There are multiple listings for this address:
Active

661 Maxwell Avenue, Boulder, CO, 80304

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MLS #REC8945445 image #0MLS #REC8945445 image #1MLS #REC8945445 image #2MLS #REC8945445 image #3MLS #REC8945445 image #4MLS #REC8945445 image #5MLS #REC8945445 image #6MLS #REC8945445 image #7MLS #REC8945445 image #8MLS #REC8945445 image #9MLS #REC8945445 image #10MLS #REC8945445 image #11MLS #REC8945445 image #12MLS #REC8945445 image #13MLS #REC8945445 image #14MLS #REC8945445 image #15MLS #REC8945445 image #16MLS #REC8945445 image #17MLS #REC8945445 image #18MLS #REC8945445 image #19MLS #REC8945445 image #20MLS #REC8945445 image #21MLS #REC8945445 image #22MLS #REC8945445 image #23MLS #REC8945445 image #24MLS #REC8945445 image #25MLS #REC8945445 image #26MLS #REC8945445 image #27MLS #REC8945445 image #28MLS #REC8945445 image #29MLS #REC8945445 image #30MLS #REC8945445 image #31MLS #REC8945445 image #32MLS #REC8945445 image #33MLS #REC8945445 image #34MLS #REC8945445 image #35MLS #REC8945445 image #36MLS #REC8945445 image #37MLS #REC8945445 image #38MLS #REC8945445 image #39MLS #REC8945445 image #40MLS #REC8945445 image #41MLS #REC8945445 image #42MLS #REC8945445 image #43MLS #REC8945445 image #44MLS #REC8945445 image #45MLS #REC8945445 image #46MLS #REC8945445 image #47MLS #REC8945445 image #48MLS #REC8945445 image #49

Open House Oct 17, 2026
11:00 – 02:00

661 Maxwell Avenue, Boulder, CO, 80304

5 Beds
6 Baths
4,687 SqFt
0.16 Acres

Listing Id

REC8945445
$4,975,000

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!)

Property Details
Price:
$4,975,000
MLS #:
REC8945445
Status:
Active
Beds:
5
Baths:
6
Type:
Single Family
Structure:
House
Subdivision:
Mapleton Hill
Finished Sq Ft:
4,111
Total Sq Ft:
4,687
Lot Size:
6,898 sqft / 0.16 acres (approx)
Year Built:
1910
Mapleton HillBoulder Valley Re 2Whittier Int’lCaseyBoulderMountain(s)
Interior
Above Grade Finished Area
3076
Appliances
Dishwasher, Disposal, Dryer, Microwave, Oven, Range, Refrigerator, Self Cleaning Oven, Washer
Bathrooms
2 Full Bathrooms, 3 Three Quarter Bathrooms, 1 Half Bathroom
Below Grade Finished Area
1035
Below Grade Unfinished Area
576
Cooling
Central Air
Fireplaces Total
1
Flooring
Concrete, Wood
Heating
Forced Air, Radiant
Interior Features
Ceiling Fan(s), Eat-in Kitchen, Open Floorplan, Pantry, Walk-In Closet(s)
Laundry Features
In Unit
Levels
Two
Main Level Bathrooms
2
Main Level Bedrooms
1
Exterior
Construction Materials
Brick
Fencing
Partial
Lot Features
Sprinklers In Front, Sprinklers In Rear
Patio And Porch Features
Deck, Patio
Roof
Composition
Security Features
Smoke Detector(s)
View
Mountain(s)
Schools
School District:
Boulder Valley RE 2
Elementary School:
Whittier Int’l
Middle School:
Casey
High School:
Boulder
Financial
Tax Year
2025
Taxes
$15,843

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661 Maxwell Avenue
Boulder, CO
Active

