On first map at top with North being to the right the large BLACK DOT near words Broadway looks to me to be the comfort station. The F.A. is a circle colored purple looks to be to be the same comfort station in nexy 2 maps. Note the bathroom/comfort station east of the museum is same color.
The building in question in the first map on the East side of street has an S with a line denoting south I believe. I would assume it is the train station and the “not open yet” is the overpass connection uptown and downtown that perhaps was not open yet for use. Or they used an older map and did not update it.
The photo looks to be dated 1925. Would help to know the dates of the 3 maps as they look to be different years and perhaps makers hence the confusion.