In 1973, a tunnel was dug under the Des Quatre-Bourgeois Street. This name refers to the four large estates with opulent villas through which the road passed in the 19th century. These were the Villa Champlain (built in 1849 by Samuel King), Hazel Grove Cottage (built in 1850 by Joseph Auld), New Prospect (built in 1850 by William Blanchard Valleau) and Mapple Cottage (built in 1856 by James Gillepsie).