Two for One
Head to the marked location. You have to find and profile the two targets first. One of the targets is on the rooftop beside some vent pipes. The other one is air boxing with a lone guard in the rooftop garden nearby. You can reach it easily by using the lift beside the street. Just be careful of the guard. There's also a sniper on the ledge in front of the target. The sniper can also call in reinforcements. Hack the nearby cameras and create diversions needed to allow you to move in and take them out one by one. Remember, the targets needs to be taken down non-lethally. The guards can be taken out of the equation. Avoid alerting them since the targets will most likely join the Combat.
The sniper can be taken out by bursting the valve in one corner of the ledge. Wait for him to get near then burst it to kill him. There are also some other guards who carry explosives with them that you can remotely trigger. If you have a silenced weapon, you can also take them out covertly.
No Parking
Head to the parking lot. The enemies are found on the second floor. Use the cameras to tag them and use the environment to distract the enemies or kill them. After clearing the floor, head to the next floor and use the cameras to tag the targets and scout the area. Take note that the target will attempt to escape if ever an enemy detects you so move slowly and silently. Use the camera as well to profile the target and mark him.
Street Cleaning
Head to the restricted area and use the cameras to tag enemies and profile the target. Once done, you can pretty much do whatever approach you want. Just remember, stealthy takedowns and executions are very effective in making sure you get the job done without alerting the target. Prioritize taking out the sniper in the ledge since he can also call in reinforcements. Once his guards are out, you can go down and beat him down.