I love the light and the softness of the sky contrasted again the hard and prickly building. The image has a very nice abstract quality about it, a pleasing composition. I also like the fact you chose to go B & W with this...it emphasizes the light...the contrast between the hard surfaces against the softness of the clouds...well done.
Interesting shot. I would have liked more detail instead of a silhouette. There is too much mass with this building so overall it is a little too dark for my taste.