• Home
  • News
  • Fortune 500
  • Tech
  • Finance
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
Tech

San Francisco is investigating the giant ‘X’ installed on the building formerly known as Twitter’s headquarters

By
Janie Har
Janie Har
,
Haven Daley
Haven Daley
and
The Associated Press
The Associated Press
Down Arrow Button Icon
By
Janie Har
Janie Har
,
Haven Daley
Haven Daley
and
The Associated Press
The Associated Press
Down Arrow Button Icon
July 29, 2023, 11:44 AM ET
Twitter 'X'
Workers install lighting on an "X" sign atop the downtown San Francisco building that housed what was formally known as Twitter, now rebranded X by owner Elon Musk, Friday, July 28, 2023. AP Photo/Noah Berger

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.

Recommended Video

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.

The X appeared after San Francisco police stopped workers on Monday from removing the brand’s iconic bird and logo from the side of the building, saying they hadn’t taped off the sidewalk to keep pedestrians safe if anything fell.

Any replacement letters or symbols would require a permit to ensure “consistency with the historic nature of the building” and to make sure additions are safely attached to the sign, Patrick Hannan, spokesperson for the Department of Building Inspection said earlier this week.

Erecting a sign on top of a building also requires a permit, Hannan said Friday.

“Planning review and approval is also necessary for the installation of this sign. The city is opening a complaint and initiating an investigation,” he said in an email.

Musk unveiled a new “X” logo to replace Twitter’s famous blue bird as he remakes the social media platform he bought for $44 billion last year. The X started appearing at the top of the desktop version of Twitter on Monday.

Musk, who is also CEO of Tesla, has long been fascinated with the letter X and had already renamed Twitter’s corporate name to X Corp. after he bought it in October. One of his children is called “X.” The child’s actual name is a collection of letters and symbols.

On Friday afternoon, a worker on a lift machine made adjustments to the sign and then left.

Join us at the Fortune Workplace Innovation Summit May 19–20, 2026, in Atlanta. The next era of workplace innovation is here—and the old playbook is being rewritten. At this exclusive, high-energy event, the world’s most innovative leaders will convene to explore how AI, humanity, and strategy converge to redefine, again, the future of work. Register now.
About the Authors
By Janie Har
See full bioRight Arrow Button Icon
By Haven Daley
See full bioRight Arrow Button Icon
By The Associated Press
See full bioRight Arrow Button Icon

Latest in Tech

AIpalantir
New contract shows Palantir is working on a tech platform for another federal agency that works with ICE
By Jessica MathewsDecember 9, 2025
17 minutes ago
Databricks CEO speaking on stage.
AIBrainstorm AI
Databricks CEO Ali Ghodsi says his company will be worth $1 trillion by doing these three things
By Beatrice NolanDecember 9, 2025
46 minutes ago
AIBrainstorm AI
CoreWeave CEO: Despite see-sawing stock, IPO was ‘incredibly successful’ after challenges of Liberation Day tariff timing
By Sharon GoldmanDecember 9, 2025
1 hour ago
Arm CEO on stage at Brainstorm AI
AIBrainstorm AI
Physical AI robots will automate ‘large sections’ of factory work in the next decade, Arm CEO says
By Beatrice NolanDecember 9, 2025
3 hours ago
AIBrainstorm AI
‘Customers don’t care about AI’—they just want to boost cash flow and make ends meet, Intuit CEO says
By Jason MaDecember 9, 2025
5 hours ago
A man and robot sitting opposite each other.
AIEye on AI
The problem with ‘human in the loop’ AI? Often, it’s the humans
By Jeremy KahnDecember 9, 2025
5 hours ago

Most Popular

placeholder alt text
Success
When David Ellison was 13, his billionaire father Larry bought him a plane. He competed in air shows before leaving it to become a Hollywood executive
By Dave SmithDecember 9, 2025
14 hours ago
placeholder alt text
Real Estate
The 'Great Housing Reset' is coming: Income growth will outpace home-price growth in 2026, Redfin forecasts
By Nino PaoliDecember 6, 2025
4 days ago
placeholder alt text
Success
Craigslist founder signs the Giving Pledge, and his fortune will go to military families, fighting cyberattacks—and a pigeon rescue
By Sydney LakeDecember 8, 2025
1 day ago
placeholder alt text
Investing
Baby boomers have now 'gobbled up' nearly one-third of America's wealth share, and they're leaving Gen Z and millennials behind
By Sasha RogelbergDecember 8, 2025
1 day ago
placeholder alt text
Uncategorized
Transforming customer support through intelligent AI operations
By Lauren ChomiukNovember 26, 2025
13 days ago
placeholder alt text
Banking
Jamie Dimon taps Jeff Bezos, Michael Dell, and Ford CEO Jim Farley to advise JPMorgan's $1.5 trillion national security initiative
By Nino PaoliDecember 9, 2025
5 hours ago
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Leadership
  • Success
  • Tech
  • Asia
  • Europe
  • Environment
  • Fortune Crypto
  • Health
  • Retail
  • Lifestyle
  • Politics
  • Newsletters
  • Magazine
  • Features
  • Commentary
  • Mpw
  • CEO Initiative
  • Conferences
  • Personal Finance
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map

© 2025 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.