3421 4th Street Boulder, CO ^$ 7,250,000

3421 4th Street

^$ 7,250,000

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Open House 12/7 12pm - 4pm

3421 4th Street

Boulder, CO, 80304

^$ 7,250,000

Bedrooms6 Baths4.1 Sq 5,198

Monthly Estimate*

^$ 45,231

Listed by Colorado Realty 4 Less, LLC

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Single Family Home for sale in Boulder, CO

for $7,250,000 with 6 bedrooms and 4 full baths, 1 half bath. This 5,198 square foot home was built in 1990 on a lot size of 0.6.

Once-in-a-generation chance to own a Newlands sanctuary backing directly to Mt. Sanitas. On open space - one of only eight homes on 4th St. with this privilege. Tucked up a private, tree-lined drive, the 5,200 sq ft residence sits on a rare 0.6-acre garden oasis framed by apple trees, lavender beds, and the historic Silver Lake Ditch. Inside, light pours through west-facing walls of glass and 20-ft ceilings, capturing ever-changing mountain panoramas. Oak floors run throughout the main level, complementing the warmth of two fireplaces - one in the dramatic living room, another in the cozy library. The flexible layout offers six bedrooms plus an office, highlighted by two king-sized primary suites (one on the top floor, one garden-level with 12.5-ft ceilings, private patio, and separate entrance) - ideal for multigenerational living, guests, or an au pair. Gather in the open kitchen that flows into living and dining areas, spill onto the wrap-around porch for morning coffee under a 60-ft maple, then follow your own gate straight to miles of trail. Evenings bring alpenglow views, cider-press parties with fruit from your orchard, and starlit conversations with a cricket chorus. Secluded yet minutes to Pearl St., Ideal Market, and Boulder's top-rated schools. Newlands is prized for its friendly vibe, where neighbors walk dogs and ride bikes along peaceful, tree-lined streets, gathering for block parties and bonding over a shared love of the outdoors. Homes that touch open space here rarely trade hands. If you've been waiting for privacy, views, and community in one package, this is the opportunity.

Open House

12/7/2025 12:00 PM - 4:00 PM

3421 4th Street Boulder, CO

* Some states or local ordinances may prohibit Open Houses at this time, please confirm with your Weichert agent or local rep to confirm

Single Family Active

Price

^$ 7,250,000

Bedrooms

Full Bath

Half Bath

Property Type

Single Family

Taxes

^$ 26,869

Style

Contemporary

Lot Size

0.6

Year Built

1990

Town/City

Boulder

County/Region

Boulder

MLS | Web ID

IR1037712

Features

Interior

Interior Amenities Eat-in Kitchen Five Piece Bath Open Floorplan Vaulted Ceiling(s) Walk-In Closet(s)

Basement Daylight Full

Flooring Wood

Fireplace Features Family Room Gas Gas Log Living Room

Basement (Y/N) Y

Window Features Double Pane Windows

Above Grade Finished Area 3927

Half Baths 1

3/4 Baths 2

Laundry Features In Unit

Total Bedrooms 6

Below Grade Finished Area 1271

Main Level Bedrooms 1

Main Level Bathrooms 2

Total Baths 5

General

Sewer Public Sewer

Heating Forced Air Hot Water Radiant

Cooling Ceiling Fan(s) Evaporative Cooling

Utilities Cable Available Electricity Available Internet Access (Wired) Natural Gas Available

Possession Close Plus 3 Days

Roof Composition

Appliances Dishwasher Disposal Down Draft Microwave Oven Refrigerator Self Cleaning Oven

Zoning RR-2

Garage Spaces 2

Patio/Porch Features Deck Patio

Architectural Style Contemporary

Security Features Smoke Detector(s)

Construction Materials Frame Wood Siding

Exclusions Furniture and Personal Property

Year Built 1990

View Mountain(s)

Levels Three Or More

Property Subtype Single Family Residence

Tax Year 2024

County Boulder

Property Type Residential

HOA N

Attached Garage Y

Subdivision Name Fourth Street 3403 Sub

Facing Direction East

Possible Use Residential

Full Baths 2

Status Active

Directions From Broadway turn west on Juniper Ave. Turn rt on 4th St. property on left side

High School Boulder

City Boulder

High School District Boulder Valley RE 2

Lot Size Square Feet 26072

Listing Terms 1031 Exchange Cash Conventional

Spa Features Bath

Elementary School Foothill

Tax Annual Amount 26869

Middle/Junior High School Centennial

Concessions No

Structure Type House

Standard Status Active

Occupancy Type Owner

Elementary School District Boulder Valley RE 2

Exterior

Vegetation Wooded

Fencing Fenced Partial

Parking Features Oversized

Lot Features Ditch Open Space Rolling Slope Sprinklers In Front

Water Source Public

Total Parking 2

Building Area Total 5198

Lot Size Acres 0.6

Road Surface Type Paved

Road Frontage Type Public

Internal Only

Street Number 1 3421

* Excluded Features

List By

Colorado Realty 4 Less, Llc

Broker

(970) 531-7448

Phone

Affordability Calculator

$47,470

Per Month

Monthly Principal & Interest: $45,231
Monthly Property Taxes: $2,239
Monthly Home Insurance: --

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Down Payment

Loan Term

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Yearly Home Insurance

Default based on a 30-year fixed rate of 6.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

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Nearby

Trends
Schools

Single family listings in Boulder, CO

Average List Price ^$2,493,570

Percent of Sale Price 66%

About Boulder, CO

102,151 Population

6% Since 2002

^$65,436 Median Income

31.88 Median Age

18% Households with Children

View more area information

Trends Information provided by ATTOM Data Solutions.

1955676 Elementary School

1955871 Middle School

Boulder High School High School

See complete school information

Pricing History

Date	Price	Price Change	Description
6/26/2025	$7,250,000		Listed Price

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3421 4th Street, Boulder, CO, 80304 is a Single Family Home for sale at $7,250,000 with 5,198 sqft and a lot size of 0.6. 3421 4th Street has 6 bedrooms, 4.1 baths, and was built in 1990. The property's zip code is 80304 which is in Boulder, CO

*Information deemed reliable but not guaranteed.

Financial calculator disclaimer: Default based on a 30-year fixed rate of 6.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

The data relating to real estate on this web site comes in part from the Internet Data eXchange (IDX) Program of the REcolorado. Real estate listings held by firms other than Weichert Realtors are marked with the IDX logo and detailed information about them includes the Listing Broker’s Firm Name.

The information being provided is 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.

Data is updated as of 12/7/2025.

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PUBLISHER’S NOTICE: All real estate advertised herein is subject to the Federal Fair Housing Act and the Colorado Fair Housing Act, which Acts make it illegal to make or publish any advertisement that indicates any preference, limitation, or discrimination based on race, color, religion, sex, handicap, familial status, or national origin.

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3421 4th Street

Single Family Home for sale in Boulder, CO

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