How updated state laws and high-stakes neighborhood advocacy are shaping a new residential future on the border of Palo Alto and Los Altos Hills.
The intersection of Old Trace Road and Arastradero Road has become the center of a high stakes debate over the future of Palo Alto. On one side, the push for housing density is fueled by aggressive state mandates and developers like Steel Bridge Capital. On the other, a community deeply concerned about wildfire safety and the limits of existing infrastructure. For decades, this one acre lot remained a quiet, vacant piece of land. Today, it represents the front line of California’s housing crisis, where the immediate need for shelter meets the non negotiable requirement for public safety.
In May 2026, the Palo Alto City Council faced a defining moment. With a 6-0 vote, the council moved forward with a plan that includes 16 dwelling units, six detached houses, and several accessory dwelling units. This decision did not happen in a vacuum. It was the result of years of legislative shifts, including the invocation of Senate Bill 330 and the newly implemented protections of Assembly Bill 130. Neighbors have voiced significant fears regarding evacuation routes and fire hazard severity. They point to the narrow, winding nature of Old Trace Road as a potential bottleneck during a disaster. But the city and the developer maintain that modern building codes and objective safety standards provide the necessary guardrails.
This project is a case study in how to navigate the tension between growth and protection. It highlights the power of state laws to override local resistance while simultaneously testing the city's ability to enforce fire safety in the Wildland Urban Interface. As construction nears, the focus shifts from legal battles to execution. The project must now prove that it can deliver middle income housing without compromising the safety of the surrounding neighborhood. It is a balance that every city in the Bay Area is currently trying to strike.
What you will learn
- How SB 330 and AB 130 limit a city’s ability to deny housing projects based on discretionary concerns.
- The specific design and density details of the 4103 Old Trace Road project, including its affordable housing components.
- The critical role of fire safety regulations and wildfire hazard zones in shaping residential development in the Palo Alto hills.
The Evolution of 4103 Old Trace Road
The journey of the Old Trace Road Infill began with a preliminary application that sought to maximize the potential of a suburban lot. Steel Bridge Capital, the project developer, recognized early on that the site’s location near the Santa Cruz mountain range would present unique challenges. The initial proposal was for 15 units, but updated filings in May 2026 increased that number to 16. This shift was more than just adding a single unit. It reflected a strategy to leverage the State Density Bonus to its fullest extent. By including deed restricted units for moderate income households, the developer unlocked the ability to build more densely than local zoning typically allows.
Ponderosa Architecture led the design effort, focusing on a mix of two story wood frame structures. The aesthetic is a blend of stucco, stone veneer, and wood siding, intended to ground the modern units within the existing character of the neighborhood. The lot subdivision creates nine residential parcels. This includes six detached single family houses paired with junior accessory dwelling units (JADUs), plus two attached units also with JADUs. This configuration is a direct response to the "missing middle" housing demand in Palo Alto, where traditional single family homes are financially out of reach for many professionals.
The Power and Limits of SB 330
Senate Bill 330, also known as the Housing Crisis Act of 2019, is the primary legal lever for this project. SB 330 was designed to stop cities from changing the rules mid stream. Once a preliminary application is filed, the local development standards, zoning, and fees are "locked in" (City of East Palo Alto) [3]. For the Old Trace Road project, this meant Palo Alto could not suddenly downzone the acre or add new discretionary hurdles that would make the project unfeasible. The law effectively caps the number of public hearings at five, preventing the "death by a thousand meetings" that has historically stalled Bay Area housing.
However, SB 330 does not give developers a free pass on safety. The law explicitly does not waive fire codes, building codes, or objective safety standards (Crede Group) [1]. While Palo Alto residents argued that the project should be denied due to fire risk, SB 330 requires that any denial be based on "objective, quantifiable, written public health or safety standards" (City of East Palo Alto) [3]. Because the project site is located in a primarily built up suburban area near Alta Mesa Memorial Park, it sits just outside the State's "Very High Fire Hazard Severity Zone" (VHFHSZ) (SF YIMBY) [5]. This distinction is critical. If the site were within the VHFHSZ, the city would have had significantly more latitude to deny or drastically reduce the project’s scale.
