Due to repeated breakdowns of the elevators, further replacements took place in 2000 and between 2021 and 2022, requiring the full closure of the Clark Street station.

[14] Booth & Flinn Ltd. and the O'Rourke Engineering Construction Company received a $6.47 million contract in July 1914 to build a tunnel between Old Slip in Manhattan and Clark Street in Brooklyn.

[22] The tube was largely finished by March,[23] and the IRT decided to push forward the tunnel's opening after learning that BRT workers might go on strike.

[38] The New York City Transit Authority (NYCTA) announced plans in 1956 to add fluorescent lights above the edges of the station's platforms,[39] which were installed the next year.

[42] During the 1964–1965 fiscal year, the platforms at Clark Street, along with those at four other stations on the Broadway–Seventh Avenue Line, were lengthened to 525 feet (160 m) to accommodate a ten-car train of 51-foot (16 m) IRT cars.

[47] Developer Martin J. Raynes began converting part of the Hotel St. George, above the station, to an apartment building in 1978.

[48] As part of the project, mayor Ed Koch announced that the developer had agreed to renovate the hotel's subway entrance.

[49][50] On January 3, 1980, work began on a $225,000 project to renovate the arcade entrance to the station through the St. George Hotel.

[55] The $260,000 cost was roughly evenly split between public and private agencies,[55] with $120,000 coming from St. George Tower Developers.

[58] A further renovation during the mid-1980s involved refinishing the platform, installing new lights and new signs, repainting the station, and adding artwork.

At the time, the project was only 25 percent complete; tiles on the floors and walls had been removed, and part of the passageway connecting the platform to the elevators had been closed off, causing severe congestion during rush hours.

[62] The renovation was also delayed because of poor communication: in one case, contractors installed a public-address system on a beam that was intended to contain new lighting.

[67][72] Newsday, in 1992, reported that one of the station's elevators had recorded 24 outages in six months and was non-functional for nearly a quarter of that time.

[74] That January, the MTA announced that it would close the Clark Street station for four months to repair the elevators, which dated from 1962.

[74][75] Although many merchants and residents opposed a full shutdown,[76] the MTA estimated that it would be able to accelerate the work by closing the station completely.

[75] The station closed temporarily in April 2000;[77] although the storefronts near the fare-control area remained open, their operators reported steep declines in business.

[88] The MTA estimated that repairs might take eight months to three years depending on whether the station is fully closed or remains open.

[87][89][90] In September 2021, the MTA announced that the station would be closed for several months for elevator replacement and structural repairs.

[94][95] In spite of the renovation, local news website The City found that the elevators broke down dozens of times from May to December 2022, trapping passengers on several occasions.

[96] In 2024, the MTA announced that it would install low platform fences at the Clark Street station to reduce the likelihood of passengers falling onto the tracks.

[103] On the walls adjacent to the tracks are mosaics of sailing ships and docks, a reference to the maritime activity of New York Harbor.

[109] The artwork consists of red circles, yellow triangles, and gray-white squares in various configurations, placed on a background of black tiles.

[87] Three elevators ascend from the lower-mezzanine passageway to a fare control area[108][110] on the ground floor of the Hotel St.

[115][116]: 42–44  The exit would have consisted of a tunnel connection measuring 1,135 feet (346 m) from the east side of Furman Street to the center of the existing mezzanine passageway.

Construction of this passageway would have required expensive major structural support for the Brooklyn Queens Expressway cantilever overhead.