Anders - Nothing is ever straight. First there is the B&W Adj. Layer, then a Path around the horizon and the structures to separate the sky to treat that on its own. The main tower in front was a little wonky compared to the rest so floated that to a new layer and corrected it then a lot of little dabs here and there with adjustment layers, lighting and darkening, a very soft vignette darkening the outside edges and corners, a final curve on top of it all for a bit of pop and lastly, a selectively applied low amount, high radius USM (amt 20, radius 85, threshold 0) mostly applied to everything below the horizon for a final bit of midtone contrast enhancement.