Two Mid-Century Modern Homes on One Lot near Downtown Boulder. Rarely does a property like this come to market in one of Boulder's most sought-after neighborhoods. Located near 4th & Marine, this legal non-conforming duplex features two separate mid-century modern homes on one lot, each with 2 bedrooms, 1 bathroom, built-in storage, and walls of natural light. The front house was built in 1946 and the back house was constructed in 1960. A shared courtyard connects the homes providing both covered and open patio space with opportunities for gardening, entertaining, or future additions. Inside, each home was designed with comfortable living in mind, offering smart layouts, storage solutions, and timeless mid-century character. Additional features include a shared laundry room and easy access to Boulder's best amenities. Just blocks from Downtown Boulder, Boulder Creek, and Eben G. Fine Park, the location combines convenience with a peaceful residential feel. With multiple paths forward-income property, multi-generational living, owner-occupant with rental, or full renovation and expansion-this property offers unparalleled flexibility and long-term potential in a prime Boulder location.
Sold for $1,411,000
$1,411,000
1625 4th St, Boulder, CO 80302
4beds
1,897sqft
Mixed Use
Built in 1960
5,335 Square Feet Lot
$1,401,400 Zestimate®
$744/sqft
$4,848 Estimated rent
Home value
$1,401,400
$1.30M - $1.50M
$4,848/mo
Zestimate® history
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Zillow last checked:
Listing updated:
Listed by:
Autumn White 206-851-7998,
Compass - Boulder
Bought with:
Jennifer Egbert, 40034853
milehimodern - Boulder
Source: IRES as distributed by MLS GRID,MLS#: 1049877
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 2
- Full bathrooms: 2
- Main level bathrooms: 2
Primary bedroom
- Description: Wood
- Features: Shared Primary Bath
- Level: Main
- Area: 150 Square Feet
- Dimensions: 10 x 15
Bedroom 2
- Level: Main
- Area: 126 Square Feet
- Dimensions: 14 x 9
Bedroom 3
- Level: Main
- Area: 81 Square Feet
- Dimensions: 9 x 9
Bedroom 4
- Level: Main
- Area: 99 Square Feet
- Dimensions: 11 x 9
Dining room
- Level: Main
- Area: 408 Square Feet
- Dimensions: 24 x 17
Kitchen
- Description: Wood
- Level: Main
- Area: 154 Square Feet
- Dimensions: 14 x 11
Laundry
- Level: Main
- Area: 54 Square Feet
- Dimensions: 6 x 9
Living room
- Level: Main
- Area: 143 Square Feet
- Dimensions: 11 x 13
Study
- Level: Main
- Area: 56 Square Feet
- Dimensions: 8 x 7
Heating
- Forced Air, Hot Water, Baseboard
Cooling
- Whole House Fan
Appliances
- Included: Electric Range, Dishwasher, Refrigerator, Washer, Dryer, Microwave, Disposal
- Laundry: Washer/Dryer Hookup
Features
- Eat-in Kitchen, Kitchen Island
- Flooring: Wood
- Windows: Window Coverings
- Basement: None
Interior area
- Total structure area: 1,897
- Total interior livable area: 1,897 sqft
- Finished area above ground: 1,897
Property
Parking
- Parking features: None
- Details: None
Features
- Levels: One
- Stories: 1
- Patio & porch: Patio, Enclosed
- Fencing: Partial,Fenced,Metal,Vinyl
Lot
- Size: 5,335 sqft
- Features: Level, Paved, Curbs, Gutters, Sidewalks, Fire Hydrant within 500 Feet
Details
- Parcel number: R0001009
- Zoning: RES
- Special conditions: Private Owner
Construction
Type & style
- Home type: SingleFamily
- Property subtype: Mixed Use
Materials
- Frame
- Roof: Composition
Condition
- New construction: No
- Year built: 1960
Utilities & green energy
- Sewer: Public Sewer
- Water: City
- Utilities for property: Natural Gas Available, Electricity Available
Community & neighborhood
Security
- Security features: Fire Alarm
Location
- Region: Boulder
- Subdivision: Flatirons
Other
Other facts
- Listing terms: Cash,Conventional
- Road surface type: Asphalt
Price history
| Date | Event | Price |
|---|---|---|
| 2/20/2026 | Sold | $1,411,000$744/sqft |
Source:  IRES as distributed by MLS GRID #1049877 Report a problem | ||
| 2/3/2026 | Listed for sale | $1,411,000$744/sqft |
Source: IRES as distributed by MLS GRID #1049877 Report a problem | ||
| 1/25/2026 | Pending sale | $1,411,000$744/sqft |
Source:  REcolorado as distributed by MLS GRID #IR1049877 Report a problem | ||
| 1/20/2026 | Listed for sale | $1,411,000+182.2%$744/sqft |
Source: IRES as distributed by MLS GRID #1049877 Report a problem | ||
| 4/12/2021 | Listing removed | -- |
Source: Zillow Rental Manager Report a problem | ||
| 3/30/2021 | Listed for rent | $2,000$1/sqft |
Source: Zillow Rental Manager Report a problem | ||
| 10/23/2019 | Listing removed | $2,000$1/sqft |
Source: Owner Report a problem | ||
| 10/8/2019 | Listed for rent | $2,000$1/sqft |
Source: Owner Report a problem | ||
| 7/1/2003 | Sold | $500,000$264/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $7,327 +1.8% | $80,882 -5.1% |
| 2024 | $7,195 +11.7% | $85,257 -1% |
| 2023 | $6,441 +4.8% | $86,084 +27.1% |
| 2022 | $6,149 +4.6% | $67,749 -2.8% |
| 2021 | $5,881 | $69,698 +3.2% |
| 2020 | $5,881 +11.5% | $67,568 |
| 2019 | $5,275 | $67,568 +11.1% |
| 2018 | $5,275 | $60,840 -9.5% |
| 2017 | $5,275 +18.2% | $67,261 +30.4% |
| 2016 | $4,464 +5.6% | $51,565 +12.4% |
| 2015 | $4,227 +9.6% | $45,882 |
| 2014 | $3,858 -1.4% | $45,882 |
| 2013 | $3,914 +0.9% | $45,882 -1.8% |
| 2012 | $3,880 -4% | $46,725 |
| 2011 | $4,040 +7.1% | -- |
| 2010 | $3,772 +2.4% | $49,980 |
| 2009 | $3,684 +3.5% | $49,980 -13.2% |
| 2008 | $3,558 +25.3% | $57,580 +24.8% |
| 2006 | $2,839 +31.7% | $46,140 |
| 2005 | $2,155 +0.7% | $46,140 +30.8% |
| 2004 | $2,140 -0.5% | $35,280 |
| 2003 | $2,151 +10.3% | $35,280 +14.4% |
| 2002 | $1,949 | $30,830 |
Find assessor info on the county website
Neighborhood: Flatirons
Nearby schools
GreatSchools rating
- 6/10Flatirons Elementary SchoolGrades: K-5Distance: 0.5 mi
- 5/10Manhattan Middle School Of The Arts And AcademicsGrades: 6-8Distance: 3.5 mi
- 10/10Boulder High SchoolGrades: 9-12Distance: 0.8 mi
Schools provided by the listing agent
- Elementary: Flatirons
- Middle: Manhattan
- High: Boulder
Source: IRES as distributed by MLS GRID. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
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Estimated market value
$1,401,400
Get a cash offer in 3 minutes
Find out how much your home could sell for in as little as 3 minutes with a no-obligation cash offer.
Estimated market value
$1,401,400
- Colorado
- Boulder County
- Boulder
- 80302
- Flatirons
- 1625 4th St
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