This was reported back on 7/1/2014. Yes these circles are for the medallions.When I saw those circles I too thought of the medallions ...not so much as putting them there but gave an historic nod to them. I do like the idea of incorporating them though.I wonder if the medallions from the Star Tribune building are going to find a home in those circles. And agreed: this limestone or stone-like material is a vast improvement on the City Center-like precast concrete on the building's opposite side.
http://m.startribune.com/business/265471801.html