Bluebulb Projects' The Measure of Things presents:
8,100 is about four times the number of Steps in the Sears Tower.
In other words, it's 3.8410 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 0.26030 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)