Based on Mackay's Montreal Directory for 1857-58, this is what I found: Pg 339
WARNER, G.W., Echange broker and commission merchant40 St Francois Xavier h:81 Durocher
WARNER, R.,Tobacconist147 Notre Dame WARNER, Ed.,Carter73 St Urbain
Mackay's Montreal Directory: 1858-59 Pg 417:
WARNER, HughCabinet maker30 Hermine WARNER, G.W.,Exchange broker & banker 40 St Francois Xavier house: McArthur's Bldgs, StCatherine near Stanley WARNER, R.,Tobacconist, store & residence 147 Notre Dame
As for SCANLANs: In 1857-58 there were 6 listed
1858-59: 8 Scanlan families listed.
I believe if Wm Henry Warner was born in 1858, on St Urbain Street, the family resided in either the St Lawrence Ward or St Jean Baptiste wards.Were he born in a hospital, at that time, it may have been HOTEL DIEU or Hopital Jeanne d'Arc. There hospitals were/are located on St Urbain street. In those days, however, many babies were born at home.