I used to occasionally be able to apply a 6000 point suite upgrade to my corp rate, or a BRG (which is usually described as a "Hyatt Daily Rate"). But lately it seems that Hyatt has put in place some automated process to automatically adjust the rate to the current actual Hyatt Daily Rate when a points upgrade is applied. Some agents don't even notice the rate change and won't notify you. Always check the updated reservation email after the upgrade is applied to confirm.