depends on the styling, what do you want from the set/location?
you can drive all the way down the extension of bourke street docklands, and shoot under the bolte bridge if you want a mix of industrial/fencing/city/water/sunset. very versatile location.
upper roof car park of south melbourne market may provide some city backgrounds.
elwood beach car park has a post missing, so you can park a car on the bluestone boardwalk
dandenongs if you want tall gum trees, and a motion blur around the bends
if you want very busy graffiti, try around flinders lane, hossier lane...