Star, ID 83669 21805 Koa Lane
$8,977,000



45 more













































Presented By: Amherst Madison - 208-391-2391
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
SQFT • 11,919