I saw another article regarding this building, but can't find the link now. Intriguingly it would be a marvel to see, but essentially it looks like someone has done a cheap Photoshop of 432 Park Ave and bent it to make the curve.
And as a side, to be a pedant, shouldn't this be a "n" shaped building rather than "u" as per the article?
Just by common sense, people should realize this isn't a serious proposal. It is just something some bored/unemployed architecture student thought up in 15 minutes for shits and giggles. I don't understand why this dumb rendering is getting so much press.