Canada

Proudboy Milhouse is correct in saying that the people who making the zoning bylaws are a hurdle to overcome when it comes to nice, walkable, affordable cities. The other obvious hurdle is brought up by the mayors, the cost. "Can I do it (permission)?" and "Can I do it (ability)?"

The $107,000 in infrastructure costs that the CMHC mentions is for single family houses, and is so high because the suburb model is so incredibly inefficient. Build things far away from jobs, shopping, errands, and entertainment. Also build them with large yards so they are even farther apart. Now build new roads, and electrical grid, and plumbing.
Now maintain all of that with lower land taxes per KM because it's all residential. Upkeep is brutal.
This is draining city bank accounts.

Our current government is a little more right-leaning for my tastes, but "I would like you to do a thing, so I will give you money as long as you do the thing and also do it in the way I would like." is a much better way to achieve a goal than "Do this expensive thing I want or else I will take away your transit"