With the construction of the Blue Line in 1986, the station was greatly expanded. Two large volumes were dug, one on either side of the original station, giving access to the stacked Blue Line platforms below. This portion of the station was designed by Gilbert Sauvé, and included artistic tiling designs by the architect as well as a large mural by Judith Bricault. Another access was built leading to the Plaza Saint-Hubert, connecting to the eastern volume by an automated entrance. The Blue Line platforms were inaugurated on June 16, 1986.