Not if you publicly announce your intentions ahead of time. Then people have no incentive to do that because the expectation will be for housing prices to decline and the investment to lose value.
> If you mean state owned properties.
I mean giving subsidies to builders who create new market rate housing. Although another major problem is zoning regulations that prevent new housing from being constructed regardless of financing.
If it was levied on the value of the land alone, there's no such thing as unreasonably punitive: land values would just drop until the tax is priced in.
If you look purely at economic efficiency, and leave out any morals about _who_ should be taxed, the only thing keeping taxes from going up all the way to taking everything is economic inefficiency. Ie if you heavily tax a particular widget, people will produce fewer widgets.
Land is fixed. You can't produce it, thus no tax can interfere with its supply. (Unless it's a tax system that incentives you to keep your land off the market, like negative gearing in Australia (https://en.wikipedia.org/wiki/Negative_gearing).)
However, if the tax was levied on the value of land plus building on it, a high tax would discourage building houses---whose supply is emphatically not fixed.
I really like this idea, except that "market value" is vague, and would require a bit of work to determine accurately. Maybe the best you could do would be to have a by-block square footage to value chart to be used for these purposes (and you would want a definitive source anyways, to prevent gaming the market value side).
This could also help quite a bit with the property owned in New York as a way to launder money[1].
1: http://www.npr.org/sections/money/2016/05/27/479717380/episo...
Ie you probably would want to tax under-occupation as well. (Otherwise you just declare a bunch of apartments as a single unit, and have a single dude check in every once in awhile. They did that in Britain, because of different legal treatment of trespassing between empty and `occupied' buildings.) But how do you define under-occupation? Where do you draw the line?
Just use a land tax. It's simpler and harder to evade.
> subsidizing construction If you mean state owned properties. I agree on that. Having low rent housing competing in the market bring prices down. But the number should be significant enough. Otherwise it just becomes a lottery where a few win but has not broader impact in the market.