About 3421 4th St
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.
Open House
Features of 3421 4th St
| MLS® # | 1053821 |
|---|---|
| Price | $6,800,000 |
| Bedrooms | 6 |
| Bathrooms | 5.00 |
| Full Baths | 2 |
| Half Baths | 1 |
| 3/4 Baths | 2 |
| Square Footage | 5,198 |
| Acres | 0.60 |
| Year Built | 1990 |
| Type | Residential |
| Sub-Type | Single Family Residence |
| Style | Legal Conforming, Contemporary |
| Status | Active |
Community Information
| Address | 3421 4th St |
|---|---|
| Area | Boulder |
| Subdivision | Fourth Street 3403 Sub |
| City | Boulder |
| County | Boulder |
| State | CO |
| Zip Code | 80304 |
Amenities
| Utilities | Natural Gas Available, Electricity Available, Cable Available, High Speed Avail |
|---|---|
| Parking | Garage Door Opener, Attached |
| # of Garages | 2 |
| Garages | Attached |
| View | Hills |
| Is Waterfront | No |
| Has Pool | No |
Interior
| Interior Features | Eat-in Kitchen, Separate Dining Room, Cathedral Ceiling(s), Open Floorplan, Walk-In Closet(s) |
|---|---|
| Appliances | Gas Range, Down Draft, Self Cleaning Oven, Dishwasher, Refrigerator, Microwave, Disposal, Fire Alarm |
| Heating | Forced Air, Hot Water, Zoned, Radiant, 2 or more Heat Sources |
| Cooling | Evaporative Cooling, Ceiling Fan(s) |
| Fireplace | No |
| Fireplaces | Two or More, Gas, Gas Log, Living Room, Family Room |
| Stories | Four |
Exterior
| Exterior Features | Sprinkler System, Oversized Garage |
|---|---|
| Lot Description | Wooded, Evergreen Trees, Deciduous Trees, Sloping Lot, Abuts Ditch, Abuts Public Open Space, House Faces East, Paved, Water Rights Included |
| Roof | Composition |
| Construction | Frame, Wood Siding |
School Information
| District | Boulder Valley Dist RE2 |
|---|---|
| Elementary | Foothill |
| Middle | Centennial |
| High | Boulder |
Additional Information
| Days on Market | 173 |
|---|---|
| Zoning | SFR |
| Foreclosure | No |
| Short Sale | No |
| RE / Bank Owned | No |
Listing Details
| Agent | Kathleen Haas |
|---|---|
| Office | Colorado Realty 4 Less, LLC |