Palo Alto — Land Use

Last reviewed: July 2, 2026

Overview

This page explains what the Palo Alto zoning ordinance (Title 18) actually says about which land uses are allowed where in the city, how conditional uses work, and which chapters/tables to read for decisions. For quick rule checks consult the city’s development standards and the applicable district land-use table; both drive whether a use is permitted outright or needs a Conditional Use Permit. § 18.10.030, § 18.13.030, § 18.18.050, § 18.20.030 and related chapters are the controlling land-use tables and purposes used throughout the city.

Note: this page stays focused on land use (what is allowed where and under what process). For site dimension and lot-permit mechanics see the linked development standards and the city chapters noted below; for building code work consult the California Building Standards Code. /us/california/palo-alto/development-standards /us/california/building-codes

How Palo Alto structures land-use rules (short)

• Each zoning district has a purpose statement and a land-use table showing uses as P (permitted) or CUP (conditional). See the district chapters and their land-use Table 1 entries for the official list. § 18.10.030, § 18.13.030, § 18.18.050, § 18.20.030, § 18.28.040.
• Many uses (e.g., daycare centers, private schools, certain retail or outdoor storage, hazardous materials) are explicitly identified as CUP in the table or by cross-reference. See the district tables. § 18.10.030, § 18.20.030.
• For uses not listed, the director may treat a use as similar and require a CUP. See § 18.28.040 and the CUP chapter § 18.76.010.

District-by-district (decision-focused)

Each subsection below summarizes the district purpose, typical permitted uses, key decision triggers (CUP or limits), and where the district normally applies. Bolded district names and the controlling § are shown.

R-E, R-2, RMD (Low-density residential)

• Purpose: RE, R-2, RMD support low-density single-family/two-unit housing and limited accessory uses. § 18.10.010.
• Typical permitted uses: single-family and two-family dwellings, Accessory Dwelling Units (ADUs), home occupations, gardening; many community/institutional uses require CUP. See § 18.10.030 (Table 1).
• Key limits / standards: ADUs are explicitly permitted subject to Chapter 18.09; agricultural sales on-site have specific limits (no permanent sales structures). See § 18.10.030 and § 18.09.
• Where it applies: typical single-family neighborhoods; R-1 standards and subdistrict rules are handled in Chapter 18.12 (see cross-reference in Chapter 18.10). § 18.10.010.

First natural mention of ADUs linked: /us/california/palo-alto/adu

RM-20, RM-30, RM-40 (Multiple-family residential)

• Purpose: RM-20, RM-30, RM-40 provide medium to high-density multi-family housing with standards to limit impacts on lower-density neighbors. § 18.13.020 – § 18.13.030.
• Typical permitted uses: multi-family residential, accessory uses, ADUs, limited public/quasi-public uses (many require CUP). § 18.13.030.
• Key standards: densities described in the chapter (e.g., RM-30 = 16–30 du/acre; RM-40 = 31–40 du/acre) and local development standards in Chapter 18.13 and cross-referenced chapters. § 18.13.020–.030.
• Where it applies: larger parcels near transit, downtown, or designated higher-density areas. Verify site-specific allowable density and design rules. Verify with the jurisdiction.

CD (Downtown Commercial)

• Purpose: CD (Downtown Commercial) seeks a broad mix of commercial, service, and residential uses while preserving ground-floor retail character. § 18.18.010.
• Typical permitted uses: retail, eating & drinking services, offices (with ground-floor limitations), multi-family, hotels where allowed. See permitted uses table for CD variants (CD-C, CD-S, CD-N). § 18.18.050.
• Key limits: ground-floor retail preservation rules, special floor-area rules for hotels, and downtown-specific context and design criteria. Consult § 18.18.050–.120.
• Where it applies: central downtown zoning map parcels. Verify ground-floor use requirements for a particular block. Verify with the jurisdiction.

