Yeah, that glass tower would be nice, as would the WTC Utah. But, if those ideas never come to pass, here's my idea of what should go on 200 South and State Street where Carl's Jr is.
It's a condo tower (looking north at the building), with ground-level retail and built-in parking. It also has some parking underground, but you can't see that.
And the Carl's Jr never really left the spot in my drawing, it just moved slightly.