3555 4th St, Boulder, CO 80304
Property image
Property image
SOLD
JUL 30, 2026

3555 4th St
Boulder, CO 80304

Juniper - Kalmia
  • 4 Beds
  • 4.5 Baths
  • 4,218 sqft (on 0.35 acres)

$8,000,000

Last Sold: Jul 30, 2026
1% over list $7.95M
$1,897/sqft
Est. Refi. Payment $44,694/mo*
Refinance Your Home

$8,000,000

Last Sold: Jul 30, 2026
1% over list $7.95M
$1,897/sqft
Est. Refi. Payment $44,694/mo*
Refinance Your Home
4 Beds
4.5 Baths
4,218 sqft
(on 0.35 acres)

Local Information

  • Map ViewExplore the area around 3555 4th St.
  • Schools1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Property Type
Single-Family Home
Year Built
2021
Lot Size
0.35 acres
Living Area
4,218 sqft
Price/Sqft
$1,897/sqft
Parking
3 Car Garage

About this House

Set into the foothills at the base of Mount Sanitas, 3555 4th Street is a study in organic modernism, where limestone, steel, & expanses of glass blur the line between home & landscape. Designed by Fanas Architecture, the home is a work of architectural integrity, realized at the highest level of craft. A smooth limestone spine wall threads through the home, with rough-hewn limestone as a counterpoint. In the great room, exposed steel I-beams frame 24-foot retractable walls of glass, opening to north & south-facing patios. European white oak with radiant heat runs underfoot, beneath a floating wood-plank ceiling washed in cove lighting. The chef's kitchen by EKD features custom walnut cabinetry, a hand-laid mosaic backsplash, Dornbracht fixtures, & Gaggenau appliances. Built-ins flow through the butler's pantry, mudroom, & laundry. A main-floor flex suite serves as primary, office, or guest, complete with walk-out patio, walnut walk-in closet, & Japanese-inspired bath in Vola fixtures. The primary suite opens to the second-story deck through wall-to-wall sliding glass. Behold a coved wood plank ceiling, pin lights, and sculptural pendants. The primary bath is a masterful blend, anchored by a freestanding MTI resin tub, with a steam shower, bespoke cabinetry, alabaster sconces, & a custom walk-in closet. A loft with a wet bar adjoins two ensuite bedrooms. Over 3,200 square feet of finished exterior living space spans three levels, redefining outdoor living in Boulder. The south terrace pairs an overhang & electronic louvres with a fire pit & water features. Steel stairs rise to the upper deck, unveiling a hot tub, cantilevered overhang, and Sanitas to the west. Above, a rooftop deck opens to panoramic views. Lutron lighting on Control4, radiant heat across nine zones, full solar array, & two EV-charging rough-ins. Steps from the Goat trail and tucked into one of Boulder's most iconic neighborhoods, 3555 4th Street is a triumph of detail, intention, & place.
3555 4th St, Boulder, CO 80304 is a 4 bedroom, 5 bathroom, 4,218 sqft single-family home in Juniper - Kalmia, built in 2021. It last sold for $8,000,000 on Jul 30, 2026 (1% above the $7,950,000 asking price). It is currently off market. The Trulia Estimate is $7,433,200, with a rent estimate of $7,417/month.

Home Details for 3555 4th St

Interior Features

Interior Details
Basement: NoneNumber of Rooms: 9Types of Rooms: Primary Bedroom, Bedroom 2, Bedroom 3, Bedroom 4, Dining Room, Family Room, Great Room, Kitchen, LaundryWet Bar
Beds & Baths
Number of Bedrooms: 4Number of Bathrooms: 5Number of Bathrooms (full): 4Number of Bathrooms (half): 1Number of Bathrooms (main level): 2
Dimensions and Layout
Living Area: 4218 Square Feet
Appliances & Utilities
Utilities: Natural Gas Available, Electricity Available, Cable Available, Satellite Avail, High Speed AvailAppliances: DisposalDisposalLaundry: Washer/Dryer Hookup
Heating & Cooling
Heating: Forced Air,Zoned,Radiant,Humidity ControlHas CoolingAir Conditioning: Central AirHas HeatingHeating Fuel: Forced Air
Fireplace & Spa
Fireplace: Multi-Sided, Great RoomHas a Fireplace
Gas & Electric
Electric: Xcel Energy, Photovoltaics Seller OwnedGas: Xcel EnergyHas Electric on Property
Windows, Doors, Floors & Walls
Window: Window CoveringsFlooring: Wood
Levels, Entrance, & Accessibility
Stories: 2Levels: TwoAccessibility: Level Lot, Accessible Hallway(s), Accessible Doors, Main Floor Bath, Accessible Bedroom, Stall Shower, Main Level LaundryFloors: Wood
View
Has a ViewView: Hills
Security
Security: Fire Sprinkler System, Fire Alarm

Exterior Features

Exterior Home Features
Roof: RubberPatio / Porch: Patio, DeckFencing: Fenced, Wood, OtherExterior: Sprinkler System, BalconySprinkler System
Parking & Garage
Number of Garage Spaces: 3Number of Covered Spaces: 3Other Parking: AttachedNo CarportHas a GarageHas an Attached GarageParking Spaces: 3Parking: Attached,Heated Garage,Oversized
Frontage
Road Frontage: City StreetRoad Surface Type: AsphaltNot on Waterfront
Water & Sewer
Sewer: Public Sewer
Farm & Range
Does Not Include Irrigation Water Rights
Finished Area
Finished Area (above surface): 4218 Square Feet

