UPSCALE EXPANSION: Desert Hills Premium Outlets in Cabazon, Calif., on Thursday unveiled a $100 million expansion that brought 50 new stores, new landscaping, wider walkways and a 1,100-space parking garage to the center. The property, which now boasts 650,000 square feet of retail space, is one of the largest outlet malls in the country. The new stores include Alexander McQueen, Bally, Belstaff, CH Carolina Herrera, Fendi, Helmut Lang, Valentino, John Varvatos, Max Mara, Rag and Bone, Maje, Sandro and Wolford. Simon’s Premium Outlet division said first-day sales exceeded expectations. Executives said some shoppers boarded cross-country flights to get to the bargains.