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Single family home for sale at 3633 21st Street, Boulder, CO 80304 | MLS# IR1070740 | Listing updated on 2026-10-20
Photo 1 of Single family home for sale at 3633 21st Street, Boulder, CO 80304 | MLS# IR1070740 | Listing updated on 2026-10-20
Photo 2 of Single family home for sale at 3633 21st Street, Boulder, CO 80304 | MLS# IR1070740 | Listing updated on 2026-10-20
Photo 3 of Single family home for sale at 3633 21st Street, Boulder, CO 80304 | MLS# IR1070740 | Listing updated on 2026-10-20
Photo 4 of Single family home for sale at 3633 21st Street, Boulder, CO 80304 | MLS# IR1070740 | Listing updated on 2026-10-20
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$8,950,000

Monthly Est:$44,547

  • Beds Icon7 Beds
  • Beds Icon
    5 Baths
  • Beds Icon6,988sqft

3633 21st Street, Boulder, CO 80304

$44,547/moEst:

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  • Single Family Residence

  • Built in 2024

  • $-- HOA

  • 35,311 sqft lot

  • $1,281/sq.ft

Description

Exquisite secluded sanctuary in the heart of Carolyn Heights. Tucked into one of Boulder's most prestigious enclaves, this gated 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. Awaken each morning as you do in your favorite boutique hotel; surrounded by nature and peace. 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.

  • Houzeo last checked: 4 hours ago
  • Listing updated: October 20, 2026 at 3:51 pm
  • Listing Provided by: Marybeth Emerson (720) 394-1997 | The Agency - Boulder (720) 577-5503
  • Source: DENVER (RE COLORADO) MLS-CO | MLS#: IR1070740 DENVER (RE COLORADO) MLS-CO

Property Details

  • Status

    Active

  • Type

    Single Family Residence

  • No. of Stories

    -

  • County

    Boulder County

  • City

    Boulder

  • Neighborhood

    --

  • Year Built

    2024

  • HOA Fees

    -

  • Finished Area

    6,988 sqft

  • Lot Size

    35,311 sqft lot

  • Basement Area

    - sqft

  • MLS Name

    DENVER (RE COLORADO) MLS

  • MLS Number

    IR1070740

  • MLS Status

    Active

  • Days on Market

    13

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Location

Facts & Features

Rooms

  • Bedrooms & bathrooms

    Bedrooms: 7

    Bathrooms: 5

  • Bathroom Full

    Level: Upper

  • Bathroom Full

    Level: Basement

  • Bathroom Full

    Level: Upper

  • Bathroom Half

    Level: Main

  • Bathroom Three Quarter

    Level: Upper

  • Kitchen

    Level: Main

    Area: Square Feet

    Dimensions: 256.00

  • Laundry

    Level: Main

    Area: Square Feet

    Dimensions: 140.00

  • Living Room

    Level: Main

    Area: Square Feet

    Dimensions: 702.00

  • Game Room

    Level: Lower

    Area: Square Feet

    Dimensions: 630.00

  • Office

    Level: Main

    Area: Square Feet

    Dimensions: 266.00

  • Bedroom

    Level: Upper

    Area: Square Feet

    Dimensions: 195.00

  • Bedroom

    Level: Upper

    Area: Square Feet

    Dimensions: 242.00

  • Bedroom

    Level: Upper

    Area: Square Feet

    Dimensions: 195.00

  • Bedroom

    Level: Lower

    Area: Square Feet

    Dimensions: 168.00

  • Dining Room

    Level: Main

    Area: Square Feet

    Dimensions: 210.00

  • Bedroom

    Level: Upper

    Area: Square Feet

    Dimensions: 210.00

  • Bedroom

    Level: Upper

    Area: Square Feet

    Dimensions: 416.00

Interior

  • Interior Features

    Eat In Kitchen, Five Piece Bath, Kitchen Island, Open Floorplan, Pantry, Vaulted Ceiling(s), Walk In Closet(s)

  • Window Features

    Skylight(s)

  • Cooling

    Ceiling Fan(s), Central Air

  • Appliances

    Dishwasher, Disposal, Dryer, Microwave, Oven, Refrigerator, Washer

  • Heating

    Hot Water, Radiant

  • Sewer

    Public Sewer

  • Flooring

    Tile, Wood

Construction

  • Year Built

    Year Built: 2024

  • Home type

    Single Family Residence

  • Property Condition

    New Construction

  • Architectural Style

    Contemporary

  • Roof

    Composition

  • Construction Materials

    Frame

Utilities & Energy

  • Fireplace Features

    Gas

  • Basement

    Daylight, Full

  • Parking Features

    Oversized

  • Security Features

    Fire Sprinkler System, Smoke Detector(s)

  • Water Source

    Public

  • Utilities

    Cable Available, Electricity Available, Internet Access (wired), Natural Gas Available

Other Features

  • Lot Features

    Level, Sprinklers In Front

  • Subdivision Name

    21st/linden Sub

  • Patio And Porch Features

    Deck, Patio

  • Vegetation

    Wooded

Price History

DateEventPrice

10/16/2026

Source: mls_logoDENVER (RE COLORADO) MLS-CO #RECIR1070740

Listed for Sale

$8,950,000 -10.50%

$1,281/sqft

08/02/2026

Source: mls_logoDENVER (RE COLORADO) MLS-CO #RECIR1051043

Listing Removed

$10,000,000

$1,431/sqft

02/06/2026

Source: mls_logoDENVER (RE COLORADO) MLS-CO #RECIR1051043

Listed for Sale

$10,000,000

$1,431/sqft

Getting Around 3633 21st Street

Bike Score®

Bike Score

Bikeable

69/100

Walk Score®

Walk Score

Car-Dependent

28/100

Transit Score®

Transit Score

Some Transit

40/100

Data provided by Redfin

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