Great shot Marcel, I like the exposure as is.
The warm low light shows the building off how it should, and the sky is perfect.
I agree with the crop, I would take some of from the sides as the bits of building in the shadows don't really add anything to the image.
I would also go for the pano crop, placing the bottom of the building on the lower third.
I'm not one for converting to black and white, unless the subject suits the format, and I don't think B&W does this justice.