First natural mention of design-review linked: /us/california/palo-alto/design-review

CN, CS, CC, CC(2), NV (Neighborhood & Commercial zones)

• Purpose: neighborhood-serving retail and services with mixed-use potential; some zones restrict exclusively residential ground-floor uses. See Chapters for CN/CS rules and CN office grandfathering. § 18.16.100, § 18.18.050, § 18.16.060.
• Typical permitted uses: retail, personal and professional services, limited offices (some office uses are grandfathered and subject to size caps). § 18.16.100 (CN office grandfathering & limits).
• Key limits: exclusive-residential projects are generally prohibited in some CN/CS areas except on Housing Element opportunity sites; office uses on CN have size limits and grandfathering rules. § 18.16.060–.100.

First natural mention of overlay districts linked: /us/california/palo-alto/overlay-districts

MOR, ROLM, RP, RP(5), GM (Office, Research, Manufacturing)

• Purpose: MOR, ROLM, RP, RP(5), GM target medical office/research, research/office/limited manufacturing, research parks, and general light manufacturing. § 18.20.010.
• Typical permitted uses: research & development, limited manufacturing, support offices, accessory uses; specialized uses (hazardous materials tiers, Tier 2 uses) have extra controls or may be prohibited in some districts (e.g., Tier 3 not permitted). § 18.20.030 and related hazardous materials rules.
• Key limits: outdoor activities restricted on some subdistricts; hazardous materials, BSL-4 agents, and Tier 3 uses are restricted/prohibited and may require CUP plus fire-chief approvals and notifications. § 18.20.030.
• Where it applies: industrial parks, Stanford-adjacent research zones, north/east/west industrial areas shown on the zoning map. Verify with the jurisdiction.

First natural mention of parking linked: /us/california/palo-alto/parking

PF, OS, AC (Special Purpose Districts)

• Purpose: PF (public facilities), OS (open space), AC (airport compatibility or other special). Specific site standards in the special-purpose chapter. § 18.28.040–.050.
• Typical permitted uses: parks, botanical conservatories, public facilities, limited accessory retail or eating where tied to park use — many uses are CUP. § 18.28.040 (Table 1).
• Key standards: minimum site sizes, setbacks, FAR caps in Table 2 of Chapter 18.28. § 18.28.050.
• Where it applies: City-owned property, parks, and special parcels designated on zoning map.

PTOD combining district (California Avenue, Downtown PTOD)

• Purpose: PTOD encourages pedestrian/transit-oriented mixed-use near transit corridors. § 18.34.020.
• Typical permitted uses: mixed-use residential/non-residential, multi-family, hotels (subject to limits), live/work (often CUP). § 18.34.030.
• Key standards: special FAR caps, height, and dwelling unit caps differ by PTOD area (see Table 2 in § 18.34.040). § 18.34.040.
• Where it applies: specific PTOD geographic boundaries shown on the city’s zoning maps. Verify parcel inclusion. Verify with the jurisdiction.

Quick reference table — common uses across districts

(Use the district-specific tables in the cited chapters as the authoritative source for edge cases and accessory use cross-references — see the Code References in the right column.)

Key processes that change allowed uses

• Conditional Use Permit: required where the land-use table marks CUP or where the director treats a use as similar to a listed CUP use. See § 18.76.010 for findings, conditions, and process.
• Combining/overlay districts: combining districts such as PTOD, (R) retail overlays, and others modify allowed uses and development standards; always confirm whether a parcel is inside an overlay. § 18.34.020, cross-references in Chapters 18.30 and others.
• Grandfathered / nonconforming uses: uses lawful before zoning changes may remain as legal nonconforming or be grandfathered under rules in the chapters (see CN office grandfathering example). Verify Chapter 18.70 and each district’s grandfathering rules. § 18.16.100 discusses CN grandfathering; see nonconforming uses chapter.

