This worked for me:
- Sneak past 1st level and do not alert anyone
- Take out all the guards on the two top levels (I didn't destroy the two robot guards)
- This alerted the first floor guards but I don't think that mattered
- Talk to Koch and choose option for her to backup data
- As she walks to the terminal, grab her and knock her out
- Pick her up and take her to the roof where you should be able to extract via the AV
- Exit the hotel
- I had to cross the street before it triggered the call from Dino