Ritz-Carlton Club owners can play golf in Jupiter, Fla., ski in Aspen and Bachelor Gulch, Colo., or lounge on the beach in St. Thomas. In the coming years, members in search of an American city experience will have an option on either coast. Ritz-Carlton is transforming a landmark building in San Francisco into a hotel, which, when it opens in November 2007, will include 49 fractional units (priced from $200,000 for three weeks). In 2009, the historic Seville Hotel in Miami’s South Beach will become part of a development that will house 45 fractional residences. Both locations will offer 21-day deeded shares, and if owners grow tired of the cities, they can trade their time and retreat to the mountains or beach.