Property
ActiveResidential
1/39
$10,000,000

3633 21st Street

Boulder, CO 80304
7
Beds
5
Baths
6,988
SqFt
0.81
Acres
RECOLORADO
#IR1051043
Updated: Jun 2, 2026, 4:30pm

Property Description

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 minutes 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! Original home built in 1987. Home had a studs up remodel that was completed in early 2024.
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Included Appliances
DishwasherDisposalDryerMicrowaveOvenRefrigeratorWasher

Property Details

Interior
Above Grade Finished Area
4798
Appliances
DishwasherDisposalDryerMicrowaveOvenRefrigeratorWasher
Basement
DaylightFull
Below Grade Finished Area
2190
Building Area Total
6988
Cooling
Air Conditioning-RoomCeiling Fan(s)
Fireplace Features
Gas
Flooring
TileWood
H V A C Description
Wall/Window Unit(s),Ceili
Heating
Hot WaterRadiant
Interior Features
Eat-in KitchenFive Piece BathKitchen IslandOpen FloorplanPantryVaulted Ceiling(s)Walk-In Closet(s)
Living Area
6988
Room Count
17
Security Features
Fire Sprinkler SystemSmoke Detector(s)
Window Features
Skylight(s)
Construction
Architectural Style
Contemporary
Building Area Source
Assessor
Construction Materials
Frame
Direction Faces
South
Levels
Tri-Level
Property Condition
New Construction
Roof
Composition
Structure Type
House
Year Built
2024
Site & Exterior
Fencing
FencedPartial
Garage Spaces
3
Lot Features
LevelSprinklers In Front
Lot Size Acres
0.81
Lot Size Square Feet
35311
Parking Features
Oversized
Parking Total
3
Patio And Porch Features
DeckPatio
Sewer
Public Sewer
Utilities
Electricity AvailableNatural Gas Available
Vegetation
Wooded
View
Mountain(s)
Water Source
Public
Zoning
RES
Financials
Contract Earnest Check To
First American Title - Angie Mansfield
Contract Min Earnest
250000.00
Exclusions
Sellers personal property and any staging items
Ownership
Individual
Parcel Number
R0004105
Tax Annual Amount
29641
Tax Legal Description
LOT 1 21ST/LINDEN SUB
Tax Year
2025

Neighborhood & Lifestyle

Community & Association
Subdivision Name
21st/Linden Sub
Schools
Ratings
Elementary
Columbine
Middle
Centennial
High
Boulder
Elem. District
Boulder Valley RE 2
High District
Boulder Valley RE 2
Listing provided courtesy of RECOLORADO via IDX. Updated: Jun 2, 2026, 4:30pm.
Marybeth Emerson

Listing Agent

The Agency - Boulder

Call Agent