Boulder County property record for 421 Highland Ave, Boulder, CO 80302
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3.25 ba · 4,100 sqft · built 1904 |
| Lot Size | 0.163 acres (7,109 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $3,750,000 (Apr 2023) |
| Tax Bill | $22,296 (2025) |
| Deeds & Mortgages | Apr 2023 Sale Apr 2021 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 1461-25-4-07-007 |
| Primary APN | 1461-25-4-07-007 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3.25 Baths |
| Half Baths | 2 Half Baths |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 4,100 sqft Living Area |
| Gross Area | 4,197 sqft |
| 1st Floor Area | 1,652 sqft |
| Upper Floors Area | 1,570 sqft |
| Basement Area | 975 sqft |
| Finished Basement | 878 sqft |
| Unfinished Basement | 97 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1904 |
|---|---|
| Effective Year Built | Effective 2000 |
| Architectural Style | Multi-Level |
| Exterior Material | Combination |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 7,109 sqft (0.163 acres) |
| Garage Type | Detached |
| Garage Area | 340 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Porch |
|---|---|
| Porch Area | 173 sqft |
| Deck Area | 388 sqft |
| Total Buildings | 2 Buildings |
| Cooling System | Central |
|---|---|
| Heating System | Hot Water |
| Account Number | R0002415 |
|---|---|
| Street Address | 421 HIGHLAND AVE |
| City | BOULDER |
| State | CO |
| Zip | 80302-4717 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOTS 35-36 BLK 5 MAPLETON |
| Legal Range | 71 |
| Legal Township | 1N |
| Legal Section | 25 |
| Legal Subdivision | MAPLETON - BO |
| Legal Block | 5 |
| Legal Lot Number | 35 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 4 |
| Census Block | 4013 |
| Census Tract | 12101 |
Source: Boulder County records · APN 1461-25-4-07-007
Assessment roll updated June 15, 2026 · Last verified June 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 421 HIGHLAND AVE, BOULDER, CO 80302-4717 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Date | Document |
|---|---|
| Apr 24, 2023 | Warranty Deed, Transfer HERITAGE TITLE COMPANY, HERITAGE TITLE CO |
| Apr 14, 2021 | Warranty Deed, Transfer FIDELITY NATIONAL TITLE |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Apr 24, 2023 · Amount on Record |
| Deed Sale | Apr 24, 2023 · Amount on Record |
| Prior Sale | Apr 14, 2021 · Amount on Record |
| Deed Document Number | 20234004788 |
| Record Updated | Sep 20, 2026 |
| Document Type | Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Apr 24, 2023 |
| Property Address | 421 HIGHLAND AVE, BOULDER, CO 80302-4717 |
| Document Number | 0004004788 |
| Instrument Date | Apr 17, 2023 |
| Instrument | 4004788 |
| Transaction Type | Transfer |
| Record Updated | May 02, 2023 |
| Title Company | HERITAGE TITLE COMPANY, HERITAGE TITLE CO |
| Amount | Amount Recorded |
|---|---|
| Tax | $375.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 421 HIGHLAND AVE, BOULDER, CO 80302-4717 |
| Document Type | Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Apr 14, 2021 |
| Property Address | 421 HIGHLAND AVE, BOULDER, CO 80302-4717 |
| Document Number | 0003876765 |
| Instrument Date | Apr 12, 2021 |
| Instrument | 3876765 |
| Transaction Type | Transfer |
| Record Updated | Sep 17, 2021 |
| Title Company | FIDELITY NATIONAL TITLE |
| Amount | Amount Recorded |
|---|---|
| Tax | $399.50 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 421 HIGHLAND AVE, BOULDER, CO 80302-4717 |
Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified June 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Municipality | Boulder City |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $253,490 (+8.8%) Land $112,764 Building $140,726 | $3,727,800 (-) Land $1,658,300 Building $2,069,500 | |
| 2025 | $22,296.00 (-7.37%) | $232,988 (-17.25%) Land $103,644 Building $129,344 | $3,727,800 (-11.29%) Land $1,658,300 Building $2,069,500 |
| 2023 | $24,071.00 (-0.44%) | $281,554 (+8.48%) Land $110,021 Building $171,533 | $4,202,300 (+12.53%) Land $1,642,100 Building $2,560,200 |
| 2022 | $24,177.00 | $259,548 Land $80,175 Building $179,373 | $3,734,500 Land $1,153,600 Building $2,580,900 |
Source: FEMA National Flood Hazard Layer as of October 14, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone A, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 15 units insured incl. 9 condo units |
| Nearby Flood Claims | 2 (2013) |
| Most Recent Claim | Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides |
| Wildfire Risk | High above 82% of the US · above 85% of Colorado |
|---|---|
| Wildfire Likelihood | 0.8% annual chance |
| Exposure | Direct burnable vegetation at the parcel |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Fixed Wireless | 2,500 / 2,500 |
| Lumen Technologies Fiber · DSL in parts of the area | 2,000 / 1,000 |
| Xfinity Cable | 2,000 / 250 |
| Live Wire Networks Fixed Wireless | 250 / 100 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: Verizon.
Based on FCC filings for 684 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | CITY OF BOULDER serves 166,080 people |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Sep 2024 |
| Lead | 2 ppb (2023–2025) action level 15 ppb |
| Water Quality | Haloacetic acids resolved · Jul 2017 |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 1 last 3 years |
Results are for the whole water system as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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