A one-of-a-kind opportunity to own one of Idaho’s most iconic legacy estates. Privately positioned behind the gates of an exclusive waterfront enclave, this extraordinary 17.5-acre property offers over 1,200 feet of Boise River frontage, more than 2,400 feet of private lake frontage, and unmatched privacy bordered by protected state land. Encompassing nearly 12,000 sq ft with 6,000+ sq ft of covered outdoor living and 4,200+ sq ft of garage space, the residence was designed for year-round entertaining and resort-style living. Extensive renovations completed between 2024-2026 introduced designer finishes, custom stonework, and dramatic walls of glass with water views from every room. Amenities include a full indoor regulation basketball court with viewing lounge, professional-grade pickleball court, remodeled upstairs lounge and poker room with second kitchen and statement wine room, state-of-the-art theater with seating for 12, and a wellness retreat featuring a commercial-grade gym with $70k+ in Rogue equipment and sauna. Outdoor living is unparalleled with a heated pool and spa, waterfall-edge features, private lakes, sandy beachfront, new dock, outdoor kitchen with Wolf grill and Traeger smoker, fire features, pergola lounges, fountains, and curated entertaining spaces throughout. An extraordinary blend of luxury, recreation, privacy, and natural beauty.
Active
$8,977,000
21805 Koa Ln, Star, ID 83669
5beds
7baths
11,919sqft
Single Family Residence
Built in 2015
17.12 Acres Lot
$8,227,400 Zestimate®
$753/sqft
$83/mo HOA
What's special
New dockWaterfall-edge featuresHeated pool and spaDesigner finishesFire featuresCustom stoneworkPrivate lakes
- 40 days |
- 5,948 |
- 388 |
Zillow last checked:
Listing updated:
Listed by:
Matt Bauscher Main:208-391-2391,
Amherst Madison
Source: IMLS,MLS#: 98988268
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Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 5
- Bathrooms: 7
- Main level bathrooms: 6
- Main level bedrooms: 5
Primary bedroom
- Level: Main
- Area: 368
- Dimensions: 16 x 23
Bedroom 2
- Level: Main
- Area: 195
- Dimensions: 13 x 15
Bedroom 3
- Level: Main
- Area: 256
- Dimensions: 16 x 16
Bedroom 4
- Level: Main
- Area: 256
- Dimensions: 16 x 16
Bedroom 5
- Level: Main
- Area: 256
- Dimensions: 16 x 16
Family room
- Level: Main
- Area: 720
- Dimensions: 24 x 30
Kitchen
- Level: Main
Living room
- Level: Main
- Area: 360
- Dimensions: 18 x 20
Office
- Level: Main
- Area: 168
- Dimensions: 12 x 14
Heating
- Forced Air, Passive Solar
Cooling
- Central Air
Appliances
- Included: Dishwasher, Disposal, Double Oven, Microwave, Oven/Range Built-In, Refrigerator, Water Softener Owned, Gas Range
Features
- Bath-Master, Bed-Master Main Level, Guest Room, Split Bedroom, Den/Office, Family Room, Great Room, Sauna/Steam Room, Rec/Bonus, Two Kitchens, Two Master Bedrooms, Walk-In Closet(s), Walk In Shower, Breakfast Bar, Pantry, Kitchen Island, Quartz Counters, Number of Baths Main Level: 6, Number of Baths Upper Level: 0.5
- Flooring: Hardwood
- Has basement: No
- Has fireplace: Yes
- Fireplace features: Three or More, Gas
Interior area
- Total structure area: 11,919
- Total interior livable area: 11,919 sqft
- Finished area above ground: 11,919
- Finished area below ground: 0
Property
Parking
- Total spaces: 16
- Parking features: Attached, RV Access/Parking, Garage (Drive Through Doors), Driveway
- Attached garage spaces: 16
- Has uncovered spaces: Yes
Features
- Levels: Two
- Patio & porch: Covered Patio/Deck
- Exterior features: Dog Run
- Has private pool: Yes
- Pool features: In Ground, Pool, Private
- Has spa: Yes
- Spa features: Heated, Bath
- Has view: Yes
- On waterfront: Yes
- Waterfront features: Waterfront, Lake, Pond, River
Lot
- Size: 17.12 Acres
- Features: 10 - 19.9 Acres, Garden, Irrigation Available, Views, Borders Public Owned Land, Chickens, Flood Plain, Wooded, Auto Sprinkler System, Drip Sprinkler System, Full Sprinkler System, Irrigation Sprinkler System
Details
- Parcel number: R34035010B0
Construction
Type & style
- Home type: SingleFamily
- Property subtype: Single Family Residence
Materials
- Frame, Stone, Stucco
- Roof: Architectural Style
Condition
- Year built: 2015
Utilities & green energy
- Sewer: Septic Tank
- Water: Well
Community & HOA
Community
- Security: Alarm
HOA
- Has HOA: Yes
- HOA fee: $1,000 annually
Location
- Region: Star
Financial & listing details
- Price per square foot: $753/sqft
- Tax assessed value: $4,800,510
- Annual tax amount: $19,693
- Date on market: 5/29/2026
- Ownership: Fee Simple
Estimated market value
$8,227,400
$7.82M - $8.64M
$6,750/mo
Price history
Price history is unavailable.
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $19,694 -7.5% | $4,800,510 +1.5% |
| 2024 | $21,289 +9.2% | $4,730,960 +18.2% |
| 2023 | $19,503 +133845.7% | $4,002,860 +251652.2% |
| 2022 | $15 -18.2% | $1,590 +15.2% |
| 2021 | $18 +43.8% | $1,380 +10.4% |
| 2020 | $12 -22.5% | $1,250 -0.8% |
| 2019 | $16 +9.3% | $1,260 +17.8% |
| 2017 | $15 -27.5% | $1,070 |
| 2016 | $20 | -- |
| 2015 | $20 +9.1% | -- |
| 2014 | $18 | $700 |
Find assessor info on the county website
Monthly payment
Est. payment$--/mo
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.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.
Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
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Climate risks
Neighborhood: 83669
Nearby schools
GreatSchools rating
- 8/10Middleton Mill Creek Elementary SchoolGrades: PK-5Distance: 5.2 mi
- NAMiddleton Middle SchoolGrades: 6-8Distance: 6 mi
- 8/10Middleton High SchoolGrades: 9-12Distance: 7.3 mi
Schools provided by the listing agent
- Elementary: Mill Creek
- Middle: Middleton Jr
- High: Middleton
- District: Middleton School District #134
Source: IMLS. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
A local agent can set up tours, give advice and negotiate with sellers.
- Idaho
- Canyon County
- Star
- 83669
- 21805 Koa Ln
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