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New construction
  • $11,750,000

    300 E River St E #350, Ketchum, ID 83340

    4beds
    3,480sqft
    : 
    $72,064/mo
    Get pre-qualified
    Condominium
    Built in 2026
    -- sqft lot
    $-- Zestimate®
    $3,376/sqft
    $-- HOA

    What's special

    Sweeping mountain viewsSingle-level penthouse residence
    The Observatory Sun Valley, A Viceroy Resort, offers twelve single-level penthouse residences with sweeping mountain views, with only eight remaining. The only 4-bedroom residence remaining features 4 en suite baths plus a powder room, an approx. 900 SF partially covered terrace, and unobstructed views of Bald Mountain, the southern hills, Wood River Valley and Dollar Mountain. Adorning The Observatory Sun Valley, A Viceroy Resort, twelve single-level penthouse residences with sweeping views of Idaho's Rocky Mountains are coming to life. Only eight remain available. West wing, Highway 75 side, south and east views with full unobstructed views of Bald Mountain, the southern hills and down the Wood River Valley, and views east to Dollar Mountain. 3,480 saleable square feet. The only four-bedroom, 4 ensuite bath and powder room, remaining for purchase. This includes an approximate 900 square foot exterior terrace assigned exclusively as limited common area. The exterior terrace is partially covered as well by the exterior "butterfly" roof that extends to the south. Ownership of these singular residences includes highly personalized service and access to a full suite of amenities, from a spa and fitness center to thermal pools, meeting spaces, cafe, restaurant, bar, ski concierge, and a state of the art observatory conveniently located at the gateway to downtown Ketchum and just minutes from all the mountain adventures Sun Valley has to offer.
    4 days
    212
    10

    Zillow last checked:

    Listing updated:

    Listed by:

    Burnett Properties 208-720-0906,

    Keller Williams Sun Valley Southern Idaho

    Source: Sun Valley BOR MLS,MLS#: 26-335089MLS Logo

      Facts & features

      Interior

      Bedrooms & bathrooms
      • Bedrooms: 4
      • Bathrooms: 5
      • Full bathrooms: 4
      • 1/2 bathrooms: 1
      Heating
      • Has Heating (Unspecified Type)
      Features
      • Flooring: Wood
      • Has fireplace: Yes
      Interior area
      • Total structure area: 3,480
      • Total interior livable area: 3,480 sqft
      • Finished area above ground: 3,480

      Property

      Details
      • Parcel number: RPK00000830020
      • Zoning: K/T

      Construction

      Type & style
      • Home type: Condo
      • Architectural style: Contemporary,1st Floor Primary
      • Property subtype: Condominium
      Materials
      • Concrete
      Condition
      • New Construction
      • New construction: Yes
      • Year built: 2026

      Community & HOA

      HOA
      • Has HOA: Yes
      • Services included: Insurance, Maintenance Structure, Sewer, Snow Removal, Trash, Water
      • HOA name: Viceroy Hotel Group
      Location
      • Region: Ketchum

      Financial & listing details

      • Price per square foot: $3,376/sqft
      • Date on market: 11/6/2026
      • Inclusions: Washer, Refrigerator, Range - Elec, Oven - Elec, Microwave, Hood Fan, Dryer, Disposal
      • Road surface type: Paved

        Estimated market value

        Not available

        Estimated sales range

        Not available

        Not available

        Price history

        DateEventPrice
        11/6/2026Listed for sale$11,750,000$3,376/sqft
        Source: Sun Valley BOR MLS #26-335089 Report a problem

        Public tax history

        Tax history is unavailable.

        Monthly payment

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        All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
        HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
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        Climate risks

        Neighborhood: 83340

        Getting around

        70 / 100
        Very Walkable
        51 / 100
        Bikeable

        Nearby schools

        GreatSchools rating

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