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

    21 Main St Waltham, MA 02453

    • Retail space
    • 13,755 SF
    • 1.06 lot acres
    OFF-MARKET
    Last Sale
    Oct 15, 2021
    $6,300,000
    Value Estimations
    $6,800,000
    Show details
    Cap Rate Potential
    2.8%
    Retail space
    Location Intelligence
    Property ID
    US38-0462615
    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

    • Retail space

    Property Details for 21 Main St

    Year built
    1997
    Construction
    STEEL FRAME
    Lot size
    1.06 lot acres
    Property size
    13,755 SF
    Property type
    Retail space
    APN
    WALT M:063 B:016 L:0013
    APU
    WALTM063B016L0013

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

      Method
      Estimation
      Statistic approach
      $7,160,000
      ML approach
      $7,085,000

    • Comparable approach

      Method
      Estimation
      Statistic Estimate
      $5,730,000
      Market price range: $1.93M - $5.73M

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

    Location Insight

    • Map
    • Local Demand
    City
    Waltham
    County
    Middlesex
    State
    Massachusetts
    Longitude
    -71.2091
    Latitude
    42.3744
    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
    $92,257
    $1,328,100
    $3,126,600
    $4,454,700
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $790,000
      23,018 SF

      265 Moody St, Unit 273

      RETAIL STORES (PERSONAL SERVICES) • 23,018 SF
      265 Moody St, Waltham, MA 02453-5205
      View Details
    • Value Estimation
      $420,000
      3,740 SF

      5 Turner St

      RETAIL STORES (PERSONAL SERVICES) • 3,740 SF
      5 Turner St, Waltham, MA 02453-8900
      View Details
    • Value Estimation
      $425,000
      6,599 SF

      425 Moody St, Unit 437

      RETAIL STORES (PERSONAL SERVICES) • 6,599 SF
      425 Moody St, Waltham, MA 02453-0401
      View Details
    • Value Estimation
      $915,000
      2,016 SF

      314 Riv St

      RETAIL STORES (PERSONAL SERVICES) • 2,016 SF
      314 Riv St, Waltham, MA 02453-6038
      View Details
    • Value Estimation
      $990,000
      2,495 SF

      275-277 Moody St

      RETAIL STORES (PERSONAL SERVICES) • 2,495 SF
      275-277 Moody St, Waltham, MA 02453
      View Details
    • Value Estimation
      $570,000
      17,293 SF

      389 Moody St, Unit 399

      RETAIL STORES (PERSONAL SERVICES) • 17,293 SF
      389 Moody St, Waltham, MA 02453-0401
      View Details

    Similar Nearby for Sale

    • $2,399,000
      4,585 SF

      Mixed-Use Building Near Moody Street

      Mixed-use property with residential, rooming house, and salon spaces.
      55-57 Crescent St, Waltham, MA 02453
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    • $5,000,000
      9,345 SF

      Retail Building For Sale

      9,345 SF retail building suitable for various businesses.
      210 Moody St, Waltham, MA 02453
      View Details
    • Contact for pricing
      24,000 SF

      Moody Street Mixed-Use Opportunity

      Waltham, MA: 24,000 SF, 42 Units, Redevelopment Site
      210 Moody St, Waltham, MA 02453
      View Details
    • $699,000
      0.39 Acres

      42 Felton St, Waltham, MA 02453

      Commercial real estate • 0.39 Acres
      42 Felton St, Waltham, MA 02453
      View Details
    • $3,200,000
      13,954 SF

      Industrial Building with Warehouse Space

      Large commercial building with warehouse, manufacturing, and office space.
      30 Clematis Ave, Waltham, MA 02453
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    • Contact for pricing

      Vacant Wooded Lot For Development

      Vacant wooded lot with Charles River views, ready for development.
      67 Crescent St, Waltham, MA 02453
      View Details

    Similar Nearby for Lease

    • $1,500 /Mo

      Prime Retail Space in Waltham

      Commercial retail space for lease in central Waltham location.
      75-83 Prospect St, Waltham, MA 02453
      View Details
    • $4,400 /Mo

      Restaurant/Retail Space on Moody Street

      Prime restaurant or retail space in downtown Waltham.
      475 Moody St, Waltham, MA 02453
      View Details
    • $2,000 /Mo

      Retail Space Near Brandeis University

      In-line retail space near Brandeis University available for rent.
      Waltham, MA 02453
      View Details
    • Contact for pricing
      2,772 SF

      Retail Space in Waltham Center

      Located in the heart of Waltham, ideal for retailers.
      237 Moody St, Waltham, MA 02453
      View Details
    • $25 SF/Yr

      Retail Space in Colonial Center

      Retail space in busy shopping center with strong tenant mix.
      85 River St, Waltham, MA 02453
      View Details
    • $30 SF/Yr
      1,944 SF

      Restaurant Space in Central Waltham

      Restaurant leasing opportunity with high visibility and ample parking.
      653-663 Main St, Waltham, MA 02453
      View Details
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    21 Main St
    Waltham, MA 02453
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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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