Really?

There were rumors that it would be in Baie D’Urfe, which is on the southwest tip of the island, fairly far from downtown Montreal. Here's a job posting for "data center security" which seems to be located out there: https://www.amazon.jobs/en/jobs/452269

There are multiple sites, and if it's anything like other regions, then one at most would be downtown

You can read about what constitutes a region in the AWS documentation, and it's not one building downtown.

Full disclosure: I work there.