435 Prospect St, Lyons, CO 80540 Property Records

Boulder County property record for 435 Prospect St, Lyons, CO 80540 · Last verified June 2026

Property Highlights

Property Type	Residential > Single Family > Home
Bedrooms	2 Beds
Bathrooms	1 Baths
Architecture Style	Ranch
Year Built	Built 1987
Square Footage	864 sqft Living Area
Lot Size	4,832 sqft (0.111 acres)
Last Sale	$15,000 (1986)
Tax Bill	$4,606.00 (2025)

Property Details

APN / Parcel Number

Primary APN	`1203-18-4-33-004`
Alternative APNs	`R0050177` `0050177`

Interior

Bedrooms	2 Beds
Full Baths	1 Baths
Total Rooms	4 Rooms
Building Area	864 sqft Living Area
1st Floor	864 sqft 1st Floor
Stories	1 Stories
Interior Structure	Wallboard/Drywall Interior Structure

Exterior

Year Built	Built 1987
Effective Year Built	Effective 1987
Architectural Style	Ranch Style
Exterior Material	Wood Shingle Exterior
Construction Type	Frame Construction
Lot Area	4,832 sqft (0.111 acres)

Utilities and HVAC

Heating System	Forced Air with Air Conditioning Heating

Location & Zoning

Account Number	R0050177
Street Address	435 PROSPECT ST
City	LYONS
State	CO
Zip	80540
Property Usage	Residential Property Usage
Type	Residential > Single Family > Home
Legal Description	E 35 FT LOT 5 BLK 35 LYONS MH ID 8724771
Legal Range	70
Legal Township	3N
Legal Section	18
Legal Subdivision	LYONS - LY
Legal Block	35
Legal Lot Number	5
Jurisdiction	BOULDER CO
Minor Civil Division	LONGMONT
Census Blockgroup	3
Census Block	3027
Census Tract	13601

Owner

Source: Boulder County records · APN 1203-18-4-33-004

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	PO BOX 614, LYONS, CO 80540-0614
Owner Type	Owner is an Individual, Couple or Unincorporated Entity
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	Sep 16, 1986 · Amount on Record
Deed Sale	Sep 16, 1986 · Amount on Record
Prior Sale	Sep 15, 1986
Deed Doc Number	1986789468
Last Transfer Date	Mar 10, 2011
Transfer Doc	0003137587
Record Refreshed	Sep 20, 2026

Tax Assessment & Valuation

Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified June 2026

Property Jurisdictions

Type	Name
State	Colorado
County	Boulder County
Municipality	Lyons Town
Unified School District	St. Vrain Valley School District RE 1J (PK - 12)

Tax Bill & Assessment History

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		$36,835 (+8.8%) Land $3,665 Building $33,170	$541,700 (-) Land $53,900 Building $487,800
2025	$4,606.00 (+48.39%)	$33,857 (+12.3%) Land $3,369 Building $30,488	$541,700 (+20.38%) Land $53,900 Building $487,800
2023	$3,104.00 (-10.29%)	$30,150 (+7.41%) Land $3,129 Building $27,021	$450,000 (+11.41%) Land $46,700 Building $403,300
2022	$3,460.00	$28,071 Land $2,863 Building $25,208	$403,900 Land $41,200 Building $362,700

Flood & Wildfire

435 Prospect St is in FEMA Zone AE, inside the Special Flood Hazard Area, with indirect wildfire exposure (High risk).

Flood

Source: FEMA National Flood Hazard Layer · Boulder County (08013C), updated October 14, 2026

FEMA Flood Zone	Zone AE 1% annual chance, base flood elevation determined
Special Flood Hazard Area	Yes flood insurance required for federally backed mortgages
Floodway	No
Base Flood Elevation	Varies along the reach; see FIRM

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020

Wildfire Risk to Homes	High 79th percentile of exposed land nationally · 81st in Colorado
Wildfire Likelihood	High — about 1 in 224 per year
Exposure	Indirect within ember reach of burnable land

Values are read at the parcel center point; lenders make the official flood determination.