30 Rock hurts the worst, and One Vanderbilt’s floor count is a matter of debate. The stairs at 30 Rock are extremely steep. Today, New York City zoning rules and the International Building Code generally cap stair height at , but the steps in the Art Deco tower, which opened to the public in 1933, measure in at 7.5. Half an inch doesn’t sound like a lot, but it feels like a lot when you’re taking them two at a time up 66 stories.