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    55 Sunnyside Ave Mill Valley, CA 94941

    For Lease
    $54 SF/Yr

    Former Mill Valley post office available for lease.

    Property size:
    7,082 SF
    Lot size:
    0.40 Acres

    Property Features for 55 Sunnyside Ave

    General Information

    Size
    7,082 SF
    Lot size
    0.40 Acres

    Source: Cushman & Wakefield | Larkspur Agent Brian Foster

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

    Overview

    Iconic Mill Valley Building For Lease

    Available for the first time in over 30 years, 55 Sunnyside Ave presents a leasing opportunity in one of Mill Valley's iconic buildings. Formerly the Mill Valley post office, this property is situated in the heart of downtown. The location offers the potential to establish a brand presence. The property features vaulted ceilings and natural light. On-site parking is available. The property has a size of 7,082 square feet. The downtown location provides visibility.
    Insight Report Location Intelligence

    Current Use by Public Records

    Office buildings

    Suggested Use

    Law Firm Realty agency Restaurant Spa & Massage Dental Office Hair Salon Nail Salon Clothing Store Building Supply Daycare Center

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

    Location Insight

    • Map
    • Local Demand
    City
    Mill Valley
    County
    Marin
    State
    California
    Longitude
    -122.5452834
    Latitude
    37.9063126

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    FAQs

    What type of property is this?
    Office building - Former Mill Valley post office available for lease.
    Where is this office building located?
    The property is located at 55 Sunnyside Ave Mill Valley, CA.
    What is the lease rate?
    The lease rate is $54 SF/Yr.
    What are key features of this property?
    This property features: - Unparalleled downtown location and visibility in the heart of Mill Valley.; - Rare opportunity to lease an iconic building, available for the first time in 30+ years.; - The former Mill Valley post office, a recognizable and historic landmark.
    (415) 485-0500
    Request Owner's contact information
    55 Sunnyside Ave Mill Valley, CA 94941
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    Mill Valley, CA 94941
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    Realmo Value Estimation

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.

    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.

    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

    More about this property
    55 Sunnyside Ave Mill Valley, CA 94941
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