Boulder, CO 80304 3633 21st St

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Presented By: The Agency - Boulder; 7203941997
  • MLS# 1031592
  • 04/18/2025
  • Request Tour
  • Request Info
  • Beds • 7
  • Full/Half Baths • 4 / 1
  • SQFT • 6,988
  • Garage • 3

Home Details

Exquisite secluded sanctuary in the heart of Carolyn Heights. Tucked into one of Boulder's most prestigious enclaves, this estate offers a rare fusion of luxury, privacy, and relaxed sophistication . Set on a serene, tree-lined .81-acre level lot, this 7-bedroom, 5-bathroom oasis is where inspired design meets effortless living. Stunning views of the Flatirons awaken you each morning from your bed. Those same views tease your senses from the expansive patios with fully retractable doors that blur the lines from inside to outside. Bathed in natural light from soaring windows and skylights, every detail has been thoughtfully curated. Custom walnut doors and paneling welcome you into the home and invite you to explore. The chef's kitchen is a showstopper-featuring custom cabinetry, an oversized marble island, and top-of-the-line Thermador appliances. The open-concept layout flows seamlessly into a lush backyard oasis, perfect for gatherings or quiet moments of retreat by the fire pit. The primary suite is a haven unto itself with vaulted ceilings, a spa-inspired bath, spacious walk-in closet, and private deck access. With multiple flexible living spaces-including a dedicated home office and media room, this home is ready to adapt to your every need. Located moments from North Boulder's best hiking trails, cycling routes, farmers markets, and local eateries-yet nestled in the peaceful privacy of a mature, sought-after neighborhood. Elevated living starts here. LIVE BOULDER, LOVE BOULDER!
Presented By: The Agency - Boulder; 7203941997

Interior Features for 3633 21st St

Bedrooms

RoomBedroomFeaturesCarpet
Bedroom 2 FeaturesWood Floor
Bedroom 3 Area195
Bedroom 3 FeaturesWood Floor
Bedroom 3 Length15
Bedroom 3 LevelUpper
Bedroom 3 Width13
Bedroom 4 Area242
Bedroom 4 FeaturesCarpet
Bedroom 4 Length22
Bedroom 4 LevelUpper
Bedroom 4 Width11
Bedroom 5 Area195
Bedroom 5 FeaturesCarpet
Bedroom 5 Length15
Bedroom 5 LevelUpper
Bedroom 5 Width13
Master Bedroom Area416
Master Bedroom Length26
Master Bedroom Width16
Primary Bedroom FeaturesCarpet
Primary Bedroom Level: First Floor210
Second Bedroom Length15
Second Bedroom LevelUpper
Second Bedroom Width14
Total Bedrooms7

Bathrooms

3/4 Baths1
Half Baths1
Master Bathroom FeaturesTub+Shower Primary, Luxury Features Primary Bath, 5 Piece Primary Bath
Total Baths5

Kitchen

Kitchen Area256
Kitchen FeaturesWood Floor
Kitchen Length16
Kitchen LevelMain
Kitchen Width16

Other Interior Features

LivingAreaSourceAssessor
Above Grade Finished Area4798
Air Conditioning Y/NYes
BasementFull, Daylight
Below Grade Finished Area2190
Fireplace FeaturesGas
Fireplace Y/NYes
FlooringWood Floors
Heating Y/NYes
Interior AmenitiesStudy Area, Eat-in Kitchen, Separate Dining Room, Cathedral/Vaulted Ceilings, Open Floorplan, Pantry, Walk-In Closet(s), Kitchen Island
Laundry FeaturesMain Level
Window FeaturesWood Frames

Other Rooms

Dining Room Area15
Dining Room Area210
Dining Room FeaturesWood Floor
Dining Room LevelMain
Dining Room Width14
Kitchen Area256
Kitchen FeaturesWood Floor
Kitchen Length16
Kitchen LevelMain
Kitchen Width16
Living Room Area702
Living Room FeaturesWood Floor
Living Room Length27
Living Room LevelMain
Living Room Width26

General for 3633 21st St

AccessibilityLevel Lot, Level Drive, Low Carpet
AppliancesGas Range/Oven, Dishwasher, Refrigerator, Washer, Dryer
Architectural StyleContemporary/Modern
Attached Garage Yes
CityBoulder
Construction MaterialsWood/Frame
CoolingRoom Air Conditioner, Ceiling Fan(s)
CountyBoulder
ElectricElectric, Xcel
Elementary SchoolColumbine
ExclusionsSellers personal property and any staging items
Facing DirectionSouth
Full Baths3
Garage Spaces3
Garage Y/NYes
Gas Y/NNatural Gas, Xcel
HOANo
HeatingHot Water, Zoned, Radiant
High SchoolBoulder
High School DistrictBoulder Valley Dist RE2
Land Lease Y/NNo
LevelsTri-Level
Living Area UnitsSquare Feet
Lot Size Square Feet35311
Lot Size UnitsSquare Feet
MLS AreaBoulder
Middle/Junior High SchoolCentennial
New ConstructionYes
Patio/Porch FeaturesPatio, Deck
Possible UseSingle Family
Primary Bedroom LevelUpper
Property Attached Y/NNo
Property ConditionNew Construction
Property SubtypeResidential-Detached
Property TypeResidential
RoofComposition
Senior Community Y/NNo
SewerCity Sewer
Standard StatusActive
StatusActive
Stories3
Subdivision Name21st/Linden Sub
Tax Annual Amount29936
Tax Year2024
UtilitiesNatural Gas Available, Electricity Available
ViewFoothills View
Virtual TourClick here
Waterfront Y/NNo
Year Built2024
ZoningRES

Exterior for 3633 21st St

Building Area Total4798
Covered Spaces3
FencingPartial, Security
Horse Y/NNo
Lot FeaturesLawn Sprinkler System, Wooded, Level
Lot Size Acres0.81
Lot Size Area35311
Parking FeaturesOversized
SpaNo
Water SourceCity Water, City of Boulder

Additional Details

Price History

Schools

Elementary School Columbine Elementary School
High School Boulder High School
Middle School Centennial Middle School

Jon Holsten

Price $11,500,000
MLS#1031592
List Date 04/18/2025
Property Type Single Family
Phone 970.237.2752
Request Tour
Request Info
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