Ok, I am a newb as well. However all I shoot is architecture and man made stuff pretty much. I have never found people terribly interesting. So take everything with a grain of salt
First off good photo, I would have been snapping the building too.
C&C, Here is what I see in it.
1) The noise which has been covered and is a pretty easy fix.
2) The bottom half of the building, I am guess it was left out due to the unsightly mess of urban clutter. Not much you can do about that, however the way it was cropped with the side of the building being sliced along an angle is a bit (IMHO) distracting. I often try to create a false bottom, basically a slice along one of the floors so (my brain at least) doesn't immediately recognize there is a lot missing.
3) Play with the angle at which you are shooting the building, this image looks to be at about 45 degrees. Personally I like mine at about 20 degrees or so, it will cut off the side but allows the entire front to be in the photo.
4) Given the rather cool color tones you have going on in there, I would be tempted to try it for an HDR or play with some of the levels.
That's my advice, it's worth what you paid for it.