The First Financial Center of Illswich

This building was inspired by the Fourth Financial Center in Wichita Kansas.
The actual building was designed by the Chicago firm of Skidmore Owings and Merril. The head architect was Bruce Graham. It was built in 1974.
The Lego building is a smaller scale version. It retains the center atrium that uses fully half of the whole structure, but in the interest of plausibility, I reduced mine to have of the original buildings size.
My building is not yet furnished to speed the render process. The actual building featured an Alexander Calder mobile in the atrium. I would like to replicate this soon.
As per the rules, this creation follows all the proper building guidelines. All parts are known to exist, and were available in the colors stipulated. (good luck finding all those white castle corners!)