Ad #5597482
MLS #26-335089
The Observatory Sun Valley, A Viceroy Resort, offers twelve
300 E River St E 350, Ketchum, ID 83340
$11,750,000
4Beds
5Baths
3,480Sqft
--Acres
About this property
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.
Property Features
4 Beds
5 Baths
3,480 Sqft
Built in 2026
0.000 Acres
1 Story
Siding: Concrete
Membrane, Composition Roof
Has Swimming Pool
Has Fireplace
Radiant, Heat Pump (Heating)
Blaine County
Additional Photos
Contact Information
Burnett Properties
Keller Williams Sun Valley Southern Idaho
208-720-0906
Location
Listing Agent: Burnett Properties 208-720-0906
Broker: Keller Williams Sun Valley Southern Idaho 208-622-7722 Listing Site
Copyright © 2026 Sun Valley Board of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Broker: Keller Williams Sun Valley Southern Idaho 208-622-7722 Listing Site
Copyright © 2026 Sun Valley Board of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
BarrierFreeHome.com
Printed Nov 7, 2026
Photo Gallery
$11,750,000
4
Beds
5
Baths
3,480
Sqft
300 E River St E 350, Ketchum, ID 83340
By contacting this agent you agree to these Terms and Conditions.
MLS# 26-335089
$11,750,000
300 E River St E 350, Ketchum, ID 83340
4
Beds
5
Baths
3,480
Sqft
--
Acres
4 Beds
5 Baths
3,480 Sqft
-- Acres
Accessibility Features
Accessible Elevator Installed
The Observatory Sun Valley, A Viceroy Resort, offers twelve
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.
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Property Details
HOME DETAILS
4 Beds
5 Baths
3,480 Sqft
Built in 2026
0.000 Acres
1 Story
EXTERIOR
Siding: Concrete
Membrane, Composition Roof
Has Swimming Pool
INTERIOR
Has Fireplace
Radiant, Heat Pump (Heating)
FINANCIAL & COMMUNITY
Blaine County
See More Details
Location
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Ad Statistics
Ad Number
5597482
Viewed
6 times
Listing Status
Active
Added
Nov 06, 2026
Last Refreshed
Nov 07, 2026 05:56:37 PM
Listing Information
Data Source
Sun Valley Board of Realtors
Source Property ID
26-335089
Listing Agent: Burnett Properties 208-720-0906
Broker: Keller Williams Sun Valley Southern Idaho 208-622-7722 Listing Site
Copyright © 2026 Sun Valley Board of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Broker: Keller Williams Sun Valley Southern Idaho 208-622-7722 Listing Site
Copyright © 2026 Sun Valley Board of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
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