Understanding the AB 130 Factor
A new player entered the regulatory landscape in 2025: Assembly Bill 130. This legislation expanded the protections for infill housing and introduced a freeze on most new residential building code changes until mid 2031. AB 130 created a full CEQA exemption for qualifying housing projects on sites of 20 acres or less (ABAG) [7]. To qualify, the project must meet specific siting criteria, including those related to hazardous areas and fire hazard severity. Unlike previous rules that might have required a full Environmental Impact Report (EIR) for any project in a sensitive area, AB 130 narrows the focus.
For projects like the Old Trace Road Infill, AB 130 means that the CEQA analysis is limited specifically to the effects caused by the hazardous condition (DLA Piper) [11]. If the only concern is wildfire risk, the review stays focused on wildfire risk. It does not open the door for critics to demand analysis of every possible cumulative impact. This focus allows the city and the developer to concentrate on practical mitigations, such as road width, hydrant spacing, and fire resistant building materials, rather than getting lost in the weeds of speculative environmental impacts.
Fire Safety and the Wildland Urban Interface
The most vocal opposition to the Old Trace Road Infill comes from neighbors who fear for their lives. A Change.org petition gathered hundreds of signatures from residents who argue that Arastradero Road and Old Trace Road are already at capacity (Change.org) [2]. They point to the 2018 Camp Fire and the 2020 CZU Lightning Complex as proof that evacuation in the hills can turn deadly in minutes. The concern is simple: adding 16 units means adding more cars and more people to a street network that was not designed for high density.
In response, the city’s fire department and the developer’s engineers must meet the California Fire Code’s objective requirements. This includes ensuring adequate turning radii for fire trucks and sufficient water pressure for sprinklers. Even though the project invoked SB 330, Palo Alto retains the power to require "home hardening" techniques. These include ember resistant vents, non combustible siding, and specific vegetation management plans (California HCD) [4]. The 6-0 council vote indicates that the council members felt these objective safety measures, combined with the project’s legal protections, were enough to move the needle toward approval.
The Math of Middle Income Housing
One of the most compelling aspects of the Old Trace Road Infill is its commitment to the 100% Area Median Income (AMI) bracket. One of the attached units and its associated ADU are deed restricted for households at this income level. In Santa Clara County, the 2025 AMI for a four person household was approximately $195,200 (City of Santa Clara) [14]. While this may sound like a high figure in other parts of the country, in Palo Alto, this represents the "missing middle", teachers, firefighters, and healthcare workers who often find themselves overqualified for traditional low income housing but priced out of the luxury market.
By providing these units, the project fulfills a key requirement of the city’s Housing Element. The State of California has mandated that Palo Alto plan for over 6,000 new units by 2031 (City of Palo Alto) [15]. Projects like this one, while small in the grand scheme of things, are essential to meeting those targets. They provide a model for how suburban infill can work without the massive scale of a high rise, maintaining a "neighborhood feel" while still pushing the density envelope.
Timeline of the Old Trace Road Infill
| Milestone | Date | Significance | Source |
|---|---|---|---|
| Preliminary SB 330 Application | Oct 2025 | Initial 15-unit plan filed to "lock in" rules. | SF YIMBY |
| Neighborhood Petition Launched | Nov 2025 | Residents organized against density citing fire risk. | Change.org |
| AB 130 Implementation | Jan 2026 | New CEQA exemptions for infill housing took effect. | ABAG |
| Planning Staff Review | Feb 2026 | Technical analysis of fire truck turning radii and hydrants. | City of Palo Alto |
| Updated Plans Filed | May 2026 | Unit count increased to 16 with added JADUs. | SF YIMBY |
| City Council Vote | May 2026 | 6-0 approval to move forward with the infill project. | [User Data] |
| Final Design Approval | Est. Aug 2026 | Expected completion of architectural review. | [Atlas Premier] |
| Building Permits Issued | Est. Dec 2026 | Transition from entitlement to active construction. | [Atlas Premier] |
Design and Density Breakdown
The architectural approach by Ponderosa Architecture attempts to soften the blow of increased density by distributing the units across multiple structures rather than one large block. This "cottage cluster" style is increasingly popular in Bay Area suburbs.
