After months of renovations spearheaded by the Los Angeles design firm Smith & Firestone Associates, the Waldorf Astoria properties of the Arizona Biltmore and Southern California’ La Quinta Resort & Club have debuted revamped accommodations.

First opened in 1929 in Phoenix, the renovations at the Arizona Biltmore include improvements to its guest rooms, suites, spa, salon, and 15 poolside cabanas—each cabana now has an interior lounge area equipped with a flatscreen TV and full bathtub. The renovat…