Yes, it’s called property tax, calculated by multiplying a property tax rate times assessed value of the property. Does anywhere not already have that?
A property tax is typically assessed on the value of land + property, and honestly, we don't do a good job of accurately pricing the land value aspect of it. So if you don't build anything and just own the land, your property tax will be very low.
theoreticalmal's comment seems to imply that taxes on unrealized gains are not a thing, to which I was replying that property taxes are an example of a tax on unrealized gains. Everyone whose home has gone up in market value knows this because their property tax has surely increased over the years even though they haven't sold their home.
Land Value Tax (the Georgeism discussed in the article) just taxes the land on what it is worth, not the buildings on it. So holding land vacant costs more because the speculator is not making any money from it, while they could be making money from a building.
A side benefit for homeowners is that improvements increase equity and resale value without raising taxes
In CA there was/is a ban on SFH zoning. So at least in that case every homeowner should get taxed like at least a fourplex. Considering your wage didn’t increase that means less money for mortgage, etc., so buyers have less to spend on a house and your property goes down in value.