Something about the sky is not helping you. With so much of the picture being featureless black, it needs a little more punch. You've blown out the lower part of the sky, as well. Maybe darkening the scene as a whole or upping the contrast? That being said, the silhouette itself is striking and growing on me the more I look at it.
Overall, a bit flat for b/w. Clouds are too burned out for my taste, still you've met the challenge by creating a silhouette with the building against the cloudy sky. 5 from me.
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