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Supervisors advance short-term zoning controls to discourage single-family 'replacement' projects in dense districts
Summary
The committee advanced interim controls that would require conditional use authorization when projects fail to maximize principally permitted residential density in RC, RTO and RM districts for an 18-month experimental period; supporters said the measure preserves permitted density while opponents warned interim rules could complicate permitting without full analysis.
The Land Use & Transportation Committee moved Jan. 10 to forward an ordinance establishing interim zoning controls intended to discourage construction of large single-family homes on parcels zoned for multi-unit housing in San Francisco's denser RC, RTO and RM districts.
Supervisor Aaron Peskin introduced the experiment as a narrow, temporary measure designed to preserve the city's intended density on lots where the zoning already allows multiple units. Under the interim controls, a builder who does not maximize the principally permitted residential density on a parcel would need to obtain conditional use authorization. The proposal includes exemptions (for modest expansions under 25% that do not create units larger than 2,000 sq ft) and specifies that the baseline is "principally permitted" density rather than additional density derived from state density bonus or other code incentives.
Supporters, including Planning Department staff who participated in drafting, said the measure is a targeted attempt to stop market-driven "downzoning" where land zoned for multiple units is instead developed as a single large unit, which subsidizes luxury housing and undermines housing production.
Opponents countered that interim controls add process and uncertainty and urged a comprehensive planning analysis before adopting time-limited controls citywide. Architects and housing advocates recommended carrots (fee reductions, streamlined ministerial approvals for projects that reach maximum density) rather than sticks. Several speakers also warned the measure, if applied unevenly across neighborhoods, could exacerbate zoning inequities.
The committee adopted drafting clarifications (definitions of density baseline and unit-size thresholds) and forwarded the item to the full Board for further consideration and public review.
What's next: The full Board will consider the interim controls as a committee report; Planning Department staff will monitor impacts during the 18-month period if enacted and produce follow-up analysis.
