Residential · Active

3633 21st Street

Boulder, CO 80304

7 Beds · 5 Baths · 6,988 Sq Ft

$8,950,000

Single Family

Property Type

0.81 acres

Lot Size

2024

Year Built

$1,281

Price per Sq Ft

3

Parking Spaces

IR1070740

MLS #

About This Property

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.

4 days on market

Listed by Marybeth Emerson · The Agency - Boulder · 7203941997

Last updated: 10/16/2026 10:25 AM · Source: REcolorado®, MLS#: IR1070740

Virtual Tour

Property Details

Key Details

Property Type Residential
Sub Type Single Family Residence
Status Active
Price per Sq Ft $1,281
Subdivision 21st/Linden Sub
MLS # IR1070740
Days on Market 4
Bedrooms 7
Full Baths 3
Half Baths 1
Three-Quarter Baths 1

More Details

Year Built 2024
Lot Size (Sq Ft) 35,311
Acres 0.81
HOA No
Annual Taxes $29,641
State CO
County Boulder
Zoning RR-1

Interior

Interior Features Eat-in Kitchen, Kitchen Island, Open Floorplan, Pantry, Vaulted Ceiling(s), Walk-In Closet(s), Five Piece Bath
Heating Hot Water, Radiant
Cooling Ceiling Fan(s), Central Air
Flooring Tile, Wood
Fireplace Features Gas
Appliances Dishwasher, Disposal, Dryer, Microwave, Oven, Refrigerator, Washer

Exterior & Parking

Garage Yes
Garage Spaces 3
Parking Features Oversized
Roof Composition

Building & Lot

Basement Daylight, Full
Lot Features Level, Sprinklers In Front
Architectural Style Contemporary
Levels Tri-Level
Construction Wood Siding
Sewer Public Sewer
Water Source Public

Location

Price History

DateEventPrice
10/16/2026 Listed for sale
Source: REcolorado® #IR1070740
$8,950,000 $1,281/sqft

Based on information submitted to the MLS GRID as of October 20, 2026 at 11:42 AM MDT. 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.

Listing information last updated October 16, 2026 at 10:25 AM.

Connect with an Agent

Preferred contact method (optional)

By selecting Text you agree to receive text messages from Mont Haus International Realty. Message & data rates may apply; frequency varies; reply STOP to opt out.