Metro Denver Luxury Homes For Sale

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.

Features
: Radiant, Forced Air, Hot Water
: Evaporative Cooling, Ceiling Fan(s)
: Full, Daylight
: Partial, Fenced
: Mountain(s)
: Gas, Gas Log, Family Room, Living Room
: Smoke Detector(s)
: Deck, Patio
: 2
: Dishwasher, Disposal, Microwave, Refrigerator, Self Cleaning Oven, Oven, Down Draft
: Contemporary
: Oversized
: Composition
: Public Sewer
: Bath
Address Map
CO
Boulder
Boulder
80304
4th
3421
Street
W106° 42' 26.8''
N40° 2' 14.6''
Additional Information
: Frame, Wood Siding
East
From Broadway, turn left on Juniper Ave. Turn right on 4th St. Property on left side.
Foothill
2
Boulder
: Open Floorplan, Eat-in Kitchen, Vaulted Ceiling(s), Five Piece Bath, Walk-In Closet(s)
Yes
Yes
1031 Exchange, Cash, Conventional
: Sprinklers In Front, Open Space, Rolling Slope, Ditch
Centennial
Colorado Realty 4 Less, LLC
R0108936
: House
Fourth Street 3403 Sub
$26,030
2025
: Cable Available, Electricity Available, Natural Gas Available, Internet Access (Wired)
SFR
03/13/2026
5198
Active
1
Boulder Valley RE 2
Boulder Valley RE 2
03/14/2026
Residential
03/13/2026
Public
: Three Or More

Fourth Street 3403 Sub

3421 4th Street, Boulder, CO 80304

6 Bedrooms
5 Total Baths
5,022 Square Feet
$6,800,000
Listing ID #IR1053821
Basic Details
Property Type : Residential
Listing Type : For Sale
Listing ID : IR1053821
Price : $6,800,000
Bedrooms : 6
Rooms : 18
Total Baths : 5
Full Bathrooms : 2
3/4 Bathrooms : 2
1/2 Bathrooms : 1
Square Footage : 5,022 Square Feet
Year Built : 1990
Lot Acres : 0.6
Property Sub Type : Single Family Residence
Status : Active
Originating System Name : REcolorado
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