How Seaside Ridge Shapes Del Mar Housing Supply

Stand at the north end of Dog Beach in Del Mar and look up. The bluff overhead has a gazebo perched near its edge, the concrete lookout beneath it now overhanging open air where the cliff face used to be. That erosion is the physical argument at the center of a fight that has run since 2022, and as of this month it just became the only fight left standing between Del Mar and the affordable housing the state says it must build.

If you have been comparing Del Mar to other coastal North County towns, you have already seen the price tag. What the median doesn't tell you is why the supply behind that price isn't coming loose anytime soon, and the answer sits on that bluff.

The Numbers You've Already Seen

As of July 2026, the median sales price for a detached single-family home in Del Mar hit $3,825,000, up 62.8% year over year. Attached homes, condos and townhomes, carried a median of $1,882,500. Neither number is new information if you've spent any time browsing listings here.

What's less visible is how thin the inventory behind those prices has become in just twelve months. Detached-home inventory fell to 37 homes for sale in July 2026, down 24.5% from the year before, with only 3.9 months of supply compared to 6.1 months in July 2025. Homes are moving faster too: a median of 48 days on market, down from 61 the year prior, and detached homes sold for 100.3% of their original list price in July, up from 93.6% a year earlier. That's a market where sellers are routinely getting offers at or above asking.

The condo and townhome side tells a similar story from a different angle. Pending sales rose 16.7% year over year, but inventory tightened even harder, down 41.7% to just 14 homes for sale, with 3.6 months of supply.

Those are not numbers that fix themselves through normal turnover. Del Mar is a small city with very little land left to build on, and for years the city has had exactly two paths to add meaningful new housing stock. One of those paths closed for good this month.

The Site That Could Have Changed the Math

In 2024, the City of Del Mar signed an agreement with the 22nd District Agricultural Association, the state board that runs the Del Mar Fairgrounds, to study building affordable housing on Fairgrounds land. The plan was to place up to 61 affordable units there, covering more than half of what the city owes toward its state-mandated goal of 113 low-income units by 2029.

The city put real money behind it: $1.7 million in state Housing Acceleration Program grant funds went toward feasibility and due diligence studies. The board eventually settled on a site called the Surf and Turf RV Park as the only workable location, but that parcel sits within the City of San Diego's jurisdiction, not Del Mar's, meaning any project there would require an annexation process before the city could even claim credit for it.

On August 19, 2026, the 22nd DAA board voted 5-3 to terminate the agreement. Board members pointed to the complexity of the annexation question and to the uncertainty of asking San Diego's city council, which has four seats up for election this year, to commit to a multi-year process it might not follow through on. Del Mar's mayor, Tracy Martinez, sent a letter days later asking the board to reconsider at its September 15 meeting, but as of now the Fairgrounds path is off the table.

That leaves one site to carry the entire weight of the city's housing obligation.

Why One Bluff Is Doing All the Work

The North Bluff parcel at 929 Border Avenue has sat largely vacant since San Diego philanthropist Carol Lazier bought it in 2001. It's currently zoned for one dwelling unit per acre. In 2022, Lazier's development team proposed Seaside Ridge, a 259-unit apartment project with 85 units set aside as affordable, split between 42 low- and extremely-low-income units and 43 moderate-income units.

Del Mar has rejected the application at every stage, arguing it's missing a rezoning application, a Local Coastal Program amendment, a coastal development permit, and conditional use permits, and that as submitted it conflicts with the city's Local Coastal Program, Land Use Plan, Community Plan, and municipal code. The developer counters that Del Mar lacked a state-certified housing element when the application was filed, which under California's builder's remedy law should let the project bypass local zoning rules entirely.

Here's the timeline that matters for anyone trying to gauge how long this could drag on:

AB 712 isn't a small threat. It entitles developers who win housing lawsuits to attorney's fees and requires courts to impose fines of $10,000 per unit or a minimum $50,000 per violation, multiplied by five for repeat violations in the same housing cycle. For a 259-unit project, that math gets expensive fast for a city Del Mar's size.

