These include the St. Regis New york city (set amid the cultural center that is Midtown Manhattan), the St. Regis Aspen (an ultra-luxurious mountain retreat situated steps from Aspen's best ski slopes), and The Phoenician Houses (a haven for relaxation amidst the natural splendor of Arizona's Camelback Mountain). Ownership is for 4 weeks each year. Pick fixed weeks to take a trip over the same period every year, or select "floating" weeks that give you the liberty to travel during various…