Be sure you adjust the exposure of your rendering in the Tone Mapping settings. It is critical!
It will depend on several factors, so start with the screenshot shown above and after testing with a rendering, adjust as you think may be needed - ok, V2's environment dialog is
slightly different from the screenshot, but I think you can figure it out with a little effort.
Keep in mind that night shots are rare in photography of architecture, more common are Twilight shots - where the sun has just set, but the sky is still bright and colorful.
As written in step-by-step above:
Set your Sun in SketchUp where you would like to have the Moon shining.
Set your Sun and Sky Parameters as shown here.
Sun Color = 255,237,193
Sun Radius (Sunlight Slider) = 10 (use arrow keys on your keyboard for fine tuning)
Maximum Sun Intensity = 0.8 ("sun strength" in V2)
Sky Brightness = .2
Sky Turbidity = 3