I first saw it reported in SFGate, they've since retracted the story:
Editor's note: SFGATE has removed this story after reviewing Zynga's company valuation.
The initial report was based on the enterprise value of Zynga compared to its cash reserves and property value. The latest company financial data as of May 6th, 2016, however, indicates an overall market valuation of $2.2 billion, with cash reserves of $987 million, putting its enterprise value at $1.21 billion, which is significantly more than the projected value of the company's real estate holdings at 8th and Townsend Streets in San Francisco.