Why San Diego Is Building Apartments Faster Than Anywhere Else in California - YouTube
Why San Diego Is Building Apartments Faster Than Anywhere Else in California - YouTube
San Diego's Housing Boom: The Harder Questions
How the construction surge is really affecting the city's budget, who actually benefits from the new units, and whether water, power, and transit can absorb the growth
In This Report
- The Fiscal Picture: What New Construction Does (and Doesn't) Do for City Finances
- The Affordability Gap: Who Is This Boom Actually Housing?
- The "Filtering" Debate: Does High-End Supply Ever Help Lower-End Renters?
- Infrastructure: Water
- Infrastructure: Electric Power
- Infrastructure: Public Transit
- Synthesis: Strengths, Gaps, and Open Questions
1. The Fiscal Picture: What New Construction Does (and Doesn't) Do for City Finances
San Diego is building at a pace not seen in decades, and every new multifamily building that completes and sells generates a fresh assessed value that enters the property tax rolls. Under Proposition 13, that value is locked in at the sale price, growing at only 2 percent annually unless the property changes hands again. For a 400-unit luxury tower selling for $200 million, the initial property tax contribution to all taxing jurisdictions — city, county, schools, and special districts — can easily exceed $2 million per year at the standard 1 percent base rate plus bond assessments. Multiply that across thousands of new units and the cumulative effect on the county's tax base is measurable.
The San Diego County Assessor certified the 2025 gross assessed value roll at a record $806 billion, up 4.95 percent from the prior year's record of $768 billion — the 13th consecutive year of growth. The City of San Diego alone contributed the largest single-jurisdiction dollar increase in 2024: $19.3 billion in new assessed value. New construction is one of the three main drivers of assessed value growth alongside change-in-ownership reassessments and the annual 2 percent CPI adjustment.
The Structural Deficit Problem
Here is the central fiscal paradox: the city is simultaneously experiencing record assessed values and a severe structural budget deficit. The reason reveals the limits of new construction as a fiscal solution. New property tax revenue flows broadly to all taxing jurisdictions — the county, schools, transit, and other special districts each claim shares — and the city's direct portion is only one slice. Meanwhile, the city's expenditure obligations, led by pension costs, infrastructure maintenance, public safety, and homelessness services, have grown faster than any single revenue stream.
Mayor Todd Gloria's FY2026 draft budget confronted a $258 million structural deficit — described by the city's Independent Budget Analyst as a decades-long problem of ongoing spending outpacing revenue. Voters rejected a sales tax increase (Measure E) in November 2024 that was projected to generate $400 million annually. The city responded with service cuts (library closures on Sundays and Mondays), new fees for parking, parks, and waste collection, and tapping general fund reserves for the first time in at least a decade. By February 2026 the city faced an additional $31 million mid-year shortfall driven partly by a drop in its profit-sharing arrangement with SDG&E.
Development Fees: An Underappreciated Revenue Stream — and a Cost Driver
New housing development also generates "impact fees" and permitting revenue directly for the city. These fees are intended to offset the cost of infrastructure and services that new residents will require. San Diego's development impact fees average roughly $29,000 per unit according to the RAND April 2025 study — far below LA and San Francisco, but still representing a significant one-time revenue source for infrastructure capital accounts. On a 500-unit project that's roughly $14.5 million in fees before construction even begins.
However, the same RAND study notes these fees are ten to forty times higher in California than in Texas, adding meaningfully to the break-even rent required for a project to pencil out financially. This creates a tension: fees fund infrastructure needs but also contribute to the very market-rate pricing that frustrates affordability. The city has acknowledged this tradeoff. Video transcripts from the building industry note that roughly 40 percent of the cost of a new home in San Diego stems from the regulatory and fee environment — a number that aligns with the RAND findings.
What New Construction Cannot Fix
New market-rate apartments help the tax base gradually. But San Diego's fiscal challenges are structural, not cyclical. The city's pension obligations, deferred infrastructure maintenance, and the cost of homelessness services are not meaningfully offset by incremental property tax additions from apartment towers. The city's independent budget analyst delivered a sobering message in December 2025: "The city's constituents may ultimately be better served by providing fewer services well than more services poorly." Against that backdrop, the construction boom is a fiscal tailwind, not a solution.
