Your ancestor lived in the Montreal parish in 1872? Maybe in Hochelaga, Côte de la Visitation, Côte St. Louis, Côte St. Jean Baptiste or Côte-des-Neiges? Would you like to know if he owned his home or not?
Then, you might be interested by this book I found on the Web.
Extract of the official book of reference of the parish of Montreal : including the incorporated villages of Hochelaga, la Côte de la Visitation, la Côte St. Louis, St. Jean-Baptiste, and la Côte des Neiges / prepared and published by L.W. Sicotte (1872)
It indicates for each lot the name of the owner and the dimensions in the villages mentioned above. The number before each name is the official lot number. If you download the PDF version, you may easily do a search in the document.
When compared to the 1871 Canadian Census, this book might be very useful.
I found the names of Honoré Tourville, who lived in the village of St-Henri as well as Élisabeth Lamoureux, widow of Louis Tourville, her son Médard as well as two of her sons-in-law, Denis Barrette and Napoléon Gauvreau who lived in St-Jean-Baptiste village.