Bluebulb Projects' The Measure of Things presents:
4,500 is about two times the number of Steps in the Sears Tower
In other words, it's 2.1340 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 0.46860 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)