During the flooding in Thailand, I was in and out of the capitol city three times and never saw anything unusual besides everything being really quiet. When I was there last time ten days ago, the city was already back to business as usual. None of the Starwood properties were affected.
Starwood has now launched a Thailand sale that will last until the end of January for stays from January 4th until 31st of March. The rates offered are up to 50% off the Best Available Rate.
These are the rates listed as up to 50% off the Best Available Rate. Sheraton Grande Sukhumvit came at the offered price for weekends in January. For the dates I checked, the lowest rate I could find for the Le Meridien Bangkok was 3300 THB. The sale rate for the St Regis Bangkok was about 1000 THB lower than the 6900 THB rate listed.
It probably make sense to use the regular rate search that will show the discounted Unbeatable Thailand rates as well as all the other ones