Apple has announced that its first retail store in San Francisco will open in Union Square at One Stockton Street on Saturday, February 28 at 10:00 a.m. PST. The store will be one of the company’s five flagship stores worldwide, joining the stores in New York, Chicago, Los Angeles and Tokyo. A special preview of the store will be held for the media on Thursday, February 26 at 10:00 a.m. PST.