[Update: We have more on the history of this building, which was the Natatorium Building before it became a theater.]
This once-splendid movie house on Forbes Avenue was designed by Harry S. Bair, a specialist in neighborhood movie palaces who also designed the Regent in East Liberty. According to comments on Cinematreasures.org, it was built with the screen at the street end: you had to walk up a long hall to come in at the rear of the theater. Thus it took advantage of the hillside location to make a naturally sloped auditorium. The building ceased to be a theater about four decades ago; it is now retail stores and apartments.
The picture above is a composite of four photographs.