San Mateo County, CA Duplexes for Sale

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Updated: Aug 16

Three-Level Duplex Requiring Rehabilitation

922 Vallejo ST, San Francisco, CA 94133

$1,495,000

3,660 sqft 0.06 AC lot

Approximately 3,660 SF across three levels
Two‑unit duplex built in 1906
Situated on a 2,687 sq. ft. lot
Both units are vacant
Significant rehabilitation required

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922 Vallejo ST, San Francisco, CA 94133

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Est. Cap Rate

8.7%
Above avg (5.9%)
Est. NOI

$130K
Annual
Price @ 7% Cap

$1.86M
Above asking
Property Type

Duplex
Built 1906

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Updated: Aug 22

Duplex with Four-Car Garages

1661 Kansas ST, Redwood City, CA 94061

$2,200,000

4,098 sqft 0.18 AC lot

4,098 square feet on a 0.183‑acre lot
Two residences with 3‑bedroom and 2.5‑bath and 2‑bedroom and 2‑bath layouts
Four total attached garage spaces
Second residence includes two private patios
Duplex zoning at 1661 Kansas ST

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Character Duplex with Garage

3122-3124 Pierce Street, San Francisco, CA 94123

$2,895,000

3,624 sqft 0.05 AC lot

Updated kitchens and baths, period details, storage, and a backyard complement the two residences.

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Remodeled Coastal Duplex

Cypress AVE, Moss Beach, CA 94038

$1,198,888

1,190 sqft 0.13 AC lot

Two residential units offer flexible occupancy, rental, or extended-family use near Moss Beach’s coastal amenities.

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Duplex with Four-Car Garages

1661 Kansas Street, Redwood City, CA 94061

$2,200,000

4,098 sqft

Two residences offer separate living areas, private outdoor space, and dedicated garage parking.

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Victorian Duplex with Private Outdoor Spaces

4380 24th ST, San Francisco, CA 94114

$2,498,000

1,760 sqft 0.04 AC lot

Two tenant-occupied residences offer distinct layouts, private outdoor areas, and in-unit laundry.

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Two-Unit Duplex with Central Heating

646-648 Madrid Street, San Francisco, CA 94112

$1,150,000

1,400 sqft 0.06 AC lot

Two-unit duplex featuring central heating, public utilities, and a large backyard plus basement storage area.

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Vacant Duplex with In-Law Unit

15 -17 Harriet ST, San Francisco, CA 94103

$1,399,000

2,700 sqft 0.03 AC lot

Two updated residences provide separate layouts, laundry arrangements, hardwood flooring, and stainless-steel kitchen appliances.

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Duplex with Two Attached Garages

109 Hobart Ave, San Mateo, CA 94402

$2,600,000

3,686 sqft 0.20 AC lot

Renovation-ready 1948 duplex with three-bedroom layouts, separate utility metering, and two attached garages.

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Three-Level Victorian Duplex Property

271 Austin ST, San Francisco, CA 94109

$1,499,999

2,721 sqft 0.03 AC lot

Vacant property with NC3 zoning and an existing office configuration across three levels.

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Duplex with Garage Parking

2025-2027 Lincoln Way, San Francisco, CA 94122

$1,195,000

3,350 sqft 0.06 AC lot

Two comparable flats offer fireplaces, formal dining rooms, updated kitchens, and in-unit laundry facilities.

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Updated Single-Story Duplex

772 Walnut ST, San Bruno, CA 94066

$999,999

1,362 sqft 0.06 AC lot

Two remodeled units offer in-unit laundry, enclosed garages, and private outdoor areas.

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Edwardian Duplex with ADU Permits

3323-3325 26th Street, San Francisco, CA 94110

$1,695,000

2,870 sqft 0.07 AC lot

Two separate flats offer three-bedroom layouts, central heating, storage, and access to a lower-level expansion area.

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Remodeled Duplex with Decks

224-224A Dwight Street, San Francisco, CA 94134

$1,400,000

1,856 sqft 0.05 AC lot

Permitted electrical and plumbing upgrades serve two residential units with separate living layouts and outdoor deck space.

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Two-Bedroom Duplex Investment Property

4 Warren Rd, San Mateo, CA 94401

$2,328,000

3,450 sqft 0.16 AC lot

Duplex with two-bedroom floor plans near downtown amenities and regional transportation connections.

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Duplex with Private Patios

333-335 Crestmont Drive, San Francisco, CA 94131

$2,495,000

2,870 sqft 0.09 AC lot

Two residences offer open interiors, outdoor areas, natural light, and ocean and mountain views in Forest Knolls.

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Mixed-Use Building with Mezzanine

1226 Stockton Street, San Francisco, CA 94133

$3,000,000

6,576 sqft 0.04 AC lot

Includes two remodeled, vacant residential units above commercial space.

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Duplex with Two Remodeled Homes

418 Baden Avenue, South San Francisco, CA 94080

$1,588,000

2,279 sqft

Two updated residences share one lot with separate living areas, garages, and connected outdoor space.

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Duplex With Private Balcony

991 Mills AVE, San Bruno, CA 94066

$999,000

1,052 sqft 0.06 AC lot

Two-unit property with a two-bedroom upper residence, studio lower unit, shared laundry, and backyard space.

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Victorian Duplex with Private Garage

61-61A Diamond Street, San Francisco, CA 94114

$2,495,000

2,771 sqft 0.07 AC lot

Two-residence Victorian property with a vacant main home, separate apartment, garage, deck, and secluded backyard.

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Mixed-Use Property with Commercial Space

5680 Mission Street, San Francisco, CA 94112

$2,100,000

3,306 sqft

Ground-floor commercial space is paired with residential units featuring laundry hookups and a two-car garage.

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Updated Two-Unit Duplex

251 29th Street, San Francisco, CA 94131

$1,995,000

3,520 sqft 0.07 AC lot

Two vacant residences offer matching layouts, fireplaces, eat-in kitchens, and separate laundry areas.

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Duplex with Detached Garage

911 Seville Way, San Mateo, CA 94402

$1,650,000

1,720 sqft

Two-unit residential property near Downtown San Mateo with regional highway access.

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Classic Duplex with Tandem Garage

710-712 9Th Ave, San Francisco, CA 94118

$1,799,000

2,912 sqft 0.06 AC lot

Upper and lower residences provide flexible living arrangements with private outdoor space and convenient neighborhood access.

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San Mateo County, CA Duplexes Market Trends and Statistics

Explore 102 duplexes for sale in San Mateo County, CA, showcased through 102 active listings on our real estate platform. These investment opportunities span a total of 203,625 square feet of properties for sale, with an estimated market value of $176,043,785.

Sale prices for duplexes in San Mateo County, CA start at $800,000, averaging $2,095,759, and reaching up to $19,500,000 — offering options for a variety of budgets and business needs. Daily updated analytics ensure you stay ahead with the latest data and market trends.

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