2. The Affordability Gap: Who Is This Boom Actually Housing?
Your skepticism about who the new units actually serve is well-grounded by the data. The construction surge is overwhelmingly producing market-rate apartments at rents that are far beyond the reach of low- and moderate-income San Diegans — and the city's own reports acknowledge this directly.
In downtown San Diego alone, 1,894 new homes were completed in 2024. Of those, only 174 — fewer than 10 percent — were income-restricted affordable units. Studios in the new market-rate towers start at around $2,400 per month. The average rent in San Diego County as of late 2025 was approximately $2,520, according to CoStar — and that was after six consecutive months of modest declines. Zillow ranked San Diego the nation's third most expensive rental market, trailing only New York City and San Jose.
The city's performance on the state-mandated affordable housing targets is deeply lopsided. Against a mandate to plan for 108,036 units between 2021 and 2029, San Diego is ahead of pace for market-rate units but severely behind on every affordable category. The city has approved only 743 of a state-mandated 19,319 moderate-income units (3.8 percent), 2,737 of 17,331 low-income units (15.8 percent), and 2,366 of 27,459 very-low-income units (8.6 percent).
The San Diego Magazine profile of the affordability crisis puts a human face on this dynamic: a healthcare worker earning $24.92/hour pays $2,000 monthly for a two-bedroom in Golden Hill — more than half her income — and faces displacement as developers plan to demolish her building for a luxury replacement. Landlords commonly require proof of income at three times the asking rent, which for a $2,400 studio means earning at least $86,400 annually.
Displacement and the Missing Middle
A particular problem is what urban planners call "missing middle" housing — the two- and three-bedroom units at moderate rents that families with children require. As the KPBS/Voice of San Diego housing permit analysis found, the vast majority of new construction in dense urban neighborhoods consists of studios and one-bedrooms. Families are effectively being priced out not just of ownership but of rental options anywhere near employment centers, schools, and transit.
The Building Industry Association's CEO has pointed to the regulatory cost environment as the root cause: roughly 40 percent of a new home's cost in San Diego is attributable to government fees, mandates, and approvals. Until those structural costs come down, developers have a strong economic incentive to build at price points that justify the carrying cost — and those price points leave most San Diego households behind.
3. The "Filtering" Debate: Does High-End Supply Eventually Help?
The standard economic argument for building market-rate housing — even expensive market-rate housing — is known as "filtering." In theory, new luxury units absorb demand from high-income renters, which over time reduces competitive pressure on older, less expensive units, allowing rents to soften across the market. The evidence from San Diego's current cycle is mixed, with some early signs supporting the theory and others casting doubt on its applicability to this particular market.
Supporting the filtering argument: San Diego County apartment rents declined for six consecutive months through late 2025, according to CoStar — the first annual rent decrease since 2010. The county vacancy rate rose to 5.7 percent by late 2025, the highest level since 2009 (compared to a historic low of 2.64 percent in 2021). Downtown San Diego saw the steepest rent decline at -1.4 percent as new towers flooded that submarket with supply. These are real effects.
"With the past three months alone, each recorded the same negative 0.4% rent growth — consistent downward pressure rather than a temporary fluctuation." — Joshua Ohl, CoStar Senior Director of Market Analytics, December 2025
However, the filtering argument has important limitations in San Diego's context. First, the cycle is long: research suggests it typically takes 10 to 20 years for new luxury units to filter down to moderate income levels — far too slow to address an acute shortage affecting people now. Second, as San Diego Magazine documented, the construction of new luxury buildings sometimes directly displaces existing affordable tenants when older buildings are demolished to make way for them. Third, the rent declines being observed are concentrated in the market-rate Class A segment; Class B and C vacancies in San Diego remained unusually tight at roughly 2.5 percent in Q4 2024, according to JPMorgan Chase's multifamily outlook — meaning the affordable segment of the market has not softened meaningfully.
| Market Segment | Vacancy Rate, Q4 2024 | Rent Trend | New Supply Reaching Segment? |
|---|---|---|---|
| Class A (luxury) | 6.6% | Declining (−1.4% downtown) | Yes — primary recipient of new construction |
| Class B (mid-range) | ~3.5–4% | Flat to modest increase | Limited filtering so far |
| Class C (workforce/affordable) | ~2.5% (very tight) | Rising or flat; no meaningful relief | No new supply reaching this segment |
| Deed-Restricted Affordable | Near zero (chronic waitlists) | Fixed by subsidy; demand vastly exceeds supply | Far behind state mandates |
4. Infrastructure: Water
San Diego has historically been one of California's most water-dependent cities, importing roughly 80 to 85 percent of its supply from the Metropolitan Water District of Southern California and the Colorado River. That dependence has been the city's greatest infrastructure vulnerability — and it is now being directly addressed through one of the most ambitious water infrastructure programs in American municipal history.
