Bluebulb Projects' The Measure of Things presents:
1,500 is about seven-tenths the number of Steps in the Sears Tower.
In other words, it's 0.71120 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 1.4060 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)