1125 Maxwell Ave Immeuble residentiel 3 lots 2 260 498 € (753 499 €/Lot) Boulder, CO 80304

On historic Mapleton Hill, a 1922 bungalow pairs original Craftsman details with a rare three-car garage and studio, all zoned for single-family, duplex, or triplex use.
Built in 1922 for Mrs. Brilliant Allen, widow of a Boulder transfer-business owner, this Craftsman bungalow has passed through just four owning families in over a hundred years. Today it’s recognized as a contributing structure in Boulder’s Mapleton Hill Historic District, giving it street-level character without the restrictions of individual landmark status.
Original Douglas fir floors run through a classic bungalow layout: living and dining rooms wrapped around a covered front porch on tapered brick piers. A finished attic with skylights adds a bright, low-slung upper level, while the walk-out lower level holds a bedroom, three-quarter bath, and its own living room.
A fully equipped one-bedroom garden apartment opens to grade with a private entrance, full kitchen, and full bath, ready as a rental, in-law suite, or long-term tenant space. Out back, a detached three-car garage built in 2000 comes with a studio and half bath above, convertible to full living space under Boulder’s current ADU rules.
The current owner has updated every major system since 1998: electrical, plumbing, hot water heat, windows, and the roof. What hasn’t changed is the RMX-1 zoning, which puts single-family, duplex, or triplex use on the table across the property’s three structures, plus room for a home occupation like a licensed cottage food business.
The setting in the foothills of Sunshine Canyon, an 87 Walk Score, Ideal Market and North Boulder Park within a few blocks, the Mount Sanitas trailhead and Boulder Creek Path an easy bike ride away, and the landmark Charles Haertling-designed Boulder Eye Clinic next door.