Backup offers
$10,000 Closing Credit¹
#IR1025620, Susan Baca, Listing Office: RE/MAX of Boulder, Inc
#IR1031592·
Listing office: The Agency - Boulder·
Listing agent: Marybeth Emerson·
Listing office phone: 7203941997
$11,500,000 List price
3633 21st St Boulder, CO 80304
7 beds
3 full, 2 partial
6,988 sqft
0.8 acres
$1,646 / sqft
House
Property details
About 3633 21st St
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.
Highlights
Home typeSingle Family Residence
HeatingHot Water, Radiant
StatusActive
CoolingAir Conditioning, Ceiling Fan(s)
Size6,988 sqft
BasementYes
Lot size0.81 Acres
Year builtNew Const., 2024
ParkingOversized
MLS #IR1031592
Attached garage3 spaces
FireplaceGas
ViewMountain(s)
Virtual tour
Summary
- MLS Number: IR1031592
- MLS Name: RECOLORADO
- Office Name: The Agency - Boulder
- Office Phone: (720) 394-1997
- Listing Agent: Marybeth Emerson
Listings courtesy of REColorado as distributed by MLS GRID.
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6455 S. Yosemite St., Suite 300
Greenwood Village, CO 80111 USA
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Last updated on: 4/24/2025, 1:57:49 AM Eastern. If you have any questions regarding the accuracy of this data, please contact us at help@rockethomes.com.
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$11,500,000
3633 21st St
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Seller rebate
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Price information
Property sales
| Date | Event | Price |
|---|---|---|
| Jan 20, 2022 | Home Sold | $4,500,000 |
| Sep 11, 2017 | Home Sold | $3,500,000 |
| Apr 18, 2014 | Home Sold | $2,550,000 |
| Jun 03, 2011 | Home Sold | $1,735,000 |
Tax history
| Year | Assessment | Property Tax |
|---|---|---|
| 2023 | $340,876 | $29,119 |
| 2022 | $246,976 | $22,935 |
| 2021 | $254,083 | $21,870 |
| 2020 | $257,401 | $22,405 |
| 2019 | $259,200 | $18,273 |
| 2018 | $210,766 | $17,701 |
| 2017 | $210,766 | $16,537 |
History based on county public records data.
Nearby schools
5
Columbine Elementary School
Public District PK-5
0.7 mi
•3130 Repplier St
7
Crest View Elementary School
Public District KG-5
0.7 mi
•1897 Sumac Ave
8
Foothill Elementary School
Public District KG-5
0.8 mi
•1001 Hawthorn Ave
School ratings are a score out of 10, where 10 is the highest and 1 is the lowest.
Neighborhood
The neighbors living near this home have an average income of $123,370. The majority of Boulder, CO residents have income between $100k-200k annually. Typical family type is married, no kids. Typical level of education for residents in this area is masters degree.
How much money do the neighbors make?
12%
<35k
27%
35k-100k
31%
100k-200k
30%
200k+
What level of education do the neighbors have?
High School Diploma
Post Secondary Degree
Masters Degree
Doctorate
What types of families live nearby?
32%
Single, No Kids
4%
Single, with Kids
41%
Married, No Kids
23%
Married, with Kids
Are the neighbors home owners or renters?
Home Owners
Renters
How old are people in this area?
12%
<11 yrs old
7%
12-17 yrs old
13%
18-34 yrs old
49%
35-64 yrs old
19%
65+ yrs old
What do the neighbors do for fun?
Skiing/snowboarding
Men's Tennis
PGA/LPGA
Where do the neighbors shop?
Nordstrom
Bloomingdales
Chico's
Where do the neighbors go to eat?
California Pizza Kitchen
Bonefish Grill
Chipotle
What do the neighbors drive?
BMW
Lexus
Cadillac
What do the neighbors listen to?
Talk/Personality
News
Classical
All data provided by Home Junction and Claritas
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Frequently asked questions
About 3633 21st St
This home is located at 3633 21st St in Boulder, CO and zip code 80304 in the Carolyn Heights neighborhood. This 6,988 square foot home, which was built in 2024, sits on a 0.81 acre lot. Features: 7 bedrooms, 5 bathrooms. It has been listed on Rocket Homes since April 18, 2025 and is currently priced at $11,500,000.
While more than 13 listings in Boulder, CO in March 2025 were sold above asking price, there were more than 26 listings sold at asking price, and more than 69 were sold below. The inventory of homes for sale in Boulder, CO between February and March 2025 increased by 33.2%. In March 2025, listings were on the market for 51 days. During the same period, the median list price in this real estate market was $982,256.
From Rocket Homes Real Estate and based on county public records data.