You're quite welcome. The examples I posted were not at all meant to be a solution for you, for this one particular case, but rather, a general way of thinking about such problems -- an approach based on visual analysis, not specific tools.
For example, in the image that you just posted as a goal / example, the first, huge clue is that there are no other hues than yellows and some traces of hues moving towards the red in your image, but the saturation of the gold tint does vary from point to point, becoming more saturated and more red hued in the darker tones. In addition, the contrast was carefully controlled -- probably much less than in the original, so that the sky wouldn't be blown out while preserving details in the shadows of the buildings.
These observations first tell me that whomever processed that image almost certainly desaturated it in an early step (...otherwise the natural hue variations of the actual scene would be present). He/she then adjusted the strength of the application of the gold tint between highlights, mid-tones and shadow areas and possibly use a local contrast reduction algorithm such as Topaz Adjust or Topaz detail to control contrast.
Anyway, applying the analytical approach to the considerably different image (ie, middle-of-the-day, stormy, no-man-made lights) that I used in my example, within seconds I came up with this:
[ATTACH]54084[/ATTACH]
Cheers,
Tom M
