A transfer will be constructed at the eastern end of the Second Avenue Subway's Harlem–125th Street station to connect to the IRT Lexington Avenue Line's 125th Street station. A new lower-level mezzanine will house the connection between the two stations, directly connecting to the downtown platform for Lexington Avenue service. The direct connection to the staircases to the upper level will be rebuilt. At the western end of the station, staircases will lead to Park Avenue, allowing passengers to walk to the Metro-North Railroad's Harlem–125th Street station.