The 23rd Street station on the IRT Lexington Avenue Line opened on July 1, 1919, with four tracks and two side platforms. Original tile friezes and name tablets are along some portions of the platforms; platform extensions are tiled in standard white subway tile with no decoration. There are no crossunders or crossovers, and no evidence of former ones. Tile floor is at the token booth only. The station platform is gray painted concrete.
The mosaic sign features whimsical takes on the numbers "2" and "3," almost as if the tile maker was having too much fun and didn't want to stop.