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    Two-Unit Residential Income Duplex Title is generated by Realmo AI

    20 Green Street, Biddeford, ME 04005

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    For Sale
    $469,000

    MULTI_FAMILY - Biddeford, ME

    Property size:
    2,144 SF
    Lot size:
    0.11 Acres
    Price / SF:
    $218/SF
    Added:
    Jun 5, 2026
    Days on Market:
    1
    Last Refresh:
    Jun 5 at 9:06 pm

    Property Features for 20 Green Street

    General Information

    Property type
    Residential Multi Family
    Property subtype
    Other
    Zoning
    MSRD2
    Bathrooms
    3
    Rooms
    Basement, Bathroom 3, Bathroom 2, Bathroom 1
    Interior features
    Primary Bedroom w/Bath
    Basement
    Full, Unfinished
    Standard status
    Active
    Size
    2,144 SF
    Lot size
    0.11 Acres

    Taxes and HOA fees

    Tax Year
    2025
    Tax Annual Amount
    5062

    Utilities

    Sewer type
    Public Sewer
    Heating system
    Hot Water(Heating), Forced Air, Oil
    Water source
    Public

    Building Details

    Year built
    1900
    Number of units
    2
    Flooring type
    Laminate, Carpet
    Building materials
    Wood Frame, Vinyl Siding
    Roof type
    Shingle

    We can help!

    Listing Contact
    Erin Oldham Mindy Phillips

    Listing agent Erin Oldham Mindy Phillips

    Listing office Portside Real Estate Group 59 Baxter Blvd., Yarmouth, ME

    Listing date Jun 5, 2026

    MLS# 1665791 Listing URL

    Copyright © 2026 Maine Listings. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    HighLights

    • Two‑unit property with a 3‑bedroom, 2‑bath unit and a 2‑bedroom, 1‑bath unit
    • Large garage offers storage/workshop space and potential commercial use (subject to local approvals)
    • Public water and public sewer
    • Built in 1900 with wood‑frame construction and vinyl siding
    • Heating includes hot water (heating), forced air, and oil heat
    • Roof is shingle; flooring includes laminate and carpet

    Overview

    This two-unit residential duplex provides two separate apartment layouts within a single building. One unit offers three bedrooms and two bathrooms, while the second unit offers two bedrooms and one bathroom. The property also includes a large garage that can support storage and workshop needs, with any alternative commercial use subject to local approvals. The overall property size is listed at 2,144 square feet, situated on an 0.11-acre lot.

    The property is located at 20 Green Street in Biddeford, Maine, in York County. The listing indicates the location is in the heart of Biddeford and is close to downtown restaurants, breweries, shops, and the riverfront.

    For buyers looking for residential income or owner-occupant flexibility, the dual-unit configuration can support a live-in arrangement while maintaining a second rental unit. The presence of a sizable garage adds practical space for storage or workshop use, and offers additional flexibility should the buyer pursue an approved use with the appropriate local review. Zoning is listed as MSRD2.

    Local Financial Insights For Multifamily LT 5

    Simulate Cap Rate and NOI

    NOI Build-Up
    Vacancy
    income lost from leasable area expected to sit empty during the year — subtracted from gross rent.
    EGI (Effective Gross Income)
    gross rent minus vacancy losses — the realistic income before paying operating costs.
    OpEx (Operating Expenses)
    recurring costs to operate the property (property tax, insurance, utilities, maintenance, management) — excludes financing and capital improvements.
    NOI (Net Operating Income)
    income a property generates after operating costs but before financing and taxes.

    Component $ $/SF
    Gross rent $54.5k $25.44
    − Vacancy −$2.7k −$1.26
    EGI $51.8k $24.18
    − OpEx −$15.6k −$7.25
    NOI $36.3k $16.93
    2,144 SF · lease $25.44/SF/yr · vacancy 4.94% · expense 30.00%

    Alternative Uses

    Best Use
    Multifamily LT 5
    $518.5K
    $453.7K – $604.9K (±1% cap)
    NOI $36,294 @ 7.0% cap · market cap 7.74%
    Second Best
    Apartment 5plus
    $473.3K
    $414.2K – $552.2K (±1% cap)
    NOI $33,134 @ 7.0% cap · market cap 7.06%
    Theoretical Best
    Office A
    $679.6K
    $594.7K – $792.9K (±1% cap)
    NOI $47,575 @ 7.0% cap · market cap 10.14%
    Zoning and permitted uses should be independently verified with local authorities.
    Property Profile Location Intelligence

    Current Use by Public Records

    Duplexes

    Suggested Use

    Real Estate Agency Law Firm Restaurant Dental Office Spa & Massage Center Hair Salon Nail Salon Building Supply Daycare Center Gym & Fitness Center

    Zoning and permitted uses should be independently verified with local authorities.

    Location Insight

    • Map
    • Local Demand
    City
    Biddeford
    County
    York
    State
    Maine
    Longitude
    -70.459957
    Latitude
    43.492291

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    FAQs

    What type of property is this?
    Duplex - Two distinct apartments plus a large garage offer flexible living and income options in Biddeford, Maine.
    Where is this duplex located?
    The property is located at 20 Green Street Biddeford, ME.
    What is the asking price?
    The asking price for this property is $469,000.
    What are key features of this property?
    This property features: Two‑unit property with a 3‑bedroom, 2‑bath unit and a 2‑bedroom, 1‑bath unit; Large garage offers storage/workshop space and potential commercial use (subject to local approvals); Public water and public sewer
    (207) 415-6754
    We can help!
    Listing Contact
    Erin Oldham Mindy Phillips
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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.

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