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For sale
$12,000,000
4beds
7,099sqft

3621 21st St, Boulder, CO 80304

4beds
7,099sqft
Single family residence
Built in 2021
0.66 Acres
3 Attached garage spaces
$1,690 price/sqft

What's special

Automatic pool coverArtisanal tileNatural stone deckWalk-in pantryOpen-concept main levelCustom cabinetryCustom steel railings

Meticulously crafted, masterfully built, and expertly curated with an elevated design, this custom home is a true masterpiece, perfectly situated on a premier lot in the exclusive Carolyn Heights neighborhood, The exquisite design and inspiring architecture of this exceptional residence ensures that every facet embodies luxury, casual elegance, and attention to ...

147 days
|
1,553
|
56
|
Source: IRES as distributed by MLS GRID,MLS#: 1051395MLS Logo
Travel times

Kitchen

Living Room

Primary Bedroom

Outdoor 1

Foyer

Zillow last checked:

Listing updated:

Listed by:

Patricia Dessel 303-475-6097,

Compass - Boulder

Source: IRES as distributed by MLS GRID,MLS#: 1051395MLS Logo

Facts & features

Interior

Bedrooms & bathrooms
  • Bedrooms: 4
  • Bathrooms: 5
  • Full bathrooms: 1
  • 3/4 bathrooms: 3
  • 1/2 bathrooms: 1
  • Main level bathrooms: 2
Rooms
  • Room types: Media Room
Primary bedroom
  • Description: Wood
  • Features: Luxury Features Primary Bath, 5 Piece Primary Bath
  • Level: Main
  • Area: 289 Square Feet
  • Dimensions: 17 x 17
Bedroom 2
  • Description: Carpet
  • Level: Upper
  • Area: 204 Square Feet
  • Dimensions: 17 x 12
Bedroom 3
  • Description: Carpet
  • Level: Upper
  • Area: 240 Square Feet
  • Dimensions: 16 x 15
Bedroom 4
  • Description: Carpet
  • Level: Lower
  • Area: 256 Square Feet
  • Dimensions: 16 x 16
Dining room
  • Description: Wood
  • Level: Main
Kitchen
  • Description: Hardwood
  • Level: Main
  • Area: 350 Square Feet
  • Dimensions: 25 x 14
Laundry
  • Description: Tile
  • Level: Main
  • Area: 99 Square Feet
  • Dimensions: 9 x 11
Living room
  • Description: Wood
  • Level: Main
  • Area: 806 Square Feet
  • Dimensions: 31 x 26
Recreation room
  • Description: Wood
  • Level: Lower
  • Area: 400 Square Feet
  • Dimensions: 20 x 20
Study
  • Description: Wood
  • Level: Main
  • Area: 272 Square Feet
  • Dimensions: 16 x 17
Heating
  • Radiant
Cooling
  • Central Air
Appliances
  • Included: Gas Range, Double Oven, Dishwasher, Refrigerator, Bar Fridge, Washer, Dryer, Microwave, Trash Compactor, Freezer, Gas Bar-B-Q, Disposal
  • Laundry: Sink, Washer/Dryer Hookup
Features
  • Eat-in Kitchen, Cathedral Ceiling(s), Open Floorplan, Pantry, Walk-In Closet(s), Wet Bar, Kitchen Island, Steam Shower, High Ceilings, Split Bedroom Plan
  • Flooring: Wood
  • Windows: Window Coverings
  • Basement: Full
  • Has fireplace: Yes
  • Fireplace features: Gas, Living Room
Interior area
  • Total structure area: 4,544
  • Total interior livable area: 7,099 sqft
  • Finished area above ground: 4,544
Video & virtual tour

Property

Parking
  • Total spaces: 3
  • Parking features: Garage Door Opener, Attached, Heated Garage, Oversized
  • Attached garage spaces: 3
  • Details: Attached
Accessibility
  • Accessibility features: Level Lot, Level Drive, Accessible Doors, Main Floor Bath, Accessible Bedroom, Main Level Laundry
Features
  • Levels: Two
  • Stories: 2
  • Patio & porch: Patio
  • Exterior features: Sprinkler System
  • Has private pool: Yes
  • Pool features: Private
  • Spa features: Heated
  • Fencing: Fenced,Dog Run/Kennel
Lot
  • Size: 0.66 Acres
  • Features: Wooded, Evergreen Trees, Deciduous Trees, Native Plants, Level, City Limits, Paved
Details
  • Parcel number: R0004965
  • Zoning: RES
  • Special conditions: Private Owner

Construction

Type & style
  • Home type: SingleFamily
  • Architectural style: Contemporary
  • Property subtype: Single Family Residence
Materials
  • Frame, Brick, Block, Stone
  • Roof: Composition
Condition
  • New construction: No
  • Year built: 2021

Utilities & green energy

  • Electric: Xcel, Photovoltaics Seller Owned
  • Gas: Xcel
  • Sewer: Public Sewer
  • Water: City
  • Utilities for property: Natural Gas Available, Electricity Available, Cable Available, High Speed Avail
Green energy
  • Energy efficient items: Southern Exposure, Windows

Community & HOA

Community
  • Security: Fire Sprinkler System, Security System, Fire Alarm
  • Subdivision: Carolyn Heights
HOA
  • Has HOA: No
Location
  • Region: Boulder

