Sign Up Successful!
You now have access to more from Realmo!
Property Lookup
    Property Lookup
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    AI Search
    Back to Search
    The Largest CRE Database in the US with Over 1 Million Listings
    Property profile & analytics

    645 1st St W Ste A Sonoma, CA 95476-7044

    • Office Properties & Spaces
    • 587 SF
    • 0.10 lot acres
    OFF-MARKET
    Value Estimations
    $285,000
    Show details
    Cap Rate Potential
    3%
    Office Properties & Spaces
    Location Intelligence
    Property ID
    US09-2691955
    The Realmo ID is a unique identifier assigned to every property, incorporating country codes and precise geo-coordinates for 300x300-foot land blocks. It enables standardized data collection and seamless integration of disparate sources such as ownership, tax, title data and physical specifications. By aggregating current and historical records, the Realmo ID powers advanced analytics and delivers deep, verifiable insights for real estate professionals.

    Current Use by Public Records

    • Office Properties & Spaces

    Property Details for 645 1st St W Ste A

    Year built
    2005
    Lot size
    0.10 lot acres
    Property size
    587 SF
    Property type
    Office Properties & Spaces
    APN
    018-850-016-000
    APU
    18850016000

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

      Method
      Estimation
      ML approach
      $300,000

    • Comparable approach

      Method
      Estimation
      Statistic Estimate
      $270,000
      Market price range: $160k - $352k

    • Alternative Use

      Use
      Estimation
      OFFICE BUILDING
      $270,000
      Current use
      COMMERCIAL (GENERAL)
      $360,000
      Change: +34% Conversion: Easy

    Get a detailed, property-specific valuation — fast and free

    Location Insight

    • Map
    • Local Demand
    City
    Sonoma
    County
    Sonoma
    State
    California
    Longitude
    -122.459
    Latitude
    38.2898
    CBSA code
    42220
    CBSA name
    SANTA ROSA-PETALUMA, CA METROPOLITAN STATISTICAL AREA

    Property Tax & Assessments

    Tax date
    Tax Amount
    Assessed Land Value
    Assessed Improvement Value
    Total Assessed Value
    Applied Tax Rate
    Land Market Value
    Improvement Market Value
    Total Market Value
    2024
    $2,717
    $108,649
    $86,918
    $195,567
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation by Request
      4,400 SF

      17905 Sonoma Hwy

      Life science properties • 4,400 SF
      17905 Sonoma Hwy, Sonoma, CA 95476
      View Details
    • Value Estimation
      $245,000
      906 SF

      181 Andrieux St Ste, Unit 200

      CONDOMINIUM OFFICES • 906 SF
      181 Andrieux St Ste, Sonoma, CA 95476-6920
      View Details
    • Value Estimation by Request

      1777 Watmaugh Rd

      Office space
      1777 Watmaugh Rd, Sonoma, CA 95476
      View Details
    • Value Estimation
      $455,000
      1,254 SF

      368 Perkins St

      CONDOMINIUM OFFICES • 1,254 SF
      368 Perkins St, Sonoma, CA 95476-6827
      View Details
    • Value Estimation
      $825,000
      1,433 SF

      1254 Broadway A Ste A

      CONDOMINIUM OFFICES • 1,433 SF
      1254 Broadway A Ste A, Sonoma, CA 95476-7586
      View Details
    • Value Estimation
      $55,000
      1,132 SF

      181 Andrieux St Ste, Unit 100

      CONDOMINIUM OFFICES • 1,132 SF
      181 Andrieux St Ste, Sonoma, CA 95476-6920
      View Details

    Similar Nearby for Sale

    • $199,000
      4,400 SF

      Sonoma Hwy Commercial Redevelopment

      4,400 SF Vacant Land, High Traffic
      17905 Sonoma Hwy, Sonoma, CA 95476
      View Details
    • $1,400,000

      Sonoma Office Space For Sale

      Office property available for purchase in Sonoma, California.
      635 Broadway, Sonoma, CA 95476
      View Details
    • $4,000,000
      11,032 SF

      Sonoma Office Building Investment

      Class A Office, High NOI, 6.19% Cap Rate
      19080 Lomita Ave, Sonoma, CA 95476
      View Details
    • $4,000,000
      0.39 Acres

      Sonoma Office Building: Prime Location

      Iconic Sonoma Plaza, 11,000+ sq ft office.
      19080 Lomita Ave, Sonoma, CA 95476
      View Details
    • $1,150,000
      1,333 SF

      Renovated Office Building Near Plaza

      Restored 1930 Sonoma office building near historic plaza.
      369 W Napa St, Sonoma, CA 95476
      View Details
    • $1,280,000

      Sonoma Office Building For Sale

      Office building available for purchase in Sonoma, California.
      454 W Napa St, Sonoma, CA 95476
      View Details

    Similar Nearby for Lease

    • $24 SF/Yr
      1,696 SF

      Sonoma Hwy Executive Office Suite

      Prime Sonoma location, 1696 sq ft office.
      17977 Sonoma Hwy, Sonoma, CA 95476
      View Details
    • $3 SF/Yr
      12,997 SF

      Sonoma Office Space For Rent

      Demised office space within walking distance to Sonoma Plaza.
      579 1St St, Sonoma, CA 95476
      View Details
    • $3,000 /Mo
      4,922 SF

      Sonoma Office with Live/Work Potential

      Well-maintained office building with live/work potential, great visibility, high traffic.
      17977 Hwy 12, Sonoma, CA 95476
      View Details
    • $31 SF/Yr
      11,032 SF

      Sonoma Office Building For Sale

      Prime Sonoma location, versatile office space
      19080 Lomita Ave, Sonoma, CA 95476
      View Details
    • $6,000 /Mo
      9,107 SF

      Executive Office Sonoma, CA

      Office space • 9,107 SF
      18506 Sonoma Ca 95476, Sonoma, CA 95476
      View Details
    • Contact for pricing
      11,310 SF

      Sonoma Industrial Warehouse For Lease

      11,310 SF Warehouse, 7.17 Acres
      24200 Arnold Dr, Sonoma, CA 95476
      View Details
    Request Owner's contact information
    Message sent successfully
    Error
    If you are the owner or broker of this property and would like to edit or remove this listing please send a message to web site administrator.
    645 1st St W Ste A
    Sonoma, CA 95476-7044
    Message sent successfully
    Error
    Email to Your Friends
    Link copied to clipboard
    Separate multiple addresses with a comma
    Message sent successfully
    Error

    Realmo Value Estimations

    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.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    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.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    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
    Thanks! Your message was sent.
    Error! Your message wasn't sent.
    Please enter your name
    Please enter email
    Please enter the email in the correct format
    Please enter phone
    Please enter the number in the correct format
    Please enter message
    Thank You

    You are Unsubscribed From Notifications

    Google sign-in failed. Please try again or use another login method.
    Create New Password
    • At least 8 characters
    • Contains both letters and numbers
    • Contains uppercase and lowercase letters
    • At most 32 characters
    • Password required
    • Password reset link has expired. Please request a new one.