Ocean Beach Listing Shows 12 ADUs. San Diego's Cap Isn't Coastal Yet.

A neighbor's sign on the 4600 block of Del Mar Avenue in Ocean Beach, from FOX 5 San Diego coverage republished by OB Rag.

On a hillside block of Del Mar Avenue in Ocean Beach, a small house that last worked as a short-term rental is listed at $3 million, and the listing photos show 12 small apartments lined up in its backyard. San Diego capped ADU Bonus Program projects at four to six units per single-family-zoned lot in 2025, but as of this week the City's own records say that cap has not yet taken effect inside the Coastal Zone.

The short version:

• Neighbors on the 4600 block of Del Mar Avenue are organizing, and weighing an attorney, against a listing that advertises two approved backyard ADUs but pictures 12; FOX 5 reported no specific plans to build yet, and the owner, an LLC, has not explained the proposal.
• San Diego's 2025 ADU reforms, which cap Bonus Program projects on single-family-zoned lots by lot size, took effect citywide on August 22, 2025, except in the Coastal Zone.
• The City still lists the Coastal Zone effective date as "Not yet approved," with California Coastal Commission certification anticipated in 2026, a year with 11 weeks left in it.

What happened on Del Mar Avenue

The fight surfaced on October 7, when FOX 5 San Diego reporter Dan Plante walked the block. The house sits on a hillside in one of Ocean Beach's oldest residential neighborhoods. The listing promotes approval for two ADUs in the backyard, which, by the neighbors' own account, nobody opposes. The pictures on the listing are another matter.

"Twelve units on a single-family property? It's abuse," resident Scott Martinez told the station. Another neighbor, Dr. Mike Sherer, read the $3 million asking price as a bet on a 12-unit build. Resident Madonna Maxwell said the group is looking into hiring an attorney and possibly a consultant. The listing agent declined to comment, and the station was still waiting on the LLC that owns the house.

Here is the part the yard signs skip. Nothing has been permitted at 12 units. The property is for sale, and FOX 5 reported there are no specific plans to start building. Twelve apartments in a listing photo is a rendering, not an entitlement. Renderings are cheap, which is presumably why there are twelve of them.

From the text

The reason a listing can even gesture at 12 units on the coast sits in one line on the City Planning Department's adopted single-issue code updates page, under the July 22, 2025 ADU and JADU amendments (Ordinance O-21989):

Effective outside the Coastal Zone: August 22, 2025 Effective within the Coastal Zone: Not yet approved. Approval is anticipated to occur in 2026.

Those amendments are the ones that, in the City's words, "establish the number of ADU homes allowed in Single Family Zones" under the ADU Home Density Bonus Program, along with evacuation route access, fire sprinklers, parking, penalties, and a new Community Enhancement Fee. When the Council approved the package in June 2025, the City said implementation in the Coastal Zone was "subject to certification by the California Coastal Commission, which is expected in 2026."

What is actually in force on a coastal lot

Until certification, the older Bonus Program text governs coastal lots. The City's ADU toolkit page still describes it plainly: inside a Transit Priority Area, one bonus ADU for every affordable ADU, "and there is no limit to the total amount of ADUs." Outside those areas, one affordable unit buys one bonus unit and no more. The base state allowance the toolkit lists for a single-family lot is far smaller: one ADU and one JADU.

So whether 12 units is even theoretically on the table for this lot comes down to facts the coverage does not settle: its zone, whether it sits inside a transit area, and whether it sits inside the Coastal Zone line. Ocean Beach's community plan doubles as a Local Coastal Program, certified by the Coastal Commission on January 7, 2016, so coastal rules reach well into the neighborhood. Whether they reach this parcel is a parcel-by-parcel question, and it is the first one to answer.

If you are a homeowner or buyer on the coast, that is your checklist too. Pull the zone. Find out whether the lot is in a transit area and inside the Coastal Zone. Then ask the seller which units actually hold permits, because "approved for two" and "pictured with twelve" are different assets at different prices.

Who wins and who loses while the gap stays open

Sellers of coastal lots win, at least on paper: a listing can price in a bonus count that an otherwise identical lot inland could not reach. Neighbors lose predictability, which is why they are reaching for lawyers instead of waiting for a plan check. Buyers carry the real risk. Pay for twelve, and if the Coastal Commission certifies the cap before your permit is secured, you may own a lot entitled to far fewer.

We have watched this movie before. When the 136-unit Chalcifica project in Pacific Beach shrank to 125 units, we flagged the Coastal Zone as the open seam in San Diego's reforms. Two months later, the seam has a listing price. Inland, that same reform caps a single-family-zoned lot at four to six ADUs and JADUs, bonus units included, depending on lot size.

The cross-street check. No other market we cover has a gap like this, because no other market has a bonus to gap. A Los Angeles single-family lot generally gets the state defaults and no density-for-affordability trade, so an LA listing has no bonus to sell. Washington wrote its number into state law: HB 1337 guarantees two ADUs per lot, the same number wherever the law applies. San Diego is the only place where the count on one lot depends on which side of a coastal boundary it sits.

Our read: we expect the "anticipated in 2026" date to slip. With 11 weeks left in the year and the City's own page still reading "Not yet approved," the pattern so far points to the cap reaching the coast in 2027, not 2026, and every month of delay makes coastal lots more valuable to exactly the kind of buyer the 2025 reforms were written to slow down.

What to watch

Three things. The Coastal Commission's San Diego district agenda, where certification of O-21989 would appear. Any permit application on the Del Mar Avenue parcel, which would show the real unit count instead of a picture of one. And the sale itself: a $3 million closing would tell every coastal owner what the gap is worth.

If you are weighing what a coastal San Diego lot can hold under the rules that actually apply today, A-du's build marketplace shows pre-approved ADU plans from city and county catalogs and licensed architects, filtered by what your city approves, with an estimated build cost for each.

The next number on this block will come from either a permit counter or the Coastal Commission, and right now nobody can say which one arrives first.

Elsewhere on the ADU beat

• A new batch of California housing laws replaces the flat impact fee on ADUs over 750 square feet with a charge on only the space above 750, Planetizen.
• New state laws in Maryland and Virginia aim to make backyard units easier to build across the D.C. region, Axios Washington D.C..
• Montgomery County's Planning Board backed a bill that would waive permit fees for affordable ADUs and drop owner occupancy, Bethesda Magazine.