A levy on low density property (with a focus on properties in designated metrolinx transit nodes) would encourage high density . However would likely be politically unpalatable. The bridle path crew would see it as an attack on their wealth and the blue collar "Condos everywhere ugh!!!" crowd would see it as a an attack on small town low density communities driven by politicians who are funded by greedy developers.I don’t know how much this would raise, but the city of Toronto should levy an escalated property tax rate on properties over a certain threshold of square footage or value. The mega-rich can afford to contribute more to fix the quagmire the city’s finances are still in.