Financial & listing details

  • Price per square foot: $1,690/sqft
  • Tax assessed value: $9,471,600
  • Annual tax amount: $55,752
  • Date on market: 2/12/2026
  • Listing terms: Cash,Conventional
  • Exclusions: Personal Property and Artwork
  • Electric utility on property: Yes
  • Road surface type: Asphalt

Price history

DateEventPrice
6/4/2026Listed for sale$12,000,000$1,690/sqft
Source: REcolorado as distributed by MLS GRID #IR1051395 Report a problem
5/22/2026Pending sale$12,000,000$1,690/sqft
Source: REcolorado as distributed by MLS GRID #IR1051395 Report a problem
2/28/2026Price change$12,000,000-7.7%$1,690/sqft
Source: IRES as distributed by MLS GRID #1051395 Report a problem
2/21/2026Pending sale$13,000,000$1,831/sqft
Source: REcolorado as distributed by MLS GRID #IR1051395 Report a problem
2/12/2026Listed for sale$13,000,000$1,831/sqft
Source: IRES as distributed by MLS GRID #1051395 Report a problem
12/8/2025Listing removed$13,000,000$1,831/sqft
Source: IRES as distributed by MLS GRID #1025368 Report a problem
1/31/2025Listed for sale$13,000,000$1,831/sqft
Source: IRES as distributed by MLS GRID #1025368 Report a problem
12/5/2024Listing removed$13,000,000$1,831/sqft
Source: IRES as distributed by MLS GRID #1019193 Report a problem
9/23/2024Listed for sale$13,000,000+30%$1,831/sqft
Source: IRES as distributed by MLS GRID #1019193 Report a problem
6/13/2022Sold$10,000,000+315.1%$1,409/sqft
Source: IRES as distributed by MLS GRID #976468 Report a problem
2/18/2020Sold$2,409,000-3.2%$339/sqft
Source: Public Record Report a problem
2/4/2020Pending sale$2,489,000$351/sqft
Source: Coldwell Banker Residential Brokerage - Boulder #899354 Report a problem
11/6/2019Price change$2,489,000-4.3%$351/sqft
Source: Coldwell Banker Residential Brokerage - Boulder #899354 Report a problem
9/20/2019Price change$2,600,000-6.1%$366/sqft
Source: Coldwell Banker Residential Brokerage - Boulder #899354 Report a problem
1/18/2019Price change$2,770,000-2.6%$390/sqft
Source: Estate Professionals #1862908 Report a problem
10/15/2018Price change$2,845,000-5%$401/sqft
Source: Estate Professionals #1862908 Report a problem
9/22/2018Price change$2,995,000+5.3%$422/sqft
Source: RE/MAX of Boulder #6221485 Report a problem
8/14/2018Price change$2,845,000-1.7%$401/sqft
Source: RE/MAX of Boulder, Inc #848244 Report a problem
6/21/2018Price change$2,895,000-3.3%$408/sqft
Source: RE/MAX of Boulder, Inc #848244 Report a problem
4/27/2018Listed for sale$2,995,000+103.3%$422/sqft
Source: RE/MAX of Boulder, Inc #848244 Report a problem
4/5/2007Sold$1,473,500+13%$208/sqft
Source: Public Record Report a problem
12/23/2002Sold$1,304,000+154.7%$184/sqft
Source: Public Record Report a problem
4/10/2000Sold$512,000$72/sqft
Source: Public Record Report a problem

Public tax history

YearProperty taxesTax assessment
2025$55,752 +1.8%$591,975 -7.2%
2024$54,784 +275.2%$638,062 -1%
2023$14,600 +4.9%$644,251 +309.8%
2022$13,922 +1.9%$157,223 -2.8%
2021$13,665 $161,747 +3%
2020$13,665 +6.3%$156,993
2019$12,859 $156,993 +5.9%
2018$12,859 $148,313 -9.5%
2017$12,859 +1.5%$163,968 +12.1%
2016$12,664 +5.6%$146,297 +24%
2015$11,992 +20.9%$117,999
2014$9,921 +7.4%$117,999
2013$9,236 +0.9%$117,999 +7%
2012$9,154 -8.9%$110,246
2011$10,049 +7.1%--
2010$9,383 -1.6%$124,330 -14.3%
2009$9,538 +3.5%$145,150 -2.6%
2008$9,212 +17.8%$149,070
2007$7,822 +3.9%$149,070 +21.8%
2006$7,531 +4.1%$122,400
2005$7,235 +0.7%$122,400 +3.4%
2004$7,184 +15%$118,410
2003$6,250 +94.2%$118,410
2002$3,218 --
2001-- $556,000

Find assessor info on the county website

Monthly payment

Est. payment
$65,745/mo
Principal & interest
$60445
Property taxes
$5300
More affordability toolsChevron Right

Estimated market value

Not available

Estimated sales range

Not available

Not available

Climate risks

Explore flood, wildfire, and other predictive climate risk information for this property on First Street®️.

Neighborhood: Carolyn Heights

Nearby schools

Columbine Elementary School
Grades PK-5 • 0.6 miles
4/10
GreatSchools® Rating
Test Score Rating
3/10
Student Progress Rating
4/10
Centennial Middle School
Grades 6-8 • 0.3 miles
7/10
GreatSchools® Rating
Test Score Rating
8/10
Student Progress Rating
6/10
Boulder High School
Grades 9-12 • 2 miles
10/10
GreatSchools® Rating
College Readiness Rating
9/10
Student Progress Rating
10/10

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