Though at presstime the Palacio Duhau-Park Hyatt Buenos Aires had barely opened, we must nonetheless hail it as a major new addition to the city's hotel scene. Just down the street from the Alvear Palace, this converted 1934 mansion—which re-mained in the hands of the Duhau family until only a few years ago—is the last building of its kind, harking back to an aristocratic city that has long since given way to the 21st century. General mana-ger Christophe Lorvo says that many genteel porteños can recall attending cotillions in the palacio during the fifties. Now the hotel is set to usher in another era altogether—that of the chic international traveler. From $410 to $4,500. At 1661 Avda. Alvear; 54-11/5171-1234; buenosaires.park.hyatt.com.