How can you value something that people can’t afford or don’t want?
HOW much is any piece of property worth? Whatever somebody else will pay for it would seem like a reasonable answer. Remember that phrase that “you can’t buck the market”.
The market sets the right price between buyer and seller. Although there are other factors that come into play the point is that free trade between roughly equal parties should allow for the setting of a reasonable valuation or establish a fair worth on a property.