One of my favorites for this challenge, I really love the juxtaposition of the wonderful old stone architecture and the very modern building. The colors work beautifully together, and your choice of composition works well to emphasize the tremendous difference. I am so glad that you left it color! Very nice shot!
I'd have cropped the right edge I think. Nice viewpoint and it fits the challenge nicely too. Wonder if black and white would be good for this - it might emphasise the textures more?
The old seems out of focus, and I would thinkthe foreground should be the focused area. What does the scene look like in portrait? Great subject for challenge. 6