Come with us, as we attempt to explain the legend of the 13th floor, and introduce you to Denver’s most horrifying haunted experience, the 13th Floor. The levels of a multi story building are frequently numbered sequentially, from "basement", “lobby”, “ground”, "one", or “1” upwards or occasionally downwards. In some countries, as it is here in the United States, the number 13 is considered unlucky and building owners will sometimes purposefully omit a floor numbered 13.

Even building owners who are not themselves superstitious realize that the desirability of units on the 13th floor might be compromised because of superstitious tenants, or commercial tenants who worry about losing superstitious customers.

Based on an internal review of records, the Otis Elevators company estimates that 85% of the buildings with their elevators do not have a named 13th floor.

Why are skeptics so easily convinced that the majority would just rather avoid the 13th floor? What has happened in history to create such a stigma about a 13th floor? For whatever reasons there may be, there seems to be a multitude of stories about what happens on the 13th floor, some documented, some not. It seems that it has become largely accepted to just leave this mystery alone, brush it under the rug, and don’t talk about it.

A good example is that some have suggested the 13th floor in government buildings is not really missing, but actually contains top-secret governmental departments, or more generally that it is proof of something sinister or clandestine going on.

It should be noted that to place a floor between those accessible from an elevator, it is necessary to either take longer to travel between the neighboring floors, or accelerate, both of which would be noticed by the riders. It would also be noticeable from the exterior, requiring either an extra row of windows or a conspicuous gap between rows.

Thus, it would make much more sense to build a secret floor, such as the 13th floor as a basement, making it much easier to hide 13th floor's location in what appear to be single story buildings, underground.