Bluebulb Projects' The Measure of Things presents:
12,000 is about five-and-a-half times the number of Steps in the Sears Tower
In other words, it's 5.690 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 0.17570 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)