REWARDS - Valet Parking job unlocks
This is another mission for Officer Tenpenny. Head to the yellow blip on the radar. The hotel operates a valet parking service. You have to follow the valet, marked with a red arrow, into the parking garage. Once the valet parks the car and gets out, quickly kill him without being seen by anyone. Getting any stars during this mission will blow your cover and you'll fail the mission. Once you kill the valet, take his clothes and head back outside.
The DA drives a blue Merit and you'll have to identify it when he pulls it in to be parked (one of the valets points out the car when it approaches). You also have to make sure that no other valets get to the car before you (if one does, simply pull him out of the car).
Once you get into the DA's car, you'll have around 4 minutes to drive it to your garage to have the drugs planted, then back to the parking garage and park it. You have to quickly move and you MUST NOT DAMAGE THE CAR. When you get it back to the parking lot, park in the designated spot and get out of the car. Go outside, into the red marker and CJ will automatically call the police to bust the DA.