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    Property profile & analytics

    100 Commercial St Portland, ME 04101

    • Commercial real estate
    • 76,000 SF
    • 0.35 lot acres
    For Lease
    View listing
    $25 SF/Yr
    Value Estimations
    Cap Rate Potential
    Location Intelligence
    Property ID
    US42-0312681
    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

    • Mark Mueller Architects / Architect / Design
    • Maine Boatbuilders Show / Corporate Office
    • Misi Co / IT Consulting Firm / (Bike/Boat/Book/etc) Store
    • Society Mortgage Maine Branch / Loan Service / Bank
    • Martin Defense Group, LLC / Engineering Consultant

    Property Details for 100 Commercial St

    Year built
    1900
    Lot size
    0.35 lot acres
    Property size
    76,000 SF
    Property type
    Commercial real estate
    APN
    PTLD M:030 B:C001001
    APU
    PTLDM030BC001001

    Description

    This exceptional commercial property, located at 100 Commercial Street in Portland, Maine, offers 61,657 square feet of prime office space. The building, constructed in 1900, is a four-story structure situated on a 0.349-acre lot. Its classic architecture blends seamlessly with the vibrant downtown environment. The property is zoned B3 Downtown Business District & PAD Pedestrian Activity Overlay, providing flexibility for a variety of commercial uses. The building features one passenger elevator, serving all four floors, and boasts 100 amp electrical service. The property is designated as a Traditional Office building and also offers Executive Office suites, making it suitable for a range of business needs. Multiple tenancies are currently in place. The property's address is 100 Commercial Street, Portland, ME 04101, and its location within Cumberland County offers excellent access to transportation and amenities. The Assessor's Parcel Number (APN) is Map 30, Block C, Lots 1-8. This is a rare opportunity to acquire a substantial and well-located office building in the heart of Portland.

    Value Estimations

    based on Realmo’s proprietary methodology

    • Comparable approach

      Method
      Estimation
      AI Estimate
      $6,346,000
      Market price range: $2.68M - $11.4M

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

    Location Insight

    • Map
    • Local Demand
    City
    Portland
    County
    Cumberland
    State
    Maine
    Longitude
    -70.2513
    Latitude
    43.6563
    CBSA code
    38860
    CBSA name
    PORTLAND-SOUTH PORTLAND-BIDDEFORD, ME 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
    $170,005
    $1,201,800
    $10,595,900
    $11,797,700
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation by Request
      12,847 SF

      3 Commercial St

      Individual retail properties • 12,847 SF
      3 Commercial St, Portland, ME 04101
      View Details
    • Value Estimation by Request
      95,000 SF

      254 Commercial St

      Specialty properties • 95,000 SF
      254 Commercial St, Portland, ME 04101
      View Details
    • Value Estimation by Request
      0.82 Acres

      100 Middle St

      COMMERCIAL (GENERAL) • 0.82 Acres
      100 Middle St, Portland, ME 04101-4100
      View Details
    • Value Estimation by Request
      0.23 Acres

      76 Portland St

      COMMERCIAL (GENERAL) • 0.23 Acres
      76 Portland St, Portland, ME 04101-2828
      View Details
    • Value Estimation
      $2,135,000
      19,569 SF

      10 Exchange St Ste, Unit 100

      COMMERCIAL CONDOMINUIM • 19,569 SF
      10 Exchange St Ste, Portland, ME 04101-5043
      View Details
    • Value Estimation
      $3,075,000
      27,955 SF

      540 Congress St, Unit 2

      COMMERCIAL CONDOMINUIM • 27,955 SF
      540 Congress St, Portland, ME 04101-3362
      View Details

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    100 Commercial St
    Portland, ME 04101
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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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