120 Keystone St, Sun Valley, ID 83353

New Listing
$5,250,000
Property Type: Vacant Land Lot Size (sq. ft.): 2,265,120 Status: Active
Current Price: $5,250,000 List Date: 3/12/2026 Last Modified: 3/12/2026

Description

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.

Supplements: 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.

More Information MLS# 26-334170

Location Tax and Misc

Current Price: $5,250,000 Area: Sun Valley Street Number: 120 Street Name: Keystone Street Suffix: St State/Province: ID Zip Code: 83353 County: Blaine Subdivision: Other Assessor's Parcel #: RP1M0000000750 List Price: $5,250,000

Lot Acreage Info

Parcel SqFt Apx: 2265120

General Property Description

Sub Type: Single Family Residence Realtor.com: Vacant Land Waterfront if Appcbl: Yes Geo Lat: 43.679711 Geo Lon: -114.301652

Contract Info

Status: Active List Date: 2026-03-12 Concession Negotiable: Yes Concession Remarks: Please Call Listing Agent. Directions: Keystone Rd in Elkhorn, Sun Valley

Property Features

Zoning: BC/R-10 Road Surface: Dirt Road Access: Easement; Private Utilities On Site: Electric; Septic; Telephone; Well-Individual Waterfront: Pond; See Realtor Remarks; Wetlands Features Exterior: Barn/Shed; Corral; Deeded Water Rights; Fence; Outbuildings; Undergrnd Utilities; Views; Horses Permitted; Leased Propane Tank Documents: Other Other Disclosures: Avalanche; Wetlands Terms: 1031; Cash; OWC Utilities at Road: Electric; Telephone
Listing Office: Keller Williams Sun Valley Southern Idaho
Listing Agent: James Tautkus
Last Updated: March - 12 - 2026
The information being provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties. This serves as notice to those using the website that they may not use the data found here as a basis for a business enterprise. Information provided by Sun Valley Board of Realtors Multiple Listing Service is deemed reliable but not guaranteed. Property of the Sun Valley Board of Realtors. Information provided by Sun Valley Board of Realtors Multiple Listing Service is deemed reliable but not guaranteed. The information on this sheet has been made available by the MLS and may not be the listing of the provider.