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    Property profile & analytics

    21 Main St Rochester, NH 03867-2703

    • Office buildings
    • 3,793 SF
    • 0.22 lot acres
    OFF-MARKET
    Value Estimations
    $295,000
    Show details
    Cap Rate Potential
    Location Intelligence
    Property ID
    US58-0166514
    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

    • Renaissance Signs / Sign Shop
    • The Law Offices Of Stephen C. Brown & Associates / Attorney / Criminal Justice Attorney
    • The Law Offices of Stephen C. Brown & Associates / Personal Injury Attorney / Criminal Justice Attorney

    Property Details for 21 Main St

    Year built
    1950
    Construction
    MASONRY/CONCRETE MASONRY UNITS (CMUS)
    Lot size
    0.22 lot acres
    Property size
    3,793 SF
    Zone code
    DTC
    Property type
    Office buildings
    APN
    RCHE M:0120 B:0354 L:0000
    APU
    RCHEM0120B0354L0000

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

      Method
      Estimation
      ML approach
      $290,000

    • Comparable approach

      Method
      Estimation
      AI Estimate
      $383,000
      Market price range: $255k - $557k

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

    Location Insight

    • Map
    • Local Demand
    City
    Rochester
    County
    Strafford
    State
    New Hampshire
    Longitude
    -70.9758
    Latitude
    43.3035
    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
    2023
    $6,875
    $85,800
    $181,300
    $267,100
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $300,000
      2,042 SF

      73 Wakefield St

      OFFICE BUILDING • 2,042 SF
      73 Wakefield St, Rochester, NH 03867-1920
      View Details
    • Value Estimation
      $880,000
      8,840 SF

      90 Main St

      OFFICE BUILDING • 8,840 SF
      90 Main St, Rochester, NH 03867-2701
      View Details
    • Value Estimation
      $425,000
      5,724 SF

      40 Wakefield St

      OFFICE BUILDING • 5,724 SF
      40 Wakefield St, Rochester, NH 03867-1929
      View Details
    • Value Estimation
      $335,000
      9,701 SF

      57 Wakefield St

      OFFICE BUILDING • 9,701 SF
      57 Wakefield St, Rochester, NH 03867-1918
      View Details
    • Value Estimation
      $400,000
      12,385 SF

      664 Columbus Ave

      OFFICE BUILDING • 12,385 SF
      664 Columbus Ave, Rochester, NH 03867-3496
      View Details
    • Value Estimation
      $285,000
      2,975 SF

      168 Main St

      OFFICE BUILDING • 2,975 SF
      168 Main St, Rochester, NH 03867-1219
      View Details

    Similar Nearby for Sale

    • Contact for pricing
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      6,862 SF two-story building with drive-thru and parking.
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      Historic Office Building For Sale

      Second Empire-style office building in downtown Rochester, New Hampshire.
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    • $110,000
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      Rochester Medical/Office Condo For Sale

      1,515+ SF medical/office condo near Frisbie Memorial Hospital.
      161 Rochester Hill Rd, Rochester, NH 03867
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      Rochester Office Condo For Sale

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      60 Rochester Hill Rd, Rochester, NH 03867
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    • $120,000

      Professional Office Condominium For Sale

      Well-designed office condo with renovated reception and ample parking.
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    • $1,300,000

      Modern Medical Facility For Sale

      Class A medical building in a campus setting.
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    Similar Nearby for Lease

    • $9 SF/Yr

      Rochester Flex, R&D, and Lab

      Office, flex, R&D, and lab leasing options available.
      35E Industrial Way, Rochester, NH 03867
      View Details
    • $9 SF/Yr

      Rochester Office, Flex, R&D, Lab

      Professional office, flex, R&D, and lab leasing options available.
      35E Industrial Way Entire, Rochester, NH 03867
      View Details
    • $16 SF/Yr
      1,034 SF

      New Retail/Office Space Available

      New construction retail/office space on busy North Main Street.
      47-55 North Main St, Rochester, NH 03867
      View Details
    • $22 SF/Yr
      22,333 SF

      Rochester Medical Office Space

      Prime Medical Office Suites Available
      21 Whitehall Rd, Rochester, NH 03867
      View Details
    • $9 SF/Yr
      210,000 SF

      Rochester Executive Office Suites

      Premium NH Office Space Available
      35 Industrial Way, Rochester, NH 03867
      View Details
    • $9 SF/Yr

      Rochester Office, Flex, R&D, Lab

      Professional office, flex, R&D, and lab leasing options available.
      35 Industrial Way Entire, Rochester, NH 03867
      View Details
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    21 Main St
    Rochester, NH 03867-2703
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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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