The public must use the Chestnut Street entrance to the building. Go through security, where you’ll be asked to put your bags on the belt, and everything in your pockets (including wallets) into bowls. These items will be scanned, and you’ll walk through a metal detector and/or be wanded.
Go past the elevators, turn right into the waiting area, then turn left. Walk down the long hall and straight through the door with the glass surround. Turn right at the elevators and go to the 3rd floor. When the doors open, turn left and sign in at the receptionist window.