1125 Maxwell Avenue
Boulder, CO, 80304 $ 2,450,500
Bedrooms4 Baths4.1 Sq 3,252 Monthly Estimate*
$ 16,925
Listed by The Colorado Group
for $2,450,500 with 4 bedrooms and 4 full baths, 1 half bath. This 3,252 square foot home was built in 1922 on a lot size of 0.1.
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.
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FeaturesGeneralLiving Area 3252
Sewer Public Sewer
Heating Hot Water
Cooling Air Conditioning-Room
Utilities Electricity Available Natural Gas Available
Roof Composition
Appliances Dishwasher Disposal Dryer Microwave Oven Refrigerator Washer
Zoning RMX-1
Garage Spaces 3
Patio/Porch Features Deck Patio
Architectural Style Cottage
Construction Materials Block Stucco Wood Frame
Year Built 1922
Levels One
Property Subtype Single Family Residence
Parcel Number R0006468
County Boulder
Property Type Residential
HOA N
Attached Garage N
Subdivision Name Mapleton Hill
Facing Direction South
Possible Use Multi-Family Residential
Full Baths 3
Directions Broadway and Maxwell (West side of Broadway)
High School Boulder
City Boulder
Senior Community Y/N N
High School District Boulder Valley RE 2
Lot Size Square Feet 4472
Elementary School Whittier E-8
Property Attached Y/N N
Tax Annual Amount 14768
Middle/Junior High School Casey
Standard Status Active
Elementary School District Boulder Valley RE 2
Freehold IDX
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InteriorInterior Amenities Eat-in Kitchen Open Floorplan
Basement Full Walk-Out Access
Flooring Wood
Window Features Double Pane Windows Skylight(s)
Half Baths 1
3/4 Baths 1
Total Bedrooms 4
Total Baths 5
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ExteriorExterior Amenities Balcony
Lot Features Rolling Slope Sprinklers In Front
Water Source Public
Lot Size Acres 0.1
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* Excluded FeaturesAffordability Calculator
- Monthly Principal & Interest
- $16,925
- Monthly Property Taxes
- $1,231
- 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 $2,207,007
Percent of Sale Price 10%
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.
3187605 Elementary School
1955678 Middle School
Boulder High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 10/7/2026 | $2,450,500 | -6.66% | Price Down |
| 9/3/2026 | $2,625,250 | | Listed Price |