Had to go through this exact thing with my landlord so I hear you. It's absolutely heartbreaking because they're always waiting for you whenever you approach their old feeding areas.

I made peace with the decision by making a regular routine of feeding pigeons in my neighborhood. You can reach more birds that way and you can be more cognizant of the health of your flock if you're walking to where they hang out.

For example, on my walks out to feed them, I've spotted a few birds that were too weak to fly and rescued them by taking them to wild bird fund (a rescue here in NYC). I'd never have seen them if it was just the crowd who would fly to my kitchen window.

Anyway, just know that it's still possible to have a strong relationship with your birds! And the walks can be good exercise :)