Opening Angelo Joseph Rossi (pictured 1937) spoke at the dedication ceremony for the building on July 31, 1937. was based in the
South of Market neighborhood, Twitter officially completed their relocation in June 2012, occupying the seventh, eighth, and ninth floors. and in August of that year, they sold a 98 percent stake in the building to the asset management division of
JPMorgan Chase, with a valuation of $920 million. At the time, in addition to Twitter, which was still the majority leaseholder, other tenants in the building included
Yammer, a social networking service owned by
Microsoft, and several
fine dining restaurants in the building's lower levels. In 2017, a new skyway was added to connect Market Square to Mart 2, as the previous bridge had been removed in 2011 due to not being compliant with the
Americans with Disabilities Act of 1990. In April of that year, prior to the acquisition, Musk had tweeted about converting Twitter's headquarters into a
homeless shelter, which generated some support from fellow business magnate
Jeff Bezos. In December of that year, following the acquisition, the
New York Post reported that Musk could relocate Twitter's headquarters from San Francisco following an incident wherein the city launched a probe into possible zoning violations performed by the company. Around this time, on November 17, an activist projected signs onto the side of the building that were critical of Musk. By January 2023, Twitter's physical presence in the building had declined from six floors to just two floors. That same month, a lawsuit was filed in a California superior court alleging that the company had failed to pay rent for both December 2022 and January 2023 on the Market Square property. The lawsuit, filed by the building's landlords, additionally accused the company of violating the
letter of credit stipulation in their lease. In July 2023, Musk initiated a rebrand of the website from Twitter to X, and on the morning of July 24, a large logo X was projected onto the side of the building. That same month, Musk announced that the company's headquarters would remain in San Francisco, saying in a post on the website: In late July 2023, a large metal X sign was installed atop the building. This sign was later dismantled and removed after the city issued a
notice of violation. Prior to this, the
San Francisco Police Department had stopped workers from removing a Twitter sign off of the building because they had not properly secured the worksite before beginning the dismantling. By the following month, the company released an internal email saying that they would be leaving Market Square over the next few weeks. The email was sent out several weeks after Musk had publicly expressed interest in moving X's headquarters to Austin, Texas, though the email said that employees at the Market Square location would be relocated to either an X office in
San Jose or a shared space with
xAI, another Musk-owned company, in
Palo Alto. == Notes ==