661 Maxwell Avenue, Boulder, CO, 80304

Add
MLS #RECIR1070334 image #0MLS #RECIR1070334 image #1MLS #RECIR1070334 image #2MLS #RECIR1070334 image #3MLS #RECIR1070334 image #4MLS #RECIR1070334 image #5MLS #RECIR1070334 image #6MLS #RECIR1070334 image #7MLS #RECIR1070334 image #8MLS #RECIR1070334 image #9MLS #RECIR1070334 image #10MLS #RECIR1070334 image #11MLS #RECIR1070334 image #12MLS #RECIR1070334 image #13MLS #RECIR1070334 image #14MLS #RECIR1070334 image #15MLS #RECIR1070334 image #16MLS #RECIR1070334 image #17MLS #RECIR1070334 image #18MLS #RECIR1070334 image #19MLS #RECIR1070334 image #20MLS #RECIR1070334 image #21MLS #RECIR1070334 image #22MLS #RECIR1070334 image #23MLS #RECIR1070334 image #24MLS #RECIR1070334 image #25MLS #RECIR1070334 image #26MLS #RECIR1070334 image #27MLS #RECIR1070334 image #28MLS #RECIR1070334 image #29MLS #RECIR1070334 image #30MLS #RECIR1070334 image #31MLS #RECIR1070334 image #32MLS #RECIR1070334 image #33MLS #RECIR1070334 image #34MLS #RECIR1070334 image #35MLS #RECIR1070334 image #36MLS #RECIR1070334 image #37MLS #RECIR1070334 image #38MLS #RECIR1070334 image #39MLS #RECIR1070334 image #40MLS #RECIR1070334 image #41MLS #RECIR1070334 image #42MLS #RECIR1070334 image #43MLS #RECIR1070334 image #44MLS #RECIR1070334 image #45MLS #RECIR1070334 image #46MLS #RECIR1070334 image #47MLS #RECIR1070334 image #48MLS #RECIR1070334 image #49

Open House Oct 17, 2026
11:00 – 02:00

661 Maxwell Avenue, Boulder, CO, 80304

5 Beds
6 Baths
4,687 SqFt
0.16 Acres

Listing Id

RECIR1070334
$4,975,000

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!)

Property Details
Price:
$4,975,000
MLS #:
RECIR1070334
Status:
Active
Beds:
5
Baths:
6
Type:
Single Family
Structure:
House
Subdivision:
Mapleton Hill
Finished Sq Ft:
4,111
Total Sq Ft:
4,687
Lot Size:
6,898 sqft / 0.16 acres (approx)
Year Built:
1910
Mapleton HillBoulder Valley Re 2Whittier Int’lCaseyBoulderMountain(s)
Interior
Above Grade Finished Area
3076
Appliances
Dishwasher, Disposal, Dryer, Microwave, Oven, Range, Refrigerator, Self Cleaning Oven, Washer
Bathrooms
2 Full Bathrooms, 3 Three Quarter Bathrooms, 1 Half Bathroom
Below Grade Finished Area
1035
Below Grade Unfinished Area
576
Cooling
Central Air
Fireplaces Total
1
Flooring
Concrete, Wood
Heating
Forced Air, Radiant
Interior Features
Ceiling Fan(s), Eat-in Kitchen, Open Floorplan, Pantry, Walk-In Closet(s)
Laundry Features
In Unit
Levels
Two
Main Level Bathrooms
2
Main Level Bedrooms
1
Exterior
Construction Materials
Brick
Fencing
Partial
Lot Features
Sprinklers In Front, Sprinklers In Rear
Patio And Porch Features
Deck, Patio
Roof
Composition
Security Features
Smoke Detector(s)
View
Mountain(s)
Schools
School District:
Boulder Valley RE 2
Elementary School:
Whittier Int’l
Middle School:
Casey
High School:
Boulder
Financial
Tax Year
2025
Taxes
$15,843

Need more info?

Ask a Question

Ready to go see it?

Schedule a Showing

Similar Listings

broker reciprocity
MLS# RECIR1042948broker reciprocity
515 Alpine Avenue
Boulder, CO

$5,995,000

0.3 miles away

broker reciprocity
MLS# RECIR1070660broker reciprocity
1344 Weaver Drive #& 470
Boulder, CO

$5,900,000

3.4 miles away

broker reciprocity
MLS# RECIR1054641broker reciprocity
1050 Pine Gold Hill Street
Boulder, CO

$5,850,000

1.5 miles away

Share this Property