80th Street, which opened on September 25, 1915, was one of the eight stations along Liberty Avenue in Brooklyn and Queens built for the
BMT Fulton Street Line. The first two, Crescent Street and
Grant Avenue in Brooklyn, were the last two stations on the line from 1894 to 1915. In 1915, the
BMT, under their portion of the
Dual Contracts, added the current three-track elevated structure along the Queens section of Liberty Avenue, which is now the only remnant of the line. It ran the previous terminus at Grant Avenue to the present
Ozone Park–Lefferts Boulevard station, adding six new stations overall. The connection from this station west (railroad north) to the BMT el was severed on April 26, 1956. To replace that service, the underground IND line was extended east (railroad south) from its previous terminus at
Euclid Avenue via a new connecting tunnel and ramp. An intermediate station, also called
Grant Avenue, was built along this tunnel, right before the point where the track was then elevated to connect to the remaining sections of the BMT el. This service began on April 29, 1956. The station was completely renovated in 2014. The project, which was part of a $39 million program to renovate five stations from 80th Street to
111th Street, involved closing each platform for several months at a time. ==Station layout==