The fact that the menu at Ostra in Back Bay has a section dedicated to caviar should give you a hint as to what type of place this is. You’re not going to get out of here without your wallet losing a little weight, but if you have a corporate card at your disposal or a Brewster’s Millions situation going on, you can enjoy a high-end Mediterranean seafood meal at this white tablecloth spot near Park Square. Start with the king crab risotto.