State and local officials announced Friday that Chinese hybrid electric automaker BYD Co. will open its U.S. headquarters in downtown Los Angeles. China’s fourth-largest automaker expects to create at least 150 jobs here by 2011 as it rolls out its fleet of vehicles to California markets first before expanding throughout the country. “By bringing global alternative energy companies to Los Angeles, we are securing our future and building the foundation for an emerging industry that will attract good paying, green collar jobs for generations of Angelenos,” said Mayor Antonio R. Villaraigosa during a City Hall press conference that included Gov....