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Do you mean you went to the warehouse mentioned in your link, or are they just all over the area? I couldn't get a clear sense of that from the link, other than that they move around and adapt.
I did love this:
Subsequently those businesses started employing methods to keep the crows away, which the crows soon adapted to.
“What they’ve realized is the disturbance maybe works for a bit…until the crows get habituated to it and then they totally ignore it.” -George Clulow, former BCFO president
Oliver Schick-
They're all over, covering an area about 300 metres across, as far as I can tell. When they first arrive they're quite active and very very noisy - it's easy to get the sense that they're greeting each other and talking about their day. Then as it gets properly dark they settle down, and it's much quieter, but really eerie when you look up and realise that every tree is completely full of crows.
bootbonnet
We visited the crow roost in Burnaby last night. It's amazing - and intimidating - to see and hear thousands of them gathering from all across the city as the daylight fades.