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

    18-20 Main St, Unit 1 Charlestown, MA 02129

    • Office Properties & Spaces
    • 580 SF
    • 0.01 lot acres
    OFF-MARKET
    Value Estimations
    Cap Rate Potential
    Location Intelligence
    Property ID
    US38-1053129
    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 18-20 Main St

    Lot size
    0.01 lot acres
    Property size
    580 SF
    Zone code
    CC
    Property type
    Office Properties & Spaces
    APN
    CHAR W:02 P:03702 S:022
    APU
    CHARW02P03702S022

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

    • CAP approach

    • Comparable approach

    • Alternative Use

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

    Location Insight

    • Map
    • Local Demand
    City
    Charlestown
    County
    Suffolk
    State
    Massachusetts
    Longitude
    -71.0621
    Latitude
    42.3728
    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
    $4,672
    $0.00
    $184,900
    $184,900
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $8,955,000
      31,532 SF

      197 8th St, Unit 1

      CONDOMINIUM OFFICES • 31,532 SF
      197 8th St, Charlestown, MA 02129-4208
      View Details
    • Value Estimation
      $1,290,000
      4,082 SF

      38 3rd Ave Ste 100w

      CONDOMINIUM OFFICES • 4,082 SF
      38 3rd Ave Ste 100w, Charlestown, MA 02129-4503
      View Details
    • Value Estimation
      $2,930,000
      9,611 SF

      38 3rd Ave Ste, Unit 200

      CONDOMINIUM OFFICES • 9,611 SF
      38 3rd Ave Ste, Charlestown, MA 02129-4503
      View Details
    • Value Estimation by Request
      1,045 SF

      121 Main St, Unit 2

      CONDOMINIUM OFFICES • 1,045 SF
      121 Main St, Charlestown, MA 02129-3533
      View Details
    • Value Estimation by Request
      1,472 SF

      3 Shipway Plc3

      CONDOMINIUM OFFICES • 1,472 SF
      3 Shipway Plc3, Charlestown, MA 02129-4301
      View Details
    • Value Estimation by Request
      1,237 SF

      4 Shipway Plc4

      CONDOMINIUM OFFICES • 1,237 SF
      4 Shipway Plc4, Charlestown, MA 02129-4301
      View Details

    Similar Nearby for Sale

    • Contact for pricing
      7,526 SF

      Redevelopment Opportunity Near Sullivan Square

      7,526 SF office space near Sullivan Square MBTA Station.
      Boston, MA 02129
      View Details
    • Contact for pricing
      14,950 SF

      Charlestown Navy Yard Office Building

      Historic 14,950 SF office building in Charlestown Navy Yard.
      120 2Nd Ave, Charlestown, MA 02129
      View Details
    • Contact for pricing
      25,000 SF

      Charlestown Industrial Building for Sale

      25,000 SF industrial building with redevelopment potential in Charlestown.
      62-68 Alford St, Charlestown, MA 02129
      View Details
    • Contact for pricing
      25,000 SF

      Charlestown Industrial Property

      25,000 SF Industrial Building, Boston
      62 Alford St, Boston, MA 02129
      View Details
    • $1,300,000

      Charlestown Multi-Family Investment Opportunity

      Well-maintained three-unit property in historic Charlestown near Bunker Hill.
      339 Bunker Hill St, Boston, MA 02129
      View Details
    • $1,399,000

      Charlestown Gas Light District Opportunity

      Free-standing single-family house with potential for 3-unit conversion.
      1 Washington Pl, Boston, MA 02129
      View Details

    Similar Nearby for Lease

    • $65 SF/Yr
      22,619 SF

      Schrafft's Center Office Suites

      Executive suites, coworking, creative office space.
      529 Main St, Boston, MA 02129
      View Details
    • Contact for pricing
      11,750 SF

      Available Office Space for Rent

      Office space available immediately with flexible lease terms.
      500 Rutherford Ave, Boston, MA 02129
      View Details
    • Contact for pricing
      9,782 SF

      Plug-and-Play Office Sublease

      Beautiful office space with views of the Rose Kennedy Greenway.
      125 High St, Boston, MA 02129
      View Details
    • Contact for pricing
      18,753 SF

      Financial District Office Space Available

      Available office space in Boston's Financial District for rent.
      110 High St, Boston, MA 02129
      View Details
    • $44 SF/Yr
      25,135 SF

      Versatile Commercial Space Available

      Adaptable space with amenities, convenient location, and on-site management.
      465 Medford St, Charlestown, MA 02129
      View Details
    • $38 SF/Yr
      3,500 SF

      Office Space Near Rose Greenway

      Office space for lease, close to waterfront and transportation.
      184 High St, Boston, MA 02129
      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.
    18-20 Main St, Unit 1
    Charlestown, MA 02129
    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.