Bluebulb Projects' The Measure of Things presents:
4,100 is about one-and-nine-tenths times the number of Steps in the Sears Tower.
In other words, it's 1.9440 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 0.51440 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)