Residential · Active

3621 21st Street

Boulder, CO 80304

4 Beds · 5 Baths · 6,300 Sq Ft

$12,000,000

Single Family

Property Type

0.66 acres

Lot Size

2021

Year Built

$1,905

Price per Sq Ft

3

Parking Spaces

IR1051395

MLS #

About This Property

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 detail, harmoniously blending wood, glass, stone, and steel to create an ambiance that is both inviting and inspiring. Upon entry, you'll be greeted by soaring ceilings, wide plank white oak flooring, & an open-concept main level bathed in abundant natural light streaming through expansive windows, inviting the outside in. The prodigious living area seamlessly integrates indoor & outdoor spaces, offering a glimpse of the splendid living experience that awaits. The architectural grandeur is showcased w/ a dramatic three-story open-tread wooden staircase, custom steel railings, & illuminated by bespoke lighting.

The centerpiece of the home, the gourmet kitchen, boasts an impressive center island, marble & quartz countertops, artisanal tile, custom cabinetry, top-tier chef's appliances, & walk-in pantry. The elegant main floor primary bedroom suite is a tranquil retreat, w/ wall-to-wall windows, a generous walk-in closet w/custom cabinetry. The soothing primary bathroom features premium quality finishes, including designer tile, custom cabinetry, & alluring lighting.The heated pool w/ a tanning shelf, natural stone deck, & automatic pool cover takes center stage in the serene yard. Every aspect of this smart home seamlessly integrates technology, design, & automation to ensure security & convenience, and efficiency.

For the discerning owner desiring a residence that embodies casual elegance & architectural interest, w/proximity to vibrant downtown Boulder & nestled in an upscale neighborhood, this property is a rare find that offers an unsurpassed lifestyle.

251 days on market

Listed by Patricia Dessel · Compass - Boulder · 3034756097

Last updated: 9/17/2026 10:11 AM · Source: REcolorado®, MLS#: IR1051395

Virtual Tour

Property Details

Key Details

Property Type Residential
Sub Type Single Family Residence
Status Active
Price per Sq Ft $1,905
Subdivision Carolyn Heights
MLS # IR1051395
Days on Market 251
Bedrooms 4
Full Baths 1
Half Baths 1
Three-Quarter Baths 3

More Details

Year Built 2021
Lot Size (Sq Ft) 28,700
Acres 0.66
HOA No
Annual Taxes $55,752
State CO
County Boulder
Zoning RES

Interior

Interior Features Eat-in Kitchen, Kitchen Island, Open Floorplan, Pantry, Vaulted Ceiling(s), Walk-In Closet(s), Wet Bar, Five Piece Bath
Heating Radiant
Cooling Central Air
Flooring Tile, Wood
Fireplace Features Gas, Living Room
Appliances Bar Fridge, Dishwasher, Disposal, Double Oven, Dryer, Freezer, Microwave, Oven, Refrigerator, Trash Compactor, Washer

Exterior & Parking

Exterior Features Dog Run, Gas Grill, Spa/Hot Tub
Garage Yes
Garage Spaces 3
Parking Features Heated Garage, Oversized
Roof Composition

Building & Lot

Basement Full
Lot Features Level, Sprinklers In Front
Architectural Style Contemporary
Levels Two
Construction Block, Brick, Stone, Wood Siding
Sewer Public Sewer
Water Source Public

Location

Price History

DateEventPrice
2/11/2026 Listed for sale
Source: REcolorado® #IR1051395
$12,000,000 $1,905/sqft

Based on information submitted to the MLS GRID as of October 20, 2026 at 10:57 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 September 17, 2026 at 10:11 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.