> It would seem that the land value of both parcels should be the same.
Yes, the land value is the same. lets say the Land value is $1 million each and the skyscraper is worth $1 million. Lets say property taxes are 1% under the current system:
0.01 * 2,000,000 = $20,000/year for skyscraper plot
0.01 * 1,000,000 = $10,000/year for vacant plot
There's a total of $30,000 per year in income so we have to equalize our LVT to match. a 1.5% LVT gives us:
0.015 * 1,000,000 = $15,000/year for skyscraper plot
0.015 * 1,000,000 = $15,000/year for vacant plot
The owner will evaluate building a skyscraper against investing in some other venture unrelated to the land. Under Property Tax, investing that $1 million into his property adds a -1% to his projected yearly returns that isn't present for other investments that $1 million is competing for. That discourages development even if the skyscraper would have been profitable.