UNION SQUARE. A renaissance of sorts for the shopping center already located here, Westfield San Francisco Centre incorporates old and new in a 1.5 million-square-foot retail destination. The reinvigorated complex features a huge Bloomingdale's, a Nordstrom, and a nine-screen movie theater. It also shelters a host of shops offering apparel, gifts, home furnishings, books, and services. A range of sit-down and quick-serve restaurants stands poised to deal with refreshment needs of all kinds. Office space also occupies the facility, which links Union Square and SoMa.