“For nearly all of US history, American property taxes have taken a pretty standard form. Individuals pay a tax based on the assessed value of their land, buildings, and any other improvements to their property combined. If you renovate your house and make it nicer, for example, your overall property tax could go up. The proposed land-value tax in Detroit, by contrast, would effectively tax land at a higher rate than any buildings or amenities on the property.
Mayor Duggan, who is spearheading the effort, hopes this land-value tax idea will incentivize development on blighted property as well as offer some tax relief to homeowners, who bear some of the highest rates in the country. The Duggan administration estimates that under his proposal 97 percent of Detroit homeowners will see an average decrease of 17 percent in property tax. The proposal is not about lowering taxes generally, but about increasing taxes on those who own vacant land (a big problem in the city) and decreasing future taxes on people who develop their land.
“I think it is an important idea for any place where people are holding onto valuable land that could be used for more productive purposes,” James Hohman, the director of fiscal policy at the Mackinac Center for Public Policy in Michigan, told Vox.”
https://www.vox.com/24025379/detroit-land-value-tax-lvt-property-tax-housing-vacant-blight