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    • Price cut: $1.3M (7/17)
    $7,700,000

    21805 Koa Ln, Star, ID 83669

    5beds
    7baths
    11,919sqft
    : 
    $47,085/mo
    Get pre-qualified
    Single Family Residence
    Built in 2015
    17.12 Acres Lot
    $7,119,400 Zestimate®
    $646/sqft
    $83/mo HOA

    What's special

    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.
    39 days
    |
    3,512
    |
    228
    |

    Zillow last checked:

    Listing updated:

    Listed by:

    Matt Bauscher Main:208-391-2391,

    Amherst Madison

    Source: IMLS,MLS#: 98994369MLS Logo

      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: $646/sqft
      • Tax assessed value: $4,800,510
      • Annual tax amount: $19,693
      • Date on market: 7/17/2026
      • Ownership: Fee Simple

        Estimated market value

        $7,119,400

        $6.76M - $7.48M

        $6,750/mo

        Price history

        Price history is unavailable.

        Public tax history

        YearProperty taxesTax 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

        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.
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        Climate risks

        Neighborhood: 83669

        Getting around

        0 / 100
        Car-Dependent
        32 / 100
        Somewhat Bikeable

        Nearby schools

        GreatSchools rating
        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.

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