You must follow these exact steps for it to work correctly!

1. The name of the mission is "The Parking Garage" and it can be played by contacting "Lester" on your phone.
2. You MUST be rank 55 to host the mission, but you can be any rank to participate.
3. You must NOT have anyone spectating the game.
4. Once you've started the mission, go to the top floor of the Parking Garage by driving a car to the 4th level.
5. When you are at top, you can crouch and hide behind a wall - do not shoot your gun!
6. You can now throw a sticky bomb or grenade at the person holding the suitcase containing the documents. You MUST destroy the documents! (This is a very important step)
7. As soon as you've done that, the mission will end and you will receive about 4500 RP (Reputation Points), $5000 and 15 JP (Job Points).
8. You can instantly restart the mission by pressing Y to like it and then pressing RT to restart it. You must NOT press A to continue. The restart button won't appear on your screen, but it will still restart the game. (This is the most important step for this method to be effective)
9. Rinse and repeat as much as you want, until it's patched of course.


Enjoy!

Edit: Also, I've went from Rank 55 to Rank 75 within less than 2-3 hours. It's the easiest method available at the moment, so rinse and repeat it while you can!

Please keep the thread alive by replying with your feedback - if you post this elsewhere, please at least give credit to Duck or myself and provide a link to Se7enSins or Thetechgame