Recently Listed Open House 10/17 11am - 2pm
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
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.
OPEN SATURDAY 11 AM - 2 PM! 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!)
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Open House
10/17/2026 11:00 AM - 2:00 PM
661 Maxwell Avenue 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
FeaturesGeneralLiving Area 4111
Sewer Public Sewer
Heating Forced Air Radiant
Cooling Central Air
Utilities Natural Gas Connected
Roof Composition
Appliances Dishwasher Disposal Dryer Microwave Oven Range Refrigerator Self Cleaning Oven Washer
Zoning Res
Garage Spaces 0
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
Full Baths 2
High School Boulder
City Boulder
Senior Community Y/N N
High School District Boulder Valley RE 2
Lot Size Units Square Feet
Lot Size Square Feet 6898
Carport Spaces 0
Elementary School Whittier Int'l
Property Attached Y/N N
Tax Annual Amount 15843
Middle/Junior High School Casey
Standard Status Active
Middle/Junior School District Boulder Valley RE 2
Elementary School District Boulder Valley RE 2
Freehold IDX
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InteriorInterior Amenities Ceiling Fan(s) Eat-in Kitchen Open Floorplan Pantry Walk-In Closet(s)
Basement Finished Full Unfinished Walk-Out Access
Flooring Concrete Wood
Total Fireplaces 1
Fireplace Features Gas Living Room
Half Baths 1
1/4 Baths 0
3/4 Baths 3
Laundry Features In Unit
Total Bedrooms 5
Total Baths 6
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ExteriorFencing Partial
Lot Features Sprinklers In Front Sprinklers In Rear
Water Source Public
Lot Size Area 6898
Lot Size Acres 0.16
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* Excluded FeaturesList ByKarolyn.coRealtor@gmail.com,303-817-2827Contact
Affordability Calculator
- Monthly Principal & Interest
- $34,361
- Monthly Property Taxes
- $1,320
- Monthly Home Insurance
- --
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.
Learn more about how to save NearbySingle family listings in Boulder, CO
Average List Price $2,227,807
Percent of Sale Price 55%
About Boulder, CO 102,151 Population
6% Since 2002
$ 65,436 Median Income
31.88 Median Age
18% Households with Children
Trends Information provided by ATTOM Data Solutions.
3043878 Elementary School
1955678 Middle School
Boulder High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 10/16/2026 | $4,975,000 | | Listed Price |