It\'s a bit confusing, but all you can do is run, but make sure you don\'t leave him behind. As soon as you go up the first set of stairs, you are on the right level. Don\'t go up any more sets of stairs. Just run around trying to avoid gun shots from the police.
That\'s about all I can say.
Oh, and have a car parked as closely to the exit of the building as possible.......preferably a fast but durable one. As soon as you are out and in the car, make your way to the Pay \'n Spray shop, or try to find some police bribe icons.