FWIW, Chris did address this in post #22:
Originally Posted by
Marriott Concierge
The exact definition of standard may vary from hotel to hotel, but should include the vast majority of rooms at the hotel. Some exceptions would include suites, ocean view, etc.
In the case of Jensen Beach, if you go and check award bookings at this hotel you will see that Ocean View rooms require an upgrade certificate, whereas other rooms do not. One would assume from this, and Chris's comment, that anything other than an Ocean view/front room or Suite is considered a "standard" room at this hotel.