Add Listing
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

    3878 21st St, Unit 3880 San Francisco, CA 94114-2803

    • Residential income homes
    • 3,315 SF
    • 0.06 lot acres
    OFF-MARKET
    Value Estimations
    $1,140,000
    Show details
    Cap Rate Potential
    Location Intelligence
    Property ID
    US09-5771216
    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

    • Residential income homes

    Property Details for 3878 21st St

    Year built
    1909
    Construction
    WOOD
    Lot size
    0.06 lot acres
    Property size
    3,315 SF
    Zone code
    RH2
    Property type
    Residential income homes
    Property subtype
    Small apartment buildings
    APN
    3603 -024
    APU
    3603024

    Value Estimations

    based on Realmo’s proprietary methodology

    • Alternative Use

      Use
      Estimation
      APARTMENT HOUSE (5+ UNITS)
      $1,365,000
      Current use
      RETAIL STORES
      $1,690,000
      Change: +24% Conversion: Difficult
      OFFICE BUILDING
      $1,590,000
      Change: +16% Conversion: Moderate
      COMMERCIAL (GENERAL)
      $1,490,000
      Change: +9% Conversion: Moderate

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

    Location Insight

    • Map
    • Local Demand
    City
    San Francisco
    County
    San Francisco
    State
    California
    Longitude
    -122.434
    Latitude
    37.7562
    CBSA code
    41860
    CBSA name
    SAN FRANCISCO-OAKLAND-FREMONT, 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
    $23,775
    $1,140,000
    $760,000
    $1,900,000
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $1,205,000
      3,613 SF

      171 Clipper St, Unit 173

      APARTMENT HOUSE (UNDER 5 UNITS) • 3,613 SF
      171 Clipper St, San Francisco, CA 94114-3816
      View Details
    • Value Estimation
      $915,000
      2,800 SF

      297 Corbett Ave, Unit 299

      APARTMENT HOUSE (UNDER 5 UNITS) • 2,800 SF
      297 Corbett Ave, San Francisco, CA 94114-1842
      View Details
    • Value Estimation
      $1,530,000
      4,550 SF

      109 Douglass St

      APARTMENT HOUSE (UNDER 5 UNITS) • 4,550 SF
      109 Douglass St, San Francisco, CA 94114-1920
      View Details
    • Value Estimation
      $930,000
      2,700 SF

      742 Castro St

      APARTMENT HOUSE (UNDER 5 UNITS) • 2,700 SF
      742 Castro St, San Francisco, CA 94114-2834
      View Details
    • Value Estimation
      $1,065,000
      3,620 SF

      1238 Castro St, Unit 1244

      APARTMENT HOUSE (UNDER 5 UNITS) • 3,620 SF
      1238 Castro St, San Francisco, CA 94114-3232
      View Details
    • Value Estimation
      $1,350,000
      3,985 SF

      271 Castro St, Unit 273

      APARTMENT HOUSE (UNDER 5 UNITS) • 3,985 SF
      271 Castro St, San Francisco, CA 94114-1559
      View Details

    Similar Nearby for Sale

    • Contact for pricing
      4,623 SF

      Noe Valley Multifamily Investment

      Well-maintained 6-unit apartment building in prime Noe Valley location.
      252 Chattanooga St, San Francisco, CA 94114
      View Details
    • $2,700,000
      6,536 SF

      Duboce Triangle Five-Unit Property

      Five-unit property in Duboce Triangle near Market Street.
      144 Sanchez St, San Francisco, CA 94114
      View Details
    • $2,780,000
      7,195 SF

      San Francisco Mixed-Use Investment

      Mixed-use property in vibrant Duboce Triangle neighborhood.
      736 14Th St, San Francisco, CA 94114
      View Details
    • Contact for pricing
      1,986 SF

      Eureka Valley Mixed-Use Property

      Mixed-use property in the heart of the Castro District.
      323 Noe St, San Francisco, CA 94114
      View Details
    • Contact for pricing

      Noe Valley Development Opportunity

      Prime mixed-use parcel in Noe Valley's 24th Street corridor.
      4076 24Th St, San Francisco, CA 94114
      View Details
    • Contact for pricing
      3,000 SF

      Castro District Mixed-Use Investment

      Two buildings in the Castro District with commercial and residential spaces.
      327 Noe St, San Francisco, CA 94114
      View Details

    Similar Nearby for Lease

    • Contact for pricing
      2,400 SF

      Prime Noe Valley Retail Space

      Retail space with open layout next to Whole Foods Market.
      3930-3938 24Th St, San Francisco, CA 94114
      View Details
    • Contact for pricing

      Market Street Commercial Space Available

      Commercial space for lease at 2099 Market Street.
      2099 Market St, San Francisco, CA 94114
      View Details
    • Contact for pricing
      14,114 SF

      Prime Corner Retail Space Available

      High-visibility retail space with parking in vibrant Castro neighborhood.
      2390 Market St, San Francisco, CA 94114
      View Details
    • $4,850 /Mo

      Noe Valley Office Space

      Office space in Noe Valley Commercial District, approximately 1,290 square feet.
      3972 24Th St, San Francisco, CA 94114
      View Details
    • Contact for pricing
      800 SF

      Retail Space Near School

      Retail space in high-traffic neighborhood near Saint Philip’s School.
      690 Elizabeth St, San Francisco, CA 94114
      View Details
    • Contact for pricing
      758 SF

      Retail Space at Church & Market

      Retail space in prominent location suitable for retail or service.
      2109-2111 Market St, San Francisco, CA 94114
      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.
    3878 21st St, Unit 3880
    San Francisco, CA 94114-2803
    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.
    Sign Up Successful!
    You now have access to more from Realmo!