Boulder County property record for 520 Concord Ave, Boulder, CO 80304
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1.5 ba · 1,628 sqft · built 1914 |
| Lot Size | 0.119 acres (5,165 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $177,000 (Nov 1986) |
| Tax Bill | $10,179 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1461-25-1-04-007 |
| Primary APN | 1461-25-1-04-007 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 7 Rooms |
| Stories | 2 Stories |
| Building Area | 1,628 sqft Living Area |
| Gross Area | 2,204 sqft |
| 1st Floor Area | 1,140 sqft |
| Upper Floors Area | 488 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1914 |
|---|---|
| Effective Year Built | Effective 1975 |
| Architectural Style | A-Frame |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 5,165 sqft (0.119 acres) |
| Garage Type | Attached |
| Garage Area | 576 sqft |
| Porch | Porch |
|---|---|
| Porch Area | 72 sqft |
| Deck Area | 177 sqft |
| Patio Area | 309 sqft |
| Total Buildings | 2 Buildings |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | R0008773 |
|---|---|
| Street Address | 520 CONCORD AVE |
| City | BOULDER |
| State | CO |
| Zip | 80304-3921 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 10 & E 12 1/2 FT LOT 11 BLK 13 MAXWELL |
| Legal Range | 71 |
| Legal Township | 1N |
| Legal Section | 25 |
| Legal Subdivision | MAXWELLS - BO |
| Legal Block | 13 |
| Legal Lot Number | 10 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 4 |
| Census Block | 4002 |
| Census Tract | 12101 |
Source: Boulder County records · APN 1461-25-1-04-007
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 | 520 CONCORD AVE, BOULDER, CO 80304-3921 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Nov 13, 1986 · Amount on Record |
| Deed Sale | Nov 13, 1986 · Amount on Record |
| Prior Sale | Sep 15, 1975 · Amount on Record |
| Deed Document Number | 1986804516 |
| Record Updated | Sep 20, 2026 |
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 and are not market price estimates.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $122,958 (+8.8%) Land $95,962 Building $26,996 | $1,808,200 (-) Land $1,411,200 Building $397,000 | |
| 2025 | $10,179.00 (+2.06%) | $113,013 (-10.22%) Land $88,200 Building $24,813 | $1,808,200 (-3.76%) Land $1,411,200 Building $397,000 |
| 2023 | $9,974.00 (+29.05%) | $125,880 (+39.58%) Land $96,031 Building $29,849 | $1,878,800 (+44.79%) Land $1,433,300 Building $445,500 |
| 2022 | $7,729.00 | $90,183 Land $62,029 Building $28,154 | $1,297,600 Land $892,500 Building $405,100 |
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 |
|---|---|
| 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 | Moderate above 68% of the US · above 62% of Colorado |
|---|---|
| Wildfire Likelihood | 0.3% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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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