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Planning Commission adopts SB 9 massing/permeability standards, defers prescriptive architectural rules
Summary
The Planning Commission voted 7–0 to adopt site and massing standards to govern ministerial SB 9 reviews in San Francisco while continuing work with architects on detailed architectural standards; the action added a 4‑foot interior lot‑line setback, permeability/landscaping requirements, a ban on second‑floor rear roof decks and a minimum 800 sq ft second unit.
The Planning Commission voted unanimously on Jan. 27 to adopt objective massing and site standards to guide ministerial approvals under SB 9 in single‑family zoning districts, while deferring more prescriptive architectural standards for further staff work with design professionals.
Staff had presented SB 9 implementation materials and a feasibility memo by Century Urban showing many SB 9 prototype scenarios remain financially challenging in San Francisco because construction costs are high…
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