Pure Water San Diego: A Game-Changer
The Pure Water San Diego program is a multi-phase, multi-billion-dollar water recycling initiative that will eventually provide nearly half the city's water supply locally by 2035. The Phase 1 North City projects — involving a new advanced water purification facility, expanded wastewater reclamation, new pipelines, and pump stations across communities from Morena to Scripps Ranch — were designed to deliver 30 million gallons per day (MGD) of purified recycled water to the Miramar Reservoir by the end of 2025. Phase 2 will add 53 MGD more by 2035, bringing the total to 83 MGD from local recycled sources.
The Phase 1 construction is funded in part through a $388 million EPA Water Infrastructure Finance and Innovation Act (WIFIA) loan — one of the largest such federal water infrastructure loans in the country. An additional $733 million in WIFIA funding supports the stormwater infrastructure component. These investments are explicitly designed to provide a drought-resilient water supply that grows the region's capacity rather than merely managing current demand.
The San Diego County Water Authority's 2024 Water Facilities Master Plan, reviewed by its board in early 2025, is designed to address water infrastructure needs through 2045 under multiple demand and supply scenarios. It explicitly accounts for projected growth in housing units.
5. Infrastructure: Electric Power
San Diego's electric grid faces a more complicated picture. SDG&E serves 3.7 million customers through 1.49 million electric meters and is investing aggressively in grid modernization — but electricity in San Diego is already among the most expensive in the country, and the combination of new housing-driven load growth, grid upgrades, and California's electrification mandates is pushing costs higher.
Grid Investment and Capacity
SDG&E's major grid investments include expanding and modernizing substations to increase capacity, undergrounding overhead lines to reduce wildfire risk and improve reliability, and — most significantly — building out a substantial battery energy storage portfolio. In March 2025, the California PUC approved SDG&E's expansion of the Westside Canal Battery Energy Storage System by 100 MW, adding to an existing 131 MW facility. By year-end 2025, SDG&E's utility-owned battery storage portfolio was projected to reach nearly 480 MW of power capacity and over 1.9 gigawatt-hours (GWh) of energy storage — enough to buffer peak demand and integrate more renewable energy. The utility has been deploying community microgrids across the county, designed to maintain power to critical facilities during grid stress events.
Sunrise Powerlink, the primary east-west transmission corridor bringing up to 1,000 MW of renewable energy from the Imperial Valley into San Diego, remains the region's main high-capacity transmission artery. No new major long-distance transmission corridors were announced as of early 2026; instead, current utility priorities focus on grid hardening, substation upgrades, and storage deployment to manage peak loads and integrate distributed solar from the region's substantial rooftop PV base.
6. Infrastructure: Public Transit
San Diego's Metropolitan Transit System (MTS) presents the most interesting and double-edged infrastructure story of the three. The trolley and bus system is strong by national standards — and housing-driven density is both a potential savior and an ongoing challenge for its financial model.
A System in Recovery
MTS ridership surpassed 80 million annual passenger trips for the first time since the pandemic in Fiscal Year 2025 (July 2024–June 2025), recording 81.18 million boardings — a 7.1 percent increase over FY2024. The San Diego Trolley, which reached the highest ridership of any light rail system in the United States in 2023, continues to recover. The $2.1 billion Mid-Coast Corridor Blue Line extension to UCSD and University City, completed in 2021, drove a 52 percent ridership increase in its first year of operation. In 2025, MTS operated 25 electric buses and committed to purchasing only zero-emission vehicles starting in 2029.
The Transit-Housing Density Connection
A KPBS analysis of MTS ridership data published in August 2025 makes a pointed argument: San Diego's restrictions on development near certain trolley stations are contributing to MTS's financial struggles. The analysis found that the Grantville Station on the Green Line saw a 65 percent increase in boardings after MTS partnered with developers to build two apartment projects directly on the station's parking lot. UC Berkeley's Ethan Elkind, whose research focuses on transit-oriented development, explained the dynamic: "It's not enough just to build rail. You have to make sure that the local governments that have land use authority are allowing apartments to be built around the rail transit stops."
