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Off Market

3555 4th St

Boulder CO 80304

4
5
3
4218 sq. ft.
15445 sq. ft.
Single-Family
Last sold for $8,000,000
Lucy ConklinLucy Conklin, last sold this property on 30 July 2026 after 76 days on market.

Overview

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.

Features

4 bedrooms
5 bathrooms
3 carspaces
3 garage spaces
4218 sq. ft. floor area
15445 sq. ft. lot size
Single-Family

Estimated Value

Based on this property and similar 4 bedroom single-family properties sold in Boulder over the last 12 months, the estimated median property value of 3555 4th St is $1.82m.

Median value
$1.82m
Estimated value range
$675k - $8m
Median days on market
52
Estimated value trend
0%
increase over the last 12 months
Average days on market is based on recent, comparable sales in Boulder. It is only an indication of the time a property is actively listed and should not be relied upon as an accurate representation of how soon a property will be sold.

Property history for 3555 4th St

2026
Sold
$8,000,000
30 Jul 2026 by Lucy Conklin, of Compass - Boulder
2017
Sold
$1,710,000
23 Jun 2017 by Stephen Remmert, of Colorado Landmark-Boulder

Happy sellers in Boulder

~%

We have insufficient information to provide an overview of customer satisfaction for Boulder. Viewing the agent profiles, reviews and sales for Boulder can provide insights for this location.

Local market activity for 4 bedroom single-family properties in Boulder

In the last 12 months, 91 four-bedroom single-family properties similar to 3555 4th St, have been sold.

This represents a 3% decrease in four-bedroom single-family properties sales when compared to the previous 12 months.

Nearby agents

Compare and contact these top performing agents who’ve delivered exception customer service for their clients in Boulder

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David Scott

David Scott is a recommended agent for Boulder.  They have 2 local sales and collected 2 local reviews across the last 12 months.

  •   5   (4 reviews)
  •  2 Reviews in Boulder
  •  2 Sales in Boulder
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Ryan Davis

Sellers who recommend Ryan Davis have praised them for being local expert, clear communication, reliable, responsive, detail-oriented, supportive, and well-prepared

  •   5   (69 reviews)
  •  1 Review in Boulder
  •  1 Sale in Boulder
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John Mcelveen

John Mcelveen is a recommended agent for Boulder.  They have 5 local sales across the last 12 months.

  •  5 Sales in Boulder
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Anne Wells

Anne Wells is a recommended agent for Boulder.  They have 5 local sales across the last 12 months.

  •   4.8   (6 reviews)
  •  5 Sales in Boulder
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