I am not so sure that the Oritani Theatre wasn't built at the time of the photo. Look at the Fox theatre in the photo. The stage or screen area was at the western part of the building. When theatres of that era were constructed, the stage area was always built higher than the seating area since stage sets were raised and lowered from hoists above the stage area. Looking again at the photo you can see the seating area under an arched roof where the patrons were facing the westerly direction toward the stage.
Now, lets walk across the street to the Oritani Theatre site. At the Oritani Theatre, the stage was at the south end of the building behind the stores on East Camden Street and the building extended north from the stage so that the patrons were seated looking south. The entrance was on Main St. perpendicular to the seating.
Although it is difficult to see the building in it's true perspective, you can see a high stage area adjacent to East Camden Street with what looks like two ducts on the roof. Looking closely, you can make out the seating area so that the patrons would have been looking south towards the stage.
It is hard to see the Oritani; but, if you know what you are looking for, you can see the theatre.