Art of not getting Found

Some robbers are really skillful, they plan an exit after an heist... Thats not you. After pulling a huge heist you are stuck on top of a building your only way out is to walk through each floor and get to elevator which can only go one floor down. Problem: Lights are off and you can only see footage of some cameras... good thing the security guard is out. There are some automated camera though which will call 911 automatically if you are visible for more than 5 seconds...