Board certifies Warriors project EIR and affirms subdivision map after lengthy appeals

The Board of Supervisors voted on Dec. 8 to certify the final Subsequent Environmental Impact Report (SEIR) for the proposed Golden State Warriors event center and mixed-use development in Mission Bay and to approve the project's tentative subdivision map after multiple appeals and a full-day public hearing.

The board heard more than three hours of appellant testimony, technical presentations from city planning and transportation staff, and more than one hundred public comments for and against the plan. Opponents focused their arguments on the adequacy of the SEIR's traffic and transit analysis, potential impacts on emergency access to the adjacent UCSF Medical Center, and the sufficiency of alternatives analyzed under CEQA.

City staff and the Office of Community Investment and Infrastructure (OCII) defended the SEIR and the mitigation commitments. Planning and SFMTA staff outlined a multi-layered Transportation Management Plan and a local hospital access plan to prioritize emergency vehicle access and deploy parking-control officers (PCOs), expanded transit service and event-day operations. OCII and the Warriors organization also described commitments negotiated with UCSF intended to reduce overlapping event impacts and preserve hospital access.

After considering the testimony and the written record, the board certified the SEIR and affirmed the project's tentative subdivision map. The board also approved related measures to manage event impacts, including establishing a fund and governance mechanisms intended to finance and coordinate transportation mitigation and services tied to the event center.

Why it matters: The Warriors event center is a major private development on public land in a dense, transit-reliant area whose operations could change traffic, transit demand and emergency routes in central San Francisco. The project will trigger capital investments and ongoing operational mitigation to manage those effects, and the board's decision clears a major regulatory hurdle for the project to proceed to the entitlement and implementation phases.

What the board decided: The board certified the SEIR as adequate for decision-making and affirmed the tentative subdivision map after the formal appeal process. Staff and the Warriors team emphasized the SEIR's identification of significant impacts for which mitigation measures were proposed; opponents continued to argue selected measures lacked sufficient enforceability or failed to analyze feasible off-site alternatives. The city and project sponsor contend a multi-part mitigation package, including funding, monitoring and a Transportation Management Center, will limit impacts.

Next steps: With the SEIR certified and the subdivision map affirmed, the developer may proceed through entitlement steps and building approvals. The board directed a package of ordinances and agreements to fund and oversee the long-term transportation and public-safety mitigation measures; those items also moved forward at the Dec. 8 meeting.

Speakers quoted in this article include: Tom Lippy (appellant attorney), Dan Smith (traffic consultant), Tiffany Bohe (OCII executive director), Chris Kern (planning department)."