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Planning Commission hears staff briefing on SB 9 and SB 10; commissioners press for strong local protections
Summary
Staff outlined how SB 9 (duplexes and ministerial lot splits in RH1) and SB 10 (local upzoning to 10 units without CEQA) will apply in San Francisco, highlighted equity concerns and tenancy verification challenges, and fielded commissioner questions about enforcement, design standards, and outreach.
Planning Department staff gave an informational briefing on state laws SB 9 and SB 10 and discussed how cities can tailor implementation.
Sheila (planning staff) summarized SB 9’s core provisions: ministerial approval for eligible RH1 parcels, duplexes allowed, lot‑split options for lots ≥2,400 sq ft, and multiple tenant‑ and historic‑resource exemptions. She provided staff’s estimate that of San Francisco’s ~75,000 RH1 parcels, roughly 50,000 may be SB 9‑eligible and about 32,000 could be lot‑split eligible under size thresholds. “It allows duplexes on RH1 lots smaller than 2,400 square feet and it allows for lot splits with duplexes on parcels larger than 2,400 square feet,” the staff presentation said.
Staff flagged key implementation questions: verifying owner‑occupancy and prior tenant occupancy (the lot‑split path requires a 3‑year owner‑occupancy affidavit), preventing predatory purchase or speculator activity, defining objective design standards that comply with SB 9’s prohibition on subjective design review, and financial barriers for low‑income homeowners. Kate Connor (planning expert in the hearing) emphasized that a robust verification regime will be needed using rent board records, voter rolls, property tax filings and other documentation.
Members of the public and community groups urged strong local amendments: speakers called for an affordability overlay in vulnerable neighborhoods, tenant protections to avoid displacement, technical assistance and financing programs for low‑income homeowners, and rapid testing of tenancy data before January 1 (when the bills take effect). Zachary Weisenberger of Young Community Developers urged “prioritiz[ing] and center[ing] wealth creation for communities historically harmed by single family zoning” and warned that SB 9 alone will not produce below‑market units.
Commissioners spent substantial time on operational questions: how to enforce the 3‑year owner‑occupancy affidavit, what objective design standards could look like (unit parity, setbacks, open space), neighbor notification for ministerial permits, and the department’s capacity to administer verification at short notice. Staff acknowledged the short lead time and said the department will pursue a financial analysis, create tenancy verification tools and consider local objective standards, but cautioned some elements will take time to finalize before Jan. 1.
