San Francisco Zoning Intelligence

San Francisco encodes the base zone, height limit (in feet), and bulk type directly into the zone code string. C-2 is Commercial Community Business, 65 is a 65-foot height limit, and the final letter (X, A, D, E, J, etc.) indicates a bulk district that governs massing constraints beyond simple height limits. The /PEG-SUD suffix adds the Priority Equity Geographies Special Use District overlay, which imposes additional requirements around displacement prevention and community-serving uses in low-income neighborhoods.

The BR-MU-48-X (3.47 acres) and BR-MU-78-X (13.14 acres) districts are project-specific planned designations for the Balboa Reservoir infill site, a former SFPUC reservoir converted to a major mixed-use housing development. These designations illustrate San Francisco's practice of creating bespoke zone codes for large-scale infill projects, where the standard base zone series does not provide the right envelope. Developers pursuing similarly complex infill sites should expect a general plan amendment and rezoning process.

The C-3-G district is the city's highest-intensity commercial designation, covering the Financial District and neighboring downtown areas. Like all C-3 zones, it allows the broadest range of commercial, office, hotel, and residential uses and typically carries the tallest height limits in the city. The C-3-G codes in the zone list include PEG-SUD overlays on several parcels, indicating that equity and anti-displacement requirements have been layered onto portions of the downtown core as part of more recent planning amendments.

San Francisco has adopted its own ADU ordinance that in many respects exceeds state minimums, particularly for backyard cottages and garage conversions in its dense residential fabric. The density bonus law is actively used in the city's multifamily pipeline, often combined with 100% affordable housing financing. SB-9 applies city-wide in single-family zones but has limited practical impact in San Francisco given that the city has relatively few single-family parcels and already permits higher densities in most residential areas.

Projects within a PEG-SUD overlay go through standard Planning Department review but must also address Priority Equity Geographies standards, which can include community outreach requirements, restrictions on formula retail or PDR-displacing uses, and anti-displacement commitments for residential projects. The overlay does not prohibit development but adds procedural steps and may restrict certain use types that would otherwise be permitted in the base C-2 zone. Early pre-application consultation with the Planning Department is strongly recommended on PEG-SUD sites.