Raising the entire thing above ground means much more building has to be supported, and that means spending more money. Plus, the supports holding up the top of the structure need to be higher up, which means more material, which means more money.
Plus, I don't think the architect has talked to a structural engineer yet. How exactly is that wok shaped bowl going to hold up the roof? And that's not to mention the massive snow loads that they would have to account for - with the flat roof like that.
I have no idea why this is being released to the public yet, its obviously just a "starting point" or an idea, totally impossible to build in its current form.
Perhaps you could build something that looked similar to what is shown, but it would likely cost over a billion dollars.
Raising the level of the floor to above grade makes handling load ins for concerts/ etc so much more difficult, as well, as you need ramps to get equipment up to the floor, all while wasting space above ground When the floor level is below grade, you can hide those support services from the public view, with a structure like this, hiding those support facilities would be impossible.
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