Was this a sold out hotel situation for the day of your checkout? Or a wedding/private event/conference happening next day?
Literally any hotel in the world will allow late checkout with no issues (regardless of status), as long as they aren't expecting the next block of guests to arrive on a sold-out day etc. It doesn't have much to do with status/brand etc (all of them have "subject to availability" stuff written in to get out of it if they need to kick you out).