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3633 21st StreetBoulder, CO 80304

For Sale

$11,500,000

Smart Buyer Rebate $115,000

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! Original home built in 1987. Home had a studs up remodel that was completed in early 2024.

Listed by Marybeth Emerson

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License #IRP28512

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The Agency - Boulder

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720-394-1997

Last updated July 11, 2025

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Source: REcolorado #IR1031592

Listing Facts

  • TypeSingle-family
  • NeighborhoodCarolyn Heights
  • Bedrooms7
  • Bathrooms5
  • Days on Prevu142
  • Taxes$29,936/year
  • Size6,988 sqft
  • Price per sqft$1,646

Amenities

  • Dishwasher
  • Private Outdoor Space
  • Washer/Dryer
  • Parking

Location

Mortgage Calculator

Listing History

04/18/2025
Listed by The Agency - Boulder
$11,500,000

Property Details for 3633 21st Street

Exterior

Construction

  • Property Condition: New Construction
  • Roof: Composition
  • Structure Type: House
  • Year Built: 2024
  • Architectural Style: Contemporary
  • Construction Materials: Frame

Features

  • Direction Faces: South
  • Fencing: Fenced, Partial
  • Patio And Porch Features: Deck, Patio
  • View: Mountain(s)

Measurements

  • Building Area Total: 6,988
  • Lot Features: Level, Sprinklers In Front
  • Lot Size Acres: 0.81
  • Lot Size Square Feet: 35,311

Financial

Taxes

  • Parcel Number: R0004105
  • Tax Annual Amount: $29,936.00
  • Tax Year: 2024

Interior

Features

  • Appliances: Dishwasher, Dryer, Oven, Refrigerator, Washer
  • Fireplace Features: Gas
  • Flooring: Tile, Wood
  • Interior Features: Eat-in Kitchen, Five Piece Bath, Kitchen Island, Open Floorplan, Pantry, Vaulted Ceiling(s), Walk-In Closet(s)

Measurements

  • Living Area: 6,988

Rooms

  • Basement: Daylight, Full
  • Has Basement: Yes
  • Bathrooms Full: 3
  • Bathrooms Half: 1
  • Bathrooms Three Quarter: 1
  • Bathrooms Total Integer: 5
  • Bedrooms Total: 7
  • Main Level Bathrooms: 1

Other

General

  • Exclusions: Sellers personal property and any staging items

Location

  • Subdivision Name: 21st/Linden Sub

Parking

Parking

  • Attached Garage: Yes
  • Garage Spaces: 3
  • Parking Features: Oversized
  • Parking Total: 3

Schools

Elementary School

  • Elementary School: Columbine
  • Elementary School District: Boulder Valley RE 2

High School

  • High School: Boulder
  • High School District: Boulder Valley RE 2

Middle or Junior School

  • Middle Or Junior School: Centennial

Utilities

Equipment

  • Cooling: Air Conditioning-Room, Ceiling Fan(s)
  • Heating: Hot Water, Radiant
  • Sewer: Public Sewer
  • Utilities: Electricity Available, Natural Gas Available
  • Water Source: Public

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Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.