Contra Costa County, CA Cap Rates by Neighborhood

County-Wide Gross Yield: A Number That Conceals More Than It Reveals

At the county-wide level, Contra Costa's gross yield sits at 4.42%, derived from a $2,901 median monthly rent against a $786,730 median home price. That number is technically accurate and nearly useless for investment decisions.

The problem is averaging. A $2.6 million Alamo estate and a $550,000 San Pablo duplex both feed into that median, yet their yield profiles sit at opposite ends of the spectrum. The county spans a $2 million price gap between its most and least expensive cities. When you fold that range into a single gross yield figure, the result reflects no specific acquirable asset.

The spread between sub-markets is where real underwriting lives. A 4.42% gross yield on an $800,000 Walnut Creek single-family is a cash-flow-negative appreciation bet. The same gross yield on a $550,000 San Pablo duplex with an ADU path is a different animal entirely, and the net cap rate on each diverges further once taxes, insurance, and regulatory costs enter the model.

Property Tax Drag on Net Cap Rates

Before breaking out neighborhoods, the tax math deserves a standalone look because Measure A changed the baseline for every property in the county.

California's Prop 13 sets the baseline at 1.0%, but Contra Costa's effective rate runs 1.0%–1.3% before Measure A. The November 2024 passage of Measure A added 0.50% countywide. Investors should underwrite a minimum effective rate of 1.25%–1.5% plus any applicable Mello-Roos.

At the $786,730 median price, the annual property tax burden at a 1.5% effective rate is $11,801. Against a gross annual rent of $34,812 (12 months at $2,901), that one line item consumes 33.9% of gross rent before vacancy, management, maintenance, or insurance. At a 1.25% rate, the tax bill is $9,834, still 28.2% of gross rent.

The practical consequence: gross yield of 4.42% compresses to a net operating yield of roughly 2.0%–2.8% on a stabilized median-priced asset, assuming standard operating expense ratios. That is below the 7%–8% gross yield threshold required for positive debt service at current mortgage rates. The county-wide figure is not a cap rate investment market in the traditional sense. It is an appreciation market with select pockets where ADU income or workforce housing pricing can tilt the math.

Neighborhood and Sub-Market Breakdown

Premium Central County: Walnut Creek, Danville, Lafayette, Alamo

These Lamorinda and central county cities anchor the appreciation end of the spectrum. Alamo's median listing price is about $2.6 million. Lafayette and Danville run well above the county median. At those price levels, even aggressive rent assumptions produce gross yields in the 2.5%–3.5% range on SFR assets.

Net cap rates in this tier, after the Measure A-adjusted tax load and wildfire insurance costs (discussed below), likely land in the 1.5%–2.5% range on stabilized assets. The investment thesis here is not yield. It is long-run price appreciation supported by top-rated schools, scarce inventory, and proximity to the San Francisco Bay Area employment core.

Wildfire exposure adds a specific cost layer. About 84% of county properties face wildfire risk over a 30-year horizon, and the Diablo Range foothills submarkets (Danville, Lafayette, Alamo) sit in the most exposed zone. Landlord insurance premiums in these areas have risen and, in some cases, carriers have non-renewed policies. Investors must obtain insurance quotes before closing, not after, and bake actual premium costs into the net yield model.

Mid-County Workforce Corridor: Concord, Pittsburg, San Pablo

This tier offers the county's most legible yield math. San Pablo's median price is about $550,000, roughly 30% below the county median. Assuming comparable rental rates in the $2,400–$2,700 range for SFR assets, gross yields in San Pablo approach 5.2%–5.9%.

At a 1.5% effective tax rate on a $550,000 acquisition, annual taxes run $8,250. That still consumes a large share of gross rent, but the starting yield gives more room to absorb operating costs before hitting zero NOI.