The Argument Under the Argument

The public fight over Seaside Ridge is technically about zoning and process, but the deeper dispute is about what's underneath the bluff itself. The developer's geotechnical consultant, Geocon Inc., took samples from the site and concluded the project could be built safely for the next 75 years under a high-emissions, high sea-level-rise scenario, provided buildings sit at least 43 feet from the cliff edge.

A resident-funded group called Friends of the Del Mar North Bluff disagreed. Co-founder Carla Echols-Hayes raised money to hire geotechnical engineer Dave Colbaugh and a Scripps Institution of Oceanography researcher, Adam Young, to review the bluff independently. Their report focused on sea caves burrowing as deep as 30 feet into the base of the cliff, arguing that the true starting point for any setback measurement should begin behind those caves, not at the visible cliff edge. The developer's team has maintained the Coastal Commission's own guidance doesn't require that approach.

Two sets of engineers looking at the same cliff have reached opposite conclusions about whether it can hold nine buildings. That disagreement, not a City Council vote, is the thing actually deciding how fast this gets resolved.

A Conflict-of-Interest Question Now Layered on Top

In July 2026, a Del Mar resident named Debrah Barnes sent city officials a letter raising questions about ties between Seaside Ridge's real estate advisor, Brian Guiltinian, and Mark Arabo, a member of the 22nd DAA board. Campaign finance records show Guiltinian contributed $18,200 to Attorney General Bonta's campaign in 2024, and Arabo contributed the same amount between 2023 and 2024, in the period before Bonta's office intervened over Seaside Ridge.

The City Council responded with a 3-0 vote in August 2026 requesting that the San Diego County District Attorney and the U.S. Attorney's Office investigate potential conflicts involving Bonta and Arabo. Both men have denied any wrongdoing, and Arabo has since voluntarily recused himself from Fairgrounds board discussions related to the housing project. Whatever the outcome, it adds another layer of institutional friction to a project that was already three and a half years into the entitlement process.

What This Means If You're Weighing Del Mar Against Other North County Options

If part of your plan has been to wait out this market on the assumption that more listings, or more new construction, will eventually loosen things up, the events of this year point the other direction. The Fairgrounds path is closed. The North Bluff path is tied up in litigation, dueling geology reports, and a conflict-of-interest investigation that hasn't even started yet. None of that resolves in a single season, and even if Seaside Ridge is eventually approved, it would add rental units, not homes for sale, so it wouldn't touch the resale inventory numbers driving today's prices anyway.

That's the practical takeaway for anyone actively shopping Del Mar right now: the scarcity you're seeing in the current 3.9 months of supply isn't a temporary dip waiting on a pipeline of new construction. It's closer to the current baseline. Homes that fit your criteria, especially anything move-in ready near the village or bluffs, are worth acting on when they appear rather than waiting for a wave of new inventory that isn't close to breaking ground.

A Few Questions Worth Asking Before You Write an Offer

Does the Seaside Ridge dispute affect home values on the North Bluff itself? The project sits on a single vacant parcel at 929 Border Avenue, not on occupied residential lots, so it isn't a disclosure issue for homes already built elsewhere on the bluff. It's relevant mainly as context for how constrained Del Mar's supply pipeline is overall.

What is builder's remedy, in plain terms? It's a provision in California housing law that lets developers bypass certain local zoning rules if a city's housing element hasn't been certified by the state at the time an application is filed. Del Mar disputes that it applies here. That dispute is a core part of why this has taken three years to resolve.

Could this change quickly? Possibly, if a court rules on the builder's remedy question or if the Fairgrounds board reverses course at its September 15 meeting. Neither outcome is something to plan a home search around in the near term.

If you're trying to figure out what a market this tight actually means for your specific budget and timeline, Katie Nelson + Associates works Del Mar and the surrounding coastal North County towns every week and can walk you through what's realistic right now, not what the median suggests in the abstract. Book an appointment and let's talk through your options before the next listing you like gets multiple offers.