120 Keystone St

2,265,120 / 52
Lot Size / Acres

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. The Ultimate Equestrian & Outdoor Retreat: Bordering U. S. Forest Service land, the estate provides unparalleled private canyon access for horseback...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 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 val Search address on YouTube for video tours.
  1. Listed by James Tautkus • Keller Williams Sun Valley Southern Idaho • Main: 208-734-1991

Property Details for 120 Keystone Street

View
Yes
Waterfront Features
Pond/Stream/Creek
Waterfront
Yes
Subdivision Name
Elkhorn Sub
LISTING UPDATED: 03/26/2026 01:52 AM

Property Details for 120 Keystone Street

StatusActive
MLS #98979014
Days on Market4
Taxes$1,207 / year
HOA Fees-
Condo/Co-op Fees-
Compass TypeLand
MLS TypeLand / Build to Suit Residential
Year Built-
Lot Size52.00 AC
CountyBlaine County

Location

Listing Courtesy of Keller Williams Sun Valley Southern Idaho
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Building Information for 120 Keystone Street

Building Size-Lot Size52.00 AC

Payment Calculator

$25,579 per month

30 year fixed, 6.11% Interest

Principal and Interest

$25,479

Property Taxes

$101

HOA Dues

$0

The Payment Calculator is for illustrative purposes only.

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Property Information for 120 Keystone Street

Summary
Location and General Information
  • Zoning Description: BC/R-10 (UIB)
Taxes and HOA
  • Tax Legal Description: Elkhorn 46, Keystone 41 A, Carbon Hill 74 A, SEC 15 4N 18E
  • Tax Year: 2025
  • Additional Parcels Description: RP1M0000000760
  • Additional Parcels: Yes
  • Parcel Number: RP1M0000000750
Virtual Tour
Property
Lot Information
  • RoadSurfaceType: Dirt, Gravel, Paved
  • Above Grade Finished Area Units: Square Feet
  • Below Grade Finished Area Units: Square Feet
  • Building Area Units: Square Feet
  • Farm Land Area Units: Square Feet
  • Living Area Units: Square Feet
  • Lot Features: Over 40 Acres, Pasture, Sloped, Views, Wooded, Borders Public Owned Land
  • Lot Size Acres: 52.0
  • Lot Size Area: 52.0
  • Lot Size Square Feet: 2265120.0
  • Lot Size Units: Acres
Property and Assessments
  • Documents Available: Appraisal, Survey/Plat
  • Photos Count: 37
  • Road Frontage Type: Easement
Utilities
  • Sewer: Septic Tank
  • Utilities: Propane, Phone Connected, Electricity Connected, Sewer Connected, Underground Utilities
  • Water Source: Well, Geothermal
Interior and Exterior Features
Exterior Features
  • Fencing: Fence/Livestock
Interior Features
  • Electric: Installed
  • Electric On Property: Yes

Property History for 120 Keystone Street

DateEvent & SourcePriceAppreciation
Mar 23, 2026

Listed (Active)

IMLS #98979014

$5,250,000
Nov 30, 2025

Withdrawn

IMLS #98950150

Nov 18, 2025

Price Change

IMLS #98950150

$5,400,000
Aug 1, 2025

Price Change

IMLS #98950150

$5,900,000
Jun 6, 2025

Price Change

IMLS #98950150

$6,900,000
Jun 6, 2025

Price Change

IMLS #98950150

$5,900,000
Jun 6, 2025

Listed (Active)

IMLS #98950150

$5,400,000
Sep 19, 2024

Withdrawn

IMLS #98923825

Sep 14, 2024

Price Change

IMLS #98923825

$9,500,000
Sep 13, 2024

Price Change

IMLS #98923825

$95,000,000
Sep 13, 2024

Listed (Active)

IMLS #98923825

$9,500,000
DateEvent & SourcePrice
03/23/2026

Listed (Active)

IMLS #98979014

$5,250,000
11/30/2025

Withdrawn

IMLS #98950150

11/18/2025

Price Change

IMLS #98950150

$5,400,000
08/01/2025

Price Change

IMLS #98950150

$5,900,000
06/06/2025

Price Change

IMLS #98950150

$6,900,000
06/06/2025

Price Change

IMLS #98950150

$5,900,000
06/06/2025

Listed (Active)

IMLS #98950150

$5,400,000
09/19/2024

Withdrawn

IMLS #98923825

09/14/2024

Price Change

IMLS #98923825

$9,500,000
09/13/2024

Price Change

IMLS #98923825

$95,000,000
09/13/2024

Listed (Active)

IMLS #98923825

$9,500,000

For completeness, Compass often displays two records for one sale: the MLS record and the public record.

Schools near 120 Keystone Street

This home is within Blaine County District.
Rating
School
Type
Grades
Distance
Public - PK to 8
Public - 9 to 12
Public - 6 to 8
Public - PK to 5
Rating
School
Distance
Ernest Hemingway Elementary School
PublicPK to 8

Wood River High School
Public9 to 12

Wood River Middle School
Public6 to 8

Hailey Elementary School
PublicPK to 5

School ratings and boundaries are provided by GreatSchools.org and Pitney Bowes. This information should only be used as a reference. Proximity or boundaries shown here are not a guarantee of enrollment. Please reach out to schools directly to verify all information and enrollment eligibility.

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120 Keystone Street is a 52 ac of land for sale in Sun Valley, ID 83353. This property was listed for sale on March 23, 2026 by Keller Williams Sun Valley Southern Idaho, it's currently listed at $5,250,000. This listing's school district is Blaine County District. Nearby schools include Ernest Hemingway Elementary School, Wood River High School and Wood River Middle School. 120 Keystone Street is a 0-bed, 0-bath, 52 ac of land on a 2,265,120 sq. ft. / 52 acres lot.

No guarantee, warranty or representation of any kind is made regarding the completeness or accuracy of descriptions or measurements (including square footage measurements and property condition), such should be independently verified, and Compass, Inc., its subsidiaries, affiliates and their agents and associated third parties expressly disclaims any liability in connection therewith. Photos may be virtually staged or digitally enhanced and may not reflect actual property conditions. Offers of compensation are subject to change at the discretion of the seller. No financial or legal advice provided. Equal Housing Opportunity. Subject to change at any time. Compass, Inc., its subsidiaries, affiliates and their agents and associated third parties make no guarantee, warranty or representation regarding the accuracy of any waterfront feature, water view or waterfront view.

Listing Courtesy of Keller Williams Sun Valley Southern Idaho

Based on information from one of the following Multiple Listing Services: Sun Valley Board of REALTORS®, Intermountain MLS, Mountain Central Association of REALTORS. Information being provided is for the visitor’s personal, noncommercial use and may not be used for any purpose other than to identify prospective properties visitor may be interested in purchasing. The data contained herein is copyrighted by Sun Valley Board of REALTORS®, Intermountain MLS, Mountain Central Association of REALTORS is protected by all applicable copyright laws. Any dissemination of this information is in violation of copyright laws and is strictly prohibited. Property information referenced on this web site comes from the Internet Data Exchange (IDX) program of the MLS. This web site may reference real estate listing(s) held by a brokerage firm other than the broker and/or agent who owns this web site. For the avoidance of doubt, the accuracy of all information, regardless of source, is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals.