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Interrogate neighbors and identify the caller
The first part of this quest is optional. You can talk to people in apartments: 008, 006, 005, 003, 002, 009 and 016 - all on the ground floor.
Your main objective is to go back to the guard room. Walk around, when you find closed door use hacking.
While in his room, check guard's computer. The 1st floor file. It shows your next objective - Helena Nowak's apartment.
Once on the first floor go to apartment 106. Your task has changed. Go to apartment 104 on the same floor.