https://apnews.com/article/twitter-san-francisco-building-x-elon-musk-4e0ae2a3b1b838b744bb2dc494f5b23c

SAN FRANCISCO (AP) — The city of San Francisco has opened a complaint and launched an investigation into a giant “X” sign that was installed Friday on top of the downtown building formerly known as Twitter headquarters as owner Elon Musk continues his rebrand of the social media platform.

City officials say replacing letters or symbols on buildings, or erecting a sign on top of one, requires a permit for design and safety reasons.