How Decades of Downzoning Shaped San Diego's Neighborhoods — and Pushed Growth Into the Suburbs

In 1967, San Diego adopted its first general plan — and within years, neighborhood after neighborhood was quietly rezoned to allow less housing than had been legal the day before. Not less than what was being built. Less than what was already there. Duplexes on blocks full of duplexes. Apartment buildings in corridors already lined with apartment buildings. The city drew lines around what existed and said: nothing more dense than this, ever. That single policy shift, repeated across decades, is the origin story of the housing crisis San Diego is still living through today.

Downzoning — the planning term for reducing what a parcel of land is allowed to hold — took off in San Diego after that first general plan landed, according to KPBS's investigation into the practice. What followed was a slow, parcel-by-parcel tightening that locked established neighborhoods into lower densities while demand for housing kept growing. The math was always going to produce a shortage.

I've spent more than a decade watching this play out in real time across our agent network — in North Park, in Mission Valley, in Point Loma. The way neighborhoods look today, the price points buyers face, the places people end up moving to when they can't afford closer in — none of that is accidental. It was designed, even when it wasn't fully understood.

Zoning as a Tool — and What Historians Say About It

Historian and author Richard Rothstein, who wrote The Color of Law: A Forgotten History of How Our Government Segregated America, has been direct about how zoning has functioned in American cities. As courts and legislators began dismantling explicitly discriminatory housing laws, zoning stepped in as a subtler instrument. Rothstein told KPBS that certain planning language can function as a dog whistle — shaping who ends up where without ever stating it plainly.

That context matters when you're reading the history of San Diego's downzoning. The decisions weren't always framed in those terms, and intent is genuinely contested neighborhood by neighborhood. But the effect — locking lower-density, higher-cost housing into proximity to jobs and transit, while pushing higher-density options outward — is measurable. You can see it in commute patterns. You can see it in where affordability still exists within the county.

What Downzoning Actually Did to the Landscape

Picture Mission Hills — a neighborhood already built out with duplexes, small bungalows, and modest apartment buildings before the 1967 general plan. The KPBS reporting captured what those streets look like today: a duplex here, a small bungalow there, a bus stop in front of a low-slung apartment building. That fabric was already in place. Downzoning didn't demolish it — it just made it illegal to build anything like it again on the surrounding parcels.

Multiply that across dozens of established neighborhoods and you get a city that can't replenish its own housing stock as the population grows. Every unit lost to fire, age, or redevelopment shrinks the pool. New units, at higher densities, can't legally replace them where demand is highest. So growth went where it was allowed: outward. Chula Vista expanded. New master-planned communities pushed into North County. Carmel Valley was built largely from scratch. The sprawl people experience as a traffic problem is, at its root, a zoning story.

The Reversal Now Underway

San Diego is in the middle of a genuine reversal. The city has been working through Land Development Code changes and state-mandated upzoning — California has passed a wave of legislation in recent years requiring cities to allow more housing near transit, to permit ADUs by right, and to streamline approval for certain infill projects. The same SDSU Mission Valley development that displaced Qualcomm Stadium is a local symbol of this shift: a large, transit-adjacent site getting dense, mixed-use development rather than single-family homes or surface parking.

None of this is painless. Long-established neighborhoods are having real arguments about density, parking, neighborhood character, and infrastructure capacity. Those are legitimate conversations. But understanding where they start — with decades of downzoning that created the shortage driving them — changes how you hear the debate.

What Remains Today

The physical evidence of downzoning is everywhere you look in San Diego's older neighborhoods. The duplex sitting on a lot next to single-family homes in North Park? Likely a pre-1967 remnant, legal when built but no longer replicable under the zoning that replaced it. The surface parking lots in Downtown San Diego that seem wildly out of place on valuable urban land? Often a product of parcels zoned in ways that made redevelopment harder than holding.

Mission Hills street scenes — duplexes alongside bungalows alongside small apartment buildings — are a living archive of what San Diego's built environment looked like before the general plan froze it in place. The bus stops and transit infrastructure that were built to serve density that was then legislated away are visible all over the city's older corridors.

Why It Still Matters Today

If you're a buyer trying to understand why a two-bedroom in Point Loma costs what it does, or an investor trying to read where infill opportunity is emerging, or a homeowner watching your neighborhood change and wondering why — this history is the foundation.

The affordability crisis is not a mystery. It's the predictable result of policy choices made over fifty years, now colliding with a state mandate to reverse course. The rezoning fights happening now in San Diego's city council chambers are the sequel to decisions made in 1967 and the decades that followed. Knowing that doesn't make the housing market easier to navigate. But it makes it legible. And legibility is where smarter decisions start.

Frequently Asked Questions

What does downzoning mean in plain terms?

Downzoning is when a local government changes land use rules to allow fewer or less dense homes on a given parcel or in a given area — for example, rezoning land that previously allowed apartments to only allow single-family homes. In San Diego, according to KPBS, this practice accelerated after the city adopted its first general plan in 1967, effectively limiting how much new housing could be built in already-developed neighborhoods.

How did downzoning contribute to San Diego's housing shortage?

By reducing what could legally be built in established neighborhoods — particularly those already served by transit and jobs — downzoning meant that housing supply couldn't keep pace with population growth. When dense, walkable areas couldn't add units, growth shifted to the suburban fringe, producing both sprawl and higher prices closer in. The shortage buyers experience today is partly a direct consequence of those accumulated zoning decisions.

Is San Diego changing its zoning rules now?

Yes. The city is working through Land Development Code updates and is subject to California state legislation that requires more housing near transit, streamlines ADU approvals, and limits cities' ability to block certain infill projects. Developments like SDSU Mission Valley represent the new direction, though implementation is uneven and neighborhood-level debates about density continue across the city.

Source: KPBS