Bluebulb Projects' The Measure of Things presents:
1,000 is about half the number of Steps in the Sears Tower.
In other words, it's 0.4742 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 2.109 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)