Wikimedia Foundation headquarters

Wikimedia Foundation administrative space
	One Sansome Street
Mailing and physical address	One Sansome Street, Suite 1895, San Francisco, California 94104
Occupied	1 October 2024 - present
Building constructed	1984
Building LEED Certification	Platinum
Total office space	2,607 square feet (242 m2)

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Wikimedia Foundation staff and contractors participate with the volunteer community in maintaining this page's content.

The Wikimedia Foundation's administrative space is located on the 18th floor of One Sansome Street in San Francisco in California within the United States. The building is near three other locations in San Francisco that the Foundation previously used as its headquarters. Prior to moving to San Francisco, the headquarters was located in St. Petersburg in Florida within the United States.

Nearly the entire organization is remote, with nearly half of the Foundation's workforce based outside of the United States. Wikimedia Foundation staff do not in general work from the administrative space in San Francisco and it is not meant for daily office use by the organization or open to the public.

One Sansome Street

One Sansome Street from Sutter Street and Sansome Street.

One Sansome Street is a 41-story office building located in the Financial District of San Francisco, California.

This location is a few blocks away from our previous location at One Montgomery Tower, is LEED Platinum certified, and allows us to further reduce our square footage while meeting our office space priorities for business operations.

With a 86% reduction in space compared to our previous office, its current setup is meant to reflect the evolving international and virtual work nature of the organization as it exists in 2024. As a result, the current setup is focused on support of limited legal and business operations as well as small group meetings and activities.

Location

Please note that the Wikimedia Foundation offices are not open to the public. You must have an invitation or appointment before your arrival.

One Sansome Street is located at the intersection of Sutter and Sansome Streets in San Francisco's Financial District. Its main entrance is on Sansome Street.

The Wikimedia Foundation offices are located on the 18th floor in Suite 1895.

Hosting an event at the office

Groups interested in hosting a small gathering at the office must contact the Wikimedia Foundation's Working Environments team via email (we wikimedia.org) at least two weeks prior to the desired date. The offices are otherwise not open to the public, and unfortunately we cannot accommodate short-notice requests.

History

One Sansome Street is the fifth location which the Wikimedia Foundation has utilized for its headquarters, and the fourth in San Francisco.

St. Petersburg, Florida

From the Wikimedia Foundation's founding in 2003 until 2007, the Wikimedia Foundation was located in St. Petersburg in Florida within the United States. The headquarters in Florida was closed on 31 January 2008.

39 Stillman Street

In 2007, the Wikimedia Foundation decided to move from its Florida office. San Francisco was chosen as the destination and the move was completed by the end of January 2008.

149 New Montgomery Street

149 New Montgomery

In 2009, the Wikimedia Foundation moved approximately half a mile (under a kilometer) to 149 New Montgomery Street, and eventually occupied three floors of the building until October 2017.

One Montgomery Tower

Set Knowledge Free mural in One Montgomery Tower

In October 2017, the Wikimedia Foundation moved approximately a quarter of a mile (less than half a kilometer) to One Montgomery Tower - part of the Post Montgomery Center, occupying the sixteenth floor of the building until October 2024.

Operating leases

The Wikimedia Foundation entered into a four-year non-cancelable operating lease for its current office headquarters in San Francisco which began on 1 October 2024 and concludes in 2028, with an option to extend.

Historical data

Costs

Wikimedia Foundation staff and contractors do not actively participate in maintaining this section's content.

Year	Lease payments
2008	$103,121
2009	$119,153
2010	$280,382
2011	$585,114
2012	$683,640
2013	$1,005,896
2014	$1,230,176
2015	$1,291,452
2016	$1,341,844
2017	$1,292,625
2018	$1,440,110
2019	$1,489,134
(Future minimum payments)
2020	$1,481,050
2021	$1,525,482
2022	$1,571,247
2023	$1,618,384
2024	$1,666,935