The artificial intelligence startup Sierra is set to sign its third office lease in San Francisco in as many years. The firm, headed by OpenAI Chair Bret Taylor, plans to take 300K SF at 185 Berry St. The two-building complex, known as China Basin, is also home to Lyft’s headquarters.  
The deal is expected to close imminently, according to the San Francisco Business Times, which reported the potential lease on Monday, citing anonymous sources.