the mezzanine was closed off and converted to crew rooms. The other entrance/exit is at the station's extreme north end and is unstaffed. An up-only escalator and long staircase from each platform goes up to a mezzanine above the tracks. Two pairs of exit-only turnstiles and one set of four turnstiles provide entrance/exit from the system. This entrance has two street stairs: one to Fleet Street on the east side, outside Long Island University Brooklyn, and the other to the former Albee Square on the west side, outside the City Point development. Both fare control areas feature a 2005 artwork called DeKalb Improvisation by Stephen Johnson. It consists of a large mural in the main fare control area and several smaller ones in the secondary one. Track layout North of the station, the outer and bypass tracks head towards the Manhattan Bridge to Manhattan with a flying junction, where express trains can use either the north side of the bridge via the Chrystie Street Connection to the IND Sixth Avenue Line or the south side of the bridge to the BMT Broadway Line. Trains traveling through this interlocking are frequently delayed, since Brighton and Fourth Avenue trains have to cross over each other to use both the Broadway and Sixth Avenue Lines. Local trains continue on the middle tracks north along the BMT Fourth Avenue Line into the Montague Street Tunnel towards the BMT Broadway Line or the BMT Nassau Street Line, the latter of which is unused in revenue service. South of the station, the bypass tracks become the express tracks on the Fourth Avenue Line. The four remaining tracks become six tracks at a flying junction. Trains headed south on the tunnel local tracks or outer tracks proceed to the BMT Brighton Line or switch from those two tracks and provide the route to the Fourth Avenue Line local tracks. In the current service pattern, the tunnel route is not used for Brighton Line trains. The station has a shortened mezzanine because room was needed for a proposed Lafayette Avenue line. The subway connection was never built. North of this station, near the Manhattan Bridge, there is a provision for a never-built loop back to southern Brooklyn without crossing the Manhattan Bridge into Manhattan. Bellmouths for the unbuilt loop are visible from passing trains. South of this station, a junction was built at Fulton Street for a never-built