Want to process a twilight shot in under 1 minute? I made a preset for Lightroom, and you can download the preset here. Below are the before and after shots, as well as the finished shot (with edits after applying the preset):
Finished shot, edits after preset
The preset serves as a starting point -- it gets things fairly well adjusted, and in many cases it will get you close enough to a finished shot. This particular preset is similar to my other exterior presets. For this shot, after applying the twilight preset, I cropped it better, warmed up the white balance a tad, and made a few other quick tweaks. And, since the sky was bland, I did a sky replacement as well (you can check out my tutorial for doing that here).
And that's all there is too it! Happy twilighting!