Star, ID 83669 21805 Koa Lane

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Presented By: Amherst Madison - 208-391-2391
  • MLS# 98988268
  • 05/29/2026
  • Request Tour
  • Request Info
  • Beds • 5
  • Baths • 7
  • SQFT • 11,919
  • Garage • 16

Home Details

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.
Presented By: Amherst Madison - 208-391-2391

Interior Features for 21805 Koa Lane

Bedrooms

Bedroom 3 Area256
Bedroom 3 Length16
Bedroom 3 LevelMain
Bedroom 3 Width16
Bedroom 4 Area256
Bedroom 4 Length16
Bedroom 4 LevelMain
Bedroom 4 Width16
Bedroom 5 Area256
Bedroom 5 Length16
Bedroom 5 LevelMain
Bedroom 5 Width16
Main Level Bedrooms5
Primary Bedroom Area368
Primary Bedroom Length16
Primary Bedroom Width23
Primary on Main195
Second Bedroom Length13
Second Bedroom LevelMain
Second Bedroom Width15
Total Bedrooms5

Bathrooms

Main Level Bathrooms6
Total Baths7

Kitchen

Kitchen LevelMain

Other Interior Features

LivingAreaSourcePlans
Above Grade Finished Area11919
Above Grade Finished Area SourcePlans
Above Grade Finished Area Unit TypeSquare Feet
Air Conditioning Y/NYes
Below Grade Finished Area0
Below Grade Finished Area SourcePlans
Below Grade Finished Area Unit TypeSquare Feet
Fireplace FeaturesThree or More
Fireplace Y/NYes
FlooringHardwood
Heating Y/NYes
Interior AmenitiesBath-Master
Power Production TypePhotovoltaics

Other Rooms

Family Room Area720
Family Room Length24
Family Room LevelMain
Family Room Width30
Living Room Area360
Living Room Length18
Living Room LevelMain
Living Room Width20

General for 21805 Koa Lane

AppliancesDishwasher
Assoc Fee Paid PerAnnually
Attached Garage Yes
Building Area UnitsSquare Feet
Carport Y/NNo
CityStar
Construction MaterialsFrame
CoolingCentral Air
CountyCanyon
Current UseSingle Family
DirectionsUse Google Maps to get to the location address. From Downtown Star, Continue West on Highway 44, S on Bent Ln, SE on Castagnola Ln, Then S on Chateau Ct.
Elementary SchoolMill Creek
Elementary School DistrictMiddleton School District #134
FreeholdIDX
Garage Spaces16
Garage Y/NYes
HOAYes
HOA Fee$1000
HeatingForced Air
High SchoolMiddleton
High School DistrictMiddleton School District #134
Land Lease Y/NNo
LeasableAreaUnitsSquare Feet
Legal Description13-4N-2W NE TX 22615 IN SENE & GOVT LT 1 & NESE
LevelsTwo
Living Area UnitsSquare Feet
Lot Size Square Feet745747.2
Lot Size UnitsAcres
Middle/Junior High SchoolMiddleton Jr
Middle/Junior School DistrictMiddleton School District #134
ModificationTimestamp2026-07-14T18:56:46.900Z
OwnershipFee Simple
Patio/Porch FeaturesCovered Patio/Deck
Pool FeaturesIn Ground
Primary Bedroom LevelMain
Property SubtypeSingle Family w/ Acreage
Property TypeResidential
RoofArchitectural Style
Security FeaturesAlarm
SewerSeptic Tank
Spa FeaturesHot Tub/Spa
Standard StatusActive
StatusActive
Subdivision Name0 Not Applicable
Tax Annual Amount19693.58
Tax Year2025
Waterfront FeaturesWaterfront
Year Built2015

Exterior for 21805 Koa Lane

Building Area Total11919
Covered Spaces16
Lot Features10 - 19.9 Acres
Lot Size Acres17.12
Lot Size Area17.12
Parking FeaturesAttached
SpaYes
Total Parking16
Water SourceWell
Waterfront Y/NYes

Additional Details

Price History

Schools

High School Middleton High School
Elementary School Mill Creek Elementary School
Middle School Middleton Jr Middle School

Julie Hackl

Agent
Price $8,977,000
MLS#98988268
List Date 05/29/2026
Property Type Single Family
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