Harbourfront condos in GTA! Why cheaper?

I don't live in Toronto yet hence asking. Gonna move in March.

Why are Harbourfront condos in GTA cheaper(not cheap of course) than other in core downtown and surrounding neighborhoods? You know the ones on the other side of Gardiner.

I checked a few apartments on marketplace and kijiji and they are partial lake view, all amenities, pretty close to transit, also seemed bigger than the matchboxes in Downtown.

I can always see a 1 bedroom under 2500, some even 2200. In any big city, anything close to water begins to increase exponentially even when there are no amenities.

What am I missing here? What's the catch?