What is worth more?
The average house in the country with a couple of acres of land or a 700square foot condo in Manhattan.
Generally the presence of other people tend to push up property values as it brings in a lot more amenities.
I'm not saying it's a majority, but I think a lot of suburb-dwellers would rather live in one or either of the country or the city, but are stuck in the 'burbs for the public schools.
Yes, the economic value and desirability are exactly the same. You just seem to discount the location of the condo as not being part of the value the condo is providing. But it is in fact the most important part of the value.
That's not it.
If you have a hundred acres of land and a hundred families and you require every house to be built on an acre of land, housing will be pretty expensive, because even the poor will have to pay the price for a full acre, when you might otherwise have mix of half acre lots, two acre lots, etc.
If you have a hundred acres of land and two hundred families and you require every house to be built on an acre of land, housing will be really expensive, because building enough for everyone is prohibited by law. And relaxing the zoning to allow higher density will lower housing prices because the supply of housing increases.
That's not because people don't want to live there anymore, it's just because you don't have to outbid your neighbors in a fight over the artificially scarce housing anymore because if you get more people you can build more housing.
And there's nothing about allowing higher densities that prohibits you from paying for the lower density housing -- it just doesn't prohibit someone else from doing otherwise. Which actually makes lower density housing more affordable, because you can buy it without having to outbid people who would choose higher density housing given the option.
this is why rent is so cheap in manhattan, san fransisco, london, etc