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    120 Keystone St Sun Valley, ID 83353

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    Claim this Listing
    For Sale
    $5,250,000

    LAND - Sun Valley, ID

    Type:Single Family Residence
    Lot size:
    52.00 Acres
    Added:
    Mar 12, 2026
    Days on Market:
    48
    Last Refresh:
    Apr 28 at 10:06 pm

    Property Features for 120 Keystone St

    General Information

    Property type
    Land
    Property subtype
    Single Family Residence
    Zoning
    BC/R-10
    Exterior features
    Barn/Shed, Corral, Deeded Water Rights, Fence, Outbuildings, Views, Undergrnd Utilities, Leased Propane Tank, Horses Permitted
    Fencing
    Fenced
    Standard status
    Active
    APN
    RP1M0000000750
    Lot size
    52.00 Acres

    Taxes and HOA fees

    Tax Year
    2025
    Tax Description
    Elkhorn 46, Keystone 41 A, Carbon Hill 74 A, SEC 15 4N 18E
    Tax Annual Amount
    1207

    Utilities

    Water front features
    Pond
    Water front
    1

    Building Details

    Additional Structures
    Outbuilding

    We can help!

    Listing Contact
    James Tautkus
    James Tautkus

    Listing agent James Tautkus License #AB43803

    Listing office Keller Williams Sun Valley Southern Idaho 647 Filer Ave Suite 101, Sun Valley, ID

    Listing date Mar 12, 2026

    MLS# 26-334170 Listing URL

    Copyright © 2026 Sun Valley Board 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.

    Overview

    Sun Valley Legacy Estate Land

    This 52-acre legacy estate is located at 120 Keystone St in the Elkhorn area of Sun Valley, Idaho. The property consists of two parcels, 18.6 and 33.5 acres, and is zoned BC/R-10. Bordering U.S. Forest Service land, the estate provides private canyon access for horseback riding and hiking. The property includes senior 1883 water rights for irrigation and stock, as well as a high-yield well. A pond and on-site geothermal potential are present. Utilities, including a well, septic system, and buried power, are installed. The land is suitable for a private horse property or a high-end boutique residential development. Patented mining claims are included. There is potential for a USFS land swap and a third building site. The property is located minutes from Ketchum and Sun Valley Resort.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Horse & equestrian properties

    Map

    City
    Sun Valley
    County
    Blaine
    State
    Idaho
    Longitude
    -114.303313
    Latitude
    43.677231

    Nearby Similar for Sale

    • $5,250,000

      Sun Valley Legacy Estate Land

      Premier 52-acre estate in Sun Valley's Elkhorn area.
      120 Keystone, Sun Valley, ID 83353
      View Details
    • $1,595,000

      Sun Valley Building Site

      Stunning 4.34 acre building site in Sun Valley.
      507 Juniper Rd, Sun Valley, ID 83353
      View Details
    • $2,195,000

      Sun Valley Land Opportunity

      Desirable lot to build your dream home in Sun Valley.
      92 Elkhorn Rd, Sun Valley, ID 83353
      View Details

    FAQs

    What type of property is this?
    Land - 52-acre estate in Elkhorn area, Sun Valley, Idaho.
    Where is this land located?
    The property is located at 120 Keystone St Sun Valley, ID.
    What is the asking price?
    The asking price for this property is $5,250,000.
    What are key features of this property?
    This property features: Premier 52‑acre legacy estate in the exclusive Elkhorn area.; Borders U.S. Forest Service land, providing unparalleled private canyon access.; Senior 1883 water rights and a high‑yield well ensure water security.
    (208) 622-7722
    We can help!
    Listing Contact
    James Tautkus
    James Tautkus
    Real Estate License ID: AB43803
    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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