120 Keystone St, Sun Valley, ID 83353

Discover 120 Keystone St, a premier 52-acre legacy estate for sale in the exclusive Elkhorn area of Sun Valley, Idaho. Positioned just minutes from downtown Ketchum and the Sun Valley Resort, this rare dual-parcel landholding--comprising 18.6 and 33.5 acres--offers an unparalleled opportunity for a private equestrian compound or a boutique luxury residential development. Bordering U.S. Forest Service land, the property provides direct, private canyon access for horseback riding, hiking, and outdoor recreation right from your back door. Appraised at $10.5M, this Sun Valley real estate asset combines pristine natural amenities with exceptional utility. The land is anchored by senior 1883 water rights for irrigation and stock, a high-yield well, and a serene pond with on-site geothermal potential. Ready for immediate development, the property features BC/R-10 zoning with patented mining claims, along with installed infrastructure including well, septic, and buried power. Significant value-add and investment upside include a prospective 18-acre USFS land swap to expand contiguous acreage, as well as a recent site analysis indicating potential for a third building site to increase overall density. As one of the last large private landholdings in a supply-constrained Blaine County market, the seller is offering flexible acquisition terms, including owner financing (owner carry paper) for up to five years with 50% down. Search "120 Keystone St Sun Valley" on YouTube to view complete video tours.