Re building: It's the olympic tower next to the old cycling stadium (that's now the Biodome). The tower is really sheared like that. And kind of ugly.
Re pie: ["what's that over there?" (quick grab)] works quite well. ;-)
The olympic stadium is where the Expos played until they decamped; I don't know what use it has now. They have an uber-fancy retractible roof that never quite works right, and the tower is visible for miles. I don't find it ugly, per se -- it's just a particularly striking part of the background. Too bad they charge so much to go to the top -- where the view is no worse than the view from the mountain.
I've never heard of firemen rappling off the observatory -- was there a small cat in distress?