Thanks for the replies. I sent a message to their reservations department to see what rates they are offering for my dates.

I'm not going until January and I contacted the Four Seasons because they aren't showing availability for the first part of our stay and they have a TEN night minimum over those dates! So I think it will be either the St. Regis the whole time or a split between the St. Regis and Imanta.

I'll post back with what I hear from them re: rates.