Willis Tower / formerly Sears Tower, Chicago

Approximate model Work In Progress.

The antennas for printing are inside of the hollow base.

File: Sears2 is a pencil holder. Hollow on top.

CAD file
Designed using Onshape

v2 has hollow shells

I Reduced the height 50%. This architectural model (200x100x100mm) is not to scale but taller.  100mm high works better as a pencil holder.
100 x 100 x 100 = 8 hours. Feel free to scale your print. I scaled the antennas to be 9mm diameter and I printed the antennas at 80% infill.

Purple Micro Center PLA. I masked the base, turned it upside down and dusted the silver spray paint. I would have preferred metallic black filament but I had purple and silver paint. I like how it came out. 
A thing I am going to use daily.