Sort of the reverse of this idea:
Property owner appraises his own property, pays taxes on that valuation, but MUST accept any purchase offer at that price.
Except that, in that case, he may be forced to sell when he doesn't want to.
Sort of the reverse of that idea: People own their land outright, and don't rent it from the government, and the government reduces its scope and gets the money it needs to operate from elsewhere. (E.g. phone, gas, electricity, sewer, drainage, sales, income, and excise taxes, fees, traffic tickets ... do you suppose that could possibly be enough?)
Robert Heinlein proposed this idea in several of his novels. My main problem with it, is that if someone had a family property that they didn't want to sell. This system would force them to massively overvalue their property (and thus pay a lot more taxes than they would reasonably owe) if they wanted to keep it in the family.