3421 4th ST, Boulder, CO 80304
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3421 4th ST, Boulder, CO 80304
3421 4th ST, Boulder, CO 80304
3421 4th ST, Boulder, CO 80304
3421 4th ST, Boulder, CO 80304
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Judy Johnson

Judy Johnson

+1(720) 303-5790
$ 6,800,000
Est. payment /mo
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Open Sat 12PM-4PM

3421 4th ST Boulder, CO 80304

6 Beds

5 Baths

5,198 SqFt

Open House

Sat Apr 18, 12:00pm - 4:00pm

Sun Apr 19, 12:00pm - 4:00pm

Sat Apr 25, 12:00pm - 4:00pm

Sun Apr 26, 12:00pm - 4:00pm

Sat May 02, 12:00pm - 4:00pm

Sun May 03, 12:00pm - 4:00pm

Sat May 09, 12:00pm - 4:00pm

UPDATED:

Key Details

Property Type Single Family Home

Sub Type Single Family Residence

Listing Status Active

Purchase Type For Sale

Square Footage 5,198 sqft

Price per Sqft $1,308

Subdivision Fourth Street 3403 Sub

MLS Listing ID IR1053821

Style Contemporary

Bedrooms 6

Full Baths 2

Half Baths 1

Three Quarter Bath 2

HOA Y/N No

Abv Grd Liv Area 3,927

Year Built 1990

Annual Tax Amount $26,030

Tax Year 2025

Lot Size 0.599 Acres

Acres 0.6

Property Sub-Type Single Family Residence

Source recolorado

Property Description

Newlands Sanctuary on Mt. Sanitas Open Space Step onto the 600-square-foot deck and look up. Mt. Sanitas rises 1,300 feet from your backyard gate, private access to the Goat Trail. No driving. No parking. Just you, your coffee, and maybe a 4-legged friend who will make sure you don't skip it. This premier property is one of eight homes backing directly to open space. In 21 years, only one has changed hands. Hidden behind a 70-yard tree-lined driveway on a 0.6-acre lot (2.5x standard), this is widely regarded as one of Boulder's best addresses, served by top rated schools.The 5,200-square-foot residence features 20-foot ceilings with west-facing glass framing Mt. Sanitas, white oak floors, two fireplaces, and a library overlooking the property's seven heritage apple trees. Six bedrooms plus office (convertible seventh) include three distinct suites: the primary en-suite with a stunning view; a garden-level walkout in-law addition (2005, 12' ceilings) with separate entrance, private patio, and dedicated office-ideal for multigenerational living or guests-plus a basement suite with whirlpool bath. Outside you will discover a deep wrap-around porch beneath a 60-foot silver maple, flower and vegetable gardens, and the historic Silver Lake Ditch with 12,000 gallons daily water rights. Sundance Film Festival arrives January 2027, venues minutes away providing a chance at an incredible rental income opportunity and under the Augusta Rule, 14 days of rental income may be tax-free. Roof replaced 2019. New carpet. Heated two-car garage. No HOA. No covenants. For those who know Newlands: this is the privacy, the lot, the view, and the trail access that almost never comes to market. For those discovering Boulder for the first time: welcome to the neighborhood the locals covet most.

Location

State CO

County Boulder

Zoning SFR

Rooms

Basement Daylight, Full

Main Level Bedrooms 1

Interior

Interior Features Eat-in Kitchen, Five Piece Bath, Open Floorplan, Vaulted Ceiling(s), Walk-In Closet(s)

Heating Forced Air, Hot Water, Radiant

Cooling Ceiling Fan(s), Evaporative Cooling

Fireplaces Type Family Room, Gas, Gas Log, Living Room

Fireplace N

Appliance Dishwasher, Disposal, Down Draft, Microwave, Oven, Refrigerator, Self Cleaning Oven

Exterior

Parking Features Oversized

Garage Spaces 2.0

Fence Fenced, Partial

Utilities Available Cable Available, Electricity Available, Internet Access (Wired), Natural Gas Available

View Mountain(s)

Roof Type Composition

Total Parking Spaces 2

Garage Yes

Building

Lot Description Ditch, Open Space, Rolling Slope, Sprinklers In Front

Sewer Public Sewer

Water Public

Level or Stories Three Or More

Structure Type Frame,Wood Siding

Schools

Elementary Schools Foothill

Middle Schools Centennial

High Schools Boulder

School District Boulder Valley Re 2

Others

Acceptable Financing 1031 Exchange, Cash, Conventional

Listing Terms 1031 Exchange, Cash, Conventional

REColorado (REColorado MLS)
© 2026 METROLIST, INC., DBA RECOLORADO® – All Rights Reserved
6455 S. Yosemite St., Suite 500 Greenwood Village, CO 80111 USA
Listed by Colorado Realty 4 Less, LLC
Judy Johnson

Judy Johnson

Agent

+1(720) 303-5790

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3421 4th ST