Sometimes it's better to beg for forgiveness than ask for permission

In my experience using corporate rates (which I have been legitimately entitled to use), a select few properties have some verbiage in the Hyatt.com search results screen saying something along the lines of "this is a highly negotiated rate that is tied to volume and is not authorized for personal use". So I've avoided using the rates at those properties (and the rates were *very* attractive) but the others have been fair game .