Directly east of the control area at the south end of the BMT Broadway Line mezzanine, a corridor slopes down to the IRT mezzanine. The IRT mezzanine contains two overpasses, connecting the station complex with exits on the east side of both Fourth Avenue and Union Square East. Galleries extend from the overpasses above the platforms, with stairs leading downward from the galleries to each island platform. A corridor runs above the western side of the IRT station, connecting the two overpasses. This corridor contains restored cross-segments of the original station wall, including faience cornices, mosaic tile borders, and plaques of eagles. These are part of a larger, station-wide art installation entitled "Framing Union Square", by Mary Miss. Original faience plaques with the number "14" are in the southern end of the mezzanine, near one of the entrances. Other decorations, such as a pale blue frieze, date from later renovations. The area near the Zeckendorf Towers contains storefronts, as well as steel and glass enclosures.