I have had a Marriott Visa card and been a member of the Marriott Rewards for years. (have actually had 5 free vacations on them). I am silver elite and have been upgraded every time I ask nicely at check-in (including Marquis on Times Square, Tampa, Salt Lake City, Quito, Ecuador, etc.). If a room on concierge level is not available, they give us access to the lounge.

suggest you ask at check-in. Enjoy! Saves breakfast $$ and the snacks in the evening (with cash bar) are lovely.