San Mateo County, CA Triplexes for sale

Updated: Oct 1

Three-Unit Craftsman Property

82 Sanchez Street, San Francisco, CA 94114

$2,599,000

4,656 sqft 0.06 AC lot

Three flats, each with approximately three bedrooms and one bathroom
4,656‑square‑foot property on a 0.0597‑acre lot
Each unit includes its own washer and dryer
Wood floors, wainscoting, curved ceilings, and decorative fireplaces
Built in 1905; Craftsman architectural style

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Updated: Sep 8

Edwardian Triplex with Garden

834-838 Dolores Street, San Francisco, CA 94110

$2,595,000

4,074 sqft 0.07 AC lot

Three‑unit Edwardian building constructed in 1906
4,074 square feet on a 0.0746‑acre lot
Upper flat has a flexible two- or three‑bedroom layout and two additional non‑living rooms
Two lower flats each include two bedrooms, a formal dining room, and an eat‑in kitchen
Shared landscaped garden and large basement storage area

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Three-Unit Triplex with Shared Backyard

127-129 Duboce Avenue, San Francisco, CA 94103

$1,795,000

3,932 sqft 0.05 AC lot

Each residence spans a full floor and has its own in-unit laundry.

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Three-Unit Property with Period Detail

21 Belvedere ST, San Francisco, CA 94117

$2,999,999

4,965 sqft

Three residences feature updated kitchens, individual heating systems, and separate gas and electric metering.

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3-Unit Triplex with Owner’s Residence

2275 California Street, San Francisco, CA 94115

$4,500,000

6,000 sqft

Three-unit property combines two occupied flats with a larger residence available vacant at closing.

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Mixed-Use Property With Retail Frontage

4871 Mission ST, San Francisco, CA 94112

$1,200,000

3,075 sqft 0.05 AC lot

NC3-zoned property combines ground-floor commercial space with leased apartments and a separate owner’s unit.

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Well-Maintained Residential Triplex

466 Willow AVE, Half Moon Bay, CA 94019

$1,390,000

3,145 sqft 0.11 AC lot

Three-unit residential property with electric heating, public water service, and a composition roof.

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3-Unit Edwardian Triplex

834-838 Dolores Street, San Francisco, CA 94110

$2,595,000

4,074 sqft

Two flats include formal dining rooms, eat-in kitchens, and laundry porches.

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Vacant Mixed-Use Property

3774 Mission ST, San Francisco, CA 94110

$1,900,000

2,536 sqft 0.06 AC lot

Three updated residential units accompany a street-facing commercial storefront with flexible owner-user potential.

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Coastal Triplex with Three-Car Garage

470 Willow AVE, Half Moon Bay, CA 94019

$1,390,000

3,065 sqft 0.11 AC lot

Fully occupied three-unit property includes laundry facilities and covered parking.

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Triplex with Shared Backyard

1423-1425 47th Avenue, San Francisco, CA 94122

$1,925,000

4,158 sqft

Three residences feature remodeled kitchens, updated living-area floors and parking beneath and beside the building.

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Victorian Triplex with Rooftop Access

1630-1634 Hyde St, San Francisco, CA 94109

$3,699,000

4,830 sqft 0.06 AC lot

Three residential flats share a fenced backyard, patio, and two-car garage.

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Tenant-Occupied Triplex with Garage

1545-1547 Balboa Street, San Francisco, CA 94118

$1,950,000

2,850 sqft 0.06 AC lot

Inner Richmond multifamily property with three residential units and an attached garage.

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Three-Unit Multifamily Property

325-329 Webster Street, San Francisco, CA 94117

$3,495,000

5,035 sqft

Three full-floor residences offer in-unit laundry, renovated kitchens and baths, hardwood flooring, and access to shared parking and outdoor space.

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Victorian Triplex With Detached Cottage

315-319 10th Street, San Francisco, CA 94103

$1,725,000

4,576 sqft 0.06 AC lot

Two remodeled units are vacant, while garage space beneath the duplex adds flexible utility.

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Triplex Near Ocean Beach

2416 Palmetto AVE, Pacifica, CA 94044

$1,399,000

3,414 sqft 0.08 AC lot

Well-maintained three-unit property with varied bedroom layouts, attached garage parking, and shared laundry facilities.

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Triplex with Shared Backyard

522 22nd AVE, San Francisco, CA 94121

$1,750,000

3,170 sqft

The unit mix combines two three-bedroom homes with a separate one-bedroom ground-floor apartment.

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Triplex with Private-Entry ADU

90 Peralta Avenue, San Francisco, CA 94110

$1,595,000

1,730 sqft 0.06 AC lot

A private-entry accessory dwelling unit includes a kitchenette and opens to a deck and backyard.

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Classic Triplex Apartment Building

1206 Fulton Street, San Francisco, CA 94117

$2,500,000

2,880 sqft

Three residences provide varied bedroom and bathroom configurations with shared outdoor space and parking.

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Triplex with Attached Garages

430 Pine AVE, Half Moon Bay, CA 94019

$1,300,000

3,834 sqft 0.14 AC lot

Two-level triplex with separate utility metering, dedicated laundry rooms, and parking serving each unit.

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Three-Unit Multifamily Victorian

751 Capp Street, San Francisco, CA 94110

$3,748,000

5,500 sqft

Fully occupied three-unit building with updated kitchens and baths, built in 1900 and configured for large bedroom layouts.

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Triplex With Garage

1196 Quesada Avenue, San Francisco, CA 94124

$1,088,000

3,500 sqft 0.06 AC lot

Three-unit residential property with public utilities, wood and linoleum flooring, and both garage and on-street parking.

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Three-Unit Edwardian Residence

124 Parnassus Avenue, San Francisco, CA 94117

$2,795,000

4,142 sqft 0.08 AC lot

Two updated units are vacant; the third is tenant-occupied.

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Two-Story Triplex with Garage

1294 Guerrero Street, San Francisco, CA 94110

$1,749,000

2,880 sqft 0.04 AC lot

Three-unit configuration includes two one-bedroom residences and one two-bedroom residence.

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San Mateo County, CA Triplexes Market Trends and Statistics

Explore 69 triplexes for sale in San Mateo County, CA, showcased through 69 active listings on our real estate platform. These investment opportunities span a total of 167,586 square feet of properties for sale, with an estimated market value of $147,326,748.

Sale prices for three-family homes in San Mateo County, CA start at $750,000, averaging $2,376,237, and reaching up to $7,850,000 — offering options for a variety of budgets and business needs. Daily updated analytics ensure you stay ahead with the latest data and market trends.

Featured San Mateo County Real Estate Agencies

Realmo connects you with licensed San Mateo County CRE brokers providing property specifications, local market pricing, and commercial transaction underwriting support.

Keller Williams Peninsula Estates

1430 Howard Avenue Burlingame, CA 94010

Phone: 16506273700

www.KWPeninsulaEstates.com

Re/Max Prestigious Properties

2811 14th Ave San Francisco, CA 94127

Phone: 14155643776

prestigiousproperties11.california.remax.com/

Capital Realty Group

1200 Howard Avenue Suite 204 Burlingame, CA 94010

Phone: 16503420373