Property Information

Year Built
Year Built: 2021
Property Type / Style
Property Type: ResidentialProperty Subtype: Single Family ResidenceArchitecture: Contemporary
Building
Construction Materials: Stone, CompositionNot a New ConstructionNot Attached Property
Property Information
Usage of Home: Single FamilyNot Included in Sale: Staging itemsParcel Number: R0033198

Price & Status

Price
List Price: $7,950,000Price Per Sqft: $1,897/sqft

Active Status

MLS Status: Sold

Location

Direction & Address
City: BoulderCommunity: Silver Lake Sub
School Information
Elementary School: FoothillJr High / Middle School: CentennialHigh School: BoulderHigh School District: Boulder Valley Dist RE2

Building

Building Area
Building Area: 4218 Square Feet

HOA

No HOA

Lot Information

Lot Area: 0.35 acres

Listing Info

Special Conditions: Private Owner

Offer

Listing Terms: Cash, Conventional

Energy

Energy Efficiency Features: Windows, High Efficiency Furnace, Energy Rated

Miscellaneous

Mls Number: 1058738Attribution Contact: 720-470-0910Above Grade Unfinished Area: 4218Activation Date: Fri May 15 2026
Last check for updates: about 3 hours ago
Listed by Lucy Conklin, (720) 470-0910
Compass - Boulder
Bought with: Lynn Ryan, (303) 489-0309, milehimodern - Boulder
Source: IRES as distributed by MLS GRID, MLS#1058738

Price History for 3555 4th St

DatePriceEventSource
07/30/2026$8,000,000Sold
IRES as distributed by MLS GRID #1058738
06/12/2026$7,950,000PendingIRES as distributed by MLS GRID #1058738
05/15/2026$7,950,000Listed For SaleIRES as distributed by MLS GRID #1058738
06/23/2017$1,710,000Sold
IRES as distributed by MLS GRID #812175
02/24/2017$1,825,000Listed For SaleAgent Provided
10/30/2006$1,375,000Sold
N/A

Market trends in Boulder

Last updated June 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$891K
$60.83KMoM
Sale-to-List Price
98.2%
0.4%MoM
Price per sq ft
$503
$2MoM
Available listings
778
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Property Tax and Assessment

Year2025
Tax$16,016
Assessment$3,266,275
Home facts updated by county records

Comparable Sales for 3555 4th St

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
440 Japonica Way, Boulder, CO
0.11
Single-Family Home
$8,500,000
07/02/26
5
4.5
5,244
3561 4th St, Boulder, CO
0.03
Single-Family Home
$2,050,000
03/06/26
4
3
3,879
640 Iris Ave, Boulder, CO
0.24
Single-Family Home
$5,250,000
06/30/26
4
4.5
5,226
550 Iris Ave, Boulder, CO
0.20
Single-Family Home
$4,000,000
01/16/26
4
4
4,473
503 Kalmia Ave, Boulder, CO
0.17
Single-Family Home
$3,438,500
05/26/26
4
3.5
5,381
865 Kalmia Ave, Boulder, CO
0.34
Single-Family Home
$2,950,000
04/29/26
5
3.5
4,220
503 Hawthorn Ave, Boulder, CO
0.21
Single-Family Home
$5,150,000
06/12/26
6
5.5
5,670
3815 Lakebriar Dr, Boulder, CO
0.41
Single-Family Home
$2,505,000
06/02/26
4
3.5
4,045
864 Iris Ave, Boulder, CO
0.36
Single-Family Home
$3,205,000
03/10/26
4
4
3,208

Nearby homes

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Assigned Schools

These are the assigned schools for 3555 4th St.
View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

Neighborhood Overview

Juniper - Kalmia
See Local Highlights
Neighborhood stats provided by third party data sources.

What Locals Say about Juniper - Kalmia

At least 2 Trulia users voted on each feature.

  • 100 % Say parking is easy

  • 100 % Say there are community events

  • 100 % Say it's dog friendly

  • 100 % Say there's holiday spirit

  • 100 % Say people would walk alone at night

  • 100 % Say it's quiet

  • 100 % Say there's wildlife

  • 80 % Say it's walkable to grocery stores

  • 77 % Say neighbors are friendly

  • 75 % Say kids play outside

  • 71 % Say yards are well-kept

  • 67 % Say it's walkable to restaurants

  • 40 % Say there are sidewalks

  • 33 % Say streets are well-lit

Sourced by Trulia users. Learn more about our methodology.
  • Megan La Grave
    "Fantastic neighborhood for all ages and pets! Come walk it sometime and see for yourself. Close to the trails "
    0
    Flag
  • Trulia User
    "A close knit neighborhood and desirable area of Boulder at the foot of the mountains. You are as likely to get a wave as you are to see wildlife walking down the middle of the street."
    1
    Flag

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Homes for sale near 3555 4th St

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Off Market Homes Near 3555 4th St

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Based on information submitted to the MLS GRID as of 2026-07-30 15:13:19 PDT. 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. Click here for more information