643 Mapleton Avenue Boulder, CO ^$ 5,395,000

643 Mapleton Avenue

^$ 5,395,000

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643 Mapleton Avenue

Boulder, CO, 80304

^$ 5,395,000

Bedrooms4 Baths3.0 Sq 3,926

Monthly Estimate*

^$ 33,218

Listed by Compass - Boulder

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Single Family Home for sale in Boulder, CO

for $5,395,000 with 4 bedrooms and 3 full baths. This 3,926 square foot home was built in 1900 on a lot size of 0.15.

Seller Financing Available. The beautifully preserved past meets the exciting present in this carefully updated and diligently maintained historic Mapleton Hill home. This fine Boulder 4BD/3BA landmark awaits its next generation of lucky residents with an expansive modernized layout, a wealth of original and period-appropriate architectural details, and phenomenal poolside outdoor space. Built in 1895, The Law House is a Gothic Revival masterpiece built from stone quarried from Mt. Sanitas. Inside, you'll find tall tin ceilings, original fir floors, stained glass windows and exceptional millwork paired with thoughtfully selected lighting, windows and doors, Cleveland Art and Antiques handblown light fixtures and Sonos speakers. A charming covered porch and gracious foyer open to a sun-kissed layout perfect for peaceful relaxation and lavish entertaining, including a fireplace living room, elegant formal dining room and a stately library with breathtaking woodwork, a Murphy bed and a hidden passageway to both the lower and upper levels. The open gourmet kitchen boasts a skylight, custom cabinetry, honed raw-edge Australian granite and upscale appliances, while an adjacent guest bath and laundry room add convenience. Grill masters will love the large deck's Lynx summer kitchen. Below, the newer saltwater jetted pool spa is surrounded by manicured gardens and tall trees for optimal privacy. A handsome fir staircase leads to the upper-level private quarters, including a luxurious owner's suite with a spa bath and walk-in closet. Two secondary bedrooms & a full bath complete the top floor, while the walkout basement provides a vast footprint for media room, home gym & game room use. Completely remodeled in 2006, the home includes upper-level HVAC and mini-split/radiant heat on the main and lower levels. Plans are available for a primary bathroom and closet remodel and a basement expansion with a depth increase. Coveted Mapleton Hill Historic District close to EVERYTHING.

Single Family Active

Price

^$ 5,395,000

Bedrooms

Full Bath

Property Type

Single Family

Taxes

^$ 18,826

Style

Victorian

Lot Size

0.15

Year Built

1900

Town/City

Boulder

County/Region

Boulder

MLS | Web ID

IR1044438

Features

Interior

Interior Amenities Eat-in Kitchen Kitchen Island Open Floorplan Vaulted Ceiling(s) Walk-In Closet(s) Wet Bar

Basement Walk-Out Access

Flooring Wood

Fireplace Features Basement Free Standing Gas Living Room

Basement (Y/N) Y

Window Features Bay Window(s) Skylight(s) Window Coverings

Above Grade Finished Area 3239

Half Baths 0

3/4 Baths 1

Laundry Features In Unit

Total Bedrooms 4

Below Grade Finished Area 0

Main Level Bedrooms 1

Main Level Bathrooms 1

Total Baths 3

General

Sewer Public Sewer

Heating Forced Air Hot Water Radiant Wood Stove

Cooling Air Conditioning-Room Central Air

Utilities Electricity Available Natural Gas Available

Possession Closing/DOD

Roof Composition

Appliances Bar Fridge Dishwasher Disposal Dryer Freezer Oven Refrigerator Self Cleaning Oven Washer

Zoning RES

Garage Spaces 2

Patio/Porch Features Deck Patio

Architectural Style Victorian

Pool Features Private

Security Features Fire Alarm Smoke Detector(s)

Construction Materials Stone Wood Siding

Exclusions Seller's personal property.

Year Built 1900

View Mountain(s)

Levels Two

Property Subtype Single Family Residence

Tax Year 2024

Ownership Individual

County Boulder

Property Type Residential

HOA N

Attached Garage Y

Subdivision Name Mapleton

Facing Direction South

Possible Use Residential

Full Baths 2

Status Active

High School Boulder

City Boulder

High School District Boulder Valley RE 2

Lot Size Square Feet 6332

Listing Terms Cash Conventional

Elementary School Whittier E-8

Tax Annual Amount 18826

Middle/Junior High School Casey

Concessions No

Virtual Tour https://www.youtube.com/watch?v=AJcTVqfV5-I

Structure Type House

Standard Status Active

Occupancy Type Owner

Elementary School District Boulder Valley RE 2

Exterior

Exterior Amenities Dog Run Gas Grill

Vegetation Wooded

Lot Features Corner Lot Historical District Level Sprinklers In Front

Water Source Public

Total Parking 2

Building Area Total 3926

Lot Size Acres 0.15

Road Surface Type Paved

Road Frontage Type Public

Internal Only

Street Number 1 643

* Excluded Features

List By

Compass - Boulder

Broker

(303) 242-6012

Phone

Affordability Calculator

$34,787

Per Month

Monthly Principal & Interest: $33,218
Monthly Property Taxes: $1,569
Monthly Home Insurance: --

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Down Payment

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Default based on a 30-year fixed rate of 6.25% 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 ^$2,778,729

Percent of Sale Price 48%

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.

3187605 Elementary School

1955678 Middle School

Boulder High School High School

See complete school information

Pricing History

Date	Price	Price Change	Description
9/25/2025	$5,395,000		Listed Price

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643 Mapleton Avenue, Boulder, CO, 80304 is a Single Family Home for sale at $5,395,000 with 3,926 sqft and a lot size of 0.15. 643 Mapleton Avenue has 4 bedrooms, 3.0 baths, and was built in 1900. 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 6.25% 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 1/25/2026.

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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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643 Mapleton Avenue

Single Family Home for sale in Boulder, CO

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