Listing Provided Courtesy of Keller Williams Sun Valley Southern Idaho at 208-734-1991
Sun Valley Legacy Estate & Development Masterpiece. Discover the pinnacle of mountain living at 120 Keystone St, a premier 52-acre legacy estate in the exclusive Elkhorn area of Sun Valley, Idaho. This rare dual-parcel landholding (18.6 & 33.5 acres) offers a breathtaking canvas for a private horse property or a high-end boutique residential development. The Ultimate Equestrian & Outdoor Retreat: Bordering U.S. Forest Service land, the estate provides unparalleled private canyon access for horseback riding and hiking. Secure your legacy with 1883 water rights (irrigation/stock) and a high-yield well. The property features a serene pond with on-site geothermal potential, creating a year-round alpine oasis for wildlife and residents alike. Developer Upside & Infrastructure: Zoned BC/R-10 with patented mining claims, the land is ready for a luxury compound or multi-homesite project. Utilities (well, septic, buried power) are already installed. Significant val Search address on YouTube for video tours.
Property Details
Price:
$5,250,000
MLS #:
98979014
Status:
Active
Beds:
0
Baths:
0
Type:
Land
Subtype:
Build to Suit Residential
Subdivision:
Elkhorn Sub
Neighborhood:
blainecustercounty1525
Listed Date:
Mar 23, 2026
Lot Size:
2,265,120 sqft / 52.00 acres (approx)
See this Listing
Schools
Interior
Exterior
Fencing
Fence/Livestock
Lot Features
Over 40 Acres, Pasture, Sloped, Views, Wooded, Borders Public Owned Land
Waterfront Features
Pond/Stream/Creek
Financial
Tax Year
2025
Taxes
$1,207
Map
Community
- Address120 Keystone Sun Valley ID
- SubdivisionElkhorn Sub
- CitySun Valley
- CountyBlaine
- Zip Code83353
Subdivisions in Sun Valley
Market Summary
Current real estate data for Land in Sun Valley as of May 11, 2026
1
Land Listed
49
Avg DOM
$5,250,000
Avg List Price
Property Summary
- Located in the Elkhorn Sub subdivision, 120 Keystone Sun Valley ID is a Land for sale in Sun Valley, ID, 83353. It is listed for $5,250,000 and features 52 acres. To schedule a showing of MLS#98979014 at 120 Keystone in Sun Valley, ID, contact your Ralston Group Properties, LLC agent at 2087035666.
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Listing courtesy of Keller Williams Sun Valley Southern Idaho
Disclaimer: The data relating to real estate for sale on this web site comes in part from the IDX program of the Intermountain Multiple Listing Service. Real estate listings held by brokerage firms other than Ralston Group Properties, LLC are marked with the Intermountain Multiple Listing Service Logo. Detailed information for these types of listings shall include the name of the listing Brokerage. Information provided by IMLS is deemed reliable but not guaranteed. IDX information is provided exclusively for consumers personal, non-commercial use, that it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. IMLS does not assume any liability for missing or inaccurate data. Copyright 2026. Intermountain Multiple Listing Service, Inc. All rights reserved.120 Keystone
Sun Valley, ID