История станции 77-й улицы: от расширения платформ до облицовки плиткой.

New York City Subway station in Brooklyn
the station actually at East 77th Street and Lexington Avenue in Manhattan
As part of negotiations between New York City and the Brooklyn Rapid Transit Company (BRT), and the Interborough Rapid Transit Company for the expansion of the city's transit network, the line was leased to a subsidiary of the BRT. The agreement, known as Contract 4 of the Dual Contracts, was signed on March 19, 1913.

On June 27, 1922, the New York State Transit Commission commissioned its engineers to examine platform lengthening plans for 23 stations on the lines of the Brooklyn–Manhattan Transit Corporation (BMT), the successor to the BRT, to accommodate eight car trains. As part of the project, 77th Street's platforms would have been lengthened from to Progress on the extensions did not occur until February 16, 1925, when the New York City Board of Transportation (NYCBOT) commissioned its engineers to examine platform lengthening plans for this and eleven other stations along the Fourth Avenue Line. It estimated the project would cost $633,000 (633000.0 in 1925 is equivalent to about <calculated amount> in recent years). The BMT had been ordered by the Transit Commission to lengthen these platforms since September 1923. The NYCBOT received bids for the project on February 25, 1926. The contract was awarded to the Corson Construction Company for $345,021 (345021.0 in 1926 is equivalent to about <calculated amount> in recent years). The extensions opened on August 1, 1927.

The city government took over the BMT's operations on June 1, 1940. In the 1960s, the New York City Transit Authority (NYCTA) started a project to lengthen station platforms on its lines in Southern Brooklyn to to accommodate 10 car trains. On July 14, 1967, the NYCTA awarded a contract to conduct test borings at eleven stations on the Fourth Avenue Line, including 77th Street, to the W. M. Walsh Corporation for $6,585 in preparation of the construction of platform extensions (6585.0 in 1967 is equivalent to about <calculated amount> in recent years). The NYCTA issued an invitation for bids on the project to extend the platforms at stations along the Fourth Avenue Line between 45th Street station and Bay Ridge–95th Street, including this station, on May 3, 1968. However, work had already started on the platform extension project in February. As part of the renovation project, the station's platforms were extended at its northern and southern ends, for a total of , and the station's elaborate mosaic tile walls were covered over with white cinderblock tiles. The latter change, which was also made to 15 other stations on the BMT Broadway and Fourth Avenue Line, was criticized for being dehumanizing. The NYCTA spokesman stated that the old tiles were in poor condition and that the change was made to improve the appearance of stations and provide uniformity. Furthermore, it did not consider the old mosaics to have "any great artistic merit". In 2017, as part of an initiative to increase the accessibility of the New York City Subway system, the MTA indicated that it was considering installing elevators at the 77th Street and 95th Street stations.

The Fourth Avenue Line south of 59th Street, including the Bay Ridge Avenue and 77th Street stations, was built as a two track structure under the west side of Fourth Avenue with plans for two future tracks on the east side of the street. The station is designed to allow the northbound platform to become the Manhattan bound express trackway if the two additional tracks were built. To facilitate the conversion, the northbound platform is mostly columnless and is wider than the southbound platform. Furthermore, there is space underneath the platform for the trackway.

The station's full time entrance is a mezzanine at the south end above the platforms and tracks. Two staircases from each platform go up to a waiting area/crossover, where a turnstile bank provides entrance/exit from the system. Outside fare control, there is a token booth and two staircases going up to either northern corners of 77th Street and Fourth Avenue. The northwest staircase has its original ornate banisters and railings. Inside the mezzanine, there are mosaics indicating a newsstand and two restrooms, all of which are now closed, and directing to each platform. In addition, the Bay Ridge bound platform has an exit only at the north end, which consisted of one high entry exit turnstile on the platform. A single platform level exit only turnstiles leads to a double flight staircase that goes up to the northwest corner of 76th Street and Fourth Avenue.