Doesn't appear to be any substantial commentary or explanation provided online, but they closed back around February 2020. Perhaps with the perception of uncertainty with the upcoming pandemic at that time:

 
AFAIK Chartwell just terminated the lease. It was very weird because the pandemic as we now know it hadn't yet started and most everyone in the area loved the place.
 
I heard that a lot of the residents in the building complained about the patio / noise
Well, for a retirement building, maybe a Denny's makes more sense?

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