(4) Peaceful solution: Leaving the penthouse Deus Ex: HR Guide
Last update: 11 May 2016
Map legend: 1 - Entrance to the shaft; 2 - Exit from the shaft.
The easiest way to deal with enemy units in the penthouse is to avoid them by using camouflage (Cloaking System augmentation). You would have to travel north in order to get to the corridor (screen above) leading to the elevators. If you want to choose this method, then don't forget to make at least one stop along the way to regenerate the batteries. An ideal place for that "pit-stop" would be a ventilation shaft described below.
If you don't have camouflage, then sadly you will have to consider eliminating at least some of the soldiers from the penthouse. Remain on the upper balcony and wait for one of the guards to show up #1. Stun him quietly and then deal with two other soldiers stationed near the stairs leading to Zhao's office #2. Be careful, because your actions can't be seen by other people.
The next guard is patrolling the stairs leading to the largest northern room of the penthouse (the one with a lot of exhibits). Take cover somewhere nearby (screen above), wait for him to show up and quietly get rid of him.
That was the easy part and now for the hard part. Defeating all of the remaining soldiers from the northern hall will be very difficult. If you don't mind taking some risks you can throw a gas grenade at them (screen above) and then make a run for it. This is possible only if you have an Implanted Rebreather augmentation, because otherwise you would also fall victim to deadly gas. Alternatively you could start using a tranquilizer rifle on the soldiers, however remaining hidden and keeping them uncapacitated would be a serious challenge.
If you want to take the soldiers from the main hall by surprise, then it would be a good idea to use a ventilation shaft. The entrance to the shaft is located in the north-eastern corner of Zhao's office #1. Use a ladder along the way and it shouldn't take long to get to the exit from the vents #2. Start eliminating enemy soldiers from here or use camouflage to quickly leave this area. Be careful, because things might get more complicated if enemies with heavy rifles will locate you.
All the methods described above will allow you to leave main areas of the penthouse and to get to northern corridors. Ignore the elevator you've used to get here, because you'll have to go further to the north to find a second elevator (screen above). Listen to a conversation with Malik along the way to learn that you'll have to open a hangar door to ensure your escape.
Important! The walkthrough is continued in Step 5 (Opening the hangar door).
Reward: 2500 experience points + 750 experience points for staying undetected.