(1) Aggressive solution: Going through the offices Deus Ex: HR Guide
Last update: 11 May 2016
Start off by exploring the room where you've watched the recording to find an Ebook. Proceed towards the only available exit to find yourself standing in a corridor with a lot of laser traps (screen above). There are two ways how you can act here. If you want to surprise enemy units later on, then you should try moving between laser beams without crossing them. If you don't mind raising an alarm right now, then you can cross one of the beams.
If you intentionally raised an alarm, then you should quickly take cover behind one of the nearby walls. Wait for enemy units to show up (screen above) and start shooting at them. It's important to watch out for a heavily armored soldier during this battle, because he'll be tough to kill and he'll be using a very powerful weapon.
If you've decided to avoid the lasers you will be allowed to enter the northern office undetected. Take some time to find a good cover (screen above) and then attack enemy soldiers, using the element or surprise.
It doesn't matter how the battle started, because aside from the human guards you'll also have to deal with a new robot. The easiest way to get rid of the machine is to use heavy firepower, mines or EMP grenades #1, however you could also try reprogramming the robot. This method requires getting inside the eastern office. There's an electronic lock on the door to this room #2, but you can input a 2967 security code.
Once you're inside the office you'll have to quickly interact with a computer terminal #1 and input a pangutym password. Log in and then choose to shut down or reprogram the robot (Robot Domination augmentation required) #2.
Make sure that it's safe to move and try getting closer to the northern exit from the main office (screen above).
The northern corridor is probably patrolled by several enemies, including an elite soldier named Kahn. You can either remain in the main office and wait for enemies to show up #1, go north and engage them in an open combat #2 or wait for the reprogrammed robot to do all the dirty work for you.
Make sure that Kahn is dead before moving on, because otherwise he would be a very serious threat. Consider examining bodies of all fallen enemies, finding ammunition and a valuable EMP grenade. It's also a good idea to explore the eastern security room #1, because there's a weapon locker inside. Head north once you're done here #2.
Important! The walkthrough is continued in Step 2 (Reaching the elevator).