To accommodate the increased patronage expected after the beginning of Second Avenue Subway service, the MTA built four new entrances at the intersection of Third Avenue and 63rd Street, leading to a new mezzanine at the eastern end of the station. Passengers travel between the new mezzanine and the platforms using four high-speed elevators, similar to the layout of several other stations deep underground. These elevators are the most space-efficient means of transporting people. These entrances opened on December 30, 2016. The MTA inaugurated Phase 1 of Second Avenue Subway service on January 1, 2017.