This is just a beautiful picture to look at. I love the choice of B+W. At first I was going to suggest more contrast, but the gray really works for the overcast feeling I associate with this city.
I'd like to see the shot from the ride. That would be a good point of view. The contrast of the B&W, however, is good so you do see the structures clearly against the sky.
Good contrast both in the b&w and in the 2 contrasting structures. I don't think a little USM would go amiis tho, as the shot seems a bit on the soft side. Still, very nice, 9