Hyatt Regency Montreal has valet parking with in and out fir C$25 per day or you can self park in the complexe desjardin (shopping center) parking for $19 overnight weekdays and $8 evenings after 5pm (till 4am), Saturday, Sunday - single entry only.

One bonus is that if you purchase $25 before taxes or eat in restaurants in the shopping center for that amount before tax, go to the customer service desk on the 3rd floor and they will give you a validated parking that could reduce your parking by $8. I parked Friday 5pm till Sat. 12 noon and gave a validated ticket expecting to pay $8 for the 2nd day but was waved through with $0.00 showing.