Confronting Sarif

Chapter 12 - Peeling Back the Curtain Jensen returned to Detroit, intending to confront Sarif and track down Eliza's second lead. But tensions between normal and augmented humans had reached a flashpoint: riots had erupted in several cities, and the U.N was being urged to intervene. Sarif admitted that the scientists were taken by the Illuminati, probably because of research they'd been conducting. Then He urged Jensen to get his people back, handing him a ticket to a Humanity Front convention...

M1 - Confronting Sarif is a mission in Deus Ex: Human Revolution.

Meet Sarif in my apartment
Now that you're back from your overseas adventures, it's time to get back to work in Detroit. First up, talking to Sarif. The conversation with Eliza raised a lot of questions and Sarif needs to answer them.

If you have the Punch Through Wall augmentation you can go to the back corner of the helipad to find a hidden room with a credit chip.

Continue into the building and take the elevator down to meet with Sarif. He will give you instructions on your first real mission back in the city: Finding Isaias Sandoval