3633 21st Street Boulder, CO ^$ 10,000,000

3633 21st Street

^$ 10,000,000

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Recently Listed New Construction

3633 21st Street

Boulder, CO, 80304

^$ 10,000,000

Bedrooms7 Baths4.1 Sq 6,988

Monthly Estimate*

^$ 61,572

Listed by The Agency - Boulder

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Single Family Home for sale in Boulder, CO

for $10,000,000 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 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.

Single Family Active

Price

^$ 10,000,000

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

IR1051043

Features

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

Basement (Y/N) Y

Window Features Skylight(s)

Above Grade Finished Area 4798

Half Baths 1

3/4 Baths 1

Total Bedrooms 7

Below Grade Finished Area 2190

Main Level Bedrooms 0

Main Level Bathrooms 1

Total Baths 5

General

Sewer Public Sewer

Heating Hot Water Radiant

Cooling Air Conditioning-Room Ceiling Fan(s)

Utilities Electricity Available Natural Gas Available

Possession Closing/DOD

Roof Composition

Appliances Dishwasher Disposal Dryer Microwave Oven Refrigerator Washer

Zoning RES

Garage Spaces 3

Patio/Porch Features Deck Patio

Architectural Style Contemporary

Security Features Fire Sprinkler System Smoke Detector(s)

Construction Materials Frame

Exclusions Sellers personal property and any staging items

Year Built 2024

View Mountain(s)

Levels Tri-Level

Property Subtype Single Family Residence

Tax Year 2025

Ownership Individual

County Boulder

Property Type Residential

HOA N

Attached Garage Y

Subdivision Name 21st/Linden Sub

Facing Direction South

Possible Use Residential

Full Baths 3

Status Active

High School Boulder

City Boulder

High School District Boulder Valley RE 2

Lot Size Square Feet 35311

Listing Terms Cash Conventional

Elementary School Columbine

Tax Annual Amount 29641

Middle/Junior High School Centennial

Property Condition New Construction

Concessions No

Virtual Tour https://vimeo.com/1076220353

Structure Type House

Standard Status Active

Occupancy Type Owner

Elementary School District Boulder Valley RE 2

Exterior

Vegetation Wooded

Fencing Fenced Partial

Parking Features Oversized

Lot Features Level Sprinklers In Front

Water Source Public

Total Parking 3

Building Area Total 6988

Lot Size Acres 0.81

Internal Only

Street Number 1 3633

* Excluded Features

List By

The Agency - Boulder

Broker

(720) 394-1997

Phone

Affordability Calculator

$64,042

Per Month

Monthly Principal & Interest: $61,572
Monthly Property Taxes: $2,470
Monthly Home Insurance: --

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Yearly Home Insurance

Default based on a 30-year fixed rate of 6.25% 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 ^$2,815,901

Percent of Sale Price 72%

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
2/6/2026	$10,000,000		Listed Price

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3633 21st Street, Boulder, CO, 80304 is a Single Family Home for sale at $10,000,000 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 6.25% 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 2/7/2026.

This publication is designed to provide information with regard to the subject matter covered. It is displayed with the understanding that the publisher and authors are not engaged in rendering real estate, legal, accounting, tax, or other professional services and that the publisher and authors are not offering such advice in this publication. If real estate, legal, or other expert assistance is required, the services of a competent, professional person should be sought.

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PUBLISHER’S NOTICE: All real estate advertised herein is subject to the Federal Fair Housing Act and the Colorado Fair Housing Act, which Acts make it illegal to make or publish any advertisement that indicates any preference, limitation, or discrimination based on race, color, religion, sex, handicap, familial status, or national origin.

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3633 21st Street

Single Family Home for sale in Boulder, CO

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