tiered drop offs).
Sunlight access (or the impact of shadows) also varies for a host of reasons other than a new building's height. It has to do w/the direction of roads and laneways (more sun comes from the south, so a N-S roadway or laneway provides greater light access to properties fronting such streets than to E-W streets.
There are a host of variables. The challenge in allowing for handling them is the degree to which tradeoffs are subjective; and the lack of creativity that infests too much of the development industry here, every bit as much as planning.
It turns out, at least as far as I'm concerned, it's all about the outcome, not the process.
But describing the outcome in guidelines or Official Plans or Zoning By-Laws is surprisingly challenging; where dictating the process is perhaps too easy.