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$10,000,000

Listing Price

7beds

4.25baths

6,988sqft

35,311sqft lot

3633 21st St, Boulder, CO 80304

Member Features

Find Real Estate Bargain!

  • Full foreclosure details

  • Home value, equity and ownership info

  • Find homes priced below market

  • Get full access with a FREE Account

Already a member?

For Sale

Off Market

Single Family

Home type

1640.63

Price / sqft

1987

Year built

Home Details

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 B

Interior Details

Square Feet
  • 6988

Bedrooms
  • 7

Bathrooms
  • 4.25

Heating
  • Has Heating:

    Yes

  • Heating Type:

    Hot Water

Cooling
  • Has Cooling:

    Yes

  • Cooling Type:

    Evaporative

Fuel
  • Has Fuel:

    No

  • Fuel Type:

    N/A

Basement
  • Has Basement:

    No

  • Basement Type:

    Partial

Flooring
  • Has Flooring:

    No

  • Flooring Type:

    N/A

Fireplace
  • Has Fireplace:

    Yes

  • Fireplace Type:

    N/A

Property Details

Lot Size
  • 35311

Water
  • No

Sewer
  • No

Parking
  • Type:

    Garage, Attached

  • Location:

    N/A

  • Status:

    N/A

  • Number of Spaces:

    3

Deck
  • No

Patio
  • No

Fence
  • No

Pool
  • No

Porch
  • Yes

Stoop
  • No

Breezeway
  • No

Construction Details

Number of Stories
  • 2

Style
  • A-frame

Exterior
  • Wood Shingle

Foundation
  • N/A

Roof
  • N/A

Roofing Material
  • Other (not Classified)

Tax History

Year

Amount

Land

Improvement

Percent Change

Assessment

2019

$22,062

$83,727

$173,674

--%

$257,401

2019

$22,062

$83,727

$173,674

--%

$257,401

2018

$18,273

$84,312

$126,454

--%

$210,766

2017

$17,701

$84,312

$126,454

--%

$210,766

2016

$16,537

$70,287

$120,753

--%

$191,040

2014

$11,330

$64,635

$67,148

--%

$131,783

2013

$11,080

$64,635

$67,148

--%

$131,783

2012

$11,916

$39,720

$102,525

--%

$142,245

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Average Home Price in 80304

Nearby Properties

Zip Code

Price

Bed

Bath

Sqft

Lot

Sold Date

$6,500,000

7 Beds

5 Baths

7,124 Sqft

23,030 Lot (sqft)

Sold 06/02/2026

$12,000,000

4 Beds

1 Baths

6,300 Sqft

28,700 Lot (sqft)

Sold 02/11/2026

$3,495,000

5 Beds

5 Baths

6,181 Sqft

18,592 Lot (sqft)

Sold 10/13/2026

$10,000,000

7 Beds

4.25 Baths

6,988 Sqft

35,311 Lot (sqft)

Sold 02/06/2026

percent-home-icon

Calculators

Mortgage

Mortgage Calculator

Calculate your monthly mortgage payments.
Household Income
70,000
$
Home price
10,000,000
$
Down payment
2,000,000
$
Mortgage Rate
6.5
%
Loan Term
Property Tax Rate
1.1
%
Homeowner's Insurance (Annual)
60,000
$
HOA (Monthly)
0
$
PMI
0
$
$64,732
Your Payment
Total Monthly Payment:$64,732
Percent of Income:1110%
Affordable:No

Details for 3633 21ST ST

Property Debt

Foreclosure Contact Details

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