This works best with exterior or cut-away views of interiors, not so well for interiors where the camera is fully surrounded. Makes soft shadows and renders much more quickly than with interior lights.
(Adapted from HOK BIM Solutions )
Make a new sun setting with the time set to 2:30 AM or so.
Set the Exposure Value on the Rendering to somewhere between 2 and 2.5
Render with Exterior: Sun Only and a white background (or sky if you prefer)