When Jake asks Olivia about Russell being tortured next door, he says she and her neighbor share a wall, which is how he figured it out. However, when they show the other apartment where Russell is being held, the wall to the right of the door, which should be the one that is shared with Olivia's apartment, has windows all along the length of it. Based on the physical layout of the neighbor's apartment compared with Olivia's apartment, there is no way for them to share a wall.