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$5,395,000

  • For Sale
  • Active
  • Single Family
  • 4 Beds
  • 2 Full Baths
  • 1 Partial Bath
  • 3,926 Sq. Ft.
  • 2 Car Garage
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643 Mapleton Ave, Boulder, COVideo Tour of 643 Mapleton Ave, Boulder, CO.
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.

Full Property Details for 643 Mapleton Ave

General

  • Price: $5,395,000
  • Taxes: $18,826 (2024)
  • Status: Active
  • Type: Single Family
  • Source: IRES
  • MLS ID: 1044438
  • Updated: 12/17/2025
  • Added to Site: 183 day(s) ago

Interior

  • Interior Features: Eat-In Kitchen, Separate Dining Room, Cathedral Ceiling(s), Open Floorplan, Wood Windows, Bay or Bow Window, Walk-In Closet(s), Wet Bar, Washer/Dryer Hookup, Skylights, Kitchen Island, Steam Shower, High Ceilings, Beamed Ceilings, Crown Molding
  • Fireplace: Yes
  • Fireplace(s): Free Standing, Two or More, Gas, Living Room, Basement
  • Appliances: Gas Range, Self Cleaning Oven, Dishwasher, Refrigerator, Bar Fridge, Washer, Dryer, Freezer, Gas Bar-B-Q, Disposal, Fire Alarm
  • Flooring: Wood

Rooms

Bathrooms

  • Total Bathrooms: 3
  • Full Bathrooms: 2
  • 3/4 Bathrooms: 1

Bedrooms

  • Total Bedrooms: 4

Additional Information

  • Pool: Yes
  • Pool Description: Private
  • Security/Safety: Fire Alarm

Exterior

  • Exterior Features: Sprinkler System
  • Porch/Patio/Deck: Patio, Deck, Enclosed

Parking

  • Garage: Yes
  • Attached garage: Yes
  • Garage Spaces: 2
  • Parking Features: Garage Door Opener
  • Garage Description: Attached

Location

  • Area: Boulder
  • County: Boulder
  • Subdivision: Mapleton

School Information

  • School District: Boulder Valley Dist RE2
  • Elementary School: Whittier
  • Middle School: Casey
  • High School: Boulder

Heating & Cooling

  • Cooling Type: Central Air, Wall/Window Unit(s)
  • Heating Type: Forced Air, Hot Water, Wood Stove, Zoned, Radiant, Radiator, 2 or more Heat Sources

Utilities

  • Gas: Yes
  • Gas: Xcel
  • Sewer: Public Sewer
  • Water: City
  • Utility Description: Natural Gas Available, Electricity Available

Structural Information

  • Architectural Style: Victorian
  • Construction: Stone, Wood Shingle
  • Exterior Const.: Stone, Wood Shingle
  • Basement: Yes
  • Basement Desc.: Partially Finished, Walk-Out Access
  • Roof: Composition
  • Windows: Skylight(s), Window Coverings
  • Square Feet: 3,926
  • Sq. Ft. Source: Other
  • Living Area: 3,239 Sq. Ft.
  • Year Built: 1900

Lot Features

  • Property View: Hills
  • Lot Size (Acres): 0.15
  • Lot Size (Sq. Ft.): 6,332
  • Frontage: City Street
  • Fence: Yes
  • Lot Features: Corner Lot, Wooded, Level, Historic District, House Faces South, Paved, Sidewalks
  • Potential Use: Single-Family
  • Zoning: RES
  • Fencing (Description): Fenced, Dog Run/Kennel

Financial Considerations

  • Tax Amount: $18,826
  • Tax Year: 2024
  • Terms: Cash, Conventional

Disclosures and Reports

  • Special Conditions: Private Owner
  • Exclusions: Seller's personal property.
  • Property ID: R0008802

Listed by Compass - Boulder (303) 487-5472

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Listing agent

— 643 Mapleton Ave —

  • Compass - Boulder

    303-487-5472

3032426012

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 643 Mapleton Ave

School District:Boulder Valley School District Re-2
NameGradesDistance
Whittier Elementary School
2008 Pine Street, Boulder, CO 80302
K-51 mi
Casey Middle School
1301 High Street, Boulder, CO 80304
6-80.4 mi
Boulder High School
1604 Arapahoe Avenue, Boulder, CO 80302
9-120.9 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 643 Mapleton Ave Get Price Alerts and Save Property

Date
Details
Price
Change
Source
9/25/2025
Listed
$5,395,000
362.1%
MLS
1/05/2006
Sold
$1,167,500
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 643 Mapleton Ave

Year
Property Taxes
Change
Tax Assessment
Change
2025
$19,218
2%
$201,551
-6%
2024
$18,826
2%
$214,212
-2%
2023
$18,499
13%
$217,898
24%
2022
$16,358
5%
$176,148
-3%
2021
$15,598
—
$181,217
7%
2021
$15,598
8%
$169,198
—
2019
$14,502
12%
$169,198
13%
2018
$12,951
3%
$149,378
—
2017
$12,546
13%
$149,378
17%
2016
$11,094
6%
$128,156
—
2015
$10,505
11%
$128,156
16%
2014
$9,468
2%
$110,126
—
2013
$9,260
—
$110,126
—
View All
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

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NMLS#: 1598647

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Listed by Compass - Boulder (303) 487-5472

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643 Mapleton Ave, Boulder, CO 80304 (MLS# 1044438) is a Single Family property with 4 bedrooms, 2 full bathrooms and 1 partial bathroom. 643 Mapleton Ave is currently listed for $5,395,000 and was received on September 25, 2025. Want to learn more about 643 Mapleton Ave? Do you have questions about finding other Single Family real estate for sale in Boulder? You can browse all Boulder real estate or contact a Coldwell Banker agent to request more information.

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