USACOBoulderFourth Street 3403 Sub3421 4Th St

3421 4 Th St, Boulder, CO

Name: 3421 4 Th St, For Sale in Boulder - eXp Realty
Brand: Colorado Realty 4 Less, LLC
SKU: 1053821
Price: 6800000 USD

House

For Sale

Listed price in listed location currency (USD).

$6,800,000

450

MLS® 1053821

Key Facts
Description
Rooms
Map

Key Facts

Type Single Family Residence

Levels Residential

Size 5022 sqft

Garage Yes

Taxes $26,030

Days Active 1

Lot Size 0.6 acres

Approx. Age 1990

Avg. Price Per Sqft $1,354

MLS® Number 1053821

Property Address: 3421 4th St, Boulder, CO, 80304-1701

Average square foot calculated using Size range provided by listing agent.

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 furry 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 come to market. For those discovering Boulder for the first time? Welcome to the neighborhood the locals covet most.

MLS® Number1053821

Laundry Level

Central VacNo

FireplaceNo

Acreage0.6

Exterior

GarageYes

Approx. Age1990

BasementFull, Partially Finished, Daylight

DrivewayGarage Door Opener, Attached

Garage Spaces2

Heat

A/C

Heating Fuel

Extras

Price History

-End Date

Not Sold YetSold Price

For Sale

Mar 13, 2026List Date

$6,800,000List Price

Home Appraisal

This property is estimated to sell between: $3,110,000 and $8,645,000.

Similar properties in this area sold on average for: $3,110,000

Expected to sell in 142 days. Similar properties sold in 143 days. This home has been on eXp Realty for 1 day.

The estimated sale price does not take into account many variables such as recent renovations, type of appliances, school district etc. To get a more accurate estimate please contact agent.

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Starting Address

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