When Twitter moves into its new headquarters in downtown San Francisco this month, it will occupy three floors of an 11-story 1937 Art Deco building that has sat shuttered for five years. Outside, its blue bird logo will replace the former main tenant’s sign, whose analog clocks remain frozen at 9:18, 4:33 and other times past.
Far from Silicon Valley’s self-enclosed campuses, Twitter and other tech start-ups are gravitating to an urban core here that has defied development for decades. Its soon-to-be neighbors include liquor stores, check-cashing stores and discount hotels.
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