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.
Sold for $8,000,000
$8,000,000
3555 4th St, Boulder, CO 80304
4beds
4,218sqft
Single Family Residence
Built in 2021
0.35 Acres Lot
$7,999,500 Zestimate®
$1,897/sqft
$7,417 Estimated rent
Home value
$7,999,500
$7.52M - $8.48M
$7,417/mo
Zestimate® history
Owner options
List your home for rent
$7,417/mo
Rent Zestimate®
Find your next renter with Zillow Rental Manager. Plus, with online applications, you can quickly screen prospective tenants – for free.
$7,417/mo
Rent Zestimate®
Refinance and save
$37,355/mo
Est. payment
Refinancing to a lower rate could help reduce your monthly payments and save thousands over the life of the loan.
$37,355/mo
Est. payment
Explore your selling options
Work with a Zillow partner agent
Leverage their expertise and Zillow's premium Showcase listings to get your home seen by more buyers.
Get startedList with your own agent
Get your home in front of millions of buyers by listing it on Zillow.
Learn how to do itSell it yourself
Take full control of how buyers see your home on Zillow by listing For Sale by Owner (FSBO).
List your homeWhat's special
Zillow last checked:
Listing updated:
Listed by:
Lucy Conklin 720-470-0910,
Compass - Boulder
Bought with:
Lynn Ryan, 1320795
milehimodern - 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: $1,897/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
Price history
| Date | Event | Price |
|---|---|---|
| 7/30/2026 | Sold | $8,000,000+0.6%$1,897/sqft |
Source:  IRES as distributed by MLS GRID #1058738 Report a problem | ||
| 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
Neighborhood: Juniper - Kalmia
Nearby homes
- $4,188,9005 bd4 ba5.3k sqft3551 4th St, Boulder, CO 80304Off Market
- $1,297,8002 bd1 ba1.1k sqft3433 4th St, Boulder, CO 80304Off Market
- $927,4001 bd1 ba420 sqft3433 4th St, Boulder, CO 80304Off Market
- $26,000-- bd-- ba-- sqft3477 4th St, Boulder, CO 80304Off Market
- $2,050,0004 bd3 ba3.8k sqft3561 4th St, Boulder, CO 80304Sold
- $4,525,6004 bd3 ba5.2k sqft3547 4th St, Boulder, CO 80304Off Market
- $5,087,1004 bd4 ba4k sqft3535 4th St, Boulder, CO 80304Off Market
- $1,853,3005 bd3 ba3k sqft3490 4th St, Boulder, CO 80304Off Market
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.
Get a cash offer in 3 minutes
Find out how much your home could sell for in as little as 3 minutes with a no-obligation cash offer.
Estimated market value
$7,999,500
Get a cash offer in 3 minutes
Find out how much your home could sell for in as little as 3 minutes with a no-obligation cash offer.
Estimated market value
$7,999,500
Nearby cities
Nearby neighborhoods
Nearby zip codes
Other Boulder Topics
