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    Charming Key West Duplex Title is generated by Realmo AI

    606 Grinnell Street, Key West, FL 33040

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    For Sale
    $1,750,000

    MULTI_FAMILY - Key West, FL

    Property size:
    1,870 SF
    Lot size:
    0.06 Acres
    Price / SF:
    $935/SF
    Added:
    May 18, 2026
    Days on Market:
    5
    Last Refresh:
    May 22 at 12:06 pm

    Property Features for 606 Grinnell Street

    General Information

    Property type
    Residential Multi Family
    Property subtype
    Other
    Zoning
    HHDR - Historic High Dens
    Bedrooms
    5
    Bathrooms
    3
    Rooms
    Bedroom 4, Bathroom 1, Bedroom 1, Bathroom 2, Bedroom 2, Bedroom 5, Bedroom 3, Bathroom 3
    Patio and Porch features
    Deck, Patio
    Pool private
    1
    Appliances
    Washer, Dryer, Dishwasher, Refrigerator, Range, Oven, Disposal
    Standard status
    Active
    APN
    00011190000000
    Size
    1,870 SF
    Lot size
    0.06 Acres

    Taxes and HOA fees

    Tax Year
    2025
    Tax Description
    Kw Pt Lot 2 Sqr 57 G5-362 Or49-286/87 Or125-251/52 Or130-211 Or137-69/70 Or625-118 Or806-2058 Or1317-338 Or2257-1133 Or2
    Tax Annual Amount
    12427

    Utilities

    Cooling system
    Central Air

    Building Details

    Year built
    1901
    Floors in Building
    2
    Flooring type
    Wood
    Building materials
    Frame
    Roof type
    Metal

    We can help!

    Listing Contact
    Christopher Orth

    Listing agent Christopher Orth License #3275955

    Listing office Berkshire Hathaway HomeServices Knight & Gardner Realty 336 Duval St., Key West, FL

    Listing date May 18, 2026

    MLS# 619947 Listing URL

    Copyright © 2026 Key West Association of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    HighLights

    • Private backyard with sparkling pool.
    • Duplex in the heart of Old Town Key West.
    • Versatile property suitable for investment, multi‑generational living, or rental income.
    • Two units: First floor with 2 bedrooms, 1.5 baths; Second floor with 3 bedrooms, 1 bath and private balcony.
    • Close proximity to Duval Street, historical seaport, dining, shopping, and nightlife.
    • Both units have full‑sized kitchens, dining spaces, and living rooms.

    Overview

    Located in the heart of Old Town Key West, this duplex at 606 Grinnell Street offers a blend of classic Key West character and flexible living opportunities. The first-floor unit features 2 bedrooms and 1.5 baths. The second-floor unit offers 3 bedrooms and 1 bath, complete with a private rear balcony overlooking the backyard. Both units include full-sized kitchens with dining spaces, as well as living rooms. A front porch enhances the home's island charm. The private backyard retreat features a pool. This Old Town property offers potential for investment, multi-generational living, or the option to live in one unit while renting the other. There's a side door entrance for the second unit upstairs, with a lockout door in the first unit for access to upstairs. Situated moments from Duval Street, the property is close to dining, the historical seaport, shopping, and nightlife. The lot size is 0.06 acres and the property size is 1870 square feet.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Hidden Key West ... Travel Agency

    Suggested Use

    Law Firm Restaurant Real Estate Agency Spa & Massage Center Dental Office Hair Salon Nail Salon Food Market Pharmacy Daycare Center

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

    Location Insight

    • Map
    • Local Demand
    City
    Key West
    County
    Monroe
    State
    Florida
    Longitude
    -81.796249
    Latitude
    24.558124

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    FAQs

    What type of property is this?
    Duplex - Versatile Old Town duplex with pool, ideal for investment.
    Where is this duplex located?
    The property is located at 606 Grinnell Street Key West, FL.
    What is the asking price?
    The asking price for this property is $1,750,000.
    What are key features of this property?
    This property features: Private backyard with sparkling pool.; Duplex in the heart of Old Town Key West.; Versatile property suitable for investment, multi‑generational living, or rental income.
    (305) 707-4821
    We can help!
    Listing Contact
    Christopher Orth
    Real Estate License ID: 3275955
    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.

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