Very nice shot overall, however there are a couple of things in it that bug me. But instead of heading right into those I think it'd be better to analyse the whole process of viewing this image.

The initial view of this photo delivers quite an impact, the perspective and sense of the looming unknown (which the B&W adds to, good decision on that). This of course is from the foreground, being the starting point. There are a couple of minor issues here, nothing quite so devastating, but they're still there. The one I noticed first was that it is slightly off center, the left side forms a sharper than that of the right. The feeling you're trying to convey, one of the unknown, is often linked with perfect symmetry. Obviously you know that, as you tried to do that here, but it didn't come out quite right. I know it would be quite difficult to spot this slight offset on the LCD of your camera, but recognizing a situation where a subtle shift can actually alter the view of the shot is no where near as difficult, so taking measures to avoid it is fairly easy (IE: Take a bunch of pictures to assure you got it right). Another thing is the highlights on the metal on the sides, they're just a tad too bright. That's really easy to fix though so I'll just leave it at that. Also you might want to consider cloning out the warning stickers on the sides, as they identify it as a more familiar sight in our minds.

You probably noticed that, while I praised the initial impact, I marked the overall impact rather low. This is because what happens after the foreground. The lines draw ones eyes to the background, and this (the background) is where I find fault in your photo. It's entirely too cluttered, serving as a major distraction. I know there's little you can do about that, as it's just how the building is, however you can try to minimize the effect. One thing in particular of that clutter is the structure located right at the top of the moving sidewalk. What I would suggest is to take the photo from a lower angle (almost close to touching the ground) which would obviously impose the sidewalk further in the photo, which would add to the dominating feel of the photograph.

Critique courtesy of *devCRIT