So we're just going to ignore the city's lack of willingness to rezone areas of the suburbs?
Look at downtown:
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People can build there because the current zoning bylaws allow for it.
Even in old Toronto, they have zoned the major transportation corridors for High-Density Commercial/Residential.
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But Sheppard Avenue?
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How about Spadina Line Subway stations?
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It's worth noting that yellow areas generally correlate to height restrictions of 10m (3 stories) on Spadina and Sheppard, but 12-16m downtown.
Frontage limits also heavily influence the density of the surroundings.
People want to live where it's affordable and safe. I'd live closer to my work along the Spadina subway if rent wasn't 2.5K a month up there. It's not like downtown is the most expensive place in the city