Dean Preston

In 2022, Preston pushed for a ballot measure on taxing vacant housing in San Francisco. The tax would only apply to owners of buildings with three or more units when at least one of them has been unoccupied for more than six months in one year. The tax exempted vacant single-family homes and two-unit buildings, including his own home valued at more than $3 million.

In November 2021, Preston sought to halt the city of San Francisco buying a hotel in Japantown which it would use to house homeless people.

In October 2021, Preston voted against the construction of a 495-unit apartment complex (one-quarter of which were designated as affordable housing) on a parking lot next to a BART station. Preston said that the construction of the apartment complex on the parking lot was "gentrification."

In 2020, Preston delayed a major zoning plan which would have led to the construction of thousands of housing units to the Van Ness/Market Street area of San Francisco. He called for a "a race and equity study" of the project.

Preston ran as an incumbent in the November 2020 election, with Brown campaigning for her former seat. He won against Brown by a wide margin. Preston also introduced two ballot initiatives approved by voters in the election. Proposition I raised the transfer tax rate for property sales valued over $10 million, intended to fund affordable housing. Proposition K authorizes the city of San Francisco to build or acquire up to 10,000 units of affordable housing.

In July 2018, Preston, a member of the San Francisco chapter of the Democratic Socialists of America (DSA), became a candidate for the 2019 District 5 Supervisor election, to fill the vacancy left when Breed became mayor. Shortly after, Breed appointed Vallie Brown to the fill the position, and Brown ran as an incumbent. Preston ran as a democratic socialist and won the election by a narrow margin, becoming the first democratic socialist elected to the board in forty years. Preston was sworn in on December 16, 2019.

Since his inauguration in December 2019 to November 2021, Preston opposed development plans and legislative proposals that could have housed more than 28,000 people, including affordable housing for nearly 8,500 people.

Preston has argued, "San Francisco is a shining example of the complete and utter failure of the free market address housing needs." He has blamed homelessness in San Francisco on "unbridled capitalism." He has criticized YIMBYism as "a new face on private market developers' interests." In 2019, Preston opposed California Senate Bill 50, which would have eased housing construction near public transit, arguing that it was a "developer bill." In 2019, Preston spoke against the construction of a 186-unit apartment complex because only 20% of the apartments were for affordable housing while Preston wanted 33%. Preston is a proponent of rent control. In 2021, Preston blocked discussion of a proposal that would have required 50 signatures to invoke the California Environmental Quality Act to block housing projects, rather than just one person complaining. According to the San Francisco Chronicle, Preston appears "to be one of the supervisors most opposed to building market-rate housing".

He authored San Francisco's 2018 Proposition F, which directs the city to establish a universal right to counsel for tenants facing eviction.

Preston ran against incumbent London Breed in the 2016 Board of Supervisors election for District 5 but lost 48% to 52%.

In 2008 Preston founded Tenants Together, a non-profit organization advocating for tenant rights in California. The organization campaigned against California's Proposition 98 that year. The ballot initiative would have abolished rent control across the state but was rejected by voters. Preston spearheaded a series of tenant bootcamps across San Francisco from 2015 to 2017, teaching renters how to protect their rights.

Preston is married. He and his wife live in a single family house in the Alamo Square neighborhood in San Francisco. He has been on the board of the Alamo Square Neighborhood Association. In the early 2000s, he worked to stop fast-food franchises such as Burger King and Domino's Pizza from moving into Alamo Square.

He graduated in 1991 with a major in anthropology and economics. After graduation, the couple moved to Jenckyn's native San Francisco, settling down near Alamo Square. Preston studied law at UC Hastings College of the Law, receiving his J.D. in 1996.

After law school, Preston worked for the law firm of John Burris. He spent the late 1990s working at public interest firms. Preston joined the non-profit Tenderloin Housing Clinic in 2000 and transitioned to tenant rights law.

Dean E. Preston (born 1969/1970) is an American attorney and member of the San Francisco Board of Supervisors. He founded Tenants Together, a California tenant advocacy organization. In November 2019, Preston won a special election to finish Mayor London Breed's term on the San Francisco Board of Supervisors, defeating incumbent Vallie Brown (whom Breed had named to replace her) to represent District 5. He was re-elected in the November 2020 election.