Southern California’s luxury shopping landscape is shrinking as three high-end department store locations prepare to shut their doors. Two Saks Fifth Avenue stores in the region are slated to close , including locations at South Coast Plaza in Costa Mesa and The Gardens on El Paseo in Palm Desert. A Neiman Marcus store at Westfield Topanga in Canoga Park will also close, removing another luxury anchor from one of the San Fernando Valley’s busiest shopping centers. The shutdowns are part of a