3633 21st Street Boulder, CO ^$ 8,950,000

3633 21st Street

^$ 8,950,000

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Recently Listed

3633 21st Street

Boulder, CO, 80304

^$ 8,950,000

Bedrooms7 Baths4.1 Sq 6,988

Monthly Estimate*

^$ 61,815

Listed by The Agency - Boulder

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Single Family Home for sale in Boulder, CO

for $8,950,000 with 7 bedrooms and 4 full baths, 1 half bath. This 6,988 square foot home was built in 2024 on a lot size of 0.81.

Exquisite secluded sanctuary in the heart of Carolyn Heights. Tucked into one of Boulder's most prestigious enclaves, this gated 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. Awaken each morning as you do in your favorite boutique hotel; surrounded by nature and peace. 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.

Single Family Active

Price

^$ 8,950,000

Bedrooms

Full Bath

Half Bath

Property Type

Single Family

Taxes

^$ 29,641

Style

Contemporary

Lot Size

0.81

Year Built

2024

Town/City

Boulder

County/Region

Boulder

MLS | Web ID

IR1070740

Features

General

Living Area 6988

Sewer Public Sewer

Heating Hot Water Radiant

Cooling Ceiling Fan(s) Central Air

Utilities Cable Available Electricity Available Internet Access (Wired) Natural Gas Available

Roof Composition

Appliances Dishwasher Disposal Dryer Microwave Oven Refrigerator Washer

Zoning RR-1

Garage Spaces 3

Patio/Porch Features Deck Patio

Architectural Style Contemporary

Construction Materials Wood Frame

Year Built 2024

View Mountain(s)

Levels Tri-Level

Property Subtype Single Family Residence

Parcel Number R0004105

County Boulder

Property Type Residential

HOA N

Attached Garage Y

Subdivision Name 21st/Linden Sub

Facing Direction South

Possible Use Residential

Full Baths 3

High School Boulder

City Boulder

Senior Community Y/N N

High School District Boulder Valley RE 2

Lot Size Square Feet 35311

Elementary School Columbine

Property Attached Y/N N

Tax Annual Amount 29641

Middle/Junior High School Centennial

Virtual Tour https://iframe.videodelivery.net/f271dca7230a2e4d589c9d3aa3847a24

Standard Status Active

Elementary School District Boulder Valley RE 2

Freehold IDX

Interior

Interior Amenities Eat-in Kitchen Five Piece Bath Kitchen Island Open Floorplan Pantry Vaulted Ceiling(s) Walk-In Closet(s)

Basement Daylight Full

Flooring Tile Wood

Fireplace Features Gas

Window Features Skylight(s)

Half Baths 1

3/4 Baths 1

Total Bedrooms 7

Total Baths 5

Exterior

Fencing Fenced Partial

Parking Features Oversized

Lot Features Level Sprinklers In Front

Water Source Public

Lot Size Acres 0.81

* Excluded Features

List By

The Agency - Boulder

Broker

7203941997

Contact

Affordability Calculator

$64,286

Per Month

Monthly Principal & Interest: $61,815
Monthly Property Taxes: $2,470
Monthly Home Insurance: --

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Default based on a 30-year fixed rate of 7.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

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Nearby

Trends
Schools

Single family listings in Boulder, CO

Average List Price ^$2,227,807

Percent of Sale Price 75%

About Boulder, CO

102,151 Population

6% Since 2002

^$65,436 Median Income

31.88 Median Age

18% Households with Children

View more area information

Trends Information provided by ATTOM Data Solutions.

1956606 Elementary School

1955871 Middle School

Boulder High School High School

See complete school information

Pricing History

Date	Price	Price Change	Description
10/16/2026	$8,950,000		Listed Price

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3633 21st Street, Boulder, CO, 80304 is a Single Family Home for sale at $8,950,000 with 6,988 sqft and a lot size of 0.81. 3633 21st Street has 7 bedrooms, 4.1 baths, and was built in 2024. The property's zip code is 80304 which is in Boulder, CO

*Information deemed reliable but not guaranteed.

Financial calculator disclaimer: Default based on a 30-year fixed rate of 7.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

The data relating to real estate on this web site comes in part from the Internet Data eXchange (IDX) Program of the REcolorado. Real estate listings held by firms other than Weichert Realtors are marked with the IDX logo and detailed information about them includes the Listing Broker’s Firm Name.

The information being provided is for consumers personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

Data is updated as of 10/17/2026.

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3633 21st Street

Single Family Home for sale in Boulder, CO

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