Bluebulb Projects' The Measure of Things presents:
4,000 is about one-and-nine-tenths times the number of Steps in the Sears Tower.
In other words, it's 1.8970 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 0.52710 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)