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    Sonoma Mixed-Use Investment Opportunity Title is generated by Realmo AI

    645 Broadway, Sonoma, CA 95476

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    Claim this Listing
    For Sale
    $3,610,000

    Two mixed-use buildings in Sonoma with value-add potential.

    Type:Office
    Property size:
    14,746 SF
    Price / SF:
    $244/SF
    Added:
    Apr 3, 2026
    Days on Market:
    67
    Last Refresh:
    Apr 3 at 5:24 am

    Property Features for 645 Broadway

    General Information

    Standard status
    Active
    Size
    14,746 SF
    Property subtype
    Office

    Building Details

    Year Built
    1928

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    Listing Contact
    Quentin Caruso
    Quentin Caruso

    Listing agent Quentin Caruso License #CA: 02074286

    Listing office San Francisco Office

    Listing date Apr 3, 2026

    Source Marcusmillichap

    Displayed information is deemed reliable but is not guaranteed and should be independently verified.

    All listing content including descriptions, pricing, images are the copyrighted material of San Francisco Office

    HighLights

    • Mixed‑use asset with upside potential through lease‑up and effective management.
    • Two buildings on a single parcel in a high‑traffic location in Sonoma, CA.
    • Opportunity to create two separate parcels via lot line adjustment for individual sale.
    • 10 Maple Street (built 2007): Modern office building with solar panels, ADA‑compliant elevator, and high‑end finishes.
    • 641‑651 Broadway Street (built 1928): Historically significant building with Wine Country charm and a park‑like setting.
    • Ample parking with 39 on‑site spaces plus on‑street parking.

    Overview

    This offering features two mixed-use buildings on a single parcel in Sonoma, California. The properties are located on a highly traveled arterial. Built in 2007, 10 Maple Street is a three-story office property with approximately 9,982 square feet of gross leasable area and an estimated total gross square footage of 12,930 square feet. Each floor has separate electricity meters supported by roof-mounted solar panels. The entry lobby features a soaring ceiling with a chandelier. An ADA-compliant glass-walled elevator provides streetscape views. There are multiple ADA-compliant common area restrooms on each floor. The property includes 39 on-site parking spaces, augmented by ample on-street parking. Ingress and egress are convenient via two double-wide curb cuts onto Maple Street and First Street. The sister property at 641-651 Broadway Street, constructed in 1928, has a vintage Wine Country cottage aesthetic. It is located on the corner of Broadway and Maple Streets. The improvements are predominantly single-story with a small partial second level. The estimated gross leasable area is 4,734 square feet, with additional common areas of approximately 156 square feet on the upper level and 645 square feet on the ground level, for a total approximate gross building area of 5,535 square feet. A large tree encircled by bench seating dominates the Broadway Street façade and yard area. The total property size is 14746 square feet. A lot-line adjustment will create two separate parcels.

    Local Financial Insights For Office B

    Simulate Cap Rate and NOI

    NOI Build-Up
    Vacancy
    income lost from leasable area expected to sit empty during the year — subtracted from gross rent.
    EGI (Effective Gross Income)
    gross rent minus vacancy losses — the realistic income before paying operating costs.
    OpEx (Operating Expenses)
    recurring costs to operate the property (property tax, insurance, utilities, maintenance, management) — excludes financing and capital improvements.
    NOI (Net Operating Income)
    income a property generates after operating costs but before financing and taxes.

    Component $ $/SF
    Gross rent $327.4k $22.20
    − Vacancy −$49.8k −$3.37
    EGI $277.6k $18.83
    − OpEx −$69.4k −$4.71
    NOI $208.2k $14.12
    14,746 SF · lease $22.20/SF/yr · vacancy 15.20% · expense 25.00%

    Alternative Uses

    Best Use
    Office B
    $2.97M
    $2.60M – $3.47M (±1% cap)
    NOI $208,202 @ 7.0% cap · market cap 5.77%
    Second Best
    Mixed Use
    $2.78M
    $2.43M – $3.24M (±1% cap)
    NOI $194,647 @ 7.0% cap · market cap 5.39%
    Theoretical Best
    Specialty Retail
    $4.00M
    $3.50M – $4.66M (±1% cap)
    NOI $279,708 @ 7.0% cap · market cap 7.75%
    Zoning and permitted uses should be independently verified with local authorities.
    Location Intelligence

    Current Use by Public Records

    Office buildings

    Suggested Use

    Law Firm Real Estate Agency Restaurant Spa & Massage Center Dental Office Hair Salon Nail Salon Building Supply Gym & Fitness Center Daycare Center

    Zoning and permitted uses should be independently verified with local authorities.

    Location Insight

    • Map
    • Local Demand
    City
    Sonoma
    County
    Sonoma
    State
    California
    Longitude
    -122.4587255
    Latitude
    38.2893864

    FAQs

    What type of property is this?
    Mixed-use property - Two mixed-use buildings in Sonoma with value-add potential.
    Where is this mixed-use property located?
    The property is located at 645 Broadway Sonoma, CA.
    What is the asking price?
    The asking price for this property is $3,610,000.
    What are key features of this property?
    This property features: Mixed‑use asset with upside potential through lease‑up and effective management.; Two buildings on a single parcel in a high‑traffic location in Sonoma, CA.; Opportunity to create two separate parcels via lot line adjustment for individual sale.
    More about this property
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