Public Remarks: Lush, secluded site on the very west of Baseline-small private road right across from beautiful Chautauqua Park. Enjoy spectacular, up close Flatiron views from this mid-century modern home. Period architectural details with paneled, vaulted and beamed ceilings, retro kitchen, walls of glass, 3 fireplaces (gas) and over 4100 sq ft to work with. Sprawling ranch with a full walk-out lower level and several incredible outdoor living spaces. All original condition and ready for a top to bottom renovation. In its prime, the outdoor living spaces overlooked a forest of trees and flowering gardens with seasonal Gregory Creek flowing at the west edge of the property. 15,926 square foot lot at the base of Flagstaff Mountain. Big square footage ready for your 21st century redesign. Please contact listing agent for interior picture availability.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Public record
Public record
Zoning
Permits
Beds
4
Baths
2
Stories
1
Lot width
—
Lot depth
—
Lot size
0.37 Acres
Year renovated
1975
Sq. Ft.
3,632
Year built
1956
Style
Single Family Residential
County
Boulder County
APN
R0003177
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Sep 2, 2026.
RE
Residential-Estate District
Primarily single-family detached dwelling units with some duplexes and attached dwelling units at low to very low residential densities.
Permitted uses
Include but are not limited to:
Religious facility
Housing-Multiple units
Educational/school
Recreation
Agriculture-Cropland
Park & open space
Jan 15, 2026 • Final
Single family detached dwelling - remodel
Remodel
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Parking
Parking Features
Covered Spaces: 2
Garage: Yes
Garage Spaces: 2
Interior
Bathroom Information
Bathrooms (Full): 1
Bathrooms (Half): 0
Bathrooms (Three Quarter): 2
Bedroom Information
Bedrooms Total: 5
Heating & Cooling
Cooling: Yes
Central Air
Heating: Yes
Forced Air
Interior Features
Electric Range/Oven, Dishwasher, Refrigerator, Bar Fridge, Washer, Dryer, Disposal
Fireplace: Yes
Fireplace Features: 2+ Fireplaces, Gas, Living Room, Primary Bedroom, Basement
Study Area
Room Information
Basement: Full, Walk-Out Access
Exterior
Exterior Features
Balcony
Patio and Porch Features: Enclosed
Roof: Composition
Lot Information
Horse(s): No
Lot Features: Cul-De-Sac, Wooded
Zoning: RES
Property Information
Property Type: Residential
View: Yes
Waterfront: No
Subdivision Information
Subdivision Name: Willowbrook
MLS Area Major: Boulder
Building Information
Above Grade Finished Area: 3895
Below Grade Finished Area: 0
Building Area Total: 3895
Construction Materials: Wood/Frame, Brick/Brick Veneer
Financial
Tax Information
Parcel Number: R0003177
Tax Annual Amount: 10656
Tax Year: 2022
Financial Information
Listing Terms: Cash, Conventional
Utilities
Utility Information
Utilities: Natural Gas Available, Electricity Available
Electric: Electric,Xcel
Gas: Natural Gas,Xcel
Sewer: City Sewer
Location
HOA Information
Association: No
School Information
High School District: Boulder Valley Dist RE2
Elementary School: Flatirons
Middle or Junior School: Manhattan
High School: Boulder
Location Information
Unparsed Address: 421 Baseline Rd Boulder CO 80302
Street Number: 421
Street Name: Baseline
Street Suffix: Rd
City: Boulder
State or Province: CO
County or Parish: Boulder
Country: US
Postal Code: 80302
Coordinates: -105.28936,40.0002
Latitude: 40.0002
Longitude: -105.28936
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 3,632
Stories: 1.0
Lot Size: 0.37 acres
Style: Single Family Residential
Year Built: 1956
Year Renovated: 1975
County: Boulder County
APN: R0003177
Home facts updated by county records on Sep 2, 2026
Other
Listing Information
Attribution Contact: 3034497000
Close Price: $2,700,000
Photos Count: 17
Possible Use: Single Family
Special Listing Conditions: Private Owner
Standard Status: Closed
Listing Date Information
Close Date: Wednesday, June 28, 2023
Cumulative Days on Market: 115
Days on Market: 115
Listing Contract Date: Monday, March 6, 2023
Modification Timestamp: Friday, August 2, 2024 5:57 AM
Home Information
Window Features: Window Coverings
Year Built: 1956
Green Information
Green Energy Efficient: Southern Exposure
Around this home
Schools
Flatirons Elementary School
Public K-5 • Assigned • 0.6mi
8/10
Manhattan Middle School Of The Arts And Academics
Public 6-8 • Assigned • 3.2mi
9/10
Boulder High School
Public 9-12 • Assigned • 1.1mi
9/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
5/10 Fire Factor
6% chance of being in a wildfire in next 30 years
3/10 Heat Factor
8 days above 90° expected this year, 21 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
2/10 Air Factor
2 unhealthy days expected this year, 2 days in 30 years
Provided by First Street
Historical weather
Boulder, CO • 80302
Average low and high temperatures (°F)
37
18
45
25
54
34
54
34
60
41
74
53
80
59
78
58
73
51
62
42
49
32
47
30
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 10.5 hours in
June and 6 hours in December, placing it above the
U.S. average for solar exposure.
10.5 hrs
6 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$2.68M – $3.24M
Reach more buyers when you sell with Redfin. Save up to $28,185 in fees.3 minutes to get started.