1125 Maxwell Avenue, Boulder, CO

$2,625,250

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4

Beds

5

Baths

3,252

Square feet

0.10

Acres

About 1125 Maxwell Avenue

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.

Features of 1125 Maxwell Avenue

MLS® # IR1067914
Price $2,625,250
Bedrooms 4
Bathrooms 5.00
Full Baths 3
Half Baths 1
Square Footage 3,252
Acres 0.10
Year Built 1922
Type Residential
Sub-Type Single Family Residence
Style Cottage
Status Active

Community Information

Address 1125 Maxwell Avenue
Subdivision Mapleton Hill
City Boulder
County Boulder
State CO
Zip Code 80304

Amenities

Utilities Electricity Available, Natural Gas Available
Parking Spaces 3
# of Garages 3
Is Waterfront No
Has Pool No

Interior

Interior Features Eat-in Kitchen, Open Floorplan
Appliances Dishwasher, Disposal, Dryer, Microwave, Oven, Refrigerator, Washer
Heating Hot Water
Cooling Air Conditioning-Room
Fireplace No
Stories One

Exterior

Exterior Features Balcony
Lot Description Rolling Slope, Sprinklers In Front
Windows Double Pane Windows, Skylight(s)
Roof Composition

School Information

District Boulder Valley RE 2
Elementary Whittier E-8
Middle Casey
High Boulder

Additional Information

Date Listed September 4th, 2026
Zoning RMX-1
Foreclosure No
Short Sale No
RE / Bank Owned No

Listing Details

OfficeThe Colorado Group
Contact Info3034492131

Listing Map

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