In every American city I know, 80%-90% of the cost of an existing home is the lot, not the house. I don't know how to overcome this, but I understand it is caused by politics, suggesting it needs a political solution. When Florida was abuilding like crazy after WWII for the next 25 years, the lot was usually about 10%.
I suspect your familiarity is with areas that are much higher cost than average. I've owned houses in two different MSAs in the top 25 in the US and the land value was much lower than 80% of the total value. Land value is also very demand-driven though local zoning regulations (multi-family units, proximity to commercial zones, etc.) do drive some of that demand.
Also, I judge the lot value by how much it would sell for without the house. The price for empty (fill-in) lots is ridiculous. I'm all for the market setting prices, but this isn't that. This is Federal interference and local building lobbying.