1125 Maxwell Avenue, Boulder, CO 80304 | $2,450,500 – MLS# IR1067914

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1125 Maxwell Avenue
Boulder, CO 80304
5 days ago REDUCED · Active
$2,450,500
$754 / Sqft
4
Beds
5
Baths
3
Garage
3,252
Sqft
0.10
Acres
MLS# IR1067914
Cumulative Days on Market: 40 · Includes prior listings · Currently listed since 09/03/26 · Data provided by the MLS.

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.

Property Highlights

Property Type
Residential
Property Sub Type
Single Family Residence
Architectural Style
Cottage
Bedrooms
4
Total Bathrooms
5
Living Area
3,252
Price / Sqft
$754
Acres
0.10
Year Built
1922

Location

City/Township
Boulder
Direction Faces
South
Subdivision
Mapleton Hill
County
Boulder
Zoning
RMX-1

Property Details

Price
$2,450,500
Property Type
Residential
Property Sub Type
Single Family Residence

Building

Structure Type
House
Levels
One
Total Area
3,252

Community

Local Schools

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

Interior Features

Bedrooms and Bathrooms

Total Bathrooms
5
Bathrooms on Main Level
1
Full Bathrooms
3
1/2 Bathrooms
1
3/4 Bathrooms
1
Bedrooms
4
Bedrooms on Main Level
2

Rooms and Basement

Has Basement
Yes
Basement Features
Full, Walk-Out Access

Area and Spaces

Living Area
3,252
Above Grade Finished Area
2,162
Below Grade Finished Area
1,090

Appliances

Appliances
Dishwasher, Disposal, Dryer, Microwave, Oven, Refrigerator, Washer

Interior Features

Interior Features
Eat-in Kitchen, Open Floorplan
Flooring
Wood
Window Features
Double Pane Windows, Skylight(s)
Security Features
Smoke Detector(s)

Heating and Cooling

Heating Features
Hot Water

Building Details

Construction

Architectural Style
Cottage
Builders Model
Bungalow
Year Built
1922

Materials

Construction Materials
Block, Stucco, Frame
Roof
Composition

Terms

Terms

Ownership
Agent Owner
Special Terms
Cash, Conventional

Taxes

Tax

Tax (Annual)
$14,768

Heating, Cooling & Utilities

Cooling Features
Air Conditioning-Room

Utilities

Utilities
Electricity Available, Natural Gas Available
Sewer
Public Sewer
Water Source
Public

Lot

Acres
0.10
Lot Size Area Sq Ft
4,472
Lot Features
Rolling Slope, Sprinklers In Front

Exterior Features

Exterior Features
Balcony
Patio And Porch Features
Deck, Patio

Parking

Total Parking Spaces
3
Garage Capacity
3
Listed by The Colorado Group, 3034492131
Listing Data last updated 10/12/2026 04:00 am
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Property History

Yesterday
Property information last updated
5 days ago
Date of last price change
38 days ago
Status Active. This is the date the listing was placed on market.
Cumulative Days on Market: 40 days (includes prior listings) · Currently listed since September 3, 2026. Data provided by the MLS.

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