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    Property profile & analytics

    443 Congress St Portland, ME 04101

    • Office buildings
    • 48,768 SF
    • 0.20 lot acres
    For Lease
    View listing
    $14 SF/Yr
    Value Estimations
    Cap Rate Potential
    Location Intelligence
    Property ID
    US42-0385766
    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

    • Planned Parenthood - Portland Health Center / Abortion Clinic / Family Planning Center
    • One & Two Monument Square / Office Space Rental Agency / Business Center
    • Anna Mead / Nurse Practitioner
    • BRONWEN BERLEKAMP O'WRIL / Nurse Practitioner
    • Lumber State Awning Solutions / Contractor

    Property Details for 443 Congress St

    Year built
    1923
    Lot size
    0.20 lot acres
    Property size
    48,768 SF
    Property type
    Office buildings
    APN
    PTLD M:027 B:B002001
    APU
    PTLDM027BB002001

    Description

    This exceptional commercial property at 443 Congress Street in Portland, Maine offers a unique opportunity for businesses seeking executive office space. Located in the heart of the city's vibrant downtown, this multi-tenant building boasts a total of 48,768 square feet, with 5,280 square feet currently available for lease. The space is ideally suited for businesses requiring a prominent address and ample room for operations. The building's B3 - Downtown Business zoning allows for a wide range of commercial uses. The property's address is 443 Congress Street, Portland, ME 04101, within Cumberland County. The property features a convenient location, easily accessible to major transportation routes and amenities. The available space presents a blank canvas for customization, allowing tenants to design their ideal workspace. With its strategic location and substantial square footage, this property represents a compelling investment opportunity for businesses seeking to establish or expand their presence in Portland's thriving commercial district. The property's APN is 027 B002. This is a retail and office space, currently configured as multiple tenancies. The available space totals 5,280 square feet. This is an excellent opportunity to secure a prominent location in a bustling downtown area.

    Value Estimations

    based on Realmo’s proprietary methodology

    • Comparable approach

      Method
      Estimation
      Statistic Estimate
      $7,125,000
      Market price range: $6.28M - $12.4M

    • Alternative Use

      Use
      Estimation
      OFFICE BUILDING
      $8,945,000
      Current use
      INDUSTRIAL (GENERAL)
      $7,305,000
      Change: -18% Conversion: Difficult

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

    Location Insight

    • Map
    • Local Demand
    City
    Portland
    County
    Cumberland
    State
    Maine
    Longitude
    -70.2588
    Latitude
    43.658
    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
    $84,320
    $738,100
    $5,113,400
    $5,851,500
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $1,675,000
      13,058 SF

      1 Dana St

      OFFICE BUILDING • 13,058 SF
      1 Dana St, Portland, ME 04101-5107
      View Details
    • Value Estimation
      $8,910,000
      87,648 SF

      20 Danforth St

      OFFICE BUILDING • 87,648 SF
      20 Danforth St, Portland, ME 04101-4502
      View Details
    • Value Estimation
      $1,760,000
      15,922 SF

      10 Danforth St

      OFFICE BUILDING • 15,922 SF
      10 Danforth St, Portland, ME 04101-4567
      View Details
    • Value Estimation
      $13,315,000
      109,416 SF

      280 Fore St

      OFFICE BUILDING • 109,416 SF
      280 Fore St, Portland, ME 04101-4177
      View Details
    • Value Estimation
      $1,900,000
      14,767 SF

      495 Frst Ave

      OFFICE BUILDING • 14,767 SF
      495 Frst Ave, Portland, ME 04101-1503
      View Details
    • Value Estimation
      $2,600,000
      21,705 SF

      470 Frst Ave

      OFFICE BUILDING • 21,705 SF
      470 Frst Ave, Portland, ME 04101-2009
      View Details

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    • Contact for pricing
      1.29 Acres

      Portland Tech Park Land Sale

      Prime Maine commercial land, I-95 access.
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    • $2,165,000
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      Mixed-Use Building in Downtown Portland

      16,380± SF mixed-use building in the heart of downtown.
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      Net Leased Investment Property

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    Similar Nearby for Lease

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      High-profile Class A office space in downtown Portland for lease.
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      Prime West Bayside Retail Space

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      Prime Old Port Office Space

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      View Details
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    443 Congress 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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