I am looking for a bar in old montreal

Back in the 70's and 80's Place Ville-Marie was a bumpin place, full of life. There was a bar there, called the Marquis De Sade. I have since left montreal and i can't remeber for the life of me where it is.
Does anyone know where this bar is? or if it has been renamed or anything? My son just turned legal age and i want to take him there for some bonding time.
Your help would be much appreciated : ) thank you