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For Sale

3633 21st St

3633 21st St, Boulder, CO 80304

$11,500,000
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!

7
beds

5
baths

6,988 Sq.Ft. LIVING AREA

0.81 Acres lot

Marybeth Emerson

Marybeth Emerson

Features & Amenities

Interior

  • total bedrooms7
  • Total bathrooms5
  • full bathrooms3
  • three quarter bathroom1
  • half bathroom1
  • Laundry room Main Level
  • Flooring Wood Floors
  • Fireplace Gas
  • APPLIANCES Gas Range/Oven, Dishwasher, Refrigerator, Washer, Dryer
  • other interior Features Study Area, Eat-in Kitchen, Separate Dining Room, Cathedral/Vaulted Ceilings, Open Floorplan, Pantry, Walk-In Closet(s), Kitchen Island

Area & Lot

  • Status For Sale
  • Living Area6,988 Sq.Ft.
  • Total Area4,798 Sq.Ft.
  • Lot Area0.81 Acres
  • MLS® ID1031592
  • TypeResidential
  • YEAR BUILT2024
  • Architecture StylesContemporary/Modern
  • View DescriptionFoothills View
  • Elementary SchoolColumbine
  • Middle SchoolCentennial
  • High SchoolBoulder
  • School DistrictBoulder Valley Dist RE2

Exterior

  • STORIES3
  • Garage Space3.0
  • water SourceCity Water, City of Boulder
  • utilitiesNatural Gas Available, Electricity Available
  • roofComposition
  • lot featuresLawn Sprinkler System, Wooded, Level
  • parkingOversized
  • HEAT TYPEHot Water, Zoned Heat, Radiant
  • AIR CONDITIONINGWall/Window Unit(s), Ceiling Fan(s)
  • sewerCity Sewer
  • Disability FeaturesLevel Lot, Level Drive, Low Carpet

Financial

  • Sales Price$11,500,000
  • Real Estate Tax $29,936/yr
  • Zoning RES
3633 21st St
3633 21st St

Tucked into one of Boulder's most prestigious enclaves, this estate offers a rare fusion of luxury, privacy, and relaxed sophistication.

– Marybeth Emerson
3633 21st St
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Schedule a Showing

I would love to show you my beautiful property. Please select your preferred date and time below. I will be in touch shortly to confirm your appointment.

Schedule a Showing

I would love to show you my beautiful property. Please select your preferred date and time below. I will be in touch shortly to confirm your appointment.

Thank you for your interest in 3633 21st St, Boulder, CO 80304. We are reviewing your request and will be in touch shortly!

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Connect with Marybeth

With over $700 million in career sales and Boulder’s two highest-ever recorded residential closings, Marybeth Emerson stands as one of Colorado’s top luxury real estate authorities. A Chairman Agent and Developer with The Agency Boulder, Marybeth blends market expertise, design vision, and deep local roots to deliver an unparalleled client experience. Whether buying, selling, or developing, her results speak for themselves — record-setting sales, trusted relationships, and a reputation for turning the impossible into the extraordinary.

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