After getting a phone call from Clara head to the waypoint in The Loop. Check the alley area for any crafting materials before you proceed to the access point. The access point is blocked by two ctOS boxes in the area, indicated by the two white lines exiting the box. You will need to deactivate both before you can proceed.
The first box is located in the same area as the access point, on an upper level. Turn around from the access point and look up to hack a camera that will allow you access to the first box. The second box is located further down the alley to the east. Drop down and head east to a scissor lift and look up to hack another camera, with the second box directly across the building. With both boxes now unlocked, return to the access point to hack into the apartment.
The meet-up was a trap and you will find yourself ambushed by Fixers. If you activated the blockers you will slow down the men on foot, but there are still snipers in the buildings and more coming from the east alley.
Cunning Route - Explosive Action
Rather than pulling out your gun, take cover behind the railing or Protector by the box and use the cameras to get an eye on the snipers. Both snipers have stupidly stood directly next to junction boxes that can be exploded to take them out. This will give you the height advantage over the rest of the marksmen. You can then pull out your gun and take out the final marksmen as they enter the alley or make their way up the stairs .
Escape Route - Flee the Scene
Instead of dealing with the enemies it is possible to escape the area by exiting into the parking garage stairway. If you plan on doing this, jump down the way you climbed up the first time toward the blue sign with the P on it. From here you can pick up a car and flee, but you will need to lose the men on the streets instead of getting the experience for killing them in the alley.
After escaping or killing all the Fixers, head east to the waypoint at the Forever Sculpture to complete the mission.