| Element | Specification |
|---|---|
| Total Units | 16 (8 primary units + 8 JADUs) |
| Lot Size | 1.0 Acre |
| Affordability | 1 Unit + JADU restricted to 100% AMI |
| Parking | Surface and garage integrated per unit |
| Structures | 6 detached structures, 2 attached structures |
| Primary Materials | Stucco, Stone Veneer, Wood Siding |
| Maximum Height | 2 Stories (Wood Frame) |
Case Example: The Hillside Infill Precedent
The 4103 Old Trace Road project shares striking similarities with the controversial "North Berkeley Hills" infill of 2023. In that case, a developer proposed 12 units on a similar one acre lot within a High Fire Hazard Severity Zone. Neighbors sued, claiming that the project violated local wildfire ordinances. The courts eventually ruled in favor of the developer, citing the Housing Accountability Act (HAA) and the fact that the city could not provide objective evidence that the project would create a "significant, unavoidable impact" on public safety that could not be mitigated (Holland & Knight) [13].
This precedent shifted the burden of proof from the developer to the city and the protestors. In Palo Alto, the developer of Old Trace Road has already proactively included fire mitigation measures that exceed the base code. By doing so, they have made it nearly impossible for the city to deny the project without violating state law. The 6-0 council vote reflects a realization among local officials that they are better off approving a well mitigated project than losing a costly lawsuit to the State of California.
What Smart Critics Argue
- Evacuation Bottlenecks: Critics argue that "objective standards" fail to account for human panic. While a fire truck might be able to get in during a drill, hundreds of residents trying to get out on a Tuesday afternoon is a different reality (Change.org) [2].
- Infrastructure Lag: Neighbors claim that utility infrastructure, including water pressure and sewage, is already stretched to its limit in the foothills. They argue that the city should focus on infrastructure upgrades before approving more density.
- The "Trojan Horse" ADU: Some argue that the use of JADUs is a loophole to bypass density limits. They worry that "16 units" is a low estimate and that these properties will eventually house far more people than the street can support.
- Neighborhood Character: A persistent argument is that multi unit clusters destroy the suburban fabric of Palo Alto. Critics believe that high density belongs in the urban core, not on the edges of the open space preserve.
Key Takeaways
- State laws like SB 330 and AB 130 have significantly reduced the ability of local residents to block housing projects through discretionary appeals.
- Palo Alto is required by the State to plan for 6,000+ new units, making infill projects like Old Trace Road nearly inevitable.
- The project site is technically outside the "Very High Fire Hazard Severity Zone," which limits the legal grounds for denial based on fire risk.
- Modern construction "home hardening" techniques can mitigate wildfire risks even in sensitive hillside areas.
- Middle income housing (100% AMI) is a critical component of the project, serving a workforce that is currently priced out of Palo Alto.
- Objective safety standards, rather than subjective fears, are now the primary benchmark for project approval in California.
- The transition from 15 to 16 units highlights a strategic use of density bonuses to maximize land value and housing production.
Reader Actions
- In your work: If you are a property developer or manager, review your portfolio for underutilized parcels that could benefit from SB 330 streamlining. Learn more about our development services.
- At home: Evaluate your own property for wildfire risks and consider "home hardening" upgrades like ember resistant vents.
- In the community: Attend City Council and Planning Commission meetings to understand how local housing elements are being implemented in your neighborhood.
- In civic life: Stay informed on state housing legislation. Follow organizations like ABAG and the California Department of Housing and Community Development (HCD).
- At the office: For business owners, consider how the lack of middle income housing in Palo Alto affects your ability to recruit and retain talent.
- One extra step: Use the CAL FIRE Fire Hazard Severity Zone Viewer to check the specific hazard rating for your property or potential investment sites.
FAQ
What is SB 330 and how does it affect my neighborhood?
SB 330, the Housing Crisis Act, prevents cities from downzoning or adding new discretionary barriers to housing projects. It "locks in" the rules in place when a developer files a preliminary application.
How is fire safety handled in these new housing projects?
Even with state mandates, all projects must meet the California Fire Code. This includes requirements for road widths, hydrant placement, and fire resistant building materials.
What does 100% AMI mean in Palo Alto?