Concord's 2025–2026 assessed value growth came in at 3.10%, below the county average of 4.18%, and Pittsburg posted 2.96%. Modest assessment growth in these cities suggests softer near-term appreciation relative to the county average, but it also signals a more negotiable buyer environment. Days on market rose from about 22 days in 2024 to about 28 days in 2025 countywide, and this trend is more pronounced in mid-county cities.

San Pablo posted the county's highest city-level assessed value growth at 5.81% for the 2025–2026 roll, signaling gentrification pressure. That dynamic can support rent growth in workforce housing but also compresses the cap rate for buyers entering today at higher basis prices.

East County BART Nodes: Antioch, Pittsburg Center

The eBART extension, a 10-mile line that opened in 2018, added Pittsburg Center and Antioch stations to the BART network. East County cities are priced 30%–40% below the county median, creating the most yield-accessible entry points in the system.

Warehouse and logistics payrolls in the Transportation, Warehousing and Utilities sector grew 6.9% year-over-year through Q1 2024 in Contra Costa, against a state-level decline of 0.1%. That job growth concentrates in East County and supports workforce housing demand independent of the commuter-to-SF thesis.

The net yield calculus in East County carries a specific risk adjustment: flood exposure. East County communities along the Delta and Carquinez Strait shoreline carry SFHA designation in several zones. About 19% of county properties face severe flood risk. In Antioch, Pittsburg, and Bay Point, investors must verify FEMA flood zone status property by property. Mandatory NFIP flood insurance on SFHA-designated parcels adds $1,500–$3,000+ annually to operating costs, compressing net yields by 30–55 basis points at the $550,000–$650,000 price points typical of the area.

Sub-Market Comparison

Estimated net yield ranges assume standard operating expenses (vacancy, management, maintenance) at 35%–40% of gross rent plus Measure A-adjusted property tax at 1.25%–1.5% of purchase price. Insurance cost varies by flood and wildfire zone.

Cap Rate Compression vs. Decompression

County-wide prices are down 2.51% year-over-year through mid-2025, while BART-area rental demand has held. When prices fall and rents hold or rise, gross yields expand, meaning cap rates decompress. That is the current direction in Contra Costa.

The decompression is modest, not a reset. Inventory remains deeply undersupplied at 1.54 months, against a balanced market threshold of 4–6 months, so sellers have not been forced into distressed pricing. The sold-to-list ratio of 100.6% as of January 2025 confirms this. Buyers are gaining negotiating room on the margin, not extracting deep discounts.

For investors, the opportunity is at the intersection of price softness and rental resilience: East and mid-county assets near BART stations where the price decline feeds directly into yield improvement without equivalent rent deterioration.

Cap Rate Outlook

Three factors will drive net yield movement over the next 12–36 months in Contra Costa.

First, the Measure A tax increment is now baked in permanently. Any pro forma built on pre-November-2024 tax assumptions is understated. The 0.5% addition is not temporary.

Second, TOD upzoning around BART stations represents the most credible path to cap rate expansion through income growth. BART's 2024 Transit-Oriented Development Work Plan prioritizes residential density at most Contra Costa stops. Properties within a half-mile of BART stations that can absorb density bonuses or ADU additions sit at the best intersection of near-term yield and long-term value creation. The ADU impact-fee exemption for units under 750 square feet reduces the cost basis for adding rental income, directly improving project-level returns.

Third, insurance costs remain a wildcard. With 84% of county properties carrying 30-year wildfire risk, the homeowners and landlord insurance market in California is in structural re-pricing. Premium increases that outpace rent growth compress net yields in foothills submarkets regardless of what happens to home prices.

Investors positioned in BART-proximate East and mid-county SFRs with ADU potential, underwritten at a 1.5% effective tax rate and with verified insurance costs, have the strongest path to stabilized net yields in the 3.0%–3.8% range. That is not a cash-flow-first market, but it is a defensible hold in a chronically undersupplied Bay Area corridor.

Model your specific deal with our investment property calculator to stress-test these assumptions against your actual acquisition cost, financing terms, and target hold period.