Castro Valley, CA Duplexes for sale

Updated: Jul 9

Duplex With Detached ADU Cottage

4231 Somerset Ave, Castro Valley, CA 94546

$999,950

1,285 sqft 0.12 AC lot

Main home plus 250‑square‑foot detached studio ADU‑cottage with laundry
3 bedrooms and 1 bathroom in the main residence, plus fenced, private outdoor space
Central air cooling with forced‑air and wall furnace heating
Detached ADU is separately fenced; cottage is currently rented
Remodeled finishes include hardwood, tile, laminate, and carpet flooring

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4231 Somerset Ave, Castro Valley, CA 94546

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Est. Cap Rate

4.3%
NOI ÷ price
Est. NOI

$43K
Annual
Price @ 7% Cap

$616K
Suggested
Property Type

Single Family Residence
Built 1949

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Updated: Jul 24

Duplex with Detached Two-Car Garage

20843 Chester St, Castro Valley, CA 94546

$1,409,800

1,590 sqft 0.26 AC lot

Two‑unit duplex: one 2 bed/1 bath unit plus one 1 bed/1 bath unit
Approximately 1,590 square feet of living area
Lot size approximately 11,084 square feet (0.26 acres)
Detached two‑car garage plus storage improvements
Per Alameda County Planner, potential for up to 5 accessory dwelling units

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Duplex with Central Air and Garage

3675 Christensen Ln, Castro Valley, CA 94546

$1,249,000

2,700 sqft 0.18 AC lot

Duplex featuring central air, garage parking, and fully renovated interiors on one lot.

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Duplex With Detached Two-Car Garage

20843 Chester St, Castro Valley, CA 94546

$1,409,800

1,590 sqft 0.25 AC lot

Two-unit property with landscaped grounds, storage improvements, and access to schools, shops, dining, BART, and public transportation.

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Based on your search, we've compiled 8 Potential Opportunities for your consideration. Besides 4 Active listings in Castro Valley, CA, we suggest exploring several alternatives: 4 properties in Nearby Cities

Opportunities in Nearby Cities

Here are 4 Similar properties we found in Nearby Locations for your consideration.

Duplex with Private Garages

San Leandro, CA 94578

$508,000

1,600 sqft

San Leandro duplex with two tenant-occupied 2BR/1BA units, each with a private enclosed garage and a large shared yard.

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Two-Unit Duplex

987 Simon Street, Hayward, CA 94541

$649,000

1,056 sqft

Separate addresses and individual garages support flexible occupancy arrangements.

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Well-Maintained Duplex Income Property

446 Dolores Ave, San Leandro, CA 94577

$1,388,000

2,770 sqft

Two separate units with individual meters, including a larger rear unit with yard access and a smaller front unit.

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Detached Duplex with Greenhouse

20583 Cambridge Avenue, Hayward, CA 94541

$1,139,000

1,854 sqft 0.42 AC lot

Two detached homes on a flat 18,286 SF lot with separate PG&E meters, detached 1-car garage, and greenhouse.

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Castro Valley, CA Duplexes Market Trends and Statistics

Explore 4 duplexes for sale in Castro Valley, CA, showcased through 4 active listings on our real estate platform. These investment opportunities span a total of 7,165 square feet of properties for sale, with an estimated market value of $5,068,550.

Sale prices for duplexes in Castro Valley, CA start at $999,950, averaging $1,267,137, and reaching up to $1,409,800 — offering options for a variety of budgets and business needs. Daily updated analytics ensure you stay ahead with the latest data and market trends.

Neighborhood	Average Price
94546	$1.2M

Neighborhood

Average Price

94546

$1.2M

Castro Valley, CA Duplexes for Sale

4231 Somerset Ave, Castro Valley, CA 94546

20843 Chester St, Castro Valley, CA 94546

3675 Christensen Ln, Castro Valley, CA 94546

20843 Chester St, Castro Valley, CA 94546