Obviously I much prefer the old w=a (my favorite of the buildings that never got built during the last boom), but as long as that will never happen, this proposal is quite good.
I found a better picture on SOAR (or Streeterville Organization of Active Residents) Here's the link with some more info soarchicago.org/435-n-park-dr/
This area, around Ogden plaza and Cityfront Plaza really needs some infill, and this tower is nothing worth balking at.
Here is an overhead view of that area, look at all those surface parking lots:
(a screen shot from Google Maps on my iPhone)