Date
Details
Price
Change
Source
9/04/2026
Listed
$2,625,250
—
MLS
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.
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Property Description
The Allen Residence. Built in 1922 on Boulder's historic Mapleton Hill, this Craftsman bungalow is a legally conforming duplex, income-ready from day one. The main home features original Douglas Fir floors, 6 panel doors, Craftsman casework, 3 beds, 2 3/4 baths, a covered front porch on tapered brick piers, and a skylit finished attic with charming flex space. Tucked below is a fully finished walk-out garden level apartment, a true second unit with its own private, entrance on the east side and separately metered is ready for a tenant, guests, or a standalone private suite. Out back, a detached 3-car garage (rare on this end of Mapleton Hill) is topped by a 612 SF studio currently with a half bath, convertible to full, with light and bright, living space under current Boulder zoning for a third income stream. RMX-1 zoning supports single-family, duplex, or triplex use across the property's two structures. The finished interior living space totals 3,252 SF, with an additional 374 SF of outdoor living space, 612 SF of parking, with a complimentary 120 SF in the storage shed. All major systems have been updated during current ownership, including electrical, plumbing, hot water heat, windows, and roof. Highly walkable location (87 Walk Score) places the Ideal Market, North Boulder Park, Mount Sanitas, downtown Boulder and Pearl Street, Boulder Creek Path, CU Boulder, and an RTD bus route all within an easy walk or bike ride. The home sits next door to one of Boulder's architecturally acclaimed buildings designed by Charles Haertling, originally known as the Boulder Valley Eye Clinic. This is a rare shot at owning a piece of Boulder history with real, flexible upside.
Full Property Details
Full Property Details for 1125 Maxwell Ave
General
- Price: $2,625,250
- Taxes: $14,768 (2025)
- Status: Active
- Type: Single Family
- Source: IRES
- MLS ID: 1067914
- Updated: 9/4/2026
- Added to Site: 6 day(s) ago
Interior
- Interior Features: Eat-In Kitchen, Separate Dining Room, Open Floorplan, Skylights, 6-Panel Doors
- Appliances: Electric Range, Gas Range, Dishwasher, Refrigerator, Washer, Dryer, Microwave, Some Furniture, Disposal, Fire Alarm
- Flooring: Wood
Rooms
Bathrooms
- Total Bathrooms: 5
- Full Bathrooms: 3
- 3/4 Bathrooms: 1
- Half Bathrooms: 1
- Main Floor Baths: 1
- Basement Baths: 1
Bedrooms
- Total Bedrooms: 4
Exterior
- Exterior Features: Sprinkler System, Balcony
- Porch/Patio/Deck: Patio, Deck
Parking
- Garage: Yes
- Garage Spaces: 3
- Parking Features: Garage Door Opener, Detached
- Garage Description: Detached
Location
- Area: Boulder
- County: Boulder
- Subdivision: Mapleton Hill
- Driving Directions: Broadway and Maxwell (West side of Broadway)
School Information
- School District: Boulder Valley Dist RE2
- Elementary School: Whittier
- Middle School: Casey
- High School: Boulder
Heating & Cooling
- Cooling Type: Wall/Window Unit(s)
- Heating Type: Hot Water
Utilities
- Gas: Yes
- Gas: Xcel
- Sewer: Public Sewer
- Water: City
- Utility Description: Natural Gas Available, Electricity Available
Structural Information
- Architectural Style: Cottage, Includes Rental Unit, Legal Conforming
- Model: Bungalow
- Construction: Frame, Block, Stucco
- Exterior Const.: Frame, Block, Stucco
- Basement: Yes
- Basement Desc.: Full, Partially Finished, Walk-Out Access
- Roof: Composition
- Windows: Skylight(s)
- Square Feet: 3,252
- Sq. Ft. Source: Assessor
- Living Area: 3,252 Sq. Ft.
- Year Built: 1922
Additional Structures
- Other Structures: Storage
Lot Features
- Lot Size (Acres): 0.1
- Lot Size (Sq. Ft.): 4,472
- Fence: Yes
- Lot Features: Deciduous Trees, Sloping Lot, House Faces South
- Potential Use: Single-Family, Multi-Family
- Zoning: RMX-1
- Fencing (Description): Fenced
Green Features
- Energy Efficient: Windows
Financial Considerations
- Tax Amount: $14,768
- Tax Year: 2025
- Terms: Cash, Conventional
Disclosures and Reports
- Special Conditions: Licensed Owner
- Property ID: R0006468
Listed by The Colorado Group (303) 449-2131
We Value Your Privacy
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Listing agent
— 1125 Maxwell Ave —
The Colorado Group
303-449-2131
3034492131
NMLS#: 1598647Get Pre-Approved Today
Schools
Schools serving 1125 Maxwell Ave
School District:Boulder Valley School District Re-2
| Name | Grades | Distance |
|---|---|---|
Whittier Elementary School 2008 Pine Street, Boulder, CO 80302 | K-5 | 0.7 mi |
Casey Middle School 1301 High Street, Boulder, CO 80304 | 6-8 | 0.1 mi |
Boulder High School 1604 Arapahoe Avenue, Boulder, CO 80302 | 9-12 | 0.7 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 1125 Maxwell Ave
Tax History
Tax History for 1125 Maxwell Ave
Year
Property Taxes
Change
Tax Assessment
Change
2025
$14,768
-2%
$166,675
-2%
2024
$15,061
2%
$169,577
-2%
2023
$14,794
35%
$173,262
38%
2021
$10,987
-3%
$125,905
5%
2022
$11,270
3%
$119,741
4%
2021
$10,987
47%
$114,801
33%
2018
$7,489
3%
$86,379
—
2017
$7,255
-26%
$86,379
-25%
2019
$9,840
32%
$114,801
34%
2016
$7,443
6%
$85,984
—
2015
$7,048
13%
$85,984
19%
2014
$6,221
2%
$72,356
—
2013
$6,084
—
$72,356
—
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.
Estimate the Cost
Estimate the Cost for 1125 Maxwell Ave
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Sold by The Agency - Boulder
Sold by The Agency - Boulder
1125 Maxwell Ave, Boulder, CO 80304 (MLS# 1067914) is a Single Family property with 4 bedrooms, 3 full bathrooms and 2 partial bathrooms. 1125 Maxwell Ave is currently listed for $2,625,250 and was received on September 04, 2026. Want to learn more about 1125 Maxwell 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.