Boulder County property record for 423 5th Ave, #5B, Lyons, CO 80540 · Last verified June 2026
| Property Type | Condominium |
|---|---|
| Details | 2 bd · 2.5 ba · 1,121 sqft · built 2007 |
| Lot Size | 1.09 acres (47,712 sqft) |
| Owner | Company Name on File |
| Tax Bill | $5,227 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 1203-18-4-68-005 |
| Primary APN | 1203-18-4-68-005 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 5 Rooms |
| Building Area | 1,121 sqft Living Area |
| Gross Area | 1,317 sqft |
| 1st Floor Area | 471 sqft |
| Upper Floors Area | 650 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 2007 |
|---|---|
| Effective Year Built | Effective 2007 |
| Architectural Style | Condo/Apartment |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 47,712 sqft |
| Garage Type | Attached |
| Garage Area | 196 sqft |
| Porch | Porch |
| Porch Area | 72 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0516034 |
|---|---|
| Street Address | 423 5TH AVE, 5B |
| City | LYONS |
| State | CO |
| Zip | 80540-8835 |
| Property Category | Residential |
| Property Type | Residential > Condominium / Townhouse > Condominium |
| Legal Description | UNIT 5 BLDG B RIVER CLIFF COTTAGES CONDOMINIUMS |
| Legal Range | 70 |
| Legal Township | 3N |
| Legal Section | 18 |
| Legal Subdivision | RIVER CLIFF COTTAGES CONDOMINIUMS |
| Legal Block | 2 |
| Legal Unit | 5 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | LONGMONT |
| Census Block Group | 2 |
| Census Block | 2037 |
| Census Tract | 13601 |
Source: Boulder County records · APN 1203-18-4-68-005
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 | Company Name on File |
|---|---|
| Mailing Address | 3663 4TH ST, BOULDER, CO 80304-1705 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | Verified Name on Deed |
|---|---|
| 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 | Lyons Town |
| Unified School District | St. Vrain Valley School District RE 1J (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 | $41,800 (+8.8%) Building $41,800 | $614,700 (-) Building $614,700 | |
| 2025 | $5,227.00 (+12.48%) | $38,419 (-11.27%) Building $38,419 | $614,700 (-4.89%) Building $614,700 |
| 2023 | $4,647.00 (+29.19%) | $43,301 (+48.38%) Building $43,301 | $646,279 (+53.91%) Building $646,279 |
| 2022 | $3,597.00 | $29,183 Building $29,183 | $419,900 Building $419,900 |
Source: FEMA National Flood Hazard Layer, Boulder County (08013C), updated October 14, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 080130136012, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Special Flood Hazard Area | No |
| Flood Hazard | Moderate |
| 500-Year Floodplain | Yes |
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| Flood Insurance Cost | Premium on Record median of 22 individual NFIP policies nearby |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 22 in force |
| Nearby Flood Claims | 56 (1980–2015) |
| Claims Outside the SFHA | 23 of 56 |
| Most Recent Claim | Jun 2015, rainfall accumulation, Severe Storms, Tornadoes, Flooding, Landslides, And Mudslides |
| Claims By Storm |
|
| Wildfire Risk | High above 76% of the US · above 75% of Colorado |
|---|---|
| Wildfire Likelihood | About 1 in 291 per year |
| Exposure | Indirect within ember reach |
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, availability as of December 31, 2025 · Published October 2026 · based on 275 locations within about half a mile of this property
| Provider | Technology | Download / Upload (Mbps) | Low Latency |
|---|---|---|---|
| Z3N | Fiber | 1,000 / 1,000 | Yes |
| Z3N | Cable | 1,000 / 100 | Yes |
| Verizon | Fixed Wireless | 300 / 20 | Yes |
| Z3N | Fixed Wireless (unlicensed) | 200 / 30 | No |
| T-Mobile USA | Fixed Wireless | 100 / 20 | Yes |
| AT&T | Fixed Wireless | 100 / 20 | Yes |
| JAB Wireless | Fixed Wireless (unlicensed) | 100 / 20 | Yes |
Availability varies by address; speeds are provider-advertised maximums, not measured.
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