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    1 Firefly Street unit 403/103 Portland, ME 04101

    View on Map
    For Sale
    $679,998

    MULTI_FAMILY - Contemporary - Portland, ME

    Property size:
    965 SF
    Lot size:
    4.04 Acres
    Added:
    Nov 19, 2025
    Days on Market:
    135
    Last Refresh:
    Apr 3 at 3:06 am

    Property Features for 1 Firefly Street unit 403/103

    General Information

    Property type
    Residential Multi Family
    Property subtype
    Other
    Zoning
    RN-1
    Rooms
    Basement, Bathroom 1, Bathroom 2
    Interior features
    Elevator Passenger
    Basement
    Daylight, Finished, Full
    Accessibility
    Accessible Elevator Installed
    Standard status
    Active
    Size
    965 SF
    Lot size
    4.04 Acres

    Taxes and HOA fees

    TaxYear
    2026
    TaxAnnualAmount
    8144

    Utilities

    Sewer type
    Public Sewer
    Heating system
    Heat Pump (Heating)
    Cooling system
    Heat Pump
    Water source
    Public

    Building Details

    Year built
    2026
    Number of units
    2
    Building materials
    Other Exterior, Wood Frame
    Roof type
    Membrane
    Architectural style
    Contemporary

    We can help!

    Listing Contact
    William Van Wickler

    Listing agent William Van Wickler

    Listing office Keller Williams Realty 383 US Route 1 Suite 2, Portland, ME

    Listing date Nov 19, 2025

    MLS# 1643879 Listing URL

    Copyright © 2025 Maine Real Estate Information System, Inc. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    Overview

    Two-Unit Condo in Portland, ME

    This is a two-unit property located in the Stroudwater Commons condo community in Portland, ME. It features a three-bedroom, one-bathroom condo with 656 square feet and a detached accessory dwelling unit (ADU) with 353 square feet, totaling 965 square feet. The ADU can function as a studio apartment for short-term or long-term rental income, a guest suite, or for multi-generational living. Both residences offer open spaces, modern kitchens, stylish baths, in-unit laundry, and heat pumps. Elevator access is available to all levels. Parking is available for purchase. Community amenities include a fitness center, co-working lounge, bike storage, EV charging provisions, and direct access to Portland Trails. The Congress Street location provides convenient access to downtown Portland, I-295, I-95, Stroudwater Park, Fore River, USM, Rock Row, and the Jetport. Estimated occupancy is Fall 2026. The property is zoned RN-1 and situated on a 4.04-acre lot.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Duplexes

    Map

    City
    Portland
    County
    Cumberland
    State
    Maine
    Longitude
    -70.2592
    Latitude
    43.6616

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    FAQs

    What type of property is this?
    Duplex - Two-unit condo with versatile layout, ideal for rental income.
    Where is this duplex located?
    The property is located at 1 Firefly Street unit 403/103 Portland, ME.
    What is the asking price?
    The asking price for this property is $679,998.
    What are key features of this property?
    This property features: Two units (3‑bed condo and detached ADU) offer versatile living options and income potential.; Enjoy **modern amenities** including sleek kitchens, stylish baths, in‑unit laundry, and efficient heat pumps.; Access to community amenities: fitness center, co‑working lounge, bike storage, EV charging, and Portland Trails access.
    (207) 232-8877
    We can help!
    Listing Contact
    William Van Wickler
    Learn More
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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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