The station is decorated with paintings by the artist Hamsi Boubeker.[1] On a lower floor, there is unused second station with two platforms. In the tunnel between Anneessens-Fontainas and Lemonnier, there is a tunnel towards this station.
Future
As part of the conversion of the North–South Axis of the Brussels premetro to become line 3 of the Brussels Metro, the new Toots Thielemans metro station is being built in parallel to Lemonnier and will replace the platforms currently used by lines 4 and 10. Lemonnier is the only station in the North–South Axis that will not be converted to a metro standard. Lemonnier will remain in use as an underground tram stop for several tram lines that still use the Constitution Tunnel and will also be renovated. Lemonnier will also be connected to the new Toots Thielemans station by means of a connecting corridor.[2]