This observatory is included in the montreal city pass.
Not a long wait, and not many people, so was a nice ride up to the 46th floor looking down at the city of montreal through glass windows on all sides of the building. They have information of the landmarks at each corner.
They also had plugs and benches to charge our phones if needed to.
The doors and walls are all painted with the same design so it's easy to miss the elevator on the first floor or bathrooms on the 46th floor.
There are two friendly people walking in the 46th floor if you need assistance.
It would be more awesome if they were open at night also. They close at 5pm, so we could only view the city in daylight.