Marriott has an award chart with each hotel assigned a category from 1 to 8. That determines the price you’ll pay in points for a standard room, as long as that room is available.
Every year Marriott re-categorizes hotels, moving them up or down, largely based on whether the rates are expected higher or lower than the previous year. There’s some wiggle room for adjustment, but changes largely track the hotel market. Here’s what’s happening March 4, 2020.