YOU MUST HAVE 4 STARS DRIVING AND YOU MUST USE AN AGENCY SUV! YOU DON'T NEED THE DLC.
This is done on the highest building in the game on the last kingpin Wang's building.
The text in the video below reads, "Jump to the glass using B, then when driving up the building, keep B down until you hear the suspension give way, then loose go and press B down again. It'll take some practice, but you'll nail it."
After about 45 minutes of trying to get this to work I finally got it. None of the other solutions like the truck ramp were not working for me. This was obviously my best bet. Follow what is in the video.
A few tips that I had to figure out the hard way because the video didn't include it in the text...
1: If you fall off turn on your back so that the car doesn't hit an object with the bottom middle part of the cars body. If you do hit the middle it does A LOT of damage.
2: You have to press B immediately after you hit the glass or else you will slide off.
3: Try to release and press B by using the sound. Just a little before the sound ends. If you do it by looking at the screen and not listening you will fall because you won't notice soon enough.
4: Do frontflips, I spent the majority of my time doing backflips once I tried front flips I did it in 10 minutes as opposed to the 30 I spent back flipping and not getting it.
5: Jump off RIGHT before you hit the top THEN start the frontflip. If you don't let go of B before you hit the top it'll take to long for you to start turning for the frontflip and you wont be able to get 3 flips, so you want to let go RIGHT before you hit the top; takes a lot of timing though.
6: Shortly after you get on the building there will be two chinese letters on the building, go to the left to avoid them then move to the middle once you get past them. They are they only obstacle in your way.
7: The quickest route to get to the building is this, ( if your're like me your vehicle will blow up and you will kill yourself and spawn at the agency.)
Go to agency then get an SUV.
Go through the agency tunnel marked with the number 3.
Go onto the road in front of you and a little to your right.
Keep going straight until you see the tunnel in front of you then take a left inside that tunnel.
Once out of the tunnel go right.
Go straight until you see you're first right (Not the bulding entrance.) Then take that right.
Follow that road (the road will take you left) then go into the tunnel toward your right.
Take your first right in the tunnel.
Once your out the building should be on your left.
BTW, it seems like it takes a long time from the directions but after you figure out this route it should take you 1 and a half minutes.