I am still seeing the reservation in "My Trips"...but below was the email I got on April 1st...Legit checked flyertalk today to see if it might have been an April Fool's joke since it still is an active reservation. I booked elsewhere already as I was not offered any alternatives (lifetime Platinum, clearly didn't matter haha).

Thank you for choosing to stay at the Sheraton Tribeca. We regret to inform you that this location will be closed effective April 1, 2021. Unfortunately due to this inconvenience, your reservation at our property has been cancelled without cost. If your reservation was pre-paid you should be receiving a full refund within seven to ten business days. We apologize for any inconvenience this may cause.