Bluebulb Projects' The Measure of Things presents:
150,000,000 is about 70,000 times the number of Steps in the Sears Tower.
In other words, it's 71,120 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 0.000014060 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)