Meters, especially spot meters if you have one, will work quite well for night exposures. Find something in the scene that you want to render medium gray - a wall, pavement, etc, and meter off that. That will give you your exposure. If you can't find something you know you want to render middle gray, take a meter reading off a light source like the street lamps in Worker's photo above, and add five stops exposure.

I know this example is a color shot. Color film is a little different in that it generally doesn't require compensation for reciprocity until you hit say 30 seconds metered exposure. With black and white, you need to compensate for anything past 1 second metered exposure. The required compensation will vary from film to film, so check with the manufacturer for reciprocity charts, or look it up online. This one was shot on Fuji 800Z, and probably 1/2 second @ f2.8 if memory serves. I would have metered off the stone of the building, and then opened up to make sure the white stone rendered white.



Here's what can happen when you play around with long exposures (this was something on the order three exposures combined to a total of 1 minute 30 seconds: