The City Hall station is a bi-level station, with an unused two-island platform, three-track lower level reachable from a single staircase from about the center of the in-use upper platform. The staircase leads to the western platform; the eastern platform was never finished and does not have a usable stairway. The middle track in the lower level station was to be used for short turns from either direction depending on the service pattern, with a layout much like that at Whitehall Street–South Ferry station further south.