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.
Search address on YouTube for video tours. 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 senior 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 value-add opportunities exist through a potential 18-acre USFS land swap, and recent analysis indicates potential for a third building site, offering even greater density and investment value.
Strategic Opportunity: Located minutes from Ketchum and Sun Valley Resort, this $10.5M-appraised asset is offered with flexible acquisition options. Owner will carry paper for up to five years with 50% down; other terms are negotiable. Control one of the last large private holdings in a supply-constrained market.
Search address on YouTube for video tours. 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 senior 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 value-add opportunities exist through a potential 18-acre USFS land swap, and recent analysis indicates potential for a third building site, offering even greater density and investment value.
Strategic Opportunity: Located minutes from Ketchum and Sun Valley Resort, this $10.5M-appraised asset is offered with flexible acquisition options. Owner will carry paper for up to five years with 50% down; other terms are negotiable. Control one of the last large private holdings in a supply-constrained market.
Property Details
Price:
$5,250,000
MLS #:
26-334170
Status:
Active
Beds:
0
Baths:
0
Type:
Land
Subtype:
Single Family Residence
Neighborhood:
sunvalley
Listed Date:
Mar 12, 2026
Lot Size:
2,265,120 sqft / 52.00 acres (approx)
See this Listing
Schools
Interior
Exterior
Fencing
Fenced
Other Structures
Barn(s), Corral(s), Outbuilding
View
See Remarks
Waterfront Features
Pond, See Realtor Remarks, Wetlands
Financial
Tax Year
2025
Taxes
$1,207
Map
Community
- Address120 Keystone St Sun Valley ID
- SubdivisionOther
- 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
4
Land Listed
54
Avg DOM
$2,785,000
Avg List Price
Property Summary
- Located in the Other subdivision, 120 Keystone St 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#26-334170 at 120 Keystone St in Sun Valley, ID, contact your Ralston Group Properties, LLC agent at 2087035666.
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120 Keystone St
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