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.
Pending
$7,950,000
3555 4th St, Boulder, CO 80304
4beds
4,218sqft
Single Family Residence
Built in 2021
0.35 Acres Lot
$-- Zestimate®
$1,885/sqft
$-- HOA
What's special
- 51 days |
- 654 |
- 34 |
Zillow last checked:
Listing updated:
Listed by:
Lucy Conklin 720-470-0910,
Compass - Boulder
Source: IRES as distributed by MLS GRID,MLS#: 1058738
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 5
- Full bathrooms: 4
- 1/2 bathrooms: 1
- Main level bathrooms: 2
Rooms
- Room types: Loft
Primary bedroom
- Description: Hardwood
- Features: Luxury Features Primary Bath, 5 Piece Primary Bath
- Level: Upper
- Area: 221 Square Feet
- Dimensions: 13 x 17
Bedroom 2
- Description: Hardwood
- Level: Main
- Area: 221 Square Feet
- Dimensions: 17 x 13
Bedroom 3
- Description: Hardwood
- Level: Upper
- Area: 144 Square Feet
- Dimensions: 12 x 12
Bedroom 4
- Level: Upper
- Area: 144 Square Feet
- Dimensions: 12 x 12
Dining room
- Description: Hardwood
- Level: Main
- Area: 180 Square Feet
- Dimensions: 12 x 15
Family room
- Description: Hardwood
- Level: Upper
- Area: 336 Square Feet
- Dimensions: 16 x 21
Great room
- Description: Hardwood
- Level: Main
- Area: 468 Square Feet
- Dimensions: 18 x 26
Kitchen
- Description: Hardwood
- Level: Main
- Area: 294 Square Feet
- Dimensions: 14 x 21
Laundry
- Description: Tile
- Level: Main
- Area: 84 Square Feet
- Dimensions: 7 x 12
Heating
- Forced Air, Zoned, Radiant, Humidity Control
Cooling
- Central Air
Appliances
- Included: Disposal
- Laundry: Washer/Dryer Hookup
Features
- Eat-in Kitchen, Separate Dining Room, Open Floorplan, Pantry, Walk-In Closet(s), Wet Bar, Kitchen Island, High Ceilings
- Flooring: Wood
- Windows: Window Coverings
- Basement: None
- Has fireplace: Yes
- Fireplace features: Multi-Sided, Great Room
Interior area
- Total structure area: 4,218
- Total interior livable area: 4,218 sqft
- Finished area above ground: 4,218
Property
Parking
- Total spaces: 3
- Parking features: Attached, Heated Garage, Oversized
- Attached garage spaces: 3
- Details: Attached
Accessibility
- Accessibility features: Level Lot, Accessible Hallway(s), Accessible Doors, Main Floor Bath, Accessible Bedroom, Stall Shower, Main Level Laundry
Features
- Levels: Two
- Stories: 2
- Patio & porch: Patio, Deck
- Exterior features: Sprinkler System, Balcony
- Fencing: Fenced,Wood,Other
- Has view: Yes
- View description: Hills
Lot
- Size: 0.35 Acres
- Features: Wooded, Evergreen Trees, Deciduous Trees, Level, Rock Outcropping, City Limits, Paved
Details
- Parcel number: R0033198
- Zoning: SFR
- Special conditions: Private Owner
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Contemporary
- Property subtype: Single Family Residence
Materials
- Stone, Composition
- Roof: Rubber
Condition
- New construction: No
- Year built: 2021
Utilities & green energy
- Electric: Xcel Energy, Photovoltaics Seller Owned
- Gas: Xcel Energy
- Sewer: Public Sewer
- Water: City
- Utilities for property: Natural Gas Available, Electricity Available, Cable Available, Satellite Avail, High Speed Avail
Green energy
- Energy efficient items: Windows, High Efficiency Furnace, Energy Rated
Community & HOA
Community
- Security: Fire Sprinkler System, Fire Alarm
- Subdivision: Silver Lake Sub
HOA
- Has HOA: No
Location
- Region: Boulder
Financial & listing details
- Price per square foot: $1,885/sqft
- Tax assessed value: $3,266,275
- Annual tax amount: $16,016
- Date on market: 5/11/2026
- Listing terms: Cash,Conventional
- Exclusions: Staging items
- Electric utility on property: Yes
- Road surface type: Asphalt
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 6/12/2026 | Pending sale | $7,950,000$1,885/sqft |
Source:  IRES as distributed by MLS GRID #1058738 Report a problem | ||
| 5/15/2026 | Listed for sale | $7,950,000+364.9%$1,885/sqft |
Source: IRES as distributed by MLS GRID #1058738 Report a problem | ||
| 6/23/2017 | Sold | $1,710,000-6.3%$405/sqft |
Source: IRES as distributed by MLS GRID #812175 Report a problem | ||
| 2/24/2017 | Listed for sale | $1,825,000+32.7%$433/sqft |
Source: Colorado Landmark-Boulder #812175 Report a problem | ||
| 10/30/2006 | Sold | $1,375,000$326/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $16,016 +5.4% | $204,142 +9.8% |
| 2024 | $15,189 +576.3% | $185,922 +12.3% |
| 2023 | $2,246 -82% | $165,586 +584.7% |
| 2022 | $12,462 -72.6% | $24,185 -83.3% |
| 2021 | $45,564 | $144,778 -72.3% |
| 2020 | $45,564 +66% | $523,450 |
| 2019 | $27,456 | $523,450 +65.3% |
| 2018 | $27,456 | $316,680 +157% |
| 2017 | $27,456 +277.2% | $123,237 +46.6% |
| 2016 | $7,279 +5.6% | $84,089 -5% |
| 2015 | $6,893 -7.4% | $88,507 |
| 2014 | $7,442 -12.8% | $88,507 |
| 2013 | $8,535 +0.9% | $88,507 -13.1% |
| 2012 | $8,460 +17.8% | $101,888 |
| 2011 | $7,180 +7.1% | -- |
| 2010 | $6,704 -1.2% | $88,830 |
| 2009 | $6,783 +3.5% | $88,830 -16.2% |
| 2008 | $6,552 +35.7% | $106,020 |
| 2007 | $4,828 +3.9% | $106,020 +40.3% |
| 2006 | $4,648 +14.4% | $75,550 -12.1% |
| 2005 | $4,062 +0.7% | $85,920 +29.3% |
| 2004 | $4,033 +1.9% | $66,470 |
| 2003 | $3,959 +10.3% | $66,470 +17.1% |
| 2002 | $3,589 | $56,740 -90.8% |
| 2001 | -- | $620,100 |
Find assessor info on the county website
Monthly payment
Est. payment$--/mo
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
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Climate risks
Neighborhood: Juniper - Kalmia
Nearby schools
GreatSchools rating
- 8/10Foothill Elementary SchoolGrades: K-5Distance: 0.4 mi
- 7/10Centennial Middle SchoolGrades: 6-8Distance: 1.3 mi
- 10/10Boulder High SchoolGrades: 9-12Distance: 2 mi
Schools provided by the listing agent
- Elementary: Foothill
- Middle: Centennial
- High: Boulder
Source: IRES as distributed by MLS GRID. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
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