<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by spstx:
I know that Marriott guarantees lounge access for Gold and Plat, but will they upgrade Silver when availability exist?</font>
In my experience it is very common. Of course it is within the discretion of the hotel. When you make your reservation, request a complimentary upgrade to the Concierge level. Renew your request when you check in to the hotel. Rooms on the Concierge floor may not be available, but they will often offer you access to the lounge instead.