Area Median Income (AMI) is the midpoint of a region’s income distribution. In Santa Clara County, 100% AMI for a family of four is approximately $195,200.
Can a city still deny a project if it’s in a fire zone?
Yes, but the denial must be based on objective, written safety standards that cannot be mitigated. It is much harder to deny a project under current state law than it was five years ago.
What is a JADU?
A Junior Accessory Dwelling Unit (JADU) is a small residential unit (up to 500 square feet) created within the walls of a single family home. It must have its own entrance and a basic kitchen.
Why did the council vote 6-0 for the Old Trace Road project?
The council likely recognized that the project met all objective safety requirements and was protected by state streamlining laws, making a denial legally and financially risky for the city.
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Sources
- Crede Group, "Understanding California’s SB 330: What You Need to Know," Aug 2024, https://www.credegroup.com/post/understanding-california-s-sb-330-what-you-need-to-know, Accessed May 24, 2026.
- Change.org, "Proposed project at 4103 Old Trace Rd will jeopardize safety and should not be approved," Nov 2025, https://www.change.org/p/proposed-project-at-4103-old-trace-rd-will-jeopardize-safety-and-should-not-be-approved, Accessed May 24, 2026.
- City of East Palo Alto, "SB 330 & 8 – Housing Crisis Act," 2024, https://www.ci.east-palo-alto.ca.us/planning/page/sb-330-8%E2%80%93-housing-crisis-act, Accessed May 24, 2026.
- California Department of Housing and Community Development (HCD), "State Income Limits 2025," https://www.hcd.ca.gov/sites/default/files/docs/grants-and-funding/income-limits-2025.pdf, Accessed May 24, 2026.
- SF YIMBY, "Updated Plans For 4103 Old Trace Road, Palo Alto," May 22, 2026, https://sfyimby.com/2026/05/updated-plans-for-4103-old-trace-road-palo-alto.html, Accessed May 24, 2026.
- SF YIMBY, "Preliminary Plans For Small Infill At 4103 Old Trace Road, Palo Alto," Oct 2025, https://sfyimby.com/2025/10/preliminary-plans-for-small-infill-at-4103-old-trace-road-palo-alto.html, Accessed May 24, 2026.
- ABAG, "AB 130 & SB 131 (2025) Summary," Apr 21, 2026, https://abag.ca.gov/sites/default/files/documents/2026-04/AB-130-SB-131-2025-Summary-Updated-04212026.pdf, Accessed May 24, 2026.
- Buchalter, "California Adopts Consequential Reforms to CEQA," 2025, https://www.buchalter.com/insights/effective-immediately-california-adopts-consequential-reforms-to-ceqa-and-other-laws-to-speed-housing-production/, Accessed May 24, 2026.
- Best Best & Krieger (BBK), "AB 130 and SB 131 Include Updates to Major California Housing Laws," Jul 2025, https://bbklaw.com/resources/la-071025-ab-130-and-sb-131-include-updates-to-major-california-housing-laws, Accessed May 24, 2026.
- City of Encinitas, "SB 330 Housing Crisis Act Guidance," https://www.encinitasca.gov/government/departments/development-services/policy-planning-housing/policy-planning/sb-330-housing-crisis-act, Accessed May 24, 2026.
- DLA Piper, "California Housing Reform: 2025 Update," https://www.dlapiper.com/insights/publications/2025/07/california-housing-reform, Accessed May 24, 2026.
- National Association of Home Builders (NAHB), "California Building Code Pause," Jul 2025, https://www.nahb.org/blog/2025/07/california-building-code-pause, Accessed May 24, 2026.
- Holland & Knight, "California's Summer Blockbuster: Continued Housing Reform," Jul 2025, https://www.hklaw.com/en/insights/publications/2025/07/californias-summer-blockbuster-continued-ab-130-and-sb-131-create, Accessed May 24, 2026.
- City of Santa Clara, "2025 Area Income Levels and Maximum Rent Limits," https://www.santaclaraca.gov/home/showpublisheddocument/76315/638218185503930000, Accessed May 24, 2026.
- City of Palo Alto, "Housing Element 2023-2031," https://www.cityofpaloalto.org, Accessed May 24, 2026.
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