Noah Berger/AP
- Elon Musk had a huge X logo put on the roof of its San Francisco headquarters on Friday.
- City officials are investigating if he had the necessary permits to do so.
- It comes after Musk ordered the Twitter sign to be removed from the building on Monday.
Elon Musk had a huge "X" logo put on the roof of its headquarters in San Francisco Friday as part of his overhaul of the company formerly known as Twitter.
City officials are now investigating whether it had the necessary permission to install the logo, per The Associated Press.