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3421 4th St

Boulder, CO 80304
  • $6,800,000
  • STATUS: Active
  • ON SITE: 183 Days
  • MLS #: 1053821
UPDATED: 119 min ago
$6,800,000
  • 6
    BEDS
  • 0.6
    ACRES
  • 4
    BATHS
  • 1
    1/2 BATHS
  • 5,022
    SQFT
  • $1,354
    $/SQFT
Neighborhood:
Type:
Single-Family Home
Built:
1990
County:
Area:

School Information

Elementary School:
Middle School:
High School:
School District:

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.

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© 2026 Information and Real Estate Services, LLC. IDX information is provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information is deemed reliable but is not guaranteed accurate by the MLS or Downtown Real Estate Brokers, LLC.. Data last updated: 2026-09-12T23:43:48.59.

Information source: Information and Real Estate Services, LLC. Provided for limited non-commercial use only under IRES Rules © Copyright IRES.
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3421 4th St Boulder, CO 80304

  • Price: $6,800,000
  • Status: Active
  • On Site: 183 Days
  • Updated: 119 min ago
  • MLS #: 1053821
6
Beds
4
Baths
1
½ Baths
0.6
Acres
5,022
SQFT
$1,354
$/SQFT
1990
Built
Neighborhood:
Fourth Street 3403 Sub
County:
Boulder
Area:
Boulder
Elementary School:
Foothill
Middle School:
Centennial
High School:
Boulder
School District:
Boulder Valley Dist Re2
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.
Exterior Features

Architectural Style Legal ConformingContemporary Construction Materials FrameWood Siding Exterior Features Sprinkler SystemOversized Garage Garage Sq Ft 528 Garage Type Attached Parking Features Garage Door OpenerAttached Patio And Porch Features PatioDeck Roof Composition Spa Features Bath View Hills Waterfront YN No

Interior Features

Above Grade Finished Area 3927 All Bedrooms Conform Yes Appliances Gas RangeDown DraftSelf Cleaning OvenDishwasherRefrigeratorMicrowaveDisposalFire Alarm Basement FullPartially FinishedDaylight Bathrooms Total Integer 5 Baths Full Additional 0 Baths Full Basement 1 Baths Full Lower 0 Baths Full Main 0 Baths Full Upper 1 Baths Half Additional 0 Baths Half Basement 0 Baths Half Lower 0 Baths Half Main 1 Baths Half Upper 0 Baths Rough In 0 Baths Three Quarters Additional 0 Baths Three Quarters Basement 0 Baths Three Quarters Lower 0 Baths Three Quarters Main 1 Baths Three Quarters Upper 1 Cooling Evaporative CoolingCeiling Fan(s) Fireplace Features Two or MoreGasGas LogLiving RoomFamily Room Has Family Room No Has Study Yes Heating Forced AirHot WaterZonedRadiant2 or more Heat Sources Interior Features Eat-in KitchenSeparate Dining RoomCathedral Ceiling(s)Open FloorplanWalk-In Closet(s) Levels Four Living Area Source Other Main Floor Sq Ft 2385

Property Features

Are Ditches Active No Association YN No Electric Xcel Exclusions Furnishings and Personal Property Fencing PartialFencedWoodChain Link Flood Plain Minimal Flood or C Rating Gas Xcel Has Improvements No Has Irrigation Ditches No Has Metro Tax District No Has Water Rights No Irrigation Water Rights YN No Is Water Meter Installed Yes Listing Terms CashConventionalOwner Pays Points1031 Exchange Lot Features WoodedEvergreen TreesDeciduous TreesSloping LotAbuts DitchAbuts Public Open SpaceHouse Faces EastPavedWater Rights Included New Construction Status Not NewPreviously Owned New Construction YN No Possible Use Single Family Property Sub Type Single Family Residence Road Frontage Type City Street Road Surface Type Asphalt Sewer Public Sewer Special Listing Conditions Other Owner Tax Annual Amount 26030 Tax Year 2025 Utilities Natural Gas AvailableElectricity AvailableCable AvailableHigh Speed Avail Water Source City Zoning SFR

Listing information © 2026 Information and Real Estate Services
Listing provided courtesy of Kathleen Haas of Colorado Realty 4 Less, LLC: 9705317448.



IRES logo

© 2026 Information and Real Estate Services, LLC. IDX information is provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information is deemed reliable but is not guaranteed accurate by the MLS or Downtown Real Estate Brokers, LLC.. Data last updated: 2026-09-12T23:43:48.59.

Information source: Information and Real Estate Services, LLC. Provided for limited non-commercial use only under IRES Rules © Copyright IRES.
 
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