The front building looks a little soft on focus. Other than that I like the composition of the shot and I like how you've filled the background with the new building. It's great.
I do like the use of contrasts here but the photographic contrast needs to be a bit stronger. Depending on what color the foreground tower is, it might also work in selective desat, with the background building left in B&W.
I really like the juxtapostion of lines and curves, but It hink this would have been better if everything were in sharper focus. The whole picture looks a little soft. I'd also like crisper contrast. (Hard to please, aren't I???)