3633 21st St Boulder, CO 80304
North Boulder NeighborhoodEstimated payment $53,831/month
Highlights
- New Construction
- 0.81 Acre Lot
- Deck
- Centennial Middle School Rated A-
- Open Floorplan
- Wooded Lot
About This Home
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 BOULDER!
Listing Agent
The Agency - Boulder Brokerage Phone: 7203941997 License #100033651 Listed on: 02/06/2026
Home Details
Home Type
- Single Family
Est. Annual Taxes
- $29,641
Year Built
- Built in 2024 | New Construction
Lot Details
- 0.81 Acre Lot
- Security Fence
- Partially Fenced Property
- Level Lot
- Wooded Lot
Parking
- 3 Car Garage
- Driveway Level
Home Design
- Tri-Level Property
- Composition Roof
Interior Spaces
- Open Floorplan
- Vaulted Ceiling
- Ceiling Fan
- Skylights
- Gas Fireplace
- Dining Room
- Wood Flooring
- Fire Sprinkler System
Kitchen
- Eat-In Kitchen
- Microwave
- Dishwasher
- Kitchen Island
- Disposal
Bedrooms and Bathrooms
- 7 Bedrooms
- Walk-In Closet
Laundry
- Dryer
- Washer
Basement
- Basement Fills Entire Space Under The House
- Natural lighting in basement
Accessible Home Design
- Low Pile Carpeting
Outdoor Features
- Deck
- Patio
Schools
- Columbine Elementary School
- Centennial Middle School
- Boulder High School
Utilities
- Cooling System Mounted To A Wall/Window
- Zoned Heating
- Hot Water Heating System
- Radiant Heating System
Community Details
- No Home Owners Association
- 21St/Linden Sub Subdivision
Listing and Financial Details
- Assessor Parcel Number R0004105
Map
Home Values in the Area
Average Home Value in this Area
Tax History
| Year | Tax Paid | Tax Assessment Tax Assessment Total Assessment is a certain percentage of the fair market value that is determined by local assessors to be the total taxable value of land and additions on the property. | Land | Improvement |
|---|---|---|---|---|
| 2025 | $29,936 | $310,869 | $88,313 | $222,556 |
| 2024 | $29,936 | $310,869 | $88,313 | $222,556 |
| 2023 | $29,119 | $340,628 | $91,897 | $252,416 |
| 2022 | $22,935 | $246,976 | $71,488 | $175,488 |
| 2021 | $21,870 | $254,083 | $73,545 | $180,538 |
| 2020 | $22,405 | $257,401 | $83,727 | $173,674 |
| 2019 | $22,063 | $257,401 | $83,727 | $173,674 |
| 2018 | $18,273 | $210,766 | $84,312 | $126,454 |
| 2017 | $17,702 | $233,013 | $93,212 | $139,801 |
| 2016 | $16,537 | $191,040 | $70,287 | $120,753 |
| 2015 | $15,660 | $131,783 | $64,635 | $67,148 |
| 2014 | $11,080 | $131,783 | $64,635 | $67,148 |
Property History
| Date | Event | Price | List to Sale | Price per Sq Ft | Prior Sale |
|---|---|---|---|---|---|
| 02/06/2026 02/06/26 | For Sale | $10,000,000 | +122.2% | $1,431 / Sq Ft | |
| 04/21/2022 04/21/22 | Off Market | $4,500,000 | -- | -- | |
| 01/14/2022 01/14/22 | Sold | $4,500,000 | -9.1% | $644 / Sq Ft | View Prior Sale |
| 10/18/2021 10/18/21 | Price Changed | $4,950,000 | -3.9% | $708 / Sq Ft | |
| 09/30/2021 09/30/21 | For Sale | $5,150,000 | +102.0% | $737 / Sq Ft | |
| 06/24/2021 06/24/21 | Off Market | $2,550,000 | -- | -- | |
| 01/28/2019 01/28/19 | Off Market | $3,500,000 | -- | -- | |
| 09/07/2017 09/07/17 | Sold | $3,500,000 | -6.7% | $501 / Sq Ft | View Prior Sale |
| 08/08/2017 08/08/17 | Pending | -- | -- | -- | |
| 07/31/2017 07/31/17 | For Sale | $3,750,000 | +47.1% | $537 / Sq Ft | |
| 04/15/2014 04/15/14 | Sold | $2,550,000 | -7.3% | $365 / Sq Ft | View Prior Sale |
| 03/16/2014 03/16/14 | Pending | -- | -- | -- | |
| 01/27/2014 01/27/14 | For Sale | $2,750,000 | -- | $393 / Sq Ft |
Purchase History
| Date | Type | Sale Price | Title Company |
|---|---|---|---|
| Warranty Deed | $4,500,000 | New Title Company Name | |
| Warranty Deed | $3,500,000 | Land Title Guarantee Co | |
| Warranty Deed | $2,550,000 | First American | |
| Warranty Deed | $1,735,000 | Fidelity National Title Insu | |
| Interfamily Deed Transfer | -- | None Available | |
| Deed | $110,000 | -- | |
| Deed | -- | -- | |
| Warranty Deed | $270,000 | -- |
Mortgage History
| Date | Status | Loan Amount | Loan Type |
|---|---|---|---|
| Open | $2,000,000 | New Conventional | |
| Previous Owner | $245,000 | Adjustable Rate Mortgage/ARM | |
| Previous Owner | $1,301,250 | Adjustable Rate Mortgage/ARM |
Source: IRES MLS
MLS Number: IRE1051043
APN: 1463191-31-002
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Based on information submitted to the MLS GRID. All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information. Some IDX listings have been excluded from this website. Listing information is provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.
Information deemed reliable but not guaranteed by the MLS.
Based on information submitted to the MLS GRID
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