As the video below shows there are some train tracks in McClane. Start a pursuit and then use the ramps on street level to jump up. Driving east the tracks will end in a ledge right above one of the repair/gas stations. Stand right on the edge of that ledge so the cops can see you. Simply rise your wanted status to the levels you need then turn around and drive out of sight to end the pursuit.
You'll be completely safe up here since the cops will not follow you up the ramps. On level 4 (if I'm not mistaken) you'll face some SUVs coming over the bridge across the ledge you'll hold out on. They will hit a ramp and jump towards you. They'll land next to you on said ledge but will wreck their cars in the process so you don't have to worry here.
Videocredits to cakechieveables on Youtube.