661 Maxwell Avenue Boulder, CO ^$ 4,975,000

661 Maxwell Avenue

^$ 4,975,000

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661 Maxwell Avenue

Boulder, CO, 80304

^$ 4,975,000

Bedrooms5 Baths5.1 Sq 4,111

Monthly Estimate*

^$ 34,361

Listed by RE/MAX of Boulder, Inc

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Single Family Home for sale in Boulder, CO

for $4,975,000 with 5 bedrooms and 5 full baths, 1 half bath. This 4,111 square foot home was built in 1910 on a lot size of 0.16.

A rare find in Mapleton Hill! Beautifully remodeled down to the studs in 2020 and complemented by a brand-new $1,000,000 ADU, this unique home brings together historic charm, gorgeous modern finishes and exceptional flexibility.Filled with natural light, the home offers an inviting flow with spaces that feel both connected and comfortable. Exposed brick adds warmth and character, while hardwood floors and thoughtfully chosen finishes create a cohesive feel throughout. The custom kitchen is a standout, featuring Wolf appliances, a Sub-Zero refrigerator and a charming built-in corner table-the perfect gathering spot for morning coffee or a casual meal.The main level includes a spacious study, a bedroom, a full bath and a powder room, providing wonderful options for guests and working from home. An elegant staircase with custom treads and metal detailing leads upstairs to the primary suite, where a generous deck captures foothill views and beautiful sunsets. It's a lovely place to start the day or unwind in the evening.The walkout lower level expands the living space with a recreation room, two additional bedrooms and a three-quarter bath, offering room to spread out and host guests comfortably.Adding to this exceptional property is the brand-new ADU with high end finish, bringing another dimension to the home's versatility and appeal. Walk to the Mount Sanitas trails for a morning hike or head to Pearl Street for shopping, dining and all the energy of downtown Boulder. With its blend of timeless character, modern comfort and a coveted Mapleton Hill setting, 661 Maxwell captures the best of Boulder living and with the Sundance Film Festival coming to Boulder in 2027, this location offers even more to look forward to.The main house is 3048 sq ft. ADU 1063 with a separate entrance basement 576 sq ft (great for storage!)

Single Family Coming Soon

Price

^$ 4,975,000

Bedrooms

Full Bath

Half Bath

Property Type

Single Family

Taxes

^$ 15,843

Style

Single Family Residence

Lot Size

0.16

Year Built

1910

Town/City

Boulder

County/Region

Boulder

MLS | Web ID

IR1070334

Features

General

Living Area 4111

Sewer Public Sewer

Heating Forced Air Radiant

Cooling Ceiling Fan(s) Central Air

Utilities Natural Gas Available

Roof Composition

Appliances Dishwasher Disposal Dryer Microwave Oven Refrigerator Self Cleaning Oven Washer

Zoning Res

Patio/Porch Features Deck Patio

Construction Materials Brick

Year Built 1910

View Mountain(s)

Levels Two

Property Subtype Single Family Residence

Parcel Number R0008550

County Boulder

Property Type Residential

HOA N

Attached Garage N

Subdivision Name Mapleton Hill

Possible Use Multi-Family Residential

Full Baths 2

High School Boulder

City Boulder

Senior Community Y/N N

High School District Boulder Valley RE 2

Lot Size Square Feet 6898

Elementary School Whittier E-8

Property Attached Y/N N

Tax Annual Amount 15843

Middle/Junior High School Casey

Virtual Tour https://www.listingsmagic.com/sps/tour-slider/index.php?property_ID=286637

Standard Status Coming Soon

Elementary School District Boulder Valley RE 2

Freehold IDX

Interior

Interior Amenities Eat-in Kitchen In-Law Floorplan Open Floorplan Pantry Walk-In Closet(s)

Basement Full Unfinished Walk-Out Access

Flooring Wood

Fireplace Features Gas Living Room

Half Baths 1

3/4 Baths 3

Laundry Features In Unit

Total Bedrooms 5

Total Baths 6

Exterior

Fencing Partial

Lot Features Sprinklers In Front

Water Source Public

Lot Size Acres 0.16

* Excluded Features

List By

Re/Max Of Boulder, Inc

Broker

3034415642

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Affordability Calculator

$35,681

Per Month

Monthly Principal & Interest: $34,361
Monthly Property Taxes: $1,320
Monthly Home Insurance: --

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Default based on a 30-year fixed rate of 7.375% 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 ^$2,202,057

Percent of Sale Price 56%

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
10/9/2026	$4,975,000		Listed Price

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661 Maxwell Avenue, Boulder, CO, 80304 is a Single Family Home for sale at $4,975,000 with 4,111 sqft and a lot size of 0.16. 661 Maxwell Avenue has 5 bedrooms, 5.1 baths, and was built in 1910. 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 7.375% 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 10/10/2026.

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661 Maxwell Avenue

Single Family Home for sale in Boulder, CO

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