Ahhh yes, that was always a mystery when I was at Carroll. But I do recall, FCB had some pretty expansive plans for a “campus” once North Hills was finished, and this building was supposed to be torn down. It called for a building to go in the parking lot behind the ugly circular building, but I forget the height.
Someone else may have a better memory.
I like the circular building! Has a somewhat calm English vibe to I find pleasant.
It’s also easier to defend against invaders, with views in all directions.
those dang corporate raiders!! 
especially the part where it’s encircled by surface lot parking and a drive-thru. 
A Parking Moat if you will 
Literally… Google Maps
They need to fill that with water and crocodiles.
Sounds like that might almost qualify as a fountain. 
It’s been empty for nearly a decade, the bank is waiting for the best opportunity to sell the property but might redevelop the land if they need to expand. I doubt the latter will happen.
I’m sure Kane would love to gobble up that property to expand his NH empire, once he builds out the innovation district.