Originally Posted by Marriott Concierge

Corporate rates that are set up for individual properties, (not Marriott wide rates) are created generally by contacting the property and speaking with the Director of Reservations, or the General Manager at select service properties. They should be able to tell you what your rate code is. Of course there are some rates that can only be booked by the property, in which case knowing the code would not help you book your corporate rate.

Ira