Started with the PRICELINE link and 60$, was offered to rebid for 77$. Instead I kept adding zones (luckily only three of the Seattle zones do have 4* properties :) ) and bid $62, $64, $65, $67, $68, $69. The last of these offers was accepted. So $69 seems to be the current Westin minimum (see also this winning priceline bid). Actually, the Westin was what I wanted, so I am quite happy :)