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    The Largest CRE Database in the US with Over 1 Million Listings
    Property profile & analytics

    21 Longwood Ave Brookline, MA 02446-5239

    • Office buildings
    • 8,379 SF
    • 0.29 lot acres
    OFF-MARKET
    Value Estimations
    $2,880,000
    Show details
    Cap Rate Potential
    Location Intelligence
    Property ID
    US38-0618090
    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

    • Brookline Dental Specialists / Cosmetic Dentist / Dental Clinic
    • Dr. Wilfred S. Mamuya, MD / Cardiologist
    • Dr. Amirali Fattahi / Dentist / Practitioner Service Location
    • Dr. Mariam Ghavamian / Dentist / Practitioner Service Location
    • Mary Ghattas / Pediatric Dentist / Dentist

    Property Details for 21 Longwood Ave

    Year built
    1955
    Construction
    CONCRETE
    Lot size
    0.29 lot acres
    Property size
    8,379 SF
    Zone code
    G175
    Property type
    Office buildings
    APN
    BROO B:158 L:0011 S:0000
    APU
    BROOB158L0011S0000

    Value Estimations

    based on Realmo’s proprietary methodology

    • CAP approach

      CAP Return
      Estimation
      6%
      $3,270,000
      6.5%
      $3,015,000
      7%
      $2,800,000

    • Comparable approach

      Method
      Estimation
      AI Estimate
      $2,961,000
      Market price range: $1.62M - $5.10M

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

    Location Insight

    • Map
    • Local Demand
    City
    Brookline
    County
    Norfolk
    State
    Massachusetts
    Longitude
    -71.1199
    Latitude
    42.341
    CBSA code
    14460
    CBSA name
    BOSTON-CAMBRIDGE-QUINCY, MA-NH 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
    $75,670
    $2,191,700
    $2,419,500
    $4,611,200
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $1,715,000
      4,970 SF

      1577 Beacon St

      OFFICE BUILDING • 4,970 SF
      1577 Beacon St, Brookline, MA 02446-4602
      View Details
    • Value Estimation
      $2,080,000
      5,876 SF

      1018 Beacon St

      OFFICE BUILDING • 5,876 SF
      1018 Beacon St, Brookline, MA 02446-4084
      View Details
    • Value Estimation
      $8,340,000
      5,069 SF

      45 Bartlett Cres

      OFFICE BUILDING • 5,069 SF
      45 Bartlett Cres, Brookline, MA 02446-2220
      View Details
    • Value Estimation
      $2,010,000
      5,423 SF

      209 Babcock St

      OFFICE BUILDING • 5,423 SF
      209 Babcock St, Brookline, MA 02446-6773
      View Details
    • Value Estimation
      $4,915,000
      18,699 SF

      115 Dummer St

      OFFICE BUILDING • 18,699 SF
      115 Dummer St, Brookline, MA 02446-3628
      View Details
    • Value Estimation
      $1,070,000
      2,330 SF

      1423-1425 Beacon St

      OFFICE BUILDING • 2,330 SF
      1423-1425 Beacon St, Brookline, MA 02446
      View Details

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      Brookline Multifamily Investment Opportunity

      Three-unit residential building in prime Brookline location near public transit.
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      0.23 Acres

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      1700 sq ft Flex Space, $4500/month, Triple Net.
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    Similar Nearby for Lease

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      469 SF

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      Medical/office space with immediate Green Line access.
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    • $4,500 /Mo

      Brookline Commercial Flex Space

      Commercial flex space with high visibility and foot traffic.
      2 Summit Ave, Brookline, MA 02446
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    • $35 SF/Yr

      Coolidge Corner Medical/Office Space

      Medical/Office space in Coolidge Corner with public transportation access.
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      513 SF

      Renovated Office Space in Brookline

      Spacious, sunny office with ongoing renovations in Coolidge Corner.
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    • $1.00 SF/Yr

      Washington Square Office Suite

      2,200 SF office suite in prime Brookline location.
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      View Details
    • $1.00 SF/Yr
      1,100 SF

      Brookline Office Space for Rent

      78,000 SF building with convenient location and abundant parking.
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      View Details
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    21 Longwood Ave
    Brookline, MA 02446-5239
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    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
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