100% tax on the value of land is the policy proposal. It makes economic sense, would let us abolish regressive taxes on labor and sales, would incentivize more abundant housing. Seriously. This is the solution.
So the importantly, you would only pay tax on the value of the land your property is on, not the entirely of the property. Essentially, society owns the land and "rents" it to anybody who wants to use it for housing or a business, and that "rent" would belong to society, either as UBI or as funding for services.
So if your house is in a really rural area, the land isn't worth that much, your LVT would likely be quite low. If your house is in a high demand area, like manhattan, the LVT is high, and you should probably build and apartment or something so lots of people can live there. If the land you want to use has a lot of valuable resources under it, it would be expensive, and you have to pay a lot for the right to use it. This is essentially what Norway and Alaska to get as much money as possible out of oil companies and give it to citizens.
I merely explained you the view of those you are talking with, I'm not well versed on the topic.
Luckily, the answer to your question is once again easy to derive from what the other people are saying: the price would drop to a reasonable price if houses got stripped of their role as a form of investment.
Or rather, as it's often the case in this day and age, if the selfish return of a profit was weighted against the damage to the community and found not to be desirable.
The solution is to just define that the price is low, okay. So are there still incentives to upgrade, maintain etc. a property when the value is low anyway? Is the money you spend on something thrown out of the window as soon as it is installed on the house? What about great locations, how to value those? So all the things that already apply to the housing market, how do you want to circumvent all of these factors that go into the value of a property/house?
You keep thinking I'm the heral of this position...
I guess there's two solution, the pragmatical approach is that people aware of the issue increase the offer on the market. The market is still a market so all you are saying still applies but it sees a rise in offer.
The other, more idealistic but also, ideal, is government intervention so basically you get to set upo the rules any way it make sense non the principle of putting a roof above everybody.
All this aside, do you fix or upgrade the place you live in simply so that you can sell it at a higher price? I do this stuff because... That's where I live?