Hunter/Hunted

First, travel to the C.I.T ruins then tune in to the Courser signal. Next, you have to head east towards Greenetech Genetics. The building is filled with Gunners and you'll have to fight your way up as you track down the courser.

From the lobby, go upstairs then head to the second area. There are some turrets here but you can turn them off using the unlocked terminal in the NW corner of the ground floor. Continue upstairs to the third floor and enter the room to the right. There's an issue of the Massachusetts Surgical Journal on the small table between red couches.

Continue along the corridor then go up the ramp to the next floor. There's another turret control terminal before the doorway leading to the bridge. Cross the bridge to find a chem station. In the Novice-locked room across the kitchen, you'll find crafting components, frag mines, and a rigged explosives crate. Disarm the trigger and the makeshift bomb to salvage more crafting components.

Continue forth and go up the ramp to the next floor. More enemies are waiting here so clear the floor. The room in the NE corner has a stealth boy and missile on the table. Make your way to the bridge on this floor and you'll find yet another turret control terminal that you can hack.

Cross the bridge then fight your way through the next hallway. Go out in the terrace then continue upstairs from there. The next floor's hallway has collapsed so disarm the laser trap on the next set of stairs then continue up.

In the next floor, go down the ramp to find another explosives crate then enter the next room. Kill the gunner then disarm the laser tripwire to collect the crafting materials. Prepare for an ambush then open the next door. Several Gunners are waiting for you by the stairs. Take them out and check out this room's smaller utility/storage rooms to find more crafting materials. Once ready, ride the elevator in the middle.

After leaving the elevator, you can get two fusion cores from the security gate ahead locked by a Master terminal. Open the normal door ahead to find the stairs. There's an Advanced door to your immediate right just beside that doorway. Alternatively, you can open it by hacking the Advanced terminal beside it. There's another fusion core inside this room.

Continue upstairs and hack the novice terminal to the left of the large door to open it. There's another novice terminal to the right but it will only open the smaller security door leading to an ammo box and first aid kit.

Continue upstairs to find the courser interrogating the remaining Gunners. He's quite sturdy and will utilize stealth so make sure to target him manually and use explosives to deal extra damage. Once the courser's defeated, loot the Courser Chip and his outfit.

There's also a trapped synth, K1-98 behind the Master-locked security door. Talk to her and she'll tell you about the password kept inside the red toolbox under the stairs. Grab the password and use it on the terminal to Power on the elevator and open the security door. You'll get no reward from freeing this synth so you can leave the are through the rooftop door using the stairs or the ground exit using the elevator.