In 1813, Margaret Godfrey inherited a large tract of land from her husband, Louis Chaboillez.

She yielded many plots of land to the City of Montreal including the lot known as Chaboillez Square (which was larger than it is today).

The Square was completely refurbished in 1950 and reopened in 1953.

Its size was reduced in the mid-1960s in planning for the coming of the Ville Marie Expressway.

The square used to display two monuments: When the Rio Tinto Alcan Planetarium was opened near the Olympic Stadium to replace the Montreal Planetarium, both monuments were moved near the new planetarium.