By my count each side of the hexagon is 16 windows.

Quotes are from the wikipedia article on the building:

One World Trade Center's top floor is officially designated as floor 104...”

By my count (red dots) the hexagonal floor is about the 38th or 37th floor down from the top. Out of 104 floors that would make it the 67th or 68th floor... however:

...despite the fact that the tower only contains 94 actual stories.”

In that case, 94 minus 37 or 38 = the 57th or 56th floor...

So who are the tenents on these floors?

68:MDC Partners

67: “

57:Moody’s Investors Service

56: “

Maybe not so interesting, but then again, I could easily be incorrect in my count of floors. Especially since one window per floor may not be the case, and also I may be miscounting, furthering the error. Wikipedia goes on to say:

The building has 86 usable above-ground floors, of which 78 are intended for office purposes. The base consists of floors 1–19, including a 65-foot-high (20 m) public lobby... The office floors begin at floor 20, and go up to floor 63. There is a sky lobby on floor 64; office floors resume on floor 65, and stop at floor 90. Floors 91–99 and 103–104 are mechanical floors...”

The tower has a three-story observation deck, located on floors 100–102... the actual viewing space is on the 100th floor, but there is a food court on the 101st floor and a space for events for the 102nd floor."

The tower's window-washing tracks are located on a 16-square-foot area, which is designated as floor 110 as a symbolic reference to the 110 floors of the original tower."

So I have to admit I’m not certain what number floor this is, without seeing the plans or going there. Maybe someone can help figure this one out? I think it’s intriguing, but maybe it’s nothing (yeah, right!)

I will note that, if I am in error somewhat and off by a floor, one floor below Moody’s is the General Services Administration which has an interesting seal, and another couple of floors down is both GSA and FEMA.