3621 21st Street
Boulder, CO, 80304 $ 12,000,000
Bedrooms4 Baths4.1 Sq 6,300 Monthly Estimate*
$ 82,881
Listed by Compass - Boulder
for $12,000,000 with 4 bedrooms and 4 full baths, 1 half bath. This 6,300 square foot home was built in 2021 on a lot size of 0.66.
Meticulously crafted, masterfully built, and expertly curated with an elevated design, this custom home is a true masterpiece, perfectly situated on a premier lot in the exclusive Carolyn Heights neighborhood, The exquisite design and inspiring architecture of this exceptional residence ensures that every facet embodies luxury, casual elegance, and attention to detail, harmoniously blending wood, glass, stone, and steel to create an ambiance that is both inviting and inspiring. Upon entry, you'll be greeted by soaring ceilings, wide plank white oak flooring, & an open-concept main level bathed in abundant natural light streaming through expansive windows, inviting the outside in. The prodigious living area seamlessly integrates indoor & outdoor spaces, offering a glimpse of the splendid living experience that awaits. The architectural grandeur is showcased w/ a dramatic three-story open-tread wooden staircase, custom steel railings, & illuminated by bespoke lighting. The centerpiece of the home, the gourmet kitchen, boasts an impressive center island, marble & quartz countertops, artisanal tile, custom cabinetry, top-tier chef's appliances, & walk-in pantry. The elegant main floor primary bedroom suite is a tranquil retreat, w/ wall-to-wall windows, a generous walk-in closet w/custom cabinetry. The soothing primary bathroom features premium quality finishes, including designer tile, custom cabinetry, & alluring lighting.The heated pool w/ a tanning shelf, natural stone deck, & automatic pool cover takes center stage in the serene yard. Every aspect of this smart home seamlessly integrates technology, design, & automation to ensure security & convenience, and efficiency. For the discerning owner desiring a residence that embodies casual elegance & architectural interest, w/proximity to vibrant downtown Boulder & nestled in an upscale neighborhood, this property is a rare find that offers an unsurpassed lifestyle.
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FeaturesGeneralLiving Area 6300
Sewer Public Sewer
Heating Radiant
Cooling Central Air
Utilities Cable Available Electricity Available Internet Access (Wired) Natural Gas Available
Roof Composition
Appliances Bar Fridge Dishwasher Disposal Double Oven Dryer Freezer Microwave Oven Refrigerator Trash Compactor Washer
Zoning RES
Garage Spaces 3
Patio/Porch Features Patio
Architectural Style Contemporary
Pool Features Private
Construction Materials Block Brick Stone Wood Frame
Year Built 2021
Levels Two
Property Subtype Single Family Residence
Parcel Number R0004965
County Boulder
Property Type Residential
HOA N
Attached Garage Y
Subdivision Name Carolyn Heights
Facing Direction East
Possible Use Residential
Full Baths 1
High School Boulder
City Boulder
Senior Community Y/N N
High School District Boulder Valley RE 2
Lot Size Square Feet 28700
Elementary School Crest View
Property Attached Y/N N
Tax Annual Amount 55752
Middle/Junior High School Centennial
Virtual Tour https://youtu.be/Us9ESmi2pfs
Standard Status Active
Elementary School District Boulder Valley RE 2
Freehold IDX
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InteriorInterior Amenities Eat-in Kitchen Five Piece Bath Kitchen Island Open Floorplan Pantry Vaulted Ceiling(s) Walk-In Closet(s) Wet Bar
Basement Full
Flooring Tile Wood
Fireplace Features Gas Living Room
Window Features Double Pane Windows Window Coverings
Half Baths 1
3/4 Baths 3
Laundry Features In Unit
Total Bedrooms 4
Total Baths 5
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ExteriorExterior Amenities Dog Run Gas Grill Spa/Hot Tub
Parking Features Heated Garage Oversized
Lot Features Level Sprinklers In Front
Water Source Public
Lot Size Acres 0.66
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* Excluded FeaturesAffordability Calculator
- Monthly Principal & Interest
- $82,881
- Monthly Property Taxes
- $4,646
- Monthly Home Insurance
- --
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.
Learn more about how to save NearbySingle family listings in Boulder, CO
Average List Price $2,213,629
Percent of Sale Price 82%
About Boulder, CO 102,151 Population
6% Since 2002
$ 65,436 Median Income
31.88 Median Age
18% Households with Children
Trends Information provided by ATTOM Data Solutions.
1955828 Elementary School
1955871 Middle School
Boulder High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 2/28/2026 | $12,000,000 | -7.69% | Price Down |
| 2/12/2026 | $13,000,000 | | Listed Price |