Perhaps someone who has thought about this more can explain how a 'land value tax' differs from existing property tax regimes that explicitly examine the value of improvements and the value of land... This Detroit case is interesting because there are different rates of taxation on the land, but the difference in rate could also be obtained by increasing the land component of a parcel's value.
Land value tax is an idea by Henry George - the guy who coined the phrase "the rent is too damn high". His idea is among other things that a property tax discourages investment - one way to make money as an investor is to hold a plot of empty land in a desirable city centre location, watch it go up in value, and neither pay tax on any development on it nor bother with messy things such as tenants. Taxing the land val…
E.g. where I live it's just assumed that all your assets produce a yield of 4% yearly, and that is taxed as regular income. Makes the tax declaration also a lot easier, since people don't have to list all exact dividends and profits they might have gotten from investments.