Conversely, the analysis found that when development near stations is artificially suppressed — as has been the case near certain Blue Line stations in Clairemont — ridership suffers and the concentration of development pressure on a small number of permitted parcels produces bidding wars that generate only high-end units. This is precisely the dynamic your question identifies: zoning that concentrates density in small zones drives up land costs and favors luxury development over the broader, denser housing fabric that would serve transit best.
Service Coverage Gaps
Transit coverage in San Diego remains highly uneven geographically. KPBS found that coastal neighborhoods — Point Loma, Ocean Beach, Pacific Beach, La Jolla — produced only a small fraction of the city's new housing. These are precisely the areas with the worst transit access. Meanwhile, most new housing is concentrated in downtown, Bankers Hill, North Park, Mission Valley, and Kearny Mesa — areas with substantially better trolley and rapid bus access. This alignment between new construction and transit infrastructure is one of the genuinely positive aspects of San Diego's current approach, driven by the Complete Communities program's emphasis on development within one mile of major transit.
Where the system still struggles is first- and last-mile connectivity. Many trolley stations remain car-centric — surrounded by surface parking rather than walkable development — and pedestrian and bicycle infrastructure to and from stations is often poor. For lower-income residents who depend on transit, the quality of the walk from their home to the nearest stop matters enormously.
7. Synthesis: Strengths, Gaps, and Open Questions
🚰 Water Supply
Pure Water program provides a credible, locally controlled capacity expansion path through 2035. Federal-funded, demand-responsive, drought-resilient. The infrastructure investment is scaled to projected housing growth.
Adequate — improving⚡ Electric Power
SDG&E investing in storage and grid hardening. Capacity is not the concern — rates are. San Diego already has California's highest utility rates, and rate trajectory is upward. New tenants can afford this; low-income residents cannot easily.
Capacity: OK • Cost: Concern🚋 Public Transit
MTS ridership rebounding strongly. TOD-adjacent housing demonstrably boosts ridership. SB79 should unlock more walkable, transit-connected development. First/last mile connectivity and geographic coverage gaps remain.
Growing — structural gaps remain🏠 Affordable Housing
Only 9% of new Downtown units are affordable. City is critically behind on mandated moderate, low, and very-low income targets. Filtering will help market-rate renters over 10–20 years but provides no near-term relief for low-income households.
Critical Gap💰 City Fiscal Position
New construction contributes to record assessed values and property tax revenue. But the city's structural deficit is driven by pension obligations and deferred maintenance — neither of which new apartments can cure. Budget pressures are real and ongoing.
Positive contribution — not sufficient🔄 Market Rent Relief
New supply is beginning to moderate Class A rents — vacancies at a 16-year high in late 2025, first annual rent decline since 2010. Class C and workforce housing vacancies remain extremely tight at ~2.5%. The filtering effect is real but slow and unevenly distributed.
Emerging — uneven by segmentThe Bottom Line on Your Question
The San Diego construction boom is largely — though not exclusively — producing top-of-market housing. This is a market-driven outcome: California's regulatory and cost environment makes it nearly impossible to build new housing at price points affordable to moderate- or lower-income households without public subsidy. The roughly 40 percent regulatory cost component documented by RAND is not a small inefficiency; it is the structural reason why market forces alone cannot solve San Diego's affordability crisis.
The housing boom is contributing to the city's tax base, helping to moderate market-rate rents at the top of the market, and — when built near transit — generating a virtuous cycle of ridership and walkability. Water infrastructure is being proactively expanded. Electric power capacity is adequate, though rates are a growing burden. Transit is improving but needs more housing density around its stations, not less.
What the boom is not doing, and cannot do without substantially more public subsidy, reformed development economics, or mandatory inclusionary ratios, is house the healthcare workers, service workers, teachers, and lower-income San Diegans who make the city function. The city is far behind its state-mandated affordable housing targets. The new residents moving into the 34-story luxury tower with the Whole Foods ground floor are not the people who need housing relief most urgently. And the structural budget deficit means the city has limited capacity to fund the subsidized housing programs that could close the gap.
That tension — between a genuine and valuable construction surge and the persistent, deepening unaffordability that affects most of the city's households — is the central unresolved challenge of San Diego's housing policy moment.
Sources & Formal Citations
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