Enjoy a three-night stay at this 4-star property that occupies a 26-story tower within a self-contained city of four granite buildings linked by walkways, two blocks northeast of the convention center.  The fourth-floor recreational complex is home to a heated indoor pool and a whirlpool sits outside on the terrace. A rooftop tennis court and jogging track combine with the fitness center to keep guests' blood racing. A shopping pavilion and valet parking top out the offerings. The soundproofed guest rooms, at close to 400 square feet, are larger than the Denver norm. They are appointed with electronic locks, wingback chairs and other fine traditional pieces, thermostats, TVs, three phones with data ports, coffeemakers, irons and ironing boards, walk-in closets and marble combination baths with stall showers.  The dedicated staff is knowledgeable, obliging and competent on all levels.