It is frequently pointed out by Georgists that there are no really good rebuttals to land value taxation.
This excerpt from a 1971 letter to my grandfather from a colleague describes where the opposition comes from:
There may be be no "arguments that actually oppose LVT" as Bill says, but there are plenty of people who not only actually but actively oppose it. These are the people who are making hundreds of millions of dollars a year on the unearned increments land speculation gets as a result of land being so undertaxed that the landowner puts up only a trifling share of the enormous community investment needed to make his land reachable, livable and readily saleable. Of 7 million-odd New Yorkers I would guess that perhaps 70,000 people profit by today's misapplication of the property tax while 7 million lose by it, but the problem is that the 7 million have no idea of what they are losing while the 70,000 jolly well know that they have a good thing going for them and fight to keep it.
I've been trying for a year to get my friend, J___ C___, past president of the Realtors and Chairman of the Realtors Economic Research Committee to stop fighting LVT, but he keeps coming back to how his father bought some land near San Diego for $20 an acre before 1900 and sold it for $4,000 an acre around 1950 and his father could not have held it all that time if he had had to pay more than a nominal tax.
I don't think anyone should take the equity argument seriously. Just because the ownership of underused land has been subsidized for years does not entitle its owners to expect the subsidy to be continued forever, and likewise, for those who bought land in the expectation that the subsidy would be permanent. The equity objection to increasing the tax on land would apply almost equally to any other tax increase.
A week later, another letter includes this:
Just because landowners have had a wonderful subsidy racket going for them in the past should not give them any claim on having that subsidy continue ad infinitum. I do agree with Lowell that the transition to LVT would raise problems, and in any area with a high tax rat on property I can see that the transition would have to be staggered over a period of years, probably not less than five or more than ten, dpending on how big a tax rate was to be shifted off improvement values onto location values.
In the same file, a copy of a 1969 letter from the same person to Lowell (Harriss):
I don't see how tripling the tax on land could fail to force almost all owners of underused land to get busy and put it to better use. Conversely, I don't see how taking the equivalent of a 51% sales tax off improvements could fail to be a tremendous stimulant to improvements. If a 7% Federal tax credit on improvements was so effective, what would wiping out a 50% tax do!