[9][10] The IRT was authorized to extend its Brooklyn line (now the Eastern Parkway Line) under Flatbush Avenue, with a four-track route paralleling the BRT's subway southeast of the existing Atlantic Avenue station.

[19] The platforms are superimposed above the IRT Eastern Parkway Line's express tracks, which run on a lower level.

Mosaic name tablets reading "7TH AVENUE" in white seriffed lettering on a blue background and gold and brown border appear below the trim lines.

Gamboge I-beam columns run along both platforms, alternating ones having the standard black station name plate with white lettering.

One stair goes up to the south sidewalk of Park Place east of Flatbush Avenue, while the other stair goes to the south sidewalk of Flatbush Avenue southeast of Park Place.