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3633 21ST ST, BOULDER, CO 80304

3633 21ST ST, BOULDER, CO 80304

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Home > Listings > 3633 21ST ST, BOULDER, CO 80304

3633 21st St Boulder, CO 80304

LISTING #1051043
LISTING OFFICE OF 7203941997

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!

$10,000,000

  • BEDS: 7
  • BATHS: 3 | 2
  • STATUS: Active
  • YR. BUILT: 2024
  • GARAGE: 3
  • SQFT.: 6,988
  • PROPERTY TYPE: house
Property Details

Location Information +

  • County Boulder
  • Latitude 40.041762
  • Longitude -105.271466
  • Subdivision 21st/Linden Sub

Interior Features +

  • Interior Eat-in Kitchen, Separate Dining Room, Cathedral Ceiling(s), Open Floorplan, Pantry, Wood Windows, Walk-In Closet(s), Skylights, Kitchen Island
  • Full Baths 3
  • 3/4 Baths 1
  • 1/2 Baths 1
  • Has Fireplace Yes
  • Fireplace Description Gas
  • Heating Hot Water, Zoned, Radiant
  • Cooling Wall/Window Unit(s), Ceiling Fan(s)
  • Floors Wood
  • Appliances Gas Range, Dishwasher, Refrigerator, Washer, Dryer, Microwave, Disposal, Fire Alarm
  • Basement Description Full, Daylight
  • Accessibility Level Lot, Level Drive, Low Carpet
  • Living Area 6988

Exterior Features +

  • Style Contemporary
  • Stories Tri-Level
  • Is New Construction Yes
  • Construction Frame
  • Roof Composition
  • Water Source City
  • Septic or Sewer Public Sewer
  • Electric XCEL
  • Utilities Natural Gas Available, Electricity Available
  • Gas XCEL
  • Parking Description Attached
  • Has Garage Yes
  • Garage Spaces 3
  • Fencing Partial, Security
  • Patio / Deck Description Patio, Deck
  • Lot Features Wooded, Evergreen Trees, Deciduous Trees, Level, House Faces South
  • Lot Size in Acres 0.81
  • Lot Size in Sq. Ft. 35,311
  • Possible Best Use Single Family
  • Zoning RES
  • Condition New, Completed
  • Garage Description Attached
  • Outdoor Sprinkler System, Oversized Garage
  • View Description Hills
  • Windows/Doors Description Skylight(s)

School +

  • School District Boulder Valley Dist RE2
  • Elementary School Columbine
  • Middle School Centennial
  • High School Boulder

Additional Information +

  • Property Type SFR
  • Property SubType Single Family Residence
  • Year Built 2024
  • Status Active
  • Tax Year 2025
  • Tax Amount $29,641
  • Exclusions Sellers personal property and any staging items
  • Living Area Source Assessor
  • Listing Office of 7203941997
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  • IRES data last updated at May 12, 2026, 8:28 PM MT
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