First natural mention of nonconforming uses linked: /us/california/palo-alto/nonconforming-uses

Checklist (what an applicant must satisfy to confirm a proposed use)

• Identify parcel zoning and all overlays on the Zoning Map (verify PTOD, (R), NP, AD overlays). Verify with the jurisdiction. § 18.34.020.
• Consult the district Table 1 for that district (e.g., § 18.10.030, § 18.13.030, § 18.18.050, § 18.20.030).
• If the use is a CUP in the table, prepare for CUP findings and neighborhood/public notice requirements under § 18.76.010.
• Check applicable development standards (setbacks, FAR, height, lot coverage) in the district chapter and Chapter(s) referenced (e.g., 18.10.040, 18.13.040, 18.18.060, 18.20.040). /us/california/palo-alto/development-standards
• Determine parking requirements per Chs. 18.52 and 18.54 and design review triggers (if any). /us/california/palo-alto/parking
• For ADUs, follow Chapter 18.09 and state ADU law where referenced. /us/california/palo-alto/adu /us/california/california-adu-laws
• Identify whether the use involves hazardous materials, outdoor storage, or late-night activity — these commonly trigger CUP, performance standards, or special approvals (see industrial chapter § 18.20.050 and hazardous materials rules).

Risks & Ambiguities

Plain-English Summary

Palo Alto’s Title 18 zoning organizes allowed activities by named districts (for example R-E, RM-30, CD, MOR). Each district’s Table 1 lists uses as Permitted (P) or Conditional (CUP); if your planned use is CUP you must meet the CUP findings in § 18.76.010 and likely go through public notice. Always check overlays, ADU rules, and parking/design-review triggers — they frequently change whether a use can proceed.

Source References

• Palo Alto Zoning — Low-Density Residential Uses: § 18.10.030.
• Palo Alto Zoning — Multiple-Family Uses: § 18.13.030.
• Palo Alto Zoning — Downtown Commercial Uses: § 18.18.050.
• Palo Alto Zoning — Office/Research/Manufacturing districts and uses: § 18.20.010, § 18.20.030.
• Palo Alto Zoning — Special Purpose Districts (PF/OS/AC): § 18.28.040–.050.
• Palo Alto Zoning — PTOD combining district uses and standards: § 18.34.020–.040.
• Conditional Use Permit process and findings: § 18.76.010.
• ADU rules cross-reference: Chapter 18.09 (referenced from district tables).
• Parking and development standards cross-references: Chapters 18.52, 18.54, and district development standards chapters (various). /us/california/palo-alto/parking /us/california/palo-alto/development-standards

(If you want direct links to the municipal code text for a single parcel or to the city zoning map, verify on the City of Palo Alto Planning website or contact the Planning Department. Verify with the jurisdiction.)

Retrieved passages

• Palo Alto Zoning Code (§ 2) High relevance show source text
• Palo Alto Zoning Code High relevance show source text
• Palo Alto Zoning Code (Section 18.23.100) High relevance show source text
• Palo Alto Zoning Code (Chapter 18.09.) High relevance show source text
• Palo Alto Zoning Code (chapter and) High relevance show source text
• Palo Alto Zoning Code (Title 15) High relevance show source text
• Palo Alto Zoning Code (§2) High relevance show source text
• Palo Alto Zoning Code (Chapter 18.76) High relevance show source text

Cited sections

• Palo Alto Zoning — Low-Density Residential Uses: **§ 18.10.030**. (§ 18.10.030)
• Palo Alto Zoning — Multiple-Family Uses: **§ 18.13.030**. (§ 18.13.030)
• Palo Alto Zoning — Downtown Commercial Uses: **§ 18.18.050**. (§ 18.18.050)
• Palo Alto Zoning — Office/Research/Manufacturing districts and uses: **§ 18.20.010**, **§ 18.20.030**. (§ 18.20.010)
• Palo Alto Zoning — Special Purpose Districts (PF/OS/AC): **§ 18.28.040–.050**. (§ 18.28.040)
• Palo Alto Zoning — PTOD combining district uses and standards: **§ 18.34.020–.040**. (§ 18.34.020)
• Conditional Use Permit process and findings: **§ 18.76.010**. (§ 18.76.010)
• ADU rules cross-reference: Chapter **18.09** (referenced from district tables).
• Parking and development standards cross-references: Chapters **18.52**, **18.54**, and district development standards chapters (various). /us/california/palo-alto/parking /us/california/palo-alto/development-standards
• PaloAlto_ZoningCode.md

• Official Palo Alto code library