Bluebulb Projects' The Measure of Things presents:
8,400 is about four times the number of Steps in the Sears Tower.
In other words, it's 3.9830 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 0.25110 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)
The Sears Tower extends 108 stories into the sky above the city of Chicago and includes 2,109 steps in each of its stairwells. Each year, more than 1.3 million visitors make the trip to an observation area called the Skydeck on the 103rd floor.