Thief Side Mission: The Point Of No Return

This is one of the areas hidden by debris. Look for a small opening near the ground, and crotch through. There is a merchant just to your left, if you'd like to stock up or sell anything. On the left side of the stairs is an electrical box, Cut the wire to gain access to the building.

Behind the painting is a button. Expect to be shot when you push it. Garrett even makes a joke about it after you pick up the items that you came for. The body by the painting has an item, and two more pieces are reveled behind you to your left after you push the button.