To get a free Lassiteer V16 roadster, go into free ride mode and choose City-Small and any car. Drive around in the "working quarters" until you find a two story car park garage next to a building with a sign that reads "Lost Heaven Hardware Co.". Drive up the ramp to the second level. In the corner, there should be a large green car, the Lassiteer V16 roadster. It will be unlocked.