The drama section of the SAGA yearbooks often has a picture of someone backstage operating the stage’s switch board. Although the panel was apparently removed during the 1950s remodel, the panel is noted on the building plans on the right. The plan on the left notes that there were peep holes through which the operator could view the two stages.
The switch board would have been on the wall with the electrical panel in the bottom photo, and the peep hole would have been in the panel to the right of the door in the top left photo. From the plans, it is clear that my office wasn’t really a broom closet as I had thought. It (and the parallel office by the Ishmael Room) was actually part of the stage that was partitioned off when the theater was closed.