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3421 4th Street, Boulder, CO 80304

Boulder
Local realty services provided by:CENTURY 21 Trenka Real Estate
3421 4th Street,Boulder, CO 80304
$6,800,000
  • 6 Beds
  • 5 Baths
  • 5,198 sq. ft.
  • Single family
  • Active
Upcoming open houses
  • Sat, May 02
    12:00 pm - 04:00 pm
  • Sun, May 03
    12:00 pm - 04:00 pm
Listed by: kathleen haas
Office: colorado realty 4 less, llc.
MLS#:IR1053821
Source:ML

Price summary

  • Price:$6,800,000
  • Price per sq. ft.:$1,308.2

About this home

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...

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Home facts

  • Year built:1990
  • Listing ID #:IR1053821

Rooms and interior

  • Bedrooms:6
  • Total bathrooms:5
  • Full bathrooms:2
  • Half bathrooms:1
  • Bathrooms Description:Five Piece Bath
  • Kitchen Description:Dishwasher, Disposal, Down Draft, Eat-in Kitchen, Microwave, Oven, Refrigerator, Self Cleaning Oven
  • Basement:Yes
  • Basement Description:Daylight, Full
  • Living area:5,198 sq. ft.

Heating and cooling

  • Cooling:Ceiling Fan(s), Evaporative Cooling
  • Heating:Forced Air, Hot Water, Radiant

Structure and exterior

  • Roof:Composition
  • Year built:1990
  • Building area:5,198 sq. ft.
  • Lot area:0.6 Acres
  • Lot Features:Ditch, Open Space, Rolling Slope, Sprinklers In Front
  • Architectural Style:Contemporary
  • Construction Materials:Frame, Wood Siding
  • Exterior Features:Deck, Patio
  • Levels:3 or More Stories

Schools

  • High school:Boulder
  • Middle school:Centennial
  • Elementary school:Foothill

Utilities

  • Water:Public
  • Sewer:Public Sewer

Finances and disclosures

  • Price:$6,800,000
  • Price per sq. ft.:$1,308.2
  • Tax amount:$26,030 (2025)

Features and amenities

  • Amenities:Smoke Detector(s)

Parking

  • Total parking spaces:2
  • Parking description:Oversized
  • Garage:Yes
  • Garage spaces:2
MLS LogoBased on information submitted to the MLS GRID as of April 29, 2026 12:45 PM. All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information.

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