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    Castine Mixed-Use Investment Opportunity Title is generated by Realmo AI

    3 Main Street, Castine, ME 04421

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    Claim this Listing
    For Sale
    $1,495,000

    COMMERCIAL - Castine, ME

    Property size:
    5,000 SF
    Lot size:
    0.10 Acres
    Price / SF:
    $299/SF
    Added:
    Jan 7, 2026
    Days on Market:
    128
    Last Refresh:
    May 15 at 7:06 pm

    Property Features for 3 Main Street

    General Information

    Property type
    Commercial Sale
    Property subtype
    Other
    Zoning
    Commercial
    Rooms
    Basement
    Basement
    Unfinished, Partial
    Standard status
    Active
    Size
    5,000 SF
    Lot size
    0.10 Acres

    Taxes and HOA fees

    Tax Year
    2023
    Tax Annual Amount
    4451

    Utilities

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

    Building Details

    Flooring type
    Vinyl, Wood
    Building materials
    Clapboard
    Roof type
    Shingle

    We can help!

    Listing Contact
    Karen Koos

    Listing agent Karen Koos

    Listing office Saltmeadow Properties, Inc. 7 Main Street, Castine, ME

    Listing date Jan 7, 2026

    MLS# 1607988

    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

    • Historic building est. 1765 in the heart of Castine village.
    • Income‑generating property with 3 commercial spaces and 4 residential units.
    • Option for owner's unit while maintaining rental income.
    • Prime corner location at Main and Water Street.
    • High visibility from town dock and Main Street, attracting tourists and yachtsman.
    • Well‑established businesses currently occupying the commercial spaces.

    Overview

    Located at 3 Main Street in Castine, Maine, this mixed-use property presents a unique opportunity. Known as the Castine Variety building, it has been a cornerstone of the village since 1765, serving as a community gathering place. The property includes three commercial spaces currently occupied by established businesses, along with four residential units on the upper floors. This arrangement offers flexibility for a new owner, with the potential for an exclusive owner's unit while generating passive income from the remaining rental units. Situated at the corner of Main and Water Street, the building benefits from high visibility from both the town dock and Main Street, attracting visiting yachtsmen and tourists. The property has a lot size of 0.1 acres and a property size of 5000 square feet. The zoning is commercial.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Ebee's Sweets Bakery Compass Rose Books (Bike/Boat/Book/etc) Store The Breeze & Castine Variety Restaurant

    Map

    City
    Castine
    County
    Hancock
    State
    Maine
    Longitude
    -68.7967921
    Latitude
    44.3878768

    FAQs

    What type of property is this?
    Mixed-use property - Iconic mixed-use building in Castine, Maine with commercial and residential.
    Where is this mixed-use property located?
    The property is located at 3 Main Street Castine, ME.
    What is the asking price?
    The asking price for this property is $1,495,000.
    What are key features of this property?
    This property features: Historic building est. 1765 in the heart of Castine village.; Income‑generating property with 3 commercial spaces and 4 residential units.; Option for owner's unit while maintaining rental income.
    (207) 266-2134
    We can help!
    Listing Contact
    Karen Koos
    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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