The Platinum Triangle is a district of Anaheim, California, United States, that is undergoing transformation from a low-density commercial and industrial zone into a more urban environment with high-density housing, commercial office towers, and retail space. The 820 acres area undergoing this large-scale redevelopment includes the city's two major sports ve…The Platinum Triangle is a district of Anaheim, California, United States, that is undergoing transformation from a low-density commercial and industrial zone into a more urban environment with high-density housing, commercial office towers, and retail space. The 820 acres area undergoing this large-scale redevelopment includes the city's two major sports venues, the Honda Center and Angel Stadium of Anaheim.