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Planning Commission adopts preservation design standards to guide additions to historic buildings
Summary
The commission unanimously adopted new Preservation Design Standards as an objective chapter of the citywide design standards, intended to guide additions and modifications to category A historic properties when objective review is required by state housing programs.
The Planning Commission unanimously adopted preservation design standards on March 20 that supplement the citywide objective design standards and set rules for additions and alterations to the city’s most significant historic properties (category A) when projects are reviewed under objective standards.
Why it matters: State housing programs and the Housing Accountability Act limit discretionary review for certain housing projects; the city developed objective design standards so projects could be reviewed consistently when subject to state ministerial pathways. The newly adopted Preservation Design Standards establish objective rules for treating character‑defining features, windows, storefronts, massing, articulation and other topics for additions to category A properties, while leaving discretionary review for many other scenarios.
What staff told commissioners: Planning staff framed the standards as limited to category A properties and to additions or modifications to existing buildings, not to new construction. Rebecca Salgado (planning staff) summarized an extensive outreach and revision process that included the Historic Preservation Commission, AIA San Francisco’s Policy and Practice Committee, neighborhood groups and the Office of Economic and Workforce Development. Staff said the standards are meant to be a living document and that the department will return to report on implementation and propose refinements.
Public comment: The American Institute of Architects’ policy committee said it worked closely with staff and supported adoption while noting several items that could need future refinement (corner setbacks, glass‑rail treatment, and differences across building types). Neighborhood groups urged extending some protections to historic districts and category B contributors; staff said a citywide survey and targeted district guidance are planned as follow‑ups.
Vote and result: The commission voted 7–0 to adopt the preservation design standards, and staff said smaller editorial changes can be made administratively while larger changes would come back to the commission for approval.
