Elon Musk. Photo: Hannibal Hanschke/Reuters Images Europe/Pool/dpa ISTANBUL, July 30 (Bernama-Anadolu) -- The unauthorised installation of a giant X sign on the roof of Elon Musk's Twitter headquarters is being challenged by San Francisco building inspectors, Anadolu Agency (AA) quoted the San Francisco Chronicle. According to Patrick Hannan, building inspector spokesman, permission from the California city's planning commission and a building permit are both required in order to ensure the sign's structural integrity and safe installation.

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