The perspective is great...the horizon is centered and everything works. If you wanted to play around with this photo a little I'd darken the lighter sections of this picture. Espcially the background. It'd give more perspective to how deep the street actually goes. The B&W treatment really works on this picture...strong shadows.
Nice. I especially like the upper part of the photo. I've actually had thoughts of doing something like this when I was down in D.C., but I never followed though. Great idea, nicely done!